xref: /freebsd/sys/net80211/ieee80211_hostap.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
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 HOSTAP 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_hostap.h>
59 #include <net80211/ieee80211_input.h>
60 #include <net80211/ieee80211_wds.h>
61 
62 #define	IEEE80211_RATE2MBS(r)	(((r) & IEEE80211_RATE_VAL) / 2)
63 
64 static	void hostap_vattach(struct ieee80211vap *);
65 static	int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
66 static	int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
67 	    int rssi, int noise, uint32_t rstamp);
68 static void hostap_deliver_data(struct ieee80211vap *,
69 	    struct ieee80211_node *, struct mbuf *);
70 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
71 	    int subtype, int rssi, int noise, uint32_t rstamp);
72 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
73 
74 void
75 ieee80211_hostap_attach(struct ieee80211com *ic)
76 {
77 	ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
78 }
79 
80 void
81 ieee80211_hostap_detach(struct ieee80211com *ic)
82 {
83 }
84 
85 static void
86 hostap_vdetach(struct ieee80211vap *vap)
87 {
88 }
89 
90 static void
91 hostap_vattach(struct ieee80211vap *vap)
92 {
93 	vap->iv_newstate = hostap_newstate;
94 	vap->iv_input = hostap_input;
95 	vap->iv_recv_mgmt = hostap_recv_mgmt;
96 	vap->iv_opdetach = hostap_vdetach;
97 	vap->iv_deliver_data = hostap_deliver_data;
98 }
99 
100 static void
101 sta_disassoc(void *arg, struct ieee80211_node *ni)
102 {
103 	struct ieee80211vap *vap = arg;
104 
105 	if (ni->ni_vap == vap && ni->ni_associd != 0) {
106 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
107 			IEEE80211_REASON_ASSOC_LEAVE);
108 		ieee80211_node_leave(ni);
109 	}
110 }
111 
112 /*
113  * IEEE80211_M_HOSTAP vap state machine handler.
114  */
115 static int
116 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
117 {
118 	struct ieee80211com *ic = vap->iv_ic;
119 	enum ieee80211_state ostate;
120 
121 	IEEE80211_LOCK_ASSERT(ic);
122 
123 	ostate = vap->iv_state;
124 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
125 	    __func__, ieee80211_state_name[ostate],
126 	    ieee80211_state_name[nstate], arg);
127 	vap->iv_state = nstate;			/* state transition */
128 	if (ostate != IEEE80211_S_SCAN)
129 		ieee80211_cancel_scan(vap);	/* background scan */
130 	switch (nstate) {
131 	case IEEE80211_S_INIT:
132 		switch (ostate) {
133 		case IEEE80211_S_SCAN:
134 			ieee80211_cancel_scan(vap);
135 			break;
136 		case IEEE80211_S_CAC:
137 			ieee80211_dfs_cac_stop(vap);
138 			break;
139 		case IEEE80211_S_RUN:
140 			ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
141 			break;
142 		default:
143 			break;
144 		}
145 		if (ostate != IEEE80211_S_INIT) {
146 			/* NB: optimize INIT -> INIT case */
147 			ieee80211_reset_bss(vap);
148 		}
149 		if (vap->iv_auth->ia_detach != NULL)
150 			vap->iv_auth->ia_detach(vap);
151 		break;
152 	case IEEE80211_S_SCAN:
153 		switch (ostate) {
154 		case IEEE80211_S_CSA:
155 		case IEEE80211_S_RUN:
156 			ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
157 			/*
158 			 * Clear overlapping BSS state; the beacon frame
159 			 * will be reconstructed on transition to the RUN
160 			 * state and the timeout routines check if the flag
161 			 * is set before doing anything so this is sufficient.
162 			 */
163 			ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
164 			ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR;
165 			/* fall thru... */
166 		case IEEE80211_S_CAC:
167 			/*
168 			 * NB: We may get here because of a manual channel
169 			 *     change in which case we need to stop CAC
170 			 * XXX no need to stop if ostate RUN but it's ok
171 			 */
172 			ieee80211_dfs_cac_stop(vap);
173 			/* fall thru... */
174 		case IEEE80211_S_INIT:
175 			if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
176 			    !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
177 				/*
178 				 * Already have a channel; bypass the
179 				 * scan and startup immediately.
180 				 * ieee80211_create_ibss will call back to
181 				 * move us to RUN state.
182 				 */
183 				ieee80211_create_ibss(vap, vap->iv_des_chan);
184 				break;
185 			}
186 			/*
187 			 * Initiate a scan.  We can come here as a result
188 			 * of an IEEE80211_IOC_SCAN_REQ too in which case
189 			 * the vap will be marked with IEEE80211_FEXT_SCANREQ
190 			 * and the scan request parameters will be present
191 			 * in iv_scanreq.  Otherwise we do the default.
192 			 */
193 			if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
194 				ieee80211_check_scan(vap,
195 				    vap->iv_scanreq_flags,
196 				    vap->iv_scanreq_duration,
197 				    vap->iv_scanreq_mindwell,
198 				    vap->iv_scanreq_maxdwell,
199 				    vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
200 				vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
201 			} else
202 				ieee80211_check_scan_current(vap);
203 			break;
204 		case IEEE80211_S_SCAN:
205 			/*
206 			 * A state change requires a reset; scan.
207 			 */
208 			ieee80211_check_scan_current(vap);
209 			break;
210 		default:
211 			break;
212 		}
213 		break;
214 	case IEEE80211_S_CAC:
215 		/*
216 		 * Start CAC on a DFS channel.  We come here when starting
217 		 * a bss on a DFS channel (see ieee80211_create_ibss).
218 		 */
219 		ieee80211_dfs_cac_start(vap);
220 		break;
221 	case IEEE80211_S_RUN:
222 		if (vap->iv_flags & IEEE80211_F_WPA) {
223 			/* XXX validate prerequisites */
224 		}
225 		switch (ostate) {
226 		case IEEE80211_S_INIT:
227 			/*
228 			 * Already have a channel; bypass the
229 			 * scan and startup immediately.
230 			 * Note that ieee80211_create_ibss will call
231 			 * back to do a RUN->RUN state change.
232 			 */
233 			ieee80211_create_ibss(vap,
234 			    ieee80211_ht_adjust_channel(ic,
235 				ic->ic_curchan, vap->iv_flags_ext));
236 			/* NB: iv_bss is changed on return */
237 			break;
238 		case IEEE80211_S_CAC:
239 			/*
240 			 * NB: This is the normal state change when CAC
241 			 * expires and no radar was detected; no need to
242 			 * clear the CAC timer as it's already expired.
243 			 */
244 			/* fall thru... */
245 		case IEEE80211_S_CSA:
246 			/*
247 			 * Update bss node channel to reflect where
248 			 * we landed after CSA.
249 			 */
250 			ieee80211_node_set_chan(vap->iv_bss,
251 			    ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
252 				ieee80211_htchanflags(vap->iv_bss->ni_chan)));
253 			/* XXX bypass debug msgs */
254 			break;
255 		case IEEE80211_S_SCAN:
256 		case IEEE80211_S_RUN:
257 #ifdef IEEE80211_DEBUG
258 			if (ieee80211_msg_debug(vap)) {
259 				struct ieee80211_node *ni = vap->iv_bss;
260 				ieee80211_note(vap,
261 				    "synchronized with %s ssid ",
262 				    ether_sprintf(ni->ni_bssid));
263 				ieee80211_print_essid(ni->ni_essid,
264 				    ni->ni_esslen);
265 				/* XXX MCS/HT */
266 				printf(" channel %d start %uMb\n",
267 				    ieee80211_chan2ieee(ic, ic->ic_curchan),
268 				    IEEE80211_RATE2MBS(ni->ni_txrate));
269 			}
270 #endif
271 			break;
272 		default:
273 			break;
274 		}
275 		/*
276 		 * Start/stop the authenticator.  We delay until here
277 		 * to allow configuration to happen out of order.
278 		 */
279 		if (vap->iv_auth->ia_attach != NULL) {
280 			/* XXX check failure */
281 			vap->iv_auth->ia_attach(vap);
282 		} else if (vap->iv_auth->ia_detach != NULL) {
283 			vap->iv_auth->ia_detach(vap);
284 		}
285 		ieee80211_node_authorize(vap->iv_bss);
286 		break;
287 	default:
288 		break;
289 	}
290 	return 0;
291 }
292 
293 static void
294 hostap_deliver_data(struct ieee80211vap *vap,
295 	struct ieee80211_node *ni, struct mbuf *m)
296 {
297 	struct ether_header *eh = mtod(m, struct ether_header *);
298 	struct ifnet *ifp = vap->iv_ifp;
299 
300 	KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
301 	    ("gack, opmode %d", vap->iv_opmode));
302 	/*
303 	 * Do accounting.
304 	 */
305 	ifp->if_ipackets++;
306 	IEEE80211_NODE_STAT(ni, rx_data);
307 	IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
308 	if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
309 		m->m_flags |= M_MCAST;		/* XXX M_BCAST? */
310 		IEEE80211_NODE_STAT(ni, rx_mcast);
311 	} else
312 		IEEE80211_NODE_STAT(ni, rx_ucast);
313 
314 	/* clear driver/net80211 flags before passing up */
315 	m->m_flags &= ~M_80211_RX;
316 
317 	/* perform as a bridge within the AP */
318 	if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
319 		struct mbuf *mcopy = NULL;
320 
321 		if (m->m_flags & M_MCAST) {
322 			mcopy = m_dup(m, M_DONTWAIT);
323 			if (mcopy == NULL)
324 				ifp->if_oerrors++;
325 			else
326 				mcopy->m_flags |= M_MCAST;
327 		} else {
328 			/*
329 			 * Check if the destination is associated with the
330 			 * same vap and authorized to receive traffic.
331 			 * Beware of traffic destined for the vap itself;
332 			 * sending it will not work; just let it be delivered
333 			 * normally.
334 			 */
335 			struct ieee80211_node *sta = ieee80211_find_vap_node(
336 			     &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
337 			if (sta != NULL) {
338 				if (ieee80211_node_is_authorized(sta)) {
339 					/*
340 					 * Beware of sending to ourself; this
341 					 * needs to happen via the normal
342 					 * input path.
343 					 */
344 					if (sta != vap->iv_bss) {
345 						mcopy = m;
346 						m = NULL;
347 					}
348 				} else {
349 					vap->iv_stats.is_rx_unauth++;
350 					IEEE80211_NODE_STAT(sta, rx_unauth);
351 				}
352 				ieee80211_free_node(sta);
353 			}
354 		}
355 		if (mcopy != NULL) {
356 			int len, err;
357 			len = mcopy->m_pkthdr.len;
358 			err = ifp->if_transmit(ifp, mcopy);
359 			if (err) {
360 				/* NB: IFQ_HANDOFF reclaims mcopy */
361 			} else {
362 				ifp->if_opackets++;
363 			}
364 		}
365 	}
366 	if (m != NULL) {
367 		/*
368 		 * Mark frame as coming from vap's interface.
369 		 */
370 		m->m_pkthdr.rcvif = ifp;
371 		if (m->m_flags & M_MCAST) {
372 			/*
373 			 * Spam DWDS vap's w/ multicast traffic.
374 			 */
375 			/* XXX only if dwds in use? */
376 			ieee80211_dwds_mcast(vap, m);
377 		}
378 		if (ni->ni_vlan != 0) {
379 			/* attach vlan tag */
380 			m->m_pkthdr.ether_vtag = ni->ni_vlan;
381 			m->m_flags |= M_VLANTAG;
382 		}
383 		ifp->if_input(ifp, m);
384 	}
385 }
386 
387 /*
388  * Decide if a received management frame should be
389  * printed when debugging is enabled.  This filters some
390  * of the less interesting frames that come frequently
391  * (e.g. beacons).
392  */
393 static __inline int
394 doprint(struct ieee80211vap *vap, int subtype)
395 {
396 	switch (subtype) {
397 	case IEEE80211_FC0_SUBTYPE_BEACON:
398 		return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
399 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
400 		return 0;
401 	}
402 	return 1;
403 }
404 
405 /*
406  * Process a received frame.  The node associated with the sender
407  * should be supplied.  If nothing was found in the node table then
408  * the caller is assumed to supply a reference to iv_bss instead.
409  * The RSSI and a timestamp are also supplied.  The RSSI data is used
410  * during AP scanning to select a AP to associate with; it can have
411  * any units so long as values have consistent units and higher values
412  * mean ``better signal''.  The receive timestamp is currently not used
413  * by the 802.11 layer.
414  */
415 static int
416 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
417 	int rssi, int noise, uint32_t rstamp)
418 {
419 #define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
420 #define	HAS_SEQ(type)	((type & 0x4) == 0)
421 	struct ieee80211vap *vap = ni->ni_vap;
422 	struct ieee80211com *ic = ni->ni_ic;
423 	struct ifnet *ifp = vap->iv_ifp;
424 	struct ieee80211_frame *wh;
425 	struct ieee80211_key *key;
426 	struct ether_header *eh;
427 	int hdrspace, need_tap;
428 	uint8_t dir, type, subtype, qos;
429 	uint8_t *bssid;
430 	uint16_t rxseq;
431 
432 	if (m->m_flags & M_AMPDU_MPDU) {
433 		/*
434 		 * Fastpath for A-MPDU reorder q resubmission.  Frames
435 		 * w/ M_AMPDU_MPDU marked have already passed through
436 		 * here but were received out of order and been held on
437 		 * the reorder queue.  When resubmitted they are marked
438 		 * with the M_AMPDU_MPDU flag and we can bypass most of
439 		 * the normal processing.
440 		 */
441 		wh = mtod(m, struct ieee80211_frame *);
442 		type = IEEE80211_FC0_TYPE_DATA;
443 		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
444 		subtype = IEEE80211_FC0_SUBTYPE_QOS;
445 		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
446 		goto resubmit_ampdu;
447 	}
448 
449 	KASSERT(ni != NULL, ("null node"));
450 	ni->ni_inact = ni->ni_inact_reload;
451 
452 	need_tap = 1;			/* mbuf need to be tapped. */
453 	type = -1;			/* undefined */
454 
455 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
456 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
457 		    ni->ni_macaddr, NULL,
458 		    "too short (1): len %u", m->m_pkthdr.len);
459 		vap->iv_stats.is_rx_tooshort++;
460 		goto out;
461 	}
462 	/*
463 	 * Bit of a cheat here, we use a pointer for a 3-address
464 	 * frame format but don't reference fields past outside
465 	 * ieee80211_frame_min w/o first validating the data is
466 	 * present.
467 	 */
468 	wh = mtod(m, struct ieee80211_frame *);
469 
470 	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
471 	    IEEE80211_FC0_VERSION_0) {
472 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
473 		    ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]);
474 		vap->iv_stats.is_rx_badversion++;
475 		goto err;
476 	}
477 
478 	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
479 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
480 	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
481 	if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
482 		if (dir != IEEE80211_FC1_DIR_NODS)
483 			bssid = wh->i_addr1;
484 		else if (type == IEEE80211_FC0_TYPE_CTL)
485 			bssid = wh->i_addr1;
486 		else {
487 			if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
488 				IEEE80211_DISCARD_MAC(vap,
489 				    IEEE80211_MSG_ANY, ni->ni_macaddr,
490 				    NULL, "too short (2): len %u",
491 				    m->m_pkthdr.len);
492 				vap->iv_stats.is_rx_tooshort++;
493 				goto out;
494 			}
495 			bssid = wh->i_addr3;
496 		}
497 		/*
498 		 * Validate the bssid.
499 		 */
500 		if (!(type == IEEE80211_FC0_TYPE_MGT &&
501 		      subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
502 		    !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
503 		    !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
504 			/* not interested in */
505 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
506 			    bssid, NULL, "%s", "not to bss");
507 			vap->iv_stats.is_rx_wrongbss++;
508 			goto out;
509 		}
510 
511 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
512 		ni->ni_noise = noise;
513 		ni->ni_rstamp = rstamp;
514 		if (HAS_SEQ(type)) {
515 			uint8_t tid = ieee80211_gettid(wh);
516 			if (IEEE80211_QOS_HAS_SEQ(wh) &&
517 			    TID_TO_WME_AC(tid) >= WME_AC_VI)
518 				ic->ic_wme.wme_hipri_traffic++;
519 			rxseq = le16toh(*(uint16_t *)wh->i_seq);
520 			if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
521 			    (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
522 			    SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
523 				/* duplicate, discard */
524 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
525 				    bssid, "duplicate",
526 				    "seqno <%u,%u> fragno <%u,%u> tid %u",
527 				    rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
528 				    ni->ni_rxseqs[tid] >>
529 					IEEE80211_SEQ_SEQ_SHIFT,
530 				    rxseq & IEEE80211_SEQ_FRAG_MASK,
531 				    ni->ni_rxseqs[tid] &
532 					IEEE80211_SEQ_FRAG_MASK,
533 				    tid);
534 				vap->iv_stats.is_rx_dup++;
535 				IEEE80211_NODE_STAT(ni, rx_dup);
536 				goto out;
537 			}
538 			ni->ni_rxseqs[tid] = rxseq;
539 		}
540 	}
541 
542 	switch (type) {
543 	case IEEE80211_FC0_TYPE_DATA:
544 		hdrspace = ieee80211_hdrspace(ic, wh);
545 		if (m->m_len < hdrspace &&
546 		    (m = m_pullup(m, hdrspace)) == NULL) {
547 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
548 			    ni->ni_macaddr, NULL,
549 			    "data too short: expecting %u", hdrspace);
550 			vap->iv_stats.is_rx_tooshort++;
551 			goto out;		/* XXX */
552 		}
553 		if (!(dir == IEEE80211_FC1_DIR_TODS ||
554 		     (dir == IEEE80211_FC1_DIR_DSTODS &&
555 		      (vap->iv_flags & IEEE80211_F_DWDS)))) {
556 			if (dir != IEEE80211_FC1_DIR_DSTODS) {
557 				IEEE80211_DISCARD(vap,
558 				    IEEE80211_MSG_INPUT, wh, "data",
559 				    "incorrect dir 0x%x", dir);
560 			} else {
561 				IEEE80211_DISCARD(vap,
562 				    IEEE80211_MSG_INPUT |
563 				    IEEE80211_MSG_WDS, wh,
564 				    "4-address data",
565 				    "%s", "DWDS not enabled");
566 			}
567 			vap->iv_stats.is_rx_wrongdir++;
568 			goto out;
569 		}
570 		/* check if source STA is associated */
571 		if (ni == vap->iv_bss) {
572 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
573 			    wh, "data", "%s", "unknown src");
574 			ieee80211_send_error(ni, wh->i_addr2,
575 			    IEEE80211_FC0_SUBTYPE_DEAUTH,
576 			    IEEE80211_REASON_NOT_AUTHED);
577 			vap->iv_stats.is_rx_notassoc++;
578 			goto err;
579 		}
580 		if (ni->ni_associd == 0) {
581 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
582 			    wh, "data", "%s", "unassoc src");
583 			IEEE80211_SEND_MGMT(ni,
584 			    IEEE80211_FC0_SUBTYPE_DISASSOC,
585 			    IEEE80211_REASON_NOT_ASSOCED);
586 			vap->iv_stats.is_rx_notassoc++;
587 			goto err;
588 		}
589 
590 		/*
591 		 * Check for power save state change.
592 		 * XXX out-of-order A-MPDU frames?
593 		 */
594 		if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
595 		    (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
596 			ieee80211_node_pwrsave(ni,
597 				wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
598 		/*
599 		 * For 4-address packets handle WDS discovery
600 		 * notifications.  Once a WDS link is setup frames
601 		 * are just delivered to the WDS vap (see below).
602 		 */
603 		if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
604 			if (!ieee80211_node_is_authorized(ni)) {
605 				IEEE80211_DISCARD(vap,
606 				    IEEE80211_MSG_INPUT |
607 				    IEEE80211_MSG_WDS, wh,
608 				    "4-address data",
609 				    "%s", "unauthorized port");
610 				vap->iv_stats.is_rx_unauth++;
611 				IEEE80211_NODE_STAT(ni, rx_unauth);
612 				goto err;
613 			}
614 			ieee80211_dwds_discover(ni, m);
615 			return type;
616 		}
617 
618 		/*
619 		 * Handle A-MPDU re-ordering.  If the frame is to be
620 		 * processed directly then ieee80211_ampdu_reorder
621 		 * will return 0; otherwise it has consumed the mbuf
622 		 * and we should do nothing more with it.
623 		 */
624 		if ((m->m_flags & M_AMPDU) &&
625 		    ieee80211_ampdu_reorder(ni, m) != 0) {
626 			m = NULL;
627 			goto out;
628 		}
629 	resubmit_ampdu:
630 
631 		/*
632 		 * Handle privacy requirements.  Note that we
633 		 * must not be preempted from here until after
634 		 * we (potentially) call ieee80211_crypto_demic;
635 		 * otherwise we may violate assumptions in the
636 		 * crypto cipher modules used to do delayed update
637 		 * of replay sequence numbers.
638 		 */
639 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
640 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
641 				/*
642 				 * Discard encrypted frames when privacy is off.
643 				 */
644 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
645 				    wh, "WEP", "%s", "PRIVACY off");
646 				vap->iv_stats.is_rx_noprivacy++;
647 				IEEE80211_NODE_STAT(ni, rx_noprivacy);
648 				goto out;
649 			}
650 			key = ieee80211_crypto_decap(ni, m, hdrspace);
651 			if (key == NULL) {
652 				/* NB: stats+msgs handled in crypto_decap */
653 				IEEE80211_NODE_STAT(ni, rx_wepfail);
654 				goto out;
655 			}
656 			wh = mtod(m, struct ieee80211_frame *);
657 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
658 		} else {
659 			/* XXX M_WEP and IEEE80211_F_PRIVACY */
660 			key = NULL;
661 		}
662 
663 		/*
664 		 * Save QoS bits for use below--before we strip the header.
665 		 */
666 		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
667 			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
668 			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
669 			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
670 		} else
671 			qos = 0;
672 
673 		/*
674 		 * Next up, any fragmentation.
675 		 */
676 		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
677 			m = ieee80211_defrag(ni, m, hdrspace);
678 			if (m == NULL) {
679 				/* Fragment dropped or frame not complete yet */
680 				goto out;
681 			}
682 		}
683 		wh = NULL;		/* no longer valid, catch any uses */
684 
685 		/*
686 		 * Next strip any MSDU crypto bits.
687 		 */
688 		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
689 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
690 			    ni->ni_macaddr, "data", "%s", "demic error");
691 			vap->iv_stats.is_rx_demicfail++;
692 			IEEE80211_NODE_STAT(ni, rx_demicfail);
693 			goto out;
694 		}
695 		/* copy to listener after decrypt */
696 		if (bpf_peers_present(vap->iv_rawbpf))
697 			bpf_mtap(vap->iv_rawbpf, m);
698 		need_tap = 0;
699 		/*
700 		 * Finally, strip the 802.11 header.
701 		 */
702 		m = ieee80211_decap(vap, m, hdrspace);
703 		if (m == NULL) {
704 			/* XXX mask bit to check for both */
705 			/* don't count Null data frames as errors */
706 			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
707 			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
708 				goto out;
709 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
710 			    ni->ni_macaddr, "data", "%s", "decap error");
711 			vap->iv_stats.is_rx_decap++;
712 			IEEE80211_NODE_STAT(ni, rx_decap);
713 			goto err;
714 		}
715 		eh = mtod(m, struct ether_header *);
716 		if (!ieee80211_node_is_authorized(ni)) {
717 			/*
718 			 * Deny any non-PAE frames received prior to
719 			 * authorization.  For open/shared-key
720 			 * authentication the port is mark authorized
721 			 * after authentication completes.  For 802.1x
722 			 * the port is not marked authorized by the
723 			 * authenticator until the handshake has completed.
724 			 */
725 			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
726 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
727 				    eh->ether_shost, "data",
728 				    "unauthorized port: ether type 0x%x len %u",
729 				    eh->ether_type, m->m_pkthdr.len);
730 				vap->iv_stats.is_rx_unauth++;
731 				IEEE80211_NODE_STAT(ni, rx_unauth);
732 				goto err;
733 			}
734 		} else {
735 			/*
736 			 * When denying unencrypted frames, discard
737 			 * any non-PAE frames received without encryption.
738 			 */
739 			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
740 			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
741 			    eh->ether_type != htons(ETHERTYPE_PAE)) {
742 				/*
743 				 * Drop unencrypted frames.
744 				 */
745 				vap->iv_stats.is_rx_unencrypted++;
746 				IEEE80211_NODE_STAT(ni, rx_unencrypted);
747 				goto out;
748 			}
749 		}
750 		/* XXX require HT? */
751 		if (qos & IEEE80211_QOS_AMSDU) {
752 			m = ieee80211_decap_amsdu(ni, m);
753 			if (m == NULL)
754 				return IEEE80211_FC0_TYPE_DATA;
755 		} else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) &&
756 #define	FF_LLC_SIZE	(sizeof(struct ether_header) + sizeof(struct llc))
757 		    m->m_pkthdr.len >= 3*FF_LLC_SIZE) {
758 			struct llc *llc;
759 
760 			/*
761 			 * Check for fast-frame tunnel encapsulation.
762 			 */
763 			if (m->m_len < FF_LLC_SIZE &&
764 			    (m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
765 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
766 				    ni->ni_macaddr, "fast-frame",
767 				    "%s", "m_pullup(llc) failed");
768 				vap->iv_stats.is_rx_tooshort++;
769 				return IEEE80211_FC0_TYPE_DATA;
770 			}
771 			llc = (struct llc *)(mtod(m, uint8_t *) +
772 				sizeof(struct ether_header));
773 			if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) {
774 				m_adj(m, FF_LLC_SIZE);
775 				m = ieee80211_decap_fastframe(ni, m);
776 				if (m == NULL)
777 					return IEEE80211_FC0_TYPE_DATA;
778 			}
779 		}
780 #undef FF_LLC_SIZE
781 		if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
782 			ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
783 		else
784 			hostap_deliver_data(vap, ni, m);
785 		return IEEE80211_FC0_TYPE_DATA;
786 
787 	case IEEE80211_FC0_TYPE_MGT:
788 		vap->iv_stats.is_rx_mgmt++;
789 		IEEE80211_NODE_STAT(ni, rx_mgmt);
790 		if (dir != IEEE80211_FC1_DIR_NODS) {
791 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
792 			    wh, "mgt", "incorrect dir 0x%x", dir);
793 			vap->iv_stats.is_rx_wrongdir++;
794 			goto err;
795 		}
796 		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
797 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
798 			    ni->ni_macaddr, "mgt", "too short: len %u",
799 			    m->m_pkthdr.len);
800 			vap->iv_stats.is_rx_tooshort++;
801 			goto out;
802 		}
803 		if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
804 			/* ensure return frames are unicast */
805 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
806 			    wh, NULL, "source is multicast: %s",
807 			    ether_sprintf(wh->i_addr2));
808 			vap->iv_stats.is_rx_mgtdiscard++;	/* XXX stat */
809 			goto out;
810 		}
811 #ifdef IEEE80211_DEBUG
812 		if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
813 		    ieee80211_msg_dumppkts(vap)) {
814 			if_printf(ifp, "received %s from %s rssi %d\n",
815 			    ieee80211_mgt_subtype_name[subtype >>
816 				IEEE80211_FC0_SUBTYPE_SHIFT],
817 			    ether_sprintf(wh->i_addr2), rssi);
818 		}
819 #endif
820 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
821 			if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
822 				/*
823 				 * Only shared key auth frames with a challenge
824 				 * should be encrypted, discard all others.
825 				 */
826 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
827 				    wh, NULL,
828 				    "%s", "WEP set but not permitted");
829 				vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
830 				goto out;
831 			}
832 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
833 				/*
834 				 * Discard encrypted frames when privacy is off.
835 				 */
836 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
837 				    wh, NULL, "%s", "WEP set but PRIVACY off");
838 				vap->iv_stats.is_rx_noprivacy++;
839 				goto out;
840 			}
841 			hdrspace = ieee80211_hdrspace(ic, wh);
842 			key = ieee80211_crypto_decap(ni, m, hdrspace);
843 			if (key == NULL) {
844 				/* NB: stats+msgs handled in crypto_decap */
845 				goto out;
846 			}
847 			wh = mtod(m, struct ieee80211_frame *);
848 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
849 		}
850 		if (bpf_peers_present(vap->iv_rawbpf))
851 			bpf_mtap(vap->iv_rawbpf, m);
852 		vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp);
853 		m_freem(m);
854 		return IEEE80211_FC0_TYPE_MGT;
855 
856 	case IEEE80211_FC0_TYPE_CTL:
857 		vap->iv_stats.is_rx_ctl++;
858 		IEEE80211_NODE_STAT(ni, rx_ctrl);
859 		switch (subtype) {
860 		case IEEE80211_FC0_SUBTYPE_PS_POLL:
861 			hostap_recv_pspoll(ni, m);
862 			break;
863 		case IEEE80211_FC0_SUBTYPE_BAR:
864 			ieee80211_recv_bar(ni, m);
865 			break;
866 		}
867 		goto out;
868 	default:
869 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
870 		    wh, "bad", "frame type 0x%x", type);
871 		/* should not come here */
872 		break;
873 	}
874 err:
875 	ifp->if_ierrors++;
876 out:
877 	if (m != NULL) {
878 		if (bpf_peers_present(vap->iv_rawbpf) && need_tap)
879 			bpf_mtap(vap->iv_rawbpf, m);
880 		m_freem(m);
881 	}
882 	return type;
883 #undef SEQ_LEQ
884 }
885 
886 static void
887 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
888     int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status)
889 {
890 	struct ieee80211vap *vap = ni->ni_vap;
891 
892 	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
893 
894 	if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
895 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
896 		    ni->ni_macaddr, "open auth",
897 		    "bad sta auth mode %u", ni->ni_authmode);
898 		vap->iv_stats.is_rx_bad_auth++;	/* XXX */
899 		/*
900 		 * Clear any challenge text that may be there if
901 		 * a previous shared key auth failed and then an
902 		 * open auth is attempted.
903 		 */
904 		if (ni->ni_challenge != NULL) {
905 			free(ni->ni_challenge, M_80211_NODE);
906 			ni->ni_challenge = NULL;
907 		}
908 		/* XXX hack to workaround calling convention */
909 		ieee80211_send_error(ni, wh->i_addr2,
910 		    IEEE80211_FC0_SUBTYPE_AUTH,
911 		    (seq + 1) | (IEEE80211_STATUS_ALG<<16));
912 		return;
913 	}
914 	if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
915 		vap->iv_stats.is_rx_bad_auth++;
916 		return;
917 	}
918 	/* always accept open authentication requests */
919 	if (ni == vap->iv_bss) {
920 		ni = ieee80211_dup_bss(vap, wh->i_addr2);
921 		if (ni == NULL)
922 			return;
923 	} else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
924 		(void) ieee80211_ref_node(ni);
925 	/*
926 	 * Mark the node as referenced to reflect that it's
927 	 * reference count has been bumped to insure it remains
928 	 * after the transaction completes.
929 	 */
930 	ni->ni_flags |= IEEE80211_NODE_AREF;
931 	/*
932 	 * Mark the node as requiring a valid association id
933 	 * before outbound traffic is permitted.
934 	 */
935 	ni->ni_flags |= IEEE80211_NODE_ASSOCID;
936 
937 	if (vap->iv_acl != NULL &&
938 	    vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
939 		/*
940 		 * When the ACL policy is set to RADIUS we defer the
941 		 * authorization to a user agent.  Dispatch an event,
942 		 * a subsequent MLME call will decide the fate of the
943 		 * station.  If the user agent is not present then the
944 		 * node will be reclaimed due to inactivity.
945 		 */
946 		IEEE80211_NOTE_MAC(vap,
947 		    IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
948 		    "%s", "station authentication defered (radius acl)");
949 		ieee80211_notify_node_auth(ni);
950 	} else {
951 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
952 		IEEE80211_NOTE_MAC(vap,
953 		    IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
954 		    "%s", "station authenticated (open)");
955 		/*
956 		 * When 802.1x is not in use mark the port
957 		 * authorized at this point so traffic can flow.
958 		 */
959 		if (ni->ni_authmode != IEEE80211_AUTH_8021X)
960 			ieee80211_node_authorize(ni);
961 	}
962 }
963 
964 static void
965 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
966     uint8_t *frm, uint8_t *efrm, int rssi, int noise, uint32_t rstamp,
967     uint16_t seq, uint16_t status)
968 {
969 	struct ieee80211vap *vap = ni->ni_vap;
970 	uint8_t *challenge;
971 	int allocbs, estatus;
972 
973 	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
974 
975 	/*
976 	 * NB: this can happen as we allow pre-shared key
977 	 * authentication to be enabled w/o wep being turned
978 	 * on so that configuration of these can be done
979 	 * in any order.  It may be better to enforce the
980 	 * ordering in which case this check would just be
981 	 * for sanity/consistency.
982 	 */
983 	if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
984 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
985 		    ni->ni_macaddr, "shared key auth",
986 		    "%s", " PRIVACY is disabled");
987 		estatus = IEEE80211_STATUS_ALG;
988 		goto bad;
989 	}
990 	/*
991 	 * Pre-shared key authentication is evil; accept
992 	 * it only if explicitly configured (it is supported
993 	 * mainly for compatibility with clients like Mac OS X).
994 	 */
995 	if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
996 	    ni->ni_authmode != IEEE80211_AUTH_SHARED) {
997 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
998 		    ni->ni_macaddr, "shared key auth",
999 		    "bad sta auth mode %u", ni->ni_authmode);
1000 		vap->iv_stats.is_rx_bad_auth++;	/* XXX maybe a unique error? */
1001 		estatus = IEEE80211_STATUS_ALG;
1002 		goto bad;
1003 	}
1004 
1005 	challenge = NULL;
1006 	if (frm + 1 < efrm) {
1007 		if ((frm[1] + 2) > (efrm - frm)) {
1008 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1009 			    ni->ni_macaddr, "shared key auth",
1010 			    "ie %d/%d too long",
1011 			    frm[0], (frm[1] + 2) - (efrm - frm));
1012 			vap->iv_stats.is_rx_bad_auth++;
1013 			estatus = IEEE80211_STATUS_CHALLENGE;
1014 			goto bad;
1015 		}
1016 		if (*frm == IEEE80211_ELEMID_CHALLENGE)
1017 			challenge = frm;
1018 		frm += frm[1] + 2;
1019 	}
1020 	switch (seq) {
1021 	case IEEE80211_AUTH_SHARED_CHALLENGE:
1022 	case IEEE80211_AUTH_SHARED_RESPONSE:
1023 		if (challenge == NULL) {
1024 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1025 			    ni->ni_macaddr, "shared key auth",
1026 			    "%s", "no challenge");
1027 			vap->iv_stats.is_rx_bad_auth++;
1028 			estatus = IEEE80211_STATUS_CHALLENGE;
1029 			goto bad;
1030 		}
1031 		if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1032 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1033 			    ni->ni_macaddr, "shared key auth",
1034 			    "bad challenge len %d", challenge[1]);
1035 			vap->iv_stats.is_rx_bad_auth++;
1036 			estatus = IEEE80211_STATUS_CHALLENGE;
1037 			goto bad;
1038 		}
1039 	default:
1040 		break;
1041 	}
1042 	switch (seq) {
1043 	case IEEE80211_AUTH_SHARED_REQUEST:
1044 		if (ni == vap->iv_bss) {
1045 			ni = ieee80211_dup_bss(vap, wh->i_addr2);
1046 			if (ni == NULL) {
1047 				/* NB: no way to return an error */
1048 				return;
1049 			}
1050 			allocbs = 1;
1051 		} else {
1052 			if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1053 				(void) ieee80211_ref_node(ni);
1054 			allocbs = 0;
1055 		}
1056 		/*
1057 		 * Mark the node as referenced to reflect that it's
1058 		 * reference count has been bumped to insure it remains
1059 		 * after the transaction completes.
1060 		 */
1061 		ni->ni_flags |= IEEE80211_NODE_AREF;
1062 		/*
1063 		 * Mark the node as requiring a valid associatio id
1064 		 * before outbound traffic is permitted.
1065 		 */
1066 		ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1067 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1068 		ni->ni_noise = noise;
1069 		ni->ni_rstamp = rstamp;
1070 		if (!ieee80211_alloc_challenge(ni)) {
1071 			/* NB: don't return error so they rexmit */
1072 			return;
1073 		}
1074 		get_random_bytes(ni->ni_challenge,
1075 			IEEE80211_CHALLENGE_LEN);
1076 		IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1077 		    ni, "shared key %sauth request", allocbs ? "" : "re");
1078 		/*
1079 		 * When the ACL policy is set to RADIUS we defer the
1080 		 * authorization to a user agent.  Dispatch an event,
1081 		 * a subsequent MLME call will decide the fate of the
1082 		 * station.  If the user agent is not present then the
1083 		 * node will be reclaimed due to inactivity.
1084 		 */
1085 		if (vap->iv_acl != NULL &&
1086 		    vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1087 			IEEE80211_NOTE_MAC(vap,
1088 			    IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1089 			    ni->ni_macaddr,
1090 			    "%s", "station authentication defered (radius acl)");
1091 			ieee80211_notify_node_auth(ni);
1092 			return;
1093 		}
1094 		break;
1095 	case IEEE80211_AUTH_SHARED_RESPONSE:
1096 		if (ni == vap->iv_bss) {
1097 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1098 			    ni->ni_macaddr, "shared key response",
1099 			    "%s", "unknown station");
1100 			/* NB: don't send a response */
1101 			return;
1102 		}
1103 		if (ni->ni_challenge == NULL) {
1104 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1105 			    ni->ni_macaddr, "shared key response",
1106 			    "%s", "no challenge recorded");
1107 			vap->iv_stats.is_rx_bad_auth++;
1108 			estatus = IEEE80211_STATUS_CHALLENGE;
1109 			goto bad;
1110 		}
1111 		if (memcmp(ni->ni_challenge, &challenge[2],
1112 			   challenge[1]) != 0) {
1113 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1114 			    ni->ni_macaddr, "shared key response",
1115 			    "%s", "challenge mismatch");
1116 			vap->iv_stats.is_rx_auth_fail++;
1117 			estatus = IEEE80211_STATUS_CHALLENGE;
1118 			goto bad;
1119 		}
1120 		IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1121 		    ni, "%s", "station authenticated (shared key)");
1122 		ieee80211_node_authorize(ni);
1123 		break;
1124 	default:
1125 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1126 		    ni->ni_macaddr, "shared key auth",
1127 		    "bad seq %d", seq);
1128 		vap->iv_stats.is_rx_bad_auth++;
1129 		estatus = IEEE80211_STATUS_SEQUENCE;
1130 		goto bad;
1131 	}
1132 	IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1133 	return;
1134 bad:
1135 	/*
1136 	 * Send an error response; but only when operating as an AP.
1137 	 */
1138 	/* XXX hack to workaround calling convention */
1139 	ieee80211_send_error(ni, wh->i_addr2,
1140 	    IEEE80211_FC0_SUBTYPE_AUTH,
1141 	    (seq + 1) | (estatus<<16));
1142 }
1143 
1144 /*
1145  * Convert a WPA cipher selector OUI to an internal
1146  * cipher algorithm.  Where appropriate we also
1147  * record any key length.
1148  */
1149 static int
1150 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1151 {
1152 #define	WPA_SEL(x)	(((x)<<24)|WPA_OUI)
1153 	uint32_t w = LE_READ_4(sel);
1154 
1155 	switch (w) {
1156 	case WPA_SEL(WPA_CSE_NULL):
1157 		return IEEE80211_CIPHER_NONE;
1158 	case WPA_SEL(WPA_CSE_WEP40):
1159 		if (keylen)
1160 			*keylen = 40 / NBBY;
1161 		return IEEE80211_CIPHER_WEP;
1162 	case WPA_SEL(WPA_CSE_WEP104):
1163 		if (keylen)
1164 			*keylen = 104 / NBBY;
1165 		return IEEE80211_CIPHER_WEP;
1166 	case WPA_SEL(WPA_CSE_TKIP):
1167 		return IEEE80211_CIPHER_TKIP;
1168 	case WPA_SEL(WPA_CSE_CCMP):
1169 		return IEEE80211_CIPHER_AES_CCM;
1170 	}
1171 	return 32;		/* NB: so 1<< is discarded */
1172 #undef WPA_SEL
1173 }
1174 
1175 /*
1176  * Convert a WPA key management/authentication algorithm
1177  * to an internal code.
1178  */
1179 static int
1180 wpa_keymgmt(const uint8_t *sel)
1181 {
1182 #define	WPA_SEL(x)	(((x)<<24)|WPA_OUI)
1183 	uint32_t w = LE_READ_4(sel);
1184 
1185 	switch (w) {
1186 	case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1187 		return WPA_ASE_8021X_UNSPEC;
1188 	case WPA_SEL(WPA_ASE_8021X_PSK):
1189 		return WPA_ASE_8021X_PSK;
1190 	case WPA_SEL(WPA_ASE_NONE):
1191 		return WPA_ASE_NONE;
1192 	}
1193 	return 0;		/* NB: so is discarded */
1194 #undef WPA_SEL
1195 }
1196 
1197 /*
1198  * Parse a WPA information element to collect parameters.
1199  * Note that we do not validate security parameters; that
1200  * is handled by the authenticator; the parsing done here
1201  * is just for internal use in making operational decisions.
1202  */
1203 static int
1204 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1205 	struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1206 {
1207 	uint8_t len = frm[1];
1208 	uint32_t w;
1209 	int n;
1210 
1211 	/*
1212 	 * Check the length once for fixed parts: OUI, type,
1213 	 * version, mcast cipher, and 2 selector counts.
1214 	 * Other, variable-length data, must be checked separately.
1215 	 */
1216 	if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1217 		IEEE80211_DISCARD_IE(vap,
1218 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1219 		    wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1220 		return IEEE80211_REASON_IE_INVALID;
1221 	}
1222 	if (len < 14) {
1223 		IEEE80211_DISCARD_IE(vap,
1224 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1225 		    wh, "WPA", "too short, len %u", len);
1226 		return IEEE80211_REASON_IE_INVALID;
1227 	}
1228 	frm += 6, len -= 4;		/* NB: len is payload only */
1229 	/* NB: iswapoui already validated the OUI and type */
1230 	w = LE_READ_2(frm);
1231 	if (w != WPA_VERSION) {
1232 		IEEE80211_DISCARD_IE(vap,
1233 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1234 		    wh, "WPA", "bad version %u", w);
1235 		return IEEE80211_REASON_IE_INVALID;
1236 	}
1237 	frm += 2, len -= 2;
1238 
1239 	memset(rsn, 0, sizeof(*rsn));
1240 
1241 	/* multicast/group cipher */
1242 	rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1243 	frm += 4, len -= 4;
1244 
1245 	/* unicast ciphers */
1246 	n = LE_READ_2(frm);
1247 	frm += 2, len -= 2;
1248 	if (len < n*4+2) {
1249 		IEEE80211_DISCARD_IE(vap,
1250 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1251 		    wh, "WPA", "ucast cipher data too short; len %u, n %u",
1252 		    len, n);
1253 		return IEEE80211_REASON_IE_INVALID;
1254 	}
1255 	w = 0;
1256 	for (; n > 0; n--) {
1257 		w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1258 		frm += 4, len -= 4;
1259 	}
1260 	if (w & (1<<IEEE80211_CIPHER_TKIP))
1261 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1262 	else
1263 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1264 
1265 	/* key management algorithms */
1266 	n = LE_READ_2(frm);
1267 	frm += 2, len -= 2;
1268 	if (len < n*4) {
1269 		IEEE80211_DISCARD_IE(vap,
1270 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1271 		    wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1272 		    len, n);
1273 		return IEEE80211_REASON_IE_INVALID;
1274 	}
1275 	w = 0;
1276 	for (; n > 0; n--) {
1277 		w |= wpa_keymgmt(frm);
1278 		frm += 4, len -= 4;
1279 	}
1280 	if (w & WPA_ASE_8021X_UNSPEC)
1281 		rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1282 	else
1283 		rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1284 
1285 	if (len > 2)		/* optional capabilities */
1286 		rsn->rsn_caps = LE_READ_2(frm);
1287 
1288 	return 0;
1289 }
1290 
1291 /*
1292  * Convert an RSN cipher selector OUI to an internal
1293  * cipher algorithm.  Where appropriate we also
1294  * record any key length.
1295  */
1296 static int
1297 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1298 {
1299 #define	RSN_SEL(x)	(((x)<<24)|RSN_OUI)
1300 	uint32_t w = LE_READ_4(sel);
1301 
1302 	switch (w) {
1303 	case RSN_SEL(RSN_CSE_NULL):
1304 		return IEEE80211_CIPHER_NONE;
1305 	case RSN_SEL(RSN_CSE_WEP40):
1306 		if (keylen)
1307 			*keylen = 40 / NBBY;
1308 		return IEEE80211_CIPHER_WEP;
1309 	case RSN_SEL(RSN_CSE_WEP104):
1310 		if (keylen)
1311 			*keylen = 104 / NBBY;
1312 		return IEEE80211_CIPHER_WEP;
1313 	case RSN_SEL(RSN_CSE_TKIP):
1314 		return IEEE80211_CIPHER_TKIP;
1315 	case RSN_SEL(RSN_CSE_CCMP):
1316 		return IEEE80211_CIPHER_AES_CCM;
1317 	case RSN_SEL(RSN_CSE_WRAP):
1318 		return IEEE80211_CIPHER_AES_OCB;
1319 	}
1320 	return 32;		/* NB: so 1<< is discarded */
1321 #undef WPA_SEL
1322 }
1323 
1324 /*
1325  * Convert an RSN key management/authentication algorithm
1326  * to an internal code.
1327  */
1328 static int
1329 rsn_keymgmt(const uint8_t *sel)
1330 {
1331 #define	RSN_SEL(x)	(((x)<<24)|RSN_OUI)
1332 	uint32_t w = LE_READ_4(sel);
1333 
1334 	switch (w) {
1335 	case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1336 		return RSN_ASE_8021X_UNSPEC;
1337 	case RSN_SEL(RSN_ASE_8021X_PSK):
1338 		return RSN_ASE_8021X_PSK;
1339 	case RSN_SEL(RSN_ASE_NONE):
1340 		return RSN_ASE_NONE;
1341 	}
1342 	return 0;		/* NB: so is discarded */
1343 #undef RSN_SEL
1344 }
1345 
1346 /*
1347  * Parse a WPA/RSN information element to collect parameters
1348  * and validate the parameters against what has been
1349  * configured for the system.
1350  */
1351 static int
1352 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1353 	struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1354 {
1355 	uint8_t len = frm[1];
1356 	uint32_t w;
1357 	int n;
1358 
1359 	/*
1360 	 * Check the length once for fixed parts:
1361 	 * version, mcast cipher, and 2 selector counts.
1362 	 * Other, variable-length data, must be checked separately.
1363 	 */
1364 	if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1365 		IEEE80211_DISCARD_IE(vap,
1366 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1367 		    wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1368 		return IEEE80211_REASON_IE_INVALID;
1369 	}
1370 	if (len < 10) {
1371 		IEEE80211_DISCARD_IE(vap,
1372 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1373 		    wh, "RSN", "too short, len %u", len);
1374 		return IEEE80211_REASON_IE_INVALID;
1375 	}
1376 	frm += 2;
1377 	w = LE_READ_2(frm);
1378 	if (w != RSN_VERSION) {
1379 		IEEE80211_DISCARD_IE(vap,
1380 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1381 		    wh, "RSN", "bad version %u", w);
1382 		return IEEE80211_REASON_IE_INVALID;
1383 	}
1384 	frm += 2, len -= 2;
1385 
1386 	memset(rsn, 0, sizeof(*rsn));
1387 
1388 	/* multicast/group cipher */
1389 	rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1390 	frm += 4, len -= 4;
1391 
1392 	/* unicast ciphers */
1393 	n = LE_READ_2(frm);
1394 	frm += 2, len -= 2;
1395 	if (len < n*4+2) {
1396 		IEEE80211_DISCARD_IE(vap,
1397 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1398 		    wh, "RSN", "ucast cipher data too short; len %u, n %u",
1399 		    len, n);
1400 		return IEEE80211_REASON_IE_INVALID;
1401 	}
1402 	w = 0;
1403 	for (; n > 0; n--) {
1404 		w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1405 		frm += 4, len -= 4;
1406 	}
1407 	if (w & (1<<IEEE80211_CIPHER_TKIP))
1408 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1409 	else
1410 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1411 
1412 	/* key management algorithms */
1413 	n = LE_READ_2(frm);
1414 	frm += 2, len -= 2;
1415 	if (len < n*4) {
1416 		IEEE80211_DISCARD_IE(vap,
1417 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1418 		    wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1419 		    len, n);
1420 		return IEEE80211_REASON_IE_INVALID;
1421 	}
1422 	w = 0;
1423 	for (; n > 0; n--) {
1424 		w |= rsn_keymgmt(frm);
1425 		frm += 4, len -= 4;
1426 	}
1427 	if (w & RSN_ASE_8021X_UNSPEC)
1428 		rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1429 	else
1430 		rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1431 
1432 	/* optional RSN capabilities */
1433 	if (len > 2)
1434 		rsn->rsn_caps = LE_READ_2(frm);
1435 	/* XXXPMKID */
1436 
1437 	return 0;
1438 }
1439 
1440 /*
1441  * WPA/802.11i assocation request processing.
1442  */
1443 static int
1444 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1445 	const struct ieee80211_frame *wh, const uint8_t *wpa,
1446 	const uint8_t *rsn, uint16_t capinfo)
1447 {
1448 	struct ieee80211vap *vap = ni->ni_vap;
1449 	uint8_t reason;
1450 	int badwparsn;
1451 
1452 	ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1453 	if (wpa == NULL && rsn == NULL) {
1454 		if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1455 			/*
1456 			 * W-Fi Protected Setup (WPS) permits
1457 			 * clients to associate and pass EAPOL frames
1458 			 * to establish initial credentials.
1459 			 */
1460 			ni->ni_flags |= IEEE80211_NODE_WPS;
1461 			return 1;
1462 		}
1463 		if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1464 		    (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1465 			/*
1466 			 * Transitional Security Network.  Permits clients
1467 			 * to associate and use WEP while WPA is configured.
1468 			 */
1469 			ni->ni_flags |= IEEE80211_NODE_TSN;
1470 			return 1;
1471 		}
1472 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1473 		    wh, NULL, "%s", "no WPA/RSN IE in association request");
1474 		vap->iv_stats.is_rx_assoc_badwpaie++;
1475 		reason = IEEE80211_REASON_IE_INVALID;
1476 		goto bad;
1477 	}
1478 	/* assert right association security credentials */
1479 	badwparsn = 0;			/* NB: to silence compiler */
1480 	switch (vap->iv_flags & IEEE80211_F_WPA) {
1481 	case IEEE80211_F_WPA1:
1482 		badwparsn = (wpa == NULL);
1483 		break;
1484 	case IEEE80211_F_WPA2:
1485 		badwparsn = (rsn == NULL);
1486 		break;
1487 	case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1488 		badwparsn = (wpa == NULL && rsn == NULL);
1489 		break;
1490 	}
1491 	if (badwparsn) {
1492 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1493 		    wh, NULL,
1494 		    "%s", "missing WPA/RSN IE in association request");
1495 		vap->iv_stats.is_rx_assoc_badwpaie++;
1496 		reason = IEEE80211_REASON_IE_INVALID;
1497 		goto bad;
1498 	}
1499 	/*
1500 	 * Parse WPA/RSN information element.
1501 	 */
1502 	if (wpa != NULL)
1503 		reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1504 	else
1505 		reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1506 	if (reason != 0) {
1507 		/* XXX distinguish WPA/RSN? */
1508 		vap->iv_stats.is_rx_assoc_badwpaie++;
1509 		goto bad;
1510 	}
1511 	IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1512 	    "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1513 	    wpa != NULL ? "WPA" : "RSN",
1514 	    rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1515 	    rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1516 	    rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1517 
1518 	return 1;
1519 bad:
1520 	ieee80211_node_deauth(ni, reason);
1521 	return 0;
1522 }
1523 
1524 /* XXX find a better place for definition */
1525 struct l2_update_frame {
1526 	struct ether_header eh;
1527 	uint8_t dsap;
1528 	uint8_t ssap;
1529 	uint8_t control;
1530 	uint8_t xid[3];
1531 }  __packed;
1532 
1533 /*
1534  * Deliver a TGf L2UF frame on behalf of a station.
1535  * This primes any bridge when the station is roaming
1536  * between ap's on the same wired network.
1537  */
1538 static void
1539 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1540 {
1541 	struct ieee80211vap *vap = ni->ni_vap;
1542 	struct ifnet *ifp = vap->iv_ifp;
1543 	struct mbuf *m;
1544 	struct l2_update_frame *l2uf;
1545 	struct ether_header *eh;
1546 
1547 	m = m_gethdr(M_NOWAIT, MT_DATA);
1548 	if (m == NULL) {
1549 		IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1550 		    "%s", "no mbuf for l2uf frame");
1551 		vap->iv_stats.is_rx_nobuf++;	/* XXX not right */
1552 		return;
1553 	}
1554 	l2uf = mtod(m, struct l2_update_frame *);
1555 	eh = &l2uf->eh;
1556 	/* dst: Broadcast address */
1557 	IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1558 	/* src: associated STA */
1559 	IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1560 	eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1561 
1562 	l2uf->dsap = 0;
1563 	l2uf->ssap = 0;
1564 	l2uf->control = 0xf5;
1565 	l2uf->xid[0] = 0x81;
1566 	l2uf->xid[1] = 0x80;
1567 	l2uf->xid[2] = 0x00;
1568 
1569 	m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1570 	hostap_deliver_data(vap, ni, m);
1571 }
1572 
1573 static void
1574 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1575 	int reassoc, int resp, const char *tag, int rate)
1576 {
1577 	IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1578 	    "deny %s request, %s rate set mismatch, rate/MCS %d",
1579 	    reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1580 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1581 	ieee80211_node_leave(ni);
1582 }
1583 
1584 static void
1585 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1586 	int reassoc, int resp, const char *tag, int capinfo)
1587 {
1588 	struct ieee80211vap *vap = ni->ni_vap;
1589 
1590 	IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1591 	    "deny %s request, %s mismatch 0x%x",
1592 	    reassoc ? "reassoc" : "assoc", tag, capinfo);
1593 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1594 	ieee80211_node_leave(ni);
1595 	vap->iv_stats.is_rx_assoc_capmismatch++;
1596 }
1597 
1598 static void
1599 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1600 	int reassoc, int resp)
1601 {
1602 	IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1603 	    "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1604 	/* XXX no better code */
1605 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_OTHER);
1606 	ieee80211_node_leave(ni);
1607 }
1608 
1609 static void
1610 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1611 	int algo, int seq, int status)
1612 {
1613 	struct ieee80211vap *vap = ni->ni_vap;
1614 
1615 	IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1616 	    wh, NULL, "unsupported alg %d", algo);
1617 	vap->iv_stats.is_rx_auth_unsupported++;
1618 	ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1619 	    seq | (status << 16));
1620 }
1621 
1622 static __inline int
1623 ishtmixed(const uint8_t *ie)
1624 {
1625 	const struct ieee80211_ie_htinfo *ht =
1626 	    (const struct ieee80211_ie_htinfo *) ie;
1627 	return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1628 	    IEEE80211_HTINFO_OPMODE_MIXED;
1629 }
1630 
1631 static int
1632 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1633 {
1634 	static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1635 	int i;
1636 
1637 	/* NB: the 11b clients we care about will not have xrates */
1638 	if (xrates != NULL || rates == NULL)
1639 		return 0;
1640 	for (i = 0; i < rates[1]; i++) {
1641 		int r = rates[2+i] & IEEE80211_RATE_VAL;
1642 		if (r > 2*11 || ((1<<r) & brates) == 0)
1643 			return 0;
1644 	}
1645 	return 1;
1646 }
1647 
1648 static void
1649 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1650 	int subtype, int rssi, int noise, uint32_t rstamp)
1651 {
1652 	struct ieee80211vap *vap = ni->ni_vap;
1653 	struct ieee80211com *ic = ni->ni_ic;
1654 	struct ieee80211_frame *wh;
1655 	uint8_t *frm, *efrm, *sfrm;
1656 	uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1657 	int reassoc, resp;
1658 	uint8_t rate;
1659 
1660 	wh = mtod(m0, struct ieee80211_frame *);
1661 	frm = (uint8_t *)&wh[1];
1662 	efrm = mtod(m0, uint8_t *) + m0->m_len;
1663 	switch (subtype) {
1664 	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1665 	case IEEE80211_FC0_SUBTYPE_BEACON: {
1666 		struct ieee80211_scanparams scan;
1667 		/*
1668 		 * We process beacon/probe response frames when scanning;
1669 		 * otherwise we check beacon frames for overlapping non-ERP
1670 		 * BSS in 11g and/or overlapping legacy BSS when in HT.
1671 		 */
1672 		if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1673 		    subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1674 			vap->iv_stats.is_rx_mgtdiscard++;
1675 			return;
1676 		}
1677 		/* NB: accept off-channel frames */
1678 		if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1679 			return;
1680 		/*
1681 		 * Count frame now that we know it's to be processed.
1682 		 */
1683 		if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1684 			vap->iv_stats.is_rx_beacon++;		/* XXX remove */
1685 			IEEE80211_NODE_STAT(ni, rx_beacons);
1686 		} else
1687 			IEEE80211_NODE_STAT(ni, rx_proberesp);
1688 		/*
1689 		 * If scanning, just pass information to the scan module.
1690 		 */
1691 		if (ic->ic_flags & IEEE80211_F_SCAN) {
1692 			if (scan.status == 0 &&		/* NB: on channel */
1693 			    (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1694 				/*
1695 				 * Actively scanning a channel marked passive;
1696 				 * send a probe request now that we know there
1697 				 * is 802.11 traffic present.
1698 				 *
1699 				 * XXX check if the beacon we recv'd gives
1700 				 * us what we need and suppress the probe req
1701 				 */
1702 				ieee80211_probe_curchan(vap, 1);
1703 				ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1704 			}
1705 			ieee80211_add_scan(vap, &scan, wh,
1706 				subtype, rssi, noise, rstamp);
1707 			return;
1708 		}
1709 		/*
1710 		 * Check beacon for overlapping bss w/ non ERP stations.
1711 		 * If we detect one and protection is configured but not
1712 		 * enabled, enable it and start a timer that'll bring us
1713 		 * out if we stop seeing the bss.
1714 		 */
1715 		if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1716 		    scan.status == 0 &&			/* NB: on-channel */
1717 		    ((scan.erp & 0x100) == 0 ||		/* NB: no ERP, 11b sta*/
1718 		     (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1719 			ic->ic_lastnonerp = ticks;
1720 			ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1721 			if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1722 			    (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1723 				IEEE80211_NOTE_FRAME(vap,
1724 				    IEEE80211_MSG_ASSOC, wh,
1725 				    "non-ERP present on channel %d "
1726 				    "(saw erp 0x%x from channel %d), "
1727 				    "enable use of protection",
1728 				    ic->ic_curchan->ic_ieee,
1729 				    scan.erp, scan.chan);
1730 				ic->ic_flags |= IEEE80211_F_USEPROT;
1731 				ieee80211_notify_erp(ic);
1732 			}
1733 		}
1734 		/*
1735 		 * Check beacon for non-HT station on HT channel
1736 		 * and update HT BSS occupancy as appropriate.
1737 		 */
1738 		if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1739 			if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1740 				/*
1741 				 * Off control channel; only check frames
1742 				 * that come in the extension channel when
1743 				 * operating w/ HT40.
1744 				 */
1745 				if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1746 					break;
1747 				if (scan.chan != ic->ic_curchan->ic_extieee)
1748 					break;
1749 			}
1750 			if (scan.htinfo == NULL) {
1751 				ieee80211_htprot_update(ic,
1752 				    IEEE80211_HTINFO_OPMODE_PROTOPT |
1753 				    IEEE80211_HTINFO_NONHT_PRESENT);
1754 			} else if (ishtmixed(scan.htinfo)) {
1755 				/* XXX? take NONHT_PRESENT from beacon? */
1756 				ieee80211_htprot_update(ic,
1757 				    IEEE80211_HTINFO_OPMODE_MIXED |
1758 				    IEEE80211_HTINFO_NONHT_PRESENT);
1759 			}
1760 		}
1761 		break;
1762 	}
1763 
1764 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1765 		if (vap->iv_state != IEEE80211_S_RUN) {
1766 			vap->iv_stats.is_rx_mgtdiscard++;
1767 			return;
1768 		}
1769 		/*
1770 		 * prreq frame format
1771 		 *	[tlv] ssid
1772 		 *	[tlv] supported rates
1773 		 *	[tlv] extended supported rates
1774 		 */
1775 		ssid = rates = xrates = NULL;
1776 		sfrm = frm;
1777 		while (efrm - frm > 1) {
1778 			IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1779 			switch (*frm) {
1780 			case IEEE80211_ELEMID_SSID:
1781 				ssid = frm;
1782 				break;
1783 			case IEEE80211_ELEMID_RATES:
1784 				rates = frm;
1785 				break;
1786 			case IEEE80211_ELEMID_XRATES:
1787 				xrates = frm;
1788 				break;
1789 			}
1790 			frm += frm[1] + 2;
1791 		}
1792 		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1793 		if (xrates != NULL)
1794 			IEEE80211_VERIFY_ELEMENT(xrates,
1795 				IEEE80211_RATE_MAXSIZE - rates[1], return);
1796 		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1797 		IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1798 		if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1799 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1800 			    wh, NULL,
1801 			    "%s", "no ssid with ssid suppression enabled");
1802 			vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1803 			return;
1804 		}
1805 
1806 		/* XXX find a better class or define it's own */
1807 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1808 		    "%s", "recv probe req");
1809 		/*
1810 		 * Some legacy 11b clients cannot hack a complete
1811 		 * probe response frame.  When the request includes
1812 		 * only a bare-bones rate set, communicate this to
1813 		 * the transmit side.
1814 		 */
1815 		ieee80211_send_proberesp(vap, wh->i_addr2,
1816 		    is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1817 		break;
1818 
1819 	case IEEE80211_FC0_SUBTYPE_AUTH: {
1820 		uint16_t algo, seq, status;
1821 
1822 		if (vap->iv_state != IEEE80211_S_RUN) {
1823 			vap->iv_stats.is_rx_mgtdiscard++;
1824 			return;
1825 		}
1826 		if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1827 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1828 			    wh, NULL, "%s", "wrong bssid");
1829 			vap->iv_stats.is_rx_wrongbss++;	/*XXX unique stat?*/
1830 			return;
1831 		}
1832 		/*
1833 		 * auth frame format
1834 		 *	[2] algorithm
1835 		 *	[2] sequence
1836 		 *	[2] status
1837 		 *	[tlv*] challenge
1838 		 */
1839 		IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1840 		algo   = le16toh(*(uint16_t *)frm);
1841 		seq    = le16toh(*(uint16_t *)(frm + 2));
1842 		status = le16toh(*(uint16_t *)(frm + 4));
1843 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1844 		    "recv auth frame with algorithm %d seq %d", algo, seq);
1845 		/*
1846 		 * Consult the ACL policy module if setup.
1847 		 */
1848 		if (vap->iv_acl != NULL &&
1849 		    !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1850 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1851 			    wh, NULL, "%s", "disallowed by ACL");
1852 			vap->iv_stats.is_rx_acl++;
1853 			ieee80211_send_error(ni, wh->i_addr2,
1854 			    IEEE80211_FC0_SUBTYPE_AUTH,
1855 			    (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1856 			return;
1857 		}
1858 		if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1859 			IEEE80211_DISCARD(vap,
1860 			    IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1861 			    wh, NULL, "%s", "TKIP countermeasures enabled");
1862 			vap->iv_stats.is_rx_auth_countermeasures++;
1863 			ieee80211_send_error(ni, wh->i_addr2,
1864 				IEEE80211_FC0_SUBTYPE_AUTH,
1865 				IEEE80211_REASON_MIC_FAILURE);
1866 			return;
1867 		}
1868 		if (algo == IEEE80211_AUTH_ALG_SHARED)
1869 			hostap_auth_shared(ni, wh, frm + 6, efrm, rssi,
1870 			    noise, rstamp, seq, status);
1871 		else if (algo == IEEE80211_AUTH_ALG_OPEN)
1872 			hostap_auth_open(ni, wh, rssi, noise, rstamp,
1873 			    seq, status);
1874 		else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1875 			authalgreject(ni, wh, algo,
1876 			    seq+1, IEEE80211_STATUS_ALG);
1877 			return;
1878 		} else {
1879 			/*
1880 			 * We assume that an unknown algorithm is the result
1881 			 * of a decryption failure on a shared key auth frame;
1882 			 * return a status code appropriate for that instead
1883 			 * of IEEE80211_STATUS_ALG.
1884 			 *
1885 			 * NB: a seq# of 4 is intentional; the decrypted
1886 			 *     frame likely has a bogus seq value.
1887 			 */
1888 			authalgreject(ni, wh, algo,
1889 			    4, IEEE80211_STATUS_CHALLENGE);
1890 			return;
1891 		}
1892 		break;
1893 	}
1894 
1895 	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1896 	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1897 		uint16_t capinfo, lintval;
1898 		struct ieee80211_rsnparms rsnparms;
1899 
1900 		if (vap->iv_state != IEEE80211_S_RUN) {
1901 			vap->iv_stats.is_rx_mgtdiscard++;
1902 			return;
1903 		}
1904 		if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1905 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1906 			    wh, NULL, "%s", "wrong bssid");
1907 			vap->iv_stats.is_rx_assoc_bss++;
1908 			return;
1909 		}
1910 		if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1911 			reassoc = 1;
1912 			resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1913 		} else {
1914 			reassoc = 0;
1915 			resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1916 		}
1917 		if (ni == vap->iv_bss) {
1918 			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1919 			    "deny %s request, sta not authenticated",
1920 			    reassoc ? "reassoc" : "assoc");
1921 			ieee80211_send_error(ni, wh->i_addr2,
1922 			    IEEE80211_FC0_SUBTYPE_DEAUTH,
1923 			    IEEE80211_REASON_ASSOC_NOT_AUTHED);
1924 			vap->iv_stats.is_rx_assoc_notauth++;
1925 			return;
1926 		}
1927 
1928 		/*
1929 		 * asreq frame format
1930 		 *	[2] capability information
1931 		 *	[2] listen interval
1932 		 *	[6*] current AP address (reassoc only)
1933 		 *	[tlv] ssid
1934 		 *	[tlv] supported rates
1935 		 *	[tlv] extended supported rates
1936 		 *	[tlv] WPA or RSN
1937 		 *	[tlv] HT capabilities
1938 		 *	[tlv] Atheros capabilities
1939 		 */
1940 		IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1941 		capinfo = le16toh(*(uint16_t *)frm);	frm += 2;
1942 		lintval = le16toh(*(uint16_t *)frm);	frm += 2;
1943 		if (reassoc)
1944 			frm += 6;	/* ignore current AP info */
1945 		ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1946 		sfrm = frm;
1947 		while (efrm - frm > 1) {
1948 			IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1949 			switch (*frm) {
1950 			case IEEE80211_ELEMID_SSID:
1951 				ssid = frm;
1952 				break;
1953 			case IEEE80211_ELEMID_RATES:
1954 				rates = frm;
1955 				break;
1956 			case IEEE80211_ELEMID_XRATES:
1957 				xrates = frm;
1958 				break;
1959 			case IEEE80211_ELEMID_RSN:
1960 				rsn = frm;
1961 				break;
1962 			case IEEE80211_ELEMID_HTCAP:
1963 				htcap = frm;
1964 				break;
1965 			case IEEE80211_ELEMID_VENDOR:
1966 				if (iswpaoui(frm))
1967 					wpa = frm;
1968 				else if (iswmeinfo(frm))
1969 					wme = frm;
1970 				else if (isatherosoui(frm))
1971 					ath = frm;
1972 				else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) {
1973 					if (ishtcapoui(frm) && htcap == NULL)
1974 						htcap = frm;
1975 				}
1976 				break;
1977 			}
1978 			frm += frm[1] + 2;
1979 		}
1980 		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1981 		if (xrates != NULL)
1982 			IEEE80211_VERIFY_ELEMENT(xrates,
1983 				IEEE80211_RATE_MAXSIZE - rates[1], return);
1984 		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1985 		IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1986 		if (htcap != NULL) {
1987 			IEEE80211_VERIFY_LENGTH(htcap[1],
1988 			     htcap[0] == IEEE80211_ELEMID_VENDOR ?
1989 			         4 + sizeof(struct ieee80211_ie_htcap)-2 :
1990 			         sizeof(struct ieee80211_ie_htcap)-2,
1991 			     return);		/* XXX just NULL out? */
1992 		}
1993 
1994 		if ((vap->iv_flags & IEEE80211_F_WPA) &&
1995 		    !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
1996 			return;
1997 		/* discard challenge after association */
1998 		if (ni->ni_challenge != NULL) {
1999 			free(ni->ni_challenge, M_80211_NODE);
2000 			ni->ni_challenge = NULL;
2001 		}
2002 		/* NB: 802.11 spec says to ignore station's privacy bit */
2003 		if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2004 			capinfomismatch(ni, wh, reassoc, resp,
2005 			    "capability", capinfo);
2006 			return;
2007 		}
2008 		/*
2009 		 * Disallow re-associate w/ invalid slot time setting.
2010 		 */
2011 		if (ni->ni_associd != 0 &&
2012 		    IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2013 		    ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2014 			capinfomismatch(ni, wh, reassoc, resp,
2015 			    "slot time", capinfo);
2016 			return;
2017 		}
2018 		rate = ieee80211_setup_rates(ni, rates, xrates,
2019 				IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2020 				IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2021 		if (rate & IEEE80211_RATE_BASIC) {
2022 			ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2023 			vap->iv_stats.is_rx_assoc_norate++;
2024 			return;
2025 		}
2026 		/*
2027 		 * If constrained to 11g-only stations reject an
2028 		 * 11b-only station.  We cheat a bit here by looking
2029 		 * at the max negotiated xmit rate and assuming anyone
2030 		 * with a best rate <24Mb/s is an 11b station.
2031 		 */
2032 		if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2033 			ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2034 			vap->iv_stats.is_rx_assoc_norate++;
2035 			return;
2036 		}
2037 		/*
2038 		 * Do HT rate set handling and setup HT node state.
2039 		 */
2040 		ni->ni_chan = vap->iv_bss->ni_chan;
2041 		if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2042 			rate = ieee80211_setup_htrates(ni, htcap,
2043 				IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2044 				IEEE80211_F_DOBRS);
2045 			if (rate & IEEE80211_RATE_BASIC) {
2046 				ratesetmismatch(ni, wh, reassoc, resp,
2047 				    "HT", rate);
2048 				vap->iv_stats.is_ht_assoc_norate++;
2049 				return;
2050 			}
2051 			ieee80211_ht_node_init(ni);
2052 			ieee80211_ht_updatehtcap(ni, htcap);
2053 		} else if (ni->ni_flags & IEEE80211_NODE_HT)
2054 			ieee80211_ht_node_cleanup(ni);
2055 		/*
2056 		 * Allow AMPDU operation only with unencrypted traffic
2057 		 * or AES-CCM; the 11n spec only specifies these ciphers
2058 		 * so permitting any others is undefined and can lead
2059 		 * to interoperability problems.
2060 		 */
2061 		if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2062 		    (((vap->iv_flags & IEEE80211_F_WPA) &&
2063 		      rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2064 		     (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2065 			IEEE80211_NOTE(vap,
2066 			    IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2067 			    "disallow HT use because WEP or TKIP requested, "
2068 			    "capinfo 0x%x ucastcipher %d", capinfo,
2069 			    rsnparms.rsn_ucastcipher);
2070 			ieee80211_ht_node_cleanup(ni);
2071 			vap->iv_stats.is_ht_assoc_downgrade++;
2072 		}
2073 		/*
2074 		 * If constrained to 11n-only stations reject legacy stations.
2075 		 */
2076 		if ((vap->iv_flags_ext & IEEE80211_FEXT_PUREN) &&
2077 		    (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2078 			htcapmismatch(ni, wh, reassoc, resp);
2079 			vap->iv_stats.is_ht_assoc_nohtcap++;
2080 			return;
2081 		}
2082 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2083 		ni->ni_noise = noise;
2084 		ni->ni_rstamp = rstamp;
2085 		ni->ni_intval = lintval;
2086 		ni->ni_capinfo = capinfo;
2087 		ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2088 		ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2089 		/*
2090 		 * Store the IEs.
2091 		 * XXX maybe better to just expand
2092 		 */
2093 		if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2094 #define	setie(_ie, _off)	ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2095 			if (wpa != NULL)
2096 				setie(wpa_ie, wpa - sfrm);
2097 			if (rsn != NULL)
2098 				setie(rsn_ie, rsn - sfrm);
2099 			if (htcap != NULL)
2100 				setie(htcap_ie, htcap - sfrm);
2101 			if (wme != NULL) {
2102 				setie(wme_ie, wme - sfrm);
2103 				/*
2104 				 * Mark node as capable of QoS.
2105 				 */
2106 				ni->ni_flags |= IEEE80211_NODE_QOS;
2107 			} else
2108 				ni->ni_flags &= ~IEEE80211_NODE_QOS;
2109 			if (ath != NULL) {
2110 				setie(ath_ie, ath - sfrm);
2111 				/*
2112 				 * Parse ATH station parameters.
2113 				 */
2114 				ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2115 			} else
2116 				ni->ni_ath_flags = 0;
2117 #undef setie
2118 		} else {
2119 			ni->ni_flags &= ~IEEE80211_NODE_QOS;
2120 			ni->ni_ath_flags = 0;
2121 		}
2122 		ieee80211_node_join(ni, resp);
2123 		ieee80211_deliver_l2uf(ni);
2124 		break;
2125 	}
2126 
2127 	case IEEE80211_FC0_SUBTYPE_DEAUTH:
2128 	case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2129 		uint16_t reason;
2130 
2131 		if (vap->iv_state != IEEE80211_S_RUN ||
2132 		    /* NB: can happen when in promiscuous mode */
2133 		    !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2134 			vap->iv_stats.is_rx_mgtdiscard++;
2135 			break;
2136 		}
2137 		/*
2138 		 * deauth/disassoc frame format
2139 		 *	[2] reason
2140 		 */
2141 		IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2142 		reason = le16toh(*(uint16_t *)frm);
2143 		if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2144 			vap->iv_stats.is_rx_deauth++;
2145 			IEEE80211_NODE_STAT(ni, rx_deauth);
2146 		} else {
2147 			vap->iv_stats.is_rx_disassoc++;
2148 			IEEE80211_NODE_STAT(ni, rx_disassoc);
2149 		}
2150 		IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2151 		    "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2152 			IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2153 		if (ni != vap->iv_bss)
2154 			ieee80211_node_leave(ni);
2155 		break;
2156 	}
2157 
2158 	case IEEE80211_FC0_SUBTYPE_ACTION:
2159 		if (vap->iv_state == IEEE80211_S_RUN) {
2160 			if (ieee80211_parse_action(ni, m0) == 0)
2161 				ic->ic_recv_action(ni, frm, efrm);
2162 		} else
2163 			vap->iv_stats.is_rx_mgtdiscard++;
2164 		break;
2165 
2166 	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2167 	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2168 	default:
2169 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2170 		     wh, "mgt", "subtype 0x%x not handled", subtype);
2171 		vap->iv_stats.is_rx_badsubtype++;
2172 		break;
2173 	}
2174 }
2175 
2176 /*
2177  * Process a received ps-poll frame.
2178  */
2179 static void
2180 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2181 {
2182 	struct ieee80211vap *vap = ni->ni_vap;
2183 	struct ieee80211_frame_min *wh;
2184 	struct ifnet *ifp;
2185 	struct mbuf *m;
2186 	uint16_t aid;
2187 	int qlen;
2188 
2189 	wh = mtod(m0, struct ieee80211_frame_min *);
2190 	if (ni->ni_associd == 0) {
2191 		IEEE80211_DISCARD(vap,
2192 		    IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2193 		    (struct ieee80211_frame *) wh, NULL,
2194 		    "%s", "unassociated station");
2195 		vap->iv_stats.is_ps_unassoc++;
2196 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2197 			IEEE80211_REASON_NOT_ASSOCED);
2198 		return;
2199 	}
2200 
2201 	aid = le16toh(*(uint16_t *)wh->i_dur);
2202 	if (aid != ni->ni_associd) {
2203 		IEEE80211_DISCARD(vap,
2204 		    IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2205 		    (struct ieee80211_frame *) wh, NULL,
2206 		    "aid mismatch: sta aid 0x%x poll aid 0x%x",
2207 		    ni->ni_associd, aid);
2208 		vap->iv_stats.is_ps_badaid++;
2209 		/*
2210 		 * NB: We used to deauth the station but it turns out
2211 		 * the Blackberry Curve 8230 (and perhaps other devices)
2212 		 * sometimes send the wrong AID when WME is negotiated.
2213 		 * Being more lenient here seems ok as we already check
2214 		 * the station is associated and we only return frames
2215 		 * queued for the station (i.e. we don't use the AID).
2216 		 */
2217 		return;
2218 	}
2219 
2220 	/* Okay, take the first queued packet and put it out... */
2221 	m = ieee80211_node_psq_dequeue(ni, &qlen);
2222 	if (m == NULL) {
2223 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2224 		    "%s", "recv ps-poll, but queue empty");
2225 		ieee80211_send_nulldata(ieee80211_ref_node(ni));
2226 		vap->iv_stats.is_ps_qempty++;	/* XXX node stat */
2227 		if (vap->iv_set_tim != NULL)
2228 			vap->iv_set_tim(ni, 0);	/* just in case */
2229 		return;
2230 	}
2231 	/*
2232 	 * If there are more packets, set the more packets bit
2233 	 * in the packet dispatched to the station; otherwise
2234 	 * turn off the TIM bit.
2235 	 */
2236 	if (qlen != 0) {
2237 		IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2238 		    "recv ps-poll, send packet, %u still queued", qlen);
2239 		m->m_flags |= M_MORE_DATA;
2240 	} else {
2241 		IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2242 		    "%s", "recv ps-poll, send packet, queue empty");
2243 		if (vap->iv_set_tim != NULL)
2244 			vap->iv_set_tim(ni, 0);
2245 	}
2246 	m->m_flags |= M_PWR_SAV;		/* bypass PS handling */
2247 
2248 	if (m->m_flags & M_ENCAP)
2249 		ifp = vap->iv_ic->ic_ifp;
2250 	else
2251 		ifp = vap->iv_ifp;
2252 	IF_ENQUEUE(&ifp->if_snd, m);
2253 	if_start(ifp);
2254 }
2255