xref: /freebsd/sys/net80211/ieee80211_hostap.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
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_var.h>
52 #include <net/if_media.h>
53 #include <net/if_llc.h>
54 #include <net/ethernet.h>
55 
56 #include <net/bpf.h>
57 
58 #include <net80211/ieee80211_var.h>
59 #include <net80211/ieee80211_hostap.h>
60 #include <net80211/ieee80211_input.h>
61 #ifdef IEEE80211_SUPPORT_SUPERG
62 #include <net80211/ieee80211_superg.h>
63 #endif
64 #include <net80211/ieee80211_wds.h>
65 
66 #define	IEEE80211_RATE2MBS(r)	(((r) & IEEE80211_RATE_VAL) / 2)
67 
68 static	void hostap_vattach(struct ieee80211vap *);
69 static	int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
70 static	int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
71 	    int rssi, int nf);
72 static void hostap_deliver_data(struct ieee80211vap *,
73 	    struct ieee80211_node *, struct mbuf *);
74 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 	    int subtype, int rssi, int nf);
76 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
77 
78 void
79 ieee80211_hostap_attach(struct ieee80211com *ic)
80 {
81 	ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
82 }
83 
84 void
85 ieee80211_hostap_detach(struct ieee80211com *ic)
86 {
87 }
88 
89 static void
90 hostap_vdetach(struct ieee80211vap *vap)
91 {
92 }
93 
94 static void
95 hostap_vattach(struct ieee80211vap *vap)
96 {
97 	vap->iv_newstate = hostap_newstate;
98 	vap->iv_input = hostap_input;
99 	vap->iv_recv_mgmt = hostap_recv_mgmt;
100 	vap->iv_recv_ctl = hostap_recv_ctl;
101 	vap->iv_opdetach = hostap_vdetach;
102 	vap->iv_deliver_data = hostap_deliver_data;
103 	vap->iv_recv_pspoll = ieee80211_recv_pspoll;
104 }
105 
106 static void
107 sta_disassoc(void *arg, struct ieee80211_node *ni)
108 {
109 	struct ieee80211vap *vap = arg;
110 
111 	if (ni->ni_vap == vap && ni->ni_associd != 0) {
112 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
113 			IEEE80211_REASON_ASSOC_LEAVE);
114 		ieee80211_node_leave(ni);
115 	}
116 }
117 
118 static void
119 sta_csa(void *arg, struct ieee80211_node *ni)
120 {
121 	struct ieee80211vap *vap = arg;
122 
123 	if (ni->ni_vap == vap && ni->ni_associd != 0)
124 		if (ni->ni_inact > vap->iv_inact_init) {
125 			ni->ni_inact = vap->iv_inact_init;
126 			IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
127 			    "%s: inact %u", __func__, ni->ni_inact);
128 		}
129 }
130 
131 static void
132 sta_drop(void *arg, struct ieee80211_node *ni)
133 {
134 	struct ieee80211vap *vap = arg;
135 
136 	if (ni->ni_vap == vap && ni->ni_associd != 0)
137 		ieee80211_node_leave(ni);
138 }
139 
140 /*
141  * Does a channel change require associated stations to re-associate
142  * so protocol state is correct.  This is used when doing CSA across
143  * bands or similar (e.g. HT -> legacy).
144  */
145 static int
146 isbandchange(struct ieee80211com *ic)
147 {
148 	return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
149 	    (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
150 	     IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
151 }
152 
153 /*
154  * IEEE80211_M_HOSTAP vap state machine handler.
155  */
156 static int
157 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
158 {
159 	struct ieee80211com *ic = vap->iv_ic;
160 	enum ieee80211_state ostate;
161 
162 	IEEE80211_LOCK_ASSERT(ic);
163 
164 	ostate = vap->iv_state;
165 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
166 	    __func__, ieee80211_state_name[ostate],
167 	    ieee80211_state_name[nstate], arg);
168 	vap->iv_state = nstate;			/* state transition */
169 	if (ostate != IEEE80211_S_SCAN)
170 		ieee80211_cancel_scan(vap);	/* background scan */
171 	switch (nstate) {
172 	case IEEE80211_S_INIT:
173 		switch (ostate) {
174 		case IEEE80211_S_SCAN:
175 			ieee80211_cancel_scan(vap);
176 			break;
177 		case IEEE80211_S_CAC:
178 			ieee80211_dfs_cac_stop(vap);
179 			break;
180 		case IEEE80211_S_RUN:
181 			ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
182 			break;
183 		default:
184 			break;
185 		}
186 		if (ostate != IEEE80211_S_INIT) {
187 			/* NB: optimize INIT -> INIT case */
188 			ieee80211_reset_bss(vap);
189 		}
190 		if (vap->iv_auth->ia_detach != NULL)
191 			vap->iv_auth->ia_detach(vap);
192 		break;
193 	case IEEE80211_S_SCAN:
194 		switch (ostate) {
195 		case IEEE80211_S_CSA:
196 		case IEEE80211_S_RUN:
197 			ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
198 			/*
199 			 * Clear overlapping BSS state; the beacon frame
200 			 * will be reconstructed on transition to the RUN
201 			 * state and the timeout routines check if the flag
202 			 * is set before doing anything so this is sufficient.
203 			 */
204 			ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
205 			ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
206 			/* fall thru... */
207 		case IEEE80211_S_CAC:
208 			/*
209 			 * NB: We may get here because of a manual channel
210 			 *     change in which case we need to stop CAC
211 			 * XXX no need to stop if ostate RUN but it's ok
212 			 */
213 			ieee80211_dfs_cac_stop(vap);
214 			/* fall thru... */
215 		case IEEE80211_S_INIT:
216 			if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
217 			    !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
218 				/*
219 				 * Already have a channel; bypass the
220 				 * scan and startup immediately.
221 				 * ieee80211_create_ibss will call back to
222 				 * move us to RUN state.
223 				 */
224 				ieee80211_create_ibss(vap, vap->iv_des_chan);
225 				break;
226 			}
227 			/*
228 			 * Initiate a scan.  We can come here as a result
229 			 * of an IEEE80211_IOC_SCAN_REQ too in which case
230 			 * the vap will be marked with IEEE80211_FEXT_SCANREQ
231 			 * and the scan request parameters will be present
232 			 * in iv_scanreq.  Otherwise we do the default.
233 			 */
234 			if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
235 				ieee80211_check_scan(vap,
236 				    vap->iv_scanreq_flags,
237 				    vap->iv_scanreq_duration,
238 				    vap->iv_scanreq_mindwell,
239 				    vap->iv_scanreq_maxdwell,
240 				    vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
241 				vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
242 			} else
243 				ieee80211_check_scan_current(vap);
244 			break;
245 		case IEEE80211_S_SCAN:
246 			/*
247 			 * A state change requires a reset; scan.
248 			 */
249 			ieee80211_check_scan_current(vap);
250 			break;
251 		default:
252 			break;
253 		}
254 		break;
255 	case IEEE80211_S_CAC:
256 		/*
257 		 * Start CAC on a DFS channel.  We come here when starting
258 		 * a bss on a DFS channel (see ieee80211_create_ibss).
259 		 */
260 		ieee80211_dfs_cac_start(vap);
261 		break;
262 	case IEEE80211_S_RUN:
263 		if (vap->iv_flags & IEEE80211_F_WPA) {
264 			/* XXX validate prerequisites */
265 		}
266 		switch (ostate) {
267 		case IEEE80211_S_INIT:
268 			/*
269 			 * Already have a channel; bypass the
270 			 * scan and startup immediately.
271 			 * Note that ieee80211_create_ibss will call
272 			 * back to do a RUN->RUN state change.
273 			 */
274 			ieee80211_create_ibss(vap,
275 			    ieee80211_ht_adjust_channel(ic,
276 				ic->ic_curchan, vap->iv_flags_ht));
277 			/* NB: iv_bss is changed on return */
278 			break;
279 		case IEEE80211_S_CAC:
280 			/*
281 			 * NB: This is the normal state change when CAC
282 			 * expires and no radar was detected; no need to
283 			 * clear the CAC timer as it's already expired.
284 			 */
285 			/* fall thru... */
286 		case IEEE80211_S_CSA:
287 			/*
288 			 * Shorten inactivity timer of associated stations
289 			 * to weed out sta's that don't follow a CSA.
290 			 */
291 			ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
292 			/*
293 			 * Update bss node channel to reflect where
294 			 * we landed after CSA.
295 			 */
296 			ieee80211_node_set_chan(vap->iv_bss,
297 			    ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
298 				ieee80211_htchanflags(vap->iv_bss->ni_chan)));
299 			/* XXX bypass debug msgs */
300 			break;
301 		case IEEE80211_S_SCAN:
302 		case IEEE80211_S_RUN:
303 #ifdef IEEE80211_DEBUG
304 			if (ieee80211_msg_debug(vap)) {
305 				struct ieee80211_node *ni = vap->iv_bss;
306 				ieee80211_note(vap,
307 				    "synchronized with %s ssid ",
308 				    ether_sprintf(ni->ni_bssid));
309 				ieee80211_print_essid(ni->ni_essid,
310 				    ni->ni_esslen);
311 				/* XXX MCS/HT */
312 				printf(" channel %d start %uMb\n",
313 				    ieee80211_chan2ieee(ic, ic->ic_curchan),
314 				    IEEE80211_RATE2MBS(ni->ni_txrate));
315 			}
316 #endif
317 			break;
318 		default:
319 			break;
320 		}
321 		/*
322 		 * Start/stop the authenticator.  We delay until here
323 		 * to allow configuration to happen out of order.
324 		 */
325 		if (vap->iv_auth->ia_attach != NULL) {
326 			/* XXX check failure */
327 			vap->iv_auth->ia_attach(vap);
328 		} else if (vap->iv_auth->ia_detach != NULL) {
329 			vap->iv_auth->ia_detach(vap);
330 		}
331 		ieee80211_node_authorize(vap->iv_bss);
332 		break;
333 	case IEEE80211_S_CSA:
334 		if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
335 			/*
336 			 * On a ``band change'' silently drop associated
337 			 * stations as they must re-associate before they
338 			 * can pass traffic (as otherwise protocol state
339 			 * such as capabilities and the negotiated rate
340 			 * set may/will be wrong).
341 			 */
342 			ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
343 		}
344 		break;
345 	default:
346 		break;
347 	}
348 	return 0;
349 }
350 
351 static void
352 hostap_deliver_data(struct ieee80211vap *vap,
353 	struct ieee80211_node *ni, struct mbuf *m)
354 {
355 	struct ether_header *eh = mtod(m, struct ether_header *);
356 	struct ifnet *ifp = vap->iv_ifp;
357 
358 	/* clear driver/net80211 flags before passing up */
359 #if __FreeBSD_version >= 1000046
360 	m->m_flags &= ~(M_MCAST | M_BCAST);
361 	m_clrprotoflags(m);
362 #else
363 	m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
364 #endif
365 
366 	KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
367 	    ("gack, opmode %d", vap->iv_opmode));
368 	/*
369 	 * Do accounting.
370 	 */
371 	ifp->if_ipackets++;
372 	IEEE80211_NODE_STAT(ni, rx_data);
373 	IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
374 	if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
375 		m->m_flags |= M_MCAST;		/* XXX M_BCAST? */
376 		IEEE80211_NODE_STAT(ni, rx_mcast);
377 	} else
378 		IEEE80211_NODE_STAT(ni, rx_ucast);
379 
380 	/* perform as a bridge within the AP */
381 	if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
382 		struct mbuf *mcopy = NULL;
383 
384 		if (m->m_flags & M_MCAST) {
385 			mcopy = m_dup(m, M_NOWAIT);
386 			if (mcopy == NULL)
387 				ifp->if_oerrors++;
388 			else
389 				mcopy->m_flags |= M_MCAST;
390 		} else {
391 			/*
392 			 * Check if the destination is associated with the
393 			 * same vap and authorized to receive traffic.
394 			 * Beware of traffic destined for the vap itself;
395 			 * sending it will not work; just let it be delivered
396 			 * normally.
397 			 */
398 			struct ieee80211_node *sta = ieee80211_find_vap_node(
399 			     &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
400 			if (sta != NULL) {
401 				if (ieee80211_node_is_authorized(sta)) {
402 					/*
403 					 * Beware of sending to ourself; this
404 					 * needs to happen via the normal
405 					 * input path.
406 					 */
407 					if (sta != vap->iv_bss) {
408 						mcopy = m;
409 						m = NULL;
410 					}
411 				} else {
412 					vap->iv_stats.is_rx_unauth++;
413 					IEEE80211_NODE_STAT(sta, rx_unauth);
414 				}
415 				ieee80211_free_node(sta);
416 			}
417 		}
418 		if (mcopy != NULL) {
419 			int len, err;
420 			len = mcopy->m_pkthdr.len;
421 			err = ieee80211_vap_xmitpkt(vap, mcopy);
422 			if (err) {
423 				/* NB: IFQ_HANDOFF reclaims mcopy */
424 			} else {
425 				ifp->if_opackets++;
426 			}
427 		}
428 	}
429 	if (m != NULL) {
430 		/*
431 		 * Mark frame as coming from vap's interface.
432 		 */
433 		m->m_pkthdr.rcvif = ifp;
434 		if (m->m_flags & M_MCAST) {
435 			/*
436 			 * Spam DWDS vap's w/ multicast traffic.
437 			 */
438 			/* XXX only if dwds in use? */
439 			ieee80211_dwds_mcast(vap, m);
440 		}
441 		if (ni->ni_vlan != 0) {
442 			/* attach vlan tag */
443 			m->m_pkthdr.ether_vtag = ni->ni_vlan;
444 			m->m_flags |= M_VLANTAG;
445 		}
446 		ifp->if_input(ifp, m);
447 	}
448 }
449 
450 /*
451  * Decide if a received management frame should be
452  * printed when debugging is enabled.  This filters some
453  * of the less interesting frames that come frequently
454  * (e.g. beacons).
455  */
456 static __inline int
457 doprint(struct ieee80211vap *vap, int subtype)
458 {
459 	switch (subtype) {
460 	case IEEE80211_FC0_SUBTYPE_BEACON:
461 		return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
462 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
463 		return 0;
464 	}
465 	return 1;
466 }
467 
468 /*
469  * Process a received frame.  The node associated with the sender
470  * should be supplied.  If nothing was found in the node table then
471  * the caller is assumed to supply a reference to iv_bss instead.
472  * The RSSI and a timestamp are also supplied.  The RSSI data is used
473  * during AP scanning to select a AP to associate with; it can have
474  * any units so long as values have consistent units and higher values
475  * mean ``better signal''.  The receive timestamp is currently not used
476  * by the 802.11 layer.
477  */
478 static int
479 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
480 {
481 #define	HAS_SEQ(type)	((type & 0x4) == 0)
482 	struct ieee80211vap *vap = ni->ni_vap;
483 	struct ieee80211com *ic = ni->ni_ic;
484 	struct ifnet *ifp = vap->iv_ifp;
485 	struct ieee80211_frame *wh;
486 	struct ieee80211_key *key;
487 	struct ether_header *eh;
488 	int hdrspace, need_tap = 1;	/* mbuf need to be tapped. */
489 	uint8_t dir, type, subtype, qos;
490 	uint8_t *bssid;
491 	uint16_t rxseq;
492 
493 	if (m->m_flags & M_AMPDU_MPDU) {
494 		/*
495 		 * Fastpath for A-MPDU reorder q resubmission.  Frames
496 		 * w/ M_AMPDU_MPDU marked have already passed through
497 		 * here but were received out of order and been held on
498 		 * the reorder queue.  When resubmitted they are marked
499 		 * with the M_AMPDU_MPDU flag and we can bypass most of
500 		 * the normal processing.
501 		 */
502 		wh = mtod(m, struct ieee80211_frame *);
503 		type = IEEE80211_FC0_TYPE_DATA;
504 		dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
505 		subtype = IEEE80211_FC0_SUBTYPE_QOS;
506 		hdrspace = ieee80211_hdrspace(ic, wh);	/* XXX optimize? */
507 		goto resubmit_ampdu;
508 	}
509 
510 	KASSERT(ni != NULL, ("null node"));
511 	ni->ni_inact = ni->ni_inact_reload;
512 
513 	type = -1;			/* undefined */
514 
515 	if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
516 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
517 		    ni->ni_macaddr, NULL,
518 		    "too short (1): len %u", m->m_pkthdr.len);
519 		vap->iv_stats.is_rx_tooshort++;
520 		goto out;
521 	}
522 	/*
523 	 * Bit of a cheat here, we use a pointer for a 3-address
524 	 * frame format but don't reference fields past outside
525 	 * ieee80211_frame_min w/o first validating the data is
526 	 * present.
527 	 */
528 	wh = mtod(m, struct ieee80211_frame *);
529 
530 	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
531 	    IEEE80211_FC0_VERSION_0) {
532 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
533 		    ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
534 		    wh->i_fc[0], wh->i_fc[1]);
535 		vap->iv_stats.is_rx_badversion++;
536 		goto err;
537 	}
538 
539 	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
540 	type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
541 	subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
542 	if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
543 		if (dir != IEEE80211_FC1_DIR_NODS)
544 			bssid = wh->i_addr1;
545 		else if (type == IEEE80211_FC0_TYPE_CTL)
546 			bssid = wh->i_addr1;
547 		else {
548 			if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
549 				IEEE80211_DISCARD_MAC(vap,
550 				    IEEE80211_MSG_ANY, ni->ni_macaddr,
551 				    NULL, "too short (2): len %u",
552 				    m->m_pkthdr.len);
553 				vap->iv_stats.is_rx_tooshort++;
554 				goto out;
555 			}
556 			bssid = wh->i_addr3;
557 		}
558 		/*
559 		 * Validate the bssid.
560 		 */
561 		if (!(type == IEEE80211_FC0_TYPE_MGT &&
562 		      subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
563 		    !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
564 		    !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
565 			/* not interested in */
566 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
567 			    bssid, NULL, "%s", "not to bss");
568 			vap->iv_stats.is_rx_wrongbss++;
569 			goto out;
570 		}
571 
572 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
573 		ni->ni_noise = nf;
574 		if (HAS_SEQ(type)) {
575 			uint8_t tid = ieee80211_gettid(wh);
576 			if (IEEE80211_QOS_HAS_SEQ(wh) &&
577 			    TID_TO_WME_AC(tid) >= WME_AC_VI)
578 				ic->ic_wme.wme_hipri_traffic++;
579 			rxseq = le16toh(*(uint16_t *)wh->i_seq);
580 			if (! ieee80211_check_rxseq(ni, wh)) {
581 				/* duplicate, discard */
582 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
583 				    bssid, "duplicate",
584 				    "seqno <%u,%u> fragno <%u,%u> tid %u",
585 				    rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
586 				    ni->ni_rxseqs[tid] >>
587 					IEEE80211_SEQ_SEQ_SHIFT,
588 				    rxseq & IEEE80211_SEQ_FRAG_MASK,
589 				    ni->ni_rxseqs[tid] &
590 					IEEE80211_SEQ_FRAG_MASK,
591 				    tid);
592 				vap->iv_stats.is_rx_dup++;
593 				IEEE80211_NODE_STAT(ni, rx_dup);
594 				goto out;
595 			}
596 			ni->ni_rxseqs[tid] = rxseq;
597 		}
598 	}
599 
600 	switch (type) {
601 	case IEEE80211_FC0_TYPE_DATA:
602 		hdrspace = ieee80211_hdrspace(ic, wh);
603 		if (m->m_len < hdrspace &&
604 		    (m = m_pullup(m, hdrspace)) == NULL) {
605 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
606 			    ni->ni_macaddr, NULL,
607 			    "data too short: expecting %u", hdrspace);
608 			vap->iv_stats.is_rx_tooshort++;
609 			goto out;		/* XXX */
610 		}
611 		if (!(dir == IEEE80211_FC1_DIR_TODS ||
612 		     (dir == IEEE80211_FC1_DIR_DSTODS &&
613 		      (vap->iv_flags & IEEE80211_F_DWDS)))) {
614 			if (dir != IEEE80211_FC1_DIR_DSTODS) {
615 				IEEE80211_DISCARD(vap,
616 				    IEEE80211_MSG_INPUT, wh, "data",
617 				    "incorrect dir 0x%x", dir);
618 			} else {
619 				IEEE80211_DISCARD(vap,
620 				    IEEE80211_MSG_INPUT |
621 				    IEEE80211_MSG_WDS, wh,
622 				    "4-address data",
623 				    "%s", "DWDS not enabled");
624 			}
625 			vap->iv_stats.is_rx_wrongdir++;
626 			goto out;
627 		}
628 		/* check if source STA is associated */
629 		if (ni == vap->iv_bss) {
630 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
631 			    wh, "data", "%s", "unknown src");
632 			ieee80211_send_error(ni, wh->i_addr2,
633 			    IEEE80211_FC0_SUBTYPE_DEAUTH,
634 			    IEEE80211_REASON_NOT_AUTHED);
635 			vap->iv_stats.is_rx_notassoc++;
636 			goto err;
637 		}
638 		if (ni->ni_associd == 0) {
639 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
640 			    wh, "data", "%s", "unassoc src");
641 			IEEE80211_SEND_MGMT(ni,
642 			    IEEE80211_FC0_SUBTYPE_DISASSOC,
643 			    IEEE80211_REASON_NOT_ASSOCED);
644 			vap->iv_stats.is_rx_notassoc++;
645 			goto err;
646 		}
647 
648 		/*
649 		 * Check for power save state change.
650 		 * XXX out-of-order A-MPDU frames?
651 		 */
652 		if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
653 		    (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
654 			vap->iv_node_ps(ni,
655 				wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
656 		/*
657 		 * For 4-address packets handle WDS discovery
658 		 * notifications.  Once a WDS link is setup frames
659 		 * are just delivered to the WDS vap (see below).
660 		 */
661 		if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
662 			if (!ieee80211_node_is_authorized(ni)) {
663 				IEEE80211_DISCARD(vap,
664 				    IEEE80211_MSG_INPUT |
665 				    IEEE80211_MSG_WDS, wh,
666 				    "4-address data",
667 				    "%s", "unauthorized port");
668 				vap->iv_stats.is_rx_unauth++;
669 				IEEE80211_NODE_STAT(ni, rx_unauth);
670 				goto err;
671 			}
672 			ieee80211_dwds_discover(ni, m);
673 			return type;
674 		}
675 
676 		/*
677 		 * Handle A-MPDU re-ordering.  If the frame is to be
678 		 * processed directly then ieee80211_ampdu_reorder
679 		 * will return 0; otherwise it has consumed the mbuf
680 		 * and we should do nothing more with it.
681 		 */
682 		if ((m->m_flags & M_AMPDU) &&
683 		    ieee80211_ampdu_reorder(ni, m) != 0) {
684 			m = NULL;
685 			goto out;
686 		}
687 	resubmit_ampdu:
688 
689 		/*
690 		 * Handle privacy requirements.  Note that we
691 		 * must not be preempted from here until after
692 		 * we (potentially) call ieee80211_crypto_demic;
693 		 * otherwise we may violate assumptions in the
694 		 * crypto cipher modules used to do delayed update
695 		 * of replay sequence numbers.
696 		 */
697 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
698 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
699 				/*
700 				 * Discard encrypted frames when privacy is off.
701 				 */
702 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
703 				    wh, "WEP", "%s", "PRIVACY off");
704 				vap->iv_stats.is_rx_noprivacy++;
705 				IEEE80211_NODE_STAT(ni, rx_noprivacy);
706 				goto out;
707 			}
708 			key = ieee80211_crypto_decap(ni, m, hdrspace);
709 			if (key == NULL) {
710 				/* NB: stats+msgs handled in crypto_decap */
711 				IEEE80211_NODE_STAT(ni, rx_wepfail);
712 				goto out;
713 			}
714 			wh = mtod(m, struct ieee80211_frame *);
715 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
716 		} else {
717 			/* XXX M_WEP and IEEE80211_F_PRIVACY */
718 			key = NULL;
719 		}
720 
721 		/*
722 		 * Save QoS bits for use below--before we strip the header.
723 		 */
724 		if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
725 			qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
726 			    ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
727 			    ((struct ieee80211_qosframe *)wh)->i_qos[0];
728 		} else
729 			qos = 0;
730 
731 		/*
732 		 * Next up, any fragmentation.
733 		 */
734 		if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
735 			m = ieee80211_defrag(ni, m, hdrspace);
736 			if (m == NULL) {
737 				/* Fragment dropped or frame not complete yet */
738 				goto out;
739 			}
740 		}
741 		wh = NULL;		/* no longer valid, catch any uses */
742 
743 		/*
744 		 * Next strip any MSDU crypto bits.
745 		 */
746 		if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
747 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
748 			    ni->ni_macaddr, "data", "%s", "demic error");
749 			vap->iv_stats.is_rx_demicfail++;
750 			IEEE80211_NODE_STAT(ni, rx_demicfail);
751 			goto out;
752 		}
753 		/* copy to listener after decrypt */
754 		if (ieee80211_radiotap_active_vap(vap))
755 			ieee80211_radiotap_rx(vap, m);
756 		need_tap = 0;
757 		/*
758 		 * Finally, strip the 802.11 header.
759 		 */
760 		m = ieee80211_decap(vap, m, hdrspace);
761 		if (m == NULL) {
762 			/* XXX mask bit to check for both */
763 			/* don't count Null data frames as errors */
764 			if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
765 			    subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
766 				goto out;
767 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
768 			    ni->ni_macaddr, "data", "%s", "decap error");
769 			vap->iv_stats.is_rx_decap++;
770 			IEEE80211_NODE_STAT(ni, rx_decap);
771 			goto err;
772 		}
773 		eh = mtod(m, struct ether_header *);
774 		if (!ieee80211_node_is_authorized(ni)) {
775 			/*
776 			 * Deny any non-PAE frames received prior to
777 			 * authorization.  For open/shared-key
778 			 * authentication the port is mark authorized
779 			 * after authentication completes.  For 802.1x
780 			 * the port is not marked authorized by the
781 			 * authenticator until the handshake has completed.
782 			 */
783 			if (eh->ether_type != htons(ETHERTYPE_PAE)) {
784 				IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
785 				    eh->ether_shost, "data",
786 				    "unauthorized port: ether type 0x%x len %u",
787 				    eh->ether_type, m->m_pkthdr.len);
788 				vap->iv_stats.is_rx_unauth++;
789 				IEEE80211_NODE_STAT(ni, rx_unauth);
790 				goto err;
791 			}
792 		} else {
793 			/*
794 			 * When denying unencrypted frames, discard
795 			 * any non-PAE frames received without encryption.
796 			 */
797 			if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
798 			    (key == NULL && (m->m_flags & M_WEP) == 0) &&
799 			    eh->ether_type != htons(ETHERTYPE_PAE)) {
800 				/*
801 				 * Drop unencrypted frames.
802 				 */
803 				vap->iv_stats.is_rx_unencrypted++;
804 				IEEE80211_NODE_STAT(ni, rx_unencrypted);
805 				goto out;
806 			}
807 		}
808 		/* XXX require HT? */
809 		if (qos & IEEE80211_QOS_AMSDU) {
810 			m = ieee80211_decap_amsdu(ni, m);
811 			if (m == NULL)
812 				return IEEE80211_FC0_TYPE_DATA;
813 		} else {
814 #ifdef IEEE80211_SUPPORT_SUPERG
815 			m = ieee80211_decap_fastframe(vap, ni, m);
816 			if (m == NULL)
817 				return IEEE80211_FC0_TYPE_DATA;
818 #endif
819 		}
820 		if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
821 			ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
822 		else
823 			hostap_deliver_data(vap, ni, m);
824 		return IEEE80211_FC0_TYPE_DATA;
825 
826 	case IEEE80211_FC0_TYPE_MGT:
827 		vap->iv_stats.is_rx_mgmt++;
828 		IEEE80211_NODE_STAT(ni, rx_mgmt);
829 		if (dir != IEEE80211_FC1_DIR_NODS) {
830 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
831 			    wh, "mgt", "incorrect dir 0x%x", dir);
832 			vap->iv_stats.is_rx_wrongdir++;
833 			goto err;
834 		}
835 		if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
836 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
837 			    ni->ni_macaddr, "mgt", "too short: len %u",
838 			    m->m_pkthdr.len);
839 			vap->iv_stats.is_rx_tooshort++;
840 			goto out;
841 		}
842 		if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
843 			/* ensure return frames are unicast */
844 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
845 			    wh, NULL, "source is multicast: %s",
846 			    ether_sprintf(wh->i_addr2));
847 			vap->iv_stats.is_rx_mgtdiscard++;	/* XXX stat */
848 			goto out;
849 		}
850 #ifdef IEEE80211_DEBUG
851 		if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
852 		    ieee80211_msg_dumppkts(vap)) {
853 			if_printf(ifp, "received %s from %s rssi %d\n",
854 			    ieee80211_mgt_subtype_name[subtype >>
855 				IEEE80211_FC0_SUBTYPE_SHIFT],
856 			    ether_sprintf(wh->i_addr2), rssi);
857 		}
858 #endif
859 		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
860 			if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
861 				/*
862 				 * Only shared key auth frames with a challenge
863 				 * should be encrypted, discard all others.
864 				 */
865 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
866 				    wh, NULL,
867 				    "%s", "WEP set but not permitted");
868 				vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
869 				goto out;
870 			}
871 			if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
872 				/*
873 				 * Discard encrypted frames when privacy is off.
874 				 */
875 				IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
876 				    wh, NULL, "%s", "WEP set but PRIVACY off");
877 				vap->iv_stats.is_rx_noprivacy++;
878 				goto out;
879 			}
880 			hdrspace = ieee80211_hdrspace(ic, wh);
881 			key = ieee80211_crypto_decap(ni, m, hdrspace);
882 			if (key == NULL) {
883 				/* NB: stats+msgs handled in crypto_decap */
884 				goto out;
885 			}
886 			wh = mtod(m, struct ieee80211_frame *);
887 			wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
888 		}
889 		/*
890 		 * Pass the packet to radiotap before calling iv_recv_mgmt().
891 		 * Otherwise iv_recv_mgmt() might pass another packet to
892 		 * radiotap, resulting in out of order packet captures.
893 		 */
894 		if (ieee80211_radiotap_active_vap(vap))
895 			ieee80211_radiotap_rx(vap, m);
896 		need_tap = 0;
897 		vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
898 		goto out;
899 
900 	case IEEE80211_FC0_TYPE_CTL:
901 		vap->iv_stats.is_rx_ctl++;
902 		IEEE80211_NODE_STAT(ni, rx_ctrl);
903 		vap->iv_recv_ctl(ni, m, subtype);
904 		goto out;
905 	default:
906 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
907 		    wh, "bad", "frame type 0x%x", type);
908 		/* should not come here */
909 		break;
910 	}
911 err:
912 	ifp->if_ierrors++;
913 out:
914 	if (m != NULL) {
915 		if (need_tap && ieee80211_radiotap_active_vap(vap))
916 			ieee80211_radiotap_rx(vap, m);
917 		m_freem(m);
918 	}
919 	return type;
920 }
921 
922 static void
923 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
924     int rssi, int nf, uint16_t seq, uint16_t status)
925 {
926 	struct ieee80211vap *vap = ni->ni_vap;
927 
928 	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
929 
930 	if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
931 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
932 		    ni->ni_macaddr, "open auth",
933 		    "bad sta auth mode %u", ni->ni_authmode);
934 		vap->iv_stats.is_rx_bad_auth++;	/* XXX */
935 		/*
936 		 * Clear any challenge text that may be there if
937 		 * a previous shared key auth failed and then an
938 		 * open auth is attempted.
939 		 */
940 		if (ni->ni_challenge != NULL) {
941 			free(ni->ni_challenge, M_80211_NODE);
942 			ni->ni_challenge = NULL;
943 		}
944 		/* XXX hack to workaround calling convention */
945 		ieee80211_send_error(ni, wh->i_addr2,
946 		    IEEE80211_FC0_SUBTYPE_AUTH,
947 		    (seq + 1) | (IEEE80211_STATUS_ALG<<16));
948 		return;
949 	}
950 	if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
951 		vap->iv_stats.is_rx_bad_auth++;
952 		return;
953 	}
954 	/* always accept open authentication requests */
955 	if (ni == vap->iv_bss) {
956 		ni = ieee80211_dup_bss(vap, wh->i_addr2);
957 		if (ni == NULL)
958 			return;
959 	} else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
960 		(void) ieee80211_ref_node(ni);
961 	/*
962 	 * Mark the node as referenced to reflect that it's
963 	 * reference count has been bumped to insure it remains
964 	 * after the transaction completes.
965 	 */
966 	ni->ni_flags |= IEEE80211_NODE_AREF;
967 	/*
968 	 * Mark the node as requiring a valid association id
969 	 * before outbound traffic is permitted.
970 	 */
971 	ni->ni_flags |= IEEE80211_NODE_ASSOCID;
972 
973 	if (vap->iv_acl != NULL &&
974 	    vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
975 		/*
976 		 * When the ACL policy is set to RADIUS we defer the
977 		 * authorization to a user agent.  Dispatch an event,
978 		 * a subsequent MLME call will decide the fate of the
979 		 * station.  If the user agent is not present then the
980 		 * node will be reclaimed due to inactivity.
981 		 */
982 		IEEE80211_NOTE_MAC(vap,
983 		    IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
984 		    "%s", "station authentication defered (radius acl)");
985 		ieee80211_notify_node_auth(ni);
986 	} else {
987 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
988 		IEEE80211_NOTE_MAC(vap,
989 		    IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
990 		    "%s", "station authenticated (open)");
991 		/*
992 		 * When 802.1x is not in use mark the port
993 		 * authorized at this point so traffic can flow.
994 		 */
995 		if (ni->ni_authmode != IEEE80211_AUTH_8021X)
996 			ieee80211_node_authorize(ni);
997 	}
998 }
999 
1000 static void
1001 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1002     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1003     uint16_t seq, uint16_t status)
1004 {
1005 	struct ieee80211vap *vap = ni->ni_vap;
1006 	uint8_t *challenge;
1007 	int allocbs, estatus;
1008 
1009 	KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1010 
1011 	/*
1012 	 * NB: this can happen as we allow pre-shared key
1013 	 * authentication to be enabled w/o wep being turned
1014 	 * on so that configuration of these can be done
1015 	 * in any order.  It may be better to enforce the
1016 	 * ordering in which case this check would just be
1017 	 * for sanity/consistency.
1018 	 */
1019 	if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1020 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1021 		    ni->ni_macaddr, "shared key auth",
1022 		    "%s", " PRIVACY is disabled");
1023 		estatus = IEEE80211_STATUS_ALG;
1024 		goto bad;
1025 	}
1026 	/*
1027 	 * Pre-shared key authentication is evil; accept
1028 	 * it only if explicitly configured (it is supported
1029 	 * mainly for compatibility with clients like Mac OS X).
1030 	 */
1031 	if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1032 	    ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1033 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1034 		    ni->ni_macaddr, "shared key auth",
1035 		    "bad sta auth mode %u", ni->ni_authmode);
1036 		vap->iv_stats.is_rx_bad_auth++;	/* XXX maybe a unique error? */
1037 		estatus = IEEE80211_STATUS_ALG;
1038 		goto bad;
1039 	}
1040 
1041 	challenge = NULL;
1042 	if (frm + 1 < efrm) {
1043 		if ((frm[1] + 2) > (efrm - frm)) {
1044 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1045 			    ni->ni_macaddr, "shared key auth",
1046 			    "ie %d/%d too long",
1047 			    frm[0], (frm[1] + 2) - (efrm - frm));
1048 			vap->iv_stats.is_rx_bad_auth++;
1049 			estatus = IEEE80211_STATUS_CHALLENGE;
1050 			goto bad;
1051 		}
1052 		if (*frm == IEEE80211_ELEMID_CHALLENGE)
1053 			challenge = frm;
1054 		frm += frm[1] + 2;
1055 	}
1056 	switch (seq) {
1057 	case IEEE80211_AUTH_SHARED_CHALLENGE:
1058 	case IEEE80211_AUTH_SHARED_RESPONSE:
1059 		if (challenge == NULL) {
1060 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1061 			    ni->ni_macaddr, "shared key auth",
1062 			    "%s", "no challenge");
1063 			vap->iv_stats.is_rx_bad_auth++;
1064 			estatus = IEEE80211_STATUS_CHALLENGE;
1065 			goto bad;
1066 		}
1067 		if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1068 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1069 			    ni->ni_macaddr, "shared key auth",
1070 			    "bad challenge len %d", challenge[1]);
1071 			vap->iv_stats.is_rx_bad_auth++;
1072 			estatus = IEEE80211_STATUS_CHALLENGE;
1073 			goto bad;
1074 		}
1075 	default:
1076 		break;
1077 	}
1078 	switch (seq) {
1079 	case IEEE80211_AUTH_SHARED_REQUEST:
1080 		if (ni == vap->iv_bss) {
1081 			ni = ieee80211_dup_bss(vap, wh->i_addr2);
1082 			if (ni == NULL) {
1083 				/* NB: no way to return an error */
1084 				return;
1085 			}
1086 			allocbs = 1;
1087 		} else {
1088 			if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1089 				(void) ieee80211_ref_node(ni);
1090 			allocbs = 0;
1091 		}
1092 		/*
1093 		 * Mark the node as referenced to reflect that it's
1094 		 * reference count has been bumped to insure it remains
1095 		 * after the transaction completes.
1096 		 */
1097 		ni->ni_flags |= IEEE80211_NODE_AREF;
1098 		/*
1099 		 * Mark the node as requiring a valid associatio id
1100 		 * before outbound traffic is permitted.
1101 		 */
1102 		ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1103 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1104 		ni->ni_noise = nf;
1105 		if (!ieee80211_alloc_challenge(ni)) {
1106 			/* NB: don't return error so they rexmit */
1107 			return;
1108 		}
1109 		get_random_bytes(ni->ni_challenge,
1110 			IEEE80211_CHALLENGE_LEN);
1111 		IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1112 		    ni, "shared key %sauth request", allocbs ? "" : "re");
1113 		/*
1114 		 * When the ACL policy is set to RADIUS we defer the
1115 		 * authorization to a user agent.  Dispatch an event,
1116 		 * a subsequent MLME call will decide the fate of the
1117 		 * station.  If the user agent is not present then the
1118 		 * node will be reclaimed due to inactivity.
1119 		 */
1120 		if (vap->iv_acl != NULL &&
1121 		    vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1122 			IEEE80211_NOTE_MAC(vap,
1123 			    IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1124 			    ni->ni_macaddr,
1125 			    "%s", "station authentication defered (radius acl)");
1126 			ieee80211_notify_node_auth(ni);
1127 			return;
1128 		}
1129 		break;
1130 	case IEEE80211_AUTH_SHARED_RESPONSE:
1131 		if (ni == vap->iv_bss) {
1132 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1133 			    ni->ni_macaddr, "shared key response",
1134 			    "%s", "unknown station");
1135 			/* NB: don't send a response */
1136 			return;
1137 		}
1138 		if (ni->ni_challenge == NULL) {
1139 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1140 			    ni->ni_macaddr, "shared key response",
1141 			    "%s", "no challenge recorded");
1142 			vap->iv_stats.is_rx_bad_auth++;
1143 			estatus = IEEE80211_STATUS_CHALLENGE;
1144 			goto bad;
1145 		}
1146 		if (memcmp(ni->ni_challenge, &challenge[2],
1147 			   challenge[1]) != 0) {
1148 			IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1149 			    ni->ni_macaddr, "shared key response",
1150 			    "%s", "challenge mismatch");
1151 			vap->iv_stats.is_rx_auth_fail++;
1152 			estatus = IEEE80211_STATUS_CHALLENGE;
1153 			goto bad;
1154 		}
1155 		IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1156 		    ni, "%s", "station authenticated (shared key)");
1157 		ieee80211_node_authorize(ni);
1158 		break;
1159 	default:
1160 		IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1161 		    ni->ni_macaddr, "shared key auth",
1162 		    "bad seq %d", seq);
1163 		vap->iv_stats.is_rx_bad_auth++;
1164 		estatus = IEEE80211_STATUS_SEQUENCE;
1165 		goto bad;
1166 	}
1167 	IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1168 	return;
1169 bad:
1170 	/*
1171 	 * Send an error response; but only when operating as an AP.
1172 	 */
1173 	/* XXX hack to workaround calling convention */
1174 	ieee80211_send_error(ni, wh->i_addr2,
1175 	    IEEE80211_FC0_SUBTYPE_AUTH,
1176 	    (seq + 1) | (estatus<<16));
1177 }
1178 
1179 /*
1180  * Convert a WPA cipher selector OUI to an internal
1181  * cipher algorithm.  Where appropriate we also
1182  * record any key length.
1183  */
1184 static int
1185 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1186 {
1187 #define	WPA_SEL(x)	(((x)<<24)|WPA_OUI)
1188 	uint32_t w = LE_READ_4(sel);
1189 
1190 	switch (w) {
1191 	case WPA_SEL(WPA_CSE_NULL):
1192 		return IEEE80211_CIPHER_NONE;
1193 	case WPA_SEL(WPA_CSE_WEP40):
1194 		if (keylen)
1195 			*keylen = 40 / NBBY;
1196 		return IEEE80211_CIPHER_WEP;
1197 	case WPA_SEL(WPA_CSE_WEP104):
1198 		if (keylen)
1199 			*keylen = 104 / NBBY;
1200 		return IEEE80211_CIPHER_WEP;
1201 	case WPA_SEL(WPA_CSE_TKIP):
1202 		return IEEE80211_CIPHER_TKIP;
1203 	case WPA_SEL(WPA_CSE_CCMP):
1204 		return IEEE80211_CIPHER_AES_CCM;
1205 	}
1206 	return 32;		/* NB: so 1<< is discarded */
1207 #undef WPA_SEL
1208 }
1209 
1210 /*
1211  * Convert a WPA key management/authentication algorithm
1212  * to an internal code.
1213  */
1214 static int
1215 wpa_keymgmt(const uint8_t *sel)
1216 {
1217 #define	WPA_SEL(x)	(((x)<<24)|WPA_OUI)
1218 	uint32_t w = LE_READ_4(sel);
1219 
1220 	switch (w) {
1221 	case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1222 		return WPA_ASE_8021X_UNSPEC;
1223 	case WPA_SEL(WPA_ASE_8021X_PSK):
1224 		return WPA_ASE_8021X_PSK;
1225 	case WPA_SEL(WPA_ASE_NONE):
1226 		return WPA_ASE_NONE;
1227 	}
1228 	return 0;		/* NB: so is discarded */
1229 #undef WPA_SEL
1230 }
1231 
1232 /*
1233  * Parse a WPA information element to collect parameters.
1234  * Note that we do not validate security parameters; that
1235  * is handled by the authenticator; the parsing done here
1236  * is just for internal use in making operational decisions.
1237  */
1238 static int
1239 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1240 	struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1241 {
1242 	uint8_t len = frm[1];
1243 	uint32_t w;
1244 	int n;
1245 
1246 	/*
1247 	 * Check the length once for fixed parts: OUI, type,
1248 	 * version, mcast cipher, and 2 selector counts.
1249 	 * Other, variable-length data, must be checked separately.
1250 	 */
1251 	if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1252 		IEEE80211_DISCARD_IE(vap,
1253 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1254 		    wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1255 		return IEEE80211_REASON_IE_INVALID;
1256 	}
1257 	if (len < 14) {
1258 		IEEE80211_DISCARD_IE(vap,
1259 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1260 		    wh, "WPA", "too short, len %u", len);
1261 		return IEEE80211_REASON_IE_INVALID;
1262 	}
1263 	frm += 6, len -= 4;		/* NB: len is payload only */
1264 	/* NB: iswpaoui already validated the OUI and type */
1265 	w = LE_READ_2(frm);
1266 	if (w != WPA_VERSION) {
1267 		IEEE80211_DISCARD_IE(vap,
1268 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1269 		    wh, "WPA", "bad version %u", w);
1270 		return IEEE80211_REASON_IE_INVALID;
1271 	}
1272 	frm += 2, len -= 2;
1273 
1274 	memset(rsn, 0, sizeof(*rsn));
1275 
1276 	/* multicast/group cipher */
1277 	rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1278 	frm += 4, len -= 4;
1279 
1280 	/* unicast ciphers */
1281 	n = LE_READ_2(frm);
1282 	frm += 2, len -= 2;
1283 	if (len < n*4+2) {
1284 		IEEE80211_DISCARD_IE(vap,
1285 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1286 		    wh, "WPA", "ucast cipher data too short; len %u, n %u",
1287 		    len, n);
1288 		return IEEE80211_REASON_IE_INVALID;
1289 	}
1290 	w = 0;
1291 	for (; n > 0; n--) {
1292 		w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1293 		frm += 4, len -= 4;
1294 	}
1295 	if (w & (1<<IEEE80211_CIPHER_TKIP))
1296 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1297 	else
1298 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1299 
1300 	/* key management algorithms */
1301 	n = LE_READ_2(frm);
1302 	frm += 2, len -= 2;
1303 	if (len < n*4) {
1304 		IEEE80211_DISCARD_IE(vap,
1305 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1306 		    wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1307 		    len, n);
1308 		return IEEE80211_REASON_IE_INVALID;
1309 	}
1310 	w = 0;
1311 	for (; n > 0; n--) {
1312 		w |= wpa_keymgmt(frm);
1313 		frm += 4, len -= 4;
1314 	}
1315 	if (w & WPA_ASE_8021X_UNSPEC)
1316 		rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1317 	else
1318 		rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1319 
1320 	if (len > 2)		/* optional capabilities */
1321 		rsn->rsn_caps = LE_READ_2(frm);
1322 
1323 	return 0;
1324 }
1325 
1326 /*
1327  * Convert an RSN cipher selector OUI to an internal
1328  * cipher algorithm.  Where appropriate we also
1329  * record any key length.
1330  */
1331 static int
1332 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1333 {
1334 #define	RSN_SEL(x)	(((x)<<24)|RSN_OUI)
1335 	uint32_t w = LE_READ_4(sel);
1336 
1337 	switch (w) {
1338 	case RSN_SEL(RSN_CSE_NULL):
1339 		return IEEE80211_CIPHER_NONE;
1340 	case RSN_SEL(RSN_CSE_WEP40):
1341 		if (keylen)
1342 			*keylen = 40 / NBBY;
1343 		return IEEE80211_CIPHER_WEP;
1344 	case RSN_SEL(RSN_CSE_WEP104):
1345 		if (keylen)
1346 			*keylen = 104 / NBBY;
1347 		return IEEE80211_CIPHER_WEP;
1348 	case RSN_SEL(RSN_CSE_TKIP):
1349 		return IEEE80211_CIPHER_TKIP;
1350 	case RSN_SEL(RSN_CSE_CCMP):
1351 		return IEEE80211_CIPHER_AES_CCM;
1352 	case RSN_SEL(RSN_CSE_WRAP):
1353 		return IEEE80211_CIPHER_AES_OCB;
1354 	}
1355 	return 32;		/* NB: so 1<< is discarded */
1356 #undef WPA_SEL
1357 }
1358 
1359 /*
1360  * Convert an RSN key management/authentication algorithm
1361  * to an internal code.
1362  */
1363 static int
1364 rsn_keymgmt(const uint8_t *sel)
1365 {
1366 #define	RSN_SEL(x)	(((x)<<24)|RSN_OUI)
1367 	uint32_t w = LE_READ_4(sel);
1368 
1369 	switch (w) {
1370 	case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1371 		return RSN_ASE_8021X_UNSPEC;
1372 	case RSN_SEL(RSN_ASE_8021X_PSK):
1373 		return RSN_ASE_8021X_PSK;
1374 	case RSN_SEL(RSN_ASE_NONE):
1375 		return RSN_ASE_NONE;
1376 	}
1377 	return 0;		/* NB: so is discarded */
1378 #undef RSN_SEL
1379 }
1380 
1381 /*
1382  * Parse a WPA/RSN information element to collect parameters
1383  * and validate the parameters against what has been
1384  * configured for the system.
1385  */
1386 static int
1387 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1388 	struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1389 {
1390 	uint8_t len = frm[1];
1391 	uint32_t w;
1392 	int n;
1393 
1394 	/*
1395 	 * Check the length once for fixed parts:
1396 	 * version, mcast cipher, and 2 selector counts.
1397 	 * Other, variable-length data, must be checked separately.
1398 	 */
1399 	if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1400 		IEEE80211_DISCARD_IE(vap,
1401 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1402 		    wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1403 		return IEEE80211_REASON_IE_INVALID;
1404 	}
1405 	if (len < 10) {
1406 		IEEE80211_DISCARD_IE(vap,
1407 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1408 		    wh, "RSN", "too short, len %u", len);
1409 		return IEEE80211_REASON_IE_INVALID;
1410 	}
1411 	frm += 2;
1412 	w = LE_READ_2(frm);
1413 	if (w != RSN_VERSION) {
1414 		IEEE80211_DISCARD_IE(vap,
1415 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1416 		    wh, "RSN", "bad version %u", w);
1417 		return IEEE80211_REASON_IE_INVALID;
1418 	}
1419 	frm += 2, len -= 2;
1420 
1421 	memset(rsn, 0, sizeof(*rsn));
1422 
1423 	/* multicast/group cipher */
1424 	rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1425 	frm += 4, len -= 4;
1426 
1427 	/* unicast ciphers */
1428 	n = LE_READ_2(frm);
1429 	frm += 2, len -= 2;
1430 	if (len < n*4+2) {
1431 		IEEE80211_DISCARD_IE(vap,
1432 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1433 		    wh, "RSN", "ucast cipher data too short; len %u, n %u",
1434 		    len, n);
1435 		return IEEE80211_REASON_IE_INVALID;
1436 	}
1437 	w = 0;
1438 	for (; n > 0; n--) {
1439 		w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1440 		frm += 4, len -= 4;
1441 	}
1442 	if (w & (1<<IEEE80211_CIPHER_TKIP))
1443 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1444 	else
1445 		rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1446 
1447 	/* key management algorithms */
1448 	n = LE_READ_2(frm);
1449 	frm += 2, len -= 2;
1450 	if (len < n*4) {
1451 		IEEE80211_DISCARD_IE(vap,
1452 		    IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1453 		    wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1454 		    len, n);
1455 		return IEEE80211_REASON_IE_INVALID;
1456 	}
1457 	w = 0;
1458 	for (; n > 0; n--) {
1459 		w |= rsn_keymgmt(frm);
1460 		frm += 4, len -= 4;
1461 	}
1462 	if (w & RSN_ASE_8021X_UNSPEC)
1463 		rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1464 	else
1465 		rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1466 
1467 	/* optional RSN capabilities */
1468 	if (len > 2)
1469 		rsn->rsn_caps = LE_READ_2(frm);
1470 	/* XXXPMKID */
1471 
1472 	return 0;
1473 }
1474 
1475 /*
1476  * WPA/802.11i assocation request processing.
1477  */
1478 static int
1479 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1480 	const struct ieee80211_frame *wh, const uint8_t *wpa,
1481 	const uint8_t *rsn, uint16_t capinfo)
1482 {
1483 	struct ieee80211vap *vap = ni->ni_vap;
1484 	uint8_t reason;
1485 	int badwparsn;
1486 
1487 	ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1488 	if (wpa == NULL && rsn == NULL) {
1489 		if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1490 			/*
1491 			 * W-Fi Protected Setup (WPS) permits
1492 			 * clients to associate and pass EAPOL frames
1493 			 * to establish initial credentials.
1494 			 */
1495 			ni->ni_flags |= IEEE80211_NODE_WPS;
1496 			return 1;
1497 		}
1498 		if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1499 		    (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1500 			/*
1501 			 * Transitional Security Network.  Permits clients
1502 			 * to associate and use WEP while WPA is configured.
1503 			 */
1504 			ni->ni_flags |= IEEE80211_NODE_TSN;
1505 			return 1;
1506 		}
1507 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1508 		    wh, NULL, "%s", "no WPA/RSN IE in association request");
1509 		vap->iv_stats.is_rx_assoc_badwpaie++;
1510 		reason = IEEE80211_REASON_IE_INVALID;
1511 		goto bad;
1512 	}
1513 	/* assert right association security credentials */
1514 	badwparsn = 0;			/* NB: to silence compiler */
1515 	switch (vap->iv_flags & IEEE80211_F_WPA) {
1516 	case IEEE80211_F_WPA1:
1517 		badwparsn = (wpa == NULL);
1518 		break;
1519 	case IEEE80211_F_WPA2:
1520 		badwparsn = (rsn == NULL);
1521 		break;
1522 	case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1523 		badwparsn = (wpa == NULL && rsn == NULL);
1524 		break;
1525 	}
1526 	if (badwparsn) {
1527 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1528 		    wh, NULL,
1529 		    "%s", "missing WPA/RSN IE in association request");
1530 		vap->iv_stats.is_rx_assoc_badwpaie++;
1531 		reason = IEEE80211_REASON_IE_INVALID;
1532 		goto bad;
1533 	}
1534 	/*
1535 	 * Parse WPA/RSN information element.
1536 	 */
1537 	if (wpa != NULL)
1538 		reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1539 	else
1540 		reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1541 	if (reason != 0) {
1542 		/* XXX distinguish WPA/RSN? */
1543 		vap->iv_stats.is_rx_assoc_badwpaie++;
1544 		goto bad;
1545 	}
1546 	IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1547 	    "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1548 	    wpa != NULL ? "WPA" : "RSN",
1549 	    rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1550 	    rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1551 	    rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1552 
1553 	return 1;
1554 bad:
1555 	ieee80211_node_deauth(ni, reason);
1556 	return 0;
1557 }
1558 
1559 /* XXX find a better place for definition */
1560 struct l2_update_frame {
1561 	struct ether_header eh;
1562 	uint8_t dsap;
1563 	uint8_t ssap;
1564 	uint8_t control;
1565 	uint8_t xid[3];
1566 }  __packed;
1567 
1568 /*
1569  * Deliver a TGf L2UF frame on behalf of a station.
1570  * This primes any bridge when the station is roaming
1571  * between ap's on the same wired network.
1572  */
1573 static void
1574 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1575 {
1576 	struct ieee80211vap *vap = ni->ni_vap;
1577 	struct ifnet *ifp = vap->iv_ifp;
1578 	struct mbuf *m;
1579 	struct l2_update_frame *l2uf;
1580 	struct ether_header *eh;
1581 
1582 	m = m_gethdr(M_NOWAIT, MT_DATA);
1583 	if (m == NULL) {
1584 		IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1585 		    "%s", "no mbuf for l2uf frame");
1586 		vap->iv_stats.is_rx_nobuf++;	/* XXX not right */
1587 		return;
1588 	}
1589 	l2uf = mtod(m, struct l2_update_frame *);
1590 	eh = &l2uf->eh;
1591 	/* dst: Broadcast address */
1592 	IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1593 	/* src: associated STA */
1594 	IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1595 	eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1596 
1597 	l2uf->dsap = 0;
1598 	l2uf->ssap = 0;
1599 	l2uf->control = 0xf5;
1600 	l2uf->xid[0] = 0x81;
1601 	l2uf->xid[1] = 0x80;
1602 	l2uf->xid[2] = 0x00;
1603 
1604 	m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1605 	hostap_deliver_data(vap, ni, m);
1606 }
1607 
1608 static void
1609 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1610 	int reassoc, int resp, const char *tag, int rate)
1611 {
1612 	IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1613 	    "deny %s request, %s rate set mismatch, rate/MCS %d",
1614 	    reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1615 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1616 	ieee80211_node_leave(ni);
1617 }
1618 
1619 static void
1620 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1621 	int reassoc, int resp, const char *tag, int capinfo)
1622 {
1623 	struct ieee80211vap *vap = ni->ni_vap;
1624 
1625 	IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1626 	    "deny %s request, %s mismatch 0x%x",
1627 	    reassoc ? "reassoc" : "assoc", tag, capinfo);
1628 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1629 	ieee80211_node_leave(ni);
1630 	vap->iv_stats.is_rx_assoc_capmismatch++;
1631 }
1632 
1633 static void
1634 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1635 	int reassoc, int resp)
1636 {
1637 	IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1638 	    "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1639 	/* XXX no better code */
1640 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1641 	ieee80211_node_leave(ni);
1642 }
1643 
1644 static void
1645 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1646 	int algo, int seq, int status)
1647 {
1648 	struct ieee80211vap *vap = ni->ni_vap;
1649 
1650 	IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1651 	    wh, NULL, "unsupported alg %d", algo);
1652 	vap->iv_stats.is_rx_auth_unsupported++;
1653 	ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1654 	    seq | (status << 16));
1655 }
1656 
1657 static __inline int
1658 ishtmixed(const uint8_t *ie)
1659 {
1660 	const struct ieee80211_ie_htinfo *ht =
1661 	    (const struct ieee80211_ie_htinfo *) ie;
1662 	return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1663 	    IEEE80211_HTINFO_OPMODE_MIXED;
1664 }
1665 
1666 static int
1667 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1668 {
1669 	static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1670 	int i;
1671 
1672 	/* NB: the 11b clients we care about will not have xrates */
1673 	if (xrates != NULL || rates == NULL)
1674 		return 0;
1675 	for (i = 0; i < rates[1]; i++) {
1676 		int r = rates[2+i] & IEEE80211_RATE_VAL;
1677 		if (r > 2*11 || ((1<<r) & brates) == 0)
1678 			return 0;
1679 	}
1680 	return 1;
1681 }
1682 
1683 static void
1684 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1685 	int subtype, int rssi, int nf)
1686 {
1687 	struct ieee80211vap *vap = ni->ni_vap;
1688 	struct ieee80211com *ic = ni->ni_ic;
1689 	struct ieee80211_frame *wh;
1690 	uint8_t *frm, *efrm, *sfrm;
1691 	uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1692 	int reassoc, resp;
1693 	uint8_t rate;
1694 
1695 	wh = mtod(m0, struct ieee80211_frame *);
1696 	frm = (uint8_t *)&wh[1];
1697 	efrm = mtod(m0, uint8_t *) + m0->m_len;
1698 	switch (subtype) {
1699 	case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1700 	case IEEE80211_FC0_SUBTYPE_BEACON: {
1701 		struct ieee80211_scanparams scan;
1702 		/*
1703 		 * We process beacon/probe response frames when scanning;
1704 		 * otherwise we check beacon frames for overlapping non-ERP
1705 		 * BSS in 11g and/or overlapping legacy BSS when in HT.
1706 		 */
1707 		if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1708 		    subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1709 			vap->iv_stats.is_rx_mgtdiscard++;
1710 			return;
1711 		}
1712 		/* NB: accept off-channel frames */
1713 		if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1714 			return;
1715 		/*
1716 		 * Count frame now that we know it's to be processed.
1717 		 */
1718 		if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1719 			vap->iv_stats.is_rx_beacon++;		/* XXX remove */
1720 			IEEE80211_NODE_STAT(ni, rx_beacons);
1721 		} else
1722 			IEEE80211_NODE_STAT(ni, rx_proberesp);
1723 		/*
1724 		 * If scanning, just pass information to the scan module.
1725 		 */
1726 		if (ic->ic_flags & IEEE80211_F_SCAN) {
1727 			if (scan.status == 0 &&		/* NB: on channel */
1728 			    (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1729 				/*
1730 				 * Actively scanning a channel marked passive;
1731 				 * send a probe request now that we know there
1732 				 * is 802.11 traffic present.
1733 				 *
1734 				 * XXX check if the beacon we recv'd gives
1735 				 * us what we need and suppress the probe req
1736 				 */
1737 				ieee80211_probe_curchan(vap, 1);
1738 				ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1739 			}
1740 			ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1741 			return;
1742 		}
1743 		/*
1744 		 * Check beacon for overlapping bss w/ non ERP stations.
1745 		 * If we detect one and protection is configured but not
1746 		 * enabled, enable it and start a timer that'll bring us
1747 		 * out if we stop seeing the bss.
1748 		 */
1749 		if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1750 		    scan.status == 0 &&			/* NB: on-channel */
1751 		    ((scan.erp & 0x100) == 0 ||		/* NB: no ERP, 11b sta*/
1752 		     (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1753 			ic->ic_lastnonerp = ticks;
1754 			ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1755 			if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1756 			    (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1757 				IEEE80211_NOTE_FRAME(vap,
1758 				    IEEE80211_MSG_ASSOC, wh,
1759 				    "non-ERP present on channel %d "
1760 				    "(saw erp 0x%x from channel %d), "
1761 				    "enable use of protection",
1762 				    ic->ic_curchan->ic_ieee,
1763 				    scan.erp, scan.chan);
1764 				ic->ic_flags |= IEEE80211_F_USEPROT;
1765 				ieee80211_notify_erp(ic);
1766 			}
1767 		}
1768 		/*
1769 		 * Check beacon for non-HT station on HT channel
1770 		 * and update HT BSS occupancy as appropriate.
1771 		 */
1772 		if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1773 			if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1774 				/*
1775 				 * Off control channel; only check frames
1776 				 * that come in the extension channel when
1777 				 * operating w/ HT40.
1778 				 */
1779 				if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1780 					break;
1781 				if (scan.chan != ic->ic_curchan->ic_extieee)
1782 					break;
1783 			}
1784 			if (scan.htinfo == NULL) {
1785 				ieee80211_htprot_update(ic,
1786 				    IEEE80211_HTINFO_OPMODE_PROTOPT |
1787 				    IEEE80211_HTINFO_NONHT_PRESENT);
1788 			} else if (ishtmixed(scan.htinfo)) {
1789 				/* XXX? take NONHT_PRESENT from beacon? */
1790 				ieee80211_htprot_update(ic,
1791 				    IEEE80211_HTINFO_OPMODE_MIXED |
1792 				    IEEE80211_HTINFO_NONHT_PRESENT);
1793 			}
1794 		}
1795 		break;
1796 	}
1797 
1798 	case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1799 		if (vap->iv_state != IEEE80211_S_RUN) {
1800 			vap->iv_stats.is_rx_mgtdiscard++;
1801 			return;
1802 		}
1803 		/*
1804 		 * Consult the ACL policy module if setup.
1805 		 */
1806 		if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1807 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1808 			    wh, NULL, "%s", "disallowed by ACL");
1809 			vap->iv_stats.is_rx_acl++;
1810 			return;
1811 		}
1812 		/*
1813 		 * prreq frame format
1814 		 *	[tlv] ssid
1815 		 *	[tlv] supported rates
1816 		 *	[tlv] extended supported rates
1817 		 */
1818 		ssid = rates = xrates = NULL;
1819 		sfrm = frm;
1820 		while (efrm - frm > 1) {
1821 			IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1822 			switch (*frm) {
1823 			case IEEE80211_ELEMID_SSID:
1824 				ssid = frm;
1825 				break;
1826 			case IEEE80211_ELEMID_RATES:
1827 				rates = frm;
1828 				break;
1829 			case IEEE80211_ELEMID_XRATES:
1830 				xrates = frm;
1831 				break;
1832 			}
1833 			frm += frm[1] + 2;
1834 		}
1835 		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1836 		if (xrates != NULL)
1837 			IEEE80211_VERIFY_ELEMENT(xrates,
1838 				IEEE80211_RATE_MAXSIZE - rates[1], return);
1839 		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1840 		IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1841 		if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1842 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1843 			    wh, NULL,
1844 			    "%s", "no ssid with ssid suppression enabled");
1845 			vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1846 			return;
1847 		}
1848 
1849 		/* XXX find a better class or define it's own */
1850 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1851 		    "%s", "recv probe req");
1852 		/*
1853 		 * Some legacy 11b clients cannot hack a complete
1854 		 * probe response frame.  When the request includes
1855 		 * only a bare-bones rate set, communicate this to
1856 		 * the transmit side.
1857 		 */
1858 		ieee80211_send_proberesp(vap, wh->i_addr2,
1859 		    is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1860 		break;
1861 
1862 	case IEEE80211_FC0_SUBTYPE_AUTH: {
1863 		uint16_t algo, seq, status;
1864 
1865 		if (vap->iv_state != IEEE80211_S_RUN) {
1866 			vap->iv_stats.is_rx_mgtdiscard++;
1867 			return;
1868 		}
1869 		if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1870 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1871 			    wh, NULL, "%s", "wrong bssid");
1872 			vap->iv_stats.is_rx_wrongbss++;	/*XXX unique stat?*/
1873 			return;
1874 		}
1875 		/*
1876 		 * auth frame format
1877 		 *	[2] algorithm
1878 		 *	[2] sequence
1879 		 *	[2] status
1880 		 *	[tlv*] challenge
1881 		 */
1882 		IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1883 		algo   = le16toh(*(uint16_t *)frm);
1884 		seq    = le16toh(*(uint16_t *)(frm + 2));
1885 		status = le16toh(*(uint16_t *)(frm + 4));
1886 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1887 		    "recv auth frame with algorithm %d seq %d", algo, seq);
1888 		/*
1889 		 * Consult the ACL policy module if setup.
1890 		 */
1891 		if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1892 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1893 			    wh, NULL, "%s", "disallowed by ACL");
1894 			vap->iv_stats.is_rx_acl++;
1895 			ieee80211_send_error(ni, wh->i_addr2,
1896 			    IEEE80211_FC0_SUBTYPE_AUTH,
1897 			    (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1898 			return;
1899 		}
1900 		if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1901 			IEEE80211_DISCARD(vap,
1902 			    IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1903 			    wh, NULL, "%s", "TKIP countermeasures enabled");
1904 			vap->iv_stats.is_rx_auth_countermeasures++;
1905 			ieee80211_send_error(ni, wh->i_addr2,
1906 				IEEE80211_FC0_SUBTYPE_AUTH,
1907 				IEEE80211_REASON_MIC_FAILURE);
1908 			return;
1909 		}
1910 		if (algo == IEEE80211_AUTH_ALG_SHARED)
1911 			hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1912 			    seq, status);
1913 		else if (algo == IEEE80211_AUTH_ALG_OPEN)
1914 			hostap_auth_open(ni, wh, rssi, nf, seq, status);
1915 		else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1916 			authalgreject(ni, wh, algo,
1917 			    seq+1, IEEE80211_STATUS_ALG);
1918 			return;
1919 		} else {
1920 			/*
1921 			 * We assume that an unknown algorithm is the result
1922 			 * of a decryption failure on a shared key auth frame;
1923 			 * return a status code appropriate for that instead
1924 			 * of IEEE80211_STATUS_ALG.
1925 			 *
1926 			 * NB: a seq# of 4 is intentional; the decrypted
1927 			 *     frame likely has a bogus seq value.
1928 			 */
1929 			authalgreject(ni, wh, algo,
1930 			    4, IEEE80211_STATUS_CHALLENGE);
1931 			return;
1932 		}
1933 		break;
1934 	}
1935 
1936 	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1937 	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1938 		uint16_t capinfo, lintval;
1939 		struct ieee80211_rsnparms rsnparms;
1940 
1941 		if (vap->iv_state != IEEE80211_S_RUN) {
1942 			vap->iv_stats.is_rx_mgtdiscard++;
1943 			return;
1944 		}
1945 		if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1946 			IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1947 			    wh, NULL, "%s", "wrong bssid");
1948 			vap->iv_stats.is_rx_assoc_bss++;
1949 			return;
1950 		}
1951 		if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1952 			reassoc = 1;
1953 			resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1954 		} else {
1955 			reassoc = 0;
1956 			resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1957 		}
1958 		if (ni == vap->iv_bss) {
1959 			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1960 			    "deny %s request, sta not authenticated",
1961 			    reassoc ? "reassoc" : "assoc");
1962 			ieee80211_send_error(ni, wh->i_addr2,
1963 			    IEEE80211_FC0_SUBTYPE_DEAUTH,
1964 			    IEEE80211_REASON_ASSOC_NOT_AUTHED);
1965 			vap->iv_stats.is_rx_assoc_notauth++;
1966 			return;
1967 		}
1968 
1969 		/*
1970 		 * asreq frame format
1971 		 *	[2] capability information
1972 		 *	[2] listen interval
1973 		 *	[6*] current AP address (reassoc only)
1974 		 *	[tlv] ssid
1975 		 *	[tlv] supported rates
1976 		 *	[tlv] extended supported rates
1977 		 *	[tlv] WPA or RSN
1978 		 *	[tlv] HT capabilities
1979 		 *	[tlv] Atheros capabilities
1980 		 */
1981 		IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1982 		capinfo = le16toh(*(uint16_t *)frm);	frm += 2;
1983 		lintval = le16toh(*(uint16_t *)frm);	frm += 2;
1984 		if (reassoc)
1985 			frm += 6;	/* ignore current AP info */
1986 		ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1987 		sfrm = frm;
1988 		while (efrm - frm > 1) {
1989 			IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1990 			switch (*frm) {
1991 			case IEEE80211_ELEMID_SSID:
1992 				ssid = frm;
1993 				break;
1994 			case IEEE80211_ELEMID_RATES:
1995 				rates = frm;
1996 				break;
1997 			case IEEE80211_ELEMID_XRATES:
1998 				xrates = frm;
1999 				break;
2000 			case IEEE80211_ELEMID_RSN:
2001 				rsn = frm;
2002 				break;
2003 			case IEEE80211_ELEMID_HTCAP:
2004 				htcap = frm;
2005 				break;
2006 			case IEEE80211_ELEMID_VENDOR:
2007 				if (iswpaoui(frm))
2008 					wpa = frm;
2009 				else if (iswmeinfo(frm))
2010 					wme = frm;
2011 #ifdef IEEE80211_SUPPORT_SUPERG
2012 				else if (isatherosoui(frm))
2013 					ath = frm;
2014 #endif
2015 				else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2016 					if (ishtcapoui(frm) && htcap == NULL)
2017 						htcap = frm;
2018 				}
2019 				break;
2020 			}
2021 			frm += frm[1] + 2;
2022 		}
2023 		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2024 		if (xrates != NULL)
2025 			IEEE80211_VERIFY_ELEMENT(xrates,
2026 				IEEE80211_RATE_MAXSIZE - rates[1], return);
2027 		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2028 		IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2029 		if (htcap != NULL) {
2030 			IEEE80211_VERIFY_LENGTH(htcap[1],
2031 			     htcap[0] == IEEE80211_ELEMID_VENDOR ?
2032 			         4 + sizeof(struct ieee80211_ie_htcap)-2 :
2033 			         sizeof(struct ieee80211_ie_htcap)-2,
2034 			     return);		/* XXX just NULL out? */
2035 		}
2036 
2037 		if ((vap->iv_flags & IEEE80211_F_WPA) &&
2038 		    !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2039 			return;
2040 		/* discard challenge after association */
2041 		if (ni->ni_challenge != NULL) {
2042 			free(ni->ni_challenge, M_80211_NODE);
2043 			ni->ni_challenge = NULL;
2044 		}
2045 		/* NB: 802.11 spec says to ignore station's privacy bit */
2046 		if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2047 			capinfomismatch(ni, wh, reassoc, resp,
2048 			    "capability", capinfo);
2049 			return;
2050 		}
2051 		/*
2052 		 * Disallow re-associate w/ invalid slot time setting.
2053 		 */
2054 		if (ni->ni_associd != 0 &&
2055 		    IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2056 		    ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2057 			capinfomismatch(ni, wh, reassoc, resp,
2058 			    "slot time", capinfo);
2059 			return;
2060 		}
2061 		rate = ieee80211_setup_rates(ni, rates, xrates,
2062 				IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2063 				IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2064 		if (rate & IEEE80211_RATE_BASIC) {
2065 			ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2066 			vap->iv_stats.is_rx_assoc_norate++;
2067 			return;
2068 		}
2069 		/*
2070 		 * If constrained to 11g-only stations reject an
2071 		 * 11b-only station.  We cheat a bit here by looking
2072 		 * at the max negotiated xmit rate and assuming anyone
2073 		 * with a best rate <24Mb/s is an 11b station.
2074 		 */
2075 		if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2076 			ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2077 			vap->iv_stats.is_rx_assoc_norate++;
2078 			return;
2079 		}
2080 		/*
2081 		 * Do HT rate set handling and setup HT node state.
2082 		 */
2083 		ni->ni_chan = vap->iv_bss->ni_chan;
2084 		if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2085 			rate = ieee80211_setup_htrates(ni, htcap,
2086 				IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2087 				IEEE80211_F_DOBRS);
2088 			if (rate & IEEE80211_RATE_BASIC) {
2089 				ratesetmismatch(ni, wh, reassoc, resp,
2090 				    "HT", rate);
2091 				vap->iv_stats.is_ht_assoc_norate++;
2092 				return;
2093 			}
2094 			ieee80211_ht_node_init(ni);
2095 			ieee80211_ht_updatehtcap(ni, htcap);
2096 		} else if (ni->ni_flags & IEEE80211_NODE_HT)
2097 			ieee80211_ht_node_cleanup(ni);
2098 #ifdef IEEE80211_SUPPORT_SUPERG
2099 		else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2100 			ieee80211_ff_node_cleanup(ni);
2101 #endif
2102 		/*
2103 		 * Allow AMPDU operation only with unencrypted traffic
2104 		 * or AES-CCM; the 11n spec only specifies these ciphers
2105 		 * so permitting any others is undefined and can lead
2106 		 * to interoperability problems.
2107 		 */
2108 		if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2109 		    (((vap->iv_flags & IEEE80211_F_WPA) &&
2110 		      rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2111 		     (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2112 			IEEE80211_NOTE(vap,
2113 			    IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2114 			    "disallow HT use because WEP or TKIP requested, "
2115 			    "capinfo 0x%x ucastcipher %d", capinfo,
2116 			    rsnparms.rsn_ucastcipher);
2117 			ieee80211_ht_node_cleanup(ni);
2118 			vap->iv_stats.is_ht_assoc_downgrade++;
2119 		}
2120 		/*
2121 		 * If constrained to 11n-only stations reject legacy stations.
2122 		 */
2123 		if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2124 		    (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2125 			htcapmismatch(ni, wh, reassoc, resp);
2126 			vap->iv_stats.is_ht_assoc_nohtcap++;
2127 			return;
2128 		}
2129 		IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2130 		ni->ni_noise = nf;
2131 		ni->ni_intval = lintval;
2132 		ni->ni_capinfo = capinfo;
2133 		ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2134 		ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2135 		/*
2136 		 * Store the IEs.
2137 		 * XXX maybe better to just expand
2138 		 */
2139 		if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2140 #define	setie(_ie, _off)	ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2141 			if (wpa != NULL)
2142 				setie(wpa_ie, wpa - sfrm);
2143 			if (rsn != NULL)
2144 				setie(rsn_ie, rsn - sfrm);
2145 			if (htcap != NULL)
2146 				setie(htcap_ie, htcap - sfrm);
2147 			if (wme != NULL) {
2148 				setie(wme_ie, wme - sfrm);
2149 				/*
2150 				 * Mark node as capable of QoS.
2151 				 */
2152 				ni->ni_flags |= IEEE80211_NODE_QOS;
2153 			} else
2154 				ni->ni_flags &= ~IEEE80211_NODE_QOS;
2155 #ifdef IEEE80211_SUPPORT_SUPERG
2156 			if (ath != NULL) {
2157 				setie(ath_ie, ath - sfrm);
2158 				/*
2159 				 * Parse ATH station parameters.
2160 				 */
2161 				ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2162 			} else
2163 #endif
2164 				ni->ni_ath_flags = 0;
2165 #undef setie
2166 		} else {
2167 			ni->ni_flags &= ~IEEE80211_NODE_QOS;
2168 			ni->ni_ath_flags = 0;
2169 		}
2170 		ieee80211_node_join(ni, resp);
2171 		ieee80211_deliver_l2uf(ni);
2172 		break;
2173 	}
2174 
2175 	case IEEE80211_FC0_SUBTYPE_DEAUTH:
2176 	case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2177 		uint16_t reason;
2178 
2179 		if (vap->iv_state != IEEE80211_S_RUN ||
2180 		    /* NB: can happen when in promiscuous mode */
2181 		    !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2182 			vap->iv_stats.is_rx_mgtdiscard++;
2183 			break;
2184 		}
2185 		/*
2186 		 * deauth/disassoc frame format
2187 		 *	[2] reason
2188 		 */
2189 		IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2190 		reason = le16toh(*(uint16_t *)frm);
2191 		if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2192 			vap->iv_stats.is_rx_deauth++;
2193 			IEEE80211_NODE_STAT(ni, rx_deauth);
2194 		} else {
2195 			vap->iv_stats.is_rx_disassoc++;
2196 			IEEE80211_NODE_STAT(ni, rx_disassoc);
2197 		}
2198 		IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2199 		    "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2200 			IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2201 		if (ni != vap->iv_bss)
2202 			ieee80211_node_leave(ni);
2203 		break;
2204 	}
2205 
2206 	case IEEE80211_FC0_SUBTYPE_ACTION:
2207 	case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2208 		if (ni == vap->iv_bss) {
2209 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2210 			    wh, NULL, "%s", "unknown node");
2211 			vap->iv_stats.is_rx_mgtdiscard++;
2212 		} else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2213 		    !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2214 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2215 			    wh, NULL, "%s", "not for us");
2216 			vap->iv_stats.is_rx_mgtdiscard++;
2217 		} else if (vap->iv_state != IEEE80211_S_RUN) {
2218 			IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2219 			    wh, NULL, "wrong state %s",
2220 			    ieee80211_state_name[vap->iv_state]);
2221 			vap->iv_stats.is_rx_mgtdiscard++;
2222 		} else {
2223 			if (ieee80211_parse_action(ni, m0) == 0)
2224 				(void)ic->ic_recv_action(ni, wh, frm, efrm);
2225 		}
2226 		break;
2227 
2228 	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2229 	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2230 	case IEEE80211_FC0_SUBTYPE_ATIM:
2231 		IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2232 		    wh, NULL, "%s", "not handled");
2233 		vap->iv_stats.is_rx_mgtdiscard++;
2234 		break;
2235 
2236 	default:
2237 		IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2238 		    wh, "mgt", "subtype 0x%x not handled", subtype);
2239 		vap->iv_stats.is_rx_badsubtype++;
2240 		break;
2241 	}
2242 }
2243 
2244 static void
2245 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2246 {
2247 	switch (subtype) {
2248 	case IEEE80211_FC0_SUBTYPE_PS_POLL:
2249 		ni->ni_vap->iv_recv_pspoll(ni, m);
2250 		break;
2251 	case IEEE80211_FC0_SUBTYPE_BAR:
2252 		ieee80211_recv_bar(ni, m);
2253 		break;
2254 	}
2255 }
2256 
2257 /*
2258  * Process a received ps-poll frame.
2259  */
2260 void
2261 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2262 {
2263 	struct ieee80211vap *vap = ni->ni_vap;
2264 	struct ieee80211com *ic = vap->iv_ic;
2265 	struct ieee80211_frame_min *wh;
2266 	struct mbuf *m;
2267 	uint16_t aid;
2268 	int qlen;
2269 
2270 	wh = mtod(m0, struct ieee80211_frame_min *);
2271 	if (ni->ni_associd == 0) {
2272 		IEEE80211_DISCARD(vap,
2273 		    IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2274 		    (struct ieee80211_frame *) wh, NULL,
2275 		    "%s", "unassociated station");
2276 		vap->iv_stats.is_ps_unassoc++;
2277 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2278 			IEEE80211_REASON_NOT_ASSOCED);
2279 		return;
2280 	}
2281 
2282 	aid = le16toh(*(uint16_t *)wh->i_dur);
2283 	if (aid != ni->ni_associd) {
2284 		IEEE80211_DISCARD(vap,
2285 		    IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2286 		    (struct ieee80211_frame *) wh, NULL,
2287 		    "aid mismatch: sta aid 0x%x poll aid 0x%x",
2288 		    ni->ni_associd, aid);
2289 		vap->iv_stats.is_ps_badaid++;
2290 		/*
2291 		 * NB: We used to deauth the station but it turns out
2292 		 * the Blackberry Curve 8230 (and perhaps other devices)
2293 		 * sometimes send the wrong AID when WME is negotiated.
2294 		 * Being more lenient here seems ok as we already check
2295 		 * the station is associated and we only return frames
2296 		 * queued for the station (i.e. we don't use the AID).
2297 		 */
2298 		return;
2299 	}
2300 
2301 	/* Okay, take the first queued packet and put it out... */
2302 	m = ieee80211_node_psq_dequeue(ni, &qlen);
2303 	if (m == NULL) {
2304 		IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2305 		    "%s", "recv ps-poll, but queue empty");
2306 		ieee80211_send_nulldata(ieee80211_ref_node(ni));
2307 		vap->iv_stats.is_ps_qempty++;	/* XXX node stat */
2308 		if (vap->iv_set_tim != NULL)
2309 			vap->iv_set_tim(ni, 0);	/* just in case */
2310 		return;
2311 	}
2312 	/*
2313 	 * If there are more packets, set the more packets bit
2314 	 * in the packet dispatched to the station; otherwise
2315 	 * turn off the TIM bit.
2316 	 */
2317 	if (qlen != 0) {
2318 		IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2319 		    "recv ps-poll, send packet, %u still queued", qlen);
2320 		m->m_flags |= M_MORE_DATA;
2321 	} else {
2322 		IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2323 		    "%s", "recv ps-poll, send packet, queue empty");
2324 		if (vap->iv_set_tim != NULL)
2325 			vap->iv_set_tim(ni, 0);
2326 	}
2327 	m->m_flags |= M_PWR_SAV;		/* bypass PS handling */
2328 
2329 	/*
2330 	 * Do the right thing; if it's an encap'ed frame then
2331 	 * call ieee80211_parent_xmitpkt() (and free the ref) else
2332 	 * call ieee80211_vap_xmitpkt().
2333 	 */
2334 	if (m->m_flags & M_ENCAP) {
2335 		if (ieee80211_parent_xmitpkt(ic, m) != 0)
2336 			ieee80211_free_node(ni);
2337 	} else {
2338 		(void) ieee80211_vap_xmitpkt(vap, m);
2339 	}
2340 }
2341