xref: /freebsd/sys/net80211/ieee80211_node.c (revision 3332f1b444d4a73238e9f59cca27bfc95fe936bd)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2001 Atsushi Onoe
5  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include "opt_wlan.h"
33 
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39 
40 #include <sys/socket.h>
41 
42 #include <net/if.h>
43 #include <net/if_var.h>
44 #include <net/if_media.h>
45 #include <net/ethernet.h>
46 
47 #include <net80211/ieee80211_var.h>
48 #include <net80211/ieee80211_input.h>
49 #ifdef IEEE80211_SUPPORT_SUPERG
50 #include <net80211/ieee80211_superg.h>
51 #endif
52 #ifdef IEEE80211_SUPPORT_TDMA
53 #include <net80211/ieee80211_tdma.h>
54 #endif
55 #include <net80211/ieee80211_wds.h>
56 #include <net80211/ieee80211_mesh.h>
57 #include <net80211/ieee80211_ratectl.h>
58 #include <net80211/ieee80211_vht.h>
59 
60 #include <net/bpf.h>
61 
62 /*
63  * IEEE80211_NODE_HASHSIZE must be a power of 2.
64  */
65 CTASSERT((IEEE80211_NODE_HASHSIZE & (IEEE80211_NODE_HASHSIZE-1)) == 0);
66 
67 /*
68  * Association id's are managed with a bit vector.
69  */
70 #define	IEEE80211_AID_SET(_vap, b) \
71 	((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] |= \
72 		(1 << (IEEE80211_AID(b) % 32)))
73 #define	IEEE80211_AID_CLR(_vap, b) \
74 	((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] &= \
75 		~(1 << (IEEE80211_AID(b) % 32)))
76 #define	IEEE80211_AID_ISSET(_vap, b) \
77 	((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))
78 
79 static int ieee80211_sta_join1(struct ieee80211_node *);
80 
81 static struct ieee80211_node *node_alloc(struct ieee80211vap *,
82 	const uint8_t [IEEE80211_ADDR_LEN]);
83 static int node_init(struct ieee80211_node *);
84 static void node_cleanup(struct ieee80211_node *);
85 static void node_free(struct ieee80211_node *);
86 static void node_age(struct ieee80211_node *);
87 static int8_t node_getrssi(const struct ieee80211_node *);
88 static void node_getsignal(const struct ieee80211_node *, int8_t *, int8_t *);
89 static void node_getmimoinfo(const struct ieee80211_node *,
90 	struct ieee80211_mimo_info *);
91 
92 static void _ieee80211_free_node(struct ieee80211_node *);
93 
94 static void node_reclaim(struct ieee80211_node_table *nt,
95 	struct ieee80211_node *ni);
96 static void ieee80211_node_table_init(struct ieee80211com *ic,
97 	struct ieee80211_node_table *nt, const char *name,
98 	int inact, int keymaxix);
99 static void ieee80211_node_table_reset(struct ieee80211_node_table *,
100 	struct ieee80211vap *);
101 static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
102 static void ieee80211_vap_erp_timeout(struct ieee80211vap *);
103 
104 MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
105 MALLOC_DEFINE(M_80211_NODE_IE, "80211nodeie", "802.11 node ie");
106 
107 void
108 ieee80211_node_attach(struct ieee80211com *ic)
109 {
110 	/* XXX really want maxlen enforced per-sta */
111 	ieee80211_ageq_init(&ic->ic_stageq, ic->ic_max_keyix * 8,
112 	    "802.11 staging q");
113 	ieee80211_node_table_init(ic, &ic->ic_sta, "station",
114 		IEEE80211_INACT_INIT, ic->ic_max_keyix);
115 	callout_init(&ic->ic_inact, 1);
116 	callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
117 		ieee80211_node_timeout, ic);
118 
119 	ic->ic_node_alloc = node_alloc;
120 	ic->ic_node_init = node_init;
121 	ic->ic_node_free = node_free;
122 	ic->ic_node_cleanup = node_cleanup;
123 	ic->ic_node_age = node_age;
124 	ic->ic_node_drain = node_age;		/* NB: same as age */
125 	ic->ic_node_getrssi = node_getrssi;
126 	ic->ic_node_getsignal = node_getsignal;
127 	ic->ic_node_getmimoinfo = node_getmimoinfo;
128 
129 	/*
130 	 * Set flags to be propagated to all vap's;
131 	 * these define default behaviour/configuration.
132 	 */
133 	ic->ic_flags_ext |= IEEE80211_FEXT_INACT; /* inactivity processing */
134 }
135 
136 void
137 ieee80211_node_detach(struct ieee80211com *ic)
138 {
139 
140 	callout_drain(&ic->ic_inact);
141 	ieee80211_node_table_cleanup(&ic->ic_sta);
142 	ieee80211_ageq_drain(&ic->ic_stageq);
143 	ieee80211_ageq_cleanup(&ic->ic_stageq);
144 }
145 
146 void
147 ieee80211_node_vattach(struct ieee80211vap *vap)
148 {
149 	/* NB: driver can override */
150 	vap->iv_max_aid = IEEE80211_AID_DEF;
151 
152 	/* default station inactivity timer settings */
153 	vap->iv_inact_init = IEEE80211_INACT_INIT;
154 	vap->iv_inact_auth = IEEE80211_INACT_AUTH;
155 	vap->iv_inact_run = IEEE80211_INACT_RUN;
156 	vap->iv_inact_probe = IEEE80211_INACT_PROBE;
157 
158 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_INACT,
159 	    "%s: init %u auth %u run %u probe %u\n", __func__,
160 	    vap->iv_inact_init, vap->iv_inact_auth,
161 	    vap->iv_inact_run, vap->iv_inact_probe);
162 }
163 
164 void
165 ieee80211_node_latevattach(struct ieee80211vap *vap)
166 {
167 	if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
168 		/* XXX should we allow max aid to be zero? */
169 		if (vap->iv_max_aid < IEEE80211_AID_MIN) {
170 			vap->iv_max_aid = IEEE80211_AID_MIN;
171 			if_printf(vap->iv_ifp,
172 			    "WARNING: max aid too small, changed to %d\n",
173 			    vap->iv_max_aid);
174 		}
175 		vap->iv_aid_bitmap = (uint32_t *) IEEE80211_MALLOC(
176 			howmany(vap->iv_max_aid, 32) * sizeof(uint32_t),
177 			M_80211_NODE,
178 			IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
179 		if (vap->iv_aid_bitmap == NULL) {
180 			/* XXX no way to recover */
181 			printf("%s: no memory for AID bitmap, max aid %d!\n",
182 			    __func__, vap->iv_max_aid);
183 			vap->iv_max_aid = 0;
184 		}
185 	}
186 
187 	ieee80211_reset_bss(vap);
188 
189 	vap->iv_auth = ieee80211_authenticator_get(vap->iv_bss->ni_authmode);
190 }
191 
192 void
193 ieee80211_node_vdetach(struct ieee80211vap *vap)
194 {
195 	struct ieee80211com *ic = vap->iv_ic;
196 
197 	ieee80211_node_table_reset(&ic->ic_sta, vap);
198 	if (vap->iv_bss != NULL) {
199 		ieee80211_free_node(vap->iv_bss);
200 		vap->iv_bss = NULL;
201 	}
202 	if (vap->iv_aid_bitmap != NULL) {
203 		IEEE80211_FREE(vap->iv_aid_bitmap, M_80211_NODE);
204 		vap->iv_aid_bitmap = NULL;
205 	}
206 }
207 
208 /*
209  * Port authorize/unauthorize interfaces for use by an authenticator.
210  */
211 
212 void
213 ieee80211_node_authorize(struct ieee80211_node *ni)
214 {
215 	struct ieee80211vap *vap = ni->ni_vap;
216 
217 	ni->ni_flags |= IEEE80211_NODE_AUTH;
218 	ni->ni_inact_reload = vap->iv_inact_run;
219 	ni->ni_inact = ni->ni_inact_reload;
220 
221 	IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
222 	    "%s: inact_reload %u", __func__, ni->ni_inact_reload);
223 }
224 
225 void
226 ieee80211_node_unauthorize(struct ieee80211_node *ni)
227 {
228 	struct ieee80211vap *vap = ni->ni_vap;
229 
230 	ni->ni_flags &= ~IEEE80211_NODE_AUTH;
231 	ni->ni_inact_reload = vap->iv_inact_auth;
232 	if (ni->ni_inact > ni->ni_inact_reload)
233 		ni->ni_inact = ni->ni_inact_reload;
234 
235 	IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
236 	    "%s: inact_reload %u inact %u", __func__,
237 	    ni->ni_inact_reload, ni->ni_inact);
238 }
239 
240 /*
241  * Fix tx parameters for a node according to ``association state''.
242  */
243 void
244 ieee80211_node_setuptxparms(struct ieee80211_node *ni)
245 {
246 	struct ieee80211vap *vap = ni->ni_vap;
247 	enum ieee80211_phymode mode;
248 
249 	if (ni->ni_flags & IEEE80211_NODE_VHT) {
250 		if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
251 			mode = IEEE80211_MODE_VHT_5GHZ;
252 		else
253 			mode = IEEE80211_MODE_VHT_2GHZ;
254 	} else if (ni->ni_flags & IEEE80211_NODE_HT) {
255 		if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
256 			mode = IEEE80211_MODE_11NA;
257 		else
258 			mode = IEEE80211_MODE_11NG;
259 	} else {				/* legacy rate handling */
260 		if (IEEE80211_IS_CHAN_ST(ni->ni_chan))
261 			mode = IEEE80211_MODE_STURBO_A;
262 		else if (IEEE80211_IS_CHAN_HALF(ni->ni_chan))
263 			mode = IEEE80211_MODE_HALF;
264 		else if (IEEE80211_IS_CHAN_QUARTER(ni->ni_chan))
265 			mode = IEEE80211_MODE_QUARTER;
266 		/* NB: 108A should be handled as 11a */
267 		else if (IEEE80211_IS_CHAN_A(ni->ni_chan))
268 			mode = IEEE80211_MODE_11A;
269 		else if (IEEE80211_IS_CHAN_108G(ni->ni_chan) ||
270 		    (ni->ni_flags & IEEE80211_NODE_ERP))
271 			mode = IEEE80211_MODE_11G;
272 		else
273 			mode = IEEE80211_MODE_11B;
274 	}
275 	ni->ni_txparms = &vap->iv_txparms[mode];
276 }
277 
278 /*
279  * Set/change the channel.  The rate set is also updated as
280  * to insure a consistent view by drivers.
281  * XXX should be private but hostap needs it to deal with CSA
282  */
283 void
284 ieee80211_node_set_chan(struct ieee80211_node *ni,
285 	struct ieee80211_channel *chan)
286 {
287 	struct ieee80211com *ic = ni->ni_ic;
288 	struct ieee80211vap *vap = ni->ni_vap;
289 	enum ieee80211_phymode mode;
290 
291 	KASSERT(chan != IEEE80211_CHAN_ANYC, ("no channel"));
292 
293 	ni->ni_chan = chan;
294 	mode = ieee80211_chan2mode(chan);
295 	if (IEEE80211_IS_CHAN_HT(chan)) {
296 		/*
297 		 * We must install the legacy rate est in ni_rates and the
298 		 * HT rate set in ni_htrates.
299 		 */
300 		ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan);
301 		/*
302 		 * Setup bss tx parameters based on operating mode.  We
303 		 * use legacy rates when operating in a mixed HT+non-HT bss
304 		 * and non-ERP rates in 11g for mixed ERP+non-ERP bss.
305 		 */
306 		if (mode == IEEE80211_MODE_11NA &&
307 		    (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
308 			mode = IEEE80211_MODE_11A;
309 		else if (mode == IEEE80211_MODE_11NG &&
310 		    (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
311 			mode = IEEE80211_MODE_11G;
312 		if (mode == IEEE80211_MODE_11G &&
313 		    (vap->iv_flags & IEEE80211_F_PUREG) == 0)
314 			mode = IEEE80211_MODE_11B;
315 	}
316 	ni->ni_txparms = &vap->iv_txparms[mode];
317 	ni->ni_rates = *ieee80211_get_suprates(ic, chan);
318 }
319 
320 static __inline void
321 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
322 {
323 	/* propagate useful state */
324 	nbss->ni_authmode = obss->ni_authmode;
325 	nbss->ni_txpower = obss->ni_txpower;
326 	nbss->ni_vlan = obss->ni_vlan;
327 	/* XXX statistics? */
328 	/* XXX legacy WDS bssid? */
329 }
330 
331 void
332 ieee80211_create_ibss(struct ieee80211vap* vap, struct ieee80211_channel *chan)
333 {
334 	struct ieee80211com *ic = vap->iv_ic;
335 	struct ieee80211_node *ni;
336 
337 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
338 		"%s: creating %s on channel %u%c flags 0x%08x\n", __func__,
339 		ieee80211_opmode_name[vap->iv_opmode],
340 		ieee80211_chan2ieee(ic, chan),
341 		ieee80211_channel_type_char(chan),
342 		chan->ic_flags);
343 
344 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
345 	if (ni == NULL) {
346 		/* XXX recovery? */
347 		return;
348 	}
349 	IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
350 	ni->ni_esslen = vap->iv_des_ssid[0].len;
351 	memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
352 	if (vap->iv_bss != NULL)
353 		copy_bss(ni, vap->iv_bss);
354 	ni->ni_intval = ic->ic_bintval;
355 	if (vap->iv_flags & IEEE80211_F_PRIVACY)
356 		ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
357 	if (ic->ic_phytype == IEEE80211_T_FH) {
358 		ni->ni_fhdwell = 200;	/* XXX */
359 		ni->ni_fhindex = 1;
360 	}
361 	if (vap->iv_opmode == IEEE80211_M_IBSS) {
362 		ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS;	/* XXX */
363 		if (vap->iv_flags & IEEE80211_F_DESBSSID)
364 			IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
365 		else {
366 			net80211_get_random_bytes(ni->ni_bssid,
367 			    IEEE80211_ADDR_LEN);
368 			/* clear group bit, add local bit */
369 			ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02;
370 		}
371 	} else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
372 		if (vap->iv_flags & IEEE80211_F_DESBSSID)
373 			IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
374 		else
375 #ifdef IEEE80211_SUPPORT_TDMA
376 		if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
377 #endif
378 			memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
379 #ifdef IEEE80211_SUPPORT_MESH
380 	} else if (vap->iv_opmode == IEEE80211_M_MBSS) {
381 		ni->ni_meshidlen = vap->iv_mesh->ms_idlen;
382 		memcpy(ni->ni_meshid, vap->iv_mesh->ms_id, ni->ni_meshidlen);
383 #endif
384 	}
385 	/*
386 	 * Fix the channel and related attributes.
387 	 */
388 	/* clear DFS CAC state on previous channel */
389 	if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
390 	    ic->ic_bsschan->ic_freq != chan->ic_freq &&
391 	    IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan))
392 		ieee80211_dfs_cac_clear(ic, ic->ic_bsschan);
393 	ic->ic_bsschan = chan;
394 	ieee80211_node_set_chan(ni, chan);
395 	ic->ic_curmode = ieee80211_chan2mode(chan);
396 	/*
397 	 * Do mode-specific setup.
398 	 */
399 	if (IEEE80211_IS_CHAN_FULL(chan)) {
400 		if (IEEE80211_IS_CHAN_ANYG(chan)) {
401 			/*
402 			 * Use a mixed 11b/11g basic rate set.
403 			 */
404 			ieee80211_setbasicrates(&ni->ni_rates,
405 			    IEEE80211_MODE_11G);
406 			if (vap->iv_flags & IEEE80211_F_PUREG) {
407 				/*
408 				 * Also mark OFDM rates basic so 11b
409 				 * stations do not join (WiFi compliance).
410 				 */
411 				ieee80211_addbasicrates(&ni->ni_rates,
412 				    IEEE80211_MODE_11A);
413 			}
414 		} else if (IEEE80211_IS_CHAN_B(chan)) {
415 			/*
416 			 * Force pure 11b rate set.
417 			 */
418 			ieee80211_setbasicrates(&ni->ni_rates,
419 				IEEE80211_MODE_11B);
420 		}
421 	}
422 
423 	/* XXX TODO: other bits and pieces - eg fast-frames? */
424 
425 	/* If we're an 11n channel then initialise the 11n bits */
426 	if (IEEE80211_IS_CHAN_VHT(ni->ni_chan)) {
427 		/* XXX what else? */
428 		ieee80211_ht_node_init(ni);
429 		ieee80211_vht_node_init(ni);
430 	} else if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
431 		/* XXX what else? */
432 		ieee80211_ht_node_init(ni);
433 	}
434 
435 	(void) ieee80211_sta_join1(ieee80211_ref_node(ni));
436 }
437 
438 /*
439  * Reset bss state on transition to the INIT state.
440  * Clear any stations from the table (they have been
441  * deauth'd) and reset the bss node (clears key, rate
442  * etc. state).
443  */
444 void
445 ieee80211_reset_bss(struct ieee80211vap *vap)
446 {
447 	struct ieee80211com *ic = vap->iv_ic;
448 	struct ieee80211_node *ni, *obss;
449 
450 	ieee80211_node_table_reset(&ic->ic_sta, vap);
451 	/* XXX multi-bss: wrong */
452 	ieee80211_vap_reset_erp(vap);
453 
454 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
455 	KASSERT(ni != NULL, ("unable to setup initial BSS node"));
456 	obss = vap->iv_bss;
457 	vap->iv_bss = ieee80211_ref_node(ni);
458 	if (obss != NULL) {
459 		copy_bss(ni, obss);
460 		ni->ni_intval = ic->ic_bintval;
461 		ieee80211_free_node(obss);
462 	} else
463 		IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
464 }
465 
466 static int
467 match_ssid(const struct ieee80211_node *ni,
468 	int nssid, const struct ieee80211_scan_ssid ssids[])
469 {
470 	int i;
471 
472 	for (i = 0; i < nssid; i++) {
473 		if (ni->ni_esslen == ssids[i].len &&
474 		     memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
475 			return 1;
476 	}
477 	return 0;
478 }
479 
480 /*
481  * Test a node for suitability/compatibility.
482  */
483 static int
484 check_bss(struct ieee80211vap *vap, struct ieee80211_node *ni)
485 {
486 	struct ieee80211com *ic = ni->ni_ic;
487         uint8_t rate;
488 
489 	if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
490 		return 0;
491 	if (vap->iv_opmode == IEEE80211_M_IBSS) {
492 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
493 			return 0;
494 	} else {
495 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
496 			return 0;
497 	}
498 	if (vap->iv_flags & IEEE80211_F_PRIVACY) {
499 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
500 			return 0;
501 	} else {
502 		/* XXX does this mean privacy is supported or required? */
503 		if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
504 			return 0;
505 	}
506 	rate = ieee80211_fix_rate(ni, &ni->ni_rates,
507 	    IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
508 	if (rate & IEEE80211_RATE_BASIC)
509 		return 0;
510 	if (vap->iv_des_nssid != 0 &&
511 	    !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
512 		return 0;
513 	if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
514 	    !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
515 		return 0;
516 	return 1;
517 }
518 
519 #ifdef IEEE80211_DEBUG
520 /*
521  * Display node suitability/compatibility.
522  */
523 static void
524 check_bss_debug(struct ieee80211vap *vap, struct ieee80211_node *ni)
525 {
526 	struct ieee80211com *ic = ni->ni_ic;
527         uint8_t rate;
528         int fail;
529 
530 	fail = 0;
531 	if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
532 		fail |= 0x01;
533 	if (vap->iv_opmode == IEEE80211_M_IBSS) {
534 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
535 			fail |= 0x02;
536 	} else {
537 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
538 			fail |= 0x02;
539 	}
540 	if (vap->iv_flags & IEEE80211_F_PRIVACY) {
541 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
542 			fail |= 0x04;
543 	} else {
544 		/* XXX does this mean privacy is supported or required? */
545 		if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
546 			fail |= 0x04;
547 	}
548 	rate = ieee80211_fix_rate(ni, &ni->ni_rates,
549 	     IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
550 	if (rate & IEEE80211_RATE_BASIC)
551 		fail |= 0x08;
552 	if (vap->iv_des_nssid != 0 &&
553 	    !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
554 		fail |= 0x10;
555 	if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
556 	    !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
557 		fail |= 0x20;
558 
559 	printf(" %c %s", fail ? '-' : '+', ether_sprintf(ni->ni_macaddr));
560 	printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
561 	printf(" %3d%c",
562 	    ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
563 	printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
564 	    fail & 0x08 ? '!' : ' ');
565 	printf(" %4s%c",
566 	    (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
567 	    (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
568 	    "????",
569 	    fail & 0x02 ? '!' : ' ');
570 	printf(" %3s%c ",
571 	    (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?  "wep" : "no",
572 	    fail & 0x04 ? '!' : ' ');
573 	ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
574 	printf("%s\n", fail & 0x10 ? "!" : "");
575 }
576 #endif /* IEEE80211_DEBUG */
577 
578 int
579 ieee80211_ibss_merge_check(struct ieee80211_node *ni)
580 {
581 	struct ieee80211vap *vap = ni->ni_vap;
582 
583 	if (ni == vap->iv_bss ||
584 	    IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid)) {
585 		/* unchanged, nothing to do */
586 		return 0;
587 	}
588 
589 	if (!check_bss(vap, ni)) {
590 		/* capabilities mismatch */
591 		IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
592 		    "%s: merge failed, capabilities mismatch\n", __func__);
593 #ifdef IEEE80211_DEBUG
594 		if (ieee80211_msg_assoc(vap))
595 			check_bss_debug(vap, ni);
596 #endif
597 		vap->iv_stats.is_ibss_capmismatch++;
598 		return 0;
599 	}
600 
601 	return 1;
602 }
603 
604 /*
605  * Check if the given node should populate the node table.
606  *
607  * We need to be in "see all beacons for all ssids" mode in order
608  * to do IBSS merges, however this means we will populate nodes for
609  * /all/ IBSS SSIDs, versus just the one we care about.
610  *
611  * So this check ensures the node can actually belong to our IBSS
612  * configuration.  For now it simply checks the SSID.
613  */
614 int
615 ieee80211_ibss_node_check_new(struct ieee80211_node *ni,
616     const struct ieee80211_scanparams *scan)
617 {
618 	struct ieee80211vap *vap = ni->ni_vap;
619 	int i;
620 
621 	/*
622 	 * If we have no SSID and no scan SSID, return OK.
623 	 */
624 	if (vap->iv_des_nssid == 0 && scan->ssid == NULL)
625 		goto ok;
626 
627 	/*
628 	 * If we have one of (SSID, scan SSID) then return error.
629 	 */
630 	if (!! (vap->iv_des_nssid == 0) != !! (scan->ssid == NULL))
631 		goto mismatch;
632 
633 	/*
634 	 * Double-check - we need scan SSID.
635 	 */
636 	if (scan->ssid == NULL)
637 		goto mismatch;
638 
639 	/*
640 	 * Check if the scan SSID matches the SSID list for the VAP.
641 	 */
642 	for (i = 0; i < vap->iv_des_nssid; i++) {
643 		/* Sanity length check */
644 		if (vap->iv_des_ssid[i].len != scan->ssid[1])
645 			continue;
646 
647 		/* Note: SSID in the scan entry is the IE format */
648 		if (memcmp(vap->iv_des_ssid[i].ssid, scan->ssid + 2,
649 		    vap->iv_des_ssid[i].len) == 0)
650 			goto ok;
651 	}
652 
653 mismatch:
654 	return (0);
655 ok:
656 	return (1);
657 }
658 
659 /*
660  * Handle 802.11 ad hoc network merge.  The
661  * convention, set by the Wireless Ethernet Compatibility Alliance
662  * (WECA), is that an 802.11 station will change its BSSID to match
663  * the "oldest" 802.11 ad hoc network, on the same channel, that
664  * has the station's desired SSID.  The "oldest" 802.11 network
665  * sends beacons with the greatest TSF timestamp.
666  *
667  * The caller is assumed to validate TSF's before attempting a merge.
668  *
669  * Return !0 if the BSSID changed, 0 otherwise.
670  */
671 int
672 ieee80211_ibss_merge(struct ieee80211_node *ni)
673 {
674 #ifdef IEEE80211_DEBUG
675 	struct ieee80211vap *vap = ni->ni_vap;
676 #endif
677 
678 	if (! ieee80211_ibss_merge_check(ni))
679 		return 0;
680 
681 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
682 		"%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
683 		ether_sprintf(ni->ni_bssid),
684 		vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
685 		vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long",
686 		vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : ""
687 	);
688 	return ieee80211_sta_join1(ieee80211_ref_node(ni));
689 }
690 
691 /*
692  * Calculate HT channel promotion flags for all vaps.
693  * This assumes ni_chan have been setup for each vap.
694  */
695 static int
696 gethtadjustflags(struct ieee80211com *ic)
697 {
698 	struct ieee80211vap *vap;
699 	int flags;
700 
701 	flags = 0;
702 	/* XXX locking */
703 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
704 		if (vap->iv_state < IEEE80211_S_RUN)
705 			continue;
706 		switch (vap->iv_opmode) {
707 		case IEEE80211_M_WDS:
708 		case IEEE80211_M_STA:
709 		case IEEE80211_M_AHDEMO:
710 		case IEEE80211_M_HOSTAP:
711 		case IEEE80211_M_IBSS:
712 		case IEEE80211_M_MBSS:
713 			flags |= ieee80211_htchanflags(vap->iv_bss->ni_chan);
714 			break;
715 		default:
716 			break;
717 		}
718 	}
719 	return flags;
720 }
721 
722 /*
723  * Calculate VHT channel promotion flags for all vaps.
724  * This assumes ni_chan have been setup for each vap.
725  */
726 static int
727 getvhtadjustflags(struct ieee80211com *ic)
728 {
729 	struct ieee80211vap *vap;
730 	int flags;
731 
732 	flags = 0;
733 	/* XXX locking */
734 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
735 		if (vap->iv_state < IEEE80211_S_RUN)
736 			continue;
737 		switch (vap->iv_opmode) {
738 		case IEEE80211_M_WDS:
739 		case IEEE80211_M_STA:
740 		case IEEE80211_M_AHDEMO:
741 		case IEEE80211_M_HOSTAP:
742 		case IEEE80211_M_IBSS:
743 		case IEEE80211_M_MBSS:
744 			flags |= ieee80211_vhtchanflags(vap->iv_bss->ni_chan);
745 			break;
746 		default:
747 			break;
748 		}
749 	}
750 	return flags;
751 }
752 
753 /*
754  * Check if the current channel needs to change based on whether
755  * any vap's are using HT20/HT40.  This is used to sync the state
756  * of ic_curchan after a channel width change on a running vap.
757  *
758  * Same applies for VHT.
759  */
760 void
761 ieee80211_sync_curchan(struct ieee80211com *ic)
762 {
763 	struct ieee80211_channel *c;
764 
765 	c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan, gethtadjustflags(ic));
766 	c = ieee80211_vht_adjust_channel(ic, c, getvhtadjustflags(ic));
767 
768 	if (c != ic->ic_curchan) {
769 		ic->ic_curchan = c;
770 		ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
771 		ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
772 		IEEE80211_UNLOCK(ic);
773 		ic->ic_set_channel(ic);
774 		ieee80211_radiotap_chan_change(ic);
775 		IEEE80211_LOCK(ic);
776 	}
777 }
778 
779 /*
780  * Setup the current channel.  The request channel may be
781  * promoted if other vap's are operating with HT20/HT40.
782  */
783 void
784 ieee80211_setupcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
785 {
786 	if (ic->ic_htcaps & IEEE80211_HTC_HT) {
787 		int flags = gethtadjustflags(ic);
788 		/*
789 		 * Check for channel promotion required to support the
790 		 * set of running vap's.  This assumes we are called
791 		 * after ni_chan is setup for each vap.
792 		 */
793 		/* XXX VHT? */
794 		/* NB: this assumes IEEE80211_FHT_USEHT40 > IEEE80211_FHT_HT */
795 		if (flags > ieee80211_htchanflags(c))
796 			c = ieee80211_ht_adjust_channel(ic, c, flags);
797 	}
798 
799 	/*
800 	 * VHT promotion - this will at least promote to VHT20/40
801 	 * based on what HT has done; it may further promote the
802 	 * channel to VHT80 or above.
803 	 */
804 	if (ic->ic_vhtcaps != 0) {
805 		int flags = getvhtadjustflags(ic);
806 		if (flags > ieee80211_vhtchanflags(c))
807 			c = ieee80211_vht_adjust_channel(ic, c, flags);
808 	}
809 
810 	ic->ic_bsschan = ic->ic_curchan = c;
811 	ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
812 	ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
813 }
814 
815 /*
816  * Change the current channel.  The channel change is guaranteed to have
817  * happened before the next state change.
818  */
819 void
820 ieee80211_setcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
821 {
822 	ieee80211_setupcurchan(ic, c);
823 	ieee80211_runtask(ic, &ic->ic_chan_task);
824 }
825 
826 void
827 ieee80211_update_chw(struct ieee80211com *ic)
828 {
829 
830 	ieee80211_setupcurchan(ic, ic->ic_curchan);
831 	ieee80211_runtask(ic, &ic->ic_chw_task);
832 }
833 
834 /*
835  * Join the specified IBSS/BSS network.  The node is assumed to
836  * be passed in with a held reference.
837  */
838 static int
839 ieee80211_sta_join1(struct ieee80211_node *selbs)
840 {
841 	struct ieee80211vap *vap = selbs->ni_vap;
842 	struct ieee80211com *ic = selbs->ni_ic;
843 	struct ieee80211_node *obss;
844 	int canreassoc;
845 
846 	/*
847 	 * Committed to selbs, setup state.
848 	 */
849 	obss = vap->iv_bss;
850 	/*
851 	 * Check if old+new node have the same address in which
852 	 * case we can reassociate when operating in sta mode.
853 	 */
854 	canreassoc = (obss != NULL &&
855 		vap->iv_state == IEEE80211_S_RUN &&
856 		IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
857 	vap->iv_bss = selbs;		/* NB: caller assumed to bump refcnt */
858 	if (obss != NULL) {
859 		struct ieee80211_node_table *nt = obss->ni_table;
860 
861 		copy_bss(selbs, obss);
862 		ieee80211_node_decref(obss);	/* iv_bss reference */
863 
864 		IEEE80211_NODE_LOCK(nt);
865 		node_reclaim(nt, obss);		/* station table reference */
866 		IEEE80211_NODE_UNLOCK(nt);
867 
868 		obss = NULL;		/* NB: guard against later use */
869 	}
870 
871 	/*
872 	 * Delete unusable rates; we've already checked
873 	 * that the negotiated rate set is acceptable.
874 	 */
875 	ieee80211_fix_rate(vap->iv_bss, &vap->iv_bss->ni_rates,
876 		IEEE80211_F_DODEL | IEEE80211_F_JOIN);
877 
878 	ieee80211_setcurchan(ic, selbs->ni_chan);
879 	/*
880 	 * Set the erp state (mostly the slot time) to deal with
881 	 * the auto-select case; this should be redundant if the
882 	 * mode is locked.
883 	 */
884 	ieee80211_vap_reset_erp(vap);
885 	ieee80211_wme_initparams(vap);
886 
887 	if (vap->iv_opmode == IEEE80211_M_STA) {
888 		if (canreassoc) {
889 			/* Reassociate */
890 			ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
891 		} else {
892 			/*
893 			 * Act as if we received a DEAUTH frame in case we
894 			 * are invoked from the RUN state.  This will cause
895 			 * us to try to re-authenticate if we are operating
896 			 * as a station.
897 			 */
898 			ieee80211_new_state(vap, IEEE80211_S_AUTH,
899 				IEEE80211_FC0_SUBTYPE_DEAUTH);
900 		}
901 	} else
902 		ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
903 	return 1;
904 }
905 
906 int
907 ieee80211_sta_join(struct ieee80211vap *vap, struct ieee80211_channel *chan,
908 	const struct ieee80211_scan_entry *se)
909 {
910 	struct ieee80211com *ic = vap->iv_ic;
911 	struct ieee80211_node *ni;
912 	int do_ht = 0;
913 
914 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, se->se_macaddr);
915 	if (ni == NULL) {
916 		/* XXX msg */
917 		return 0;
918 	}
919 
920 	/*
921 	 * Expand scan state into node's format.
922 	 * XXX may not need all this stuff
923 	 */
924 	IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
925 	ni->ni_esslen = se->se_ssid[1];
926 	memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
927 	ni->ni_tstamp.tsf = se->se_tstamp.tsf;
928 	ni->ni_intval = se->se_intval;
929 	ni->ni_capinfo = se->se_capinfo;
930 	ni->ni_chan = chan;
931 	ni->ni_timoff = se->se_timoff;
932 	ni->ni_fhdwell = se->se_fhdwell;
933 	ni->ni_fhindex = se->se_fhindex;
934 	ni->ni_erp = se->se_erp;
935 	IEEE80211_RSSI_LPF(ni->ni_avgrssi, se->se_rssi);
936 	ni->ni_noise = se->se_noise;
937 	if (vap->iv_opmode == IEEE80211_M_STA) {
938 		/* NB: only infrastructure mode requires an associd */
939 		ni->ni_flags |= IEEE80211_NODE_ASSOCID;
940 	}
941 
942 	if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
943 		ieee80211_ies_expand(&ni->ni_ies);
944 #ifdef IEEE80211_SUPPORT_SUPERG
945 		if (ni->ni_ies.ath_ie != NULL)
946 			ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
947 #endif
948 		if (ni->ni_ies.htcap_ie != NULL)
949 			ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
950 		if (ni->ni_ies.htinfo_ie != NULL)
951 			ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
952 #ifdef IEEE80211_SUPPORT_MESH
953 		if (ni->ni_ies.meshid_ie != NULL)
954 			ieee80211_parse_meshid(ni, ni->ni_ies.meshid_ie);
955 #endif
956 #ifdef IEEE80211_SUPPORT_TDMA
957 		if (ni->ni_ies.tdma_ie != NULL)
958 			ieee80211_parse_tdma(ni, ni->ni_ies.tdma_ie);
959 #endif
960 		if (ni->ni_ies.vhtcap_ie != NULL)
961 			ieee80211_parse_vhtcap(ni, ni->ni_ies.vhtcap_ie);
962 		if (ni->ni_ies.vhtopmode_ie != NULL)
963 			ieee80211_parse_vhtopmode(ni, ni->ni_ies.vhtopmode_ie);
964 
965 		/* XXX parse BSSLOAD IE */
966 		/* XXX parse TXPWRENV IE */
967 		/* XXX parse APCHANREP IE */
968 	}
969 
970 	vap->iv_dtim_period = se->se_dtimperiod;
971 	vap->iv_dtim_count = 0;
972 
973 	/* NB: must be after ni_chan is setup */
974 	ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
975 		IEEE80211_F_DOSORT);
976 	if (ieee80211_iserp_rateset(&ni->ni_rates))
977 		ni->ni_flags |= IEEE80211_NODE_ERP;
978 
979 	/*
980 	 * Setup HT state for this node if it's available, otherwise
981 	 * non-STA modes won't pick this state up.
982 	 *
983 	 * For IBSS and related modes that don't go through an
984 	 * association request/response, the only appropriate place
985 	 * to setup the HT state is here.
986 	 */
987 	if (ni->ni_ies.htinfo_ie != NULL &&
988 	    ni->ni_ies.htcap_ie != NULL &&
989 	    vap->iv_flags_ht & IEEE80211_FHT_HT) {
990 		ieee80211_ht_node_init(ni);
991 		ieee80211_ht_updateparams(ni,
992 		    ni->ni_ies.htcap_ie,
993 		    ni->ni_ies.htinfo_ie);
994 		do_ht = 1;
995 	}
996 
997 	/*
998 	 * Setup VHT state for this node if it's available.
999 	 * Same as the above.
1000 	 *
1001 	 * For now, don't allow 2GHz VHT operation.
1002 	 */
1003 	if (ni->ni_ies.vhtopmode_ie != NULL &&
1004 	    ni->ni_ies.vhtcap_ie != NULL &&
1005 	    vap->iv_flags_vht & IEEE80211_FVHT_VHT) {
1006 		if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1007 			printf("%s: BSS %6D: 2GHz channel, VHT info; ignoring\n",
1008 			    __func__,
1009 			    ni->ni_macaddr,
1010 			    ":");
1011 		} else {
1012 			ieee80211_vht_node_init(ni);
1013 			ieee80211_vht_updateparams(ni,
1014 			    ni->ni_ies.vhtcap_ie,
1015 			    ni->ni_ies.vhtopmode_ie);
1016 			ieee80211_setup_vht_rates(ni, ni->ni_ies.vhtcap_ie,
1017 			    ni->ni_ies.vhtopmode_ie);
1018 			do_ht = 1;
1019 		}
1020 	}
1021 
1022 	/* Finally do the node channel change */
1023 	if (do_ht) {
1024 		ieee80211_ht_updateparams_final(ni, ni->ni_ies.htcap_ie,
1025 		    ni->ni_ies.htinfo_ie);
1026 		ieee80211_setup_htrates(ni, ni->ni_ies.htcap_ie,
1027 		    IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1028 		ieee80211_setup_basic_htrates(ni, ni->ni_ies.htinfo_ie);
1029 	}
1030 
1031 	/* XXX else check for ath FF? */
1032 	/* XXX QoS? Difficult given that WME config is specific to a master */
1033 
1034 	ieee80211_node_setuptxparms(ni);
1035 	ieee80211_ratectl_node_init(ni);
1036 
1037 	return ieee80211_sta_join1(ieee80211_ref_node(ni));
1038 }
1039 
1040 /*
1041  * Leave the specified IBSS/BSS network.  The node is assumed to
1042  * be passed in with a held reference.
1043  */
1044 void
1045 ieee80211_sta_leave(struct ieee80211_node *ni)
1046 {
1047 	struct ieee80211com *ic = ni->ni_ic;
1048 
1049 	ic->ic_node_cleanup(ni);
1050 	ieee80211_notify_node_leave(ni);
1051 }
1052 
1053 /*
1054  * Send a deauthenticate frame and drop the station.
1055  */
1056 void
1057 ieee80211_node_deauth(struct ieee80211_node *ni, int reason)
1058 {
1059 	/* NB: bump the refcnt to be sure temporary nodes are not reclaimed */
1060 	ieee80211_ref_node(ni);
1061 	if (ni->ni_associd != 0)
1062 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
1063 	ieee80211_node_leave(ni);
1064 	ieee80211_free_node(ni);
1065 }
1066 
1067 static struct ieee80211_node *
1068 node_alloc(struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
1069 {
1070 	struct ieee80211_node *ni;
1071 
1072 	ni = (struct ieee80211_node *) IEEE80211_MALLOC(sizeof(struct ieee80211_node),
1073 		M_80211_NODE, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
1074 	return ni;
1075 }
1076 
1077 static int
1078 node_init(struct ieee80211_node *ni)
1079 {
1080 	return 0;
1081 }
1082 
1083 /*
1084  * Initialize an ie blob with the specified data.  If previous
1085  * data exists re-use the data block.  As a side effect we clear
1086  * all references to specific ie's; the caller is required to
1087  * recalculate them.
1088  */
1089 int
1090 ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
1091 {
1092 	/* NB: assumes data+len are the last fields */
1093 	memset(ies, 0, offsetof(struct ieee80211_ies, data));
1094 	if (ies->data != NULL && ies->len != len) {
1095 		/* data size changed */
1096 		IEEE80211_FREE(ies->data, M_80211_NODE_IE);
1097 		ies->data = NULL;
1098 	}
1099 	if (ies->data == NULL) {
1100 		ies->data = (uint8_t *) IEEE80211_MALLOC(len, M_80211_NODE_IE,
1101 		    IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
1102 		if (ies->data == NULL) {
1103 			ies->len = 0;
1104 			/* NB: pointers have already been zero'd above */
1105 			return 0;
1106 		}
1107 	}
1108 	memcpy(ies->data, data, len);
1109 	ies->len = len;
1110 	return 1;
1111 }
1112 
1113 /*
1114  * Reclaim storage for an ie blob.
1115  */
1116 void
1117 ieee80211_ies_cleanup(struct ieee80211_ies *ies)
1118 {
1119 	if (ies->data != NULL)
1120 		IEEE80211_FREE(ies->data, M_80211_NODE_IE);
1121 }
1122 
1123 /*
1124  * Expand an ie blob data contents and to fillin individual
1125  * ie pointers.  The data blob is assumed to be well-formed;
1126  * we don't do any validity checking of ie lengths.
1127  */
1128 void
1129 ieee80211_ies_expand(struct ieee80211_ies *ies)
1130 {
1131 	uint8_t *ie;
1132 	int ielen;
1133 
1134 	ie = ies->data;
1135 	ielen = ies->len;
1136 	while (ielen > 1) {
1137 		switch (ie[0]) {
1138 		case IEEE80211_ELEMID_VENDOR:
1139 			if (iswpaoui(ie))
1140 				ies->wpa_ie = ie;
1141 			else if (iswmeoui(ie))
1142 				ies->wme_ie = ie;
1143 #ifdef IEEE80211_SUPPORT_SUPERG
1144 			else if (isatherosoui(ie))
1145 				ies->ath_ie = ie;
1146 #endif
1147 #ifdef IEEE80211_SUPPORT_TDMA
1148 			else if (istdmaoui(ie))
1149 				ies->tdma_ie = ie;
1150 #endif
1151 			break;
1152 		case IEEE80211_ELEMID_RSN:
1153 			ies->rsn_ie = ie;
1154 			break;
1155 		case IEEE80211_ELEMID_HTCAP:
1156 			ies->htcap_ie = ie;
1157 			break;
1158 		case IEEE80211_ELEMID_HTINFO:
1159 			ies->htinfo_ie = ie;
1160 			break;
1161 #ifdef IEEE80211_SUPPORT_MESH
1162 		case IEEE80211_ELEMID_MESHID:
1163 			ies->meshid_ie = ie;
1164 			break;
1165 #endif
1166 		case IEEE80211_ELEMID_VHT_CAP:
1167 			ies->vhtcap_ie = ie;
1168 			break;
1169 		case IEEE80211_ELEMID_VHT_OPMODE:
1170 			ies->vhtopmode_ie = ie;
1171 			break;
1172 		case IEEE80211_ELEMID_VHT_PWR_ENV:
1173 			ies->vhtpwrenv_ie = ie;
1174 			break;
1175 		case IEEE80211_ELEMID_BSSLOAD:
1176 			ies->bssload_ie = ie;
1177 			break;
1178 		case IEEE80211_ELEMID_APCHANREP:
1179 			ies->apchanrep_ie = ie;
1180 			break;
1181 		}
1182 		ielen -= 2 + ie[1];
1183 		ie += 2 + ie[1];
1184 	}
1185 }
1186 
1187 /*
1188  * Reclaim any resources in a node and reset any critical
1189  * state.  Typically nodes are free'd immediately after,
1190  * but in some cases the storage may be reused so we need
1191  * to insure consistent state (should probably fix that).
1192  */
1193 static void
1194 node_cleanup(struct ieee80211_node *ni)
1195 {
1196 	struct ieee80211vap *vap = ni->ni_vap;
1197 	struct ieee80211com *ic = ni->ni_ic;
1198 	int i;
1199 
1200 	/* NB: preserve ni_table */
1201 	if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
1202 		if (vap->iv_opmode != IEEE80211_M_STA)
1203 			vap->iv_ps_sta--;
1204 		ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
1205 		IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
1206 		    "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
1207 	}
1208 	/*
1209 	 * Cleanup any VHT and HT-related state.
1210 	 */
1211 	if (ni->ni_flags & IEEE80211_NODE_VHT)
1212 		ieee80211_vht_node_cleanup(ni);
1213 	if (ni->ni_flags & IEEE80211_NODE_HT)
1214 		ieee80211_ht_node_cleanup(ni);
1215 #ifdef IEEE80211_SUPPORT_SUPERG
1216 	/* Always do FF node cleanup; for A-MSDU */
1217 	ieee80211_ff_node_cleanup(ni);
1218 #endif
1219 #ifdef IEEE80211_SUPPORT_MESH
1220 	/*
1221 	 * Cleanup any mesh-related state.
1222 	 */
1223 	if (vap->iv_opmode == IEEE80211_M_MBSS)
1224 		ieee80211_mesh_node_cleanup(ni);
1225 #endif
1226 	/*
1227 	 * Clear any staging queue entries.
1228 	 */
1229 	ieee80211_ageq_drain_node(&ic->ic_stageq, ni);
1230 
1231 	/*
1232 	 * Clear AREF flag that marks the authorization refcnt bump
1233 	 * has happened.  This is probably not needed as the node
1234 	 * should always be removed from the table so not found but
1235 	 * do it just in case.
1236 	 * Likewise clear the ASSOCID flag as these flags are intended
1237 	 * to be managed in tandem.
1238 	 */
1239 	ni->ni_flags &= ~(IEEE80211_NODE_AREF | IEEE80211_NODE_ASSOCID);
1240 
1241 	/*
1242 	 * Drain power save queue and, if needed, clear TIM.
1243 	 */
1244 	if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
1245 		vap->iv_set_tim(ni, 0);
1246 
1247 	ni->ni_associd = 0;
1248 	if (ni->ni_challenge != NULL) {
1249 		IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1250 		ni->ni_challenge = NULL;
1251 	}
1252 	/*
1253 	 * Preserve SSID, WPA, and WME ie's so the bss node is
1254 	 * reusable during a re-auth/re-assoc state transition.
1255 	 * If we remove these data they will not be recreated
1256 	 * because they come from a probe-response or beacon frame
1257 	 * which cannot be expected prior to the association-response.
1258 	 * This should not be an issue when operating in other modes
1259 	 * as stations leaving always go through a full state transition
1260 	 * which will rebuild this state.
1261 	 *
1262 	 * XXX does this leave us open to inheriting old state?
1263 	 */
1264 	for (i = 0; i < nitems(ni->ni_rxfrag); i++)
1265 		if (ni->ni_rxfrag[i] != NULL) {
1266 			m_freem(ni->ni_rxfrag[i]);
1267 			ni->ni_rxfrag[i] = NULL;
1268 		}
1269 	/*
1270 	 * Must be careful here to remove any key map entry w/o a LOR.
1271 	 */
1272 	ieee80211_node_delucastkey(ni);
1273 }
1274 
1275 static void
1276 node_free(struct ieee80211_node *ni)
1277 {
1278 	struct ieee80211com *ic = ni->ni_ic;
1279 
1280 	ieee80211_ratectl_node_deinit(ni);
1281 	ic->ic_node_cleanup(ni);
1282 	ieee80211_ies_cleanup(&ni->ni_ies);
1283 	ieee80211_psq_cleanup(&ni->ni_psq);
1284 	IEEE80211_FREE(ni, M_80211_NODE);
1285 }
1286 
1287 static void
1288 node_age(struct ieee80211_node *ni)
1289 {
1290 	struct ieee80211vap *vap = ni->ni_vap;
1291 
1292 	/*
1293 	 * Age frames on the power save queue.
1294 	 */
1295 	if (ieee80211_node_psq_age(ni) != 0 &&
1296 	    ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
1297 		vap->iv_set_tim(ni, 0);
1298 	/*
1299 	 * Age out HT resources (e.g. frames on the
1300 	 * A-MPDU reorder queues).
1301 	 */
1302 	if (ni->ni_associd != 0 && (ni->ni_flags & IEEE80211_NODE_HT))
1303 		ieee80211_ht_node_age(ni);
1304 }
1305 
1306 static int8_t
1307 node_getrssi(const struct ieee80211_node *ni)
1308 {
1309 	uint32_t avgrssi = ni->ni_avgrssi;
1310 	int32_t rssi;
1311 
1312 	if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER)
1313 		return 0;
1314 	rssi = IEEE80211_RSSI_GET(avgrssi);
1315 	return rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
1316 }
1317 
1318 static void
1319 node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
1320 {
1321 	*rssi = node_getrssi(ni);
1322 	*noise = ni->ni_noise;
1323 }
1324 
1325 static void
1326 node_getmimoinfo(const struct ieee80211_node *ni,
1327 	struct ieee80211_mimo_info *info)
1328 {
1329 	int i;
1330 	uint32_t avgrssi;
1331 	int32_t rssi;
1332 
1333 	bzero(info, sizeof(*info));
1334 
1335 	for (i = 0; i < MIN(IEEE80211_MAX_CHAINS, ni->ni_mimo_chains); i++) {
1336 		/* Note: for now, just pri20 channel info */
1337 		avgrssi = ni->ni_mimo_rssi_ctl[i];
1338 		if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER) {
1339 			info->ch[i].rssi[0] = 0;
1340 		} else {
1341 			rssi = IEEE80211_RSSI_GET(avgrssi);
1342 			info->ch[i].rssi[0] = rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
1343 		}
1344 		info->ch[i].noise[0] = ni->ni_mimo_noise_ctl[i];
1345 	}
1346 
1347 	/* XXX ext radios? */
1348 
1349 	/* XXX EVM? */
1350 }
1351 
1352 static void
1353 ieee80211_add_node_nt(struct ieee80211_node_table *nt,
1354     struct ieee80211_node *ni)
1355 {
1356 	struct ieee80211com *ic = nt->nt_ic;
1357 	int hash;
1358 
1359 	IEEE80211_NODE_LOCK_ASSERT(nt);
1360 
1361 	hash = IEEE80211_NODE_HASH(ic, ni->ni_macaddr);
1362 	(void) ic;	/* XXX IEEE80211_NODE_HASH */
1363 	TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
1364 	LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
1365 	nt->nt_count++;
1366 	ni->ni_table = nt;
1367 }
1368 
1369 static void
1370 ieee80211_del_node_nt(struct ieee80211_node_table *nt,
1371     struct ieee80211_node *ni)
1372 {
1373 
1374 	IEEE80211_NODE_LOCK_ASSERT(nt);
1375 
1376 	TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
1377 	LIST_REMOVE(ni, ni_hash);
1378 	nt->nt_count--;
1379 	KASSERT(nt->nt_count >= 0,
1380 	    ("nt_count is negative (%d)!\n", nt->nt_count));
1381 	ni->ni_table = NULL;
1382 }
1383 
1384 struct ieee80211_node *
1385 ieee80211_alloc_node(struct ieee80211_node_table *nt,
1386 	struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
1387 {
1388 	struct ieee80211com *ic = nt->nt_ic;
1389 	struct ieee80211_node *ni;
1390 
1391 	ni = ic->ic_node_alloc(vap, macaddr);
1392 	if (ni == NULL) {
1393 		vap->iv_stats.is_rx_nodealloc++;
1394 		return NULL;
1395 	}
1396 
1397 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1398 		"%s %p<%s> in %s table\n", __func__, ni,
1399 		ether_sprintf(macaddr), nt->nt_name);
1400 
1401 	IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
1402 	ieee80211_node_initref(ni);		/* mark referenced */
1403 	ni->ni_chan = IEEE80211_CHAN_ANYC;
1404 	ni->ni_authmode = IEEE80211_AUTH_OPEN;
1405 	ni->ni_txpower = ic->ic_txpowlimit;	/* max power */
1406 	ni->ni_txparms = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
1407 	ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
1408 	ni->ni_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
1409 	ni->ni_inact_reload = nt->nt_inact_init;
1410 	ni->ni_inact = ni->ni_inact_reload;
1411 	ni->ni_ath_defkeyix = 0x7fff;
1412 	ieee80211_psq_init(&ni->ni_psq, "unknown");
1413 #ifdef IEEE80211_SUPPORT_MESH
1414 	if (vap->iv_opmode == IEEE80211_M_MBSS)
1415 		ieee80211_mesh_node_init(vap, ni);
1416 #endif
1417 	IEEE80211_NODE_LOCK(nt);
1418 	ieee80211_add_node_nt(nt, ni);
1419 	ni->ni_vap = vap;
1420 	ni->ni_ic = ic;
1421 	IEEE80211_NODE_UNLOCK(nt);
1422 
1423 	/* handle failure; free node state */
1424 	if (ic->ic_node_init(ni) != 0) {
1425 		vap->iv_stats.is_rx_nodealloc++;
1426 		ieee80211_psq_cleanup(&ni->ni_psq);
1427 		ieee80211_ratectl_node_deinit(ni);
1428 		_ieee80211_free_node(ni);
1429 		return NULL;
1430 	}
1431 
1432 	IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
1433 	    "%s: inact_reload %u", __func__, ni->ni_inact_reload);
1434 
1435 	return ni;
1436 }
1437 
1438 /*
1439  * Craft a temporary node suitable for sending a management frame
1440  * to the specified station.  We craft only as much state as we
1441  * need to do the work since the node will be immediately reclaimed
1442  * once the send completes.
1443  */
1444 struct ieee80211_node *
1445 ieee80211_tmp_node(struct ieee80211vap *vap,
1446 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1447 {
1448 	struct ieee80211com *ic = vap->iv_ic;
1449 	struct ieee80211_node *ni;
1450 
1451 	ni = ic->ic_node_alloc(vap, macaddr);
1452 	if (ni != NULL) {
1453 		struct ieee80211_node *bss = vap->iv_bss;
1454 
1455 		IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1456 			"%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
1457 
1458 		ni->ni_table = NULL;		/* NB: pedantic */
1459 		ni->ni_ic = ic;			/* NB: needed to set channel */
1460 		ni->ni_vap = vap;
1461 
1462 		IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
1463 		IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
1464 		ieee80211_node_initref(ni);		/* mark referenced */
1465 		/* NB: required by ieee80211_fix_rate */
1466 		ieee80211_node_set_chan(ni, bss->ni_chan);
1467 		ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
1468 			IEEE80211_KEYIX_NONE);
1469 		ni->ni_txpower = bss->ni_txpower;
1470 		/* XXX optimize away */
1471 		ieee80211_psq_init(&ni->ni_psq, "unknown");
1472 
1473 		ieee80211_ratectl_node_init(ni);
1474 
1475 		/* handle failure; free node state */
1476 		if (ic->ic_node_init(ni) != 0) {
1477 			vap->iv_stats.is_rx_nodealloc++;
1478 			ieee80211_psq_cleanup(&ni->ni_psq);
1479 			ieee80211_ratectl_node_deinit(ni);
1480 			_ieee80211_free_node(ni);
1481 			return NULL;
1482 		}
1483 
1484 	} else {
1485 		/* XXX msg */
1486 		vap->iv_stats.is_rx_nodealloc++;
1487 	}
1488 	return ni;
1489 }
1490 
1491 struct ieee80211_node *
1492 ieee80211_dup_bss(struct ieee80211vap *vap,
1493 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1494 {
1495 	struct ieee80211com *ic = vap->iv_ic;
1496 	struct ieee80211_node *ni;
1497 
1498 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, macaddr);
1499 	if (ni != NULL) {
1500 		struct ieee80211_node *bss = vap->iv_bss;
1501 		/*
1502 		 * Inherit from iv_bss.
1503 		 */
1504 		copy_bss(ni, bss);
1505 		IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
1506 		ieee80211_node_set_chan(ni, bss->ni_chan);
1507 	}
1508 	return ni;
1509 }
1510 
1511 /*
1512  * Create a bss node for a legacy WDS vap.  The far end does
1513  * not associate so we just create create a new node and
1514  * simulate an association.  The caller is responsible for
1515  * installing the node as the bss node and handling any further
1516  * setup work like authorizing the port.
1517  */
1518 struct ieee80211_node *
1519 ieee80211_node_create_wds(struct ieee80211vap *vap,
1520 	const uint8_t bssid[IEEE80211_ADDR_LEN], struct ieee80211_channel *chan)
1521 {
1522 	struct ieee80211com *ic = vap->iv_ic;
1523 	struct ieee80211_node *ni;
1524 
1525 	/* XXX check if node already in sta table? */
1526 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, bssid);
1527 	if (ni != NULL) {
1528 		ni->ni_wdsvap = vap;
1529 		IEEE80211_ADDR_COPY(ni->ni_bssid, bssid);
1530 		/*
1531 		 * Inherit any manually configured settings.
1532 		 */
1533 		copy_bss(ni, vap->iv_bss);
1534 		ieee80211_node_set_chan(ni, chan);
1535 		/* NB: propagate ssid so available to WPA supplicant */
1536 		ni->ni_esslen = vap->iv_des_ssid[0].len;
1537 		memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
1538 		/* NB: no associd for peer */
1539 		/*
1540 		 * There are no management frames to use to
1541 		 * discover neighbor capabilities, so blindly
1542 		 * propagate the local configuration.
1543 		 */
1544 		if (vap->iv_flags & IEEE80211_F_WME)
1545 			ni->ni_flags |= IEEE80211_NODE_QOS;
1546 #ifdef IEEE80211_SUPPORT_SUPERG
1547 		if (vap->iv_flags & IEEE80211_F_FF)
1548 			ni->ni_flags |= IEEE80211_NODE_FF;
1549 #endif
1550 		/* XXX VHT */
1551 		if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
1552 		    (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1553 			/*
1554 			 * Device is HT-capable and HT is enabled for
1555 			 * the vap; setup HT operation.  On return
1556 			 * ni_chan will be adjusted to an HT channel.
1557 			 */
1558 			ieee80211_ht_wds_init(ni);
1559 			if (vap->iv_flags_vht & IEEE80211_FVHT_VHT) {
1560 				printf("%s: TODO: vht_wds_init\n", __func__);
1561 			}
1562 		} else {
1563 			struct ieee80211_channel *c = ni->ni_chan;
1564 			/*
1565 			 * Force a legacy channel to be used.
1566 			 */
1567 			c = ieee80211_find_channel(ic,
1568 			    c->ic_freq, c->ic_flags &~ IEEE80211_CHAN_HT);
1569 			KASSERT(c != NULL, ("no legacy channel, %u/%x",
1570 			    ni->ni_chan->ic_freq, ni->ni_chan->ic_flags));
1571 			ni->ni_chan = c;
1572 		}
1573 	}
1574 	return ni;
1575 }
1576 
1577 struct ieee80211_node *
1578 #ifdef IEEE80211_DEBUG_REFCNT
1579 ieee80211_find_node_locked_debug(struct ieee80211_node_table *nt,
1580 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1581 #else
1582 ieee80211_find_node_locked(struct ieee80211_node_table *nt,
1583 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1584 #endif
1585 {
1586 	struct ieee80211_node *ni;
1587 	int hash;
1588 
1589 	IEEE80211_NODE_LOCK_ASSERT(nt);
1590 
1591 	hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
1592 	LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1593 		if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
1594 			ieee80211_ref_node(ni);	/* mark referenced */
1595 #ifdef IEEE80211_DEBUG_REFCNT
1596 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1597 			    "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1598 			    func, line,
1599 			    ni, ether_sprintf(ni->ni_macaddr),
1600 			    ieee80211_node_refcnt(ni));
1601 #endif
1602 			return ni;
1603 		}
1604 	}
1605 	return NULL;
1606 }
1607 
1608 struct ieee80211_node *
1609 #ifdef IEEE80211_DEBUG_REFCNT
1610 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
1611 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1612 #else
1613 ieee80211_find_node(struct ieee80211_node_table *nt,
1614 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1615 #endif
1616 {
1617 	struct ieee80211_node *ni;
1618 
1619 	IEEE80211_NODE_LOCK(nt);
1620 	ni = ieee80211_find_node_locked(nt, macaddr);
1621 	IEEE80211_NODE_UNLOCK(nt);
1622 	return ni;
1623 }
1624 
1625 struct ieee80211_node *
1626 #ifdef IEEE80211_DEBUG_REFCNT
1627 ieee80211_find_vap_node_locked_debug(struct ieee80211_node_table *nt,
1628 	const struct ieee80211vap *vap,
1629 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1630 #else
1631 ieee80211_find_vap_node_locked(struct ieee80211_node_table *nt,
1632 	const struct ieee80211vap *vap,
1633 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1634 #endif
1635 {
1636 	struct ieee80211_node *ni;
1637 	int hash;
1638 
1639 	IEEE80211_NODE_LOCK_ASSERT(nt);
1640 
1641 	hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
1642 	LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1643 		if (ni->ni_vap == vap &&
1644 		    IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
1645 			ieee80211_ref_node(ni);	/* mark referenced */
1646 #ifdef IEEE80211_DEBUG_REFCNT
1647 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1648 			    "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1649 			    func, line,
1650 			    ni, ether_sprintf(ni->ni_macaddr),
1651 			    ieee80211_node_refcnt(ni));
1652 #endif
1653 			return ni;
1654 		}
1655 	}
1656 	return NULL;
1657 }
1658 
1659 struct ieee80211_node *
1660 #ifdef IEEE80211_DEBUG_REFCNT
1661 ieee80211_find_vap_node_debug(struct ieee80211_node_table *nt,
1662 	const struct ieee80211vap *vap,
1663 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1664 #else
1665 ieee80211_find_vap_node(struct ieee80211_node_table *nt,
1666 	const struct ieee80211vap *vap,
1667 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1668 #endif
1669 {
1670 	struct ieee80211_node *ni;
1671 
1672 	IEEE80211_NODE_LOCK(nt);
1673 	ni = ieee80211_find_vap_node_locked(nt, vap, macaddr);
1674 	IEEE80211_NODE_UNLOCK(nt);
1675 	return ni;
1676 }
1677 
1678 /*
1679  * Fake up a node; this handles node discovery in adhoc mode.
1680  * Note that for the driver's benefit we we treat this like
1681  * an association so the driver has an opportunity to setup
1682  * it's private state.
1683  */
1684 struct ieee80211_node *
1685 ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
1686 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1687 {
1688 	struct ieee80211_node *ni;
1689 
1690 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE | IEEE80211_MSG_ASSOC,
1691 	    "%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
1692 	ni = ieee80211_dup_bss(vap, macaddr);
1693 	if (ni != NULL) {
1694 		struct ieee80211com *ic = vap->iv_ic;
1695 
1696 		/* XXX no rate negotiation; just dup */
1697 		ni->ni_rates = vap->iv_bss->ni_rates;
1698 		if (ieee80211_iserp_rateset(&ni->ni_rates))
1699 			ni->ni_flags |= IEEE80211_NODE_ERP;
1700 		if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
1701 			/*
1702 			 * In adhoc demo mode there are no management
1703 			 * frames to use to discover neighbor capabilities,
1704 			 * so blindly propagate the local configuration
1705 			 * so we can do interesting things (e.g. use
1706 			 * WME to disable ACK's).
1707 			 */
1708 			/*
1709 			 * XXX TODO: 11n?
1710 			 */
1711 			if (vap->iv_flags & IEEE80211_F_WME)
1712 				ni->ni_flags |= IEEE80211_NODE_QOS;
1713 #ifdef IEEE80211_SUPPORT_SUPERG
1714 			if (vap->iv_flags & IEEE80211_F_FF)
1715 				ni->ni_flags |= IEEE80211_NODE_FF;
1716 #endif
1717 		}
1718 		ieee80211_node_setuptxparms(ni);
1719 		ieee80211_ratectl_node_init(ni);
1720 
1721 		/*
1722 		 * XXX TODO: 11n? At least 20MHz, at least A-MPDU RX,
1723 		 * not A-MPDU TX; not 11n rates, etc.  We'll cycle
1724 		 * that after we hear that we can indeed do 11n
1725 		 * (either by a beacon frame or by a probe response.)
1726 		 */
1727 
1728 		/*
1729 		 * This is the first time we see the node.
1730 		 */
1731 		if (ic->ic_newassoc != NULL)
1732 			ic->ic_newassoc(ni, 1);
1733 
1734 		/*
1735 		 * Kick off a probe request to the given node;
1736 		 * we will then use the probe response to update
1737 		 * 11n/etc configuration state.
1738 		 *
1739 		 * XXX TODO: this isn't guaranteed, and until we get
1740 		 * a probe response, we won't be able to actually
1741 		 * do anything 802.11n related to the node.
1742 		 * So if this does indeed work, maybe we should hold
1743 		 * off on sending responses until we get the probe
1744 		 * response, or just default to some sensible subset
1745 		 * of 802.11n behaviour (eg always allow aggregation
1746 		 * negotiation TO us, but not FROM us, etc) so we
1747 		 * aren't entirely busted.
1748 		 */
1749 		if (vap->iv_opmode == IEEE80211_M_IBSS) {
1750 			ieee80211_send_probereq(ni, /* node */
1751 				vap->iv_myaddr, /* SA */
1752 				ni->ni_macaddr, /* DA */
1753 				vap->iv_bss->ni_bssid, /* BSSID */
1754 				vap->iv_bss->ni_essid,
1755 				vap->iv_bss->ni_esslen); /* SSID */
1756 		}
1757 
1758 		/* XXX not right for 802.1x/WPA */
1759 		ieee80211_node_authorize(ni);
1760 	}
1761 	return ni;
1762 }
1763 
1764 void
1765 ieee80211_init_neighbor(struct ieee80211_node *ni,
1766 	const struct ieee80211_frame *wh,
1767 	const struct ieee80211_scanparams *sp)
1768 {
1769 	int do_ht_setup = 0, do_vht_setup = 0;
1770 
1771 	ni->ni_esslen = sp->ssid[1];
1772 	memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
1773 	IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
1774 	memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
1775 	ni->ni_intval = sp->bintval;
1776 	ni->ni_capinfo = sp->capinfo;
1777 	ni->ni_chan = ni->ni_ic->ic_curchan;
1778 	ni->ni_fhdwell = sp->fhdwell;
1779 	ni->ni_fhindex = sp->fhindex;
1780 	ni->ni_erp = sp->erp;
1781 	ni->ni_timoff = sp->timoff;
1782 #ifdef IEEE80211_SUPPORT_MESH
1783 	if (ni->ni_vap->iv_opmode == IEEE80211_M_MBSS)
1784 		ieee80211_mesh_init_neighbor(ni, wh, sp);
1785 #endif
1786 	if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
1787 		ieee80211_ies_expand(&ni->ni_ies);
1788 		if (ni->ni_ies.wme_ie != NULL)
1789 			ni->ni_flags |= IEEE80211_NODE_QOS;
1790 		else
1791 			ni->ni_flags &= ~IEEE80211_NODE_QOS;
1792 #ifdef IEEE80211_SUPPORT_SUPERG
1793 		if (ni->ni_ies.ath_ie != NULL)
1794 			ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
1795 #endif
1796 		if (ni->ni_ies.htcap_ie != NULL)
1797 			ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
1798 		if (ni->ni_ies.htinfo_ie != NULL)
1799 			ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
1800 
1801 		if (ni->ni_ies.vhtcap_ie != NULL)
1802 			ieee80211_parse_vhtcap(ni, ni->ni_ies.vhtcap_ie);
1803 		if (ni->ni_ies.vhtopmode_ie != NULL)
1804 			ieee80211_parse_vhtopmode(ni, ni->ni_ies.vhtopmode_ie);
1805 
1806 		if ((ni->ni_ies.htcap_ie != NULL) &&
1807 		    (ni->ni_ies.htinfo_ie != NULL) &&
1808 		    (ni->ni_vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1809 			do_ht_setup = 1;
1810 		}
1811 
1812 		if ((ni->ni_ies.vhtcap_ie != NULL) &&
1813 		    (ni->ni_ies.vhtopmode_ie != NULL) &&
1814 		    (ni->ni_vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1815 			do_vht_setup = 1;
1816 		}
1817 	}
1818 
1819 	/* NB: must be after ni_chan is setup */
1820 	ieee80211_setup_rates(ni, sp->rates, sp->xrates,
1821 		IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1822 		IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1823 
1824 	/*
1825 	 * If the neighbor is HT compatible, flip that on.
1826 	 */
1827 	if (do_ht_setup) {
1828 		IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
1829 		    "%s: doing HT setup\n", __func__);
1830 		ieee80211_ht_node_init(ni);
1831 		ieee80211_ht_updateparams(ni,
1832 		    ni->ni_ies.htcap_ie,
1833 		    ni->ni_ies.htinfo_ie);
1834 
1835 		if (do_vht_setup) {
1836 			if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1837 				printf("%s: BSS %6D: 2GHz channel, VHT info; ignoring\n",
1838 				    __func__,
1839 				    ni->ni_macaddr,
1840 				    ":");
1841 			} else {
1842 				ieee80211_vht_node_init(ni);
1843 				ieee80211_vht_updateparams(ni,
1844 				    ni->ni_ies.vhtcap_ie,
1845 				    ni->ni_ies.vhtopmode_ie);
1846 				ieee80211_setup_vht_rates(ni,
1847 				    ni->ni_ies.vhtcap_ie,
1848 				    ni->ni_ies.vhtopmode_ie);
1849 			}
1850 		}
1851 
1852 		/*
1853 		 * Finally do the channel upgrade/change based
1854 		 * on the HT/VHT configuration.
1855 		 */
1856 		ieee80211_ht_updateparams_final(ni, ni->ni_ies.htcap_ie,
1857 		    ni->ni_ies.htinfo_ie);
1858 		ieee80211_setup_htrates(ni,
1859 		    ni->ni_ies.htcap_ie,
1860 		    IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1861 		ieee80211_setup_basic_htrates(ni,
1862 		    ni->ni_ies.htinfo_ie);
1863 
1864 		ieee80211_node_setuptxparms(ni);
1865 		ieee80211_ratectl_node_init(ni);
1866 
1867 		/* Reassociate; we're now 11n/11ac */
1868 		/*
1869 		 * XXX TODO: this is the wrong thing to do -
1870 		 * we're calling it with isnew=1 so the ath(4)
1871 		 * driver reinitialises the rate tables.
1872 		 * This "mostly" works for ath(4), but it won't
1873 		 * be right for firmware devices which allocate
1874 		 * node states.
1875 		 *
1876 		 * So, do we just create a new node and delete
1877 		 * the old one? Or?
1878 		 */
1879 		if (ni->ni_ic->ic_newassoc)
1880 			ni->ni_ic->ic_newassoc(ni, 1);
1881 	}
1882 }
1883 
1884 /*
1885  * Do node discovery in adhoc mode on receipt of a beacon
1886  * or probe response frame.  Note that for the driver's
1887  * benefit we we treat this like an association so the
1888  * driver has an opportunity to setup it's private state.
1889  */
1890 struct ieee80211_node *
1891 ieee80211_add_neighbor(struct ieee80211vap *vap,
1892 	const struct ieee80211_frame *wh,
1893 	const struct ieee80211_scanparams *sp)
1894 {
1895 	struct ieee80211_node *ni;
1896 
1897 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
1898 	    "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
1899 	ni = ieee80211_dup_bss(vap, wh->i_addr2);/* XXX alloc_node? */
1900 	if (ni != NULL) {
1901 		struct ieee80211com *ic = vap->iv_ic;
1902 
1903 		ieee80211_init_neighbor(ni, wh, sp);
1904 		if (ieee80211_iserp_rateset(&ni->ni_rates))
1905 			ni->ni_flags |= IEEE80211_NODE_ERP;
1906 		ieee80211_node_setuptxparms(ni);
1907 		ieee80211_ratectl_node_init(ni);
1908 		if (ic->ic_newassoc != NULL)
1909 			ic->ic_newassoc(ni, 1);
1910 		/* XXX not right for 802.1x/WPA */
1911 		ieee80211_node_authorize(ni);
1912 	}
1913 	return ni;
1914 }
1915 
1916 #define	IS_PROBEREQ(wh) \
1917 	((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK|IEEE80211_FC0_SUBTYPE_MASK)) \
1918 	    == (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
1919 #define	IS_BCAST_PROBEREQ(wh) \
1920 	(IS_PROBEREQ(wh) && IEEE80211_IS_MULTICAST( \
1921 	    ((const struct ieee80211_frame *)(wh))->i_addr3))
1922 
1923 static __inline struct ieee80211_node *
1924 _find_rxnode(struct ieee80211_node_table *nt,
1925     const struct ieee80211_frame_min *wh)
1926 {
1927 	if (IS_BCAST_PROBEREQ(wh))
1928 		return NULL;		/* spam bcast probe req to all vap's */
1929 	return ieee80211_find_node_locked(nt, wh->i_addr2);
1930 }
1931 
1932 /*
1933  * Locate the node for sender, track state, and then pass the
1934  * (referenced) node up to the 802.11 layer for its use.  Note
1935  * we can return NULL if the sender is not in the table.
1936  */
1937 struct ieee80211_node *
1938 #ifdef IEEE80211_DEBUG_REFCNT
1939 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
1940 	const struct ieee80211_frame_min *wh, const char *func, int line)
1941 #else
1942 ieee80211_find_rxnode(struct ieee80211com *ic,
1943 	const struct ieee80211_frame_min *wh)
1944 #endif
1945 {
1946 	struct ieee80211_node_table *nt;
1947 	struct ieee80211_node *ni;
1948 
1949 	nt = &ic->ic_sta;
1950 	IEEE80211_NODE_LOCK(nt);
1951 	ni = _find_rxnode(nt, wh);
1952 	IEEE80211_NODE_UNLOCK(nt);
1953 
1954 	return ni;
1955 }
1956 
1957 /*
1958  * Like ieee80211_find_rxnode but use the supplied h/w
1959  * key index as a hint to locate the node in the key
1960  * mapping table.  If an entry is present at the key
1961  * index we return it; otherwise do a normal lookup and
1962  * update the mapping table if the station has a unicast
1963  * key assigned to it.
1964  */
1965 struct ieee80211_node *
1966 #ifdef IEEE80211_DEBUG_REFCNT
1967 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
1968 	const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
1969 	const char *func, int line)
1970 #else
1971 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
1972 	const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
1973 #endif
1974 {
1975 	struct ieee80211_node_table *nt;
1976 	struct ieee80211_node *ni;
1977 
1978 	nt = &ic->ic_sta;
1979 	IEEE80211_NODE_LOCK(nt);
1980 	if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
1981 		ni = nt->nt_keyixmap[keyix];
1982 	else
1983 		ni = NULL;
1984 	if (ni == NULL) {
1985 		ni = _find_rxnode(nt, wh);
1986 		if (ni != NULL && nt->nt_keyixmap != NULL) {
1987 			/*
1988 			 * If the station has a unicast key cache slot
1989 			 * assigned update the key->node mapping table.
1990 			 */
1991 			keyix = ni->ni_ucastkey.wk_rxkeyix;
1992 			/* XXX can keyixmap[keyix] != NULL? */
1993 			if (keyix < nt->nt_keyixmax &&
1994 			    nt->nt_keyixmap[keyix] == NULL) {
1995 				IEEE80211_DPRINTF(ni->ni_vap,
1996 				    IEEE80211_MSG_NODE,
1997 				    "%s: add key map entry %p<%s> refcnt %d\n",
1998 				    __func__, ni, ether_sprintf(ni->ni_macaddr),
1999 				    ieee80211_node_refcnt(ni)+1);
2000 				nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
2001 			}
2002 		}
2003 	} else {
2004 		if (IS_BCAST_PROBEREQ(wh))
2005 			ni = NULL;	/* spam bcast probe req to all vap's */
2006 		else
2007 			ieee80211_ref_node(ni);
2008 	}
2009 	IEEE80211_NODE_UNLOCK(nt);
2010 
2011 	return ni;
2012 }
2013 #undef IS_BCAST_PROBEREQ
2014 #undef IS_PROBEREQ
2015 
2016 /*
2017  * Return a reference to the appropriate node for sending
2018  * a data frame.  This handles node discovery in adhoc networks.
2019  */
2020 struct ieee80211_node *
2021 #ifdef IEEE80211_DEBUG_REFCNT
2022 ieee80211_find_txnode_debug(struct ieee80211vap *vap,
2023 	const uint8_t macaddr[IEEE80211_ADDR_LEN],
2024 	const char *func, int line)
2025 #else
2026 ieee80211_find_txnode(struct ieee80211vap *vap,
2027 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
2028 #endif
2029 {
2030 	struct ieee80211_node_table *nt = &vap->iv_ic->ic_sta;
2031 	struct ieee80211_node *ni;
2032 
2033 	/*
2034 	 * The destination address should be in the node table
2035 	 * unless this is a multicast/broadcast frame.  We can
2036 	 * also optimize station mode operation, all frames go
2037 	 * to the bss node.
2038 	 */
2039 	/* XXX can't hold lock across dup_bss 'cuz of recursive locking */
2040 	IEEE80211_NODE_LOCK(nt);
2041 	if (vap->iv_opmode == IEEE80211_M_STA ||
2042 	    vap->iv_opmode == IEEE80211_M_WDS ||
2043 	    IEEE80211_IS_MULTICAST(macaddr))
2044 		ni = ieee80211_ref_node(vap->iv_bss);
2045 	else
2046 		ni = ieee80211_find_node_locked(nt, macaddr);
2047 	IEEE80211_NODE_UNLOCK(nt);
2048 
2049 	if (ni == NULL) {
2050 		if (vap->iv_opmode == IEEE80211_M_IBSS ||
2051 		    vap->iv_opmode == IEEE80211_M_AHDEMO) {
2052 			/*
2053 			 * In adhoc mode cons up a node for the destination.
2054 			 * Note that we need an additional reference for the
2055 			 * caller to be consistent with
2056 			 * ieee80211_find_node_locked.
2057 			 */
2058 			/*
2059 			 * XXX TODO: this doesn't fake up 11n state; we need
2060 			 * to find another way to get it upgraded.
2061 			 */
2062 			ni = ieee80211_fakeup_adhoc_node(vap, macaddr);
2063 			if (ni != NULL)
2064 				(void) ieee80211_ref_node(ni);
2065 		} else {
2066 			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, macaddr,
2067 			    "no node, discard frame (%s)", __func__);
2068 			vap->iv_stats.is_tx_nonode++;
2069 		}
2070 	}
2071 	return ni;
2072 }
2073 
2074 static void
2075 _ieee80211_free_node(struct ieee80211_node *ni)
2076 {
2077 	struct ieee80211_node_table *nt = ni->ni_table;
2078 
2079 	/*
2080 	 * NB: careful about referencing the vap as it may be
2081 	 * gone if the last reference was held by a driver.
2082 	 * We know the com will always be present so it's safe
2083 	 * to use ni_ic below to reclaim resources.
2084 	 */
2085 #if 0
2086 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2087 		"%s %p<%s> in %s table\n", __func__, ni,
2088 		ether_sprintf(ni->ni_macaddr),
2089 		nt != NULL ? nt->nt_name : "<gone>");
2090 #endif
2091 	if (ni->ni_associd != 0) {
2092 		struct ieee80211vap *vap = ni->ni_vap;
2093 		if (vap->iv_aid_bitmap != NULL)
2094 			IEEE80211_AID_CLR(vap, ni->ni_associd);
2095 	}
2096 	if (nt != NULL)
2097 		ieee80211_del_node_nt(nt, ni);
2098 	ni->ni_ic->ic_node_free(ni);
2099 }
2100 
2101 /*
2102  * Clear any entry in the unicast key mapping table.
2103  */
2104 static int
2105 node_clear_keyixmap(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
2106 {
2107 	ieee80211_keyix keyix;
2108 
2109 	keyix = ni->ni_ucastkey.wk_rxkeyix;
2110 	if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
2111 	    nt->nt_keyixmap[keyix] == ni) {
2112 		IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
2113 			"%s: %p<%s> clear key map entry %u\n",
2114 			__func__, ni, ether_sprintf(ni->ni_macaddr), keyix);
2115 		nt->nt_keyixmap[keyix] = NULL;
2116 		ieee80211_node_decref(ni);
2117 		return 1;
2118 	}
2119 
2120 	return 0;
2121 }
2122 
2123 void
2124 #ifdef IEEE80211_DEBUG_REFCNT
2125 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
2126 #else
2127 ieee80211_free_node(struct ieee80211_node *ni)
2128 #endif
2129 {
2130 	struct ieee80211_node_table *nt = ni->ni_table;
2131 
2132 #ifdef IEEE80211_DEBUG_REFCNT
2133 	IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
2134 		"%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
2135 		 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
2136 #endif
2137 	if (nt != NULL) {
2138 		IEEE80211_NODE_LOCK(nt);
2139 		if (ieee80211_node_dectestref(ni)) {
2140 			/*
2141 			 * Last reference, reclaim state.
2142 			 */
2143 			_ieee80211_free_node(ni);
2144 		} else if (ieee80211_node_refcnt(ni) == 1)
2145 			if (node_clear_keyixmap(nt, ni))
2146 				_ieee80211_free_node(ni);
2147 		IEEE80211_NODE_UNLOCK(nt);
2148 	} else {
2149 		if (ieee80211_node_dectestref(ni))
2150 			_ieee80211_free_node(ni);
2151 	}
2152 }
2153 
2154 /*
2155  * Reclaim a unicast key and clear any key cache state.
2156  */
2157 int
2158 ieee80211_node_delucastkey(struct ieee80211_node *ni)
2159 {
2160 	struct ieee80211com *ic = ni->ni_ic;
2161 	struct ieee80211_node_table *nt = &ic->ic_sta;
2162 	struct ieee80211_node *nikey;
2163 	ieee80211_keyix keyix;
2164 	int isowned, status;
2165 
2166 	/*
2167 	 * NB: We must beware of LOR here; deleting the key
2168 	 * can cause the crypto layer to block traffic updates
2169 	 * which can generate a LOR against the node table lock;
2170 	 * grab it here and stash the key index for our use below.
2171 	 *
2172 	 * Must also beware of recursion on the node table lock.
2173 	 * When called from node_cleanup we may already have
2174 	 * the node table lock held.  Unfortunately there's no
2175 	 * way to separate out this path so we must do this
2176 	 * conditionally.
2177 	 */
2178 	isowned = IEEE80211_NODE_IS_LOCKED(nt);
2179 	if (!isowned)
2180 		IEEE80211_NODE_LOCK(nt);
2181 	nikey = NULL;
2182 	status = 1;		/* NB: success */
2183 	if (ni->ni_ucastkey.wk_keyix != IEEE80211_KEYIX_NONE) {
2184 		keyix = ni->ni_ucastkey.wk_rxkeyix;
2185 		status = ieee80211_crypto_delkey(ni->ni_vap, &ni->ni_ucastkey);
2186 		if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
2187 			nikey = nt->nt_keyixmap[keyix];
2188 			nt->nt_keyixmap[keyix] = NULL;
2189 		}
2190 	}
2191 	if (!isowned)
2192 		IEEE80211_NODE_UNLOCK(nt);
2193 
2194 	if (nikey != NULL) {
2195 		KASSERT(nikey == ni,
2196 			("key map out of sync, ni %p nikey %p", ni, nikey));
2197 		IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
2198 			"%s: delete key map entry %p<%s> refcnt %d\n",
2199 			__func__, ni, ether_sprintf(ni->ni_macaddr),
2200 			ieee80211_node_refcnt(ni)-1);
2201 		ieee80211_free_node(ni);
2202 	}
2203 	return status;
2204 }
2205 
2206 /*
2207  * Reclaim a node.  If this is the last reference count then
2208  * do the normal free work.  Otherwise remove it from the node
2209  * table and mark it gone by clearing the back-reference.
2210  */
2211 static void
2212 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
2213 {
2214 
2215 	IEEE80211_NODE_LOCK_ASSERT(nt);
2216 
2217 	IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
2218 		"%s: remove %p<%s> from %s table, refcnt %d\n",
2219 		__func__, ni, ether_sprintf(ni->ni_macaddr),
2220 		nt->nt_name, ieee80211_node_refcnt(ni)-1);
2221 	/*
2222 	 * Clear any entry in the unicast key mapping table.
2223 	 * We need to do it here so rx lookups don't find it
2224 	 * in the mapping table even if it's not in the hash
2225 	 * table.  We cannot depend on the mapping table entry
2226 	 * being cleared because the node may not be free'd.
2227 	 */
2228 	(void)node_clear_keyixmap(nt, ni);
2229 	if (!ieee80211_node_dectestref(ni)) {
2230 		/*
2231 		 * Other references are present, just remove the
2232 		 * node from the table so it cannot be found.  When
2233 		 * the references are dropped storage will be
2234 		 * reclaimed.
2235 		 */
2236 		ieee80211_del_node_nt(nt, ni);
2237 	} else
2238 		_ieee80211_free_node(ni);
2239 }
2240 
2241 /*
2242  * Node table support.
2243  */
2244 
2245 static void
2246 ieee80211_node_table_init(struct ieee80211com *ic,
2247 	struct ieee80211_node_table *nt,
2248 	const char *name, int inact, int keyixmax)
2249 {
2250 
2251 	nt->nt_ic = ic;
2252 	IEEE80211_NODE_LOCK_INIT(nt, ic->ic_name);
2253 	TAILQ_INIT(&nt->nt_node);
2254 	nt->nt_count = 0;
2255 	nt->nt_name = name;
2256 	nt->nt_inact_init = inact;
2257 	nt->nt_keyixmax = keyixmax;
2258 	if (nt->nt_keyixmax > 0) {
2259 		nt->nt_keyixmap = (struct ieee80211_node **) IEEE80211_MALLOC(
2260 			keyixmax * sizeof(struct ieee80211_node *),
2261 			M_80211_NODE,
2262 			IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
2263 		if (nt->nt_keyixmap == NULL)
2264 			ic_printf(ic,
2265 			    "Cannot allocate key index map with %u entries\n",
2266 			    keyixmax);
2267 	} else
2268 		nt->nt_keyixmap = NULL;
2269 }
2270 
2271 static void
2272 ieee80211_node_table_reset(struct ieee80211_node_table *nt,
2273 	struct ieee80211vap *match)
2274 {
2275 	struct ieee80211_node *ni, *next;
2276 
2277 	IEEE80211_NODE_LOCK(nt);
2278 	TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
2279 		if (match != NULL && ni->ni_vap != match)
2280 			continue;
2281 		/* XXX can this happen?  if so need's work */
2282 		if (ni->ni_associd != 0) {
2283 			struct ieee80211vap *vap = ni->ni_vap;
2284 
2285 			if (vap->iv_auth->ia_node_leave != NULL)
2286 				vap->iv_auth->ia_node_leave(ni);
2287 			if (vap->iv_aid_bitmap != NULL)
2288 				IEEE80211_AID_CLR(vap, ni->ni_associd);
2289 		}
2290 		ni->ni_wdsvap = NULL;		/* clear reference */
2291 		node_reclaim(nt, ni);
2292 	}
2293 	if (match != NULL && match->iv_opmode == IEEE80211_M_WDS) {
2294 		/*
2295 		 * Make a separate pass to clear references to this vap
2296 		 * held by DWDS entries.  They will not be matched above
2297 		 * because ni_vap will point to the ap vap but we still
2298 		 * need to clear ni_wdsvap when the WDS vap is destroyed
2299 		 * and/or reset.
2300 		 */
2301 		TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next)
2302 			if (ni->ni_wdsvap == match)
2303 				ni->ni_wdsvap = NULL;
2304 	}
2305 	IEEE80211_NODE_UNLOCK(nt);
2306 }
2307 
2308 static void
2309 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
2310 {
2311 	ieee80211_node_table_reset(nt, NULL);
2312 	if (nt->nt_keyixmap != NULL) {
2313 #ifdef DIAGNOSTIC
2314 		/* XXX verify all entries are NULL */
2315 		int i;
2316 		for (i = 0; i < nt->nt_keyixmax; i++)
2317 			if (nt->nt_keyixmap[i] != NULL)
2318 				printf("%s: %s[%u] still active\n", __func__,
2319 					nt->nt_name, i);
2320 #endif
2321 		IEEE80211_FREE(nt->nt_keyixmap, M_80211_NODE);
2322 		nt->nt_keyixmap = NULL;
2323 	}
2324 	IEEE80211_NODE_LOCK_DESTROY(nt);
2325 }
2326 
2327 static void
2328 timeout_stations(void *arg __unused, struct ieee80211_node *ni)
2329 {
2330 	struct ieee80211com *ic = ni->ni_ic;
2331 	struct ieee80211vap *vap = ni->ni_vap;
2332 
2333 	/*
2334 	 * Only process stations when in RUN state.  This
2335 	 * insures, for example, that we don't timeout an
2336 	 * inactive station during CAC.  Note that CSA state
2337 	 * is actually handled in ieee80211_node_timeout as
2338 	 * it applies to more than timeout processing.
2339 	 */
2340 	if (vap->iv_state != IEEE80211_S_RUN)
2341 		return;
2342 	/*
2343 	 * Ignore entries for which have yet to receive an
2344 	 * authentication frame.  These are transient and
2345 	 * will be reclaimed when the last reference to them
2346 	 * goes away (when frame xmits complete).
2347 	 */
2348 	if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
2349 	     vap->iv_opmode == IEEE80211_M_STA) &&
2350 	    (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
2351 		return;
2352 	/*
2353 	 * Free fragment if not needed anymore
2354 	 * (last fragment older than 1s).
2355 	 * XXX doesn't belong here, move to node_age
2356 	 */
2357 	if (ni->ni_rxfrag[0] != NULL &&
2358 	    ticks > ni->ni_rxfragstamp + hz) {
2359 		m_freem(ni->ni_rxfrag[0]);
2360 		ni->ni_rxfrag[0] = NULL;
2361 	}
2362 	if (ni->ni_inact > 0) {
2363 		ni->ni_inact--;
2364 		IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
2365 		    "%s: inact %u inact_reload %u nrates %u",
2366 		    __func__, ni->ni_inact, ni->ni_inact_reload,
2367 		    ni->ni_rates.rs_nrates);
2368 	}
2369 	/*
2370 	 * Special case ourself; we may be idle for extended periods
2371 	 * of time and regardless reclaiming our state is wrong.
2372 	 * XXX run ic_node_age
2373 	 */
2374 	/* XXX before inact decrement? */
2375 	if (ni == vap->iv_bss)
2376 		return;
2377 	if (ni->ni_associd != 0 ||
2378 	    (vap->iv_opmode == IEEE80211_M_IBSS ||
2379 	     vap->iv_opmode == IEEE80211_M_AHDEMO)) {
2380 		/*
2381 		 * Age/drain resources held by the station.
2382 		 */
2383 		ic->ic_node_age(ni);
2384 		/*
2385 		 * Probe the station before time it out.  We
2386 		 * send a null data frame which may not be
2387 		 * universally supported by drivers (need it
2388 		 * for ps-poll support so it should be...).
2389 		 *
2390 		 * XXX don't probe the station unless we've
2391 		 *     received a frame from them (and have
2392 		 *     some idea of the rates they are capable
2393 		 *     of); this will get fixed more properly
2394 		 *     soon with better handling of the rate set.
2395 		 */
2396 		if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
2397 		    (0 < ni->ni_inact &&
2398 		     ni->ni_inact <= vap->iv_inact_probe) &&
2399 		    ni->ni_rates.rs_nrates != 0) {
2400 			IEEE80211_NOTE(vap,
2401 			    IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
2402 			    ni, "%s",
2403 			    "probe station due to inactivity");
2404 			/*
2405 			 * Grab a reference so the node cannot
2406 			 * be reclaimed before we send the frame.
2407 			 * ieee80211_send_nulldata understands
2408 			 * we've done this and reclaims the
2409 			 * ref for us as needed.
2410 			 */
2411 			/* XXX fix this (not required anymore). */
2412 			ieee80211_ref_node(ni);
2413 			/* XXX useless */
2414 			ieee80211_send_nulldata(ni);
2415 			/* XXX stat? */
2416 			return;
2417 		}
2418 	}
2419 	if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
2420 	    ni->ni_inact <= 0) {
2421 		IEEE80211_NOTE(vap,
2422 		    IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
2423 		    "station timed out due to inactivity "
2424 		    "(refcnt %u)", ieee80211_node_refcnt(ni));
2425 		/*
2426 		 * Send a deauthenticate frame and drop the station.
2427 		 * This is somewhat complicated due to reference counts
2428 		 * and locking.  At this point a station will typically
2429 		 * have a reference count of 2.  ieee80211_node_leave
2430 		 * will do a "free" of the node which will drop the
2431 		 * reference count.  But in the meantime a reference
2432 		 * wil be held by the deauth frame.  The actual reclaim
2433 		 * of the node will happen either after the tx is
2434 		 * completed or by ieee80211_node_leave.
2435 		 */
2436 		if (ni->ni_associd != 0) {
2437 			IEEE80211_SEND_MGMT(ni,
2438 			    IEEE80211_FC0_SUBTYPE_DEAUTH,
2439 			    IEEE80211_REASON_AUTH_EXPIRE);
2440 		}
2441 		ieee80211_node_leave(ni);
2442 		vap->iv_stats.is_node_timeout++;
2443 	}
2444 }
2445 
2446 /*
2447  * Timeout inactive stations and do related housekeeping.
2448  */
2449 static void
2450 ieee80211_timeout_stations(struct ieee80211com *ic)
2451 {
2452 	struct ieee80211_node_table *nt = &ic->ic_sta;
2453 
2454 	ieee80211_iterate_nodes(nt, timeout_stations, NULL);
2455 }
2456 
2457 /*
2458  * Aggressively reclaim resources.  This should be used
2459  * only in a critical situation to reclaim mbuf resources.
2460  */
2461 void
2462 ieee80211_drain(struct ieee80211com *ic)
2463 {
2464 	struct ieee80211_node_table *nt = &ic->ic_sta;
2465 	struct ieee80211vap *vap;
2466 	struct ieee80211_node *ni;
2467 
2468 	IEEE80211_NODE_LOCK(nt);
2469 	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
2470 		/*
2471 		 * Ignore entries for which have yet to receive an
2472 		 * authentication frame.  These are transient and
2473 		 * will be reclaimed when the last reference to them
2474 		 * goes away (when frame xmits complete).
2475 		 */
2476 		vap = ni->ni_vap;
2477 		/*
2478 		 * Only process stations when in RUN state.  This
2479 		 * insures, for example, that we don't timeout an
2480 		 * inactive station during CAC.  Note that CSA state
2481 		 * is actually handled in ieee80211_node_timeout as
2482 		 * it applies to more than timeout processing.
2483 		 */
2484 		if (vap->iv_state != IEEE80211_S_RUN)
2485 			continue;
2486 		/* XXX can vap be NULL? */
2487 		if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
2488 		     vap->iv_opmode == IEEE80211_M_STA) &&
2489 		    (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
2490 			continue;
2491 		/*
2492 		 * Free fragments.
2493 		 * XXX doesn't belong here, move to node_drain
2494 		 */
2495 		if (ni->ni_rxfrag[0] != NULL) {
2496 			m_freem(ni->ni_rxfrag[0]);
2497 			ni->ni_rxfrag[0] = NULL;
2498 		}
2499 		/*
2500 		 * Drain resources held by the station.
2501 		 */
2502 		ic->ic_node_drain(ni);
2503 	}
2504 	IEEE80211_NODE_UNLOCK(nt);
2505 }
2506 
2507 /*
2508  * Per-ieee80211vap inactivity timer callback.
2509  */
2510 static void
2511 ieee80211_vap_timeout(struct ieee80211vap *vap)
2512 {
2513 
2514 	IEEE80211_LOCK_ASSERT(vap->iv_ic);
2515 
2516 	ieee80211_vap_erp_timeout(vap);
2517 	ieee80211_ht_timeout(vap);
2518 	ieee80211_vht_timeout(vap);
2519 }
2520 
2521 /*
2522  * Per-ieee80211com inactivity timer callback.
2523  */
2524 void
2525 ieee80211_node_timeout(void *arg)
2526 {
2527 	struct ieee80211com *ic = arg;
2528 	struct ieee80211vap *vap;
2529 
2530 	/*
2531 	 * Defer timeout processing if a channel switch is pending.
2532 	 * We typically need to be mute so not doing things that
2533 	 * might generate frames is good to handle in one place.
2534 	 * Suppressing the station timeout processing may extend the
2535 	 * lifetime of inactive stations (by not decrementing their
2536 	 * idle counters) but this should be ok unless the CSA is
2537 	 * active for an unusually long time.
2538 	 */
2539 	if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
2540 		ieee80211_scan_timeout(ic);
2541 		ieee80211_timeout_stations(ic);
2542 		ieee80211_ageq_age(&ic->ic_stageq, IEEE80211_INACT_WAIT);
2543 
2544 		IEEE80211_LOCK(ic);
2545 		TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
2546 			ieee80211_vap_timeout(vap);
2547 		IEEE80211_UNLOCK(ic);
2548 	}
2549 	callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
2550 		ieee80211_node_timeout, ic);
2551 }
2552 
2553 /*
2554  * The same as ieee80211_iterate_nodes(), but for one vap only.
2555  */
2556 int
2557 ieee80211_iterate_nodes_vap(struct ieee80211_node_table *nt,
2558     struct ieee80211vap *vap, ieee80211_iter_func *f, void *arg)
2559 {
2560 	struct ieee80211_node **ni_arr;
2561 	struct ieee80211_node *ni;
2562 	size_t size;
2563 	int count, i;
2564 
2565 	/*
2566 	 * Iterate over the node table and save an array of ref'ed nodes.
2567 	 *
2568 	 * This is separated out from calling the actual node function so that
2569 	 * no LORs will occur.
2570 	 */
2571 	IEEE80211_NODE_LOCK(nt);
2572 	count = nt->nt_count;
2573 	size = count * sizeof(struct ieee80211_node *);
2574 	ni_arr = (struct ieee80211_node **) IEEE80211_MALLOC(size, M_80211_NODE,
2575 	    IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
2576 	if (ni_arr == NULL) {
2577 		IEEE80211_NODE_UNLOCK(nt);
2578 		return (ENOMEM);
2579 	}
2580 
2581 	i = 0;
2582 	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
2583 		if (vap != NULL && ni->ni_vap != vap)
2584 			continue;
2585 		KASSERT(i < count,
2586 		    ("node array overflow (vap %p, i %d, count %d)\n",
2587 		    vap, i, count));
2588 		ni_arr[i] = ieee80211_ref_node(ni);
2589 		i++;
2590 	}
2591 	IEEE80211_NODE_UNLOCK(nt);
2592 
2593 	for (i = 0; i < count; i++) {
2594 		if (ni_arr[i] == NULL)	/* end of the list */
2595 			break;
2596 		(*f)(arg, ni_arr[i]);
2597 		/* ieee80211_free_node() locks by itself */
2598 		ieee80211_free_node(ni_arr[i]);
2599 	}
2600 
2601 	IEEE80211_FREE(ni_arr, M_80211_NODE);
2602 
2603 	return (0);
2604 }
2605 
2606 /*
2607  * Just a wrapper, so we don't have to change every ieee80211_iterate_nodes()
2608  * reference in the source.
2609  */
2610 void
2611 ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
2612 	ieee80211_iter_func *f, void *arg)
2613 {
2614 	/* XXX no way to pass error to the caller. */
2615 	(void) ieee80211_iterate_nodes_vap(nt, NULL, f, arg);
2616 }
2617 
2618 void
2619 ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
2620 {
2621 	printf("0x%p: mac %s refcnt %d\n", ni,
2622 		ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
2623 	printf("\tauthmode %u flags 0x%x\n",
2624 		ni->ni_authmode, ni->ni_flags);
2625 	printf("\tassocid 0x%x txpower %u vlan %u\n",
2626 		ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
2627 	printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
2628 		ni->ni_txseqs[IEEE80211_NONQOS_TID],
2629 		ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
2630 		ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
2631 		ni->ni_rxfragstamp);
2632 	printf("\trssi %d noise %d intval %u capinfo 0x%x\n",
2633 		node_getrssi(ni), ni->ni_noise,
2634 		ni->ni_intval, ni->ni_capinfo);
2635 	printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
2636 		ether_sprintf(ni->ni_bssid),
2637 		ni->ni_esslen, ni->ni_essid,
2638 		ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
2639 	printf("\tinact %u inact_reload %u txrate %u\n",
2640 		ni->ni_inact, ni->ni_inact_reload, ni->ni_txrate);
2641 	printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
2642 		ni->ni_htcap, ni->ni_htparam,
2643 		ni->ni_htctlchan, ni->ni_ht2ndchan);
2644 	printf("\thtopmode %x htstbc %x htchw %u\n",
2645 		ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
2646 	printf("\tvhtcap %x freq1 %d freq2 %d vhtbasicmcs %x\n",
2647 		ni->ni_vhtcap, (int) ni->ni_vht_chan1, (int) ni->ni_vht_chan2,
2648 		(int) ni->ni_vht_basicmcs);
2649 	/* XXX VHT state */
2650 }
2651 
2652 void
2653 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
2654 {
2655 	ieee80211_iterate_nodes(nt,
2656 		(ieee80211_iter_func *) ieee80211_dump_node, nt);
2657 }
2658 
2659 /*
2660  * Iterate over the VAPs and update their ERP beacon IEs.
2661  *
2662  * Note this must be called from the deferred ERP update task paths.
2663  */
2664 void
2665 ieee80211_notify_erp_locked(struct ieee80211com *ic)
2666 {
2667 	struct ieee80211vap *vap;
2668 
2669 	IEEE80211_LOCK_ASSERT(ic);
2670 
2671 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
2672 		if (vap->iv_opmode == IEEE80211_M_HOSTAP)
2673 			ieee80211_beacon_notify(vap, IEEE80211_BEACON_ERP);
2674 }
2675 
2676 /*
2677  * Handle a station joining an 11g network.
2678  */
2679 static void
2680 ieee80211_node_join_11g(struct ieee80211_node *ni)
2681 {
2682 	struct ieee80211com *ic = ni->ni_ic;
2683 	struct ieee80211vap *vap = ni->ni_vap;
2684 
2685 	IEEE80211_LOCK_ASSERT(ic);
2686 
2687 	/*
2688 	 * Station isn't capable of short slot time.  Bump
2689 	 * the count of long slot time stations and disable
2690 	 * use of short slot time.  Note that the actual switch
2691 	 * over to long slot time use may not occur until the
2692 	 * next beacon transmission (per sec. 7.3.1.4 of 11g).
2693 	 */
2694 	if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
2695 		vap->iv_longslotsta++;
2696 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2697 		    "station needs long slot time, count %d",
2698 		    vap->iv_longslotsta);
2699 		/*
2700 		 * XXX TODO: this may need all VAPs checked!
2701 		 */
2702 		if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
2703 			/*
2704 			 * Don't force slot time when switched to turbo
2705 			 * mode as non-ERP stations won't be present; this
2706 			 * need only be done when on the normal G channel.
2707 			 */
2708 			ieee80211_vap_set_shortslottime(vap, 0);
2709 		}
2710 	}
2711 	/*
2712 	 * If the new station is not an ERP station
2713 	 * then bump the counter and enable protection
2714 	 * if configured.
2715 	 */
2716 	if (!ieee80211_iserp_rateset(&ni->ni_rates)) {
2717 		vap->iv_nonerpsta++;
2718 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2719 		    "station is !ERP, %d non-ERP stations associated",
2720 		    vap->iv_nonerpsta);
2721 		/*
2722 		 * If station does not support short preamble
2723 		 * then we must enable use of Barker preamble.
2724 		 */
2725 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
2726 			IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2727 			    "%s", "station needs long preamble");
2728 			vap->iv_flags |= IEEE80211_F_USEBARKER;
2729 			vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE;
2730 			ieee80211_vap_update_preamble(vap);
2731 		}
2732 		/*
2733 		 * If protection is configured and this is the first
2734 		 * indication we should use protection, enable it.
2735 		 */
2736 		if (vap->iv_protmode != IEEE80211_PROT_NONE &&
2737 		    vap->iv_nonerpsta == 1 &&
2738 		    (vap->iv_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
2739 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
2740 			    "%s: enable use of protection\n", __func__);
2741 			vap->iv_flags |= IEEE80211_F_USEPROT;
2742 			ieee80211_vap_update_erp_protmode(vap);
2743 		}
2744 	} else
2745 		ni->ni_flags |= IEEE80211_NODE_ERP;
2746 }
2747 
2748 void
2749 ieee80211_node_join(struct ieee80211_node *ni, int resp)
2750 {
2751 	struct ieee80211com *ic = ni->ni_ic;
2752 	struct ieee80211vap *vap = ni->ni_vap;
2753 	int newassoc;
2754 
2755 	if (ni->ni_associd == 0) {
2756 		uint16_t aid;
2757 
2758 		KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
2759 		/*
2760 		 * It would be good to search the bitmap
2761 		 * more efficiently, but this will do for now.
2762 		 */
2763 		for (aid = 1; aid < vap->iv_max_aid; aid++) {
2764 			if (!IEEE80211_AID_ISSET(vap, aid))
2765 				break;
2766 		}
2767 		if (aid >= vap->iv_max_aid) {
2768 			IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_TOOMANY);
2769 			ieee80211_node_leave(ni);
2770 			return;
2771 		}
2772 		ni->ni_associd = aid | 0xc000;
2773 		ni->ni_jointime = time_uptime;
2774 		IEEE80211_LOCK(ic);
2775 		IEEE80211_AID_SET(vap, ni->ni_associd);
2776 		vap->iv_sta_assoc++;
2777 
2778 		if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
2779 			ieee80211_ht_node_join(ni);
2780 		if (IEEE80211_IS_CHAN_VHT(ic->ic_bsschan))
2781 			ieee80211_vht_node_join(ni);
2782 		if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2783 		    IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
2784 			ieee80211_node_join_11g(ni);
2785 		IEEE80211_UNLOCK(ic);
2786 
2787 		newassoc = 1;
2788 	} else
2789 		newassoc = 0;
2790 
2791 	/*
2792 	 * XXX VHT - should log VHT channel width, etc
2793 	 */
2794 	IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
2795 	    "station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s",
2796 	    IEEE80211_NODE_AID(ni),
2797 	    vap->iv_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
2798 	    vap->iv_flags & IEEE80211_F_SHSLOT ? "short" : "long",
2799 	    vap->iv_flags & IEEE80211_F_USEPROT ? ", protection" : "",
2800 	    ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
2801 	    /* XXX update for VHT string */
2802 	    ni->ni_flags & IEEE80211_NODE_HT ?
2803 		(ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
2804 	    ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
2805 	    ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "",
2806 	    ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
2807 	        ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
2808 	    ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
2809 	    IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
2810 		", fast-frames" : "",
2811 	    IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
2812 		", turbo" : ""
2813 	);
2814 
2815 	ieee80211_node_setuptxparms(ni);
2816 	ieee80211_ratectl_node_init(ni);
2817 	/* give driver a chance to setup state like ni_txrate */
2818 	if (ic->ic_newassoc != NULL)
2819 		ic->ic_newassoc(ni, newassoc);
2820 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
2821 	/* tell the authenticator about new station */
2822 	if (vap->iv_auth->ia_node_join != NULL)
2823 		vap->iv_auth->ia_node_join(ni);
2824 	ieee80211_notify_node_join(ni,
2825 	    resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
2826 }
2827 
2828 static void
2829 disable_protection(struct ieee80211vap *vap)
2830 {
2831 	struct ieee80211com *ic = vap->iv_ic;
2832 
2833 	KASSERT(vap->iv_nonerpsta == 0 &&
2834 	    (vap->iv_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
2835 	   ("%d non ERP stations, flags 0x%x", vap->iv_nonerpsta,
2836 	   vap->iv_flags_ext));
2837 
2838 	vap->iv_flags &= ~IEEE80211_F_USEPROT;
2839 	/* XXX verify mode? */
2840 	if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
2841 		vap->iv_flags |= IEEE80211_F_SHPREAMBLE;
2842 		vap->iv_flags &= ~IEEE80211_F_USEBARKER;
2843 	}
2844 	ieee80211_vap_update_erp_protmode(vap);
2845 	ieee80211_vap_update_preamble(vap);
2846 }
2847 
2848 /*
2849  * Handle a station leaving an 11g network.
2850  */
2851 static void
2852 ieee80211_node_leave_11g(struct ieee80211_node *ni)
2853 {
2854 	struct ieee80211com *ic = ni->ni_ic;
2855 	struct ieee80211vap *vap = ni->ni_vap;
2856 
2857 	IEEE80211_LOCK_ASSERT(ic);
2858 
2859 	KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
2860 	     ("not in 11g, bss %u:0x%x", ic->ic_bsschan->ic_freq,
2861 	      ic->ic_bsschan->ic_flags));
2862 
2863 	/*
2864 	 * If a long slot station do the slot time bookkeeping.
2865 	 */
2866 	if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
2867 		KASSERT(vap->iv_longslotsta > 0,
2868 		    ("bogus long slot station count %d", vap->iv_longslotsta));
2869 		vap->iv_longslotsta--;
2870 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2871 		    "long slot time station leaves, count now %d",
2872 		    vap->iv_longslotsta);
2873 		/*
2874 		 * XXX TODO: this may need all VAPs checked!
2875 		 */
2876 		if (vap->iv_longslotsta == 0) {
2877 			/*
2878 			 * Re-enable use of short slot time if supported
2879 			 * and not operating in IBSS mode (per spec).
2880 			 */
2881 			if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
2882 			    ic->ic_opmode != IEEE80211_M_IBSS) {
2883 				IEEE80211_DPRINTF(ni->ni_vap,
2884 				    IEEE80211_MSG_ASSOC,
2885 				    "%s: re-enable use of short slot time\n",
2886 				    __func__);
2887 				ieee80211_vap_set_shortslottime(vap, 1);
2888 			}
2889 		}
2890 	}
2891 	/*
2892 	 * If a non-ERP station do the protection-related bookkeeping.
2893 	 */
2894 	if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
2895 		KASSERT(vap->iv_nonerpsta > 0,
2896 		    ("bogus non-ERP station count %d", vap->iv_nonerpsta));
2897 		vap->iv_nonerpsta--;
2898 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2899 		    "non-ERP station leaves, count now %d%s", vap->iv_nonerpsta,
2900 		    (vap->iv_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
2901 			" (non-ERP sta present)" : "");
2902 		if (vap->iv_nonerpsta == 0 &&
2903 		    (vap->iv_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
2904 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
2905 				"%s: disable use of protection\n", __func__);
2906 			disable_protection(vap);
2907 		}
2908 	}
2909 }
2910 
2911 /*
2912  * Time out presence of an overlapping bss with non-ERP
2913  * stations.  When operating in hostap mode we listen for
2914  * beacons from other stations and if we identify a non-ERP
2915  * station is present we enable protection.  To identify
2916  * when all non-ERP stations are gone we time out this
2917  * condition.
2918  */
2919 static void
2920 ieee80211_vap_erp_timeout(struct ieee80211vap *vap)
2921 {
2922 
2923 	IEEE80211_LOCK_ASSERT(vap->iv_ic);
2924 
2925 	if ((vap->iv_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
2926 	    ieee80211_time_after(ticks, vap->iv_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
2927 		IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
2928 		    "%s", "age out non-ERP sta present on channel");
2929 		vap->iv_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
2930 		if (vap->iv_nonerpsta == 0)
2931 			disable_protection(vap);
2932 	}
2933 }
2934 
2935 /*
2936  * Handle bookkeeping for station deauthentication/disassociation
2937  * when operating as an ap.
2938  */
2939 void
2940 ieee80211_node_leave(struct ieee80211_node *ni)
2941 {
2942 	struct ieee80211com *ic = ni->ni_ic;
2943 	struct ieee80211vap *vap = ni->ni_vap;
2944 	struct ieee80211_node_table *nt = ni->ni_table;
2945 
2946 	IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
2947 	    "station with aid %d leaves", IEEE80211_NODE_AID(ni));
2948 
2949 	KASSERT(vap->iv_opmode != IEEE80211_M_STA,
2950 		("unexpected operating mode %u", vap->iv_opmode));
2951 	/*
2952 	 * If node wasn't previously associated all
2953 	 * we need to do is reclaim the reference.
2954 	 */
2955 	/* XXX ibss mode bypasses 11g and notification */
2956 	if (ni->ni_associd == 0)
2957 		goto done;
2958 	/*
2959 	 * Tell the authenticator the station is leaving.
2960 	 * Note that we must do this before yanking the
2961 	 * association id as the authenticator uses the
2962 	 * associd to locate it's state block.
2963 	 */
2964 	if (vap->iv_auth->ia_node_leave != NULL)
2965 		vap->iv_auth->ia_node_leave(ni);
2966 
2967 	IEEE80211_LOCK(ic);
2968 	IEEE80211_AID_CLR(vap, ni->ni_associd);
2969 	vap->iv_sta_assoc--;
2970 
2971 	if (IEEE80211_IS_CHAN_VHT(ic->ic_bsschan))
2972 		ieee80211_vht_node_leave(ni);
2973 	if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
2974 		ieee80211_ht_node_leave(ni);
2975 	if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2976 	    IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
2977 		ieee80211_node_leave_11g(ni);
2978 	IEEE80211_UNLOCK(ic);
2979 	/*
2980 	 * Cleanup station state.  In particular clear various
2981 	 * state that might otherwise be reused if the node
2982 	 * is reused before the reference count goes to zero
2983 	 * (and memory is reclaimed).
2984 	 */
2985 	ieee80211_sta_leave(ni);
2986 done:
2987 	/*
2988 	 * Remove the node from any table it's recorded in and
2989 	 * drop the caller's reference.  Removal from the table
2990 	 * is important to insure the node is not reprocessed
2991 	 * for inactivity.
2992 	 */
2993 	if (nt != NULL) {
2994 		IEEE80211_NODE_LOCK(nt);
2995 		node_reclaim(nt, ni);
2996 		IEEE80211_NODE_UNLOCK(nt);
2997 	} else
2998 		ieee80211_free_node(ni);
2999 }
3000 
3001 struct rssiinfo {
3002 	int	rssi_samples;
3003 	uint32_t rssi_total;
3004 };
3005 
3006 static void
3007 get_hostap_rssi(void *arg, struct ieee80211_node *ni)
3008 {
3009 	struct rssiinfo *info = arg;
3010 	struct ieee80211vap *vap = ni->ni_vap;
3011 	int8_t rssi;
3012 
3013 	/* only associated stations */
3014 	if (ni->ni_associd == 0)
3015 		return;
3016 	rssi = vap->iv_ic->ic_node_getrssi(ni);
3017 	if (rssi != 0) {
3018 		info->rssi_samples++;
3019 		info->rssi_total += rssi;
3020 	}
3021 }
3022 
3023 static void
3024 get_adhoc_rssi(void *arg, struct ieee80211_node *ni)
3025 {
3026 	struct rssiinfo *info = arg;
3027 	struct ieee80211vap *vap = ni->ni_vap;
3028 	int8_t rssi;
3029 
3030 	/* only neighbors */
3031 	/* XXX check bssid */
3032 	if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
3033 		return;
3034 	rssi = vap->iv_ic->ic_node_getrssi(ni);
3035 	if (rssi != 0) {
3036 		info->rssi_samples++;
3037 		info->rssi_total += rssi;
3038 	}
3039 }
3040 
3041 #ifdef IEEE80211_SUPPORT_MESH
3042 static void
3043 get_mesh_rssi(void *arg, struct ieee80211_node *ni)
3044 {
3045 	struct rssiinfo *info = arg;
3046 	struct ieee80211vap *vap = ni->ni_vap;
3047 	int8_t rssi;
3048 
3049 	/* only neighbors that peered successfully */
3050 	if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
3051 		return;
3052 	rssi = vap->iv_ic->ic_node_getrssi(ni);
3053 	if (rssi != 0) {
3054 		info->rssi_samples++;
3055 		info->rssi_total += rssi;
3056 	}
3057 }
3058 #endif /* IEEE80211_SUPPORT_MESH */
3059 
3060 int8_t
3061 ieee80211_getrssi(struct ieee80211vap *vap)
3062 {
3063 #define	NZ(x)	((x) == 0 ? 1 : (x))
3064 	struct ieee80211com *ic = vap->iv_ic;
3065 	struct rssiinfo info;
3066 
3067 	info.rssi_total = 0;
3068 	info.rssi_samples = 0;
3069 	switch (vap->iv_opmode) {
3070 	case IEEE80211_M_IBSS:		/* average of all ibss neighbors */
3071 	case IEEE80211_M_AHDEMO:	/* average of all neighbors */
3072 		ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, get_adhoc_rssi,
3073 		    &info);
3074 		break;
3075 	case IEEE80211_M_HOSTAP:	/* average of all associated stations */
3076 		ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, get_hostap_rssi,
3077 		    &info);
3078 		break;
3079 #ifdef IEEE80211_SUPPORT_MESH
3080 	case IEEE80211_M_MBSS:		/* average of all mesh neighbors */
3081 		ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, get_mesh_rssi,
3082 		    &info);
3083 		break;
3084 #endif
3085 	case IEEE80211_M_MONITOR:	/* XXX */
3086 	case IEEE80211_M_STA:		/* use stats from associated ap */
3087 	default:
3088 		if (vap->iv_bss != NULL)
3089 			info.rssi_total = ic->ic_node_getrssi(vap->iv_bss);
3090 		info.rssi_samples = 1;
3091 		break;
3092 	}
3093 	return info.rssi_total / NZ(info.rssi_samples);
3094 #undef NZ
3095 }
3096 
3097 void
3098 ieee80211_getsignal(struct ieee80211vap *vap, int8_t *rssi, int8_t *noise)
3099 {
3100 
3101 	if (vap->iv_bss == NULL)		/* NB: shouldn't happen */
3102 		return;
3103 	vap->iv_ic->ic_node_getsignal(vap->iv_bss, rssi, noise);
3104 	/* for non-station mode return avg'd rssi accounting */
3105 	if (vap->iv_opmode != IEEE80211_M_STA)
3106 		*rssi = ieee80211_getrssi(vap);
3107 }
3108