xref: /haiku/src/libs/compat/freebsd_wlan/net80211/ieee80211_node.c (revision 6e434fd80e4640c64031faf5e49720c5672fc470)
1 /*-
2  * Copyright (c) 2001 Atsushi Onoe
3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include "opt_wlan.h"
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/mbuf.h>
35 #include <sys/malloc.h>
36 #include <sys/kernel.h>
37 
38 #include <sys/socket.h>
39 
40 #include <net/if.h>
41 #include <net/if_media.h>
42 #include <net/ethernet.h>
43 
44 #include <net80211/ieee80211_var.h>
45 #include <net80211/ieee80211_input.h>
46 #ifdef IEEE80211_SUPPORT_SUPERG
47 #include <net80211/ieee80211_superg.h>
48 #endif
49 #ifdef IEEE80211_SUPPORT_TDMA
50 #include <net80211/ieee80211_tdma.h>
51 #endif
52 #include <net80211/ieee80211_wds.h>
53 #include <net80211/ieee80211_mesh.h>
54 #include <net80211/ieee80211_ratectl.h>
55 
56 #include <net/bpf.h>
57 
58 /*
59  * IEEE80211_NODE_HASHSIZE must be a power of 2.
60  */
61 CTASSERT((IEEE80211_NODE_HASHSIZE & (IEEE80211_NODE_HASHSIZE-1)) == 0);
62 
63 /*
64  * Association id's are managed with a bit vector.
65  */
66 #define	IEEE80211_AID_SET(_vap, b) \
67 	((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] |= \
68 		(1 << (IEEE80211_AID(b) % 32)))
69 #define	IEEE80211_AID_CLR(_vap, b) \
70 	((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] &= \
71 		~(1 << (IEEE80211_AID(b) % 32)))
72 #define	IEEE80211_AID_ISSET(_vap, b) \
73 	((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))
74 
75 #ifdef IEEE80211_DEBUG_REFCNT
76 #define REFCNT_LOC "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line
77 #else
78 #define REFCNT_LOC "%s %p<%s> refcnt %d\n", __func__
79 #endif
80 
81 static int ieee80211_sta_join1(struct ieee80211_node *);
82 
83 static struct ieee80211_node *node_alloc(struct ieee80211vap *,
84 	const uint8_t [IEEE80211_ADDR_LEN]);
85 static void node_cleanup(struct ieee80211_node *);
86 static void node_free(struct ieee80211_node *);
87 static void node_age(struct ieee80211_node *);
88 static int8_t node_getrssi(const struct ieee80211_node *);
89 static void node_getsignal(const struct ieee80211_node *, int8_t *, int8_t *);
90 static void node_getmimoinfo(const struct ieee80211_node *,
91 	struct ieee80211_mimo_info *);
92 
93 static void _ieee80211_free_node(struct ieee80211_node *);
94 
95 static void ieee80211_node_table_init(struct ieee80211com *ic,
96 	struct ieee80211_node_table *nt, const char *name,
97 	int inact, int keymaxix);
98 static void ieee80211_node_table_reset(struct ieee80211_node_table *,
99 	struct ieee80211vap *);
100 static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
101 static void ieee80211_erp_timeout(struct ieee80211com *);
102 
103 void
104 ieee80211_node_attach(struct ieee80211com *ic)
105 {
106 	/* XXX really want maxlen enforced per-sta */
107 	ieee80211_ageq_init(&ic->ic_stageq, ic->ic_max_keyix * 8,
108 	    "802.11 staging q");
109 	ieee80211_node_table_init(ic, &ic->ic_sta, "station",
110 		IEEE80211_INACT_INIT, ic->ic_max_keyix);
111 	callout_init(&ic->ic_inact, CALLOUT_MPSAFE);
112 	callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
113 		ieee80211_node_timeout, ic);
114 
115 	ic->ic_node_alloc = node_alloc;
116 	ic->ic_node_free = node_free;
117 	ic->ic_node_cleanup = node_cleanup;
118 	ic->ic_node_age = node_age;
119 	ic->ic_node_drain = node_age;		/* NB: same as age */
120 	ic->ic_node_getrssi = node_getrssi;
121 	ic->ic_node_getsignal = node_getsignal;
122 	ic->ic_node_getmimoinfo = node_getmimoinfo;
123 
124 	/*
125 	 * Set flags to be propagated to all vap's;
126 	 * these define default behaviour/configuration.
127 	 */
128 	ic->ic_flags_ext |= IEEE80211_FEXT_INACT; /* inactivity processing */
129 }
130 
131 void
132 ieee80211_node_detach(struct ieee80211com *ic)
133 {
134 
135 	callout_drain(&ic->ic_inact);
136 	ieee80211_node_table_cleanup(&ic->ic_sta);
137 	ieee80211_ageq_cleanup(&ic->ic_stageq);
138 }
139 
140 void
141 ieee80211_node_vattach(struct ieee80211vap *vap)
142 {
143 	/* NB: driver can override */
144 	vap->iv_max_aid = IEEE80211_AID_DEF;
145 
146 	/* default station inactivity timer setings */
147 	vap->iv_inact_init = IEEE80211_INACT_INIT;
148 	vap->iv_inact_auth = IEEE80211_INACT_AUTH;
149 	vap->iv_inact_run = IEEE80211_INACT_RUN;
150 	vap->iv_inact_probe = IEEE80211_INACT_PROBE;
151 
152 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_INACT,
153 	    "%s: init %u auth %u run %u probe %u\n", __func__,
154 	    vap->iv_inact_init, vap->iv_inact_auth,
155 	    vap->iv_inact_run, vap->iv_inact_probe);
156 }
157 
158 void
159 ieee80211_node_latevattach(struct ieee80211vap *vap)
160 {
161 	if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
162 		/* XXX should we allow max aid to be zero? */
163 		if (vap->iv_max_aid < IEEE80211_AID_MIN) {
164 			vap->iv_max_aid = IEEE80211_AID_MIN;
165 			if_printf(vap->iv_ifp,
166 			    "WARNING: max aid too small, changed to %d\n",
167 			    vap->iv_max_aid);
168 		}
169 		vap->iv_aid_bitmap = (uint32_t *) malloc(
170 			howmany(vap->iv_max_aid, 32) * sizeof(uint32_t),
171 			M_80211_NODE, M_NOWAIT | M_ZERO);
172 		if (vap->iv_aid_bitmap == NULL) {
173 			/* XXX no way to recover */
174 			printf("%s: no memory for AID bitmap, max aid %d!\n",
175 			    __func__, vap->iv_max_aid);
176 			vap->iv_max_aid = 0;
177 		}
178 	}
179 
180 	ieee80211_reset_bss(vap);
181 
182 	vap->iv_auth = ieee80211_authenticator_get(vap->iv_bss->ni_authmode);
183 }
184 
185 void
186 ieee80211_node_vdetach(struct ieee80211vap *vap)
187 {
188 	struct ieee80211com *ic = vap->iv_ic;
189 
190 	ieee80211_node_table_reset(&ic->ic_sta, vap);
191 	if (vap->iv_bss != NULL) {
192 		ieee80211_free_node(vap->iv_bss);
193 		vap->iv_bss = NULL;
194 	}
195 	if (vap->iv_aid_bitmap != NULL) {
196 		free(vap->iv_aid_bitmap, M_80211_NODE);
197 		vap->iv_aid_bitmap = NULL;
198 	}
199 }
200 
201 /*
202  * Port authorize/unauthorize interfaces for use by an authenticator.
203  */
204 
205 void
206 ieee80211_node_authorize(struct ieee80211_node *ni)
207 {
208 	struct ieee80211vap *vap = ni->ni_vap;
209 
210 	ni->ni_flags |= IEEE80211_NODE_AUTH;
211 	ni->ni_inact_reload = vap->iv_inact_run;
212 	ni->ni_inact = ni->ni_inact_reload;
213 
214 	IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
215 	    "%s: inact_reload %u", __func__, ni->ni_inact_reload);
216 }
217 
218 void
219 ieee80211_node_unauthorize(struct ieee80211_node *ni)
220 {
221 	struct ieee80211vap *vap = ni->ni_vap;
222 
223 	ni->ni_flags &= ~IEEE80211_NODE_AUTH;
224 	ni->ni_inact_reload = vap->iv_inact_auth;
225 	if (ni->ni_inact > ni->ni_inact_reload)
226 		ni->ni_inact = ni->ni_inact_reload;
227 
228 	IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
229 	    "%s: inact_reload %u inact %u", __func__,
230 	    ni->ni_inact_reload, ni->ni_inact);
231 }
232 
233 /*
234  * Fix tx parameters for a node according to ``association state''.
235  */
236 void
237 ieee80211_node_setuptxparms(struct ieee80211_node *ni)
238 {
239 	struct ieee80211vap *vap = ni->ni_vap;
240 	enum ieee80211_phymode mode;
241 
242 	if (ni->ni_flags & IEEE80211_NODE_HT) {
243 		if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
244 			mode = IEEE80211_MODE_11NA;
245 		else
246 			mode = IEEE80211_MODE_11NG;
247 	} else {				/* legacy rate handling */
248 		if (IEEE80211_IS_CHAN_ST(ni->ni_chan))
249 			mode = IEEE80211_MODE_STURBO_A;
250 		else if (IEEE80211_IS_CHAN_HALF(ni->ni_chan))
251 			mode = IEEE80211_MODE_HALF;
252 		else if (IEEE80211_IS_CHAN_QUARTER(ni->ni_chan))
253 			mode = IEEE80211_MODE_QUARTER;
254 		/* NB: 108A should be handled as 11a */
255 		else if (IEEE80211_IS_CHAN_A(ni->ni_chan))
256 			mode = IEEE80211_MODE_11A;
257 		else if (IEEE80211_IS_CHAN_108G(ni->ni_chan) ||
258 		    (ni->ni_flags & IEEE80211_NODE_ERP))
259 			mode = IEEE80211_MODE_11G;
260 		else
261 			mode = IEEE80211_MODE_11B;
262 	}
263 	ni->ni_txparms = &vap->iv_txparms[mode];
264 }
265 
266 /*
267  * Set/change the channel.  The rate set is also updated as
268  * to insure a consistent view by drivers.
269  * XXX should be private but hostap needs it to deal with CSA
270  */
271 void
272 ieee80211_node_set_chan(struct ieee80211_node *ni,
273 	struct ieee80211_channel *chan)
274 {
275 	struct ieee80211com *ic = ni->ni_ic;
276 	struct ieee80211vap *vap = ni->ni_vap;
277 	enum ieee80211_phymode mode;
278 
279 	KASSERT(chan != IEEE80211_CHAN_ANYC, ("no channel"));
280 
281 	ni->ni_chan = chan;
282 	mode = ieee80211_chan2mode(chan);
283 	if (IEEE80211_IS_CHAN_HT(chan)) {
284 		/*
285 		 * We must install the legacy rate est in ni_rates and the
286 		 * HT rate set in ni_htrates.
287 		 */
288 		ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan);
289 		/*
290 		 * Setup bss tx parameters based on operating mode.  We
291 		 * use legacy rates when operating in a mixed HT+non-HT bss
292 		 * and non-ERP rates in 11g for mixed ERP+non-ERP bss.
293 		 */
294 		if (mode == IEEE80211_MODE_11NA &&
295 		    (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
296 			mode = IEEE80211_MODE_11A;
297 		else if (mode == IEEE80211_MODE_11NG &&
298 		    (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
299 			mode = IEEE80211_MODE_11G;
300 		if (mode == IEEE80211_MODE_11G &&
301 		    (vap->iv_flags & IEEE80211_F_PUREG) == 0)
302 			mode = IEEE80211_MODE_11B;
303 	}
304 	ni->ni_txparms = &vap->iv_txparms[mode];
305 	ni->ni_rates = *ieee80211_get_suprates(ic, chan);
306 }
307 
308 static __inline void
309 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
310 {
311 	/* propagate useful state */
312 	nbss->ni_authmode = obss->ni_authmode;
313 	nbss->ni_txpower = obss->ni_txpower;
314 	nbss->ni_vlan = obss->ni_vlan;
315 	/* XXX statistics? */
316 	/* XXX legacy WDS bssid? */
317 }
318 
319 void
320 ieee80211_create_ibss(struct ieee80211vap* vap, struct ieee80211_channel *chan)
321 {
322 	struct ieee80211com *ic = vap->iv_ic;
323 	struct ieee80211_node *ni;
324 
325 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
326 		"%s: creating %s on channel %u\n", __func__,
327 		ieee80211_opmode_name[vap->iv_opmode],
328 		ieee80211_chan2ieee(ic, chan));
329 
330 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
331 	if (ni == NULL) {
332 		/* XXX recovery? */
333 		return;
334 	}
335 	IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
336 	ni->ni_esslen = vap->iv_des_ssid[0].len;
337 	memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
338 	if (vap->iv_bss != NULL)
339 		copy_bss(ni, vap->iv_bss);
340 	ni->ni_intval = ic->ic_bintval;
341 	if (vap->iv_flags & IEEE80211_F_PRIVACY)
342 		ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
343 	if (ic->ic_phytype == IEEE80211_T_FH) {
344 		ni->ni_fhdwell = 200;	/* XXX */
345 		ni->ni_fhindex = 1;
346 	}
347 	if (vap->iv_opmode == IEEE80211_M_IBSS) {
348 		vap->iv_flags |= IEEE80211_F_SIBSS;
349 		ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS;	/* XXX */
350 		if (vap->iv_flags & IEEE80211_F_DESBSSID)
351 			IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
352 		else {
353 			get_random_bytes(ni->ni_bssid, IEEE80211_ADDR_LEN);
354 			/* clear group bit, add local bit */
355 			ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02;
356 		}
357 	} else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
358 		if (vap->iv_flags & IEEE80211_F_DESBSSID)
359 			IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
360 		else
361 #ifdef IEEE80211_SUPPORT_TDMA
362 		if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
363 #endif
364 			memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
365 #ifdef IEEE80211_SUPPORT_MESH
366 	} else if (vap->iv_opmode == IEEE80211_M_MBSS) {
367 		ni->ni_meshidlen = vap->iv_mesh->ms_idlen;
368 		memcpy(ni->ni_meshid, vap->iv_mesh->ms_id, ni->ni_meshidlen);
369 #endif
370 	}
371 	/*
372 	 * Fix the channel and related attributes.
373 	 */
374 	/* clear DFS CAC state on previous channel */
375 	if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
376 	    ic->ic_bsschan->ic_freq != chan->ic_freq &&
377 	    IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan))
378 		ieee80211_dfs_cac_clear(ic, ic->ic_bsschan);
379 	ic->ic_bsschan = chan;
380 	ieee80211_node_set_chan(ni, chan);
381 	ic->ic_curmode = ieee80211_chan2mode(chan);
382 	/*
383 	 * Do mode-specific setup.
384 	 */
385 	if (IEEE80211_IS_CHAN_FULL(chan)) {
386 		if (IEEE80211_IS_CHAN_ANYG(chan)) {
387 			/*
388 			 * Use a mixed 11b/11g basic rate set.
389 			 */
390 			ieee80211_setbasicrates(&ni->ni_rates,
391 			    IEEE80211_MODE_11G);
392 			if (vap->iv_flags & IEEE80211_F_PUREG) {
393 				/*
394 				 * Also mark OFDM rates basic so 11b
395 				 * stations do not join (WiFi compliance).
396 				 */
397 				ieee80211_addbasicrates(&ni->ni_rates,
398 				    IEEE80211_MODE_11A);
399 			}
400 		} else if (IEEE80211_IS_CHAN_B(chan)) {
401 			/*
402 			 * Force pure 11b rate set.
403 			 */
404 			ieee80211_setbasicrates(&ni->ni_rates,
405 				IEEE80211_MODE_11B);
406 		}
407 	}
408 
409 	(void) ieee80211_sta_join1(ieee80211_ref_node(ni));
410 }
411 
412 /*
413  * Reset bss state on transition to the INIT state.
414  * Clear any stations from the table (they have been
415  * deauth'd) and reset the bss node (clears key, rate
416  * etc. state).
417  */
418 void
419 ieee80211_reset_bss(struct ieee80211vap *vap)
420 {
421 	struct ieee80211com *ic = vap->iv_ic;
422 	struct ieee80211_node *ni, *obss;
423 
424 	ieee80211_node_table_reset(&ic->ic_sta, vap);
425 	/* XXX multi-bss: wrong */
426 	ieee80211_reset_erp(ic);
427 
428 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
429 	KASSERT(ni != NULL, ("unable to setup initial BSS node"));
430 	obss = vap->iv_bss;
431 	vap->iv_bss = ieee80211_ref_node(ni);
432 	if (obss != NULL) {
433 		copy_bss(ni, obss);
434 		ni->ni_intval = ic->ic_bintval;
435 		ieee80211_free_node(obss);
436 	} else
437 		IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
438 }
439 
440 static int
441 match_ssid(const struct ieee80211_node *ni,
442 	int nssid, const struct ieee80211_scan_ssid ssids[])
443 {
444 	int i;
445 
446 	for (i = 0; i < nssid; i++) {
447 		if (ni->ni_esslen == ssids[i].len &&
448 		     memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
449 			return 1;
450 	}
451 	return 0;
452 }
453 
454 /*
455  * Test a node for suitability/compatibility.
456  */
457 static int
458 check_bss(struct ieee80211vap *vap, struct ieee80211_node *ni)
459 {
460 	struct ieee80211com *ic = ni->ni_ic;
461         uint8_t rate;
462 
463 	if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
464 		return 0;
465 	if (vap->iv_opmode == IEEE80211_M_IBSS) {
466 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
467 			return 0;
468 	} else {
469 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
470 			return 0;
471 	}
472 	if (vap->iv_flags & IEEE80211_F_PRIVACY) {
473 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
474 			return 0;
475 	} else {
476 		/* XXX does this mean privacy is supported or required? */
477 		if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
478 			return 0;
479 	}
480 	rate = ieee80211_fix_rate(ni, &ni->ni_rates,
481 	    IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
482 	if (rate & IEEE80211_RATE_BASIC)
483 		return 0;
484 	if (vap->iv_des_nssid != 0 &&
485 	    !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
486 		return 0;
487 	if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
488 	    !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
489 		return 0;
490 	return 1;
491 }
492 
493 #ifdef IEEE80211_DEBUG
494 /*
495  * Display node suitability/compatibility.
496  */
497 static void
498 check_bss_debug(struct ieee80211vap *vap, struct ieee80211_node *ni)
499 {
500 	struct ieee80211com *ic = ni->ni_ic;
501         uint8_t rate;
502         int fail;
503 
504 	fail = 0;
505 	if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
506 		fail |= 0x01;
507 	if (vap->iv_opmode == IEEE80211_M_IBSS) {
508 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
509 			fail |= 0x02;
510 	} else {
511 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
512 			fail |= 0x02;
513 	}
514 	if (vap->iv_flags & IEEE80211_F_PRIVACY) {
515 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
516 			fail |= 0x04;
517 	} else {
518 		/* XXX does this mean privacy is supported or required? */
519 		if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
520 			fail |= 0x04;
521 	}
522 	rate = ieee80211_fix_rate(ni, &ni->ni_rates,
523 	     IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
524 	if (rate & IEEE80211_RATE_BASIC)
525 		fail |= 0x08;
526 	if (vap->iv_des_nssid != 0 &&
527 	    !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
528 		fail |= 0x10;
529 	if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
530 	    !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
531 		fail |= 0x20;
532 
533 	printf(" %c %s", fail ? '-' : '+', ether_sprintf(ni->ni_macaddr));
534 	printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
535 	printf(" %3d%c",
536 	    ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
537 	printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
538 	    fail & 0x08 ? '!' : ' ');
539 	printf(" %4s%c",
540 	    (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
541 	    (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
542 	    "????",
543 	    fail & 0x02 ? '!' : ' ');
544 	printf(" %3s%c ",
545 	    (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?  "wep" : "no",
546 	    fail & 0x04 ? '!' : ' ');
547 	ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
548 	printf("%s\n", fail & 0x10 ? "!" : "");
549 }
550 #endif /* IEEE80211_DEBUG */
551 
552 /*
553  * Handle 802.11 ad hoc network merge.  The
554  * convention, set by the Wireless Ethernet Compatibility Alliance
555  * (WECA), is that an 802.11 station will change its BSSID to match
556  * the "oldest" 802.11 ad hoc network, on the same channel, that
557  * has the station's desired SSID.  The "oldest" 802.11 network
558  * sends beacons with the greatest TSF timestamp.
559  *
560  * The caller is assumed to validate TSF's before attempting a merge.
561  *
562  * Return !0 if the BSSID changed, 0 otherwise.
563  */
564 int
565 ieee80211_ibss_merge(struct ieee80211_node *ni)
566 {
567 	struct ieee80211vap *vap = ni->ni_vap;
568 #ifdef IEEE80211_DEBUG
569 	struct ieee80211com *ic = ni->ni_ic;
570 #endif
571 
572 	if (ni == vap->iv_bss ||
573 	    IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid)) {
574 		/* unchanged, nothing to do */
575 		return 0;
576 	}
577 	if (!check_bss(vap, ni)) {
578 		/* capabilities mismatch */
579 		IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
580 		    "%s: merge failed, capabilities mismatch\n", __func__);
581 #ifdef IEEE80211_DEBUG
582 		if (ieee80211_msg_assoc(vap))
583 			check_bss_debug(vap, ni);
584 #endif
585 		vap->iv_stats.is_ibss_capmismatch++;
586 		return 0;
587 	}
588 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
589 		"%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
590 		ether_sprintf(ni->ni_bssid),
591 		ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
592 		ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
593 		ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : ""
594 	);
595 	return ieee80211_sta_join1(ieee80211_ref_node(ni));
596 }
597 
598 /*
599  * Calculate HT channel promotion flags for all vaps.
600  * This assumes ni_chan have been setup for each vap.
601  */
602 static int
603 gethtadjustflags(struct ieee80211com *ic)
604 {
605 	struct ieee80211vap *vap;
606 	int flags;
607 
608 	flags = 0;
609 	/* XXX locking */
610 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
611 		if (vap->iv_state < IEEE80211_S_RUN)
612 			continue;
613 		switch (vap->iv_opmode) {
614 		case IEEE80211_M_WDS:
615 		case IEEE80211_M_STA:
616 		case IEEE80211_M_AHDEMO:
617 		case IEEE80211_M_HOSTAP:
618 		case IEEE80211_M_IBSS:
619 		case IEEE80211_M_MBSS:
620 			flags |= ieee80211_htchanflags(vap->iv_bss->ni_chan);
621 			break;
622 		default:
623 			break;
624 		}
625 	}
626 	return flags;
627 }
628 
629 /*
630  * Check if the current channel needs to change based on whether
631  * any vap's are using HT20/HT40.  This is used to sync the state
632  * of ic_curchan after a channel width change on a running vap.
633  */
634 void
635 ieee80211_sync_curchan(struct ieee80211com *ic)
636 {
637 	struct ieee80211_channel *c;
638 
639 	c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan, gethtadjustflags(ic));
640 	if (c != ic->ic_curchan) {
641 		ic->ic_curchan = c;
642 		ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
643 		ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
644 		IEEE80211_UNLOCK(ic);
645 		ic->ic_set_channel(ic);
646 		ieee80211_radiotap_chan_change(ic);
647 		IEEE80211_LOCK(ic);
648 	}
649 }
650 
651 /*
652  * Setup the current channel.  The request channel may be
653  * promoted if other vap's are operating with HT20/HT40.
654  */
655 void
656 ieee80211_setupcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
657 {
658 	if (ic->ic_htcaps & IEEE80211_HTC_HT) {
659 		int flags = gethtadjustflags(ic);
660 		/*
661 		 * Check for channel promotion required to support the
662 		 * set of running vap's.  This assumes we are called
663 		 * after ni_chan is setup for each vap.
664 		 */
665 		/* NB: this assumes IEEE80211_FHT_USEHT40 > IEEE80211_FHT_HT */
666 		if (flags > ieee80211_htchanflags(c))
667 			c = ieee80211_ht_adjust_channel(ic, c, flags);
668 	}
669 	ic->ic_bsschan = ic->ic_curchan = c;
670 	ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
671 	ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
672 }
673 
674 /*
675  * Change the current channel.  The channel change is guaranteed to have
676  * happened before the next state change.
677  */
678 void
679 ieee80211_setcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
680 {
681 	ieee80211_setupcurchan(ic, c);
682 	ieee80211_runtask(ic, &ic->ic_chan_task);
683 }
684 
685 /*
686  * Join the specified IBSS/BSS network.  The node is assumed to
687  * be passed in with a held reference.
688  */
689 static int
690 ieee80211_sta_join1(struct ieee80211_node *selbs)
691 {
692 	struct ieee80211vap *vap = selbs->ni_vap;
693 	struct ieee80211com *ic = selbs->ni_ic;
694 	struct ieee80211_node *obss;
695 	int canreassoc;
696 
697 	/*
698 	 * Committed to selbs, setup state.
699 	 */
700 	obss = vap->iv_bss;
701 	/*
702 	 * Check if old+new node have the same address in which
703 	 * case we can reassociate when operating in sta mode.
704 	 */
705 	canreassoc = (obss != NULL &&
706 		vap->iv_state == IEEE80211_S_RUN &&
707 		IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
708 	vap->iv_bss = selbs;		/* NB: caller assumed to bump refcnt */
709 	if (obss != NULL) {
710 		copy_bss(selbs, obss);
711 		ieee80211_node_decref(obss);	/* iv_bss reference */
712 		ieee80211_free_node(obss);	/* station table reference */
713 		obss = NULL;		/* NB: guard against later use */
714 	}
715 
716 	/*
717 	 * Delete unusable rates; we've already checked
718 	 * that the negotiated rate set is acceptable.
719 	 */
720 	ieee80211_fix_rate(vap->iv_bss, &vap->iv_bss->ni_rates,
721 		IEEE80211_F_DODEL | IEEE80211_F_JOIN);
722 
723 	ieee80211_setcurchan(ic, selbs->ni_chan);
724 	/*
725 	 * Set the erp state (mostly the slot time) to deal with
726 	 * the auto-select case; this should be redundant if the
727 	 * mode is locked.
728 	 */
729 	ieee80211_reset_erp(ic);
730 	ieee80211_wme_initparams(vap);
731 
732 	if (vap->iv_opmode == IEEE80211_M_STA) {
733 		if (canreassoc) {
734 			/* Reassociate */
735 			ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
736 		} else {
737 			/*
738 			 * Act as if we received a DEAUTH frame in case we
739 			 * are invoked from the RUN state.  This will cause
740 			 * us to try to re-authenticate if we are operating
741 			 * as a station.
742 			 */
743 			ieee80211_new_state(vap, IEEE80211_S_AUTH,
744 				IEEE80211_FC0_SUBTYPE_DEAUTH);
745 		}
746 	} else
747 		ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
748 	return 1;
749 }
750 
751 int
752 ieee80211_sta_join(struct ieee80211vap *vap, struct ieee80211_channel *chan,
753 	const struct ieee80211_scan_entry *se)
754 {
755 	struct ieee80211com *ic = vap->iv_ic;
756 	struct ieee80211_node *ni;
757 
758 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, se->se_macaddr);
759 	if (ni == NULL) {
760 		/* XXX msg */
761 		return 0;
762 	}
763 	/*
764 	 * Expand scan state into node's format.
765 	 * XXX may not need all this stuff
766 	 */
767 	IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
768 	ni->ni_esslen = se->se_ssid[1];
769 	memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
770 	ni->ni_tstamp.tsf = se->se_tstamp.tsf;
771 	ni->ni_intval = se->se_intval;
772 	ni->ni_capinfo = se->se_capinfo;
773 	ni->ni_chan = chan;
774 	ni->ni_timoff = se->se_timoff;
775 	ni->ni_fhdwell = se->se_fhdwell;
776 	ni->ni_fhindex = se->se_fhindex;
777 	ni->ni_erp = se->se_erp;
778 	IEEE80211_RSSI_LPF(ni->ni_avgrssi, se->se_rssi);
779 	ni->ni_noise = se->se_noise;
780 	if (vap->iv_opmode == IEEE80211_M_STA) {
781 		/* NB: only infrastructure mode requires an associd */
782 		ni->ni_flags |= IEEE80211_NODE_ASSOCID;
783 	}
784 
785 	if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
786 		ieee80211_ies_expand(&ni->ni_ies);
787 #ifdef IEEE80211_SUPPORT_SUPERG
788 		if (ni->ni_ies.ath_ie != NULL)
789 			ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
790 #endif
791 		if (ni->ni_ies.htcap_ie != NULL)
792 			ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
793 		if (ni->ni_ies.htinfo_ie != NULL)
794 			ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
795 #ifdef IEEE80211_SUPPORT_MESH
796 		if (ni->ni_ies.meshid_ie != NULL)
797 			ieee80211_parse_meshid(ni, ni->ni_ies.meshid_ie);
798 #endif
799 #ifdef IEEE80211_SUPPORT_TDMA
800 		if (ni->ni_ies.tdma_ie != NULL)
801 			ieee80211_parse_tdma(ni, ni->ni_ies.tdma_ie);
802 #endif
803 	}
804 
805 	vap->iv_dtim_period = se->se_dtimperiod;
806 	vap->iv_dtim_count = 0;
807 
808 	/* NB: must be after ni_chan is setup */
809 	ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
810 		IEEE80211_F_DOSORT);
811 	if (ieee80211_iserp_rateset(&ni->ni_rates))
812 		ni->ni_flags |= IEEE80211_NODE_ERP;
813 	ieee80211_node_setuptxparms(ni);
814 	ieee80211_ratectl_node_init(ni);
815 
816 	return ieee80211_sta_join1(ieee80211_ref_node(ni));
817 }
818 
819 /*
820  * Leave the specified IBSS/BSS network.  The node is assumed to
821  * be passed in with a held reference.
822  */
823 void
824 ieee80211_sta_leave(struct ieee80211_node *ni)
825 {
826 	struct ieee80211com *ic = ni->ni_ic;
827 
828 	ic->ic_node_cleanup(ni);
829 	ieee80211_notify_node_leave(ni);
830 }
831 
832 /*
833  * Send a deauthenticate frame and drop the station.
834  */
835 void
836 ieee80211_node_deauth(struct ieee80211_node *ni, int reason)
837 {
838 	/* NB: bump the refcnt to be sure temporay nodes are not reclaimed */
839 	ieee80211_ref_node(ni);
840 	if (ni->ni_associd != 0)
841 		IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
842 	ieee80211_node_leave(ni);
843 	ieee80211_free_node(ni);
844 }
845 
846 static struct ieee80211_node *
847 node_alloc(struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
848 {
849 	struct ieee80211_node *ni;
850 
851 	ni = (struct ieee80211_node *) malloc(sizeof(struct ieee80211_node),
852 		M_80211_NODE, M_NOWAIT | M_ZERO);
853 	return ni;
854 }
855 
856 /*
857  * Initialize an ie blob with the specified data.  If previous
858  * data exists re-use the data block.  As a side effect we clear
859  * all references to specific ie's; the caller is required to
860  * recalculate them.
861  */
862 int
863 ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
864 {
865 	/* NB: assumes data+len are the last fields */
866 	memset(ies, 0, offsetof(struct ieee80211_ies, data));
867 	if (ies->data != NULL && ies->len != len) {
868 		/* data size changed */
869 		free(ies->data, M_80211_NODE_IE);
870 		ies->data = NULL;
871 	}
872 	if (ies->data == NULL) {
873 		ies->data = (uint8_t *) malloc(len, M_80211_NODE_IE, M_NOWAIT);
874 		if (ies->data == NULL) {
875 			ies->len = 0;
876 			/* NB: pointers have already been zero'd above */
877 			return 0;
878 		}
879 	}
880 	memcpy(ies->data, data, len);
881 	ies->len = len;
882 	return 1;
883 }
884 
885 /*
886  * Reclaim storage for an ie blob.
887  */
888 void
889 ieee80211_ies_cleanup(struct ieee80211_ies *ies)
890 {
891 	if (ies->data != NULL)
892 		free(ies->data, M_80211_NODE_IE);
893 }
894 
895 /*
896  * Expand an ie blob data contents and to fillin individual
897  * ie pointers.  The data blob is assumed to be well-formed;
898  * we don't do any validity checking of ie lengths.
899  */
900 void
901 ieee80211_ies_expand(struct ieee80211_ies *ies)
902 {
903 	uint8_t *ie;
904 	int ielen;
905 
906 	ie = ies->data;
907 	ielen = ies->len;
908 	while (ielen > 0) {
909 		switch (ie[0]) {
910 		case IEEE80211_ELEMID_VENDOR:
911 			if (iswpaoui(ie))
912 				ies->wpa_ie = ie;
913 			else if (iswmeoui(ie))
914 				ies->wme_ie = ie;
915 #ifdef IEEE80211_SUPPORT_SUPERG
916 			else if (isatherosoui(ie))
917 				ies->ath_ie = ie;
918 #endif
919 #ifdef IEEE80211_SUPPORT_TDMA
920 			else if (istdmaoui(ie))
921 				ies->tdma_ie = ie;
922 #endif
923 			break;
924 		case IEEE80211_ELEMID_RSN:
925 			ies->rsn_ie = ie;
926 			break;
927 		case IEEE80211_ELEMID_HTCAP:
928 			ies->htcap_ie = ie;
929 			break;
930 #ifdef IEEE80211_SUPPORT_MESH
931 		case IEEE80211_ELEMID_MESHID:
932 			ies->meshid_ie = ie;
933 			break;
934 #endif
935 		}
936 		ielen -= 2 + ie[1];
937 		ie += 2 + ie[1];
938 	}
939 }
940 
941 /*
942  * Reclaim any resources in a node and reset any critical
943  * state.  Typically nodes are free'd immediately after,
944  * but in some cases the storage may be reused so we need
945  * to insure consistent state (should probably fix that).
946  */
947 static void
948 node_cleanup(struct ieee80211_node *ni)
949 {
950 #define	N(a)	(sizeof(a)/sizeof(a[0]))
951 	struct ieee80211vap *vap = ni->ni_vap;
952 	struct ieee80211com *ic = ni->ni_ic;
953 	int i;
954 
955 	/* NB: preserve ni_table */
956 	if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
957 		if (vap->iv_opmode != IEEE80211_M_STA)
958 			vap->iv_ps_sta--;
959 		ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
960 		IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
961 		    "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
962 	}
963 	/*
964 	 * Cleanup any HT-related state.
965 	 */
966 	if (ni->ni_flags & IEEE80211_NODE_HT)
967 		ieee80211_ht_node_cleanup(ni);
968 #ifdef IEEE80211_SUPPORT_SUPERG
969 	else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
970 		ieee80211_ff_node_cleanup(ni);
971 #endif
972 #ifdef IEEE80211_SUPPORT_MESH
973 	/*
974 	 * Cleanup any mesh-related state.
975 	 */
976 	if (vap->iv_opmode == IEEE80211_M_MBSS)
977 		ieee80211_mesh_node_cleanup(ni);
978 #endif
979 	/*
980 	 * Clear any staging queue entries.
981 	 */
982 	ieee80211_ageq_drain_node(&ic->ic_stageq, ni);
983 
984 	/*
985 	 * Clear AREF flag that marks the authorization refcnt bump
986 	 * has happened.  This is probably not needed as the node
987 	 * should always be removed from the table so not found but
988 	 * do it just in case.
989 	 * Likewise clear the ASSOCID flag as these flags are intended
990 	 * to be managed in tandem.
991 	 */
992 	ni->ni_flags &= ~(IEEE80211_NODE_AREF | IEEE80211_NODE_ASSOCID);
993 
994 	/*
995 	 * Drain power save queue and, if needed, clear TIM.
996 	 */
997 	if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
998 		vap->iv_set_tim(ni, 0);
999 
1000 	ni->ni_associd = 0;
1001 	if (ni->ni_challenge != NULL) {
1002 		free(ni->ni_challenge, M_80211_NODE);
1003 		ni->ni_challenge = NULL;
1004 	}
1005 	/*
1006 	 * Preserve SSID, WPA, and WME ie's so the bss node is
1007 	 * reusable during a re-auth/re-assoc state transition.
1008 	 * If we remove these data they will not be recreated
1009 	 * because they come from a probe-response or beacon frame
1010 	 * which cannot be expected prior to the association-response.
1011 	 * This should not be an issue when operating in other modes
1012 	 * as stations leaving always go through a full state transition
1013 	 * which will rebuild this state.
1014 	 *
1015 	 * XXX does this leave us open to inheriting old state?
1016 	 */
1017 	for (i = 0; i < N(ni->ni_rxfrag); i++)
1018 		if (ni->ni_rxfrag[i] != NULL) {
1019 			m_freem(ni->ni_rxfrag[i]);
1020 			ni->ni_rxfrag[i] = NULL;
1021 		}
1022 	/*
1023 	 * Must be careful here to remove any key map entry w/o a LOR.
1024 	 */
1025 	ieee80211_node_delucastkey(ni);
1026 #undef N
1027 }
1028 
1029 static void
1030 node_free(struct ieee80211_node *ni)
1031 {
1032 	struct ieee80211com *ic = ni->ni_ic;
1033 
1034 	ieee80211_ratectl_node_deinit(ni);
1035 	ic->ic_node_cleanup(ni);
1036 	ieee80211_ies_cleanup(&ni->ni_ies);
1037 	ieee80211_psq_cleanup(&ni->ni_psq);
1038 	free(ni, M_80211_NODE);
1039 }
1040 
1041 static void
1042 node_age(struct ieee80211_node *ni)
1043 {
1044 	struct ieee80211vap *vap = ni->ni_vap;
1045 
1046 	IEEE80211_NODE_LOCK_ASSERT(&vap->iv_ic->ic_sta);
1047 
1048 	/*
1049 	 * Age frames on the power save queue.
1050 	 */
1051 	if (ieee80211_node_psq_age(ni) != 0 &&
1052 	    ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
1053 		vap->iv_set_tim(ni, 0);
1054 	/*
1055 	 * Age out HT resources (e.g. frames on the
1056 	 * A-MPDU reorder queues).
1057 	 */
1058 	if (ni->ni_associd != 0 && (ni->ni_flags & IEEE80211_NODE_HT))
1059 		ieee80211_ht_node_age(ni);
1060 }
1061 
1062 static int8_t
1063 node_getrssi(const struct ieee80211_node *ni)
1064 {
1065 	uint32_t avgrssi = ni->ni_avgrssi;
1066 	int32_t rssi;
1067 
1068 	if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER)
1069 		return 0;
1070 	rssi = IEEE80211_RSSI_GET(avgrssi);
1071 	return rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
1072 }
1073 
1074 static void
1075 node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
1076 {
1077 	*rssi = node_getrssi(ni);
1078 	*noise = ni->ni_noise;
1079 }
1080 
1081 static void
1082 node_getmimoinfo(const struct ieee80211_node *ni,
1083 	struct ieee80211_mimo_info *info)
1084 {
1085 	int i;
1086 	uint32_t avgrssi;
1087 	int32_t rssi;
1088 
1089 	bzero(info, sizeof(*info));
1090 
1091 	for (i = 0; i < ni->ni_mimo_chains; i++) {
1092 		avgrssi = ni->ni_mimo_rssi_ctl[i];
1093 		if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER) {
1094 			info->rssi[i] = 0;
1095 		} else {
1096 			rssi = IEEE80211_RSSI_GET(avgrssi);
1097 			info->rssi[i] = rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
1098 		}
1099 		info->noise[i] = ni->ni_mimo_noise_ctl[i];
1100 	}
1101 
1102 	/* XXX ext radios? */
1103 
1104 	/* XXX EVM? */
1105 }
1106 
1107 struct ieee80211_node *
1108 ieee80211_alloc_node(struct ieee80211_node_table *nt,
1109 	struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
1110 {
1111 	struct ieee80211com *ic = nt->nt_ic;
1112 	struct ieee80211_node *ni;
1113 	int hash;
1114 
1115 	ni = ic->ic_node_alloc(vap, macaddr);
1116 	if (ni == NULL) {
1117 		vap->iv_stats.is_rx_nodealloc++;
1118 		return NULL;
1119 	}
1120 
1121 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1122 		"%s %p<%s> in %s table\n", __func__, ni,
1123 		ether_sprintf(macaddr), nt->nt_name);
1124 
1125 	IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
1126 	hash = IEEE80211_NODE_HASH(ic, macaddr);
1127 	ieee80211_node_initref(ni);		/* mark referenced */
1128 	ni->ni_chan = IEEE80211_CHAN_ANYC;
1129 	ni->ni_authmode = IEEE80211_AUTH_OPEN;
1130 	ni->ni_txpower = ic->ic_txpowlimit;	/* max power */
1131 	ni->ni_txparms = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
1132 	ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
1133 	ni->ni_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
1134 	ni->ni_inact_reload = nt->nt_inact_init;
1135 	ni->ni_inact = ni->ni_inact_reload;
1136 	ni->ni_ath_defkeyix = 0x7fff;
1137 	ieee80211_psq_init(&ni->ni_psq, "unknown");
1138 #ifdef IEEE80211_SUPPORT_MESH
1139 	if (vap->iv_opmode == IEEE80211_M_MBSS)
1140 		ieee80211_mesh_node_init(vap, ni);
1141 #endif
1142 	IEEE80211_NODE_LOCK(nt);
1143 	TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
1144 	LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
1145 	ni->ni_table = nt;
1146 	ni->ni_vap = vap;
1147 	ni->ni_ic = ic;
1148 	IEEE80211_NODE_UNLOCK(nt);
1149 
1150 	IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
1151 	    "%s: inact_reload %u", __func__, ni->ni_inact_reload);
1152 
1153 	ieee80211_ratectl_node_init(ni);
1154 
1155 	return ni;
1156 }
1157 
1158 /*
1159  * Craft a temporary node suitable for sending a management frame
1160  * to the specified station.  We craft only as much state as we
1161  * need to do the work since the node will be immediately reclaimed
1162  * once the send completes.
1163  */
1164 struct ieee80211_node *
1165 ieee80211_tmp_node(struct ieee80211vap *vap,
1166 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1167 {
1168 	struct ieee80211com *ic = vap->iv_ic;
1169 	struct ieee80211_node *ni;
1170 
1171 	ni = ic->ic_node_alloc(vap, macaddr);
1172 	if (ni != NULL) {
1173 		struct ieee80211_node *bss = vap->iv_bss;
1174 
1175 		IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1176 			"%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
1177 
1178 		ni->ni_table = NULL;		/* NB: pedantic */
1179 		ni->ni_ic = ic;			/* NB: needed to set channel */
1180 		ni->ni_vap = vap;
1181 
1182 		IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
1183 		IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
1184 		ieee80211_node_initref(ni);		/* mark referenced */
1185 		/* NB: required by ieee80211_fix_rate */
1186 		ieee80211_node_set_chan(ni, bss->ni_chan);
1187 		ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
1188 			IEEE80211_KEYIX_NONE);
1189 		ni->ni_txpower = bss->ni_txpower;
1190 		/* XXX optimize away */
1191 		ieee80211_psq_init(&ni->ni_psq, "unknown");
1192 
1193 		ieee80211_ratectl_node_init(ni);
1194 	} else {
1195 		/* XXX msg */
1196 		vap->iv_stats.is_rx_nodealloc++;
1197 	}
1198 	return ni;
1199 }
1200 
1201 struct ieee80211_node *
1202 ieee80211_dup_bss(struct ieee80211vap *vap,
1203 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1204 {
1205 	struct ieee80211com *ic = vap->iv_ic;
1206 	struct ieee80211_node *ni;
1207 
1208 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, macaddr);
1209 	if (ni != NULL) {
1210 		struct ieee80211_node *bss = vap->iv_bss;
1211 		/*
1212 		 * Inherit from iv_bss.
1213 		 */
1214 		copy_bss(ni, bss);
1215 		IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
1216 		ieee80211_node_set_chan(ni, bss->ni_chan);
1217 	}
1218 	return ni;
1219 }
1220 
1221 /*
1222  * Create a bss node for a legacy WDS vap.  The far end does
1223  * not associate so we just create create a new node and
1224  * simulate an association.  The caller is responsible for
1225  * installing the node as the bss node and handling any further
1226  * setup work like authorizing the port.
1227  */
1228 struct ieee80211_node *
1229 ieee80211_node_create_wds(struct ieee80211vap *vap,
1230 	const uint8_t bssid[IEEE80211_ADDR_LEN], struct ieee80211_channel *chan)
1231 {
1232 	struct ieee80211com *ic = vap->iv_ic;
1233 	struct ieee80211_node *ni;
1234 
1235 	/* XXX check if node already in sta table? */
1236 	ni = ieee80211_alloc_node(&ic->ic_sta, vap, bssid);
1237 	if (ni != NULL) {
1238 		ni->ni_wdsvap = vap;
1239 		IEEE80211_ADDR_COPY(ni->ni_bssid, bssid);
1240 		/*
1241 		 * Inherit any manually configured settings.
1242 		 */
1243 		copy_bss(ni, vap->iv_bss);
1244 		ieee80211_node_set_chan(ni, chan);
1245 		/* NB: propagate ssid so available to WPA supplicant */
1246 		ni->ni_esslen = vap->iv_des_ssid[0].len;
1247 		memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
1248 		/* NB: no associd for peer */
1249 		/*
1250 		 * There are no management frames to use to
1251 		 * discover neighbor capabilities, so blindly
1252 		 * propagate the local configuration.
1253 		 */
1254 		if (vap->iv_flags & IEEE80211_F_WME)
1255 			ni->ni_flags |= IEEE80211_NODE_QOS;
1256 #ifdef IEEE80211_SUPPORT_SUPERG
1257 		if (vap->iv_flags & IEEE80211_F_FF)
1258 			ni->ni_flags |= IEEE80211_NODE_FF;
1259 #endif
1260 		if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
1261 		    (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1262 			/*
1263 			 * Device is HT-capable and HT is enabled for
1264 			 * the vap; setup HT operation.  On return
1265 			 * ni_chan will be adjusted to an HT channel.
1266 			 */
1267 			ieee80211_ht_wds_init(ni);
1268 		} else {
1269 			struct ieee80211_channel *c = ni->ni_chan;
1270 			/*
1271 			 * Force a legacy channel to be used.
1272 			 */
1273 			c = ieee80211_find_channel(ic,
1274 			    c->ic_freq, c->ic_flags &~ IEEE80211_CHAN_HT);
1275 			KASSERT(c != NULL, ("no legacy channel, %u/%x",
1276 			    ni->ni_chan->ic_freq, ni->ni_chan->ic_flags));
1277 			ni->ni_chan = c;
1278 		}
1279 	}
1280 	return ni;
1281 }
1282 
1283 struct ieee80211_node *
1284 #ifdef IEEE80211_DEBUG_REFCNT
1285 ieee80211_find_node_locked_debug(struct ieee80211_node_table *nt,
1286 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1287 #else
1288 ieee80211_find_node_locked(struct ieee80211_node_table *nt,
1289 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1290 #endif
1291 {
1292 	struct ieee80211_node *ni;
1293 	int hash;
1294 
1295 	IEEE80211_NODE_LOCK_ASSERT(nt);
1296 
1297 	hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
1298 	LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1299 		if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
1300 			ieee80211_ref_node(ni);	/* mark referenced */
1301 #ifdef IEEE80211_DEBUG_REFCNT
1302 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1303 			    "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1304 			    func, line,
1305 			    ni, ether_sprintf(ni->ni_macaddr),
1306 			    ieee80211_node_refcnt(ni));
1307 #endif
1308 			return ni;
1309 		}
1310 	}
1311 	return NULL;
1312 }
1313 
1314 struct ieee80211_node *
1315 #ifdef IEEE80211_DEBUG_REFCNT
1316 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
1317 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1318 #else
1319 ieee80211_find_node(struct ieee80211_node_table *nt,
1320 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1321 #endif
1322 {
1323 	struct ieee80211_node *ni;
1324 
1325 	IEEE80211_NODE_LOCK(nt);
1326 	ni = ieee80211_find_node_locked(nt, macaddr);
1327 	IEEE80211_NODE_UNLOCK(nt);
1328 	return ni;
1329 }
1330 
1331 struct ieee80211_node *
1332 #ifdef IEEE80211_DEBUG_REFCNT
1333 ieee80211_find_vap_node_locked_debug(struct ieee80211_node_table *nt,
1334 	const struct ieee80211vap *vap,
1335 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1336 #else
1337 ieee80211_find_vap_node_locked(struct ieee80211_node_table *nt,
1338 	const struct ieee80211vap *vap,
1339 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1340 #endif
1341 {
1342 	struct ieee80211_node *ni;
1343 	int hash;
1344 
1345 	IEEE80211_NODE_LOCK_ASSERT(nt);
1346 
1347 	hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
1348 	LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1349 		if (ni->ni_vap == vap &&
1350 		    IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
1351 			ieee80211_ref_node(ni);	/* mark referenced */
1352 #ifdef IEEE80211_DEBUG_REFCNT
1353 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1354 			    "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1355 			    func, line,
1356 			    ni, ether_sprintf(ni->ni_macaddr),
1357 			    ieee80211_node_refcnt(ni));
1358 #endif
1359 			return ni;
1360 		}
1361 	}
1362 	return NULL;
1363 }
1364 
1365 struct ieee80211_node *
1366 #ifdef IEEE80211_DEBUG_REFCNT
1367 ieee80211_find_vap_node_debug(struct ieee80211_node_table *nt,
1368 	const struct ieee80211vap *vap,
1369 	const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
1370 #else
1371 ieee80211_find_vap_node(struct ieee80211_node_table *nt,
1372 	const struct ieee80211vap *vap,
1373 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1374 #endif
1375 {
1376 	struct ieee80211_node *ni;
1377 
1378 	IEEE80211_NODE_LOCK(nt);
1379 	ni = ieee80211_find_vap_node_locked(nt, vap, macaddr);
1380 	IEEE80211_NODE_UNLOCK(nt);
1381 	return ni;
1382 }
1383 
1384 /*
1385  * Fake up a node; this handles node discovery in adhoc mode.
1386  * Note that for the driver's benefit we we treat this like
1387  * an association so the driver has an opportunity to setup
1388  * it's private state.
1389  */
1390 struct ieee80211_node *
1391 ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
1392 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1393 {
1394 	struct ieee80211_node *ni;
1395 
1396 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1397 	    "%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
1398 	ni = ieee80211_dup_bss(vap, macaddr);
1399 	if (ni != NULL) {
1400 		struct ieee80211com *ic = vap->iv_ic;
1401 
1402 		/* XXX no rate negotiation; just dup */
1403 		ni->ni_rates = vap->iv_bss->ni_rates;
1404 		if (ieee80211_iserp_rateset(&ni->ni_rates))
1405 			ni->ni_flags |= IEEE80211_NODE_ERP;
1406 		if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
1407 			/*
1408 			 * In adhoc demo mode there are no management
1409 			 * frames to use to discover neighbor capabilities,
1410 			 * so blindly propagate the local configuration
1411 			 * so we can do interesting things (e.g. use
1412 			 * WME to disable ACK's).
1413 			 */
1414 			if (vap->iv_flags & IEEE80211_F_WME)
1415 				ni->ni_flags |= IEEE80211_NODE_QOS;
1416 #ifdef IEEE80211_SUPPORT_SUPERG
1417 			if (vap->iv_flags & IEEE80211_F_FF)
1418 				ni->ni_flags |= IEEE80211_NODE_FF;
1419 #endif
1420 		}
1421 		ieee80211_node_setuptxparms(ni);
1422 		ieee80211_ratectl_node_init(ni);
1423 		if (ic->ic_newassoc != NULL)
1424 			ic->ic_newassoc(ni, 1);
1425 		/* XXX not right for 802.1x/WPA */
1426 		ieee80211_node_authorize(ni);
1427 	}
1428 	return ni;
1429 }
1430 
1431 void
1432 ieee80211_init_neighbor(struct ieee80211_node *ni,
1433 	const struct ieee80211_frame *wh,
1434 	const struct ieee80211_scanparams *sp)
1435 {
1436 	ni->ni_esslen = sp->ssid[1];
1437 	memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
1438 	IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
1439 	memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
1440 	ni->ni_intval = sp->bintval;
1441 	ni->ni_capinfo = sp->capinfo;
1442 	ni->ni_chan = ni->ni_ic->ic_curchan;
1443 	ni->ni_fhdwell = sp->fhdwell;
1444 	ni->ni_fhindex = sp->fhindex;
1445 	ni->ni_erp = sp->erp;
1446 	ni->ni_timoff = sp->timoff;
1447 #ifdef IEEE80211_SUPPORT_MESH
1448 	if (ni->ni_vap->iv_opmode == IEEE80211_M_MBSS)
1449 		ieee80211_mesh_init_neighbor(ni, wh, sp);
1450 #endif
1451 	if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
1452 		ieee80211_ies_expand(&ni->ni_ies);
1453 		if (ni->ni_ies.wme_ie != NULL)
1454 			ni->ni_flags |= IEEE80211_NODE_QOS;
1455 		else
1456 			ni->ni_flags &= ~IEEE80211_NODE_QOS;
1457 #ifdef IEEE80211_SUPPORT_SUPERG
1458 		if (ni->ni_ies.ath_ie != NULL)
1459 			ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
1460 #endif
1461 	}
1462 
1463 	/* NB: must be after ni_chan is setup */
1464 	ieee80211_setup_rates(ni, sp->rates, sp->xrates,
1465 		IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1466 		IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1467 }
1468 
1469 /*
1470  * Do node discovery in adhoc mode on receipt of a beacon
1471  * or probe response frame.  Note that for the driver's
1472  * benefit we we treat this like an association so the
1473  * driver has an opportunity to setup it's private state.
1474  */
1475 struct ieee80211_node *
1476 ieee80211_add_neighbor(struct ieee80211vap *vap,
1477 	const struct ieee80211_frame *wh,
1478 	const struct ieee80211_scanparams *sp)
1479 {
1480 	struct ieee80211_node *ni;
1481 
1482 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1483 	    "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
1484 	ni = ieee80211_dup_bss(vap, wh->i_addr2);/* XXX alloc_node? */
1485 	if (ni != NULL) {
1486 		struct ieee80211com *ic = vap->iv_ic;
1487 
1488 		ieee80211_init_neighbor(ni, wh, sp);
1489 		if (ieee80211_iserp_rateset(&ni->ni_rates))
1490 			ni->ni_flags |= IEEE80211_NODE_ERP;
1491 		ieee80211_node_setuptxparms(ni);
1492 		ieee80211_ratectl_node_init(ni);
1493 		if (ic->ic_newassoc != NULL)
1494 			ic->ic_newassoc(ni, 1);
1495 		/* XXX not right for 802.1x/WPA */
1496 		ieee80211_node_authorize(ni);
1497 	}
1498 	return ni;
1499 }
1500 
1501 #define	IS_PROBEREQ(wh) \
1502 	((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK|IEEE80211_FC0_SUBTYPE_MASK)) \
1503 	    == (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
1504 #define	IS_BCAST_PROBEREQ(wh) \
1505 	(IS_PROBEREQ(wh) && IEEE80211_IS_MULTICAST( \
1506 	    ((const struct ieee80211_frame *)(wh))->i_addr3))
1507 
1508 static __inline struct ieee80211_node *
1509 _find_rxnode(struct ieee80211_node_table *nt,
1510     const struct ieee80211_frame_min *wh)
1511 {
1512 	if (IS_BCAST_PROBEREQ(wh))
1513 		return NULL;		/* spam bcast probe req to all vap's */
1514 	return ieee80211_find_node_locked(nt, wh->i_addr2);
1515 }
1516 
1517 /*
1518  * Locate the node for sender, track state, and then pass the
1519  * (referenced) node up to the 802.11 layer for its use.  Note
1520  * we can return NULL if the sender is not in the table.
1521  */
1522 struct ieee80211_node *
1523 #ifdef IEEE80211_DEBUG_REFCNT
1524 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
1525 	const struct ieee80211_frame_min *wh, const char *func, int line)
1526 #else
1527 ieee80211_find_rxnode(struct ieee80211com *ic,
1528 	const struct ieee80211_frame_min *wh)
1529 #endif
1530 {
1531 	struct ieee80211_node_table *nt;
1532 	struct ieee80211_node *ni;
1533 
1534 	nt = &ic->ic_sta;
1535 	IEEE80211_NODE_LOCK(nt);
1536 	ni = _find_rxnode(nt, wh);
1537 	IEEE80211_NODE_UNLOCK(nt);
1538 
1539 	return ni;
1540 }
1541 
1542 /*
1543  * Like ieee80211_find_rxnode but use the supplied h/w
1544  * key index as a hint to locate the node in the key
1545  * mapping table.  If an entry is present at the key
1546  * index we return it; otherwise do a normal lookup and
1547  * update the mapping table if the station has a unicast
1548  * key assigned to it.
1549  */
1550 struct ieee80211_node *
1551 #ifdef IEEE80211_DEBUG_REFCNT
1552 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
1553 	const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
1554 	const char *func, int line)
1555 #else
1556 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
1557 	const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
1558 #endif
1559 {
1560 	struct ieee80211_node_table *nt;
1561 	struct ieee80211_node *ni;
1562 
1563 	nt = &ic->ic_sta;
1564 	IEEE80211_NODE_LOCK(nt);
1565 	if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
1566 		ni = nt->nt_keyixmap[keyix];
1567 	else
1568 		ni = NULL;
1569 	if (ni == NULL) {
1570 		ni = _find_rxnode(nt, wh);
1571 		if (ni != NULL && nt->nt_keyixmap != NULL) {
1572 			/*
1573 			 * If the station has a unicast key cache slot
1574 			 * assigned update the key->node mapping table.
1575 			 */
1576 			keyix = ni->ni_ucastkey.wk_rxkeyix;
1577 			/* XXX can keyixmap[keyix] != NULL? */
1578 			if (keyix < nt->nt_keyixmax &&
1579 			    nt->nt_keyixmap[keyix] == NULL) {
1580 				IEEE80211_DPRINTF(ni->ni_vap,
1581 				    IEEE80211_MSG_NODE,
1582 				    "%s: add key map entry %p<%s> refcnt %d\n",
1583 				    __func__, ni, ether_sprintf(ni->ni_macaddr),
1584 				    ieee80211_node_refcnt(ni)+1);
1585 				nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
1586 			}
1587 		}
1588 	} else {
1589 		if (IS_BCAST_PROBEREQ(wh))
1590 			ni = NULL;	/* spam bcast probe req to all vap's */
1591 		else
1592 			ieee80211_ref_node(ni);
1593 	}
1594 	IEEE80211_NODE_UNLOCK(nt);
1595 
1596 	return ni;
1597 }
1598 #undef IS_BCAST_PROBEREQ
1599 #undef IS_PROBEREQ
1600 
1601 /*
1602  * Return a reference to the appropriate node for sending
1603  * a data frame.  This handles node discovery in adhoc networks.
1604  */
1605 struct ieee80211_node *
1606 #ifdef IEEE80211_DEBUG_REFCNT
1607 ieee80211_find_txnode_debug(struct ieee80211vap *vap,
1608 	const uint8_t macaddr[IEEE80211_ADDR_LEN],
1609 	const char *func, int line)
1610 #else
1611 ieee80211_find_txnode(struct ieee80211vap *vap,
1612 	const uint8_t macaddr[IEEE80211_ADDR_LEN])
1613 #endif
1614 {
1615 	struct ieee80211_node_table *nt = &vap->iv_ic->ic_sta;
1616 	struct ieee80211_node *ni;
1617 
1618 	/*
1619 	 * The destination address should be in the node table
1620 	 * unless this is a multicast/broadcast frame.  We can
1621 	 * also optimize station mode operation, all frames go
1622 	 * to the bss node.
1623 	 */
1624 	/* XXX can't hold lock across dup_bss 'cuz of recursive locking */
1625 	IEEE80211_NODE_LOCK(nt);
1626 	if (vap->iv_opmode == IEEE80211_M_STA ||
1627 	    vap->iv_opmode == IEEE80211_M_WDS ||
1628 	    IEEE80211_IS_MULTICAST(macaddr))
1629 		ni = ieee80211_ref_node(vap->iv_bss);
1630 	else
1631 		ni = ieee80211_find_node_locked(nt, macaddr);
1632 	IEEE80211_NODE_UNLOCK(nt);
1633 
1634 	if (ni == NULL) {
1635 		if (vap->iv_opmode == IEEE80211_M_IBSS ||
1636 		    vap->iv_opmode == IEEE80211_M_AHDEMO) {
1637 			/*
1638 			 * In adhoc mode cons up a node for the destination.
1639 			 * Note that we need an additional reference for the
1640 			 * caller to be consistent with
1641 			 * ieee80211_find_node_locked.
1642 			 */
1643 			ni = ieee80211_fakeup_adhoc_node(vap, macaddr);
1644 			if (ni != NULL)
1645 				(void) ieee80211_ref_node(ni);
1646 		} else {
1647 			IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, macaddr,
1648 			    "no node, discard frame (%s)", __func__);
1649 			vap->iv_stats.is_tx_nonode++;
1650 		}
1651 	}
1652 	return ni;
1653 }
1654 
1655 static void
1656 _ieee80211_free_node(struct ieee80211_node *ni)
1657 {
1658 	struct ieee80211_node_table *nt = ni->ni_table;
1659 
1660 	/*
1661 	 * NB: careful about referencing the vap as it may be
1662 	 * gone if the last reference was held by a driver.
1663 	 * We know the com will always be present so it's safe
1664 	 * to use ni_ic below to reclaim resources.
1665 	 */
1666 #if 0
1667 	IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1668 		"%s %p<%s> in %s table\n", __func__, ni,
1669 		ether_sprintf(ni->ni_macaddr),
1670 		nt != NULL ? nt->nt_name : "<gone>");
1671 #endif
1672 	if (ni->ni_associd != 0) {
1673 		struct ieee80211vap *vap = ni->ni_vap;
1674 		if (vap->iv_aid_bitmap != NULL)
1675 			IEEE80211_AID_CLR(vap, ni->ni_associd);
1676 	}
1677 	if (nt != NULL) {
1678 		TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
1679 		LIST_REMOVE(ni, ni_hash);
1680 	}
1681 	ni->ni_ic->ic_node_free(ni);
1682 }
1683 
1684 void
1685 #ifdef IEEE80211_DEBUG_REFCNT
1686 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
1687 #else
1688 ieee80211_free_node(struct ieee80211_node *ni)
1689 #endif
1690 {
1691 	struct ieee80211_node_table *nt = ni->ni_table;
1692 
1693 #ifdef IEEE80211_DEBUG_REFCNT
1694 	IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1695 		"%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
1696 		 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
1697 #endif
1698 	if (nt != NULL) {
1699 		IEEE80211_NODE_LOCK(nt);
1700 		if (ieee80211_node_dectestref(ni)) {
1701 			/*
1702 			 * Last reference, reclaim state.
1703 			 */
1704 			_ieee80211_free_node(ni);
1705 		} else if (ieee80211_node_refcnt(ni) == 1 &&
1706 		    nt->nt_keyixmap != NULL) {
1707 			ieee80211_keyix keyix;
1708 			/*
1709 			 * Check for a last reference in the key mapping table.
1710 			 */
1711 			keyix = ni->ni_ucastkey.wk_rxkeyix;
1712 			if (keyix < nt->nt_keyixmax &&
1713 			    nt->nt_keyixmap[keyix] == ni) {
1714 				IEEE80211_DPRINTF(ni->ni_vap,
1715 				    IEEE80211_MSG_NODE,
1716 				    "%s: %p<%s> clear key map entry", __func__,
1717 				    ni, ether_sprintf(ni->ni_macaddr));
1718 				nt->nt_keyixmap[keyix] = NULL;
1719 				ieee80211_node_decref(ni); /* XXX needed? */
1720 				_ieee80211_free_node(ni);
1721 			}
1722 		}
1723 		IEEE80211_NODE_UNLOCK(nt);
1724 	} else {
1725 		if (ieee80211_node_dectestref(ni))
1726 			_ieee80211_free_node(ni);
1727 	}
1728 }
1729 
1730 /*
1731  * Reclaim a unicast key and clear any key cache state.
1732  */
1733 int
1734 ieee80211_node_delucastkey(struct ieee80211_node *ni)
1735 {
1736 	struct ieee80211com *ic = ni->ni_ic;
1737 	struct ieee80211_node_table *nt = &ic->ic_sta;
1738 	struct ieee80211_node *nikey;
1739 	ieee80211_keyix keyix;
1740 	int isowned, status;
1741 
1742 	/*
1743 	 * NB: We must beware of LOR here; deleting the key
1744 	 * can cause the crypto layer to block traffic updates
1745 	 * which can generate a LOR against the node table lock;
1746 	 * grab it here and stash the key index for our use below.
1747 	 *
1748 	 * Must also beware of recursion on the node table lock.
1749 	 * When called from node_cleanup we may already have
1750 	 * the node table lock held.  Unfortunately there's no
1751 	 * way to separate out this path so we must do this
1752 	 * conditionally.
1753 	 */
1754 	isowned = IEEE80211_NODE_IS_LOCKED(nt);
1755 	if (!isowned)
1756 		IEEE80211_NODE_LOCK(nt);
1757 	nikey = NULL;
1758 	status = 1;		/* NB: success */
1759 	if (ni->ni_ucastkey.wk_keyix != IEEE80211_KEYIX_NONE) {
1760 		keyix = ni->ni_ucastkey.wk_rxkeyix;
1761 		status = ieee80211_crypto_delkey(ni->ni_vap, &ni->ni_ucastkey);
1762 		if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
1763 			nikey = nt->nt_keyixmap[keyix];
1764 			nt->nt_keyixmap[keyix] = NULL;
1765 		}
1766 	}
1767 	if (!isowned)
1768 		IEEE80211_NODE_UNLOCK(nt);
1769 
1770 	if (nikey != NULL) {
1771 		KASSERT(nikey == ni,
1772 			("key map out of sync, ni %p nikey %p", ni, nikey));
1773 		IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1774 			"%s: delete key map entry %p<%s> refcnt %d\n",
1775 			__func__, ni, ether_sprintf(ni->ni_macaddr),
1776 			ieee80211_node_refcnt(ni)-1);
1777 		ieee80211_free_node(ni);
1778 	}
1779 	return status;
1780 }
1781 
1782 /*
1783  * Reclaim a node.  If this is the last reference count then
1784  * do the normal free work.  Otherwise remove it from the node
1785  * table and mark it gone by clearing the back-reference.
1786  */
1787 static void
1788 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
1789 {
1790 	ieee80211_keyix keyix;
1791 
1792 	IEEE80211_NODE_LOCK_ASSERT(nt);
1793 
1794 	IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1795 		"%s: remove %p<%s> from %s table, refcnt %d\n",
1796 		__func__, ni, ether_sprintf(ni->ni_macaddr),
1797 		nt->nt_name, ieee80211_node_refcnt(ni)-1);
1798 	/*
1799 	 * Clear any entry in the unicast key mapping table.
1800 	 * We need to do it here so rx lookups don't find it
1801 	 * in the mapping table even if it's not in the hash
1802 	 * table.  We cannot depend on the mapping table entry
1803 	 * being cleared because the node may not be free'd.
1804 	 */
1805 	keyix = ni->ni_ucastkey.wk_rxkeyix;
1806 	if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
1807 	    nt->nt_keyixmap[keyix] == ni) {
1808 		IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
1809 			"%s: %p<%s> clear key map entry %u\n",
1810 			__func__, ni, ether_sprintf(ni->ni_macaddr), keyix);
1811 		nt->nt_keyixmap[keyix] = NULL;
1812 		ieee80211_node_decref(ni);	/* NB: don't need free */
1813 	}
1814 	if (!ieee80211_node_dectestref(ni)) {
1815 		/*
1816 		 * Other references are present, just remove the
1817 		 * node from the table so it cannot be found.  When
1818 		 * the references are dropped storage will be
1819 		 * reclaimed.
1820 		 */
1821 		TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
1822 		LIST_REMOVE(ni, ni_hash);
1823 		ni->ni_table = NULL;		/* clear reference */
1824 	} else
1825 		_ieee80211_free_node(ni);
1826 }
1827 
1828 /*
1829  * Node table support.
1830  */
1831 
1832 static void
1833 ieee80211_node_table_init(struct ieee80211com *ic,
1834 	struct ieee80211_node_table *nt,
1835 	const char *name, int inact, int keyixmax)
1836 {
1837 	struct ifnet *ifp = ic->ic_ifp;
1838 
1839 	nt->nt_ic = ic;
1840 	IEEE80211_NODE_LOCK_INIT(nt, ifp->if_xname);
1841 	IEEE80211_NODE_ITERATE_LOCK_INIT(nt, ifp->if_xname);
1842 	TAILQ_INIT(&nt->nt_node);
1843 	nt->nt_name = name;
1844 	nt->nt_scangen = 1;
1845 	nt->nt_inact_init = inact;
1846 	nt->nt_keyixmax = keyixmax;
1847 	if (nt->nt_keyixmax > 0) {
1848 		nt->nt_keyixmap = (struct ieee80211_node **) malloc(
1849 			keyixmax * sizeof(struct ieee80211_node *),
1850 			M_80211_NODE, M_NOWAIT | M_ZERO);
1851 		if (nt->nt_keyixmap == NULL)
1852 			if_printf(ic->ic_ifp,
1853 			    "Cannot allocate key index map with %u entries\n",
1854 			    keyixmax);
1855 	} else
1856 		nt->nt_keyixmap = NULL;
1857 }
1858 
1859 static void
1860 ieee80211_node_table_reset(struct ieee80211_node_table *nt,
1861 	struct ieee80211vap *match)
1862 {
1863 	struct ieee80211_node *ni, *next;
1864 
1865 	IEEE80211_NODE_LOCK(nt);
1866 	TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
1867 		if (match != NULL && ni->ni_vap != match)
1868 			continue;
1869 		/* XXX can this happen?  if so need's work */
1870 		if (ni->ni_associd != 0) {
1871 			struct ieee80211vap *vap = ni->ni_vap;
1872 
1873 			if (vap->iv_auth->ia_node_leave != NULL)
1874 				vap->iv_auth->ia_node_leave(ni);
1875 			if (vap->iv_aid_bitmap != NULL)
1876 				IEEE80211_AID_CLR(vap, ni->ni_associd);
1877 		}
1878 		ni->ni_wdsvap = NULL;		/* clear reference */
1879 		node_reclaim(nt, ni);
1880 	}
1881 	if (match != NULL && match->iv_opmode == IEEE80211_M_WDS) {
1882 		/*
1883 		 * Make a separate pass to clear references to this vap
1884 		 * held by DWDS entries.  They will not be matched above
1885 		 * because ni_vap will point to the ap vap but we still
1886 		 * need to clear ni_wdsvap when the WDS vap is destroyed
1887 		 * and/or reset.
1888 		 */
1889 		TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next)
1890 			if (ni->ni_wdsvap == match)
1891 				ni->ni_wdsvap = NULL;
1892 	}
1893 	IEEE80211_NODE_UNLOCK(nt);
1894 }
1895 
1896 static void
1897 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
1898 {
1899 	ieee80211_node_table_reset(nt, NULL);
1900 	if (nt->nt_keyixmap != NULL) {
1901 #ifdef DIAGNOSTIC
1902 		/* XXX verify all entries are NULL */
1903 		int i;
1904 		for (i = 0; i < nt->nt_keyixmax; i++)
1905 			if (nt->nt_keyixmap[i] != NULL)
1906 				printf("%s: %s[%u] still active\n", __func__,
1907 					nt->nt_name, i);
1908 #endif
1909 		free(nt->nt_keyixmap, M_80211_NODE);
1910 		nt->nt_keyixmap = NULL;
1911 	}
1912 	IEEE80211_NODE_ITERATE_LOCK_DESTROY(nt);
1913 	IEEE80211_NODE_LOCK_DESTROY(nt);
1914 }
1915 
1916 /*
1917  * Timeout inactive stations and do related housekeeping.
1918  * Note that we cannot hold the node lock while sending a
1919  * frame as this would lead to a LOR.  Instead we use a
1920  * generation number to mark nodes that we've scanned and
1921  * drop the lock and restart a scan if we have to time out
1922  * a node.  Since we are single-threaded by virtue of
1923  * controlling the inactivity timer we can be sure this will
1924  * process each node only once.
1925  */
1926 static void
1927 ieee80211_timeout_stations(struct ieee80211com *ic)
1928 {
1929 	struct ieee80211_node_table *nt = &ic->ic_sta;
1930 	struct ieee80211vap *vap;
1931 	struct ieee80211_node *ni;
1932 	int gen = 0;
1933 
1934 	IEEE80211_NODE_ITERATE_LOCK(nt);
1935 	gen = ++nt->nt_scangen;
1936 restart:
1937 	IEEE80211_NODE_LOCK(nt);
1938 	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
1939 		if (ni->ni_scangen == gen)	/* previously handled */
1940 			continue;
1941 		ni->ni_scangen = gen;
1942 		/*
1943 		 * Ignore entries for which have yet to receive an
1944 		 * authentication frame.  These are transient and
1945 		 * will be reclaimed when the last reference to them
1946 		 * goes away (when frame xmits complete).
1947 		 */
1948 		vap = ni->ni_vap;
1949 		/*
1950 		 * Only process stations when in RUN state.  This
1951 		 * insures, for example, that we don't timeout an
1952 		 * inactive station during CAC.  Note that CSA state
1953 		 * is actually handled in ieee80211_node_timeout as
1954 		 * it applies to more than timeout processing.
1955 		 */
1956 		if (vap->iv_state != IEEE80211_S_RUN)
1957 			continue;
1958 		/* XXX can vap be NULL? */
1959 		if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
1960 		     vap->iv_opmode == IEEE80211_M_STA) &&
1961 		    (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1962 			continue;
1963 		/*
1964 		 * Free fragment if not needed anymore
1965 		 * (last fragment older than 1s).
1966 		 * XXX doesn't belong here, move to node_age
1967 		 */
1968 		if (ni->ni_rxfrag[0] != NULL &&
1969 		    ticks > ni->ni_rxfragstamp + hz) {
1970 			m_freem(ni->ni_rxfrag[0]);
1971 			ni->ni_rxfrag[0] = NULL;
1972 		}
1973 		if (ni->ni_inact > 0) {
1974 			ni->ni_inact--;
1975 			IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
1976 			    "%s: inact %u inact_reload %u nrates %u",
1977 			    __func__, ni->ni_inact, ni->ni_inact_reload,
1978 			    ni->ni_rates.rs_nrates);
1979 		}
1980 		/*
1981 		 * Special case ourself; we may be idle for extended periods
1982 		 * of time and regardless reclaiming our state is wrong.
1983 		 * XXX run ic_node_age
1984 		 */
1985 		if (ni == vap->iv_bss)
1986 			continue;
1987 		if (ni->ni_associd != 0 ||
1988 		    (vap->iv_opmode == IEEE80211_M_IBSS ||
1989 		     vap->iv_opmode == IEEE80211_M_AHDEMO)) {
1990 			/*
1991 			 * Age/drain resources held by the station.
1992 			 */
1993 			ic->ic_node_age(ni);
1994 			/*
1995 			 * Probe the station before time it out.  We
1996 			 * send a null data frame which may not be
1997 			 * universally supported by drivers (need it
1998 			 * for ps-poll support so it should be...).
1999 			 *
2000 			 * XXX don't probe the station unless we've
2001 			 *     received a frame from them (and have
2002 			 *     some idea of the rates they are capable
2003 			 *     of); this will get fixed more properly
2004 			 *     soon with better handling of the rate set.
2005 			 */
2006 			if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
2007 			    (0 < ni->ni_inact &&
2008 			     ni->ni_inact <= vap->iv_inact_probe) &&
2009 			    ni->ni_rates.rs_nrates != 0) {
2010 				IEEE80211_NOTE(vap,
2011 				    IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
2012 				    ni, "%s",
2013 				    "probe station due to inactivity");
2014 				/*
2015 				 * Grab a reference before unlocking the table
2016 				 * so the node cannot be reclaimed before we
2017 				 * send the frame. ieee80211_send_nulldata
2018 				 * understands we've done this and reclaims the
2019 				 * ref for us as needed.
2020 				 */
2021 				ieee80211_ref_node(ni);
2022 				IEEE80211_NODE_UNLOCK(nt);
2023 				ieee80211_send_nulldata(ni);
2024 				/* XXX stat? */
2025 				goto restart;
2026 			}
2027 		}
2028 		if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
2029 		    ni->ni_inact <= 0) {
2030 			IEEE80211_NOTE(vap,
2031 			    IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
2032 			    "station timed out due to inactivity "
2033 			    "(refcnt %u)", ieee80211_node_refcnt(ni));
2034 			/*
2035 			 * Send a deauthenticate frame and drop the station.
2036 			 * This is somewhat complicated due to reference counts
2037 			 * and locking.  At this point a station will typically
2038 			 * have a reference count of 1.  ieee80211_node_leave
2039 			 * will do a "free" of the node which will drop the
2040 			 * reference count.  But in the meantime a reference
2041 			 * wil be held by the deauth frame.  The actual reclaim
2042 			 * of the node will happen either after the tx is
2043 			 * completed or by ieee80211_node_leave.
2044 			 *
2045 			 * Separately we must drop the node lock before sending
2046 			 * in case the driver takes a lock, as this can result
2047 			 * in a LOR between the node lock and the driver lock.
2048 			 */
2049 			ieee80211_ref_node(ni);
2050 			IEEE80211_NODE_UNLOCK(nt);
2051 			if (ni->ni_associd != 0) {
2052 				IEEE80211_SEND_MGMT(ni,
2053 				    IEEE80211_FC0_SUBTYPE_DEAUTH,
2054 				    IEEE80211_REASON_AUTH_EXPIRE);
2055 			}
2056 			ieee80211_node_leave(ni);
2057 			ieee80211_free_node(ni);
2058 			vap->iv_stats.is_node_timeout++;
2059 			goto restart;
2060 		}
2061 	}
2062 	IEEE80211_NODE_UNLOCK(nt);
2063 
2064 	IEEE80211_NODE_ITERATE_UNLOCK(nt);
2065 }
2066 
2067 /*
2068  * Aggressively reclaim resources.  This should be used
2069  * only in a critical situation to reclaim mbuf resources.
2070  */
2071 void
2072 ieee80211_drain(struct ieee80211com *ic)
2073 {
2074 	struct ieee80211_node_table *nt = &ic->ic_sta;
2075 	struct ieee80211vap *vap;
2076 	struct ieee80211_node *ni;
2077 
2078 	IEEE80211_NODE_LOCK(nt);
2079 	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
2080 		/*
2081 		 * Ignore entries for which have yet to receive an
2082 		 * authentication frame.  These are transient and
2083 		 * will be reclaimed when the last reference to them
2084 		 * goes away (when frame xmits complete).
2085 		 */
2086 		vap = ni->ni_vap;
2087 		/*
2088 		 * Only process stations when in RUN state.  This
2089 		 * insures, for example, that we don't timeout an
2090 		 * inactive station during CAC.  Note that CSA state
2091 		 * is actually handled in ieee80211_node_timeout as
2092 		 * it applies to more than timeout processing.
2093 		 */
2094 		if (vap->iv_state != IEEE80211_S_RUN)
2095 			continue;
2096 		/* XXX can vap be NULL? */
2097 		if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
2098 		     vap->iv_opmode == IEEE80211_M_STA) &&
2099 		    (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
2100 			continue;
2101 		/*
2102 		 * Free fragments.
2103 		 * XXX doesn't belong here, move to node_drain
2104 		 */
2105 		if (ni->ni_rxfrag[0] != NULL) {
2106 			m_freem(ni->ni_rxfrag[0]);
2107 			ni->ni_rxfrag[0] = NULL;
2108 		}
2109 		/*
2110 		 * Drain resources held by the station.
2111 		 */
2112 		ic->ic_node_drain(ni);
2113 	}
2114 	IEEE80211_NODE_UNLOCK(nt);
2115 }
2116 
2117 /*
2118  * Per-ieee80211com inactivity timer callback.
2119  */
2120 void
2121 ieee80211_node_timeout(void *arg)
2122 {
2123 	struct ieee80211com *ic = arg;
2124 
2125 	/*
2126 	 * Defer timeout processing if a channel switch is pending.
2127 	 * We typically need to be mute so not doing things that
2128 	 * might generate frames is good to handle in one place.
2129 	 * Supressing the station timeout processing may extend the
2130 	 * lifetime of inactive stations (by not decrementing their
2131 	 * idle counters) but this should be ok unless the CSA is
2132 	 * active for an unusually long time.
2133 	 */
2134 	if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
2135 		ieee80211_scan_timeout(ic);
2136 		ieee80211_timeout_stations(ic);
2137 		ieee80211_ageq_age(&ic->ic_stageq, IEEE80211_INACT_WAIT);
2138 
2139 		IEEE80211_LOCK(ic);
2140 		ieee80211_erp_timeout(ic);
2141 		ieee80211_ht_timeout(ic);
2142 		IEEE80211_UNLOCK(ic);
2143 	}
2144 	callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
2145 		ieee80211_node_timeout, ic);
2146 }
2147 
2148 void
2149 ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
2150 	ieee80211_iter_func *f, void *arg)
2151 {
2152 	struct ieee80211_node *ni;
2153 	u_int gen;
2154 
2155 	IEEE80211_NODE_ITERATE_LOCK(nt);
2156 	gen = ++nt->nt_scangen;
2157 restart:
2158 	IEEE80211_NODE_LOCK(nt);
2159 	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
2160 		if (ni->ni_scangen != gen) {
2161 			ni->ni_scangen = gen;
2162 			(void) ieee80211_ref_node(ni);
2163 			IEEE80211_NODE_UNLOCK(nt);
2164 			(*f)(arg, ni);
2165 			ieee80211_free_node(ni);
2166 			goto restart;
2167 		}
2168 	}
2169 	IEEE80211_NODE_UNLOCK(nt);
2170 
2171 	IEEE80211_NODE_ITERATE_UNLOCK(nt);
2172 }
2173 
2174 void
2175 ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
2176 {
2177 	printf("0x%p: mac %s refcnt %d\n", ni,
2178 		ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
2179 	printf("\tscangen %u authmode %u flags 0x%x\n",
2180 		ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
2181 	printf("\tassocid 0x%x txpower %u vlan %u\n",
2182 		ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
2183 	printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
2184 		ni->ni_txseqs[IEEE80211_NONQOS_TID],
2185 		ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
2186 		ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
2187 		ni->ni_rxfragstamp);
2188 	printf("\trssi %d noise %d intval %u capinfo 0x%x\n",
2189 		node_getrssi(ni), ni->ni_noise,
2190 		ni->ni_intval, ni->ni_capinfo);
2191 	printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
2192 		ether_sprintf(ni->ni_bssid),
2193 		ni->ni_esslen, ni->ni_essid,
2194 		ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
2195 	printf("\tinact %u inact_reload %u txrate %u\n",
2196 		ni->ni_inact, ni->ni_inact_reload, ni->ni_txrate);
2197 	printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
2198 		ni->ni_htcap, ni->ni_htparam,
2199 		ni->ni_htctlchan, ni->ni_ht2ndchan);
2200 	printf("\thtopmode %x htstbc %x chw %u\n",
2201 		ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
2202 }
2203 
2204 void
2205 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
2206 {
2207 	ieee80211_iterate_nodes(nt,
2208 		(ieee80211_iter_func *) ieee80211_dump_node, nt);
2209 }
2210 
2211 static void
2212 ieee80211_notify_erp_locked(struct ieee80211com *ic)
2213 {
2214 	struct ieee80211vap *vap;
2215 
2216 	IEEE80211_LOCK_ASSERT(ic);
2217 
2218 	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
2219 		if (vap->iv_opmode == IEEE80211_M_HOSTAP)
2220 			ieee80211_beacon_notify(vap, IEEE80211_BEACON_ERP);
2221 }
2222 
2223 void
2224 ieee80211_notify_erp(struct ieee80211com *ic)
2225 {
2226 	IEEE80211_LOCK(ic);
2227 	ieee80211_notify_erp_locked(ic);
2228 	IEEE80211_UNLOCK(ic);
2229 }
2230 
2231 /*
2232  * Handle a station joining an 11g network.
2233  */
2234 static void
2235 ieee80211_node_join_11g(struct ieee80211_node *ni)
2236 {
2237 	struct ieee80211com *ic = ni->ni_ic;
2238 
2239 	IEEE80211_LOCK_ASSERT(ic);
2240 
2241 	/*
2242 	 * Station isn't capable of short slot time.  Bump
2243 	 * the count of long slot time stations and disable
2244 	 * use of short slot time.  Note that the actual switch
2245 	 * over to long slot time use may not occur until the
2246 	 * next beacon transmission (per sec. 7.3.1.4 of 11g).
2247 	 */
2248 	if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
2249 		ic->ic_longslotsta++;
2250 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2251 		    "station needs long slot time, count %d",
2252 		    ic->ic_longslotsta);
2253 		/* XXX vap's w/ conflicting needs won't work */
2254 		if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
2255 			/*
2256 			 * Don't force slot time when switched to turbo
2257 			 * mode as non-ERP stations won't be present; this
2258 			 * need only be done when on the normal G channel.
2259 			 */
2260 			ieee80211_set_shortslottime(ic, 0);
2261 		}
2262 	}
2263 	/*
2264 	 * If the new station is not an ERP station
2265 	 * then bump the counter and enable protection
2266 	 * if configured.
2267 	 */
2268 	if (!ieee80211_iserp_rateset(&ni->ni_rates)) {
2269 		ic->ic_nonerpsta++;
2270 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2271 		    "station is !ERP, %d non-ERP stations associated",
2272 		    ic->ic_nonerpsta);
2273 		/*
2274 		 * If station does not support short preamble
2275 		 * then we must enable use of Barker preamble.
2276 		 */
2277 		if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
2278 			IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2279 			    "%s", "station needs long preamble");
2280 			ic->ic_flags |= IEEE80211_F_USEBARKER;
2281 			ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
2282 		}
2283 		/*
2284 		 * If protection is configured and this is the first
2285 		 * indication we should use protection, enable it.
2286 		 */
2287 		if (ic->ic_protmode != IEEE80211_PROT_NONE &&
2288 		    ic->ic_nonerpsta == 1 &&
2289 		    (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
2290 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
2291 			    "%s: enable use of protection\n", __func__);
2292 			ic->ic_flags |= IEEE80211_F_USEPROT;
2293 			ieee80211_notify_erp_locked(ic);
2294 		}
2295 	} else
2296 		ni->ni_flags |= IEEE80211_NODE_ERP;
2297 }
2298 
2299 void
2300 ieee80211_node_join(struct ieee80211_node *ni, int resp)
2301 {
2302 	struct ieee80211com *ic = ni->ni_ic;
2303 	struct ieee80211vap *vap = ni->ni_vap;
2304 	int newassoc;
2305 
2306 	if (ni->ni_associd == 0) {
2307 		uint16_t aid;
2308 
2309 		KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
2310 		/*
2311 		 * It would be good to search the bitmap
2312 		 * more efficiently, but this will do for now.
2313 		 */
2314 		for (aid = 1; aid < vap->iv_max_aid; aid++) {
2315 			if (!IEEE80211_AID_ISSET(vap, aid))
2316 				break;
2317 		}
2318 		if (aid >= vap->iv_max_aid) {
2319 			IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_TOOMANY);
2320 			ieee80211_node_leave(ni);
2321 			return;
2322 		}
2323 		ni->ni_associd = aid | 0xc000;
2324 		ni->ni_jointime = time_uptime;
2325 		IEEE80211_LOCK(ic);
2326 		IEEE80211_AID_SET(vap, ni->ni_associd);
2327 		vap->iv_sta_assoc++;
2328 		ic->ic_sta_assoc++;
2329 
2330 		if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
2331 			ieee80211_ht_node_join(ni);
2332 		if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2333 		    IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
2334 			ieee80211_node_join_11g(ni);
2335 		IEEE80211_UNLOCK(ic);
2336 
2337 		newassoc = 1;
2338 	} else
2339 		newassoc = 0;
2340 
2341 	IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
2342 	    "station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
2343 	    IEEE80211_NODE_AID(ni),
2344 	    ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
2345 	    ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
2346 	    ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
2347 	    ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
2348 	    ni->ni_flags & IEEE80211_NODE_HT ?
2349 		(ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
2350 	    ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
2351 	    ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
2352 	        ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
2353 	    ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
2354 	    IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
2355 		", fast-frames" : "",
2356 	    IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
2357 		", turbo" : ""
2358 	);
2359 
2360 	ieee80211_node_setuptxparms(ni);
2361 	ieee80211_ratectl_node_init(ni);
2362 	/* give driver a chance to setup state like ni_txrate */
2363 	if (ic->ic_newassoc != NULL)
2364 		ic->ic_newassoc(ni, newassoc);
2365 	IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
2366 	/* tell the authenticator about new station */
2367 	if (vap->iv_auth->ia_node_join != NULL)
2368 		vap->iv_auth->ia_node_join(ni);
2369 	ieee80211_notify_node_join(ni,
2370 	    resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
2371 }
2372 
2373 static void
2374 disable_protection(struct ieee80211com *ic)
2375 {
2376 	KASSERT(ic->ic_nonerpsta == 0 &&
2377 	    (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
2378 	   ("%d non ERP stations, flags 0x%x", ic->ic_nonerpsta,
2379 	   ic->ic_flags_ext));
2380 
2381 	ic->ic_flags &= ~IEEE80211_F_USEPROT;
2382 	/* XXX verify mode? */
2383 	if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
2384 		ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
2385 		ic->ic_flags &= ~IEEE80211_F_USEBARKER;
2386 	}
2387 	ieee80211_notify_erp_locked(ic);
2388 }
2389 
2390 /*
2391  * Handle a station leaving an 11g network.
2392  */
2393 static void
2394 ieee80211_node_leave_11g(struct ieee80211_node *ni)
2395 {
2396 	struct ieee80211com *ic = ni->ni_ic;
2397 
2398 	IEEE80211_LOCK_ASSERT(ic);
2399 
2400 	KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
2401 	     ("not in 11g, bss %u:0x%x", ic->ic_bsschan->ic_freq,
2402 	      ic->ic_bsschan->ic_flags));
2403 
2404 	/*
2405 	 * If a long slot station do the slot time bookkeeping.
2406 	 */
2407 	if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
2408 		KASSERT(ic->ic_longslotsta > 0,
2409 		    ("bogus long slot station count %d", ic->ic_longslotsta));
2410 		ic->ic_longslotsta--;
2411 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2412 		    "long slot time station leaves, count now %d",
2413 		    ic->ic_longslotsta);
2414 		if (ic->ic_longslotsta == 0) {
2415 			/*
2416 			 * Re-enable use of short slot time if supported
2417 			 * and not operating in IBSS mode (per spec).
2418 			 */
2419 			if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
2420 			    ic->ic_opmode != IEEE80211_M_IBSS) {
2421 				IEEE80211_DPRINTF(ni->ni_vap,
2422 				    IEEE80211_MSG_ASSOC,
2423 				    "%s: re-enable use of short slot time\n",
2424 				    __func__);
2425 				ieee80211_set_shortslottime(ic, 1);
2426 			}
2427 		}
2428 	}
2429 	/*
2430 	 * If a non-ERP station do the protection-related bookkeeping.
2431 	 */
2432 	if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
2433 		KASSERT(ic->ic_nonerpsta > 0,
2434 		    ("bogus non-ERP station count %d", ic->ic_nonerpsta));
2435 		ic->ic_nonerpsta--;
2436 		IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
2437 		    "non-ERP station leaves, count now %d%s", ic->ic_nonerpsta,
2438 		    (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
2439 			" (non-ERP sta present)" : "");
2440 		if (ic->ic_nonerpsta == 0 &&
2441 		    (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
2442 			IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
2443 				"%s: disable use of protection\n", __func__);
2444 			disable_protection(ic);
2445 		}
2446 	}
2447 }
2448 
2449 /*
2450  * Time out presence of an overlapping bss with non-ERP
2451  * stations.  When operating in hostap mode we listen for
2452  * beacons from other stations and if we identify a non-ERP
2453  * station is present we enable protection.  To identify
2454  * when all non-ERP stations are gone we time out this
2455  * condition.
2456  */
2457 static void
2458 ieee80211_erp_timeout(struct ieee80211com *ic)
2459 {
2460 
2461 	IEEE80211_LOCK_ASSERT(ic);
2462 
2463 	if ((ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
2464 	    time_after(ticks, ic->ic_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
2465 #if 0
2466 		IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2467 		    "%s", "age out non-ERP sta present on channel");
2468 #endif
2469 		ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
2470 		if (ic->ic_nonerpsta == 0)
2471 			disable_protection(ic);
2472 	}
2473 }
2474 
2475 /*
2476  * Handle bookkeeping for station deauthentication/disassociation
2477  * when operating as an ap.
2478  */
2479 void
2480 ieee80211_node_leave(struct ieee80211_node *ni)
2481 {
2482 	struct ieee80211com *ic = ni->ni_ic;
2483 	struct ieee80211vap *vap = ni->ni_vap;
2484 	struct ieee80211_node_table *nt = ni->ni_table;
2485 
2486 	IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
2487 	    "station with aid %d leaves", IEEE80211_NODE_AID(ni));
2488 
2489 	KASSERT(vap->iv_opmode != IEEE80211_M_STA,
2490 		("unexpected operating mode %u", vap->iv_opmode));
2491 	/*
2492 	 * If node wasn't previously associated all
2493 	 * we need to do is reclaim the reference.
2494 	 */
2495 	/* XXX ibss mode bypasses 11g and notification */
2496 	if (ni->ni_associd == 0)
2497 		goto done;
2498 	/*
2499 	 * Tell the authenticator the station is leaving.
2500 	 * Note that we must do this before yanking the
2501 	 * association id as the authenticator uses the
2502 	 * associd to locate it's state block.
2503 	 */
2504 	if (vap->iv_auth->ia_node_leave != NULL)
2505 		vap->iv_auth->ia_node_leave(ni);
2506 
2507 	IEEE80211_LOCK(ic);
2508 	IEEE80211_AID_CLR(vap, ni->ni_associd);
2509 	ni->ni_associd = 0;
2510 	vap->iv_sta_assoc--;
2511 	ic->ic_sta_assoc--;
2512 
2513 	if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
2514 		ieee80211_ht_node_leave(ni);
2515 	if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2516 	    IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
2517 		ieee80211_node_leave_11g(ni);
2518 	IEEE80211_UNLOCK(ic);
2519 	/*
2520 	 * Cleanup station state.  In particular clear various
2521 	 * state that might otherwise be reused if the node
2522 	 * is reused before the reference count goes to zero
2523 	 * (and memory is reclaimed).
2524 	 */
2525 	ieee80211_sta_leave(ni);
2526 done:
2527 	/*
2528 	 * Remove the node from any table it's recorded in and
2529 	 * drop the caller's reference.  Removal from the table
2530 	 * is important to insure the node is not reprocessed
2531 	 * for inactivity.
2532 	 */
2533 	if (nt != NULL) {
2534 		IEEE80211_NODE_LOCK(nt);
2535 		node_reclaim(nt, ni);
2536 		IEEE80211_NODE_UNLOCK(nt);
2537 	} else
2538 		ieee80211_free_node(ni);
2539 }
2540 
2541 struct rssiinfo {
2542 	struct ieee80211vap *vap;
2543 	int	rssi_samples;
2544 	uint32_t rssi_total;
2545 };
2546 
2547 static void
2548 get_hostap_rssi(void *arg, struct ieee80211_node *ni)
2549 {
2550 	struct rssiinfo *info = arg;
2551 	struct ieee80211vap *vap = ni->ni_vap;
2552 	int8_t rssi;
2553 
2554 	if (info->vap != vap)
2555 		return;
2556 	/* only associated stations */
2557 	if (ni->ni_associd == 0)
2558 		return;
2559 	rssi = vap->iv_ic->ic_node_getrssi(ni);
2560 	if (rssi != 0) {
2561 		info->rssi_samples++;
2562 		info->rssi_total += rssi;
2563 	}
2564 }
2565 
2566 static void
2567 get_adhoc_rssi(void *arg, struct ieee80211_node *ni)
2568 {
2569 	struct rssiinfo *info = arg;
2570 	struct ieee80211vap *vap = ni->ni_vap;
2571 	int8_t rssi;
2572 
2573 	if (info->vap != vap)
2574 		return;
2575 	/* only neighbors */
2576 	/* XXX check bssid */
2577 	if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
2578 		return;
2579 	rssi = vap->iv_ic->ic_node_getrssi(ni);
2580 	if (rssi != 0) {
2581 		info->rssi_samples++;
2582 		info->rssi_total += rssi;
2583 	}
2584 }
2585 
2586 #ifdef IEEE80211_SUPPORT_MESH
2587 static void
2588 get_mesh_rssi(void *arg, struct ieee80211_node *ni)
2589 {
2590 	struct rssiinfo *info = arg;
2591 	struct ieee80211vap *vap = ni->ni_vap;
2592 	int8_t rssi;
2593 
2594 	if (info->vap != vap)
2595 		return;
2596 	/* only neighbors that peered successfully */
2597 	if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
2598 		return;
2599 	rssi = vap->iv_ic->ic_node_getrssi(ni);
2600 	if (rssi != 0) {
2601 		info->rssi_samples++;
2602 		info->rssi_total += rssi;
2603 	}
2604 }
2605 #endif /* IEEE80211_SUPPORT_MESH */
2606 
2607 int8_t
2608 ieee80211_getrssi(struct ieee80211vap *vap)
2609 {
2610 #define	NZ(x)	((x) == 0 ? 1 : (x))
2611 	struct ieee80211com *ic = vap->iv_ic;
2612 	struct rssiinfo info;
2613 
2614 	info.rssi_total = 0;
2615 	info.rssi_samples = 0;
2616 	info.vap = vap;
2617 	switch (vap->iv_opmode) {
2618 	case IEEE80211_M_IBSS:		/* average of all ibss neighbors */
2619 	case IEEE80211_M_AHDEMO:	/* average of all neighbors */
2620 		ieee80211_iterate_nodes(&ic->ic_sta, get_adhoc_rssi, &info);
2621 		break;
2622 	case IEEE80211_M_HOSTAP:	/* average of all associated stations */
2623 		ieee80211_iterate_nodes(&ic->ic_sta, get_hostap_rssi, &info);
2624 		break;
2625 #ifdef IEEE80211_SUPPORT_MESH
2626 	case IEEE80211_M_MBSS:		/* average of all mesh neighbors */
2627 		ieee80211_iterate_nodes(&ic->ic_sta, get_mesh_rssi, &info);
2628 		break;
2629 #endif
2630 	case IEEE80211_M_MONITOR:	/* XXX */
2631 	case IEEE80211_M_STA:		/* use stats from associated ap */
2632 	default:
2633 		if (vap->iv_bss != NULL)
2634 			info.rssi_total = ic->ic_node_getrssi(vap->iv_bss);
2635 		info.rssi_samples = 1;
2636 		break;
2637 	}
2638 	return info.rssi_total / NZ(info.rssi_samples);
2639 #undef NZ
2640 }
2641 
2642 void
2643 ieee80211_getsignal(struct ieee80211vap *vap, int8_t *rssi, int8_t *noise)
2644 {
2645 
2646 	if (vap->iv_bss == NULL)		/* NB: shouldn't happen */
2647 		return;
2648 	vap->iv_ic->ic_node_getsignal(vap->iv_bss, rssi, noise);
2649 	/* for non-station mode return avg'd rssi accounting */
2650 	if (vap->iv_opmode != IEEE80211_M_STA)
2651 		*rssi = ieee80211_getrssi(vap);
2652 }
2653