1 /* $NetBSD: ieee80211_node.c,v 1.71 2016/04/08 14:30:47 roy Exp $ */
2 /*-
3 * Copyright (c) 2001 Atsushi Onoe
4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 #ifdef __FreeBSD__
36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_node.c,v 1.65 2005/08/13 17:50:21 sam Exp $");
37 #endif
38 #ifdef __NetBSD__
39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.71 2016/04/08 14:30:47 roy Exp $");
40 #endif
41
42 #ifdef _KERNEL_OPT
43 #include "opt_inet.h"
44 #endif
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/mbuf.h>
49 #include <sys/malloc.h>
50 #include <sys/kernel.h>
51
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/endian.h>
55 #include <sys/errno.h>
56 #include <sys/proc.h>
57 #include <sys/sysctl.h>
58
59 #include <net/if.h>
60 #include <net/if_media.h>
61 #include <net/if_arp.h>
62 #include <net/if_ether.h>
63 #include <net/if_llc.h>
64
65 #include <net80211/ieee80211_netbsd.h>
66 #include <net80211/ieee80211_var.h>
67
68 #include <net/bpf.h>
69
70 #ifdef INET
71 #include <netinet/in.h>
72 #include <net/if_ether.h>
73 #endif
74
75 /*
76 * Association id's are managed with a bit vector.
77 */
78 #define IEEE80211_AID_SET(b, w) \
79 ((w)[IEEE80211_AID(b) / 32] |= (1 << (IEEE80211_AID(b) % 32)))
80 #define IEEE80211_AID_CLR(b, w) \
81 ((w)[IEEE80211_AID(b) / 32] &= ~(1 << (IEEE80211_AID(b) % 32)))
82 #define IEEE80211_AID_ISSET(b, w) \
83 ((w)[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))
84
85 static struct ieee80211_node *node_alloc(struct ieee80211_node_table *);
86 static void node_cleanup(struct ieee80211_node *);
87 static void node_free(struct ieee80211_node *);
88 static u_int8_t node_getrssi(const struct ieee80211_node *);
89
90 static void ieee80211_setup_node(struct ieee80211_node_table *,
91 struct ieee80211_node *, const u_int8_t *);
92 static void _ieee80211_free_node(struct ieee80211_node *);
93 static void ieee80211_free_allnodes(struct ieee80211_node_table *);
94
95 static void ieee80211_timeout_scan_candidates(struct ieee80211_node_table *);
96 static void ieee80211_timeout_stations(struct ieee80211_node_table *);
97
98 static void ieee80211_set_tim(struct ieee80211_node *, int set);
99
100 static void ieee80211_node_table_init(struct ieee80211com *ic,
101 struct ieee80211_node_table *nt, const char *name,
102 int inact, int keyixmax,
103 void (*timeout)(struct ieee80211_node_table *));
104 static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
105
106 MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
107
108 void
ieee80211_node_attach(struct ieee80211com * ic)109 ieee80211_node_attach(struct ieee80211com *ic)
110 {
111
112 ic->ic_node_alloc = node_alloc;
113 ic->ic_node_free = node_free;
114 ic->ic_node_cleanup = node_cleanup;
115 ic->ic_node_getrssi = node_getrssi;
116
117 /* default station inactivity timer setings */
118 ic->ic_inact_init = IEEE80211_INACT_INIT;
119 ic->ic_inact_auth = IEEE80211_INACT_AUTH;
120 ic->ic_inact_run = IEEE80211_INACT_RUN;
121 ic->ic_inact_probe = IEEE80211_INACT_PROBE;
122
123 /* NB: driver should override */
124 ic->ic_max_aid = IEEE80211_AID_DEF;
125 ic->ic_set_tim = ieee80211_set_tim;
126 }
127
128 void
ieee80211_node_lateattach(struct ieee80211com * ic)129 ieee80211_node_lateattach(struct ieee80211com *ic)
130 {
131 struct ieee80211_rsnparms *rsn;
132
133 if (ic->ic_max_aid > IEEE80211_AID_MAX)
134 ic->ic_max_aid = IEEE80211_AID_MAX;
135 ic->ic_aid_bitmap = malloc(howmany(ic->ic_max_aid, 32) *
136 sizeof(u_int32_t), M_DEVBUF, M_NOWAIT | M_ZERO);
137 if (ic->ic_aid_bitmap == NULL) {
138 /* XXX no way to recover */
139 printf("%s: no memory for AID bitmap!\n", __func__);
140 ic->ic_max_aid = 0;
141 }
142
143 /* XXX defer until using hostap/ibss mode */
144 ic->ic_tim_len = howmany(ic->ic_max_aid, 8) * sizeof(u_int8_t);
145 ic->ic_tim_bitmap = malloc(ic->ic_tim_len, M_DEVBUF, M_NOWAIT | M_ZERO);
146 if (ic->ic_tim_bitmap == NULL) {
147 /* XXX no way to recover */
148 printf("%s: no memory for TIM bitmap!\n", __func__);
149 }
150
151 ieee80211_node_table_init(ic, &ic->ic_sta, "station",
152 IEEE80211_INACT_INIT, ic->ic_crypto.cs_max_keyix,
153 ieee80211_timeout_stations);
154 ieee80211_node_table_init(ic, &ic->ic_scan, "scan",
155 IEEE80211_INACT_SCAN, 0,
156 ieee80211_timeout_scan_candidates);
157
158 ieee80211_reset_bss(ic);
159 /*
160 * Setup "global settings" in the bss node so that
161 * each new station automatically inherits them.
162 */
163 rsn = &ic->ic_bss->ni_rsn;
164 /* WEP, TKIP, and AES-CCM are always supported */
165 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_WEP;
166 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_TKIP;
167 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_CCM;
168 if (ic->ic_caps & IEEE80211_C_AES)
169 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_OCB;
170 if (ic->ic_caps & IEEE80211_C_CKIP)
171 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_CKIP;
172 /*
173 * Default unicast cipher to WEP for 802.1x use. If
174 * WPA is enabled the management code will set these
175 * values to reflect.
176 */
177 rsn->rsn_ucastcipher = IEEE80211_CIPHER_WEP;
178 rsn->rsn_ucastkeylen = 104 / NBBY;
179 /*
180 * WPA says the multicast cipher is the lowest unicast
181 * cipher supported. But we skip WEP which would
182 * otherwise be used based on this criteria.
183 */
184 rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP;
185 rsn->rsn_mcastkeylen = 128 / NBBY;
186
187 /*
188 * We support both WPA-PSK and 802.1x; the one used
189 * is determined by the authentication mode and the
190 * setting of the PSK state.
191 */
192 rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK;
193 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
194
195 ic->ic_auth = ieee80211_authenticator_get(ic->ic_bss->ni_authmode);
196 }
197
198 void
ieee80211_node_detach(struct ieee80211com * ic)199 ieee80211_node_detach(struct ieee80211com *ic)
200 {
201
202 if (ic->ic_bss != NULL) {
203 ieee80211_free_node(ic->ic_bss);
204 ic->ic_bss = NULL;
205 }
206 ieee80211_node_table_cleanup(&ic->ic_scan);
207 ieee80211_node_table_cleanup(&ic->ic_sta);
208 if (ic->ic_aid_bitmap != NULL) {
209 free(ic->ic_aid_bitmap, M_DEVBUF);
210 ic->ic_aid_bitmap = NULL;
211 }
212 if (ic->ic_tim_bitmap != NULL) {
213 free(ic->ic_tim_bitmap, M_DEVBUF);
214 ic->ic_tim_bitmap = NULL;
215 }
216 }
217
218 /*
219 * Port authorize/unauthorize interfaces for use by an authenticator.
220 */
221
222 void
ieee80211_node_authorize(struct ieee80211_node * ni)223 ieee80211_node_authorize(struct ieee80211_node *ni)
224 {
225 struct ieee80211com *ic = ni->ni_ic;
226
227 ni->ni_flags |= IEEE80211_NODE_AUTH;
228 ni->ni_inact_reload = ic->ic_inact_run;
229 }
230
231 void
ieee80211_node_unauthorize(struct ieee80211_node * ni)232 ieee80211_node_unauthorize(struct ieee80211_node *ni)
233 {
234 ni->ni_flags &= ~IEEE80211_NODE_AUTH;
235 }
236
237 /*
238 * Set/change the channel. The rate set is also updated as
239 * to insure a consistent view by drivers.
240 */
241 static void
ieee80211_set_chan(struct ieee80211com * ic,struct ieee80211_node * ni,struct ieee80211_channel * chan)242 ieee80211_set_chan(struct ieee80211com *ic,
243 struct ieee80211_node *ni, struct ieee80211_channel *chan)
244 {
245 if (chan == IEEE80211_CHAN_ANYC) /* XXX while scanning */
246 chan = ic->ic_curchan;
247 ni->ni_chan = chan;
248 ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)];
249 }
250
251 /*
252 * AP scanning support.
253 */
254
255 #ifdef IEEE80211_DEBUG
256 static void
dump_chanlist(const u_char chans[])257 dump_chanlist(const u_char chans[])
258 {
259 const char *sep;
260 int i;
261
262 sep = " ";
263 for (i = 0; i < IEEE80211_CHAN_MAX; i++)
264 if (isset(chans, i)) {
265 printf("%s%u", sep, i);
266 sep = ", ";
267 }
268 }
269 #endif /* IEEE80211_DEBUG */
270
271 /*
272 * Initialize the channel set to scan based on the
273 * of available channels and the current PHY mode.
274 */
275 static void
ieee80211_reset_scan(struct ieee80211com * ic)276 ieee80211_reset_scan(struct ieee80211com *ic)
277 {
278
279 /* XXX ic_des_chan should be handled with ic_chan_active */
280 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) {
281 memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan));
282 setbit(ic->ic_chan_scan,
283 ieee80211_chan2ieee(ic, ic->ic_des_chan));
284 } else
285 memcpy(ic->ic_chan_scan, ic->ic_chan_active,
286 sizeof(ic->ic_chan_active));
287 #ifdef IEEE80211_DEBUG
288 if (ieee80211_msg_scan(ic)) {
289 printf("%s: scan set:", __func__);
290 dump_chanlist(ic->ic_chan_scan);
291 printf(" start chan %u\n",
292 ieee80211_chan2ieee(ic, ic->ic_curchan));
293 }
294 #endif /* IEEE80211_DEBUG */
295 }
296
297 /*
298 * Begin an active scan.
299 */
300 void
ieee80211_begin_scan(struct ieee80211com * ic,int reset)301 ieee80211_begin_scan(struct ieee80211com *ic, int reset)
302 {
303
304 ic->ic_scan.nt_scangen++;
305 /*
306 * In all but hostap mode scanning starts off in
307 * an active mode before switching to passive.
308 */
309 if (ic->ic_opmode != IEEE80211_M_HOSTAP) {
310 ic->ic_flags |= IEEE80211_F_ASCAN;
311 ic->ic_stats.is_scan_active++;
312 } else
313 ic->ic_stats.is_scan_passive++;
314 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
315 "begin %s scan in %s mode, scangen %u\n",
316 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive",
317 ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen);
318 /*
319 * Clear scan state and flush any previously seen AP's.
320 */
321 ieee80211_reset_scan(ic);
322 if (reset)
323 ieee80211_free_allnodes(&ic->ic_scan);
324
325 ic->ic_flags |= IEEE80211_F_SCAN;
326
327 /* Scan the next channel. */
328 ieee80211_next_scan(ic);
329 }
330
331 /*
332 * Switch to the next channel marked for scanning.
333 */
334 int
ieee80211_next_scan(struct ieee80211com * ic)335 ieee80211_next_scan(struct ieee80211com *ic)
336 {
337 struct ieee80211_channel *chan;
338
339 /*
340 * Insure any previous mgt frame timeouts don't fire.
341 * This assumes the driver does the right thing in
342 * flushing anything queued in the driver and below.
343 */
344 ic->ic_mgt_timer = 0;
345 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
346
347 chan = ic->ic_curchan;
348 do {
349 if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX])
350 chan = &ic->ic_channels[0];
351 if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) {
352 clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan));
353 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
354 "%s: chan %d->%d\n", __func__,
355 ieee80211_chan2ieee(ic, ic->ic_curchan),
356 ieee80211_chan2ieee(ic, chan));
357 ic->ic_curchan = chan;
358 /*
359 * XXX drivers should do this as needed,
360 * XXX for now maintain compatibility
361 */
362 ic->ic_bss->ni_rates =
363 ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)];
364 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
365 return 1;
366 }
367 } while (chan != ic->ic_curchan);
368 ieee80211_end_scan(ic);
369 return 0;
370 }
371
372 /*
373 * Probe the curent channel, if allowed, while scanning.
374 * If the channel is not marked passive-only then send
375 * a probe request immediately. Otherwise mark state and
376 * listen for beacons on the channel; if we receive something
377 * then we'll transmit a probe request.
378 */
379 void
ieee80211_probe_curchan(struct ieee80211com * ic,int force)380 ieee80211_probe_curchan(struct ieee80211com *ic, int force)
381 {
382 struct ifnet *ifp = ic->ic_ifp;
383
384 if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 || force) {
385 /*
386 * XXX send both broadcast+directed probe request
387 */
388 ieee80211_send_probereq(ic->ic_bss,
389 ic->ic_myaddr, ifp->if_broadcastaddr,
390 ifp->if_broadcastaddr,
391 ic->ic_des_essid, ic->ic_des_esslen,
392 ic->ic_opt_ie, ic->ic_opt_ie_len);
393 } else
394 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
395 }
396
397 static __inline void
copy_bss(struct ieee80211_node * nbss,const struct ieee80211_node * obss)398 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
399 {
400 /* propagate useful state */
401 nbss->ni_authmode = obss->ni_authmode;
402 nbss->ni_txpower = obss->ni_txpower;
403 nbss->ni_vlan = obss->ni_vlan;
404 nbss->ni_rsn = obss->ni_rsn;
405 /* XXX statistics? */
406 }
407
408 void
ieee80211_create_ibss(struct ieee80211com * ic,struct ieee80211_channel * chan)409 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
410 {
411 struct ieee80211_node_table *nt;
412 struct ieee80211_node *ni;
413
414 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
415 "%s: creating ibss\n", __func__);
416
417 /*
418 * Create the station/neighbor table. Note that for adhoc
419 * mode we make the initial inactivity timer longer since
420 * we create nodes only through discovery and they typically
421 * are long-lived associations.
422 */
423 nt = &ic->ic_sta;
424 IEEE80211_NODE_LOCK(nt);
425 if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
426 nt->nt_name = "station";
427 nt->nt_inact_init = ic->ic_inact_init;
428 } else {
429 nt->nt_name = "neighbor";
430 nt->nt_inact_init = ic->ic_inact_run;
431 }
432 IEEE80211_NODE_UNLOCK(nt);
433
434 ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr);
435 if (ni == NULL) {
436 /* XXX recovery? */
437 return;
438 }
439 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr);
440 ni->ni_esslen = ic->ic_des_esslen;
441 memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen);
442 copy_bss(ni, ic->ic_bss);
443 ni->ni_intval = ic->ic_bintval;
444 if (ic->ic_flags & IEEE80211_F_PRIVACY)
445 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
446 if (ic->ic_phytype == IEEE80211_T_FH) {
447 ni->ni_fhdwell = 200; /* XXX */
448 ni->ni_fhindex = 1;
449 }
450 if (ic->ic_opmode == IEEE80211_M_IBSS) {
451 ic->ic_flags |= IEEE80211_F_SIBSS;
452 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */
453 if (ic->ic_flags & IEEE80211_F_DESBSSID)
454 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
455 else
456 ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
457 }
458 /*
459 * Fix the channel and related attributes.
460 */
461 ieee80211_set_chan(ic, ni, chan);
462 ic->ic_curchan = chan;
463 ic->ic_curmode = ieee80211_chan2mode(ic, chan);
464 /*
465 * Do mode-specific rate setup.
466 */
467 if (ic->ic_curmode == IEEE80211_MODE_11G) {
468 /*
469 * Use a mixed 11b/11g rate set.
470 */
471 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G);
472 } else if (ic->ic_curmode == IEEE80211_MODE_11B) {
473 /*
474 * Force pure 11b rate set.
475 */
476 ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B);
477 }
478
479 (void) ieee80211_sta_join(ic, ieee80211_ref_node(ni));
480 }
481
482 void
ieee80211_reset_bss(struct ieee80211com * ic)483 ieee80211_reset_bss(struct ieee80211com *ic)
484 {
485 struct ieee80211_node *ni, *obss;
486
487 ieee80211_node_table_reset(&ic->ic_scan);
488 ieee80211_node_table_reset(&ic->ic_sta);
489
490 ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr);
491 IASSERT(ni != NULL, ("unable to setup inital BSS node"));
492 obss = ic->ic_bss;
493 ic->ic_bss = ieee80211_ref_node(ni);
494 if (obss != NULL) {
495 copy_bss(ni, obss);
496 ni->ni_intval = ic->ic_bintval;
497 ieee80211_free_node(obss);
498 }
499 }
500
501 /* XXX tunable */
502 #define STA_FAILS_MAX 2 /* assoc failures before ignored */
503
504 static int
ieee80211_match_bss(struct ieee80211com * ic,struct ieee80211_node * ni)505 ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni)
506 {
507 u_int8_t rate;
508 int fail;
509
510 fail = 0;
511 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
512 fail |= 0x01;
513 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
514 ni->ni_chan != ic->ic_des_chan)
515 fail |= 0x01;
516 if (ic->ic_opmode == IEEE80211_M_IBSS) {
517 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
518 fail |= 0x02;
519 } else {
520 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
521 fail |= 0x02;
522 }
523 if (ic->ic_flags & IEEE80211_F_PRIVACY) {
524 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
525 fail |= 0x04;
526 } else {
527 /* XXX does this mean privacy is supported or required? */
528 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
529 fail |= 0x04;
530 }
531 rate = ieee80211_fix_rate(ni, IEEE80211_R_DONEGO | IEEE80211_R_DOFRATE);
532 if (rate & IEEE80211_RATE_BASIC)
533 fail |= 0x08;
534 if (ic->ic_des_esslen != 0 &&
535 (ni->ni_esslen != ic->ic_des_esslen ||
536 memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0))
537 fail |= 0x10;
538 if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
539 !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
540 fail |= 0x20;
541 if (ni->ni_fails >= STA_FAILS_MAX)
542 fail |= 0x40;
543 #ifdef IEEE80211_DEBUG
544 if (ieee80211_msg_scan(ic)) {
545 printf(" %c %s",
546 fail & 0x40 ? '=' : fail & 0x80 ? '^' : fail ? '-' : '+',
547 ether_sprintf(ni->ni_macaddr));
548 printf(" %s%c", ether_sprintf(ni->ni_bssid),
549 fail & 0x20 ? '!' : ' ');
550 printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan),
551 fail & 0x01 ? '!' : ' ');
552 printf(" %+4d", ni->ni_rssi);
553 printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
554 fail & 0x08 ? '!' : ' ');
555 printf(" %4s%c",
556 (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
557 (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
558 "????",
559 fail & 0x02 ? '!' : ' ');
560 printf(" %3s%c ",
561 (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?
562 "wep" : "no",
563 fail & 0x04 ? '!' : ' ');
564 ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
565 printf("%s\n", fail & 0x10 ? "!" : "");
566 }
567 #endif
568 return fail;
569 }
570
571 static __inline u_int8_t
maxrate(const struct ieee80211_node * ni)572 maxrate(const struct ieee80211_node *ni)
573 {
574 const struct ieee80211_rateset *rs = &ni->ni_rates;
575 /* NB: assumes rate set is sorted (happens on frame receive) */
576 return rs->rs_rates[rs->rs_nrates-1] & IEEE80211_RATE_VAL;
577 }
578
579 /*
580 * Compare the capabilities of two nodes and decide which is
581 * more desirable (return >0 if a is considered better). Note
582 * that we assume compatibility/usability has already been checked
583 * so we don't need to (e.g. validate whether privacy is supported).
584 * Used to select the best scan candidate for association in a BSS.
585 */
586 static int
ieee80211_node_compare(struct ieee80211com * ic,const struct ieee80211_node * a,const struct ieee80211_node * b)587 ieee80211_node_compare(struct ieee80211com *ic,
588 const struct ieee80211_node *a,
589 const struct ieee80211_node *b)
590 {
591 u_int8_t maxa, maxb;
592 u_int8_t rssia, rssib;
593 int weight;
594
595 /* privacy support preferred */
596 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) &&
597 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
598 return 1;
599 if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 &&
600 (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY))
601 return -1;
602
603 /* compare count of previous failures */
604 weight = b->ni_fails - a->ni_fails;
605 if (abs(weight) > 1)
606 return weight;
607
608 rssia = ic->ic_node_getrssi(a);
609 rssib = ic->ic_node_getrssi(b);
610 if (abs(rssib - rssia) < 5) {
611 /* best/max rate preferred if signal level close enough XXX */
612 maxa = maxrate(a);
613 maxb = maxrate(b);
614 if (maxa != maxb)
615 return maxa - maxb;
616 /* XXX use freq for channel preference */
617 /* for now just prefer 5 GHz band to all other bands */
618 if (IEEE80211_IS_CHAN_5GHZ(a->ni_chan) &&
619 !IEEE80211_IS_CHAN_5GHZ(b->ni_chan))
620 return 1;
621 if (!IEEE80211_IS_CHAN_5GHZ(a->ni_chan) &&
622 IEEE80211_IS_CHAN_5GHZ(b->ni_chan))
623 return -1;
624 }
625 /* all things being equal, use signal level */
626 return rssia - rssib;
627 }
628
629 /*
630 * Mark an ongoing scan stopped.
631 */
632 void
ieee80211_cancel_scan(struct ieee80211com * ic)633 ieee80211_cancel_scan(struct ieee80211com *ic)
634 {
635
636 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: end %s scan\n",
637 __func__,
638 (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive");
639
640 ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN);
641 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
642 }
643
644 /*
645 * Complete a scan of potential channels.
646 */
647 void
ieee80211_end_scan(struct ieee80211com * ic)648 ieee80211_end_scan(struct ieee80211com *ic)
649 {
650 struct ieee80211_node_table *nt = &ic->ic_scan;
651 struct ieee80211_node *ni, *selbs;
652
653 ieee80211_cancel_scan(ic);
654 ieee80211_notify_scan_done(ic);
655
656 #ifndef IEEE80211_NO_HOSTAP
657 if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
658 u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */
659 int i, bestchan;
660 u_int8_t rssi;
661
662 /*
663 * The passive scan to look for existing AP's completed,
664 * select a channel to camp on. Identify the channels
665 * that already have one or more AP's and try to locate
666 * an unoccupied one. If that fails, pick a channel that
667 * looks to be quietest.
668 */
669 memset(maxrssi, 0, sizeof(maxrssi));
670 IEEE80211_NODE_LOCK(nt);
671 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
672 rssi = ic->ic_node_getrssi(ni);
673 i = ieee80211_chan2ieee(ic, ni->ni_chan);
674 if (rssi > maxrssi[i])
675 maxrssi[i] = rssi;
676 }
677 IEEE80211_NODE_UNLOCK(nt);
678 /* XXX select channel more intelligently */
679 bestchan = -1;
680 for (i = 0; i < IEEE80211_CHAN_MAX; i++)
681 if (isset(ic->ic_chan_active, i)) {
682 /*
683 * If the channel is unoccupied the max rssi
684 * should be zero; just take it. Otherwise
685 * track the channel with the lowest rssi and
686 * use that when all channels appear occupied.
687 */
688 if (maxrssi[i] == 0) {
689 bestchan = i;
690 break;
691 }
692 if (bestchan == -1 ||
693 maxrssi[i] < maxrssi[bestchan])
694 bestchan = i;
695 }
696 if (bestchan != -1) {
697 ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]);
698 return;
699 }
700 /* no suitable channel, should not happen */
701 }
702 #endif /* !IEEE80211_NO_HOSTAP */
703
704 /*
705 * When manually sequencing the state machine; scan just once
706 * regardless of whether we have a candidate or not. The
707 * controlling application is expected to setup state and
708 * initiate an association.
709 */
710 if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL)
711 return;
712 /*
713 * Automatic sequencing; look for a candidate and
714 * if found join the network.
715 */
716 /* NB: unlocked read should be ok */
717 if (TAILQ_FIRST(&nt->nt_node) == NULL) {
718 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
719 "%s: no scan candidate\n", __func__);
720 notfound:
721 if (ic->ic_opmode == IEEE80211_M_IBSS &&
722 (ic->ic_flags & IEEE80211_F_IBSSON) &&
723 ic->ic_des_esslen != 0) {
724 ieee80211_create_ibss(ic, ic->ic_ibss_chan);
725 return;
726 }
727 /*
728 * Decrement the failure counts so entries will be
729 * reconsidered the next time around. We really want
730 * to do this only for sta's where we've previously
731 * had some success.
732 */
733 IEEE80211_NODE_LOCK(nt);
734 TAILQ_FOREACH(ni, &nt->nt_node, ni_list)
735 if (ni->ni_fails)
736 ni->ni_fails--;
737 IEEE80211_NODE_UNLOCK(nt);
738 /*
739 * Reset the list of channels to scan and start again.
740 */
741 ieee80211_reset_scan(ic);
742 ic->ic_flags |= IEEE80211_F_SCAN;
743 ieee80211_next_scan(ic);
744 return;
745 }
746 selbs = NULL;
747 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n",
748 "macaddr bssid chan rssi rate flag wep essid");
749 IEEE80211_NODE_LOCK(nt);
750 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
751 if (ieee80211_match_bss(ic, ni) == 0) {
752 if (selbs == NULL)
753 selbs = ni;
754 else if (ieee80211_node_compare(ic, ni, selbs) > 0)
755 selbs = ni;
756 }
757 }
758 if (selbs != NULL) /* NB: grab ref while dropping lock */
759 (void) ieee80211_ref_node(selbs);
760 IEEE80211_NODE_UNLOCK(nt);
761 if (selbs == NULL)
762 goto notfound;
763 if (!ieee80211_sta_join(ic, selbs)) {
764 ieee80211_free_node(selbs);
765 goto notfound;
766 }
767 }
768
769 /*
770 * Handle 802.11 ad hoc network merge. The
771 * convention, set by the Wireless Ethernet Compatibility Alliance
772 * (WECA), is that an 802.11 station will change its BSSID to match
773 * the "oldest" 802.11 ad hoc network, on the same channel, that
774 * has the station's desired SSID. The "oldest" 802.11 network
775 * sends beacons with the greatest TSF timestamp.
776 *
777 * The caller is assumed to validate TSF's before attempting a merge.
778 *
779 * Return !0 if the BSSID changed, 0 otherwise.
780 */
781 int
ieee80211_ibss_merge(struct ieee80211_node * ni)782 ieee80211_ibss_merge(struct ieee80211_node *ni)
783 {
784 struct ieee80211com *ic = ni->ni_ic;
785
786 if (ni == ic->ic_bss ||
787 IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) {
788 /* unchanged, nothing to do */
789 return 0;
790 }
791 if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */
792 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
793 "%s: merge failed, capabilities mismatch\n", __func__);
794 ic->ic_stats.is_ibss_capmismatch++;
795 return 0;
796 }
797 if (!ieee80211_sta_join(ic, ieee80211_ref_node(ni)))
798 return 0;
799 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
800 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
801 ether_sprintf(ni->ni_bssid),
802 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
803 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
804 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : ""
805 );
806 ic->ic_flags &= ~IEEE80211_F_SIBSS;
807 return 1;
808 }
809
810 /*
811 * Join the specified IBSS/BSS network. The node is assumed to
812 * be passed in with a held reference.
813 */
814 int
ieee80211_sta_join(struct ieee80211com * ic,struct ieee80211_node * selbs)815 ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs)
816 {
817 struct ieee80211_node *obss;
818
819 if (ic->ic_opmode == IEEE80211_M_IBSS) {
820 struct ieee80211_node_table *nt;
821 /*
822 * Delete unusable rates; we've already checked
823 * that the negotiated rate set is acceptable.
824 */
825 ieee80211_fix_rate(selbs, IEEE80211_R_DODEL);
826 /*
827 * Fillin the neighbor table; it will already
828 * exist if we are simply switching mastership.
829 * XXX ic_sta always setup so this is unnecessary?
830 */
831 nt = &ic->ic_sta;
832 IEEE80211_NODE_LOCK(nt);
833 nt->nt_name = "neighbor";
834 nt->nt_inact_init = ic->ic_inact_run;
835 IEEE80211_NODE_UNLOCK(nt);
836 }
837
838 /*
839 * Committed to selbs, setup state.
840 */
841 obss = ic->ic_bss;
842 ic->ic_bss = selbs; /* NB: caller assumed to bump refcnt */
843 if (obss != NULL) {
844 copy_bss(selbs, obss);
845 ieee80211_free_node(obss);
846 }
847 /*
848 * Set the erp state (mostly the slot time) to deal with
849 * the auto-select case; this should be redundant if the
850 * mode is locked.
851 */
852 ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan);
853 ic->ic_curchan = selbs->ni_chan;
854 ieee80211_reset_erp(ic);
855 ieee80211_wme_initparams(ic);
856
857 if (ic->ic_opmode == IEEE80211_M_STA)
858 ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
859 else
860 ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
861 return 1;
862 }
863
864 /*
865 * Leave the specified IBSS/BSS network. The node is assumed to
866 * be passed in with a held reference.
867 */
868 void
ieee80211_sta_leave(struct ieee80211com * ic,struct ieee80211_node * ni)869 ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
870 {
871 ic->ic_node_cleanup(ni);
872 ieee80211_notify_node_leave(ic, ni);
873 }
874
875 int
ieee80211_get_rate(const struct ieee80211_node * const ni)876 ieee80211_get_rate(const struct ieee80211_node * const ni)
877 {
878 #define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
879 int ix, rate;
880 struct ieee80211com *ic = ni->ni_ic;
881 const struct ieee80211_rateset *rs;
882
883 IASSERT(ni != NULL, ("ni != NULL"));
884 IASSERT(ieee80211_node_refcnt(ni) > 0,
885 ("refcnt(ni) == %d", ieee80211_node_refcnt(ni)));
886 IASSERT(ic != NULL, ("ic != NULL"));
887 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
888 rs = &ic->ic_sup_rates[ic->ic_curmode];
889 rate = rs->rs_rates[ic->ic_fixed_rate] & IEEE80211_RATE_VAL;
890 for (ix = ni->ni_rates.rs_nrates - 1;
891 ix >= 0 && RATE(ix) != rate; ix--)
892 ;
893 if (ix < 0) {
894 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG,
895 "%s: fixed rate %d (%d.%d Mb/s) not in rate set",
896 __func__, ic->ic_fixed_rate, (rate * 5) / 10,
897 (rate * 5) % 10);
898 goto no_rate;
899 }
900 } else if (ic->ic_state == IEEE80211_S_RUN)
901 rate = ni->ni_rates.rs_rates[ni->ni_txrate];
902 else {
903 no_rate:
904 rs = &ni->ni_rates;
905 /* Choose node's lowest basic rate, or else its lowest rate. */
906 for (ix = 0; ix < rs->rs_nrates; ix++) {
907 if (rs->rs_rates[ix] & IEEE80211_RATE_BASIC)
908 return rs->rs_rates[ix] & IEEE80211_RATE_VAL;
909 }
910 return ni->ni_rates.rs_rates[0] & IEEE80211_RATE_VAL;
911 }
912 return rate & IEEE80211_RATE_VAL;
913 }
914
915 static struct ieee80211_node *
node_alloc(struct ieee80211_node_table * nt)916 node_alloc(struct ieee80211_node_table *nt)
917 {
918 struct ieee80211_node *ni;
919
920 ni = malloc(sizeof(struct ieee80211_node),
921 M_80211_NODE, M_NOWAIT | M_ZERO);
922 return ni;
923 }
924
925 /*
926 * Reclaim any resources in a node and reset any critical
927 * state. Typically nodes are free'd immediately after,
928 * but in some cases the storage may be reused so we need
929 * to insure consistent state (should probably fix that).
930 */
931 static void
node_cleanup(struct ieee80211_node * ni)932 node_cleanup(struct ieee80211_node *ni)
933 {
934 #define N(a) (sizeof(a)/sizeof(a[0]))
935 struct ieee80211com *ic = ni->ni_ic;
936 int i, qlen;
937
938 /* NB: preserve ni_table */
939 if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
940 ic->ic_ps_sta--;
941 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
942 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
943 "[%s] power save mode off, %u sta's in ps mode\n",
944 ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
945 }
946 /*
947 * Clear AREF flag that marks the authorization refcnt bump
948 * has happened. This is probably not needed as the node
949 * should always be removed from the table so not found but
950 * do it just in case.
951 */
952 ni->ni_flags &= ~IEEE80211_NODE_AREF;
953
954 /*
955 * Drain power save queue and, if needed, clear TIM.
956 */
957 IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen);
958 if (qlen != 0 && ic->ic_set_tim != NULL)
959 ic->ic_set_tim(ni, 0);
960
961 ni->ni_associd = 0;
962 if (ni->ni_challenge != NULL) {
963 free(ni->ni_challenge, M_DEVBUF);
964 ni->ni_challenge = NULL;
965 }
966 /*
967 * Preserve SSID, WPA, and WME ie's so the bss node is
968 * reusable during a re-auth/re-assoc state transition.
969 * If we remove these data they will not be recreated
970 * because they come from a probe-response or beacon frame
971 * which cannot be expected prior to the association-response.
972 * This should not be an issue when operating in other modes
973 * as stations leaving always go through a full state transition
974 * which will rebuild this state.
975 *
976 * XXX does this leave us open to inheriting old state?
977 */
978 for (i = 0; i < N(ni->ni_rxfrag); i++)
979 if (ni->ni_rxfrag[i] != NULL) {
980 m_freem(ni->ni_rxfrag[i]);
981 ni->ni_rxfrag[i] = NULL;
982 }
983 /*
984 * Must be careful here to remove any key map entry w/o a LOR.
985 */
986 ieee80211_node_delucastkey(ni);
987 #undef N
988 }
989
990 static void
node_free(struct ieee80211_node * ni)991 node_free(struct ieee80211_node *ni)
992 {
993 struct ieee80211com *ic = ni->ni_ic;
994
995 ic->ic_node_cleanup(ni);
996 if (ni->ni_wpa_ie != NULL)
997 free(ni->ni_wpa_ie, M_DEVBUF);
998 if (ni->ni_wme_ie != NULL)
999 free(ni->ni_wme_ie, M_DEVBUF);
1000 IEEE80211_NODE_SAVEQ_DESTROY(ni);
1001 free(ni, M_80211_NODE);
1002 }
1003
1004 static u_int8_t
node_getrssi(const struct ieee80211_node * ni)1005 node_getrssi(const struct ieee80211_node *ni)
1006 {
1007 return ni->ni_rssi;
1008 }
1009
1010 static void
ieee80211_setup_node(struct ieee80211_node_table * nt,struct ieee80211_node * ni,const u_int8_t * macaddr)1011 ieee80211_setup_node(struct ieee80211_node_table *nt,
1012 struct ieee80211_node *ni, const u_int8_t *macaddr)
1013 {
1014 struct ieee80211com *ic = nt->nt_ic;
1015 int hash;
1016
1017 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1018 "%s %p<%s> in %s table\n", __func__, ni,
1019 ether_sprintf(macaddr), nt->nt_name);
1020
1021 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
1022 hash = IEEE80211_NODE_HASH(macaddr);
1023 ieee80211_node_initref(ni); /* mark referenced */
1024 ni->ni_chan = IEEE80211_CHAN_ANYC;
1025 ni->ni_authmode = IEEE80211_AUTH_OPEN;
1026 ni->ni_txpower = ic->ic_txpowlimit; /* max power */
1027 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
1028 ni->ni_inact_reload = nt->nt_inact_init;
1029 ni->ni_inact = ni->ni_inact_reload;
1030 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
1031
1032 IEEE80211_NODE_LOCK(nt);
1033 TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
1034 LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
1035 ni->ni_table = nt;
1036 ni->ni_ic = ic;
1037 IEEE80211_NODE_UNLOCK(nt);
1038 }
1039
1040 struct ieee80211_node *
ieee80211_alloc_node(struct ieee80211_node_table * nt,const u_int8_t * macaddr)1041 ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
1042 {
1043 struct ieee80211com *ic = nt->nt_ic;
1044 struct ieee80211_node *ni;
1045
1046 ni = ic->ic_node_alloc(nt);
1047 if (ni != NULL)
1048 ieee80211_setup_node(nt, ni, macaddr);
1049 else
1050 ic->ic_stats.is_rx_nodealloc++;
1051 return ni;
1052 }
1053
1054 /*
1055 * Craft a temporary node suitable for sending a management frame
1056 * to the specified station. We craft only as much state as we
1057 * need to do the work since the node will be immediately reclaimed
1058 * once the send completes.
1059 */
1060 struct ieee80211_node *
ieee80211_tmp_node(struct ieee80211com * ic,const u_int8_t * macaddr)1061 ieee80211_tmp_node(struct ieee80211com *ic, const u_int8_t *macaddr)
1062 {
1063 struct ieee80211_node *ni;
1064
1065 ni = ic->ic_node_alloc(&ic->ic_sta);
1066 if (ni != NULL) {
1067 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1068 "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
1069
1070 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
1071 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
1072 ieee80211_node_initref(ni); /* mark referenced */
1073 ni->ni_txpower = ic->ic_bss->ni_txpower;
1074 /* NB: required by ieee80211_fix_rate */
1075 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan);
1076 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey,
1077 IEEE80211_KEYIX_NONE);
1078 /* XXX optimize away */
1079 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
1080
1081 ni->ni_table = NULL; /* NB: pedantic */
1082 ni->ni_ic = ic;
1083 } else {
1084 /* XXX msg */
1085 ic->ic_stats.is_rx_nodealloc++;
1086 }
1087 return ni;
1088 }
1089
1090 struct ieee80211_node *
ieee80211_dup_bss(struct ieee80211_node_table * nt,const u_int8_t * macaddr)1091 ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
1092 {
1093 struct ieee80211com *ic = nt->nt_ic;
1094 struct ieee80211_node *ni;
1095
1096 ni = ic->ic_node_alloc(nt);
1097 if (ni != NULL) {
1098 ieee80211_setup_node(nt, ni, macaddr);
1099 /*
1100 * Inherit from ic_bss.
1101 */
1102 ni->ni_authmode = ic->ic_bss->ni_authmode;
1103 ni->ni_txpower = ic->ic_bss->ni_txpower;
1104 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */
1105 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
1106 ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan);
1107 ni->ni_rsn = ic->ic_bss->ni_rsn;
1108 } else
1109 ic->ic_stats.is_rx_nodealloc++;
1110 return ni;
1111 }
1112
1113 static struct ieee80211_node *
1114 #ifdef IEEE80211_DEBUG_REFCNT
_ieee80211_find_node_debug(struct ieee80211_node_table * nt,const u_int8_t * macaddr,const char * func,int line)1115 _ieee80211_find_node_debug(struct ieee80211_node_table *nt,
1116 const u_int8_t *macaddr, const char *func, int line)
1117 #else
1118 _ieee80211_find_node(struct ieee80211_node_table *nt,
1119 const u_int8_t *macaddr)
1120 #endif
1121 {
1122 struct ieee80211_node *ni;
1123 int hash;
1124
1125 IEEE80211_NODE_LOCK_ASSERT(nt);
1126
1127 hash = IEEE80211_NODE_HASH(macaddr);
1128 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1129 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
1130 ieee80211_ref_node(ni); /* mark referenced */
1131 #ifdef IEEE80211_DEBUG_REFCNT
1132 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
1133 "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1134 func, line,
1135 ni, ether_sprintf(ni->ni_macaddr),
1136 ieee80211_node_refcnt(ni));
1137 #endif
1138 return ni;
1139 }
1140 }
1141 return NULL;
1142 }
1143 #ifdef IEEE80211_DEBUG_REFCNT
1144 #define _ieee80211_find_node(nt, mac) \
1145 _ieee80211_find_node_debug(nt, mac, func, line)
1146 #endif
1147
1148 struct ieee80211_node *
1149 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_debug(struct ieee80211_node_table * nt,const u_int8_t * macaddr,const char * func,int line)1150 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
1151 const u_int8_t *macaddr, const char *func, int line)
1152 #else
1153 ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
1154 #endif
1155 {
1156 struct ieee80211_node *ni;
1157
1158 IEEE80211_NODE_LOCK(nt);
1159 ni = _ieee80211_find_node(nt, macaddr);
1160 IEEE80211_NODE_UNLOCK(nt);
1161 return ni;
1162 }
1163
1164 /*
1165 * Fake up a node; this handles node discovery in adhoc mode.
1166 * Note that for the driver's benefit we treat this like
1167 * an association so the driver has an opportunity to setup
1168 * its private state.
1169 */
1170 struct ieee80211_node *
ieee80211_fakeup_adhoc_node(struct ieee80211_node_table * nt,const u_int8_t macaddr[IEEE80211_ADDR_LEN])1171 ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt,
1172 const u_int8_t macaddr[IEEE80211_ADDR_LEN])
1173 {
1174 struct ieee80211com *ic = nt->nt_ic;
1175 struct ieee80211_node *ni;
1176
1177 ni = ieee80211_dup_bss(nt, macaddr);
1178 if (ni != NULL) {
1179 /* XXX no rate negotiation; just dup */
1180 ni->ni_rates = ic->ic_bss->ni_rates;
1181 if (ic->ic_newassoc != NULL)
1182 ic->ic_newassoc(ni, 1);
1183 /* XXX not right for 802.1x/WPA */
1184 ieee80211_node_authorize(ni);
1185 }
1186 return ni;
1187 }
1188
1189 #ifdef IEEE80211_DEBUG
1190 static void
dump_probe_beacon(u_int8_t subtype,int isnew,const u_int8_t mac[IEEE80211_ADDR_LEN],const struct ieee80211_scanparams * sp)1191 dump_probe_beacon(u_int8_t subtype, int isnew,
1192 const u_int8_t mac[IEEE80211_ADDR_LEN],
1193 const struct ieee80211_scanparams *sp)
1194 {
1195
1196 printf("[%s] %s%s on chan %u (bss chan %u) ",
1197 ether_sprintf(mac), isnew ? "new " : "",
1198 ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT],
1199 sp->chan, sp->bchan);
1200 ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]);
1201 printf("\n");
1202
1203 if (isnew) {
1204 printf("[%s] caps 0x%x bintval %u erp 0x%x",
1205 ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp);
1206 if (sp->country != NULL) {
1207 #ifdef __FreeBSD__
1208 printf(" country info %*D",
1209 sp->country[1], sp->country+2, " ");
1210 #else
1211 int i;
1212 printf(" country info");
1213 for (i = 0; i < sp->country[1]; i++)
1214 printf(" %02x", sp->country[i+2]);
1215 #endif
1216 }
1217 printf("\n");
1218 }
1219 }
1220 #endif /* IEEE80211_DEBUG */
1221
1222 static void
saveie(u_int8_t ** iep,const u_int8_t * ie)1223 saveie(u_int8_t **iep, const u_int8_t *ie)
1224 {
1225
1226 if (ie == NULL)
1227 *iep = NULL;
1228 else
1229 ieee80211_saveie(iep, ie);
1230 }
1231
1232 /*
1233 * Process a beacon or probe response frame.
1234 */
1235 void
ieee80211_add_scan(struct ieee80211com * ic,const struct ieee80211_scanparams * sp,const struct ieee80211_frame * wh,int subtype,int rssi,int rstamp)1236 ieee80211_add_scan(struct ieee80211com *ic,
1237 const struct ieee80211_scanparams *sp,
1238 const struct ieee80211_frame *wh,
1239 int subtype, int rssi, int rstamp)
1240 {
1241 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1242 struct ieee80211_node_table *nt = &ic->ic_scan;
1243 struct ieee80211_node *ni;
1244 int newnode = 0;
1245
1246 ni = ieee80211_find_node(nt, wh->i_addr2);
1247 if (ni == NULL) {
1248 /*
1249 * Create a new entry.
1250 */
1251 ni = ic->ic_node_alloc(nt);
1252 if (ni == NULL) {
1253 ic->ic_stats.is_rx_nodealloc++;
1254 return;
1255 }
1256 ieee80211_setup_node(nt, ni, wh->i_addr2);
1257 /*
1258 * XXX inherit from ic_bss.
1259 */
1260 ni->ni_authmode = ic->ic_bss->ni_authmode;
1261 ni->ni_txpower = ic->ic_bss->ni_txpower;
1262 ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */
1263 ieee80211_set_chan(ic, ni, ic->ic_curchan);
1264 ni->ni_rsn = ic->ic_bss->ni_rsn;
1265 newnode = 1;
1266 }
1267 #ifdef IEEE80211_DEBUG
1268 if (ieee80211_msg_scan(ic) && (ic->ic_flags & IEEE80211_F_SCAN))
1269 dump_probe_beacon(subtype, newnode, wh->i_addr2, sp);
1270 #endif
1271 /* XXX ap beaconing multiple ssid w/ same bssid */
1272 if (sp->ssid[1] != 0 &&
1273 (ISPROBE(subtype) || ni->ni_esslen == 0)) {
1274 ni->ni_esslen = sp->ssid[1];
1275 memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
1276 memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
1277 }
1278 ni->ni_scangen = ic->ic_scan.nt_scangen;
1279 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
1280 ni->ni_rssi = rssi;
1281 ni->ni_rstamp = rstamp;
1282 memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
1283 ni->ni_intval = sp->bintval;
1284 ni->ni_capinfo = sp->capinfo;
1285 ni->ni_chan = &ic->ic_channels[sp->chan];
1286 ni->ni_fhdwell = sp->fhdwell;
1287 ni->ni_fhindex = sp->fhindex;
1288 ni->ni_erp = sp->erp;
1289 if (sp->tim != NULL) {
1290 struct ieee80211_tim_ie *ie =
1291 (struct ieee80211_tim_ie *) sp->tim;
1292
1293 ni->ni_dtim_count = ie->tim_count;
1294 ni->ni_dtim_period = ie->tim_period;
1295 }
1296 /*
1297 * Record the byte offset from the mac header to
1298 * the start of the TIM information element for
1299 * use by hardware and/or to speedup software
1300 * processing of beacon frames.
1301 */
1302 ni->ni_timoff = sp->timoff;
1303 /*
1304 * Record optional information elements that might be
1305 * used by applications or drivers.
1306 */
1307 saveie(&ni->ni_wme_ie, sp->wme);
1308 saveie(&ni->ni_wpa_ie, sp->wpa);
1309
1310 /* NB: must be after ni_chan is setup */
1311 ieee80211_setup_rates(ni, sp->rates, sp->xrates, IEEE80211_R_DOSORT);
1312
1313 if (!newnode)
1314 ieee80211_free_node(ni);
1315 #undef ISPROBE
1316 }
1317
1318 void
ieee80211_init_neighbor(struct ieee80211com * ic,struct ieee80211_node * ni,const struct ieee80211_frame * wh,const struct ieee80211_scanparams * sp,int isnew)1319 ieee80211_init_neighbor(struct ieee80211com *ic, struct ieee80211_node *ni,
1320 const struct ieee80211_frame *wh, const struct ieee80211_scanparams *sp,
1321 int isnew)
1322 {
1323 ni->ni_esslen = sp->ssid[1];
1324 memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
1325 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
1326 memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
1327 ni->ni_intval = sp->bintval;
1328 ni->ni_capinfo = sp->capinfo;
1329 ni->ni_chan = ic->ic_bss->ni_chan;
1330 ni->ni_fhdwell = sp->fhdwell;
1331 ni->ni_fhindex = sp->fhindex;
1332 ni->ni_erp = sp->erp;
1333 ni->ni_timoff = sp->timoff;
1334 if (sp->wme != NULL)
1335 ieee80211_saveie(&ni->ni_wme_ie, sp->wme);
1336 if (sp->wpa != NULL)
1337 ieee80211_saveie(&ni->ni_wpa_ie, sp->wpa);
1338
1339 /* NB: must be after ni_chan is setup */
1340 ieee80211_setup_rates(ni, sp->rates, sp->xrates,
1341 IEEE80211_R_DODEL | IEEE80211_R_DONEGO | IEEE80211_R_DOSORT);
1342
1343 if (ic->ic_newassoc != NULL)
1344 ic->ic_newassoc(ni, isnew);
1345 }
1346
1347 /*
1348 * Do node discovery in adhoc mode on receipt of a beacon
1349 * or probe response frame. Note that for the driver's
1350 * benefit we we treat this like an association so the
1351 * driver has an opportunity to setup its private state.
1352 */
1353 struct ieee80211_node *
ieee80211_add_neighbor(struct ieee80211com * ic,const struct ieee80211_frame * wh,const struct ieee80211_scanparams * sp)1354 ieee80211_add_neighbor(struct ieee80211com *ic,
1355 const struct ieee80211_frame *wh,
1356 const struct ieee80211_scanparams *sp)
1357 {
1358 struct ieee80211_node *ni;
1359
1360 ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);/* XXX alloc_node? */
1361 if (ni != NULL) {
1362 ieee80211_init_neighbor(ic, ni, wh, sp, 1);
1363 /* XXX not right for 802.1x/WPA */
1364 ieee80211_node_authorize(ni);
1365 }
1366 return ni;
1367 }
1368
1369 #define IS_CTL(wh) \
1370 ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
1371 #define IS_PSPOLL(wh) \
1372 ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
1373 /*
1374 * Locate the node for sender, track state, and then pass the
1375 * (referenced) node up to the 802.11 layer for its use. We
1376 * are required to pass some node so we fall back to ic_bss
1377 * when this frame is from an unknown sender. The 802.11 layer
1378 * knows this means the sender wasn't in the node table and
1379 * acts accordingly.
1380 */
1381 struct ieee80211_node *
1382 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_rxnode_debug(struct ieee80211com * ic,const struct ieee80211_frame_min * wh,const char * func,int line)1383 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
1384 const struct ieee80211_frame_min *wh, const char *func, int line)
1385 #else
1386 ieee80211_find_rxnode(struct ieee80211com *ic,
1387 const struct ieee80211_frame_min *wh)
1388 #endif
1389 {
1390 struct ieee80211_node_table *nt;
1391 struct ieee80211_node *ni;
1392
1393 /* XXX may want scanned nodes in the neighbor table for adhoc */
1394 if (ic->ic_opmode == IEEE80211_M_STA ||
1395 ic->ic_opmode == IEEE80211_M_MONITOR ||
1396 (ic->ic_flags & IEEE80211_F_SCAN))
1397 nt = &ic->ic_scan;
1398 else
1399 nt = &ic->ic_sta;
1400 /* XXX check ic_bss first in station mode */
1401 /* XXX 4-address frames? */
1402 IEEE80211_NODE_LOCK(nt);
1403 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/)
1404 ni = _ieee80211_find_node(nt, wh->i_addr1);
1405 else
1406 ni = _ieee80211_find_node(nt, wh->i_addr2);
1407 if (ni == NULL)
1408 ni = ieee80211_ref_node(ic->ic_bss);
1409 IEEE80211_NODE_UNLOCK(nt);
1410
1411 return ni;
1412 }
1413
1414 /*
1415 * Like ieee80211_find_rxnode but use the supplied h/w
1416 * key index as a hint to locate the node in the key
1417 * mapping table. If an entry is present at the key
1418 * index we return it; otherwise do a normal lookup and
1419 * update the mapping table if the station has a unicast
1420 * key assigned to it.
1421 */
1422 struct ieee80211_node *
1423 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_rxnode_withkey_debug(struct ieee80211com * ic,const struct ieee80211_frame_min * wh,ieee80211_keyix keyix,const char * func,int line)1424 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
1425 const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
1426 const char *func, int line)
1427 #else
1428 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
1429 const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
1430 #endif
1431 {
1432 struct ieee80211_node_table *nt;
1433 struct ieee80211_node *ni;
1434
1435 if (ic->ic_opmode == IEEE80211_M_STA ||
1436 ic->ic_opmode == IEEE80211_M_MONITOR ||
1437 (ic->ic_flags & IEEE80211_F_SCAN))
1438 nt = &ic->ic_scan;
1439 else
1440 nt = &ic->ic_sta;
1441 IEEE80211_NODE_LOCK(nt);
1442 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
1443 ni = nt->nt_keyixmap[keyix];
1444 else
1445 ni = NULL;
1446 if (ni == NULL) {
1447 if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/)
1448 ni = _ieee80211_find_node(nt, wh->i_addr1);
1449 else
1450 ni = _ieee80211_find_node(nt, wh->i_addr2);
1451 if (ni == NULL)
1452 ni = ieee80211_ref_node(ic->ic_bss);
1453 if (nt->nt_keyixmap != NULL) {
1454 /*
1455 * If the station has a unicast key cache slot
1456 * assigned update the key->node mapping table.
1457 */
1458 keyix = ni->ni_ucastkey.wk_rxkeyix;
1459 /* XXX can keyixmap[keyix] != NULL? */
1460 if (keyix < nt->nt_keyixmax &&
1461 nt->nt_keyixmap[keyix] == NULL) {
1462 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
1463 "%s: add key map entry %p<%s> refcnt %d\n",
1464 __func__, ni, ether_sprintf(ni->ni_macaddr),
1465 ieee80211_node_refcnt(ni)+1);
1466 nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
1467 }
1468 }
1469 } else {
1470 ieee80211_ref_node(ni);
1471 }
1472 IEEE80211_NODE_UNLOCK(nt);
1473
1474 return ni;
1475 }
1476 #undef IS_PSPOLL
1477 #undef IS_CTL
1478
1479 /*
1480 * Return a reference to the appropriate node for sending
1481 * a data frame. This handles node discovery in adhoc networks.
1482 */
1483 struct ieee80211_node *
1484 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_txnode_debug(struct ieee80211com * ic,const u_int8_t * macaddr,const char * func,int line)1485 ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr,
1486 const char *func, int line)
1487 #else
1488 ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr)
1489 #endif
1490 {
1491 struct ieee80211_node_table *nt = &ic->ic_sta;
1492 struct ieee80211_node *ni;
1493
1494 /*
1495 * The destination address should be in the node table
1496 * unless this is a multicast/broadcast frame. We can
1497 * also optimize station mode operation, all frames go
1498 * to the bss node.
1499 */
1500 /* XXX can't hold lock across dup_bss 'cuz of recursive locking */
1501 IEEE80211_NODE_LOCK(nt);
1502 if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr))
1503 ni = ieee80211_ref_node(ic->ic_bss);
1504 else
1505 ni = _ieee80211_find_node(nt, macaddr);
1506 IEEE80211_NODE_UNLOCK(nt);
1507
1508 if (ni == NULL) {
1509 if (ic->ic_opmode == IEEE80211_M_IBSS ||
1510 ic->ic_opmode == IEEE80211_M_AHDEMO) {
1511 /*
1512 * In adhoc mode cons up a node for the destination.
1513 * Note that we need an additional reference for the
1514 * caller to be consistent with _ieee80211_find_node.
1515 */
1516 ni = ieee80211_fakeup_adhoc_node(nt, macaddr);
1517 if (ni != NULL)
1518 (void) ieee80211_ref_node(ni);
1519 } else {
1520 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
1521 "[%s] no node, discard frame (%s)\n",
1522 ether_sprintf(macaddr), __func__);
1523 ic->ic_stats.is_tx_nonode++;
1524 }
1525 }
1526 return ni;
1527 }
1528
1529 /*
1530 * Like find but search based on the channel too.
1531 */
1532 struct ieee80211_node *
1533 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_with_channel_debug(struct ieee80211_node_table * nt,const u_int8_t * macaddr,struct ieee80211_channel * chan,const char * func,int line)1534 ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt,
1535 const u_int8_t *macaddr, struct ieee80211_channel *chan,
1536 const char *func, int line)
1537 #else
1538 ieee80211_find_node_with_channel(struct ieee80211_node_table *nt,
1539 const u_int8_t *macaddr, struct ieee80211_channel *chan)
1540 #endif
1541 {
1542 struct ieee80211_node *ni;
1543 int hash;
1544
1545 hash = IEEE80211_NODE_HASH(macaddr);
1546 IEEE80211_NODE_LOCK(nt);
1547 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1548 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) &&
1549 ni->ni_chan == chan) {
1550 ieee80211_ref_node(ni); /* mark referenced */
1551 #ifdef IEEE80211_DEBUG_REFCNT
1552 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
1553 "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1554 func, line,
1555 ni, ether_sprintf(ni->ni_macaddr),
1556 ieee80211_node_refcnt(ni));
1557 #else
1558 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
1559 "%s %p<%s> refcnt %d\n", __func__,
1560 ni, ether_sprintf(ni->ni_macaddr),
1561 ieee80211_node_refcnt(ni));
1562 #endif
1563 break;
1564 }
1565 }
1566 IEEE80211_NODE_UNLOCK(nt);
1567 return ni;
1568 }
1569
1570 struct ieee80211_node *
ieee80211_refine_node_for_beacon(struct ieee80211com * ic,struct ieee80211_node * ni0,struct ieee80211_channel * chan,const u_int8_t * ssid)1571 ieee80211_refine_node_for_beacon(struct ieee80211com *ic,
1572 struct ieee80211_node *ni0, struct ieee80211_channel *chan,
1573 const u_int8_t *ssid)
1574 {
1575 struct ieee80211_node_table *nt = ni0->ni_table;
1576 struct ieee80211_node *best, *ni;
1577 int best_score = 0, score;
1578
1579 if (nt == NULL)
1580 return ni0;
1581
1582 best = ni0;
1583 if (ssid[1] == 0 || best->ni_esslen == 0)
1584 best_score = 1;
1585 else if (ssid[1] == best->ni_esslen &&
1586 memcmp(ssid + 2, best->ni_essid, ssid[1]) == 0)
1587 best_score = 2;
1588 else
1589 best_score = 0;
1590
1591 IEEE80211_NODE_LOCK(nt);
1592 for (ni = LIST_NEXT(ni0, ni_hash); ni != NULL;
1593 ni = LIST_NEXT(ni, ni_hash)) {
1594 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, best->ni_macaddr) ||
1595 ni->ni_ic != best->ni_ic || ni->ni_chan != chan)
1596 continue;
1597
1598 if (ssid[1] == 0 || ni->ni_esslen == 0)
1599 score = 1;
1600 else if (ssid[1] == ni->ni_esslen &&
1601 memcmp(ssid + 2, ni->ni_essid, ssid[1]) == 0)
1602 score = 2;
1603 else
1604 continue;
1605
1606 if (score > best_score) {
1607 best = ni;
1608 best_score = score;
1609 }
1610 }
1611 IEEE80211_NODE_UNLOCK(nt);
1612 return best;
1613 }
1614
1615 /*
1616 * Like find but search based on the ssid too.
1617 */
1618 struct ieee80211_node *
1619 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table * nt,const u_int8_t * macaddr,u_int ssidlen,const u_int8_t * ssid,const char * func,int line)1620 ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt,
1621 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid,
1622 const char *func, int line)
1623 #else
1624 ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt,
1625 const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid)
1626 #endif
1627 {
1628 #define MATCH_SSID(ni, ssid, ssidlen) \
1629 (ni->ni_esslen == ssidlen && memcmp(ni->ni_essid, ssid, ssidlen) == 0)
1630 static const u_int8_t zeromac[IEEE80211_ADDR_LEN];
1631 struct ieee80211com *ic = nt->nt_ic;
1632 struct ieee80211_node *ni;
1633 int hash;
1634
1635 IEEE80211_NODE_LOCK(nt);
1636 /*
1637 * A mac address that is all zero means match only the ssid;
1638 * otherwise we must match both.
1639 */
1640 if (IEEE80211_ADDR_EQ(macaddr, zeromac)) {
1641 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
1642 if (MATCH_SSID(ni, ssid, ssidlen))
1643 break;
1644 }
1645 } else {
1646 hash = IEEE80211_NODE_HASH(macaddr);
1647 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
1648 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) &&
1649 MATCH_SSID(ni, ssid, ssidlen))
1650 break;
1651 }
1652 }
1653 if (ni != NULL) {
1654 ieee80211_ref_node(ni); /* mark referenced */
1655 #ifdef IEEE80211_DEBUG_REFCNT
1656 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1657 "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
1658 func, line,
1659 ni, ether_sprintf(ni->ni_macaddr),
1660 ieee80211_node_refcnt(ni));
1661 #else
1662 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1663 "%s %p<%s> refcnt %d\n", __func__,
1664 ni, ether_sprintf(ni->ni_macaddr),
1665 ieee80211_node_refcnt(ni));
1666 #endif
1667 }
1668 IEEE80211_NODE_UNLOCK(nt);
1669 return ni;
1670 #undef MATCH_SSID
1671 }
1672
1673 static void
_ieee80211_free_node(struct ieee80211_node * ni)1674 _ieee80211_free_node(struct ieee80211_node *ni)
1675 {
1676 struct ieee80211com *ic = ni->ni_ic;
1677 struct ieee80211_node_table *nt = ni->ni_table;
1678
1679 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1680 "%s %p<%s> in %s table\n", __func__, ni,
1681 ether_sprintf(ni->ni_macaddr),
1682 nt != NULL ? nt->nt_name : "<gone>");
1683
1684 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
1685 if (nt != NULL) {
1686 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
1687 LIST_REMOVE(ni, ni_hash);
1688 }
1689 ic->ic_node_free(ni);
1690 }
1691
1692 void
1693 #ifdef IEEE80211_DEBUG_REFCNT
ieee80211_free_node_debug(struct ieee80211_node * ni,const char * func,int line)1694 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
1695 #else
1696 ieee80211_free_node(struct ieee80211_node *ni)
1697 #endif
1698 {
1699 struct ieee80211_node_table *nt = ni->ni_table;
1700
1701 #ifdef IEEE80211_DEBUG_REFCNT
1702 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
1703 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
1704 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
1705 #endif
1706 if (nt != NULL) {
1707 IEEE80211_NODE_LOCK(nt);
1708 if (ieee80211_node_dectestref(ni)) {
1709 /*
1710 * Last reference, reclaim state.
1711 */
1712 _ieee80211_free_node(ni);
1713 } else if (ieee80211_node_refcnt(ni) == 1 &&
1714 nt->nt_keyixmap != NULL) {
1715 ieee80211_keyix keyix;
1716 /*
1717 * Check for a last reference in the key mapping table.
1718 */
1719 keyix = ni->ni_ucastkey.wk_rxkeyix;
1720 if (keyix < nt->nt_keyixmax &&
1721 nt->nt_keyixmap[keyix] == ni) {
1722 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
1723 "%s: %p<%s> clear key map entry", __func__,
1724 ni, ether_sprintf(ni->ni_macaddr));
1725 nt->nt_keyixmap[keyix] = NULL;
1726 ieee80211_node_decref(ni); /* XXX needed? */
1727 _ieee80211_free_node(ni);
1728 }
1729 }
1730 IEEE80211_NODE_UNLOCK(nt);
1731 } else {
1732 if (ieee80211_node_dectestref(ni))
1733 _ieee80211_free_node(ni);
1734 }
1735 }
1736
1737 /*
1738 * Reclaim a unicast key and clear any key cache state.
1739 */
1740 int
ieee80211_node_delucastkey(struct ieee80211_node * ni)1741 ieee80211_node_delucastkey(struct ieee80211_node *ni)
1742 {
1743 struct ieee80211com *ic = ni->ni_ic;
1744 struct ieee80211_node_table *nt = &ic->ic_sta;
1745 struct ieee80211_node *nikey;
1746 ieee80211_keyix keyix;
1747 int isowned, status;
1748
1749 /*
1750 * NB: We must beware of LOR here; deleting the key
1751 * can cause the crypto layer to block traffic updates
1752 * which can generate a LOR against the node table lock;
1753 * grab it here and stash the key index for our use below.
1754 *
1755 * Must also beware of recursion on the node table lock.
1756 * When called from node_cleanup we may already have
1757 * the node table lock held. Unfortunately there's no
1758 * way to separate out this path so we must do this
1759 * conditionally.
1760 */
1761 isowned = IEEE80211_NODE_IS_LOCKED(nt);
1762 if (!isowned)
1763 IEEE80211_NODE_LOCK(nt);
1764 keyix = ni->ni_ucastkey.wk_rxkeyix;
1765 status = ieee80211_crypto_delkey(ic, &ni->ni_ucastkey);
1766 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
1767 nikey = nt->nt_keyixmap[keyix];
1768 nt->nt_keyixmap[keyix] = NULL;
1769 } else
1770 nikey = NULL;
1771 if (!isowned)
1772 IEEE80211_NODE_UNLOCK(&ic->ic_sta);
1773
1774 if (nikey != NULL) {
1775 IASSERT(nikey == ni,
1776 ("key map out of sync, ni %p nikey %p", ni, nikey));
1777 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
1778 "%s: delete key map entry %p<%s> refcnt %d\n",
1779 __func__, ni, ether_sprintf(ni->ni_macaddr),
1780 ieee80211_node_refcnt(ni)-1);
1781 ieee80211_free_node(ni);
1782 }
1783 return status;
1784 }
1785
1786 /*
1787 * Reclaim a node. If this is the last reference count then
1788 * do the normal free work. Otherwise remove it from the node
1789 * table and mark it gone by clearing the back-reference.
1790 */
1791 static void
node_reclaim(struct ieee80211_node_table * nt,struct ieee80211_node * ni)1792 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
1793 {
1794 ieee80211_keyix keyix;
1795
1796 IEEE80211_NODE_LOCK_ASSERT(nt);
1797
1798 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
1799 "%s: remove %p<%s> from %s table, refcnt %d\n",
1800 __func__, ni, ether_sprintf(ni->ni_macaddr),
1801 nt->nt_name, ieee80211_node_refcnt(ni)-1);
1802 /*
1803 * Clear any entry in the unicast key mapping table.
1804 * We need to do it here so rx lookups don't find it
1805 * in the mapping table even if it's not in the hash
1806 * table. We cannot depend on the mapping table entry
1807 * being cleared because the node may not be free'd.
1808 */
1809 keyix = ni->ni_ucastkey.wk_rxkeyix;
1810 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
1811 nt->nt_keyixmap[keyix] == ni) {
1812 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
1813 "%s: %p<%s> clear key map entry\n",
1814 __func__, ni, ether_sprintf(ni->ni_macaddr));
1815 nt->nt_keyixmap[keyix] = NULL;
1816 ieee80211_node_decref(ni); /* NB: don't need free */
1817 }
1818 if (!ieee80211_node_dectestref(ni)) {
1819 /*
1820 * Other references are present, just remove the
1821 * node from the table so it cannot be found. When
1822 * the references are dropped storage will be
1823 * reclaimed.
1824 */
1825 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
1826 LIST_REMOVE(ni, ni_hash);
1827 ni->ni_table = NULL; /* clear reference */
1828 } else
1829 _ieee80211_free_node(ni);
1830 }
1831
1832 static void
ieee80211_free_allnodes_locked(struct ieee80211_node_table * nt)1833 ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt)
1834 {
1835 struct ieee80211com *ic = nt->nt_ic;
1836 struct ieee80211_node *ni;
1837
1838 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1839 "%s: free all nodes in %s table\n", __func__, nt->nt_name);
1840
1841 while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) {
1842 if (ni->ni_associd != 0) {
1843 if (ic->ic_auth->ia_node_leave != NULL)
1844 ic->ic_auth->ia_node_leave(ic, ni);
1845 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
1846 }
1847 node_reclaim(nt, ni);
1848 }
1849 ieee80211_reset_erp(ic);
1850 }
1851
1852 static void
ieee80211_free_allnodes(struct ieee80211_node_table * nt)1853 ieee80211_free_allnodes(struct ieee80211_node_table *nt)
1854 {
1855
1856 IEEE80211_NODE_LOCK(nt);
1857 ieee80211_free_allnodes_locked(nt);
1858 IEEE80211_NODE_UNLOCK(nt);
1859 }
1860
1861 /*
1862 * Timeout entries in the scan cache.
1863 */
1864 static void
ieee80211_timeout_scan_candidates(struct ieee80211_node_table * nt)1865 ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt)
1866 {
1867 struct ieee80211com *ic = nt->nt_ic;
1868 struct ieee80211_node *ni, *tni;
1869
1870 IEEE80211_NODE_LOCK(nt);
1871 ni = ic->ic_bss;
1872 /* XXX belongs elsewhere */
1873 if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) {
1874 m_freem(ni->ni_rxfrag[0]);
1875 ni->ni_rxfrag[0] = NULL;
1876 }
1877 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) {
1878 if (ni->ni_inact && --ni->ni_inact == 0) {
1879 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1880 "[%s] scan candidate purged from cache "
1881 "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr),
1882 ieee80211_node_refcnt(ni));
1883 node_reclaim(nt, ni);
1884 }
1885 }
1886 IEEE80211_NODE_UNLOCK(nt);
1887
1888 nt->nt_inact_timer = IEEE80211_INACT_WAIT;
1889 }
1890
1891 /*
1892 * Timeout inactive stations and do related housekeeping.
1893 * Note that we cannot hold the node lock while sending a
1894 * frame as this would lead to a LOR. Instead we use a
1895 * generation number to mark nodes that we've scanned and
1896 * drop the lock and restart a scan if we have to time out
1897 * a node. Since we are single-threaded by virtue of
1898 * controlling the inactivity timer we can be sure this will
1899 * process each node only once.
1900 */
1901 static void
ieee80211_timeout_stations(struct ieee80211_node_table * nt)1902 ieee80211_timeout_stations(struct ieee80211_node_table *nt)
1903 {
1904 struct ieee80211com *ic = nt->nt_ic;
1905 struct ieee80211_node *ni;
1906 u_int gen;
1907 int isadhoc;
1908
1909 isadhoc = (ic->ic_opmode == IEEE80211_M_IBSS ||
1910 ic->ic_opmode == IEEE80211_M_AHDEMO);
1911 IEEE80211_SCAN_LOCK(nt);
1912 gen = ++nt->nt_scangen;
1913 IEEE80211_SCAN_UNLOCK(nt);
1914 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1915 "%s: %s scangen %u\n", __func__, nt->nt_name, gen);
1916 restart:
1917 IEEE80211_SCAN_LOCK(nt);
1918 if (gen != nt->nt_scangen) {
1919 printf("%s: scan aborted %u\n", __func__, gen);
1920 IEEE80211_SCAN_UNLOCK(nt);
1921 return;
1922 }
1923 IEEE80211_SCAN_UNLOCK(nt);
1924
1925 IEEE80211_NODE_LOCK(nt);
1926 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
1927 if (ni->ni_scangen == gen) /* previously handled */
1928 continue;
1929 ni->ni_scangen = gen;
1930 /*
1931 * Ignore entries for which have yet to receive an
1932 * authentication frame. These are transient and
1933 * will be reclaimed when the last reference to them
1934 * goes away (when frame xmits complete).
1935 */
1936 if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
1937 (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1938 continue;
1939 /*
1940 * Free fragment if not needed anymore
1941 * (last fragment older than 1s).
1942 * XXX doesn't belong here
1943 */
1944 if (ni->ni_rxfrag[0] != NULL &&
1945 ticks > ni->ni_rxfragstamp + hz) {
1946 m_freem(ni->ni_rxfrag[0]);
1947 ni->ni_rxfrag[0] = NULL;
1948 }
1949 /*
1950 * Special case ourself; we may be idle for extended periods
1951 * of time and regardless reclaiming our state is wrong.
1952 */
1953 if (ni == ic->ic_bss)
1954 continue;
1955 ni->ni_inact--;
1956 if (ni->ni_associd != 0 || isadhoc) {
1957 /*
1958 * Age frames on the power save queue. The
1959 * aging interval is 4 times the listen
1960 * interval specified by the station. This
1961 * number is factored into the age calculations
1962 * when the frame is placed on the queue. We
1963 * store ages as time differences we can check
1964 * and/or adjust only the head of the list.
1965 */
1966 if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
1967 struct mbuf *m;
1968 int discard = 0;
1969
1970 IEEE80211_NODE_SAVEQ_LOCK(ni);
1971 while (IF_POLL(&ni->ni_savedq, m) != NULL &&
1972 M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
1973 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/
1974 _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
1975 m_freem(m);
1976 discard++;
1977 }
1978 if (m != NULL)
1979 M_AGE_SUB(m, IEEE80211_INACT_WAIT);
1980 IEEE80211_NODE_SAVEQ_UNLOCK(ni);
1981
1982 if (discard != 0) {
1983 IEEE80211_DPRINTF(ic,
1984 IEEE80211_MSG_POWER,
1985 "[%s] discard %u frames for age\n",
1986 ether_sprintf(ni->ni_macaddr),
1987 discard);
1988 IEEE80211_NODE_STAT_ADD(ni,
1989 ps_discard, discard);
1990 if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0)
1991 ic->ic_set_tim(ni, 0);
1992 }
1993 }
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 if (0 < ni->ni_inact &&
2001 ni->ni_inact <= ic->ic_inact_probe) {
2002 IEEE80211_NOTE(ic,
2003 IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
2004 ni, "%s",
2005 "probe station due to inactivity");
2006 /*
2007 * Grab a reference before unlocking the table
2008 * so the node cannot be reclaimed before we
2009 * send the frame. ieee80211_send_nulldata
2010 * understands we've done this and reclaims the
2011 * ref for us as needed.
2012 */
2013 ieee80211_ref_node(ni);
2014 IEEE80211_NODE_UNLOCK(nt);
2015 ieee80211_send_nulldata(ni);
2016 /* XXX stat? */
2017 goto restart;
2018 }
2019 }
2020 if (ni->ni_inact <= 0) {
2021 IEEE80211_NOTE(ic,
2022 IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
2023 "station timed out due to inactivity "
2024 "(refcnt %u)", ieee80211_node_refcnt(ni));
2025 /*
2026 * Send a deauthenticate frame and drop the station.
2027 * This is somewhat complicated due to reference counts
2028 * and locking. At this point a station will typically
2029 * have a reference count of 1. ieee80211_node_leave
2030 * will do a "free" of the node which will drop the
2031 * reference count. But in the meantime a reference
2032 * will be held by the deauth frame. The actual reclaim
2033 * of the node will happen either after the tx is
2034 * completed or by ieee80211_node_leave.
2035 *
2036 * Separately we must drop the node lock before sending
2037 * in case the driver takes a lock, as this will result
2038 * in LOR between the node lock and the driver lock.
2039 */
2040 IEEE80211_NODE_UNLOCK(nt);
2041 if (ni->ni_associd != 0) {
2042 IEEE80211_SEND_MGMT(ic, ni,
2043 IEEE80211_FC0_SUBTYPE_DEAUTH,
2044 IEEE80211_REASON_AUTH_EXPIRE);
2045 }
2046 ieee80211_node_leave(ic, ni);
2047 ic->ic_stats.is_node_timeout++;
2048 goto restart;
2049 }
2050 }
2051 IEEE80211_NODE_UNLOCK(nt);
2052
2053 nt->nt_inact_timer = IEEE80211_INACT_WAIT;
2054 }
2055
2056 void
ieee80211_iterate_nodes(struct ieee80211_node_table * nt,ieee80211_iter_func * f,void * arg)2057 ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg)
2058 {
2059 struct ieee80211_node *ni;
2060 u_int gen;
2061
2062 IEEE80211_SCAN_LOCK(nt);
2063 gen = ++nt->nt_scangen;
2064 IEEE80211_SCAN_UNLOCK(nt);
2065 restart:
2066 IEEE80211_SCAN_LOCK(nt);
2067 if (gen != nt->nt_scangen) {
2068 printf("%s: scan aborted %u\n", __func__, gen);
2069 IEEE80211_SCAN_UNLOCK(nt);
2070 return;
2071 }
2072 IEEE80211_SCAN_UNLOCK(nt);
2073
2074 IEEE80211_NODE_LOCK(nt);
2075 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
2076 if (ni->ni_scangen != gen) {
2077 ni->ni_scangen = gen;
2078 (void) ieee80211_ref_node(ni);
2079 IEEE80211_NODE_UNLOCK(nt);
2080 (*f)(arg, ni);
2081 ieee80211_free_node(ni);
2082 goto restart;
2083 }
2084 }
2085 IEEE80211_NODE_UNLOCK(nt);
2086 }
2087
2088 void
ieee80211_dump_node(struct ieee80211_node_table * nt,struct ieee80211_node * ni)2089 ieee80211_dump_node(struct ieee80211_node_table *nt,
2090 struct ieee80211_node *ni)
2091 {
2092 printf("0x%p: mac %s refcnt %d\n", ni,
2093 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
2094 printf("\tscangen %u authmode %u flags 0x%x\n",
2095 ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
2096 printf("\tassocid 0x%x txpower %u vlan %u\n",
2097 ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
2098 printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
2099 ni->ni_txseqs[0],
2100 ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT,
2101 ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK,
2102 ni->ni_rxfragstamp);
2103 printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n",
2104 ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo);
2105 printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
2106 ether_sprintf(ni->ni_bssid),
2107 ni->ni_esslen, ni->ni_essid,
2108 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
2109 printf("\tfails %u inact %u txrate %u\n",
2110 ni->ni_fails, ni->ni_inact, ni->ni_txrate);
2111 }
2112
2113 void
ieee80211_dump_nodes(struct ieee80211_node_table * nt)2114 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
2115 {
2116 ieee80211_iterate_nodes(nt,
2117 (ieee80211_iter_func *) ieee80211_dump_node, nt);
2118 }
2119
2120 /*
2121 * Handle a station joining an 11g network.
2122 */
2123 static void
ieee80211_node_join_11g(struct ieee80211com * ic,struct ieee80211_node * ni)2124 ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
2125 {
2126
2127 /*
2128 * Station isn't capable of short slot time. Bump
2129 * the count of long slot time stations and disable
2130 * use of short slot time. Note that the actual switch
2131 * over to long slot time use may not occur until the
2132 * next beacon transmission (per sec. 7.3.1.4 of 11g).
2133 */
2134 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
2135 ic->ic_longslotsta++;
2136 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2137 "[%s] station needs long slot time, count %d\n",
2138 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta);
2139 /* XXX vap's w/ conflicting needs won't work */
2140 ieee80211_set_shortslottime(ic, 0);
2141 }
2142 /*
2143 * If the new station is not an ERP station
2144 * then bump the counter and enable protection
2145 * if configured.
2146 */
2147 if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) {
2148 ic->ic_nonerpsta++;
2149 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2150 "[%s] station is !ERP, %d non-ERP stations associated\n",
2151 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta);
2152 /*
2153 * If protection is configured, enable it.
2154 */
2155 if (ic->ic_protmode != IEEE80211_PROT_NONE) {
2156 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2157 "%s: enable use of protection\n", __func__);
2158 ic->ic_flags |= IEEE80211_F_USEPROT;
2159 }
2160 /*
2161 * If station does not support short preamble
2162 * then we must enable use of Barker preamble.
2163 */
2164 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
2165 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2166 "[%s] station needs long preamble\n",
2167 ether_sprintf(ni->ni_macaddr));
2168 ic->ic_flags |= IEEE80211_F_USEBARKER;
2169 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
2170 }
2171 } else
2172 ni->ni_flags |= IEEE80211_NODE_ERP;
2173 }
2174
2175 void
ieee80211_node_join(struct ieee80211com * ic,struct ieee80211_node * ni,int resp)2176 ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp)
2177 {
2178 int newassoc;
2179
2180 if (ni->ni_associd == 0) {
2181 u_int16_t aid;
2182
2183 /*
2184 * It would be good to search the bitmap
2185 * more efficiently, but this will do for now.
2186 */
2187 for (aid = 1; aid < ic->ic_max_aid; aid++) {
2188 if (!IEEE80211_AID_ISSET(aid,
2189 ic->ic_aid_bitmap))
2190 break;
2191 }
2192 if (aid >= ic->ic_max_aid) {
2193 IEEE80211_SEND_MGMT(ic, ni, resp,
2194 IEEE80211_REASON_ASSOC_TOOMANY);
2195 ieee80211_node_leave(ic, ni);
2196 return;
2197 }
2198 ni->ni_associd = aid | 0xc000;
2199 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap);
2200 ic->ic_sta_assoc++;
2201 newassoc = 1;
2202 if (ic->ic_curmode == IEEE80211_MODE_11G)
2203 ieee80211_node_join_11g(ic, ni);
2204 } else
2205 newassoc = 0;
2206
2207 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG,
2208 "[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n",
2209 ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re",
2210 IEEE80211_NODE_AID(ni),
2211 ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
2212 ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
2213 ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
2214 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : ""
2215 );
2216
2217 /* give driver a chance to setup state like ni_txrate */
2218 if (ic->ic_newassoc != NULL)
2219 ic->ic_newassoc(ni, newassoc);
2220 ni->ni_inact_reload = ic->ic_inact_auth;
2221 ni->ni_inact = ni->ni_inact_reload;
2222 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
2223 /* tell the authenticator about new station */
2224 if (ic->ic_auth->ia_node_join != NULL)
2225 ic->ic_auth->ia_node_join(ic, ni);
2226 ieee80211_notify_node_join(ic, ni, newassoc);
2227 }
2228
2229 /*
2230 * Handle a station leaving an 11g network.
2231 */
2232 static void
ieee80211_node_leave_11g(struct ieee80211com * ic,struct ieee80211_node * ni)2233 ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
2234 {
2235
2236 IASSERT(ic->ic_curmode == IEEE80211_MODE_11G,
2237 ("not in 11g, bss %u:0x%x, curmode %u", ni->ni_chan->ic_freq,
2238 ni->ni_chan->ic_flags, ic->ic_curmode));
2239
2240 /*
2241 * If a long slot station do the slot time bookkeeping.
2242 */
2243 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
2244 IASSERT(ic->ic_longslotsta > 0,
2245 ("bogus long slot station count %d", ic->ic_longslotsta));
2246 ic->ic_longslotsta--;
2247 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2248 "[%s] long slot time station leaves, count now %d\n",
2249 ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta);
2250 if (ic->ic_longslotsta == 0) {
2251 /*
2252 * Re-enable use of short slot time if supported
2253 * and not operating in IBSS mode (per spec).
2254 */
2255 if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
2256 ic->ic_opmode != IEEE80211_M_IBSS) {
2257 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2258 "%s: re-enable use of short slot time\n",
2259 __func__);
2260 ieee80211_set_shortslottime(ic, 1);
2261 }
2262 }
2263 }
2264 /*
2265 * If a non-ERP station do the protection-related bookkeeping.
2266 */
2267 if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
2268 IASSERT(ic->ic_nonerpsta > 0,
2269 ("bogus non-ERP station count %d", ic->ic_nonerpsta));
2270 ic->ic_nonerpsta--;
2271 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2272 "[%s] non-ERP station leaves, count now %d\n",
2273 ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta);
2274 if (ic->ic_nonerpsta == 0) {
2275 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2276 "%s: disable use of protection\n", __func__);
2277 ic->ic_flags &= ~IEEE80211_F_USEPROT;
2278 /* XXX verify mode? */
2279 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
2280 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
2281 "%s: re-enable use of short preamble\n",
2282 __func__);
2283 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
2284 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
2285 }
2286 }
2287 }
2288 }
2289
2290 /*
2291 * Handle bookkeeping for station deauthentication/disassociation
2292 * when operating as an ap.
2293 */
2294 void
ieee80211_node_leave(struct ieee80211com * ic,struct ieee80211_node * ni)2295 ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
2296 {
2297 struct ieee80211_node_table *nt = ni->ni_table;
2298
2299 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG,
2300 "[%s] station with aid %d leaves\n",
2301 ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni));
2302
2303 IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP ||
2304 ic->ic_opmode == IEEE80211_M_IBSS ||
2305 ic->ic_opmode == IEEE80211_M_AHDEMO,
2306 ("unexpected operating mode %u", ic->ic_opmode));
2307 /*
2308 * If node wasn't previously associated all
2309 * we need to do is reclaim the reference.
2310 */
2311 /* XXX ibss mode bypasses 11g and notification */
2312 if (ni->ni_associd == 0)
2313 goto done;
2314 /*
2315 * Tell the authenticator the station is leaving.
2316 * Note that we must do this before yanking the
2317 * association id as the authenticator uses the
2318 * associd to locate its state block.
2319 */
2320 if (ic->ic_auth->ia_node_leave != NULL)
2321 ic->ic_auth->ia_node_leave(ic, ni);
2322 IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
2323 ni->ni_associd = 0;
2324 ic->ic_sta_assoc--;
2325
2326 if (ic->ic_curmode == IEEE80211_MODE_11G)
2327 ieee80211_node_leave_11g(ic, ni);
2328 /*
2329 * Cleanup station state. In particular clear various
2330 * state that might otherwise be reused if the node
2331 * is reused before the reference count goes to zero
2332 * (and memory is reclaimed).
2333 */
2334 ieee80211_sta_leave(ic, ni);
2335 done:
2336 /*
2337 * Remove the node from any table it's recorded in and
2338 * drop the caller's reference. Removal from the table
2339 * is important to insure the node is not reprocessed
2340 * for inactivity.
2341 */
2342 if (nt != NULL) {
2343 IEEE80211_NODE_LOCK(nt);
2344 node_reclaim(nt, ni);
2345 IEEE80211_NODE_UNLOCK(nt);
2346 } else
2347 ieee80211_free_node(ni);
2348 }
2349
2350 u_int8_t
ieee80211_getrssi(struct ieee80211com * ic)2351 ieee80211_getrssi(struct ieee80211com *ic)
2352 {
2353 #define NZ(x) ((x) == 0 ? 1 : (x))
2354 struct ieee80211_node_table *nt = &ic->ic_sta;
2355 u_int32_t rssi_samples, rssi_total;
2356 struct ieee80211_node *ni;
2357
2358 rssi_total = 0;
2359 rssi_samples = 0;
2360 switch (ic->ic_opmode) {
2361 case IEEE80211_M_IBSS: /* average of all ibss neighbors */
2362 /* XXX locking */
2363 TAILQ_FOREACH(ni, &nt->nt_node, ni_list)
2364 if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) {
2365 rssi_samples++;
2366 rssi_total += ic->ic_node_getrssi(ni);
2367 }
2368 break;
2369 case IEEE80211_M_AHDEMO: /* average of all neighbors */
2370 /* XXX locking */
2371 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
2372 rssi_samples++;
2373 rssi_total += ic->ic_node_getrssi(ni);
2374 }
2375 break;
2376 case IEEE80211_M_HOSTAP: /* average of all associated stations */
2377 #ifndef IEEE80211_NO_HOSTAP
2378 /* XXX locking */
2379 TAILQ_FOREACH(ni, &nt->nt_node, ni_list)
2380 if (IEEE80211_AID(ni->ni_associd) != 0) {
2381 rssi_samples++;
2382 rssi_total += ic->ic_node_getrssi(ni);
2383 }
2384 #endif /* !IEEE80211_NO_HOSTAP */
2385 break;
2386 case IEEE80211_M_MONITOR: /* XXX */
2387 case IEEE80211_M_STA: /* use stats from associated ap */
2388 default:
2389 if (ic->ic_bss != NULL)
2390 rssi_total = ic->ic_node_getrssi(ic->ic_bss);
2391 rssi_samples = 1;
2392 break;
2393 }
2394 return rssi_total / NZ(rssi_samples);
2395 #undef NZ
2396 }
2397
2398 /*
2399 * Indicate whether there are frames queued for a station in power-save mode.
2400 */
2401 static void
ieee80211_set_tim(struct ieee80211_node * ni,int set)2402 ieee80211_set_tim(struct ieee80211_node *ni, int set)
2403 {
2404 struct ieee80211com *ic = ni->ni_ic;
2405 u_int16_t aid;
2406
2407 IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP ||
2408 ic->ic_opmode == IEEE80211_M_IBSS,
2409 ("operating mode %u", ic->ic_opmode));
2410
2411 aid = IEEE80211_AID(ni->ni_associd);
2412 IASSERT(aid < ic->ic_max_aid,
2413 ("bogus aid %u, max %u", aid, ic->ic_max_aid));
2414
2415 IEEE80211_BEACON_LOCK(ic);
2416 if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) {
2417 if (set) {
2418 setbit(ic->ic_tim_bitmap, aid);
2419 ic->ic_ps_pending++;
2420 } else {
2421 clrbit(ic->ic_tim_bitmap, aid);
2422 ic->ic_ps_pending--;
2423 }
2424 ic->ic_flags |= IEEE80211_F_TIMUPDATE;
2425 }
2426 IEEE80211_BEACON_UNLOCK(ic);
2427 }
2428
2429 /*
2430 * Node table support.
2431 */
2432
2433 static void
ieee80211_node_table_init(struct ieee80211com * ic,struct ieee80211_node_table * nt,const char * name,int inact,int keyixmax,void (* timeout)(struct ieee80211_node_table *))2434 ieee80211_node_table_init(struct ieee80211com *ic,
2435 struct ieee80211_node_table *nt,
2436 const char *name, int inact, int keyixmax,
2437 void (*timeout)(struct ieee80211_node_table *))
2438 {
2439
2440 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
2441 "%s %s table, inact %u\n", __func__, name, inact);
2442
2443 nt->nt_ic = ic;
2444 /* XXX need unit */
2445 IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname);
2446 IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname);
2447 TAILQ_INIT(&nt->nt_node);
2448 nt->nt_name = name;
2449 nt->nt_scangen = 1;
2450 nt->nt_inact_init = inact;
2451 nt->nt_timeout = timeout;
2452 nt->nt_keyixmax = keyixmax;
2453 if (nt->nt_keyixmax > 0) {
2454 nt->nt_keyixmap = malloc(keyixmax *
2455 sizeof(struct ieee80211_node *), M_80211_NODE,
2456 M_NOWAIT | M_ZERO);
2457 if (nt->nt_keyixmap == NULL)
2458 if_printf(ic->ic_ifp,
2459 "Cannot allocate key index map with %u entries\n",
2460 keyixmax);
2461 } else
2462 nt->nt_keyixmap = NULL;
2463 }
2464
2465 void
ieee80211_node_table_reset(struct ieee80211_node_table * nt)2466 ieee80211_node_table_reset(struct ieee80211_node_table *nt)
2467 {
2468
2469 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
2470 "%s %s table\n", __func__, nt->nt_name);
2471
2472 IEEE80211_NODE_LOCK(nt);
2473 nt->nt_inact_timer = 0;
2474 ieee80211_free_allnodes_locked(nt);
2475 IEEE80211_NODE_UNLOCK(nt);
2476 }
2477
2478 static void
ieee80211_node_table_cleanup(struct ieee80211_node_table * nt)2479 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
2480 {
2481
2482 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
2483 "%s %s table\n", __func__, nt->nt_name);
2484
2485 IEEE80211_NODE_LOCK(nt);
2486 ieee80211_free_allnodes_locked(nt);
2487 IEEE80211_NODE_UNLOCK(nt);
2488 if (nt->nt_keyixmap != NULL) {
2489 /* XXX verify all entries are NULL */
2490 int i;
2491 for (i = 0; i < nt->nt_keyixmax; i++)
2492 if (nt->nt_keyixmap[i] != NULL)
2493 printf("%s: %s[%u] still active\n", __func__,
2494 nt->nt_name, i);
2495 free(nt->nt_keyixmap, M_80211_NODE);
2496 nt->nt_keyixmap = NULL;
2497 }
2498 IEEE80211_SCAN_LOCK_DESTROY(nt);
2499 IEEE80211_NODE_LOCK_DESTROY(nt);
2500 }
2501