1/*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2005 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 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/net80211/ieee80211.c 148936 2005-08-10 16:22:30Z sam $");
35
36/*
37 * IEEE 802.11 generic handler
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43
44#include <sys/socket.h>
45
46#include <net/if.h>
47#include <net/if_media.h>
48#include <net/ethernet.h>
49
50#include <net80211/ieee80211_var.h>
51
52#include <net/bpf.h>
53
54const char *ieee80211_phymode_name[] = {
55 "auto", /* IEEE80211_MODE_AUTO */
56 "11a", /* IEEE80211_MODE_11A */
57 "11b", /* IEEE80211_MODE_11B */
58 "11g", /* IEEE80211_MODE_11G */
59 "FH", /* IEEE80211_MODE_FH */
60 "turboA", /* IEEE80211_MODE_TURBO_A */
61 "turboG", /* IEEE80211_MODE_TURBO_G */
62};
63
64/* list of all instances */
65SLIST_HEAD(ieee80211_list, ieee80211com);
66static struct ieee80211_list ieee80211_list =
67 SLIST_HEAD_INITIALIZER(ieee80211_list);
68static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */
69static struct mtx ieee80211_vap_mtx;
70MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF);
71
72static void
73ieee80211_add_vap(struct ieee80211com *ic)
74{
75#define N(a) (sizeof(a)/sizeof(a[0]))
76 int i;
77 u_int8_t b;
78
79 mtx_lock(&ieee80211_vap_mtx);
80 ic->ic_vap = 0;
81 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++)
82 ic->ic_vap += NBBY;
83 if (i == N(ieee80211_vapmap))
84 panic("vap table full");
85 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1)
86 ic->ic_vap++;
87 setbit(ieee80211_vapmap, ic->ic_vap);
88 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next);
89 mtx_unlock(&ieee80211_vap_mtx);
90#undef N
91}
92
93static void
94ieee80211_remove_vap(struct ieee80211com *ic)
95{
96 mtx_lock(&ieee80211_vap_mtx);
97 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next);
98 KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY,
99 ("invalid vap id %d", ic->ic_vap));
100 KASSERT(isset(ieee80211_vapmap, ic->ic_vap),
101 ("vap id %d not allocated", ic->ic_vap));
102 clrbit(ieee80211_vapmap, ic->ic_vap);
103 mtx_unlock(&ieee80211_vap_mtx);
104}
105
106/*
107 * Default reset method for use with the ioctl support. This
108 * method is invoked after any state change in the 802.11
109 * layer that should be propagated to the hardware but not
110 * require re-initialization of the 802.11 state machine (e.g
111 * rescanning for an ap). We always return ENETRESET which
112 * should cause the driver to re-initialize the device. Drivers
113 * can override this method to implement more optimized support.
114 */
115static int
116ieee80211_default_reset(struct ifnet *ifp)
117{
118 return ENETRESET;
119}
120
121void
122ieee80211_ifattach(struct ieee80211com *ic)
123{
124 struct ifnet *ifp = ic->ic_ifp;
125 struct ieee80211_channel *c;
126 int i;
127
128 ether_ifattach(ifp, ic->ic_myaddr);
129 bpfattach2(ifp, DLT_IEEE802_11,
130 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
131
132 ieee80211_crypto_attach(ic);
133
134 /*
135 * Fill in 802.11 available channel set, mark
136 * all available channels as active, and pick
137 * a default channel if not already specified.
138 */
139 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
140 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
141 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
142 c = &ic->ic_channels[i];
143 if (c->ic_flags) {
144 /*
145 * Verify driver passed us valid data.
146 */
147 if (i != ieee80211_chan2ieee(ic, c)) {
148 if_printf(ifp, "bad channel ignored; "
149 "freq %u flags %x number %u\n",
150 c->ic_freq, c->ic_flags, i);
151 c->ic_flags = 0; /* NB: remove */
152 continue;
153 }
154 setbit(ic->ic_chan_avail, i);
155 /*
156 * Identify mode capabilities.
157 */
158 if (IEEE80211_IS_CHAN_A(c))
159 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
160 if (IEEE80211_IS_CHAN_B(c))
161 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
162 if (IEEE80211_IS_CHAN_PUREG(c))
163 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
164 if (IEEE80211_IS_CHAN_FHSS(c))
165 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
166 if (IEEE80211_IS_CHAN_T(c))
167 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A;
168 if (IEEE80211_IS_CHAN_108G(c))
169 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G;
170 if (ic->ic_curchan == NULL) {
171 /* arbitrarily pick the first channel */
172 ic->ic_curchan = &ic->ic_channels[i];
173 }
174 }
175 }
176 /* validate ic->ic_curmode */
177 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
178 ic->ic_curmode = IEEE80211_MODE_AUTO;
179 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
180#if 0
181 /*
182 * Enable WME by default if we're capable.
183 */
184 if (ic->ic_caps & IEEE80211_C_WME)
185 ic->ic_flags |= IEEE80211_F_WME;
186#endif
187 (void) ieee80211_setmode(ic, ic->ic_curmode);
188
189 if (ic->ic_bintval == 0)
190 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
191 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */
192 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT;
193 IEEE80211_BEACON_LOCK_INIT(ic, "beacon");
194
195 if (ic->ic_lintval == 0)
196 ic->ic_lintval = ic->ic_bintval;
197 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
198
199 ieee80211_node_attach(ic);
200 ieee80211_proto_attach(ic);
201
202 ieee80211_add_vap(ic);
203
204 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */
205
206 /*
207 * Install a default reset method for the ioctl support.
208 * The driver is expected to fill this in before calling us.
209 */
210 if (ic->ic_reset == NULL)
211 ic->ic_reset = ieee80211_default_reset;
212}
213
214void
215ieee80211_ifdetach(struct ieee80211com *ic)
216{
217 struct ifnet *ifp = ic->ic_ifp;
218
219 ieee80211_remove_vap(ic);
220
221 ieee80211_sysctl_detach(ic);
222 ieee80211_proto_detach(ic);
223 ieee80211_crypto_detach(ic);
224 ieee80211_node_detach(ic);
225 ifmedia_removeall(&ic->ic_media);
226
227 IEEE80211_BEACON_LOCK_DESTROY(ic);
228
229 bpfdetach(ifp);
230 ether_ifdetach(ifp);
231}
232
233/*
234 * Convert MHz frequency to IEEE channel number.
235 */
236u_int
237ieee80211_mhz2ieee(u_int freq, u_int flags)
238{
239 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
240 if (freq == 2484)
241 return 14;
242 if (freq < 2484)
243 return (freq - 2407) / 5;
244 else
245 return 15 + ((freq - 2512) / 20);
246 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
247 return (freq - 5000) / 5;
248 } else { /* either, guess */
249 if (freq == 2484)
250 return 14;
251 if (freq < 2484)
252 return (freq - 2407) / 5;
253 if (freq < 5000)
254 return 15 + ((freq - 2512) / 20);
255 return (freq - 5000) / 5;
256 }
257}
258
259/*
260 * Convert channel to IEEE channel number.
261 */
262u_int
263ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
264{
265 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
266 return c - ic->ic_channels;
267 else if (c == IEEE80211_CHAN_ANYC)
268 return IEEE80211_CHAN_ANY;
269 else if (c != NULL) {
270 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n",
271 c->ic_freq, c->ic_flags);
272 return 0; /* XXX */
273 } else {
274 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
275 return 0; /* XXX */
276 }
277}
278
279/*
280 * Convert IEEE channel number to MHz frequency.
281 */
282u_int
283ieee80211_ieee2mhz(u_int chan, u_int flags)
284{
285 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
286 if (chan == 14)
287 return 2484;
288 if (chan < 14)
289 return 2407 + chan*5;
290 else
291 return 2512 + ((chan-15)*20);
292 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
293 return 5000 + (chan*5);
294 } else { /* either, guess */
295 if (chan == 14)
296 return 2484;
297 if (chan < 14) /* 0-13 */
298 return 2407 + chan*5;
299 if (chan < 27) /* 15-26 */
300 return 2512 + ((chan-15)*20);
301 return 5000 + (chan*5);
302 }
303}
304
305/*
306 * Setup the media data structures according to the channel and
307 * rate tables. This must be called by the driver after
308 * ieee80211_attach and before most anything else.
309 */
310void
311ieee80211_media_init(struct ieee80211com *ic,
312 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
313{
314#define ADD(_ic, _s, _o) \
315 ifmedia_add(&(_ic)->ic_media, \
316 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
317 struct ifnet *ifp = ic->ic_ifp;
318 struct ifmediareq imr;
319 int i, j, mode, rate, maxrate, mword, mopt, r;
320 struct ieee80211_rateset *rs;
321 struct ieee80211_rateset allrates;
322
323 /*
324 * Do late attach work that must wait for any subclass
325 * (i.e. driver) work such as overriding methods.
326 */
327 ieee80211_node_lateattach(ic);
328
329 /*
330 * Fill in media characteristics.
331 */
332 ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
333 maxrate = 0;
334 memset(&allrates, 0, sizeof(allrates));
335 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
336 static const u_int mopts[] = {
337 IFM_AUTO,
338 IFM_IEEE80211_11A,
339 IFM_IEEE80211_11B,
340 IFM_IEEE80211_11G,
341 IFM_IEEE80211_FH,
342 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
343 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO,
344 };
345 if ((ic->ic_modecaps & (1<<mode)) == 0)
346 continue;
347 mopt = mopts[mode];
348 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
349 if (ic->ic_caps & IEEE80211_C_IBSS)
350 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
351 if (ic->ic_caps & IEEE80211_C_HOSTAP)
352 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
353 if (ic->ic_caps & IEEE80211_C_AHDEMO)
354 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
355 if (ic->ic_caps & IEEE80211_C_MONITOR)
356 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
357 if (mode == IEEE80211_MODE_AUTO)
358 continue;
359 rs = &ic->ic_sup_rates[mode];
360 for (i = 0; i < rs->rs_nrates; i++) {
361 rate = rs->rs_rates[i];
362 mword = ieee80211_rate2media(ic, rate, mode);
363 if (mword == 0)
364 continue;
365 ADD(ic, mword, mopt);
366 if (ic->ic_caps & IEEE80211_C_IBSS)
367 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
368 if (ic->ic_caps & IEEE80211_C_HOSTAP)
369 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
370 if (ic->ic_caps & IEEE80211_C_AHDEMO)
371 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
372 if (ic->ic_caps & IEEE80211_C_MONITOR)
373 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
374 /*
375 * Add rate to the collection of all rates.
376 */
377 r = rate & IEEE80211_RATE_VAL;
378 for (j = 0; j < allrates.rs_nrates; j++)
379 if (allrates.rs_rates[j] == r)
380 break;
381 if (j == allrates.rs_nrates) {
382 /* unique, add to the set */
383 allrates.rs_rates[j] = r;
384 allrates.rs_nrates++;
385 }
386 rate = (rate & IEEE80211_RATE_VAL) / 2;
387 if (rate > maxrate)
388 maxrate = rate;
389 }
390 }
391 for (i = 0; i < allrates.rs_nrates; i++) {
392 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
393 IEEE80211_MODE_AUTO);
394 if (mword == 0)
395 continue;
396 mword = IFM_SUBTYPE(mword); /* remove media options */
397 ADD(ic, mword, 0);
398 if (ic->ic_caps & IEEE80211_C_IBSS)
399 ADD(ic, mword, IFM_IEEE80211_ADHOC);
400 if (ic->ic_caps & IEEE80211_C_HOSTAP)
401 ADD(ic, mword, IFM_IEEE80211_HOSTAP);
402 if (ic->ic_caps & IEEE80211_C_AHDEMO)
403 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
404 if (ic->ic_caps & IEEE80211_C_MONITOR)
405 ADD(ic, mword, IFM_IEEE80211_MONITOR);
406 }
407 ieee80211_media_status(ifp, &imr);
408 ifmedia_set(&ic->ic_media, imr.ifm_active);
409
410 if (maxrate)
411 ifp->if_baudrate = IF_Mbps(maxrate);
412#undef ADD
413}
414
415void
416ieee80211_announce(struct ieee80211com *ic)
417{
418 struct ifnet *ifp = ic->ic_ifp;
419 int i, mode, rate, mword;
420 struct ieee80211_rateset *rs;
421
422 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) {
423 if ((ic->ic_modecaps & (1<<mode)) == 0)
424 continue;
425 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
426 rs = &ic->ic_sup_rates[mode];
427 for (i = 0; i < rs->rs_nrates; i++) {
428 rate = rs->rs_rates[i];
429 mword = ieee80211_rate2media(ic, rate, mode);
430 if (mword == 0)
431 continue;
432 printf("%s%d%sMbps", (i != 0 ? " " : ""),
433 (rate & IEEE80211_RATE_VAL) / 2,
434 ((rate & 0x1) != 0 ? ".5" : ""));
435 }
436 printf("\n");
437 }
438}
439
440static int
441findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
442{
443#define IEEERATE(_ic,_m,_i) \
444 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
445 int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
446 for (i = 0; i < nrates; i++)
447 if (IEEERATE(ic, mode, i) == rate)
448 return i;
449 return -1;
450#undef IEEERATE
451}
452
453/*
454 * Find an instance by it's mac address.
455 */
456struct ieee80211com *
457ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN])
458{
459 struct ieee80211com *ic;
460
461 /* XXX lock */
462 SLIST_FOREACH(ic, &ieee80211_list, ic_next)
463 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr))
464 return ic;
465 return NULL;
466}
467
468static struct ieee80211com *
469ieee80211_find_instance(struct ifnet *ifp)
470{
471 struct ieee80211com *ic;
472
473 /* XXX lock */
474 /* XXX not right for multiple instances but works for now */
475 SLIST_FOREACH(ic, &ieee80211_list, ic_next)
476 if (ic->ic_ifp == ifp)
477 return ic;
478 return NULL;
479}
480
481/*
482 * Handle a media change request.
483 */
484int
485ieee80211_media_change(struct ifnet *ifp)
486{
487 struct ieee80211com *ic;
488 struct ifmedia_entry *ime;
489 enum ieee80211_opmode newopmode;
490 enum ieee80211_phymode newphymode;
491 int i, j, newrate, error = 0;
492
493 ic = ieee80211_find_instance(ifp);
494 if (!ic) {
495 if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
496 return EINVAL;
497 }
498 ime = ic->ic_media.ifm_cur;
499 /*
500 * First, identify the phy mode.
501 */
502 switch (IFM_MODE(ime->ifm_media)) {
503 case IFM_IEEE80211_11A:
504 newphymode = IEEE80211_MODE_11A;
505 break;
506 case IFM_IEEE80211_11B:
507 newphymode = IEEE80211_MODE_11B;
508 break;
509 case IFM_IEEE80211_11G:
510 newphymode = IEEE80211_MODE_11G;
511 break;
512 case IFM_IEEE80211_FH:
513 newphymode = IEEE80211_MODE_FH;
514 break;
515 case IFM_AUTO:
516 newphymode = IEEE80211_MODE_AUTO;
517 break;
518 default:
519 return EINVAL;
520 }
521 /*
522 * Turbo mode is an ``option''.
523 * XXX does not apply to AUTO
524 */
525 if (ime->ifm_media & IFM_IEEE80211_TURBO) {
526 if (newphymode == IEEE80211_MODE_11A)
527 newphymode = IEEE80211_MODE_TURBO_A;
528 else if (newphymode == IEEE80211_MODE_11G)
529 newphymode = IEEE80211_MODE_TURBO_G;
530 else
531 return EINVAL;
532 }
533 /*
534 * Validate requested mode is available.
535 */
536 if ((ic->ic_modecaps & (1<<newphymode)) == 0)
537 return EINVAL;
538
539 /*
540 * Next, the fixed/variable rate.
541 */
542 i = -1;
543 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
544 /*
545 * Convert media subtype to rate.
546 */
547 newrate = ieee80211_media2rate(ime->ifm_media);
548 if (newrate == 0)
549 return EINVAL;
550 /*
551 * Check the rate table for the specified/current phy.
552 */
553 if (newphymode == IEEE80211_MODE_AUTO) {
554 /*
555 * In autoselect mode search for the rate.
556 */
557 for (j = IEEE80211_MODE_11A;
558 j < IEEE80211_MODE_MAX; j++) {
559 if ((ic->ic_modecaps & (1<<j)) == 0)
560 continue;
561 i = findrate(ic, j, newrate);
562 if (i != -1) {
563 /* lock mode too */
564 newphymode = j;
565 break;
566 }
567 }
568 } else {
569 i = findrate(ic, newphymode, newrate);
570 }
571 if (i == -1) /* mode/rate mismatch */
572 return EINVAL;
573 }
574 /* NB: defer rate setting to later */
575
576 /*
577 * Deduce new operating mode but don't install it just yet.
578 */
579 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
580 (IFM_IEEE80211_ADHOC|IFM_FLAG0))
581 newopmode = IEEE80211_M_AHDEMO;
582 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
583 newopmode = IEEE80211_M_HOSTAP;
584 else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
585 newopmode = IEEE80211_M_IBSS;
586 else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
587 newopmode = IEEE80211_M_MONITOR;
588 else
589 newopmode = IEEE80211_M_STA;
590
591 /*
592 * Autoselect doesn't make sense when operating as an AP.
593 * If no phy mode has been selected, pick one and lock it
594 * down so rate tables can be used in forming beacon frames
595 * and the like.
596 */
597 if (newopmode == IEEE80211_M_HOSTAP &&
598 newphymode == IEEE80211_MODE_AUTO) {
599 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
600 if (ic->ic_modecaps & (1<<j)) {
601 newphymode = j;
602 break;
603 }
604 }
605
606 /*
607 * Handle phy mode change.
608 */
609 if (ic->ic_curmode != newphymode) { /* change phy mode */
610 error = ieee80211_setmode(ic, newphymode);
611 if (error != 0)
612 return error;
613 error = ENETRESET;
614 }
615
616 /*
617 * Committed to changes, install the rate setting.
618 */
619 if (ic->ic_fixed_rate != i) {
620 ic->ic_fixed_rate = i; /* set fixed tx rate */
621 error = ENETRESET;
622 }
623
624 /*
625 * Handle operating mode change.
626 */
627 if (ic->ic_opmode != newopmode) {
628 ic->ic_opmode = newopmode;
629 switch (newopmode) {
630 case IEEE80211_M_AHDEMO:
631 case IEEE80211_M_HOSTAP:
632 case IEEE80211_M_STA:
633 case IEEE80211_M_MONITOR:
634 ic->ic_flags &= ~IEEE80211_F_IBSSON;
635 break;
636 case IEEE80211_M_IBSS:
637 ic->ic_flags |= IEEE80211_F_IBSSON;
638 break;
639 }
640 /*
641 * Yech, slot time may change depending on the
642 * operating mode so reset it to be sure everything
643 * is setup appropriately.
644 */
645 ieee80211_reset_erp(ic);
646 ieee80211_wme_initparams(ic); /* after opmode change */
647 error = ENETRESET;
648 }
649#ifdef notdef
650 if (error == 0)
651 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
652#endif
653 return error;
654}
655
656void
657ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
658{
659 struct ieee80211com *ic;
660 struct ieee80211_rateset *rs;
661
662 ic = ieee80211_find_instance(ifp);
663 if (!ic) {
664 if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
665 return;
666 }
667 imr->ifm_status = IFM_AVALID;
668 imr->ifm_active = IFM_IEEE80211;
669 if (ic->ic_state == IEEE80211_S_RUN)
670 imr->ifm_status |= IFM_ACTIVE;
671 /*
672 * Calculate a current rate if possible.
673 */
674 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
675 /*
676 * A fixed rate is set, report that.
677 */
678 rs = &ic->ic_sup_rates[ic->ic_curmode];
679 imr->ifm_active |= ieee80211_rate2media(ic,
680 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode);
681 } else if (ic->ic_opmode == IEEE80211_M_STA) {
682 /*
683 * In station mode report the current transmit rate.
684 */
685 rs = &ic->ic_bss->ni_rates;
686 imr->ifm_active |= ieee80211_rate2media(ic,
687 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode);
688 } else
689 imr->ifm_active |= IFM_AUTO;
690 switch (ic->ic_opmode) {
691 case IEEE80211_M_STA:
692 break;
693 case IEEE80211_M_IBSS:
694 imr->ifm_active |= IFM_IEEE80211_ADHOC;
695 break;
696 case IEEE80211_M_AHDEMO:
697 /* should not come here */
698 break;
699 case IEEE80211_M_HOSTAP:
700 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
701 break;
702 case IEEE80211_M_MONITOR:
703 imr->ifm_active |= IFM_IEEE80211_MONITOR;
704 break;
705 }
706 switch (ic->ic_curmode) {
707 case IEEE80211_MODE_11A:
708 imr->ifm_active |= IFM_IEEE80211_11A;
709 break;
710 case IEEE80211_MODE_11B:
711 imr->ifm_active |= IFM_IEEE80211_11B;
712 break;
713 case IEEE80211_MODE_11G:
714 imr->ifm_active |= IFM_IEEE80211_11G;
715 break;
716 case IEEE80211_MODE_FH:
717 imr->ifm_active |= IFM_IEEE80211_FH;
718 break;
719 case IEEE80211_MODE_TURBO_A:
720 imr->ifm_active |= IFM_IEEE80211_11A
721 | IFM_IEEE80211_TURBO;
722 break;
723 case IEEE80211_MODE_TURBO_G:
724 imr->ifm_active |= IFM_IEEE80211_11G
725 | IFM_IEEE80211_TURBO;
726 break;
727 }
728}
729
730void
731ieee80211_watchdog(struct ieee80211com *ic)
732{
733 struct ieee80211_node_table *nt;
734 int need_inact_timer = 0;
735
736 if (ic->ic_state != IEEE80211_S_INIT) {
737 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
738 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0);
739 nt = &ic->ic_scan;
740 if (nt->nt_inact_timer) {
741 if (--nt->nt_inact_timer == 0)
742 nt->nt_timeout(nt);
743 need_inact_timer += nt->nt_inact_timer;
744 }
745 nt = &ic->ic_sta;
746 if (nt->nt_inact_timer) {
747 if (--nt->nt_inact_timer == 0)
748 nt->nt_timeout(nt);
749 need_inact_timer += nt->nt_inact_timer;
750 }
751 }
752 if (ic->ic_mgt_timer != 0 || need_inact_timer)
753 ic->ic_ifp->if_timer = 1;
754}
755
756/*
757 * Set the current phy mode and recalculate the active channel
758 * set based on the available channels for this mode. Also
759 * select a new default/current channel if the current one is
760 * inappropriate for this mode.
761 */
762int
763ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
764{
765#define N(a) (sizeof(a) / sizeof(a[0]))
766 static const u_int chanflags[] = {
767 0, /* IEEE80211_MODE_AUTO */
768 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
769 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
770 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
771 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */
772 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */
773 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */
774 };
775 struct ieee80211_channel *c;
776 u_int modeflags;
777 int i;
778
779 /* validate new mode */
780 if ((ic->ic_modecaps & (1<<mode)) == 0) {
781 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
782 "%s: mode %u not supported (caps 0x%x)\n",
783 __func__, mode, ic->ic_modecaps);
784 return EINVAL;
785 }
786
787 /*
788 * Verify at least one channel is present in the available
789 * channel list before committing to the new mode.
790 */
791 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode));
792 modeflags = chanflags[mode];
793 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
794 c = &ic->ic_channels[i];
795 if (mode == IEEE80211_MODE_AUTO) {
796 /* ignore turbo channels for autoselect */
797 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
798 break;
799 } else {
800 if ((c->ic_flags & modeflags) == modeflags)
801 break;
802 }
803 }
804 if (i > IEEE80211_CHAN_MAX) {
805 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
806 "%s: no channels found for mode %u\n", __func__, mode);
807 return EINVAL;
808 }
809
810 /*
811 * Calculate the active channel set.
812 */
813 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
814 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
815 c = &ic->ic_channels[i];
816 if (mode == IEEE80211_MODE_AUTO) {
817 /* take anything but pure turbo channels */
818 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
819 setbit(ic->ic_chan_active, i);
820 } else {
821 if ((c->ic_flags & modeflags) == modeflags)
822 setbit(ic->ic_chan_active, i);
823 }
824 }
825 /*
826 * If no current/default channel is setup or the current
827 * channel is wrong for the mode then pick the first
828 * available channel from the active list. This is likely
829 * not the right one.
830 */
831 if (ic->ic_ibss_chan == NULL ||
832 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
833 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
834 if (isset(ic->ic_chan_active, i)) {
835 ic->ic_ibss_chan = &ic->ic_channels[i];
836 break;
837 }
838 KASSERT(ic->ic_ibss_chan != NULL &&
839 isset(ic->ic_chan_active,
840 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)),
841 ("Bad IBSS channel %u",
842 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)));
843 }
844 /*
845 * If the desired channel is set but no longer valid then reset it.
846 */
847 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
848 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan)))
849 ic->ic_des_chan = IEEE80211_CHAN_ANYC;
850
851 /*
852 * Do mode-specific rate setup.
853 */
854 if (mode == IEEE80211_MODE_11G) {
855 /*
856 * Use a mixed 11b/11g rate set.
857 */
858 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
859 IEEE80211_MODE_11G);
860 } else if (mode == IEEE80211_MODE_11B) {
861 /*
862 * Force pure 11b rate set.
863 */
864 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
865 IEEE80211_MODE_11B);
866 }
867 /*
868 * Setup an initial rate set according to the
869 * current/default channel selected above. This
870 * will be changed when scanning but must exist
871 * now so driver have a consistent state of ic_ibss_chan.
872 */
873 if (ic->ic_bss) /* NB: can be called before lateattach */
874 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode];
875
876 ic->ic_curmode = mode;
877 ieee80211_reset_erp(ic); /* reset ERP state */
878 ieee80211_wme_initparams(ic); /* reset WME stat */
879
880 return 0;
881#undef N
882}
883
884/*
885 * Return the phy mode for with the specified channel so the
886 * caller can select a rate set. This is problematic for channels
887 * where multiple operating modes are possible (e.g. 11g+11b).
888 * In those cases we defer to the current operating mode when set.
889 */
890enum ieee80211_phymode
891ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
892{
893 if (IEEE80211_IS_CHAN_5GHZ(chan)) {
894 /*
895 * This assumes all 11a turbo channels are also
896 * usable withut turbo, which is currently true.
897 */
898 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A)
899 return IEEE80211_MODE_TURBO_A;
900 return IEEE80211_MODE_11A;
901 } else if (IEEE80211_IS_CHAN_FHSS(chan))
902 return IEEE80211_MODE_FH;
903 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) {
904 /*
905 * This assumes all 11g channels are also usable
906 * for 11b, which is currently true.
907 */
908 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G)
909 return IEEE80211_MODE_TURBO_G;
910 if (ic->ic_curmode == IEEE80211_MODE_11B)
911 return IEEE80211_MODE_11B;
912 return IEEE80211_MODE_11G;
913 } else
914 return IEEE80211_MODE_11B;
915}
916
917/*
918 * convert IEEE80211 rate value to ifmedia subtype.
919 * ieee80211 rate is in unit of 0.5Mbps.
920 */
921int
922ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
923{
924#define N(a) (sizeof(a) / sizeof(a[0]))
925 static const struct {
926 u_int m; /* rate + mode */
927 u_int r; /* if_media rate */
928 } rates[] = {
929 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
930 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
931 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
932 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
933 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
934 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
935 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
936 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
937 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
938 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
939 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
940 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
941 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
942 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
943 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
944 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
945 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
946 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
947 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
948 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
949 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
950 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
951 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
952 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
953 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
954 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
955 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
956 /* NB: OFDM72 doesn't realy exist so we don't handle it */
957 };
958 u_int mask, i;
959
960 mask = rate & IEEE80211_RATE_VAL;
961 switch (mode) {
962 case IEEE80211_MODE_11A:
963 case IEEE80211_MODE_TURBO_A:
964 mask |= IFM_IEEE80211_11A;
965 break;
966 case IEEE80211_MODE_11B:
967 mask |= IFM_IEEE80211_11B;
968 break;
969 case IEEE80211_MODE_FH:
970 mask |= IFM_IEEE80211_FH;
971 break;
972 case IEEE80211_MODE_AUTO:
973 /* NB: ic may be NULL for some drivers */
974 if (ic && ic->ic_phytype == IEEE80211_T_FH) {
975 mask |= IFM_IEEE80211_FH;
976 break;
977 }
978 /* NB: hack, 11g matches both 11b+11a rates */
979 /* fall thru... */
980 case IEEE80211_MODE_11G:
981 case IEEE80211_MODE_TURBO_G:
982 mask |= IFM_IEEE80211_11G;
983 break;
984 }
985 for (i = 0; i < N(rates); i++)
986 if (rates[i].m == mask)
987 return rates[i].r;
988 return IFM_AUTO;
989#undef N
990}
991
992int
993ieee80211_media2rate(int mword)
994{
995#define N(a) (sizeof(a) / sizeof(a[0]))
996 static const int ieeerates[] = {
997 -1, /* IFM_AUTO */
998 0, /* IFM_MANUAL */
999 0, /* IFM_NONE */
1000 2, /* IFM_IEEE80211_FH1 */
1001 4, /* IFM_IEEE80211_FH2 */
1002 2, /* IFM_IEEE80211_DS1 */
1003 4, /* IFM_IEEE80211_DS2 */
1004 11, /* IFM_IEEE80211_DS5 */
1005 22, /* IFM_IEEE80211_DS11 */
1006 44, /* IFM_IEEE80211_DS22 */
1007 12, /* IFM_IEEE80211_OFDM6 */
1008 18, /* IFM_IEEE80211_OFDM9 */
1009 24, /* IFM_IEEE80211_OFDM12 */
1010 36, /* IFM_IEEE80211_OFDM18 */
1011 48, /* IFM_IEEE80211_OFDM24 */
1012 72, /* IFM_IEEE80211_OFDM36 */
1013 96, /* IFM_IEEE80211_OFDM48 */
1014 108, /* IFM_IEEE80211_OFDM54 */
1015 144, /* IFM_IEEE80211_OFDM72 */
1016 };
1017 return IFM_SUBTYPE(mword) < N(ieeerates) ?
1018 ieeerates[IFM_SUBTYPE(mword)] : 0;
1019#undef N
1020}
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2005 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 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/net80211/ieee80211.c 148936 2005-08-10 16:22:30Z sam $");
35
36/*
37 * IEEE 802.11 generic handler
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43
44#include <sys/socket.h>
45
46#include <net/if.h>
47#include <net/if_media.h>
48#include <net/ethernet.h>
49
50#include <net80211/ieee80211_var.h>
51
52#include <net/bpf.h>
53
54const char *ieee80211_phymode_name[] = {
55 "auto", /* IEEE80211_MODE_AUTO */
56 "11a", /* IEEE80211_MODE_11A */
57 "11b", /* IEEE80211_MODE_11B */
58 "11g", /* IEEE80211_MODE_11G */
59 "FH", /* IEEE80211_MODE_FH */
60 "turboA", /* IEEE80211_MODE_TURBO_A */
61 "turboG", /* IEEE80211_MODE_TURBO_G */
62};
63
64/* list of all instances */
65SLIST_HEAD(ieee80211_list, ieee80211com);
66static struct ieee80211_list ieee80211_list =
67 SLIST_HEAD_INITIALIZER(ieee80211_list);
68static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */
69static struct mtx ieee80211_vap_mtx;
70MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF);
71
72static void
73ieee80211_add_vap(struct ieee80211com *ic)
74{
75#define N(a) (sizeof(a)/sizeof(a[0]))
76 int i;
77 u_int8_t b;
78
79 mtx_lock(&ieee80211_vap_mtx);
80 ic->ic_vap = 0;
81 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++)
82 ic->ic_vap += NBBY;
83 if (i == N(ieee80211_vapmap))
84 panic("vap table full");
85 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1)
86 ic->ic_vap++;
87 setbit(ieee80211_vapmap, ic->ic_vap);
88 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next);
89 mtx_unlock(&ieee80211_vap_mtx);
90#undef N
91}
92
93static void
94ieee80211_remove_vap(struct ieee80211com *ic)
95{
96 mtx_lock(&ieee80211_vap_mtx);
97 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next);
98 KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY,
99 ("invalid vap id %d", ic->ic_vap));
100 KASSERT(isset(ieee80211_vapmap, ic->ic_vap),
101 ("vap id %d not allocated", ic->ic_vap));
102 clrbit(ieee80211_vapmap, ic->ic_vap);
103 mtx_unlock(&ieee80211_vap_mtx);
104}
105
106/*
107 * Default reset method for use with the ioctl support. This
108 * method is invoked after any state change in the 802.11
109 * layer that should be propagated to the hardware but not
110 * require re-initialization of the 802.11 state machine (e.g
111 * rescanning for an ap). We always return ENETRESET which
112 * should cause the driver to re-initialize the device. Drivers
113 * can override this method to implement more optimized support.
114 */
115static int
116ieee80211_default_reset(struct ifnet *ifp)
117{
118 return ENETRESET;
119}
120
121void
122ieee80211_ifattach(struct ieee80211com *ic)
123{
124 struct ifnet *ifp = ic->ic_ifp;
125 struct ieee80211_channel *c;
126 int i;
127
128 ether_ifattach(ifp, ic->ic_myaddr);
129 bpfattach2(ifp, DLT_IEEE802_11,
130 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
131
132 ieee80211_crypto_attach(ic);
133
134 /*
135 * Fill in 802.11 available channel set, mark
136 * all available channels as active, and pick
137 * a default channel if not already specified.
138 */
139 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
140 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
141 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
142 c = &ic->ic_channels[i];
143 if (c->ic_flags) {
144 /*
145 * Verify driver passed us valid data.
146 */
147 if (i != ieee80211_chan2ieee(ic, c)) {
148 if_printf(ifp, "bad channel ignored; "
149 "freq %u flags %x number %u\n",
150 c->ic_freq, c->ic_flags, i);
151 c->ic_flags = 0; /* NB: remove */
152 continue;
153 }
154 setbit(ic->ic_chan_avail, i);
155 /*
156 * Identify mode capabilities.
157 */
158 if (IEEE80211_IS_CHAN_A(c))
159 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
160 if (IEEE80211_IS_CHAN_B(c))
161 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
162 if (IEEE80211_IS_CHAN_PUREG(c))
163 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
164 if (IEEE80211_IS_CHAN_FHSS(c))
165 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
166 if (IEEE80211_IS_CHAN_T(c))
167 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A;
168 if (IEEE80211_IS_CHAN_108G(c))
169 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G;
170 if (ic->ic_curchan == NULL) {
171 /* arbitrarily pick the first channel */
172 ic->ic_curchan = &ic->ic_channels[i];
173 }
174 }
175 }
176 /* validate ic->ic_curmode */
177 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
178 ic->ic_curmode = IEEE80211_MODE_AUTO;
179 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
180#if 0
181 /*
182 * Enable WME by default if we're capable.
183 */
184 if (ic->ic_caps & IEEE80211_C_WME)
185 ic->ic_flags |= IEEE80211_F_WME;
186#endif
187 (void) ieee80211_setmode(ic, ic->ic_curmode);
188
189 if (ic->ic_bintval == 0)
190 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
191 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */
192 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT;
193 IEEE80211_BEACON_LOCK_INIT(ic, "beacon");
194
195 if (ic->ic_lintval == 0)
196 ic->ic_lintval = ic->ic_bintval;
197 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
198
199 ieee80211_node_attach(ic);
200 ieee80211_proto_attach(ic);
201
202 ieee80211_add_vap(ic);
203
204 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */
205
206 /*
207 * Install a default reset method for the ioctl support.
208 * The driver is expected to fill this in before calling us.
209 */
210 if (ic->ic_reset == NULL)
211 ic->ic_reset = ieee80211_default_reset;
212}
213
214void
215ieee80211_ifdetach(struct ieee80211com *ic)
216{
217 struct ifnet *ifp = ic->ic_ifp;
218
219 ieee80211_remove_vap(ic);
220
221 ieee80211_sysctl_detach(ic);
222 ieee80211_proto_detach(ic);
223 ieee80211_crypto_detach(ic);
224 ieee80211_node_detach(ic);
225 ifmedia_removeall(&ic->ic_media);
226
227 IEEE80211_BEACON_LOCK_DESTROY(ic);
228
229 bpfdetach(ifp);
230 ether_ifdetach(ifp);
231}
232
233/*
234 * Convert MHz frequency to IEEE channel number.
235 */
236u_int
237ieee80211_mhz2ieee(u_int freq, u_int flags)
238{
239 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
240 if (freq == 2484)
241 return 14;
242 if (freq < 2484)
243 return (freq - 2407) / 5;
244 else
245 return 15 + ((freq - 2512) / 20);
246 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
247 return (freq - 5000) / 5;
248 } else { /* either, guess */
249 if (freq == 2484)
250 return 14;
251 if (freq < 2484)
252 return (freq - 2407) / 5;
253 if (freq < 5000)
254 return 15 + ((freq - 2512) / 20);
255 return (freq - 5000) / 5;
256 }
257}
258
259/*
260 * Convert channel to IEEE channel number.
261 */
262u_int
263ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
264{
265 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
266 return c - ic->ic_channels;
267 else if (c == IEEE80211_CHAN_ANYC)
268 return IEEE80211_CHAN_ANY;
269 else if (c != NULL) {
270 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n",
271 c->ic_freq, c->ic_flags);
272 return 0; /* XXX */
273 } else {
274 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
275 return 0; /* XXX */
276 }
277}
278
279/*
280 * Convert IEEE channel number to MHz frequency.
281 */
282u_int
283ieee80211_ieee2mhz(u_int chan, u_int flags)
284{
285 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
286 if (chan == 14)
287 return 2484;
288 if (chan < 14)
289 return 2407 + chan*5;
290 else
291 return 2512 + ((chan-15)*20);
292 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
293 return 5000 + (chan*5);
294 } else { /* either, guess */
295 if (chan == 14)
296 return 2484;
297 if (chan < 14) /* 0-13 */
298 return 2407 + chan*5;
299 if (chan < 27) /* 15-26 */
300 return 2512 + ((chan-15)*20);
301 return 5000 + (chan*5);
302 }
303}
304
305/*
306 * Setup the media data structures according to the channel and
307 * rate tables. This must be called by the driver after
308 * ieee80211_attach and before most anything else.
309 */
310void
311ieee80211_media_init(struct ieee80211com *ic,
312 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
313{
314#define ADD(_ic, _s, _o) \
315 ifmedia_add(&(_ic)->ic_media, \
316 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
317 struct ifnet *ifp = ic->ic_ifp;
318 struct ifmediareq imr;
319 int i, j, mode, rate, maxrate, mword, mopt, r;
320 struct ieee80211_rateset *rs;
321 struct ieee80211_rateset allrates;
322
323 /*
324 * Do late attach work that must wait for any subclass
325 * (i.e. driver) work such as overriding methods.
326 */
327 ieee80211_node_lateattach(ic);
328
329 /*
330 * Fill in media characteristics.
331 */
332 ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
333 maxrate = 0;
334 memset(&allrates, 0, sizeof(allrates));
335 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
336 static const u_int mopts[] = {
337 IFM_AUTO,
338 IFM_IEEE80211_11A,
339 IFM_IEEE80211_11B,
340 IFM_IEEE80211_11G,
341 IFM_IEEE80211_FH,
342 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
343 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO,
344 };
345 if ((ic->ic_modecaps & (1<<mode)) == 0)
346 continue;
347 mopt = mopts[mode];
348 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
349 if (ic->ic_caps & IEEE80211_C_IBSS)
350 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
351 if (ic->ic_caps & IEEE80211_C_HOSTAP)
352 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
353 if (ic->ic_caps & IEEE80211_C_AHDEMO)
354 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
355 if (ic->ic_caps & IEEE80211_C_MONITOR)
356 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
357 if (mode == IEEE80211_MODE_AUTO)
358 continue;
359 rs = &ic->ic_sup_rates[mode];
360 for (i = 0; i < rs->rs_nrates; i++) {
361 rate = rs->rs_rates[i];
362 mword = ieee80211_rate2media(ic, rate, mode);
363 if (mword == 0)
364 continue;
365 ADD(ic, mword, mopt);
366 if (ic->ic_caps & IEEE80211_C_IBSS)
367 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
368 if (ic->ic_caps & IEEE80211_C_HOSTAP)
369 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
370 if (ic->ic_caps & IEEE80211_C_AHDEMO)
371 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
372 if (ic->ic_caps & IEEE80211_C_MONITOR)
373 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
374 /*
375 * Add rate to the collection of all rates.
376 */
377 r = rate & IEEE80211_RATE_VAL;
378 for (j = 0; j < allrates.rs_nrates; j++)
379 if (allrates.rs_rates[j] == r)
380 break;
381 if (j == allrates.rs_nrates) {
382 /* unique, add to the set */
383 allrates.rs_rates[j] = r;
384 allrates.rs_nrates++;
385 }
386 rate = (rate & IEEE80211_RATE_VAL) / 2;
387 if (rate > maxrate)
388 maxrate = rate;
389 }
390 }
391 for (i = 0; i < allrates.rs_nrates; i++) {
392 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
393 IEEE80211_MODE_AUTO);
394 if (mword == 0)
395 continue;
396 mword = IFM_SUBTYPE(mword); /* remove media options */
397 ADD(ic, mword, 0);
398 if (ic->ic_caps & IEEE80211_C_IBSS)
399 ADD(ic, mword, IFM_IEEE80211_ADHOC);
400 if (ic->ic_caps & IEEE80211_C_HOSTAP)
401 ADD(ic, mword, IFM_IEEE80211_HOSTAP);
402 if (ic->ic_caps & IEEE80211_C_AHDEMO)
403 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
404 if (ic->ic_caps & IEEE80211_C_MONITOR)
405 ADD(ic, mword, IFM_IEEE80211_MONITOR);
406 }
407 ieee80211_media_status(ifp, &imr);
408 ifmedia_set(&ic->ic_media, imr.ifm_active);
409
410 if (maxrate)
411 ifp->if_baudrate = IF_Mbps(maxrate);
412#undef ADD
413}
414
415void
416ieee80211_announce(struct ieee80211com *ic)
417{
418 struct ifnet *ifp = ic->ic_ifp;
419 int i, mode, rate, mword;
420 struct ieee80211_rateset *rs;
421
422 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) {
423 if ((ic->ic_modecaps & (1<<mode)) == 0)
424 continue;
425 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
426 rs = &ic->ic_sup_rates[mode];
427 for (i = 0; i < rs->rs_nrates; i++) {
428 rate = rs->rs_rates[i];
429 mword = ieee80211_rate2media(ic, rate, mode);
430 if (mword == 0)
431 continue;
432 printf("%s%d%sMbps", (i != 0 ? " " : ""),
433 (rate & IEEE80211_RATE_VAL) / 2,
434 ((rate & 0x1) != 0 ? ".5" : ""));
435 }
436 printf("\n");
437 }
438}
439
440static int
441findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
442{
443#define IEEERATE(_ic,_m,_i) \
444 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
445 int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
446 for (i = 0; i < nrates; i++)
447 if (IEEERATE(ic, mode, i) == rate)
448 return i;
449 return -1;
450#undef IEEERATE
451}
452
453/*
454 * Find an instance by it's mac address.
455 */
456struct ieee80211com *
457ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN])
458{
459 struct ieee80211com *ic;
460
461 /* XXX lock */
462 SLIST_FOREACH(ic, &ieee80211_list, ic_next)
463 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr))
464 return ic;
465 return NULL;
466}
467
468static struct ieee80211com *
469ieee80211_find_instance(struct ifnet *ifp)
470{
471 struct ieee80211com *ic;
472
473 /* XXX lock */
474 /* XXX not right for multiple instances but works for now */
475 SLIST_FOREACH(ic, &ieee80211_list, ic_next)
476 if (ic->ic_ifp == ifp)
477 return ic;
478 return NULL;
479}
480
481/*
482 * Handle a media change request.
483 */
484int
485ieee80211_media_change(struct ifnet *ifp)
486{
487 struct ieee80211com *ic;
488 struct ifmedia_entry *ime;
489 enum ieee80211_opmode newopmode;
490 enum ieee80211_phymode newphymode;
491 int i, j, newrate, error = 0;
492
493 ic = ieee80211_find_instance(ifp);
494 if (!ic) {
495 if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
496 return EINVAL;
497 }
498 ime = ic->ic_media.ifm_cur;
499 /*
500 * First, identify the phy mode.
501 */
502 switch (IFM_MODE(ime->ifm_media)) {
503 case IFM_IEEE80211_11A:
504 newphymode = IEEE80211_MODE_11A;
505 break;
506 case IFM_IEEE80211_11B:
507 newphymode = IEEE80211_MODE_11B;
508 break;
509 case IFM_IEEE80211_11G:
510 newphymode = IEEE80211_MODE_11G;
511 break;
512 case IFM_IEEE80211_FH:
513 newphymode = IEEE80211_MODE_FH;
514 break;
515 case IFM_AUTO:
516 newphymode = IEEE80211_MODE_AUTO;
517 break;
518 default:
519 return EINVAL;
520 }
521 /*
522 * Turbo mode is an ``option''.
523 * XXX does not apply to AUTO
524 */
525 if (ime->ifm_media & IFM_IEEE80211_TURBO) {
526 if (newphymode == IEEE80211_MODE_11A)
527 newphymode = IEEE80211_MODE_TURBO_A;
528 else if (newphymode == IEEE80211_MODE_11G)
529 newphymode = IEEE80211_MODE_TURBO_G;
530 else
531 return EINVAL;
532 }
533 /*
534 * Validate requested mode is available.
535 */
536 if ((ic->ic_modecaps & (1<<newphymode)) == 0)
537 return EINVAL;
538
539 /*
540 * Next, the fixed/variable rate.
541 */
542 i = -1;
543 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
544 /*
545 * Convert media subtype to rate.
546 */
547 newrate = ieee80211_media2rate(ime->ifm_media);
548 if (newrate == 0)
549 return EINVAL;
550 /*
551 * Check the rate table for the specified/current phy.
552 */
553 if (newphymode == IEEE80211_MODE_AUTO) {
554 /*
555 * In autoselect mode search for the rate.
556 */
557 for (j = IEEE80211_MODE_11A;
558 j < IEEE80211_MODE_MAX; j++) {
559 if ((ic->ic_modecaps & (1<<j)) == 0)
560 continue;
561 i = findrate(ic, j, newrate);
562 if (i != -1) {
563 /* lock mode too */
564 newphymode = j;
565 break;
566 }
567 }
568 } else {
569 i = findrate(ic, newphymode, newrate);
570 }
571 if (i == -1) /* mode/rate mismatch */
572 return EINVAL;
573 }
574 /* NB: defer rate setting to later */
575
576 /*
577 * Deduce new operating mode but don't install it just yet.
578 */
579 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
580 (IFM_IEEE80211_ADHOC|IFM_FLAG0))
581 newopmode = IEEE80211_M_AHDEMO;
582 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
583 newopmode = IEEE80211_M_HOSTAP;
584 else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
585 newopmode = IEEE80211_M_IBSS;
586 else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
587 newopmode = IEEE80211_M_MONITOR;
588 else
589 newopmode = IEEE80211_M_STA;
590
591 /*
592 * Autoselect doesn't make sense when operating as an AP.
593 * If no phy mode has been selected, pick one and lock it
594 * down so rate tables can be used in forming beacon frames
595 * and the like.
596 */
597 if (newopmode == IEEE80211_M_HOSTAP &&
598 newphymode == IEEE80211_MODE_AUTO) {
599 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
600 if (ic->ic_modecaps & (1<<j)) {
601 newphymode = j;
602 break;
603 }
604 }
605
606 /*
607 * Handle phy mode change.
608 */
609 if (ic->ic_curmode != newphymode) { /* change phy mode */
610 error = ieee80211_setmode(ic, newphymode);
611 if (error != 0)
612 return error;
613 error = ENETRESET;
614 }
615
616 /*
617 * Committed to changes, install the rate setting.
618 */
619 if (ic->ic_fixed_rate != i) {
620 ic->ic_fixed_rate = i; /* set fixed tx rate */
621 error = ENETRESET;
622 }
623
624 /*
625 * Handle operating mode change.
626 */
627 if (ic->ic_opmode != newopmode) {
628 ic->ic_opmode = newopmode;
629 switch (newopmode) {
630 case IEEE80211_M_AHDEMO:
631 case IEEE80211_M_HOSTAP:
632 case IEEE80211_M_STA:
633 case IEEE80211_M_MONITOR:
634 ic->ic_flags &= ~IEEE80211_F_IBSSON;
635 break;
636 case IEEE80211_M_IBSS:
637 ic->ic_flags |= IEEE80211_F_IBSSON;
638 break;
639 }
640 /*
641 * Yech, slot time may change depending on the
642 * operating mode so reset it to be sure everything
643 * is setup appropriately.
644 */
645 ieee80211_reset_erp(ic);
646 ieee80211_wme_initparams(ic); /* after opmode change */
647 error = ENETRESET;
648 }
649#ifdef notdef
650 if (error == 0)
651 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
652#endif
653 return error;
654}
655
656void
657ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
658{
659 struct ieee80211com *ic;
660 struct ieee80211_rateset *rs;
661
662 ic = ieee80211_find_instance(ifp);
663 if (!ic) {
664 if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
665 return;
666 }
667 imr->ifm_status = IFM_AVALID;
668 imr->ifm_active = IFM_IEEE80211;
669 if (ic->ic_state == IEEE80211_S_RUN)
670 imr->ifm_status |= IFM_ACTIVE;
671 /*
672 * Calculate a current rate if possible.
673 */
674 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
675 /*
676 * A fixed rate is set, report that.
677 */
678 rs = &ic->ic_sup_rates[ic->ic_curmode];
679 imr->ifm_active |= ieee80211_rate2media(ic,
680 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode);
681 } else if (ic->ic_opmode == IEEE80211_M_STA) {
682 /*
683 * In station mode report the current transmit rate.
684 */
685 rs = &ic->ic_bss->ni_rates;
686 imr->ifm_active |= ieee80211_rate2media(ic,
687 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode);
688 } else
689 imr->ifm_active |= IFM_AUTO;
690 switch (ic->ic_opmode) {
691 case IEEE80211_M_STA:
692 break;
693 case IEEE80211_M_IBSS:
694 imr->ifm_active |= IFM_IEEE80211_ADHOC;
695 break;
696 case IEEE80211_M_AHDEMO:
697 /* should not come here */
698 break;
699 case IEEE80211_M_HOSTAP:
700 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
701 break;
702 case IEEE80211_M_MONITOR:
703 imr->ifm_active |= IFM_IEEE80211_MONITOR;
704 break;
705 }
706 switch (ic->ic_curmode) {
707 case IEEE80211_MODE_11A:
708 imr->ifm_active |= IFM_IEEE80211_11A;
709 break;
710 case IEEE80211_MODE_11B:
711 imr->ifm_active |= IFM_IEEE80211_11B;
712 break;
713 case IEEE80211_MODE_11G:
714 imr->ifm_active |= IFM_IEEE80211_11G;
715 break;
716 case IEEE80211_MODE_FH:
717 imr->ifm_active |= IFM_IEEE80211_FH;
718 break;
719 case IEEE80211_MODE_TURBO_A:
720 imr->ifm_active |= IFM_IEEE80211_11A
721 | IFM_IEEE80211_TURBO;
722 break;
723 case IEEE80211_MODE_TURBO_G:
724 imr->ifm_active |= IFM_IEEE80211_11G
725 | IFM_IEEE80211_TURBO;
726 break;
727 }
728}
729
730void
731ieee80211_watchdog(struct ieee80211com *ic)
732{
733 struct ieee80211_node_table *nt;
734 int need_inact_timer = 0;
735
736 if (ic->ic_state != IEEE80211_S_INIT) {
737 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
738 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0);
739 nt = &ic->ic_scan;
740 if (nt->nt_inact_timer) {
741 if (--nt->nt_inact_timer == 0)
742 nt->nt_timeout(nt);
743 need_inact_timer += nt->nt_inact_timer;
744 }
745 nt = &ic->ic_sta;
746 if (nt->nt_inact_timer) {
747 if (--nt->nt_inact_timer == 0)
748 nt->nt_timeout(nt);
749 need_inact_timer += nt->nt_inact_timer;
750 }
751 }
752 if (ic->ic_mgt_timer != 0 || need_inact_timer)
753 ic->ic_ifp->if_timer = 1;
754}
755
756/*
757 * Set the current phy mode and recalculate the active channel
758 * set based on the available channels for this mode. Also
759 * select a new default/current channel if the current one is
760 * inappropriate for this mode.
761 */
762int
763ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
764{
765#define N(a) (sizeof(a) / sizeof(a[0]))
766 static const u_int chanflags[] = {
767 0, /* IEEE80211_MODE_AUTO */
768 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
769 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
770 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
771 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */
772 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */
773 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */
774 };
775 struct ieee80211_channel *c;
776 u_int modeflags;
777 int i;
778
779 /* validate new mode */
780 if ((ic->ic_modecaps & (1<<mode)) == 0) {
781 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
782 "%s: mode %u not supported (caps 0x%x)\n",
783 __func__, mode, ic->ic_modecaps);
784 return EINVAL;
785 }
786
787 /*
788 * Verify at least one channel is present in the available
789 * channel list before committing to the new mode.
790 */
791 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode));
792 modeflags = chanflags[mode];
793 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
794 c = &ic->ic_channels[i];
795 if (mode == IEEE80211_MODE_AUTO) {
796 /* ignore turbo channels for autoselect */
797 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
798 break;
799 } else {
800 if ((c->ic_flags & modeflags) == modeflags)
801 break;
802 }
803 }
804 if (i > IEEE80211_CHAN_MAX) {
805 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
806 "%s: no channels found for mode %u\n", __func__, mode);
807 return EINVAL;
808 }
809
810 /*
811 * Calculate the active channel set.
812 */
813 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
814 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
815 c = &ic->ic_channels[i];
816 if (mode == IEEE80211_MODE_AUTO) {
817 /* take anything but pure turbo channels */
818 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
819 setbit(ic->ic_chan_active, i);
820 } else {
821 if ((c->ic_flags & modeflags) == modeflags)
822 setbit(ic->ic_chan_active, i);
823 }
824 }
825 /*
826 * If no current/default channel is setup or the current
827 * channel is wrong for the mode then pick the first
828 * available channel from the active list. This is likely
829 * not the right one.
830 */
831 if (ic->ic_ibss_chan == NULL ||
832 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
833 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
834 if (isset(ic->ic_chan_active, i)) {
835 ic->ic_ibss_chan = &ic->ic_channels[i];
836 break;
837 }
838 KASSERT(ic->ic_ibss_chan != NULL &&
839 isset(ic->ic_chan_active,
840 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)),
841 ("Bad IBSS channel %u",
842 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)));
843 }
844 /*
845 * If the desired channel is set but no longer valid then reset it.
846 */
847 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
848 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan)))
849 ic->ic_des_chan = IEEE80211_CHAN_ANYC;
850
851 /*
852 * Do mode-specific rate setup.
853 */
854 if (mode == IEEE80211_MODE_11G) {
855 /*
856 * Use a mixed 11b/11g rate set.
857 */
858 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
859 IEEE80211_MODE_11G);
860 } else if (mode == IEEE80211_MODE_11B) {
861 /*
862 * Force pure 11b rate set.
863 */
864 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
865 IEEE80211_MODE_11B);
866 }
867 /*
868 * Setup an initial rate set according to the
869 * current/default channel selected above. This
870 * will be changed when scanning but must exist
871 * now so driver have a consistent state of ic_ibss_chan.
872 */
873 if (ic->ic_bss) /* NB: can be called before lateattach */
874 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode];
875
876 ic->ic_curmode = mode;
877 ieee80211_reset_erp(ic); /* reset ERP state */
878 ieee80211_wme_initparams(ic); /* reset WME stat */
879
880 return 0;
881#undef N
882}
883
884/*
885 * Return the phy mode for with the specified channel so the
886 * caller can select a rate set. This is problematic for channels
887 * where multiple operating modes are possible (e.g. 11g+11b).
888 * In those cases we defer to the current operating mode when set.
889 */
890enum ieee80211_phymode
891ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
892{
893 if (IEEE80211_IS_CHAN_5GHZ(chan)) {
894 /*
895 * This assumes all 11a turbo channels are also
896 * usable withut turbo, which is currently true.
897 */
898 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A)
899 return IEEE80211_MODE_TURBO_A;
900 return IEEE80211_MODE_11A;
901 } else if (IEEE80211_IS_CHAN_FHSS(chan))
902 return IEEE80211_MODE_FH;
903 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) {
904 /*
905 * This assumes all 11g channels are also usable
906 * for 11b, which is currently true.
907 */
908 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G)
909 return IEEE80211_MODE_TURBO_G;
910 if (ic->ic_curmode == IEEE80211_MODE_11B)
911 return IEEE80211_MODE_11B;
912 return IEEE80211_MODE_11G;
913 } else
914 return IEEE80211_MODE_11B;
915}
916
917/*
918 * convert IEEE80211 rate value to ifmedia subtype.
919 * ieee80211 rate is in unit of 0.5Mbps.
920 */
921int
922ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
923{
924#define N(a) (sizeof(a) / sizeof(a[0]))
925 static const struct {
926 u_int m; /* rate + mode */
927 u_int r; /* if_media rate */
928 } rates[] = {
929 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
930 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
931 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
932 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
933 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
934 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
935 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
936 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
937 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
938 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
939 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
940 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
941 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
942 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
943 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
944 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
945 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
946 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
947 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
948 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
949 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
950 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
951 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
952 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
953 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
954 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
955 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
956 /* NB: OFDM72 doesn't realy exist so we don't handle it */
957 };
958 u_int mask, i;
959
960 mask = rate & IEEE80211_RATE_VAL;
961 switch (mode) {
962 case IEEE80211_MODE_11A:
963 case IEEE80211_MODE_TURBO_A:
964 mask |= IFM_IEEE80211_11A;
965 break;
966 case IEEE80211_MODE_11B:
967 mask |= IFM_IEEE80211_11B;
968 break;
969 case IEEE80211_MODE_FH:
970 mask |= IFM_IEEE80211_FH;
971 break;
972 case IEEE80211_MODE_AUTO:
973 /* NB: ic may be NULL for some drivers */
974 if (ic && ic->ic_phytype == IEEE80211_T_FH) {
975 mask |= IFM_IEEE80211_FH;
976 break;
977 }
978 /* NB: hack, 11g matches both 11b+11a rates */
979 /* fall thru... */
980 case IEEE80211_MODE_11G:
981 case IEEE80211_MODE_TURBO_G:
982 mask |= IFM_IEEE80211_11G;
983 break;
984 }
985 for (i = 0; i < N(rates); i++)
986 if (rates[i].m == mask)
987 return rates[i].r;
988 return IFM_AUTO;
989#undef N
990}
991
992int
993ieee80211_media2rate(int mword)
994{
995#define N(a) (sizeof(a) / sizeof(a[0]))
996 static const int ieeerates[] = {
997 -1, /* IFM_AUTO */
998 0, /* IFM_MANUAL */
999 0, /* IFM_NONE */
1000 2, /* IFM_IEEE80211_FH1 */
1001 4, /* IFM_IEEE80211_FH2 */
1002 2, /* IFM_IEEE80211_DS1 */
1003 4, /* IFM_IEEE80211_DS2 */
1004 11, /* IFM_IEEE80211_DS5 */
1005 22, /* IFM_IEEE80211_DS11 */
1006 44, /* IFM_IEEE80211_DS22 */
1007 12, /* IFM_IEEE80211_OFDM6 */
1008 18, /* IFM_IEEE80211_OFDM9 */
1009 24, /* IFM_IEEE80211_OFDM12 */
1010 36, /* IFM_IEEE80211_OFDM18 */
1011 48, /* IFM_IEEE80211_OFDM24 */
1012 72, /* IFM_IEEE80211_OFDM36 */
1013 96, /* IFM_IEEE80211_OFDM48 */
1014 108, /* IFM_IEEE80211_OFDM54 */
1015 144, /* IFM_IEEE80211_OFDM72 */
1016 };
1017 return IFM_SUBTYPE(mword) < N(ieeerates) ?
1018 ieeerates[IFM_SUBTYPE(mword)] : 0;
1019#undef N
1020}