1 /*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002, 2003 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: releng/5.2/sys/net80211/ieee80211.c 120067 2003-09-14 22:32:18Z sam $");
35
36 /*
37 * IEEE 802.11 generic handler
38 */
39
40 #include "opt_inet.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mbuf.h>
45 #include <sys/malloc.h>
46 #include <sys/kernel.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
49 #include <sys/endian.h>
50 #include <sys/errno.h>
51 #include <sys/bus.h>
52 #include <sys/proc.h>
53 #include <sys/sysctl.h>
54
55 #include <machine/atomic.h>
56
57 #include <net/if.h>
58 #include <net/if_dl.h>
59 #include <net/if_media.h>
60 #include <net/if_arp.h>
61 #include <net/ethernet.h>
62 #include <net/if_llc.h>
63
64 #include <net80211/ieee80211_var.h>
65
66 #include <net/bpf.h>
67
68 #ifdef INET
69 #include <netinet/in.h>
70 #include <netinet/if_ether.h>
71 #endif
72
73 #ifdef IEEE80211_DEBUG
74 int ieee80211_debug = 0;
75 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug,
76 0, "IEEE 802.11 media debugging printfs");
77 #endif
78
79 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *,
80 enum ieee80211_phymode);
81
82 static const char *ieee80211_phymode_name[] = {
83 "auto", /* IEEE80211_MODE_AUTO */
84 "11a", /* IEEE80211_MODE_11A */
85 "11b", /* IEEE80211_MODE_11B */
86 "11g", /* IEEE80211_MODE_11G */
87 "turbo", /* IEEE80211_MODE_TURBO */
88 };
89
90 void
91 ieee80211_ifattach(struct ifnet *ifp)
92 {
93 struct ieee80211com *ic = (void *)ifp;
94 struct ieee80211_channel *c;
95 int i;
96
97 ether_ifattach(ifp, ic->ic_myaddr);
98 bpfattach2(ifp, DLT_IEEE802_11,
99 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
100 ieee80211_crypto_attach(ifp);
101
102 /*
103 * Fill in 802.11 available channel set, mark
104 * all available channels as active, and pick
105 * a default channel if not already specified.
106 */
107 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
108 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
109 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
110 c = &ic->ic_channels[i];
111 if (c->ic_flags) {
112 /*
113 * Verify driver passed us valid data.
114 */
115 if (i != ieee80211_chan2ieee(ic, c)) {
116 if_printf(ifp, "bad channel ignored; "
117 "freq %u flags %x number %u\n",
118 c->ic_freq, c->ic_flags, i);
119 c->ic_flags = 0; /* NB: remove */
120 continue;
121 }
122 setbit(ic->ic_chan_avail, i);
123 /*
124 * Identify mode capabilities.
125 */
126 if (IEEE80211_IS_CHAN_A(c))
127 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
128 if (IEEE80211_IS_CHAN_B(c))
129 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
130 if (IEEE80211_IS_CHAN_PUREG(c))
131 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
132 if (IEEE80211_IS_CHAN_T(c))
133 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO;
134 }
135 }
136 /* validate ic->ic_curmode */
137 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
138 ic->ic_curmode = IEEE80211_MODE_AUTO;
139
140 (void) ieee80211_setmode(ic, ic->ic_curmode);
141
142 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
143 if (ic->ic_lintval == 0)
144 ic->ic_lintval = 100; /* default sleep */
145 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */
146
147 ieee80211_node_attach(ifp);
148 ieee80211_proto_attach(ifp);
149 }
150
151 void
152 ieee80211_ifdetach(struct ifnet *ifp)
153 {
154 struct ieee80211com *ic = (void *)ifp;
155
156 ieee80211_proto_detach(ifp);
157 ieee80211_crypto_detach(ifp);
158 ieee80211_node_detach(ifp);
159 ifmedia_removeall(&ic->ic_media);
160 bpfdetach(ifp);
161 ether_ifdetach(ifp);
162 }
163
164 /*
165 * Convert MHz frequency to IEEE channel number.
166 */
167 u_int
168 ieee80211_mhz2ieee(u_int freq, u_int flags)
169 {
170 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
171 if (freq == 2484)
172 return 14;
173 if (freq < 2484)
174 return (freq - 2407) / 5;
175 else
176 return 15 + ((freq - 2512) / 20);
177 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
178 return (freq - 5000) / 5;
179 } else { /* either, guess */
180 if (freq == 2484)
181 return 14;
182 if (freq < 2484)
183 return (freq - 2407) / 5;
184 if (freq < 5000)
185 return 15 + ((freq - 2512) / 20);
186 return (freq - 5000) / 5;
187 }
188 }
189
190 /*
191 * Convert channel to IEEE channel number.
192 */
193 u_int
194 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
195 {
196 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
197 return c - ic->ic_channels;
198 else if (c == IEEE80211_CHAN_ANYC)
199 return IEEE80211_CHAN_ANY;
200 else if (c != NULL) {
201 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n",
202 c->ic_freq, c->ic_flags);
203 return 0; /* XXX */
204 } else {
205 if_printf(&ic->ic_if, "invalid channel (NULL)\n");
206 return 0; /* XXX */
207 }
208 }
209
210 /*
211 * Convert IEEE channel number to MHz frequency.
212 */
213 u_int
214 ieee80211_ieee2mhz(u_int chan, u_int flags)
215 {
216 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
217 if (chan == 14)
218 return 2484;
219 if (chan < 14)
220 return 2407 + chan*5;
221 else
222 return 2512 + ((chan-15)*20);
223 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
224 return 5000 + (chan*5);
225 } else { /* either, guess */
226 if (chan == 14)
227 return 2484;
228 if (chan < 14) /* 0-13 */
229 return 2407 + chan*5;
230 if (chan < 27) /* 15-26 */
231 return 2512 + ((chan-15)*20);
232 return 5000 + (chan*5);
233 }
234 }
235
236 /*
237 * Setup the media data structures according to the channel and
238 * rate tables. This must be called by the driver after
239 * ieee80211_attach and before most anything else.
240 */
241 void
242 ieee80211_media_init(struct ifnet *ifp,
243 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
244 {
245 #define ADD(_ic, _s, _o) \
246 ifmedia_add(&(_ic)->ic_media, \
247 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
248 struct ieee80211com *ic = (void *)ifp;
249 struct ifmediareq imr;
250 int i, j, mode, rate, maxrate, mword, mopt, r;
251 struct ieee80211_rateset *rs;
252 struct ieee80211_rateset allrates;
253
254 /*
255 * Do late attach work that must wait for any subclass
256 * (i.e. driver) work such as overriding methods.
257 */
258 ieee80211_node_lateattach(ifp);
259
260 /*
261 * Fill in media characteristics.
262 */
263 ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
264 maxrate = 0;
265 memset(&allrates, 0, sizeof(allrates));
266 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
267 static const u_int mopts[] = {
268 IFM_AUTO,
269 IFM_MAKEMODE(IFM_IEEE80211_11A),
270 IFM_MAKEMODE(IFM_IEEE80211_11B),
271 IFM_MAKEMODE(IFM_IEEE80211_11G),
272 IFM_MAKEMODE(IFM_IEEE80211_11A) | IFM_IEEE80211_TURBO,
273 };
274 if ((ic->ic_modecaps & (1<<mode)) == 0)
275 continue;
276 mopt = mopts[mode];
277 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
278 if (ic->ic_caps & IEEE80211_C_IBSS)
279 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
280 if (ic->ic_caps & IEEE80211_C_HOSTAP)
281 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
282 if (ic->ic_caps & IEEE80211_C_AHDEMO)
283 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
284 if (ic->ic_caps & IEEE80211_C_MONITOR)
285 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
286 if (mode == IEEE80211_MODE_AUTO)
287 continue;
288 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
289 rs = &ic->ic_sup_rates[mode];
290 for (i = 0; i < rs->rs_nrates; i++) {
291 rate = rs->rs_rates[i];
292 mword = ieee80211_rate2media(ic, rate, mode);
293 if (mword == 0)
294 continue;
295 printf("%s%d%sMbps", (i != 0 ? " " : ""),
296 (rate & IEEE80211_RATE_VAL) / 2,
297 ((rate & 0x1) != 0 ? ".5" : ""));
298 ADD(ic, mword, mopt);
299 if (ic->ic_caps & IEEE80211_C_IBSS)
300 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
301 if (ic->ic_caps & IEEE80211_C_HOSTAP)
302 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
303 if (ic->ic_caps & IEEE80211_C_AHDEMO)
304 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
305 if (ic->ic_caps & IEEE80211_C_MONITOR)
306 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
307 /*
308 * Add rate to the collection of all rates.
309 */
310 r = rate & IEEE80211_RATE_VAL;
311 for (j = 0; j < allrates.rs_nrates; j++)
312 if (allrates.rs_rates[j] == r)
313 break;
314 if (j == allrates.rs_nrates) {
315 /* unique, add to the set */
316 allrates.rs_rates[j] = r;
317 allrates.rs_nrates++;
318 }
319 rate = (rate & IEEE80211_RATE_VAL) / 2;
320 if (rate > maxrate)
321 maxrate = rate;
322 }
323 printf("\n");
324 }
325 for (i = 0; i < allrates.rs_nrates; i++) {
326 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
327 IEEE80211_MODE_AUTO);
328 if (mword == 0)
329 continue;
330 mword = IFM_SUBTYPE(mword); /* remove media options */
331 ADD(ic, mword, 0);
332 if (ic->ic_caps & IEEE80211_C_IBSS)
333 ADD(ic, mword, IFM_IEEE80211_ADHOC);
334 if (ic->ic_caps & IEEE80211_C_HOSTAP)
335 ADD(ic, mword, IFM_IEEE80211_HOSTAP);
336 if (ic->ic_caps & IEEE80211_C_AHDEMO)
337 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
338 if (ic->ic_caps & IEEE80211_C_MONITOR)
339 ADD(ic, mword, IFM_IEEE80211_MONITOR);
340 }
341 ieee80211_media_status(ifp, &imr);
342 ifmedia_set(&ic->ic_media, imr.ifm_active);
343
344 if (maxrate)
345 ifp->if_baudrate = IF_Mbps(maxrate);
346 #undef ADD
347 }
348
349 static int
350 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
351 {
352 #define IEEERATE(_ic,_m,_i) \
353 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
354 int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
355 for (i = 0; i < nrates; i++)
356 if (IEEERATE(ic, mode, i) == rate)
357 return i;
358 return -1;
359 #undef IEEERATE
360 }
361
362 /*
363 * Handle a media change request.
364 */
365 int
366 ieee80211_media_change(struct ifnet *ifp)
367 {
368 struct ieee80211com *ic = (void *)ifp;
369 struct ifmedia_entry *ime;
370 enum ieee80211_opmode newopmode;
371 enum ieee80211_phymode newphymode;
372 int i, j, newrate, error = 0;
373
374 ime = ic->ic_media.ifm_cur;
375 /*
376 * First, identify the phy mode.
377 */
378 switch (IFM_MODE(ime->ifm_media)) {
379 case IFM_IEEE80211_11A:
380 newphymode = IEEE80211_MODE_11A;
381 break;
382 case IFM_IEEE80211_11B:
383 newphymode = IEEE80211_MODE_11B;
384 break;
385 case IFM_IEEE80211_11G:
386 newphymode = IEEE80211_MODE_11G;
387 break;
388 case IFM_AUTO:
389 newphymode = IEEE80211_MODE_AUTO;
390 break;
391 default:
392 return EINVAL;
393 }
394 /*
395 * Turbo mode is an ``option''. Eventually it
396 * needs to be applied to 11g too.
397 */
398 if (ime->ifm_media & IFM_IEEE80211_TURBO) {
399 if (newphymode != IEEE80211_MODE_11A)
400 return EINVAL;
401 newphymode = IEEE80211_MODE_TURBO;
402 }
403 /*
404 * Validate requested mode is available.
405 */
406 if ((ic->ic_modecaps & (1<<newphymode)) == 0)
407 return EINVAL;
408
409 /*
410 * Next, the fixed/variable rate.
411 */
412 i = -1;
413 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
414 /*
415 * Convert media subtype to rate.
416 */
417 newrate = ieee80211_media2rate(ime->ifm_media);
418 if (newrate == 0)
419 return EINVAL;
420 /*
421 * Check the rate table for the specified/current phy.
422 */
423 if (newphymode == IEEE80211_MODE_AUTO) {
424 /*
425 * In autoselect mode search for the rate.
426 */
427 for (j = IEEE80211_MODE_11A;
428 j < IEEE80211_MODE_MAX; j++) {
429 if ((ic->ic_modecaps & (1<<j)) == 0)
430 continue;
431 i = findrate(ic, j, newrate);
432 if (i != -1) {
433 /* lock mode too */
434 newphymode = j;
435 break;
436 }
437 }
438 } else {
439 i = findrate(ic, newphymode, newrate);
440 }
441 if (i == -1) /* mode/rate mismatch */
442 return EINVAL;
443 }
444 /* NB: defer rate setting to later */
445
446 /*
447 * Deduce new operating mode but don't install it just yet.
448 */
449 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
450 (IFM_IEEE80211_ADHOC|IFM_FLAG0))
451 newopmode = IEEE80211_M_AHDEMO;
452 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
453 newopmode = IEEE80211_M_HOSTAP;
454 else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
455 newopmode = IEEE80211_M_IBSS;
456 else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
457 newopmode = IEEE80211_M_MONITOR;
458 else
459 newopmode = IEEE80211_M_STA;
460
461 /*
462 * Autoselect doesn't make sense when operating as an AP.
463 * If no phy mode has been selected, pick one and lock it
464 * down so rate tables can be used in forming beacon frames
465 * and the like.
466 */
467 if (newopmode == IEEE80211_M_HOSTAP &&
468 newphymode == IEEE80211_MODE_AUTO) {
469 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
470 if (ic->ic_modecaps & (1<<j)) {
471 newphymode = j;
472 break;
473 }
474 }
475
476 /*
477 * Handle phy mode change.
478 */
479 if (ic->ic_curmode != newphymode) { /* change phy mode */
480 error = ieee80211_setmode(ic, newphymode);
481 if (error != 0)
482 return error;
483 error = ENETRESET;
484 }
485
486 /*
487 * Committed to changes, install the rate setting.
488 */
489 if (ic->ic_fixed_rate != i) {
490 ic->ic_fixed_rate = i; /* set fixed tx rate */
491 error = ENETRESET;
492 }
493
494 /*
495 * Handle operating mode change.
496 */
497 if (ic->ic_opmode != newopmode) {
498 ic->ic_opmode = newopmode;
499 switch (newopmode) {
500 case IEEE80211_M_AHDEMO:
501 case IEEE80211_M_HOSTAP:
502 case IEEE80211_M_STA:
503 case IEEE80211_M_MONITOR:
504 ic->ic_flags &= ~IEEE80211_F_IBSSON;
505 break;
506 case IEEE80211_M_IBSS:
507 ic->ic_flags |= IEEE80211_F_IBSSON;
508 #ifdef notdef
509 if (ic->ic_curmode == IEEE80211_MODE_11G)
510 ieee80211_set11gbasicrates(
511 &ic->ic_suprates[newphymode],
512 IEEE80211_MODE_11B);
513 #endif
514 break;
515 }
516 error = ENETRESET;
517 }
518 #ifdef notdef
519 if (error == 0)
520 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
521 #endif
522 return error;
523 }
524
525 void
526 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
527 {
528 struct ieee80211com *ic = (void *)ifp;
529 struct ieee80211_node *ni = NULL;
530
531 imr->ifm_status = IFM_AVALID;
532 imr->ifm_active = IFM_IEEE80211;
533 if (ic->ic_state == IEEE80211_S_RUN)
534 imr->ifm_status |= IFM_ACTIVE;
535 imr->ifm_active |= IFM_AUTO;
536 switch (ic->ic_opmode) {
537 case IEEE80211_M_STA:
538 ni = ic->ic_bss;
539 /* calculate rate subtype */
540 imr->ifm_active |= ieee80211_rate2media(ic,
541 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode);
542 break;
543 case IEEE80211_M_IBSS:
544 imr->ifm_active |= IFM_IEEE80211_ADHOC;
545 break;
546 case IEEE80211_M_AHDEMO:
547 /* should not come here */
548 break;
549 case IEEE80211_M_HOSTAP:
550 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
551 break;
552 case IEEE80211_M_MONITOR:
553 imr->ifm_active |= IFM_IEEE80211_MONITOR;
554 break;
555 }
556 switch (ic->ic_curmode) {
557 case IEEE80211_MODE_11A:
558 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A);
559 break;
560 case IEEE80211_MODE_11B:
561 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11B);
562 break;
563 case IEEE80211_MODE_11G:
564 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11G);
565 break;
566 case IEEE80211_MODE_TURBO:
567 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A)
568 | IFM_IEEE80211_TURBO;
569 break;
570 }
571 }
572
573 void
574 ieee80211_watchdog(struct ifnet *ifp)
575 {
576 struct ieee80211com *ic = (void *)ifp;
577
578 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
579 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
580 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0)
581 ieee80211_timeout_nodes(ic);
582
583 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0)
584 ifp->if_timer = 1;
585 }
586
587 /*
588 * Mark the basic rates for the 11g rate table based on the
589 * operating mode. For real 11g we mark all the 11b rates
590 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only
591 * 11b rates. There's also a pseudo 11a-mode used to mark only
592 * the basic OFDM rates.
593 */
594 static void
595 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode)
596 {
597 static const struct ieee80211_rateset basic[] = {
598 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */
599 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */
600 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */
601 { 0 }, /* IEEE80211_MODE_TURBO */
602 };
603 int i, j;
604
605 for (i = 0; i < rs->rs_nrates; i++) {
606 rs->rs_rates[i] &= IEEE80211_RATE_VAL;
607 for (j = 0; j < basic[mode].rs_nrates; j++)
608 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
609 rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
610 break;
611 }
612 }
613 }
614
615 /*
616 * Set the current phy mode and recalculate the active channel
617 * set based on the available channels for this mode. Also
618 * select a new default/current channel if the current one is
619 * inappropriate for this mode.
620 */
621 int
622 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
623 {
624 #define N(a) (sizeof(a) / sizeof(a[0]))
625 static const u_int chanflags[] = {
626 0, /* IEEE80211_MODE_AUTO */
627 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
628 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
629 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
630 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */
631 };
632 struct ieee80211_channel *c;
633 u_int modeflags;
634 int i;
635
636 /* validate new mode */
637 if ((ic->ic_modecaps & (1<<mode)) == 0) {
638 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n",
639 __func__, mode, ic->ic_modecaps));
640 return EINVAL;
641 }
642
643 /*
644 * Verify at least one channel is present in the available
645 * channel list before committing to the new mode.
646 */
647 KASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode));
648 modeflags = chanflags[mode];
649 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
650 c = &ic->ic_channels[i];
651 if (mode == IEEE80211_MODE_AUTO) {
652 /* ignore turbo channels for autoselect */
653 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
654 break;
655 } else {
656 if ((c->ic_flags & modeflags) == modeflags)
657 break;
658 }
659 }
660 if (i > IEEE80211_CHAN_MAX) {
661 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n",
662 __func__, mode));
663 return EINVAL;
664 }
665
666 /*
667 * Calculate the active channel set.
668 */
669 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
670 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
671 c = &ic->ic_channels[i];
672 if (mode == IEEE80211_MODE_AUTO) {
673 /* take anything but pure turbo channels */
674 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
675 setbit(ic->ic_chan_active, i);
676 } else {
677 if ((c->ic_flags & modeflags) == modeflags)
678 setbit(ic->ic_chan_active, i);
679 }
680 }
681 /*
682 * If no current/default channel is setup or the current
683 * channel is wrong for the mode then pick the first
684 * available channel from the active list. This is likely
685 * not the right one.
686 */
687 if (ic->ic_ibss_chan == NULL ||
688 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
689 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
690 if (isset(ic->ic_chan_active, i)) {
691 ic->ic_ibss_chan = &ic->ic_channels[i];
692 break;
693 }
694 }
695
696 /*
697 * Set/reset state flags that influence beacon contents, etc.
698 *
699 * XXX what if we have stations already associated???
700 * XXX probably not right for autoselect?
701 */
702 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
703 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
704 if (mode == IEEE80211_MODE_11G) {
705 if (ic->ic_caps & IEEE80211_C_SHSLOT)
706 ic->ic_flags |= IEEE80211_F_SHSLOT;
707 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
708 IEEE80211_MODE_11G);
709 } else {
710 ic->ic_flags &= ~IEEE80211_F_SHSLOT;
711 }
712
713 ic->ic_curmode = mode;
714 return 0;
715 #undef N
716 }
717
718 /*
719 * Return the phy mode for with the specified channel so the
720 * caller can select a rate set. This is problematic and the
721 * work here assumes how things work elsewhere in this code.
722 */
723 enum ieee80211_phymode
724 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
725 {
726 /*
727 * NB: this assumes the channel would not be supplied to us
728 * unless it was already compatible with the current mode.
729 */
730 if (ic->ic_curmode != IEEE80211_MODE_AUTO)
731 return ic->ic_curmode;
732 /*
733 * In autoselect mode; deduce a mode based on the channel
734 * characteristics. We assume that turbo-only channels
735 * are not considered when the channel set is constructed.
736 */
737 if (IEEE80211_IS_CHAN_5GHZ(chan))
738 return IEEE80211_MODE_11A;
739 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN))
740 return IEEE80211_MODE_11G;
741 else
742 return IEEE80211_MODE_11B;
743 }
744
745 /*
746 * convert IEEE80211 rate value to ifmedia subtype.
747 * ieee80211 rate is in unit of 0.5Mbps.
748 */
749 int
750 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
751 {
752 #define N(a) (sizeof(a) / sizeof(a[0]))
753 static const struct {
754 u_int m; /* rate + mode */
755 u_int r; /* if_media rate */
756 } rates[] = {
757 { 2 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS1 },
758 { 4 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS2 },
759 { 11 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS5 },
760 { 22 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS11 },
761 { 44 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS22 },
762 { 12 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM6 },
763 { 18 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM9 },
764 { 24 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM12 },
765 { 36 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM18 },
766 { 48 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM24 },
767 { 72 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM36 },
768 { 96 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM48 },
769 { 108 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM54 },
770 { 2 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS1 },
771 { 4 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS2 },
772 { 11 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS5 },
773 { 22 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS11 },
774 { 12 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM6 },
775 { 18 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM9 },
776 { 24 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM12 },
777 { 36 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM18 },
778 { 48 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM24 },
779 { 72 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM36 },
780 { 96 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM48 },
781 { 108 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM54 },
782 /* NB: OFDM72 doesn't realy exist so we don't handle it */
783 };
784 u_int mask, i;
785
786 mask = rate & IEEE80211_RATE_VAL;
787 switch (mode) {
788 case IEEE80211_MODE_11A:
789 case IEEE80211_MODE_TURBO:
790 mask |= IFM_MAKEMODE(IFM_IEEE80211_11A);
791 break;
792 case IEEE80211_MODE_11B:
793 mask |= IFM_MAKEMODE(IFM_IEEE80211_11B);
794 break;
795 case IEEE80211_MODE_AUTO:
796 /* NB: ic may be NULL for some drivers */
797 if (ic && ic->ic_phytype == IEEE80211_T_FH) {
798 /* must handle these specially */
799 switch (mask) {
800 case 2: return IFM_IEEE80211_FH1;
801 case 4: return IFM_IEEE80211_FH2;
802 }
803 return IFM_AUTO;
804 }
805 /* NB: hack, 11g matches both 11b+11a rates */
806 /* fall thru... */
807 case IEEE80211_MODE_11G:
808 mask |= IFM_MAKEMODE(IFM_IEEE80211_11G);
809 break;
810 }
811 for (i = 0; i < N(rates); i++)
812 if (rates[i].m == mask)
813 return rates[i].r;
814 return IFM_AUTO;
815 #undef N
816 }
817
818 int
819 ieee80211_media2rate(int mword)
820 {
821 #define N(a) (sizeof(a) / sizeof(a[0]))
822 static const int ieeerates[] = {
823 -1, /* IFM_AUTO */
824 0, /* IFM_MANUAL */
825 0, /* IFM_NONE */
826 2, /* IFM_IEEE80211_FH1 */
827 4, /* IFM_IEEE80211_FH2 */
828 2, /* IFM_IEEE80211_DS1 */
829 4, /* IFM_IEEE80211_DS2 */
830 11, /* IFM_IEEE80211_DS5 */
831 22, /* IFM_IEEE80211_DS11 */
832 44, /* IFM_IEEE80211_DS22 */
833 12, /* IFM_IEEE80211_OFDM6 */
834 18, /* IFM_IEEE80211_OFDM9 */
835 24, /* IFM_IEEE80211_OFDM12 */
836 36, /* IFM_IEEE80211_OFDM18 */
837 48, /* IFM_IEEE80211_OFDM24 */
838 72, /* IFM_IEEE80211_OFDM36 */
839 96, /* IFM_IEEE80211_OFDM48 */
840 108, /* IFM_IEEE80211_OFDM54 */
841 144, /* IFM_IEEE80211_OFDM72 */
842 };
843 return IFM_SUBTYPE(mword) < N(ieeerates) ?
844 ieeerates[IFM_SUBTYPE(mword)] : 0;
845 #undef N
846 }
847
848 /*
849 * Module glue.
850 *
851 * NB: the module name is "wlan" for compatibility with NetBSD.
852 */
853
854 static int
855 ieee80211_modevent(module_t mod, int type, void *unused)
856 {
857 switch (type) {
858 case MOD_LOAD:
859 if (bootverbose)
860 printf("wlan: <802.11 Link Layer>\n");
861 return 0;
862 case MOD_UNLOAD:
863 return 0;
864 }
865 return EINVAL;
866 }
867
868 static moduledata_t ieee80211_mod = {
869 "wlan",
870 ieee80211_modevent,
871 0
872 };
873 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
874 MODULE_VERSION(wlan, 1);
875 MODULE_DEPEND(wlan, rc4, 1, 1, 1);
Cache object: 2cd82507a4dcea5bbfb4986752d62b39
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