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/5.3/sys/net80211/ieee80211.c 129876 2004-05-30 17:57:46Z phk $");
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/module.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/endian.h>
51 #include <sys/errno.h>
52 #include <sys/bus.h>
53 #include <sys/proc.h>
54 #include <sys/sysctl.h>
55
56 #include <machine/atomic.h>
57
58 #include <net/if.h>
59 #include <net/if_dl.h>
60 #include <net/if_media.h>
61 #include <net/if_arp.h>
62 #include <net/ethernet.h>
63 #include <net/if_llc.h>
64 #include <net/route.h>
65
66 #include <net80211/ieee80211_var.h>
67
68 #include <net/bpf.h>
69
70 #ifdef INET
71 #include <netinet/in.h>
72 #include <netinet/if_ether.h>
73 #endif
74
75 #ifdef IEEE80211_DEBUG
76 int ieee80211_debug = 0;
77 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug,
78 0, "IEEE 802.11 media debugging printfs");
79 #endif
80
81 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *,
82 enum ieee80211_phymode);
83
84 static const char *ieee80211_phymode_name[] = {
85 "auto", /* IEEE80211_MODE_AUTO */
86 "11a", /* IEEE80211_MODE_11A */
87 "11b", /* IEEE80211_MODE_11B */
88 "11g", /* IEEE80211_MODE_11G */
89 "FH", /* IEEE80211_MODE_FH */
90 "turbo", /* IEEE80211_MODE_TURBO */
91 };
92
93 void
94 ieee80211_ifattach(struct ifnet *ifp)
95 {
96 struct ieee80211com *ic = (void *)ifp;
97 struct ieee80211_channel *c;
98 int i;
99
100 ether_ifattach(ifp, ic->ic_myaddr);
101 bpfattach2(ifp, DLT_IEEE802_11,
102 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
103 ieee80211_crypto_attach(ifp);
104
105 /*
106 * Fill in 802.11 available channel set, mark
107 * all available channels as active, and pick
108 * a default channel if not already specified.
109 */
110 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
111 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
112 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
113 c = &ic->ic_channels[i];
114 if (c->ic_flags) {
115 /*
116 * Verify driver passed us valid data.
117 */
118 if (i != ieee80211_chan2ieee(ic, c)) {
119 if_printf(ifp, "bad channel ignored; "
120 "freq %u flags %x number %u\n",
121 c->ic_freq, c->ic_flags, i);
122 c->ic_flags = 0; /* NB: remove */
123 continue;
124 }
125 setbit(ic->ic_chan_avail, i);
126 /*
127 * Identify mode capabilities.
128 */
129 if (IEEE80211_IS_CHAN_A(c))
130 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
131 if (IEEE80211_IS_CHAN_B(c))
132 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
133 if (IEEE80211_IS_CHAN_PUREG(c))
134 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
135 if (IEEE80211_IS_CHAN_FHSS(c))
136 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
137 if (IEEE80211_IS_CHAN_T(c))
138 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO;
139 }
140 }
141 /* validate ic->ic_curmode */
142 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
143 ic->ic_curmode = IEEE80211_MODE_AUTO;
144 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
145
146 (void) ieee80211_setmode(ic, ic->ic_curmode);
147
148 if (ic->ic_lintval == 0)
149 ic->ic_lintval = 100; /* default sleep */
150 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */
151
152 ieee80211_node_attach(ifp);
153 ieee80211_proto_attach(ifp);
154 }
155
156 void
157 ieee80211_ifdetach(struct ifnet *ifp)
158 {
159 struct ieee80211com *ic = (void *)ifp;
160
161 ieee80211_proto_detach(ifp);
162 ieee80211_crypto_detach(ifp);
163 ieee80211_node_detach(ifp);
164 ifmedia_removeall(&ic->ic_media);
165 bpfdetach(ifp);
166 ether_ifdetach(ifp);
167 }
168
169 /*
170 * Convert MHz frequency to IEEE channel number.
171 */
172 u_int
173 ieee80211_mhz2ieee(u_int freq, u_int flags)
174 {
175 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
176 if (freq == 2484)
177 return 14;
178 if (freq < 2484)
179 return (freq - 2407) / 5;
180 else
181 return 15 + ((freq - 2512) / 20);
182 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
183 return (freq - 5000) / 5;
184 } else { /* either, guess */
185 if (freq == 2484)
186 return 14;
187 if (freq < 2484)
188 return (freq - 2407) / 5;
189 if (freq < 5000)
190 return 15 + ((freq - 2512) / 20);
191 return (freq - 5000) / 5;
192 }
193 }
194
195 /*
196 * Convert channel to IEEE channel number.
197 */
198 u_int
199 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
200 {
201 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
202 return c - ic->ic_channels;
203 else if (c == IEEE80211_CHAN_ANYC)
204 return IEEE80211_CHAN_ANY;
205 else if (c != NULL) {
206 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n",
207 c->ic_freq, c->ic_flags);
208 return 0; /* XXX */
209 } else {
210 if_printf(&ic->ic_if, "invalid channel (NULL)\n");
211 return 0; /* XXX */
212 }
213 }
214
215 /*
216 * Convert IEEE channel number to MHz frequency.
217 */
218 u_int
219 ieee80211_ieee2mhz(u_int chan, u_int flags)
220 {
221 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
222 if (chan == 14)
223 return 2484;
224 if (chan < 14)
225 return 2407 + chan*5;
226 else
227 return 2512 + ((chan-15)*20);
228 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
229 return 5000 + (chan*5);
230 } else { /* either, guess */
231 if (chan == 14)
232 return 2484;
233 if (chan < 14) /* 0-13 */
234 return 2407 + chan*5;
235 if (chan < 27) /* 15-26 */
236 return 2512 + ((chan-15)*20);
237 return 5000 + (chan*5);
238 }
239 }
240
241 /*
242 * Setup the media data structures according to the channel and
243 * rate tables. This must be called by the driver after
244 * ieee80211_attach and before most anything else.
245 */
246 void
247 ieee80211_media_init(struct ifnet *ifp,
248 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
249 {
250 #define ADD(_ic, _s, _o) \
251 ifmedia_add(&(_ic)->ic_media, \
252 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
253 struct ieee80211com *ic = (void *)ifp;
254 struct ifmediareq imr;
255 int i, j, mode, rate, maxrate, mword, mopt, r;
256 struct ieee80211_rateset *rs;
257 struct ieee80211_rateset allrates;
258
259 /*
260 * Do late attach work that must wait for any subclass
261 * (i.e. driver) work such as overriding methods.
262 */
263 ieee80211_node_lateattach(ifp);
264
265 /*
266 * Fill in media characteristics.
267 */
268 ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
269 maxrate = 0;
270 memset(&allrates, 0, sizeof(allrates));
271 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
272 static const u_int mopts[] = {
273 IFM_AUTO,
274 IFM_IEEE80211_11A,
275 IFM_IEEE80211_11B,
276 IFM_IEEE80211_11G,
277 IFM_IEEE80211_FH,
278 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
279 };
280 if ((ic->ic_modecaps & (1<<mode)) == 0)
281 continue;
282 mopt = mopts[mode];
283 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
284 if (ic->ic_caps & IEEE80211_C_IBSS)
285 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
286 if (ic->ic_caps & IEEE80211_C_HOSTAP)
287 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
288 if (ic->ic_caps & IEEE80211_C_AHDEMO)
289 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
290 if (ic->ic_caps & IEEE80211_C_MONITOR)
291 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
292 if (mode == IEEE80211_MODE_AUTO)
293 continue;
294 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
295 rs = &ic->ic_sup_rates[mode];
296 for (i = 0; i < rs->rs_nrates; i++) {
297 rate = rs->rs_rates[i];
298 mword = ieee80211_rate2media(ic, rate, mode);
299 if (mword == 0)
300 continue;
301 printf("%s%d%sMbps", (i != 0 ? " " : ""),
302 (rate & IEEE80211_RATE_VAL) / 2,
303 ((rate & 0x1) != 0 ? ".5" : ""));
304 ADD(ic, mword, mopt);
305 if (ic->ic_caps & IEEE80211_C_IBSS)
306 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
307 if (ic->ic_caps & IEEE80211_C_HOSTAP)
308 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
309 if (ic->ic_caps & IEEE80211_C_AHDEMO)
310 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
311 if (ic->ic_caps & IEEE80211_C_MONITOR)
312 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
313 /*
314 * Add rate to the collection of all rates.
315 */
316 r = rate & IEEE80211_RATE_VAL;
317 for (j = 0; j < allrates.rs_nrates; j++)
318 if (allrates.rs_rates[j] == r)
319 break;
320 if (j == allrates.rs_nrates) {
321 /* unique, add to the set */
322 allrates.rs_rates[j] = r;
323 allrates.rs_nrates++;
324 }
325 rate = (rate & IEEE80211_RATE_VAL) / 2;
326 if (rate > maxrate)
327 maxrate = rate;
328 }
329 printf("\n");
330 }
331 for (i = 0; i < allrates.rs_nrates; i++) {
332 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
333 IEEE80211_MODE_AUTO);
334 if (mword == 0)
335 continue;
336 mword = IFM_SUBTYPE(mword); /* remove media options */
337 ADD(ic, mword, 0);
338 if (ic->ic_caps & IEEE80211_C_IBSS)
339 ADD(ic, mword, IFM_IEEE80211_ADHOC);
340 if (ic->ic_caps & IEEE80211_C_HOSTAP)
341 ADD(ic, mword, IFM_IEEE80211_HOSTAP);
342 if (ic->ic_caps & IEEE80211_C_AHDEMO)
343 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
344 if (ic->ic_caps & IEEE80211_C_MONITOR)
345 ADD(ic, mword, IFM_IEEE80211_MONITOR);
346 }
347 ieee80211_media_status(ifp, &imr);
348 ifmedia_set(&ic->ic_media, imr.ifm_active);
349
350 if (maxrate)
351 ifp->if_baudrate = IF_Mbps(maxrate);
352 #undef ADD
353 }
354
355 static int
356 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
357 {
358 #define IEEERATE(_ic,_m,_i) \
359 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
360 int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
361 for (i = 0; i < nrates; i++)
362 if (IEEERATE(ic, mode, i) == rate)
363 return i;
364 return -1;
365 #undef IEEERATE
366 }
367
368 /*
369 * Handle a media change request.
370 */
371 int
372 ieee80211_media_change(struct ifnet *ifp)
373 {
374 struct ieee80211com *ic = (void *)ifp;
375 struct ifmedia_entry *ime;
376 enum ieee80211_opmode newopmode;
377 enum ieee80211_phymode newphymode;
378 int i, j, newrate, error = 0;
379
380 ime = ic->ic_media.ifm_cur;
381 /*
382 * First, identify the phy mode.
383 */
384 switch (IFM_MODE(ime->ifm_media)) {
385 case IFM_IEEE80211_11A:
386 newphymode = IEEE80211_MODE_11A;
387 break;
388 case IFM_IEEE80211_11B:
389 newphymode = IEEE80211_MODE_11B;
390 break;
391 case IFM_IEEE80211_11G:
392 newphymode = IEEE80211_MODE_11G;
393 break;
394 case IFM_IEEE80211_FH:
395 newphymode = IEEE80211_MODE_FH;
396 break;
397 case IFM_AUTO:
398 newphymode = IEEE80211_MODE_AUTO;
399 break;
400 default:
401 return EINVAL;
402 }
403 /*
404 * Turbo mode is an ``option''. Eventually it
405 * needs to be applied to 11g too.
406 */
407 if (ime->ifm_media & IFM_IEEE80211_TURBO) {
408 if (newphymode != IEEE80211_MODE_11A)
409 return EINVAL;
410 newphymode = IEEE80211_MODE_TURBO;
411 }
412 /*
413 * Validate requested mode is available.
414 */
415 if ((ic->ic_modecaps & (1<<newphymode)) == 0)
416 return EINVAL;
417
418 /*
419 * Next, the fixed/variable rate.
420 */
421 i = -1;
422 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
423 /*
424 * Convert media subtype to rate.
425 */
426 newrate = ieee80211_media2rate(ime->ifm_media);
427 if (newrate == 0)
428 return EINVAL;
429 /*
430 * Check the rate table for the specified/current phy.
431 */
432 if (newphymode == IEEE80211_MODE_AUTO) {
433 /*
434 * In autoselect mode search for the rate.
435 */
436 for (j = IEEE80211_MODE_11A;
437 j < IEEE80211_MODE_MAX; j++) {
438 if ((ic->ic_modecaps & (1<<j)) == 0)
439 continue;
440 i = findrate(ic, j, newrate);
441 if (i != -1) {
442 /* lock mode too */
443 newphymode = j;
444 break;
445 }
446 }
447 } else {
448 i = findrate(ic, newphymode, newrate);
449 }
450 if (i == -1) /* mode/rate mismatch */
451 return EINVAL;
452 }
453 /* NB: defer rate setting to later */
454
455 /*
456 * Deduce new operating mode but don't install it just yet.
457 */
458 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
459 (IFM_IEEE80211_ADHOC|IFM_FLAG0))
460 newopmode = IEEE80211_M_AHDEMO;
461 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
462 newopmode = IEEE80211_M_HOSTAP;
463 else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
464 newopmode = IEEE80211_M_IBSS;
465 else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
466 newopmode = IEEE80211_M_MONITOR;
467 else
468 newopmode = IEEE80211_M_STA;
469
470 /*
471 * Autoselect doesn't make sense when operating as an AP.
472 * If no phy mode has been selected, pick one and lock it
473 * down so rate tables can be used in forming beacon frames
474 * and the like.
475 */
476 if (newopmode == IEEE80211_M_HOSTAP &&
477 newphymode == IEEE80211_MODE_AUTO) {
478 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
479 if (ic->ic_modecaps & (1<<j)) {
480 newphymode = j;
481 break;
482 }
483 }
484
485 /*
486 * Handle phy mode change.
487 */
488 if (ic->ic_curmode != newphymode) { /* change phy mode */
489 error = ieee80211_setmode(ic, newphymode);
490 if (error != 0)
491 return error;
492 error = ENETRESET;
493 }
494
495 /*
496 * Committed to changes, install the rate setting.
497 */
498 if (ic->ic_fixed_rate != i) {
499 ic->ic_fixed_rate = i; /* set fixed tx rate */
500 error = ENETRESET;
501 }
502
503 /*
504 * Handle operating mode change.
505 */
506 if (ic->ic_opmode != newopmode) {
507 ic->ic_opmode = newopmode;
508 switch (newopmode) {
509 case IEEE80211_M_AHDEMO:
510 case IEEE80211_M_HOSTAP:
511 case IEEE80211_M_STA:
512 case IEEE80211_M_MONITOR:
513 ic->ic_flags &= ~IEEE80211_F_IBSSON;
514 break;
515 case IEEE80211_M_IBSS:
516 ic->ic_flags |= IEEE80211_F_IBSSON;
517 #ifdef notdef
518 if (ic->ic_curmode == IEEE80211_MODE_11G)
519 ieee80211_set11gbasicrates(
520 &ic->ic_suprates[newphymode],
521 IEEE80211_MODE_11B);
522 #endif
523 break;
524 }
525 error = ENETRESET;
526 }
527 #ifdef notdef
528 if (error == 0)
529 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
530 #endif
531 return error;
532 }
533
534 void
535 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
536 {
537 struct ieee80211com *ic = (void *)ifp;
538 struct ieee80211_node *ni = NULL;
539 int old_status = imr->ifm_status;
540
541 imr->ifm_status = IFM_AVALID;
542 imr->ifm_active = IFM_IEEE80211;
543 if (ic->ic_state == IEEE80211_S_RUN) {
544 imr->ifm_status |= IFM_ACTIVE;
545 ifp->if_link_state = LINK_STATE_UP;
546 } else
547 ifp->if_link_state = LINK_STATE_DOWN;
548 imr->ifm_active |= IFM_AUTO;
549 switch (ic->ic_opmode) {
550 case IEEE80211_M_STA:
551 ni = ic->ic_bss;
552 /* calculate rate subtype */
553 imr->ifm_active |= ieee80211_rate2media(ic,
554 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode);
555 break;
556 case IEEE80211_M_IBSS:
557 imr->ifm_active |= IFM_IEEE80211_ADHOC;
558 break;
559 case IEEE80211_M_AHDEMO:
560 /* should not come here */
561 break;
562 case IEEE80211_M_HOSTAP:
563 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
564 break;
565 case IEEE80211_M_MONITOR:
566 imr->ifm_active |= IFM_IEEE80211_MONITOR;
567 break;
568 }
569 switch (ic->ic_curmode) {
570 case IEEE80211_MODE_11A:
571 imr->ifm_active |= IFM_IEEE80211_11A;
572 break;
573 case IEEE80211_MODE_11B:
574 imr->ifm_active |= IFM_IEEE80211_11B;
575 break;
576 case IEEE80211_MODE_11G:
577 imr->ifm_active |= IFM_IEEE80211_11G;
578 break;
579 case IEEE80211_MODE_FH:
580 imr->ifm_active |= IFM_IEEE80211_FH;
581 break;
582 case IEEE80211_MODE_TURBO:
583 imr->ifm_active |= IFM_IEEE80211_11A
584 | IFM_IEEE80211_TURBO;
585 break;
586 }
587
588 /* Notify that the link state has changed. */
589 if (imr->ifm_status != old_status)
590 rt_ifmsg(ifp);
591 }
592
593 void
594 ieee80211_watchdog(struct ifnet *ifp)
595 {
596 struct ieee80211com *ic = (void *)ifp;
597
598 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
599 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
600 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0)
601 ieee80211_timeout_nodes(ic);
602
603 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0)
604 ifp->if_timer = 1;
605 }
606
607 /*
608 * Mark the basic rates for the 11g rate table based on the
609 * operating mode. For real 11g we mark all the 11b rates
610 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only
611 * 11b rates. There's also a pseudo 11a-mode used to mark only
612 * the basic OFDM rates.
613 */
614 static void
615 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode)
616 {
617 static const struct ieee80211_rateset basic[] = {
618 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */
619 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */
620 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */
621 { 0 }, /* IEEE80211_MODE_FH */
622 { 0 }, /* IEEE80211_MODE_TURBO */
623 };
624 int i, j;
625
626 for (i = 0; i < rs->rs_nrates; i++) {
627 rs->rs_rates[i] &= IEEE80211_RATE_VAL;
628 for (j = 0; j < basic[mode].rs_nrates; j++)
629 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
630 rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
631 break;
632 }
633 }
634 }
635
636 /*
637 * Set the current phy mode and recalculate the active channel
638 * set based on the available channels for this mode. Also
639 * select a new default/current channel if the current one is
640 * inappropriate for this mode.
641 */
642 int
643 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
644 {
645 #define N(a) (sizeof(a) / sizeof(a[0]))
646 static const u_int chanflags[] = {
647 0, /* IEEE80211_MODE_AUTO */
648 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
649 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
650 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
651 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */
652 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */
653 };
654 struct ieee80211_channel *c;
655 u_int modeflags;
656 int i;
657
658 /* validate new mode */
659 if ((ic->ic_modecaps & (1<<mode)) == 0) {
660 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n",
661 __func__, mode, ic->ic_modecaps));
662 return EINVAL;
663 }
664
665 /*
666 * Verify at least one channel is present in the available
667 * channel list before committing to the new mode.
668 */
669 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode));
670 modeflags = chanflags[mode];
671 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
672 c = &ic->ic_channels[i];
673 if (mode == IEEE80211_MODE_AUTO) {
674 /* ignore turbo channels for autoselect */
675 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
676 break;
677 } else {
678 if ((c->ic_flags & modeflags) == modeflags)
679 break;
680 }
681 }
682 if (i > IEEE80211_CHAN_MAX) {
683 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n",
684 __func__, mode));
685 return EINVAL;
686 }
687
688 /*
689 * Calculate the active channel set.
690 */
691 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
692 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
693 c = &ic->ic_channels[i];
694 if (mode == IEEE80211_MODE_AUTO) {
695 /* take anything but pure turbo channels */
696 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
697 setbit(ic->ic_chan_active, i);
698 } else {
699 if ((c->ic_flags & modeflags) == modeflags)
700 setbit(ic->ic_chan_active, i);
701 }
702 }
703 /*
704 * If no current/default channel is setup or the current
705 * channel is wrong for the mode then pick the first
706 * available channel from the active list. This is likely
707 * not the right one.
708 */
709 if (ic->ic_ibss_chan == NULL ||
710 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
711 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
712 if (isset(ic->ic_chan_active, i)) {
713 ic->ic_ibss_chan = &ic->ic_channels[i];
714 break;
715 }
716 }
717
718 /*
719 * Set/reset state flags that influence beacon contents, etc.
720 *
721 * XXX what if we have stations already associated???
722 * XXX probably not right for autoselect?
723 */
724 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
725 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
726 if (mode == IEEE80211_MODE_11G) {
727 if (ic->ic_caps & IEEE80211_C_SHSLOT)
728 ic->ic_flags |= IEEE80211_F_SHSLOT;
729 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
730 IEEE80211_MODE_11G);
731 } else {
732 ic->ic_flags &= ~IEEE80211_F_SHSLOT;
733 }
734
735 ic->ic_curmode = mode;
736 return 0;
737 #undef N
738 }
739
740 /*
741 * Return the phy mode for with the specified channel so the
742 * caller can select a rate set. This is problematic and the
743 * work here assumes how things work elsewhere in this code.
744 */
745 enum ieee80211_phymode
746 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
747 {
748 /*
749 * NB: this assumes the channel would not be supplied to us
750 * unless it was already compatible with the current mode.
751 */
752 if (ic->ic_curmode != IEEE80211_MODE_AUTO)
753 return ic->ic_curmode;
754 /*
755 * In autoselect mode; deduce a mode based on the channel
756 * characteristics. We assume that turbo-only channels
757 * are not considered when the channel set is constructed.
758 */
759 if (IEEE80211_IS_CHAN_5GHZ(chan))
760 return IEEE80211_MODE_11A;
761 else if (IEEE80211_IS_CHAN_FHSS(chan))
762 return IEEE80211_MODE_FH;
763 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN))
764 return IEEE80211_MODE_11G;
765 else
766 return IEEE80211_MODE_11B;
767 }
768
769 /*
770 * convert IEEE80211 rate value to ifmedia subtype.
771 * ieee80211 rate is in unit of 0.5Mbps.
772 */
773 int
774 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
775 {
776 #define N(a) (sizeof(a) / sizeof(a[0]))
777 static const struct {
778 u_int m; /* rate + mode */
779 u_int r; /* if_media rate */
780 } rates[] = {
781 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
782 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
783 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
784 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
785 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
786 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
787 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
788 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
789 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
790 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
791 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
792 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
793 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
794 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
795 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
796 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
797 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
798 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
799 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
800 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
801 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
802 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
803 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
804 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
805 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
806 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
807 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
808 /* NB: OFDM72 doesn't realy exist so we don't handle it */
809 };
810 u_int mask, i;
811
812 mask = rate & IEEE80211_RATE_VAL;
813 switch (mode) {
814 case IEEE80211_MODE_11A:
815 case IEEE80211_MODE_TURBO:
816 mask |= IFM_IEEE80211_11A;
817 break;
818 case IEEE80211_MODE_11B:
819 mask |= IFM_IEEE80211_11B;
820 break;
821 case IEEE80211_MODE_FH:
822 mask |= IFM_IEEE80211_FH;
823 break;
824 case IEEE80211_MODE_AUTO:
825 /* NB: ic may be NULL for some drivers */
826 if (ic && ic->ic_phytype == IEEE80211_T_FH) {
827 mask |= IFM_IEEE80211_FH;
828 break;
829 }
830 /* NB: hack, 11g matches both 11b+11a rates */
831 /* fall thru... */
832 case IEEE80211_MODE_11G:
833 mask |= IFM_IEEE80211_11G;
834 break;
835 }
836 for (i = 0; i < N(rates); i++)
837 if (rates[i].m == mask)
838 return rates[i].r;
839 return IFM_AUTO;
840 #undef N
841 }
842
843 int
844 ieee80211_media2rate(int mword)
845 {
846 #define N(a) (sizeof(a) / sizeof(a[0]))
847 static const int ieeerates[] = {
848 -1, /* IFM_AUTO */
849 0, /* IFM_MANUAL */
850 0, /* IFM_NONE */
851 2, /* IFM_IEEE80211_FH1 */
852 4, /* IFM_IEEE80211_FH2 */
853 2, /* IFM_IEEE80211_DS1 */
854 4, /* IFM_IEEE80211_DS2 */
855 11, /* IFM_IEEE80211_DS5 */
856 22, /* IFM_IEEE80211_DS11 */
857 44, /* IFM_IEEE80211_DS22 */
858 12, /* IFM_IEEE80211_OFDM6 */
859 18, /* IFM_IEEE80211_OFDM9 */
860 24, /* IFM_IEEE80211_OFDM12 */
861 36, /* IFM_IEEE80211_OFDM18 */
862 48, /* IFM_IEEE80211_OFDM24 */
863 72, /* IFM_IEEE80211_OFDM36 */
864 96, /* IFM_IEEE80211_OFDM48 */
865 108, /* IFM_IEEE80211_OFDM54 */
866 144, /* IFM_IEEE80211_OFDM72 */
867 };
868 return IFM_SUBTYPE(mword) < N(ieeerates) ?
869 ieeerates[IFM_SUBTYPE(mword)] : 0;
870 #undef N
871 }
872
873 /*
874 * Module glue.
875 *
876 * NB: the module name is "wlan" for compatibility with NetBSD.
877 */
878
879 static int
880 ieee80211_modevent(module_t mod, int type, void *unused)
881 {
882 switch (type) {
883 case MOD_LOAD:
884 if (bootverbose)
885 printf("wlan: <802.11 Link Layer>\n");
886 return 0;
887 case MOD_UNLOAD:
888 return 0;
889 }
890 return EINVAL;
891 }
892
893 static moduledata_t ieee80211_mod = {
894 "wlan",
895 ieee80211_modevent,
896 0
897 };
898 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
899 MODULE_VERSION(wlan, 1);
900 MODULE_DEPEND(wlan, rc4, 1, 1, 1);
901 MODULE_DEPEND(wlan, ether, 1, 1, 1);
Cache object: fea82b0040e7e33c2cba42839224637b
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