ieee80211.c revision 1.55 1 /* $NetBSD: ieee80211.c,v 1.55 2014/10/18 08:33:29 snj Exp $ */
2 /*-
3 * Copyright (c) 2001 Atsushi Onoe
4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 #ifdef __FreeBSD__
36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211.c,v 1.22 2005/08/10 16:22:29 sam Exp $");
37 #endif
38 #ifdef __NetBSD__
39 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.55 2014/10/18 08:33:29 snj Exp $");
40 #endif
41
42 /*
43 * IEEE 802.11 generic handler
44 */
45
46 #include "opt_inet.h"
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/endian.h>
55 #include <sys/errno.h>
56 #include <sys/proc.h>
57 #include <sys/sysctl.h>
58
59 #include <net/if.h>
60 #include <net/if_media.h>
61 #include <net/if_arp.h>
62 #include <net/if_ether.h>
63 #include <net/if_llc.h>
64
65 #include <net80211/ieee80211_netbsd.h>
66 #include <net80211/ieee80211_var.h>
67 #include <net80211/ieee80211_sysctl.h>
68
69 #include <net/bpf.h>
70
71 #ifdef INET
72 #include <netinet/in.h>
73 #include <net/if_ether.h>
74 #endif
75
76 const struct ieee80211_channel ieee80211_channel_anyc = {
77 0, 0
78 };
79
80 struct ieee80211com_head ieee80211com_head =
81 LIST_HEAD_INITIALIZER(ieee80211com_head);
82
83 const char *ieee80211_phymode_name[] = {
84 "auto", /* IEEE80211_MODE_AUTO */
85 "11a", /* IEEE80211_MODE_11A */
86 "11b", /* IEEE80211_MODE_11B */
87 "11g", /* IEEE80211_MODE_11G */
88 "FH", /* IEEE80211_MODE_FH */
89 "turboA", /* IEEE80211_MODE_TURBO_A */
90 "turboG", /* IEEE80211_MODE_TURBO_G */
91 };
92
93 /* list of all instances */
94 SLIST_HEAD(ieee80211_list, ieee80211com);
95 static struct ieee80211_list ieee80211_list =
96 SLIST_HEAD_INITIALIZER(ieee80211_list);
97 static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */
98
99 static void
100 ieee80211_add_vap(struct ieee80211com *ic)
101 {
102 #define N(a) (sizeof(a)/sizeof(a[0]))
103 int i;
104 int s;
105 u_int8_t b;
106
107 s = splnet();
108 ic->ic_vap = 0;
109 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++)
110 ic->ic_vap += NBBY;
111 if (i == N(ieee80211_vapmap))
112 panic("vap table full");
113 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1)
114 ic->ic_vap++;
115 setbit(ieee80211_vapmap, ic->ic_vap);
116 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next);
117 splx(s);
118 #undef N
119 }
120
121 static void
122 ieee80211_remove_vap(struct ieee80211com *ic)
123 {
124 int s;
125
126 s = splnet();
127 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next);
128 IASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY,
129 ("invalid vap id %d", ic->ic_vap));
130 IASSERT(isset(ieee80211_vapmap, ic->ic_vap),
131 ("vap id %d not allocated", ic->ic_vap));
132 clrbit(ieee80211_vapmap, ic->ic_vap);
133 splx(s);
134 }
135
136 /*
137 * Default reset method for use with the ioctl support. This
138 * method is invoked after any state change in the 802.11
139 * layer that should be propagated to the hardware but not
140 * require re-initialization of the 802.11 state machine (e.g
141 * rescanning for an ap). We always return ENETRESET which
142 * should cause the driver to re-initialize the device. Drivers
143 * can override this method to implement more optimized support.
144 */
145 static int
146 ieee80211_default_reset(struct ifnet *ifp)
147 {
148 return ENETRESET;
149 }
150
151 void
152 ieee80211_ifattach(struct ieee80211com *ic)
153 {
154 struct ifnet *ifp = ic->ic_ifp;
155 struct ieee80211_channel *c;
156 int i;
157
158 #ifdef __NetBSD__
159 ieee80211_init();
160 #endif /* __NetBSD__ */
161
162 ether_ifattach(ifp, ic->ic_myaddr);
163 bpf_attach2(ifp, DLT_IEEE802_11,
164 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
165
166 ieee80211_crypto_attach(ic);
167
168 /*
169 * Fill in 802.11 available channel set, mark
170 * all available channels as active, and pick
171 * a default channel if not already specified.
172 */
173 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
174 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
175 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
176 c = &ic->ic_channels[i];
177 if (c->ic_flags) {
178 /*
179 * Verify driver passed us valid data.
180 */
181 if (i != ieee80211_chan2ieee(ic, c)) {
182 if_printf(ifp, "bad channel ignored; "
183 "freq %u flags %x number %u\n",
184 c->ic_freq, c->ic_flags, i);
185 c->ic_flags = 0; /* NB: remove */
186 continue;
187 }
188 setbit(ic->ic_chan_avail, i);
189 /*
190 * Identify mode capabilities.
191 */
192 if (IEEE80211_IS_CHAN_A(c))
193 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
194 if (IEEE80211_IS_CHAN_B(c))
195 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
196 if (IEEE80211_IS_CHAN_PUREG(c))
197 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
198 if (IEEE80211_IS_CHAN_FHSS(c))
199 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH;
200 if (IEEE80211_IS_CHAN_T(c))
201 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A;
202 if (IEEE80211_IS_CHAN_108G(c))
203 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G;
204 if (ic->ic_curchan == NULL) {
205 /* arbitrarily pick the first channel */
206 ic->ic_curchan = &ic->ic_channels[i];
207 }
208 }
209 }
210 /* validate ic->ic_curmode */
211 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
212 ic->ic_curmode = IEEE80211_MODE_AUTO;
213 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
214 #if 0
215 /*
216 * Enable WME by default if we're capable.
217 */
218 if (ic->ic_caps & IEEE80211_C_WME)
219 ic->ic_flags |= IEEE80211_F_WME;
220 #endif
221 (void) ieee80211_setmode(ic, ic->ic_curmode);
222
223 if (ic->ic_bintval == 0)
224 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
225 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */
226 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT;
227 IEEE80211_BEACON_LOCK_INIT(ic, "beacon");
228
229 if (ic->ic_lintval == 0)
230 ic->ic_lintval = ic->ic_bintval;
231 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
232
233 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list);
234 ieee80211_node_attach(ic);
235 ieee80211_proto_attach(ic);
236
237 ieee80211_add_vap(ic);
238
239 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */
240
241 /*
242 * Install a default reset method for the ioctl support.
243 * The driver is expected to fill this in before calling us.
244 */
245 if (ic->ic_reset == NULL)
246 ic->ic_reset = ieee80211_default_reset;
247 }
248
249 void
250 ieee80211_ifdetach(struct ieee80211com *ic)
251 {
252 struct ifnet *ifp = ic->ic_ifp;
253
254 ieee80211_remove_vap(ic);
255
256 ieee80211_sysctl_detach(ic);
257 ieee80211_proto_detach(ic);
258 ieee80211_crypto_detach(ic);
259 ieee80211_node_detach(ic);
260 LIST_REMOVE(ic, ic_list);
261 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY);
262
263 IEEE80211_BEACON_LOCK_DESTROY(ic);
264
265 bpf_detach(ifp);
266 ether_ifdetach(ifp);
267 }
268
269 /*
270 * Convert MHz frequency to IEEE channel number.
271 */
272 u_int
273 ieee80211_mhz2ieee(u_int freq, u_int flags)
274 {
275 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
276 if (freq == 2484)
277 return 14;
278 if (freq < 2484)
279 return (freq - 2407) / 5;
280 else
281 return 15 + ((freq - 2512) / 20);
282 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5 GHz band */
283 return (freq - 5000) / 5;
284 } else { /* either, guess */
285 if (freq == 2484)
286 return 14;
287 if (freq < 2484)
288 return (freq - 2407) / 5;
289 if (freq < 5000)
290 return 15 + ((freq - 2512) / 20);
291 return (freq - 5000) / 5;
292 }
293 }
294
295 /*
296 * Convert channel to IEEE channel number.
297 */
298 u_int
299 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
300 {
301 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
302 return c - ic->ic_channels;
303 else if (c == IEEE80211_CHAN_ANYC)
304 return IEEE80211_CHAN_ANY;
305 else if (c != NULL) {
306 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n",
307 c->ic_freq, c->ic_flags);
308 return 0; /* XXX */
309 } else {
310 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
311 return 0; /* XXX */
312 }
313 }
314
315 /*
316 * Convert IEEE channel number to MHz frequency.
317 */
318 u_int
319 ieee80211_ieee2mhz(u_int chan, u_int flags)
320 {
321 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
322 if (chan == 14)
323 return 2484;
324 if (chan < 14)
325 return 2407 + chan*5;
326 else
327 return 2512 + ((chan-15)*20);
328 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5 GHz band */
329 return 5000 + (chan*5);
330 } else { /* either, guess */
331 if (chan == 14)
332 return 2484;
333 if (chan < 14) /* 0-13 */
334 return 2407 + chan*5;
335 if (chan < 27) /* 15-26 */
336 return 2512 + ((chan-15)*20);
337 return 5000 + (chan*5);
338 }
339 }
340
341 /*
342 * Setup the media data structures according to the channel and
343 * rate tables. This must be called by the driver after
344 * ieee80211_attach and before most anything else.
345 */
346 void
347 ieee80211_media_init(struct ieee80211com *ic,
348 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
349 {
350 #define ADD(_ic, _s, _o) \
351 ifmedia_add(&(_ic)->ic_media, \
352 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
353 struct ifnet *ifp = ic->ic_ifp;
354 struct ifmediareq imr;
355 int i, j, mode, rate, maxrate, mword, mopt, r;
356 const struct ieee80211_rateset *rs;
357 struct ieee80211_rateset allrates;
358
359 /*
360 * Do late attach work that must wait for any subclass
361 * (i.e. driver) work such as overriding methods.
362 */
363 ieee80211_node_lateattach(ic);
364
365 #ifdef IEEE80211_NO_HOSTAP
366 ic->ic_caps &= ~IEEE80211_C_HOSTAP;
367 #endif /* IEEE80211_NO_HOSTAP */
368
369 /*
370 * Fill in media characteristics.
371 */
372 ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
373 maxrate = 0;
374 memset(&allrates, 0, sizeof(allrates));
375 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
376 static const u_int mopts[] = {
377 IFM_AUTO,
378 IFM_IEEE80211_11A,
379 IFM_IEEE80211_11B,
380 IFM_IEEE80211_11G,
381 IFM_IEEE80211_FH,
382 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO,
383 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO,
384 };
385 if ((ic->ic_modecaps & (1<<mode)) == 0)
386 continue;
387 mopt = mopts[mode];
388 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
389 if (ic->ic_caps & IEEE80211_C_IBSS)
390 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
391 if (ic->ic_caps & IEEE80211_C_HOSTAP)
392 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
393 if (ic->ic_caps & IEEE80211_C_AHDEMO)
394 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
395 if (ic->ic_caps & IEEE80211_C_MONITOR)
396 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
397 if (mode == IEEE80211_MODE_AUTO)
398 continue;
399 rs = &ic->ic_sup_rates[mode];
400 for (i = 0; i < rs->rs_nrates; i++) {
401 rate = rs->rs_rates[i];
402 mword = ieee80211_rate2media(ic, rate, mode);
403 if (mword == 0)
404 continue;
405 ADD(ic, mword, mopt);
406 if (ic->ic_caps & IEEE80211_C_IBSS)
407 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
408 if (ic->ic_caps & IEEE80211_C_HOSTAP)
409 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
410 if (ic->ic_caps & IEEE80211_C_AHDEMO)
411 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
412 if (ic->ic_caps & IEEE80211_C_MONITOR)
413 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
414 /*
415 * Add rate to the collection of all rates.
416 */
417 r = rate & IEEE80211_RATE_VAL;
418 for (j = 0; j < allrates.rs_nrates; j++)
419 if (allrates.rs_rates[j] == r)
420 break;
421 if (j == allrates.rs_nrates) {
422 /* unique, add to the set */
423 allrates.rs_rates[j] = r;
424 allrates.rs_nrates++;
425 }
426 rate = (rate & IEEE80211_RATE_VAL) / 2;
427 if (rate > maxrate)
428 maxrate = rate;
429 }
430 }
431 for (i = 0; i < allrates.rs_nrates; i++) {
432 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
433 IEEE80211_MODE_AUTO);
434 if (mword == 0)
435 continue;
436 mword = IFM_SUBTYPE(mword); /* remove media options */
437 ADD(ic, mword, 0);
438 if (ic->ic_caps & IEEE80211_C_IBSS)
439 ADD(ic, mword, IFM_IEEE80211_ADHOC);
440 if (ic->ic_caps & IEEE80211_C_HOSTAP)
441 ADD(ic, mword, IFM_IEEE80211_HOSTAP);
442 if (ic->ic_caps & IEEE80211_C_AHDEMO)
443 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
444 if (ic->ic_caps & IEEE80211_C_MONITOR)
445 ADD(ic, mword, IFM_IEEE80211_MONITOR);
446 }
447 ieee80211_media_status(ifp, &imr);
448 ifmedia_set(&ic->ic_media, imr.ifm_active);
449
450 if (maxrate)
451 ifp->if_baudrate = IF_Mbps(maxrate);
452 #undef ADD
453 }
454
455 void
456 ieee80211_announce(struct ieee80211com *ic)
457 {
458 struct ifnet *ifp = ic->ic_ifp;
459 int i, mode, rate, mword;
460 struct ieee80211_rateset *rs;
461
462 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) {
463 if ((ic->ic_modecaps & (1<<mode)) == 0)
464 continue;
465 aprint_normal("%s: %s rates: ", ifp->if_xname,
466 ieee80211_phymode_name[mode]);
467 rs = &ic->ic_sup_rates[mode];
468 for (i = 0; i < rs->rs_nrates; i++) {
469 rate = rs->rs_rates[i];
470 mword = ieee80211_rate2media(ic, rate, mode);
471 if (mword == 0)
472 continue;
473 aprint_normal("%s%d%sMbps", (i != 0 ? " " : ""),
474 (rate & IEEE80211_RATE_VAL) / 2,
475 ((rate & 0x1) != 0 ? ".5" : ""));
476 }
477 aprint_normal("\n");
478 }
479 }
480
481 static int
482 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
483 {
484 #define IEEERATE(_ic,_m,_i) \
485 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
486 int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
487 for (i = 0; i < nrates; i++)
488 if (IEEERATE(ic, mode, i) == rate)
489 return i;
490 return -1;
491 #undef IEEERATE
492 }
493
494 /*
495 * Find an instance by its mac address.
496 */
497 struct ieee80211com *
498 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN])
499 {
500 int s;
501 struct ieee80211com *ic;
502
503 s = splnet();
504 SLIST_FOREACH(ic, &ieee80211_list, ic_next)
505 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr))
506 break;
507 splx(s);
508 return ic;
509 }
510
511 static struct ieee80211com *
512 ieee80211_find_instance(struct ifnet *ifp)
513 {
514 int s;
515 struct ieee80211com *ic;
516
517 s = splnet();
518 /* XXX not right for multiple instances but works for now */
519 SLIST_FOREACH(ic, &ieee80211_list, ic_next)
520 if (ic->ic_ifp == ifp)
521 break;
522 splx(s);
523 return ic;
524 }
525
526 /*
527 * Handle a media change request.
528 */
529 int
530 ieee80211_media_change(struct ifnet *ifp)
531 {
532 struct ieee80211com *ic;
533 struct ifmedia_entry *ime;
534 enum ieee80211_opmode newopmode;
535 enum ieee80211_phymode newphymode;
536 int i, j, newrate, error = 0;
537
538 ic = ieee80211_find_instance(ifp);
539 if (!ic) {
540 if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
541 return EINVAL;
542 }
543 ime = ic->ic_media.ifm_cur;
544 /*
545 * First, identify the phy mode.
546 */
547 switch (IFM_MODE(ime->ifm_media)) {
548 case IFM_IEEE80211_11A:
549 newphymode = IEEE80211_MODE_11A;
550 break;
551 case IFM_IEEE80211_11B:
552 newphymode = IEEE80211_MODE_11B;
553 break;
554 case IFM_IEEE80211_11G:
555 newphymode = IEEE80211_MODE_11G;
556 break;
557 case IFM_IEEE80211_FH:
558 newphymode = IEEE80211_MODE_FH;
559 break;
560 case IFM_AUTO:
561 newphymode = IEEE80211_MODE_AUTO;
562 break;
563 default:
564 return EINVAL;
565 }
566 /*
567 * Turbo mode is an ``option''.
568 * XXX does not apply to AUTO
569 */
570 if (ime->ifm_media & IFM_IEEE80211_TURBO) {
571 if (newphymode == IEEE80211_MODE_11A)
572 newphymode = IEEE80211_MODE_TURBO_A;
573 else if (newphymode == IEEE80211_MODE_11G)
574 newphymode = IEEE80211_MODE_TURBO_G;
575 else
576 return EINVAL;
577 }
578 /*
579 * Validate requested mode is available.
580 */
581 if ((ic->ic_modecaps & (1<<newphymode)) == 0)
582 return EINVAL;
583
584 /*
585 * Next, the fixed/variable rate.
586 */
587 i = -1;
588 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
589 /*
590 * Convert media subtype to rate.
591 */
592 newrate = ieee80211_media2rate(ime->ifm_media);
593 if (newrate == 0)
594 return EINVAL;
595 /*
596 * Check the rate table for the specified/current phy.
597 */
598 if (newphymode == IEEE80211_MODE_AUTO) {
599 /*
600 * In autoselect mode search for the rate.
601 */
602 for (j = IEEE80211_MODE_11A;
603 j < IEEE80211_MODE_MAX; j++) {
604 if ((ic->ic_modecaps & (1<<j)) == 0)
605 continue;
606 i = findrate(ic, j, newrate);
607 if (i != -1) {
608 /* lock mode too */
609 newphymode = j;
610 break;
611 }
612 }
613 } else {
614 i = findrate(ic, newphymode, newrate);
615 }
616 if (i == -1) /* mode/rate mismatch */
617 return EINVAL;
618 }
619 /* NB: defer rate setting to later */
620
621 /*
622 * Deduce new operating mode but don't install it just yet.
623 */
624 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
625 (IFM_IEEE80211_ADHOC|IFM_FLAG0))
626 newopmode = IEEE80211_M_AHDEMO;
627 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
628 newopmode = IEEE80211_M_HOSTAP;
629 else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
630 newopmode = IEEE80211_M_IBSS;
631 else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
632 newopmode = IEEE80211_M_MONITOR;
633 else
634 newopmode = IEEE80211_M_STA;
635
636 #ifndef IEEE80211_NO_HOSTAP
637 /*
638 * Autoselect doesn't make sense when operating as an AP.
639 * If no phy mode has been selected, pick one and lock it
640 * down so rate tables can be used in forming beacon frames
641 * and the like.
642 */
643 if (newopmode == IEEE80211_M_HOSTAP &&
644 newphymode == IEEE80211_MODE_AUTO) {
645 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
646 if (ic->ic_modecaps & (1<<j)) {
647 newphymode = j;
648 break;
649 }
650 }
651 #endif /* !IEEE80211_NO_HOSTAP */
652
653 /*
654 * Handle phy mode change.
655 */
656 if (ic->ic_curmode != newphymode) { /* change phy mode */
657 error = ieee80211_setmode(ic, newphymode);
658 if (error != 0)
659 return error;
660 error = ENETRESET;
661 }
662
663 /*
664 * Committed to changes, install the rate setting.
665 */
666 if (ic->ic_fixed_rate != i) {
667 ic->ic_fixed_rate = i; /* set fixed tx rate */
668 error = ENETRESET;
669 }
670
671 /*
672 * Handle operating mode change.
673 */
674 if (ic->ic_opmode != newopmode) {
675 ic->ic_opmode = newopmode;
676 switch (newopmode) {
677 case IEEE80211_M_AHDEMO:
678 case IEEE80211_M_HOSTAP:
679 case IEEE80211_M_STA:
680 case IEEE80211_M_MONITOR:
681 ic->ic_flags &= ~IEEE80211_F_IBSSON;
682 break;
683 case IEEE80211_M_IBSS:
684 ic->ic_flags |= IEEE80211_F_IBSSON;
685 break;
686 }
687 /*
688 * Yech, slot time may change depending on the
689 * operating mode so reset it to be sure everything
690 * is setup appropriately.
691 */
692 ieee80211_reset_erp(ic);
693 ieee80211_wme_initparams(ic); /* after opmode change */
694 error = ENETRESET;
695 }
696 #ifdef notdef
697 if (error == 0)
698 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
699 #endif
700 return error;
701 }
702
703 void
704 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
705 {
706 struct ieee80211com *ic;
707 struct ieee80211_rateset *rs;
708
709 ic = ieee80211_find_instance(ifp);
710 if (!ic) {
711 if_printf(ifp, "%s: no 802.11 instance!\n", __func__);
712 return;
713 }
714 imr->ifm_status = IFM_AVALID;
715 imr->ifm_active = IFM_IEEE80211;
716 if (ic->ic_state == IEEE80211_S_RUN)
717 imr->ifm_status |= IFM_ACTIVE;
718 /*
719 * Calculate a current rate if possible.
720 */
721 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) {
722 /*
723 * A fixed rate is set, report that.
724 */
725 rs = &ic->ic_sup_rates[ic->ic_curmode];
726 imr->ifm_active |= ieee80211_rate2media(ic,
727 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode);
728 } else if (ic->ic_opmode == IEEE80211_M_STA) {
729 /*
730 * In station mode report the current transmit rate.
731 */
732 rs = &ic->ic_bss->ni_rates;
733 imr->ifm_active |= ieee80211_rate2media(ic,
734 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode);
735 } else
736 imr->ifm_active |= IFM_AUTO;
737 switch (ic->ic_opmode) {
738 case IEEE80211_M_STA:
739 break;
740 case IEEE80211_M_IBSS:
741 imr->ifm_active |= IFM_IEEE80211_ADHOC;
742 break;
743 case IEEE80211_M_AHDEMO:
744 /* should not come here */
745 break;
746 case IEEE80211_M_HOSTAP:
747 imr->ifm_active |= IFM_IEEE80211_HOSTAP;
748 break;
749 case IEEE80211_M_MONITOR:
750 imr->ifm_active |= IFM_IEEE80211_MONITOR;
751 break;
752 }
753 switch (ic->ic_curmode) {
754 case IEEE80211_MODE_11A:
755 imr->ifm_active |= IFM_IEEE80211_11A;
756 break;
757 case IEEE80211_MODE_11B:
758 imr->ifm_active |= IFM_IEEE80211_11B;
759 break;
760 case IEEE80211_MODE_11G:
761 imr->ifm_active |= IFM_IEEE80211_11G;
762 break;
763 case IEEE80211_MODE_FH:
764 imr->ifm_active |= IFM_IEEE80211_FH;
765 break;
766 case IEEE80211_MODE_TURBO_A:
767 imr->ifm_active |= IFM_IEEE80211_11A
768 | IFM_IEEE80211_TURBO;
769 break;
770 case IEEE80211_MODE_TURBO_G:
771 imr->ifm_active |= IFM_IEEE80211_11G
772 | IFM_IEEE80211_TURBO;
773 break;
774 }
775 }
776
777 void
778 ieee80211_watchdog(struct ieee80211com *ic)
779 {
780 struct ieee80211_node_table *nt;
781 int need_inact_timer = 0;
782
783 if (ic->ic_state != IEEE80211_S_INIT) {
784 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
785 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0);
786 nt = &ic->ic_scan;
787 if (nt->nt_inact_timer) {
788 if (--nt->nt_inact_timer == 0)
789 nt->nt_timeout(nt);
790 need_inact_timer += nt->nt_inact_timer;
791 }
792 nt = &ic->ic_sta;
793 if (nt->nt_inact_timer) {
794 if (--nt->nt_inact_timer == 0)
795 nt->nt_timeout(nt);
796 need_inact_timer += nt->nt_inact_timer;
797 }
798 }
799 if (ic->ic_mgt_timer != 0 || need_inact_timer)
800 ic->ic_ifp->if_timer = 1;
801 }
802
803 const struct ieee80211_rateset ieee80211_std_rateset_11a =
804 { 8, { 12, 18, 24, 36, 48, 72, 96, 108 } };
805
806 const struct ieee80211_rateset ieee80211_std_rateset_11b =
807 { 4, { 2, 4, 11, 22 } };
808
809 const struct ieee80211_rateset ieee80211_std_rateset_11g =
810 { 12, { 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 } };
811
812 /*
813 * Set the current phy mode and recalculate the active channel
814 * set based on the available channels for this mode. Also
815 * select a new default/current channel if the current one is
816 * inappropriate for this mode.
817 */
818 int
819 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
820 {
821 #define N(a) (sizeof(a) / sizeof(a[0]))
822 static const u_int chanflags[] = {
823 0, /* IEEE80211_MODE_AUTO */
824 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
825 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
826 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
827 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */
828 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */
829 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */
830 };
831 struct ieee80211_channel *c;
832 u_int modeflags;
833 int i;
834
835 /* validate new mode */
836 if ((ic->ic_modecaps & (1<<mode)) == 0) {
837 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
838 "%s: mode %u not supported (caps 0x%x)\n",
839 __func__, mode, ic->ic_modecaps);
840 return EINVAL;
841 }
842
843 /*
844 * Verify at least one channel is present in the available
845 * channel list before committing to the new mode.
846 */
847 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode));
848 modeflags = chanflags[mode];
849 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
850 c = &ic->ic_channels[i];
851 if (c->ic_flags == 0)
852 continue;
853 if (mode == IEEE80211_MODE_AUTO) {
854 /* ignore turbo channels for autoselect */
855 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0)
856 break;
857 } else {
858 if ((c->ic_flags & modeflags) == modeflags)
859 break;
860 }
861 }
862 if (i > IEEE80211_CHAN_MAX) {
863 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
864 "%s: no channels found for mode %u\n", __func__, mode);
865 return EINVAL;
866 }
867
868 /*
869 * Calculate the active channel set.
870 */
871 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
872 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
873 c = &ic->ic_channels[i];
874 if (c->ic_flags == 0)
875 continue;
876 if (mode == IEEE80211_MODE_AUTO) {
877 /* take anything but pure turbo channels */
878 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0)
879 setbit(ic->ic_chan_active, i);
880 } else {
881 if ((c->ic_flags & modeflags) == modeflags)
882 setbit(ic->ic_chan_active, i);
883 }
884 }
885 /*
886 * If no current/default channel is setup or the current
887 * channel is wrong for the mode then pick the first
888 * available channel from the active list. This is likely
889 * not the right one.
890 */
891 if (ic->ic_ibss_chan == NULL ||
892 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
893 for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
894 if (isset(ic->ic_chan_active, i)) {
895 ic->ic_ibss_chan = &ic->ic_channels[i];
896 break;
897 }
898 IASSERT(ic->ic_ibss_chan != NULL &&
899 isset(ic->ic_chan_active,
900 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)),
901 ("Bad IBSS channel %u",
902 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)));
903 }
904 /*
905 * If the desired channel is set but no longer valid then reset it.
906 */
907 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
908 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan)))
909 ic->ic_des_chan = IEEE80211_CHAN_ANYC;
910
911 /*
912 * Do mode-specific rate setup.
913 */
914 if (mode == IEEE80211_MODE_11G) {
915 /*
916 * Use a mixed 11b/11g rate set.
917 */
918 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
919 IEEE80211_MODE_11G);
920 } else if (mode == IEEE80211_MODE_11B) {
921 /*
922 * Force pure 11b rate set.
923 */
924 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
925 IEEE80211_MODE_11B);
926 }
927 /*
928 * Setup an initial rate set according to the
929 * current/default channel selected above. This
930 * will be changed when scanning but must exist
931 * now so driver have a consistent state of ic_ibss_chan.
932 */
933 if (ic->ic_bss) /* NB: can be called before lateattach */
934 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode];
935
936 ic->ic_curmode = mode;
937 ieee80211_reset_erp(ic); /* reset ERP state */
938 ieee80211_wme_initparams(ic); /* reset WME stat */
939
940 return 0;
941 #undef N
942 }
943
944 /*
945 * Return the phy mode for with the specified channel so the
946 * caller can select a rate set. This is problematic for channels
947 * where multiple operating modes are possible (e.g. 11g+11b).
948 * In those cases we defer to the current operating mode when set.
949 */
950 enum ieee80211_phymode
951 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
952 {
953 if (IEEE80211_IS_CHAN_T(chan)) {
954 return IEEE80211_MODE_TURBO_A;
955 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) {
956 return IEEE80211_MODE_11A;
957 } else if (IEEE80211_IS_CHAN_FHSS(chan))
958 return IEEE80211_MODE_FH;
959 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) {
960 /*
961 * This assumes all 11g channels are also usable
962 * for 11b, which is currently true.
963 */
964 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G)
965 return IEEE80211_MODE_TURBO_G;
966 if (ic->ic_curmode == IEEE80211_MODE_11B)
967 return IEEE80211_MODE_11B;
968 return IEEE80211_MODE_11G;
969 } else
970 return IEEE80211_MODE_11B;
971 }
972
973 /*
974 * convert IEEE80211 rate value to ifmedia subtype.
975 * ieee80211 rate is in unit of 0.5Mbps.
976 */
977 int
978 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
979 {
980 #define N(a) (sizeof(a) / sizeof(a[0]))
981 static const struct {
982 u_int m; /* rate + mode */
983 u_int r; /* if_media rate */
984 } rates[] = {
985 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
986 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
987 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
988 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
989 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
990 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
991 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
992 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
993 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
994 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
995 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
996 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
997 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
998 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
999 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
1000 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
1001 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
1002 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
1003 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
1004 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
1005 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
1006 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
1007 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
1008 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
1009 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
1010 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
1011 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
1012 /* NB: OFDM72 doesn't realy exist so we don't handle it */
1013 };
1014 u_int mask, i;
1015
1016 mask = rate & IEEE80211_RATE_VAL;
1017 switch (mode) {
1018 case IEEE80211_MODE_11A:
1019 case IEEE80211_MODE_TURBO_A:
1020 mask |= IFM_IEEE80211_11A;
1021 break;
1022 case IEEE80211_MODE_11B:
1023 mask |= IFM_IEEE80211_11B;
1024 break;
1025 case IEEE80211_MODE_FH:
1026 mask |= IFM_IEEE80211_FH;
1027 break;
1028 case IEEE80211_MODE_AUTO:
1029 /* NB: ic may be NULL for some drivers */
1030 if (ic && ic->ic_phytype == IEEE80211_T_FH) {
1031 mask |= IFM_IEEE80211_FH;
1032 break;
1033 }
1034 /* NB: hack, 11g matches both 11b+11a rates */
1035 /* fall thru... */
1036 case IEEE80211_MODE_11G:
1037 case IEEE80211_MODE_TURBO_G:
1038 mask |= IFM_IEEE80211_11G;
1039 break;
1040 }
1041 for (i = 0; i < N(rates); i++)
1042 if (rates[i].m == mask)
1043 return rates[i].r;
1044 return IFM_AUTO;
1045 #undef N
1046 }
1047
1048 int
1049 ieee80211_media2rate(int mword)
1050 {
1051 #define N(a) (sizeof(a) / sizeof(a[0]))
1052 static const int ieeerates[] = {
1053 -1, /* IFM_AUTO */
1054 0, /* IFM_MANUAL */
1055 0, /* IFM_NONE */
1056 2, /* IFM_IEEE80211_FH1 */
1057 4, /* IFM_IEEE80211_FH2 */
1058 4, /* IFM_IEEE80211_DS2 */
1059 11, /* IFM_IEEE80211_DS5 */
1060 22, /* IFM_IEEE80211_DS11 */
1061 2, /* IFM_IEEE80211_DS1 */
1062 44, /* IFM_IEEE80211_DS22 */
1063 12, /* IFM_IEEE80211_OFDM6 */
1064 18, /* IFM_IEEE80211_OFDM9 */
1065 24, /* IFM_IEEE80211_OFDM12 */
1066 36, /* IFM_IEEE80211_OFDM18 */
1067 48, /* IFM_IEEE80211_OFDM24 */
1068 72, /* IFM_IEEE80211_OFDM36 */
1069 96, /* IFM_IEEE80211_OFDM48 */
1070 108, /* IFM_IEEE80211_OFDM54 */
1071 144, /* IFM_IEEE80211_OFDM72 */
1072 };
1073 return IFM_SUBTYPE(mword) < N(ieeerates) ?
1074 ieeerates[IFM_SUBTYPE(mword)] : 0;
1075 #undef N
1076 }
1077