1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005-2008 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 /*
32 * IEEE 802.11 regdomain support.
33 */
34 #include "opt_wlan.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40 #include <sys/socket.h>
41
42 #include <net/if.h>
43 #include <net/if_var.h>
44 #include <net/if_media.h>
45 #include <net/ethernet.h>
46
47 #include <net80211/ieee80211_var.h>
48 #include <net80211/ieee80211_regdomain.h>
49
50 static void
51 null_getradiocaps(struct ieee80211com *ic, int maxchan,
52 int *n, struct ieee80211_channel *c)
53 {
54 /* just feed back the current channel list */
55 if (maxchan > ic->ic_nchans)
56 maxchan = ic->ic_nchans;
57 memcpy(c, ic->ic_channels, maxchan*sizeof(struct ieee80211_channel));
58 *n = maxchan;
59 }
60
61 static int
62 null_setregdomain(struct ieee80211com *ic,
63 struct ieee80211_regdomain *rd,
64 int nchans, struct ieee80211_channel chans[])
65 {
66 return 0; /* accept anything */
67 }
68
69 void
70 ieee80211_regdomain_attach(struct ieee80211com *ic)
71 {
72 if (ic->ic_regdomain.regdomain == 0 &&
73 ic->ic_regdomain.country == CTRY_DEFAULT) {
74 ic->ic_regdomain.location = ' '; /* both */
75 /* NB: driver calls ieee80211_init_channels or similar */
76 }
77 ic->ic_getradiocaps = null_getradiocaps;
78 ic->ic_setregdomain = null_setregdomain;
79 }
80
81 void
82 ieee80211_regdomain_detach(struct ieee80211com *ic)
83 {
84 if (ic->ic_countryie != NULL) {
85 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
86 ic->ic_countryie = NULL;
87 }
88 }
89
90 void
91 ieee80211_regdomain_vattach(struct ieee80211vap *vap)
92 {
93 }
94
95 void
96 ieee80211_regdomain_vdetach(struct ieee80211vap *vap)
97 {
98 }
99
100 static const uint8_t def_chan_2ghz[] =
101 { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
102 static const uint8_t def_chan_5ghz_band1[] =
103 { 36, 40, 44, 48, 52, 56, 60, 64 };
104 static const uint8_t def_chan_5ghz_band2[] =
105 { 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 };
106 static const uint8_t def_chan_5ghz_band3[] =
107 { 149, 153, 157, 161 };
108
109 /*
110 * Setup the channel list for the specified regulatory domain,
111 * country code, and operating modes. This interface is used
112 * when a driver does not obtain the channel list from another
113 * source (such as firmware).
114 */
115 int
116 ieee80211_init_channels(struct ieee80211com *ic,
117 const struct ieee80211_regdomain *rd, const uint8_t bands[])
118 {
119 struct ieee80211_channel *chans = ic->ic_channels;
120 int *nchans = &ic->ic_nchans;
121 int cbw_flags;
122
123 /* XXX just do something for now */
124 cbw_flags = (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) ?
125 NET80211_CBW_FLAG_HT40 : 0;
126 *nchans = 0;
127 if (isset(bands, IEEE80211_MODE_11B) ||
128 isset(bands, IEEE80211_MODE_11G) ||
129 isset(bands, IEEE80211_MODE_11NG)) {
130 int nchan = nitems(def_chan_2ghz);
131 if (!(rd != NULL && rd->ecm))
132 nchan -= 3;
133
134 ieee80211_add_channel_list_2ghz(chans, IEEE80211_CHAN_MAX,
135 nchans, def_chan_2ghz, nchan, bands, cbw_flags);
136 }
137 /* XXX IEEE80211_MODE_VHT_2GHZ if we really want to. */
138
139 if (isset(bands, IEEE80211_MODE_11A) ||
140 isset(bands, IEEE80211_MODE_11NA)) {
141 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
142 nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1),
143 bands, cbw_flags);
144 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
145 nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2),
146 bands, cbw_flags);
147 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
148 nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3),
149 bands, cbw_flags);
150 }
151 if (isset(bands, IEEE80211_MODE_VHT_5GHZ)) {
152 cbw_flags |= NET80211_CBW_FLAG_HT40; /* Make sure this is set; or assert? */
153 cbw_flags |= NET80211_CBW_FLAG_VHT80;
154 if (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(ic->ic_vhtcaps))
155 cbw_flags |= NET80211_CBW_FLAG_VHT160;
156 if (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(
157 ic->ic_vhtcaps))
158 cbw_flags |= NET80211_CBW_FLAG_VHT80P80;
159 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
160 nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1),
161 bands, cbw_flags);
162 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
163 nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2),
164 bands, cbw_flags);
165 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX,
166 nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3),
167 bands, cbw_flags);
168 }
169 if (rd != NULL)
170 ic->ic_regdomain = *rd;
171
172 return 0;
173 }
174
175 static __inline int
176 chancompar(const void *a, const void *b)
177 {
178 const struct ieee80211_channel *ca = a;
179 const struct ieee80211_channel *cb = b;
180
181 return (ca->ic_freq == cb->ic_freq) ?
182 (ca->ic_flags & IEEE80211_CHAN_ALL) -
183 (cb->ic_flags & IEEE80211_CHAN_ALL) :
184 ca->ic_freq - cb->ic_freq;
185 }
186
187 /*
188 * Insertion sort.
189 */
190 #define swap(_a, _b, _size) { \
191 uint8_t *s = _b; \
192 int i = _size; \
193 do { \
194 uint8_t tmp = *_a; \
195 *_a++ = *s; \
196 *s++ = tmp; \
197 } while (--i); \
198 _a -= _size; \
199 }
200
201 static void
202 sort_channels(void *a, size_t n, size_t size)
203 {
204 uint8_t *aa = a;
205 uint8_t *ai, *t;
206
207 KASSERT(n > 0, ("no channels"));
208 for (ai = aa+size; --n >= 1; ai += size)
209 for (t = ai; t > aa; t -= size) {
210 uint8_t *u = t - size;
211 if (chancompar(u, t) <= 0)
212 break;
213 swap(u, t, size);
214 }
215 }
216 #undef swap
217
218 /*
219 * Order channels w/ the same frequency so that
220 * b < g < htg and a < hta. This is used to optimize
221 * channel table lookups and some user applications
222 * may also depend on it (though they should not).
223 */
224 void
225 ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans)
226 {
227 if (nchans > 0)
228 sort_channels(chans, nchans, sizeof(struct ieee80211_channel));
229 }
230
231 /*
232 * Allocate and construct a Country Information IE.
233 */
234 struct ieee80211_appie *
235 ieee80211_alloc_countryie(struct ieee80211com *ic)
236 {
237 #define CHAN_UNINTERESTING \
238 (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \
239 IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER)
240 /* XXX what about auto? */
241 /* flag set of channels to be excluded (band added below) */
242 static const int skipflags[IEEE80211_MODE_MAX] = {
243 [IEEE80211_MODE_AUTO] = CHAN_UNINTERESTING,
244 [IEEE80211_MODE_11A] = CHAN_UNINTERESTING,
245 [IEEE80211_MODE_11B] = CHAN_UNINTERESTING,
246 [IEEE80211_MODE_11G] = CHAN_UNINTERESTING,
247 [IEEE80211_MODE_FH] = CHAN_UNINTERESTING
248 | IEEE80211_CHAN_OFDM
249 | IEEE80211_CHAN_CCK
250 | IEEE80211_CHAN_DYN,
251 [IEEE80211_MODE_TURBO_A] = CHAN_UNINTERESTING,
252 [IEEE80211_MODE_TURBO_G] = CHAN_UNINTERESTING,
253 [IEEE80211_MODE_STURBO_A] = CHAN_UNINTERESTING,
254 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_TURBO
255 | IEEE80211_CHAN_STURBO,
256 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_TURBO
257 | IEEE80211_CHAN_STURBO,
258 [IEEE80211_MODE_11NA] = CHAN_UNINTERESTING,
259 [IEEE80211_MODE_11NG] = CHAN_UNINTERESTING,
260 };
261 const struct ieee80211_regdomain *rd = &ic->ic_regdomain;
262 uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm;
263 struct ieee80211_appie *aie;
264 struct ieee80211_country_ie *ie;
265 int i, skip, nruns;
266
267 aie = IEEE80211_MALLOC(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE,
268 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
269 if (aie == NULL) {
270 ic_printf(ic, "%s: unable to allocate memory for country ie\n",
271 __func__);
272 /* XXX stat */
273 return NULL;
274 }
275 ie = (struct ieee80211_country_ie *) aie->ie_data;
276 ie->ie = IEEE80211_ELEMID_COUNTRY;
277 if (rd->isocc[0] == '\0') {
278 ic_printf(ic, "no ISO country string for cc %d; using blanks\n",
279 rd->country);
280 ie->cc[0] = ie->cc[1] = ' ';
281 } else {
282 ie->cc[0] = rd->isocc[0];
283 ie->cc[1] = rd->isocc[1];
284 }
285 /*
286 * Indoor/Outdoor portion of country string:
287 * 'I' indoor only
288 * 'O' outdoor only
289 * ' ' all environments
290 */
291 ie->cc[2] = (rd->location == 'I' ? 'I' :
292 rd->location == 'O' ? 'O' : ' ');
293 /*
294 * Run-length encoded channel+max tx power info.
295 */
296 frm = (uint8_t *)&ie->band[0];
297 nextchan = 0; /* NB: impossible channel # */
298 nruns = 0;
299 memset(chans, 0, sizeof(chans));
300 skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)];
301 if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan))
302 skip |= IEEE80211_CHAN_2GHZ;
303 else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan))
304 skip |= IEEE80211_CHAN_5GHZ;
305 for (i = 0; i < ic->ic_nchans; i++) {
306 const struct ieee80211_channel *c = &ic->ic_channels[i];
307
308 if (isset(chans, c->ic_ieee)) /* suppress dup's */
309 continue;
310 if (c->ic_flags & skip) /* skip band, etc. */
311 continue;
312 setbit(chans, c->ic_ieee);
313 if (c->ic_ieee != nextchan ||
314 c->ic_maxregpower != frm[-1]) { /* new run */
315 if (nruns == IEEE80211_COUNTRY_MAX_BANDS) {
316 ic_printf(ic, "%s: country ie too big, "
317 "runs > max %d, truncating\n",
318 __func__, IEEE80211_COUNTRY_MAX_BANDS);
319 /* XXX stat? fail? */
320 break;
321 }
322 frm[0] = c->ic_ieee; /* starting channel # */
323 frm[1] = 1; /* # channels in run */
324 frm[2] = c->ic_maxregpower; /* tx power cap */
325 frm += 3;
326 nextchan = c->ic_ieee + 1; /* overflow? */
327 nruns++;
328 } else { /* extend run */
329 frm[-2]++;
330 nextchan++;
331 }
332 }
333 ie->len = frm - ie->cc;
334 if (ie->len & 1) { /* Zero pad to multiple of 2 */
335 ie->len++;
336 *frm++ = 0;
337 }
338 aie->ie_len = frm - aie->ie_data;
339
340 return aie;
341 #undef CHAN_UNINTERESTING
342 }
343
344 static int
345 allvapsdown(struct ieee80211com *ic)
346 {
347 struct ieee80211vap *vap;
348
349 IEEE80211_LOCK_ASSERT(ic);
350 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
351 if (vap->iv_state != IEEE80211_S_INIT)
352 return 0;
353 return 1;
354 }
355
356 int
357 ieee80211_setregdomain(struct ieee80211vap *vap,
358 struct ieee80211_regdomain_req *reg)
359 {
360 struct ieee80211com *ic = vap->iv_ic;
361 struct ieee80211_channel *c;
362 int desfreq = 0, desflags = 0; /* XXX silence gcc complaint */
363 int error, i;
364
365 if (reg->rd.location != 'I' && reg->rd.location != 'O' &&
366 reg->rd.location != ' ') {
367 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
368 "%s: invalid location 0x%x\n", __func__, reg->rd.location);
369 return EINVAL;
370 }
371 if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') {
372 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
373 "%s: invalid iso cc 0x%x:0x%x\n", __func__,
374 reg->rd.isocc[0], reg->rd.isocc[1]);
375 return EINVAL;
376 }
377 if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) {
378 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
379 "%s: too many channels %u, max %u\n", __func__,
380 reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX);
381 return EINVAL;
382 }
383 /*
384 * Calculate freq<->IEEE mapping and default max tx power
385 * for channels not setup. The driver can override these
386 * setting to reflect device properties/requirements.
387 */
388 for (i = 0; i < reg->chaninfo.ic_nchans; i++) {
389 c = ®->chaninfo.ic_chans[i];
390 if (c->ic_freq == 0 || c->ic_flags == 0) {
391 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
392 "%s: invalid channel spec at [%u]\n", __func__, i);
393 return EINVAL;
394 }
395 if (c->ic_maxregpower == 0) {
396 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
397 "%s: invalid channel spec, zero maxregpower, "
398 "freq %u flags 0x%x\n", __func__,
399 c->ic_freq, c->ic_flags);
400 return EINVAL;
401 }
402 if (c->ic_ieee == 0)
403 c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
404 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
405 c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
406 (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
407 c->ic_flags);
408 if (c->ic_maxpower == 0)
409 c->ic_maxpower = 2*c->ic_maxregpower;
410 }
411 IEEE80211_LOCK(ic);
412 /* XXX bandaid; a running vap will likely crash */
413 if (!allvapsdown(ic)) {
414 IEEE80211_UNLOCK(ic);
415 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
416 "%s: reject: vaps are running\n", __func__);
417 return EBUSY;
418 }
419 error = ic->ic_setregdomain(ic, ®->rd,
420 reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans);
421 if (error != 0) {
422 IEEE80211_UNLOCK(ic);
423 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL,
424 "%s: driver rejected request, error %u\n", __func__, error);
425 return error;
426 }
427 /*
428 * Commit: copy in new channel table and reset media state.
429 * On return the state machines will be clocked so all vaps
430 * will reset their state.
431 *
432 * XXX ic_bsschan is marked undefined, must have vap's in
433 * INIT state or we blow up forcing stations off
434 */
435 /*
436 * Save any desired channel for restore below. Note this
437 * needs to be done for all vaps but for now we only do
438 * the one where the ioctl is issued.
439 */
440 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
441 desfreq = vap->iv_des_chan->ic_freq;
442 desflags = vap->iv_des_chan->ic_flags;
443 }
444 /* regdomain parameters */
445 memcpy(&ic->ic_regdomain, ®->rd, sizeof(reg->rd));
446 /* channel table */
447 memcpy(ic->ic_channels, reg->chaninfo.ic_chans,
448 reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel));
449 ic->ic_nchans = reg->chaninfo.ic_nchans;
450 memset(&ic->ic_channels[ic->ic_nchans], 0,
451 (IEEE80211_CHAN_MAX - ic->ic_nchans) *
452 sizeof(struct ieee80211_channel));
453 ieee80211_chan_init(ic);
454
455 /*
456 * Invalidate channel-related state.
457 */
458 if (ic->ic_countryie != NULL) {
459 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
460 ic->ic_countryie = NULL;
461 }
462 ieee80211_scan_flush(vap);
463 ieee80211_dfs_reset(ic);
464 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) {
465 c = ieee80211_find_channel(ic, desfreq, desflags);
466 /* NB: may be NULL if not present in new channel list */
467 vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC;
468 }
469 IEEE80211_UNLOCK(ic);
470
471 return 0;
472 }
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