Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_regdomain.c
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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: releng/12.0/sys/net80211/ieee80211_regdomain.c 326272 2017-11-27 15:23:17Z pfg $"); 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 ht40; 122 123 /* XXX just do something for now */ 124 ht40 = !!(ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40); 125 *nchans = 0; 126 if (isset(bands, IEEE80211_MODE_11B) || 127 isset(bands, IEEE80211_MODE_11G) || 128 isset(bands, IEEE80211_MODE_11NG)) { 129 int nchan = nitems(def_chan_2ghz); 130 if (!(rd != NULL && rd->ecm)) 131 nchan -= 3; 132 133 ieee80211_add_channel_list_2ghz(chans, IEEE80211_CHAN_MAX, 134 nchans, def_chan_2ghz, nchan, bands, ht40); 135 } 136 if (isset(bands, IEEE80211_MODE_11A) || 137 isset(bands, IEEE80211_MODE_11NA)) { 138 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX, 139 nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1), 140 bands, ht40); 141 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX, 142 nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2), 143 bands, ht40); 144 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX, 145 nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3), 146 bands, ht40); 147 } 148 if (rd != NULL) 149 ic->ic_regdomain = *rd; 150 151 return 0; 152 } 153 154 static __inline int 155 chancompar(const void *a, const void *b) 156 { 157 const struct ieee80211_channel *ca = a; 158 const struct ieee80211_channel *cb = b; 159 160 return (ca->ic_freq == cb->ic_freq) ? 161 (ca->ic_flags & IEEE80211_CHAN_ALL) - 162 (cb->ic_flags & IEEE80211_CHAN_ALL) : 163 ca->ic_freq - cb->ic_freq; 164 } 165 166 /* 167 * Insertion sort. 168 */ 169 #define swap(_a, _b, _size) { \ 170 uint8_t *s = _b; \ 171 int i = _size; \ 172 do { \ 173 uint8_t tmp = *_a; \ 174 *_a++ = *s; \ 175 *s++ = tmp; \ 176 } while (--i); \ 177 _a -= _size; \ 178 } 179 180 static void 181 sort_channels(void *a, size_t n, size_t size) 182 { 183 uint8_t *aa = a; 184 uint8_t *ai, *t; 185 186 KASSERT(n > 0, ("no channels")); 187 for (ai = aa+size; --n >= 1; ai += size) 188 for (t = ai; t > aa; t -= size) { 189 uint8_t *u = t - size; 190 if (chancompar(u, t) <= 0) 191 break; 192 swap(u, t, size); 193 } 194 } 195 #undef swap 196 197 /* 198 * Order channels w/ the same frequency so that 199 * b < g < htg and a < hta. This is used to optimize 200 * channel table lookups and some user applications 201 * may also depend on it (though they should not). 202 */ 203 void 204 ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans) 205 { 206 if (nchans > 0) 207 sort_channels(chans, nchans, sizeof(struct ieee80211_channel)); 208 } 209 210 /* 211 * Allocate and construct a Country Information IE. 212 */ 213 struct ieee80211_appie * 214 ieee80211_alloc_countryie(struct ieee80211com *ic) 215 { 216 #define CHAN_UNINTERESTING \ 217 (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \ 218 IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER) 219 /* XXX what about auto? */ 220 /* flag set of channels to be excluded (band added below) */ 221 static const int skipflags[IEEE80211_MODE_MAX] = { 222 [IEEE80211_MODE_AUTO] = CHAN_UNINTERESTING, 223 [IEEE80211_MODE_11A] = CHAN_UNINTERESTING, 224 [IEEE80211_MODE_11B] = CHAN_UNINTERESTING, 225 [IEEE80211_MODE_11G] = CHAN_UNINTERESTING, 226 [IEEE80211_MODE_FH] = CHAN_UNINTERESTING 227 | IEEE80211_CHAN_OFDM 228 | IEEE80211_CHAN_CCK 229 | IEEE80211_CHAN_DYN, 230 [IEEE80211_MODE_TURBO_A] = CHAN_UNINTERESTING, 231 [IEEE80211_MODE_TURBO_G] = CHAN_UNINTERESTING, 232 [IEEE80211_MODE_STURBO_A] = CHAN_UNINTERESTING, 233 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_TURBO 234 | IEEE80211_CHAN_STURBO, 235 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_TURBO 236 | IEEE80211_CHAN_STURBO, 237 [IEEE80211_MODE_11NA] = CHAN_UNINTERESTING, 238 [IEEE80211_MODE_11NG] = CHAN_UNINTERESTING, 239 }; 240 const struct ieee80211_regdomain *rd = &ic->ic_regdomain; 241 uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm; 242 struct ieee80211_appie *aie; 243 struct ieee80211_country_ie *ie; 244 int i, skip, nruns; 245 246 aie = IEEE80211_MALLOC(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE, 247 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 248 if (aie == NULL) { 249 ic_printf(ic, "%s: unable to allocate memory for country ie\n", 250 __func__); 251 /* XXX stat */ 252 return NULL; 253 } 254 ie = (struct ieee80211_country_ie *) aie->ie_data; 255 ie->ie = IEEE80211_ELEMID_COUNTRY; 256 if (rd->isocc[0] == '\0') { 257 ic_printf(ic, "no ISO country string for cc %d; using blanks\n", 258 rd->country); 259 ie->cc[0] = ie->cc[1] = ' '; 260 } else { 261 ie->cc[0] = rd->isocc[0]; 262 ie->cc[1] = rd->isocc[1]; 263 } 264 /* 265 * Indoor/Outdoor portion of country string: 266 * 'I' indoor only 267 * 'O' outdoor only 268 * ' ' all environments 269 */ 270 ie->cc[2] = (rd->location == 'I' ? 'I' : 271 rd->location == 'O' ? 'O' : ' '); 272 /* 273 * Run-length encoded channel+max tx power info. 274 */ 275 frm = (uint8_t *)&ie->band[0]; 276 nextchan = 0; /* NB: impossible channel # */ 277 nruns = 0; 278 memset(chans, 0, sizeof(chans)); 279 skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)]; 280 if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan)) 281 skip |= IEEE80211_CHAN_2GHZ; 282 else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan)) 283 skip |= IEEE80211_CHAN_5GHZ; 284 for (i = 0; i < ic->ic_nchans; i++) { 285 const struct ieee80211_channel *c = &ic->ic_channels[i]; 286 287 if (isset(chans, c->ic_ieee)) /* suppress dup's */ 288 continue; 289 if (c->ic_flags & skip) /* skip band, etc. */ 290 continue; 291 setbit(chans, c->ic_ieee); 292 if (c->ic_ieee != nextchan || 293 c->ic_maxregpower != frm[-1]) { /* new run */ 294 if (nruns == IEEE80211_COUNTRY_MAX_BANDS) { 295 ic_printf(ic, "%s: country ie too big, " 296 "runs > max %d, truncating\n", 297 __func__, IEEE80211_COUNTRY_MAX_BANDS); 298 /* XXX stat? fail? */ 299 break; 300 } 301 frm[0] = c->ic_ieee; /* starting channel # */ 302 frm[1] = 1; /* # channels in run */ 303 frm[2] = c->ic_maxregpower; /* tx power cap */ 304 frm += 3; 305 nextchan = c->ic_ieee + 1; /* overflow? */ 306 nruns++; 307 } else { /* extend run */ 308 frm[-2]++; 309 nextchan++; 310 } 311 } 312 ie->len = frm - ie->cc; 313 if (ie->len & 1) { /* Zero pad to multiple of 2 */ 314 ie->len++; 315 *frm++ = 0; 316 } 317 aie->ie_len = frm - aie->ie_data; 318 319 return aie; 320 #undef CHAN_UNINTERESTING 321 } 322 323 static int 324 allvapsdown(struct ieee80211com *ic) 325 { 326 struct ieee80211vap *vap; 327 328 IEEE80211_LOCK_ASSERT(ic); 329 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) 330 if (vap->iv_state != IEEE80211_S_INIT) 331 return 0; 332 return 1; 333 } 334 335 int 336 ieee80211_setregdomain(struct ieee80211vap *vap, 337 struct ieee80211_regdomain_req *reg) 338 { 339 struct ieee80211com *ic = vap->iv_ic; 340 struct ieee80211_channel *c; 341 int desfreq = 0, desflags = 0; /* XXX silence gcc complaint */ 342 int error, i; 343 344 if (reg->rd.location != 'I' && reg->rd.location != 'O' && 345 reg->rd.location != ' ') { 346 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 347 "%s: invalid location 0x%x\n", __func__, reg->rd.location); 348 return EINVAL; 349 } 350 if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') { 351 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 352 "%s: invalid iso cc 0x%x:0x%x\n", __func__, 353 reg->rd.isocc[0], reg->rd.isocc[1]); 354 return EINVAL; 355 } 356 if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) { 357 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 358 "%s: too many channels %u, max %u\n", __func__, 359 reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX); 360 return EINVAL; 361 } 362 /* 363 * Calculate freq<->IEEE mapping and default max tx power 364 * for channels not setup. The driver can override these 365 * setting to reflect device properties/requirements. 366 */ 367 for (i = 0; i < reg->chaninfo.ic_nchans; i++) { 368 c = ®->chaninfo.ic_chans[i]; 369 if (c->ic_freq == 0 || c->ic_flags == 0) { 370 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 371 "%s: invalid channel spec at [%u]\n", __func__, i); 372 return EINVAL; 373 } 374 if (c->ic_maxregpower == 0) { 375 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 376 "%s: invalid channel spec, zero maxregpower, " 377 "freq %u flags 0x%x\n", __func__, 378 c->ic_freq, c->ic_flags); 379 return EINVAL; 380 } 381 if (c->ic_ieee == 0) 382 c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags); 383 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0) 384 c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq + 385 (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20), 386 c->ic_flags); 387 if (c->ic_maxpower == 0) 388 c->ic_maxpower = 2*c->ic_maxregpower; 389 } 390 IEEE80211_LOCK(ic); 391 /* XXX bandaid; a running vap will likely crash */ 392 if (!allvapsdown(ic)) { 393 IEEE80211_UNLOCK(ic); 394 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 395 "%s: reject: vaps are running\n", __func__); 396 return EBUSY; 397 } 398 error = ic->ic_setregdomain(ic, ®->rd, 399 reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans); 400 if (error != 0) { 401 IEEE80211_UNLOCK(ic); 402 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 403 "%s: driver rejected request, error %u\n", __func__, error); 404 return error; 405 } 406 /* 407 * Commit: copy in new channel table and reset media state. 408 * On return the state machines will be clocked so all vaps 409 * will reset their state. 410 * 411 * XXX ic_bsschan is marked undefined, must have vap's in 412 * INIT state or we blow up forcing stations off 413 */ 414 /* 415 * Save any desired channel for restore below. Note this 416 * needs to be done for all vaps but for now we only do 417 * the one where the ioctl is issued. 418 */ 419 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) { 420 desfreq = vap->iv_des_chan->ic_freq; 421 desflags = vap->iv_des_chan->ic_flags; 422 } 423 /* regdomain parameters */ 424 memcpy(&ic->ic_regdomain, ®->rd, sizeof(reg->rd)); 425 /* channel table */ 426 memcpy(ic->ic_channels, reg->chaninfo.ic_chans, 427 reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel)); 428 ic->ic_nchans = reg->chaninfo.ic_nchans; 429 memset(&ic->ic_channels[ic->ic_nchans], 0, 430 (IEEE80211_CHAN_MAX - ic->ic_nchans) * 431 sizeof(struct ieee80211_channel)); 432 ieee80211_chan_init(ic); 433 434 /* 435 * Invalidate channel-related state. 436 */ 437 if (ic->ic_countryie != NULL) { 438 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 439 ic->ic_countryie = NULL; 440 } 441 ieee80211_scan_flush(vap); 442 ieee80211_dfs_reset(ic); 443 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) { 444 c = ieee80211_find_channel(ic, desfreq, desflags); 445 /* NB: may be NULL if not present in new channel list */ 446 vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC; 447 } 448 IEEE80211_UNLOCK(ic); 449 450 return 0; 451 }
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