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 * Copyright (c) 2005-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD: releng/11.2/sys/net80211/ieee80211_regdomain.c 300738 2016-05-26 13:14:08Z avos $"); 28 29 /* 30 * IEEE 802.11 regdomain support. 31 */ 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/socket.h> 39 40 #include <net/if.h> 41 #include <net/if_var.h> 42 #include <net/if_media.h> 43 #include <net/ethernet.h> 44 45 #include <net80211/ieee80211_var.h> 46 #include <net80211/ieee80211_regdomain.h> 47 48 static void 49 null_getradiocaps(struct ieee80211com *ic, int maxchan, 50 int *n, struct ieee80211_channel *c) 51 { 52 /* just feed back the current channel list */ 53 if (maxchan > ic->ic_nchans) 54 maxchan = ic->ic_nchans; 55 memcpy(c, ic->ic_channels, maxchan*sizeof(struct ieee80211_channel)); 56 *n = maxchan; 57 } 58 59 static int 60 null_setregdomain(struct ieee80211com *ic, 61 struct ieee80211_regdomain *rd, 62 int nchans, struct ieee80211_channel chans[]) 63 { 64 return 0; /* accept anything */ 65 } 66 67 void 68 ieee80211_regdomain_attach(struct ieee80211com *ic) 69 { 70 if (ic->ic_regdomain.regdomain == 0 && 71 ic->ic_regdomain.country == CTRY_DEFAULT) { 72 ic->ic_regdomain.location = ' '; /* both */ 73 /* NB: driver calls ieee80211_init_channels or similar */ 74 } 75 ic->ic_getradiocaps = null_getradiocaps; 76 ic->ic_setregdomain = null_setregdomain; 77 } 78 79 void 80 ieee80211_regdomain_detach(struct ieee80211com *ic) 81 { 82 if (ic->ic_countryie != NULL) { 83 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 84 ic->ic_countryie = NULL; 85 } 86 } 87 88 void 89 ieee80211_regdomain_vattach(struct ieee80211vap *vap) 90 { 91 } 92 93 void 94 ieee80211_regdomain_vdetach(struct ieee80211vap *vap) 95 { 96 } 97 98 static const uint8_t def_chan_2ghz[] = 99 { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 }; 100 static const uint8_t def_chan_5ghz_band1[] = 101 { 36, 40, 44, 48, 52, 56, 60, 64 }; 102 static const uint8_t def_chan_5ghz_band2[] = 103 { 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 }; 104 static const uint8_t def_chan_5ghz_band3[] = 105 { 149, 153, 157, 161 }; 106 107 /* 108 * Setup the channel list for the specified regulatory domain, 109 * country code, and operating modes. This interface is used 110 * when a driver does not obtain the channel list from another 111 * source (such as firmware). 112 */ 113 int 114 ieee80211_init_channels(struct ieee80211com *ic, 115 const struct ieee80211_regdomain *rd, const uint8_t bands[]) 116 { 117 struct ieee80211_channel *chans = ic->ic_channels; 118 int *nchans = &ic->ic_nchans; 119 int ht40; 120 121 /* XXX just do something for now */ 122 ht40 = !!(ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40); 123 *nchans = 0; 124 if (isset(bands, IEEE80211_MODE_11B) || 125 isset(bands, IEEE80211_MODE_11G) || 126 isset(bands, IEEE80211_MODE_11NG)) { 127 int nchan = nitems(def_chan_2ghz); 128 if (!(rd != NULL && rd->ecm)) 129 nchan -= 3; 130 131 ieee80211_add_channel_list_2ghz(chans, IEEE80211_CHAN_MAX, 132 nchans, def_chan_2ghz, nchan, bands, ht40); 133 } 134 if (isset(bands, IEEE80211_MODE_11A) || 135 isset(bands, IEEE80211_MODE_11NA)) { 136 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX, 137 nchans, def_chan_5ghz_band1, nitems(def_chan_5ghz_band1), 138 bands, ht40); 139 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX, 140 nchans, def_chan_5ghz_band2, nitems(def_chan_5ghz_band2), 141 bands, ht40); 142 ieee80211_add_channel_list_5ghz(chans, IEEE80211_CHAN_MAX, 143 nchans, def_chan_5ghz_band3, nitems(def_chan_5ghz_band3), 144 bands, ht40); 145 } 146 if (rd != NULL) 147 ic->ic_regdomain = *rd; 148 149 return 0; 150 } 151 152 static __inline int 153 chancompar(const void *a, const void *b) 154 { 155 const struct ieee80211_channel *ca = a; 156 const struct ieee80211_channel *cb = b; 157 158 return (ca->ic_freq == cb->ic_freq) ? 159 (ca->ic_flags & IEEE80211_CHAN_ALL) - 160 (cb->ic_flags & IEEE80211_CHAN_ALL) : 161 ca->ic_freq - cb->ic_freq; 162 } 163 164 /* 165 * Insertion sort. 166 */ 167 #define swap(_a, _b, _size) { \ 168 uint8_t *s = _b; \ 169 int i = _size; \ 170 do { \ 171 uint8_t tmp = *_a; \ 172 *_a++ = *s; \ 173 *s++ = tmp; \ 174 } while (--i); \ 175 _a -= _size; \ 176 } 177 178 static void 179 sort_channels(void *a, size_t n, size_t size) 180 { 181 uint8_t *aa = a; 182 uint8_t *ai, *t; 183 184 KASSERT(n > 0, ("no channels")); 185 for (ai = aa+size; --n >= 1; ai += size) 186 for (t = ai; t > aa; t -= size) { 187 uint8_t *u = t - size; 188 if (chancompar(u, t) <= 0) 189 break; 190 swap(u, t, size); 191 } 192 } 193 #undef swap 194 195 /* 196 * Order channels w/ the same frequency so that 197 * b < g < htg and a < hta. This is used to optimize 198 * channel table lookups and some user applications 199 * may also depend on it (though they should not). 200 */ 201 void 202 ieee80211_sort_channels(struct ieee80211_channel chans[], int nchans) 203 { 204 if (nchans > 0) 205 sort_channels(chans, nchans, sizeof(struct ieee80211_channel)); 206 } 207 208 /* 209 * Allocate and construct a Country Information IE. 210 */ 211 struct ieee80211_appie * 212 ieee80211_alloc_countryie(struct ieee80211com *ic) 213 { 214 #define CHAN_UNINTERESTING \ 215 (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO | \ 216 IEEE80211_CHAN_HALF | IEEE80211_CHAN_QUARTER) 217 /* XXX what about auto? */ 218 /* flag set of channels to be excluded (band added below) */ 219 static const int skipflags[IEEE80211_MODE_MAX] = { 220 [IEEE80211_MODE_AUTO] = CHAN_UNINTERESTING, 221 [IEEE80211_MODE_11A] = CHAN_UNINTERESTING, 222 [IEEE80211_MODE_11B] = CHAN_UNINTERESTING, 223 [IEEE80211_MODE_11G] = CHAN_UNINTERESTING, 224 [IEEE80211_MODE_FH] = CHAN_UNINTERESTING 225 | IEEE80211_CHAN_OFDM 226 | IEEE80211_CHAN_CCK 227 | IEEE80211_CHAN_DYN, 228 [IEEE80211_MODE_TURBO_A] = CHAN_UNINTERESTING, 229 [IEEE80211_MODE_TURBO_G] = CHAN_UNINTERESTING, 230 [IEEE80211_MODE_STURBO_A] = CHAN_UNINTERESTING, 231 [IEEE80211_MODE_HALF] = IEEE80211_CHAN_TURBO 232 | IEEE80211_CHAN_STURBO, 233 [IEEE80211_MODE_QUARTER] = IEEE80211_CHAN_TURBO 234 | IEEE80211_CHAN_STURBO, 235 [IEEE80211_MODE_11NA] = CHAN_UNINTERESTING, 236 [IEEE80211_MODE_11NG] = CHAN_UNINTERESTING, 237 }; 238 const struct ieee80211_regdomain *rd = &ic->ic_regdomain; 239 uint8_t nextchan, chans[IEEE80211_CHAN_BYTES], *frm; 240 struct ieee80211_appie *aie; 241 struct ieee80211_country_ie *ie; 242 int i, skip, nruns; 243 244 aie = IEEE80211_MALLOC(IEEE80211_COUNTRY_MAX_SIZE, M_80211_NODE_IE, 245 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); 246 if (aie == NULL) { 247 ic_printf(ic, "%s: unable to allocate memory for country ie\n", 248 __func__); 249 /* XXX stat */ 250 return NULL; 251 } 252 ie = (struct ieee80211_country_ie *) aie->ie_data; 253 ie->ie = IEEE80211_ELEMID_COUNTRY; 254 if (rd->isocc[0] == '\0') { 255 ic_printf(ic, "no ISO country string for cc %d; using blanks\n", 256 rd->country); 257 ie->cc[0] = ie->cc[1] = ' '; 258 } else { 259 ie->cc[0] = rd->isocc[0]; 260 ie->cc[1] = rd->isocc[1]; 261 } 262 /* 263 * Indoor/Outdoor portion of country string: 264 * 'I' indoor only 265 * 'O' outdoor only 266 * ' ' all environments 267 */ 268 ie->cc[2] = (rd->location == 'I' ? 'I' : 269 rd->location == 'O' ? 'O' : ' '); 270 /* 271 * Run-length encoded channel+max tx power info. 272 */ 273 frm = (uint8_t *)&ie->band[0]; 274 nextchan = 0; /* NB: impossible channel # */ 275 nruns = 0; 276 memset(chans, 0, sizeof(chans)); 277 skip = skipflags[ieee80211_chan2mode(ic->ic_bsschan)]; 278 if (IEEE80211_IS_CHAN_5GHZ(ic->ic_bsschan)) 279 skip |= IEEE80211_CHAN_2GHZ; 280 else if (IEEE80211_IS_CHAN_2GHZ(ic->ic_bsschan)) 281 skip |= IEEE80211_CHAN_5GHZ; 282 for (i = 0; i < ic->ic_nchans; i++) { 283 const struct ieee80211_channel *c = &ic->ic_channels[i]; 284 285 if (isset(chans, c->ic_ieee)) /* suppress dup's */ 286 continue; 287 if (c->ic_flags & skip) /* skip band, etc. */ 288 continue; 289 setbit(chans, c->ic_ieee); 290 if (c->ic_ieee != nextchan || 291 c->ic_maxregpower != frm[-1]) { /* new run */ 292 if (nruns == IEEE80211_COUNTRY_MAX_BANDS) { 293 ic_printf(ic, "%s: country ie too big, " 294 "runs > max %d, truncating\n", 295 __func__, IEEE80211_COUNTRY_MAX_BANDS); 296 /* XXX stat? fail? */ 297 break; 298 } 299 frm[0] = c->ic_ieee; /* starting channel # */ 300 frm[1] = 1; /* # channels in run */ 301 frm[2] = c->ic_maxregpower; /* tx power cap */ 302 frm += 3; 303 nextchan = c->ic_ieee + 1; /* overflow? */ 304 nruns++; 305 } else { /* extend run */ 306 frm[-2]++; 307 nextchan++; 308 } 309 } 310 ie->len = frm - ie->cc; 311 if (ie->len & 1) { /* Zero pad to multiple of 2 */ 312 ie->len++; 313 *frm++ = 0; 314 } 315 aie->ie_len = frm - aie->ie_data; 316 317 return aie; 318 #undef CHAN_UNINTERESTING 319 } 320 321 static int 322 allvapsdown(struct ieee80211com *ic) 323 { 324 struct ieee80211vap *vap; 325 326 IEEE80211_LOCK_ASSERT(ic); 327 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) 328 if (vap->iv_state != IEEE80211_S_INIT) 329 return 0; 330 return 1; 331 } 332 333 int 334 ieee80211_setregdomain(struct ieee80211vap *vap, 335 struct ieee80211_regdomain_req *reg) 336 { 337 struct ieee80211com *ic = vap->iv_ic; 338 struct ieee80211_channel *c; 339 int desfreq = 0, desflags = 0; /* XXX silence gcc complaint */ 340 int error, i; 341 342 if (reg->rd.location != 'I' && reg->rd.location != 'O' && 343 reg->rd.location != ' ') { 344 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 345 "%s: invalid location 0x%x\n", __func__, reg->rd.location); 346 return EINVAL; 347 } 348 if (reg->rd.isocc[0] == '\0' || reg->rd.isocc[1] == '\0') { 349 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 350 "%s: invalid iso cc 0x%x:0x%x\n", __func__, 351 reg->rd.isocc[0], reg->rd.isocc[1]); 352 return EINVAL; 353 } 354 if (reg->chaninfo.ic_nchans > IEEE80211_CHAN_MAX) { 355 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 356 "%s: too many channels %u, max %u\n", __func__, 357 reg->chaninfo.ic_nchans, IEEE80211_CHAN_MAX); 358 return EINVAL; 359 } 360 /* 361 * Calculate freq<->IEEE mapping and default max tx power 362 * for channels not setup. The driver can override these 363 * setting to reflect device properties/requirements. 364 */ 365 for (i = 0; i < reg->chaninfo.ic_nchans; i++) { 366 c = ®->chaninfo.ic_chans[i]; 367 if (c->ic_freq == 0 || c->ic_flags == 0) { 368 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 369 "%s: invalid channel spec at [%u]\n", __func__, i); 370 return EINVAL; 371 } 372 if (c->ic_maxregpower == 0) { 373 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 374 "%s: invalid channel spec, zero maxregpower, " 375 "freq %u flags 0x%x\n", __func__, 376 c->ic_freq, c->ic_flags); 377 return EINVAL; 378 } 379 if (c->ic_ieee == 0) 380 c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags); 381 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0) 382 c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq + 383 (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20), 384 c->ic_flags); 385 if (c->ic_maxpower == 0) 386 c->ic_maxpower = 2*c->ic_maxregpower; 387 } 388 IEEE80211_LOCK(ic); 389 /* XXX bandaid; a running vap will likely crash */ 390 if (!allvapsdown(ic)) { 391 IEEE80211_UNLOCK(ic); 392 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 393 "%s: reject: vaps are running\n", __func__); 394 return EBUSY; 395 } 396 error = ic->ic_setregdomain(ic, ®->rd, 397 reg->chaninfo.ic_nchans, reg->chaninfo.ic_chans); 398 if (error != 0) { 399 IEEE80211_UNLOCK(ic); 400 IEEE80211_DPRINTF(vap, IEEE80211_MSG_IOCTL, 401 "%s: driver rejected request, error %u\n", __func__, error); 402 return error; 403 } 404 /* 405 * Commit: copy in new channel table and reset media state. 406 * On return the state machines will be clocked so all vaps 407 * will reset their state. 408 * 409 * XXX ic_bsschan is marked undefined, must have vap's in 410 * INIT state or we blow up forcing stations off 411 */ 412 /* 413 * Save any desired channel for restore below. Note this 414 * needs to be done for all vaps but for now we only do 415 * the one where the ioctl is issued. 416 */ 417 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) { 418 desfreq = vap->iv_des_chan->ic_freq; 419 desflags = vap->iv_des_chan->ic_flags; 420 } 421 /* regdomain parameters */ 422 memcpy(&ic->ic_regdomain, ®->rd, sizeof(reg->rd)); 423 /* channel table */ 424 memcpy(ic->ic_channels, reg->chaninfo.ic_chans, 425 reg->chaninfo.ic_nchans * sizeof(struct ieee80211_channel)); 426 ic->ic_nchans = reg->chaninfo.ic_nchans; 427 memset(&ic->ic_channels[ic->ic_nchans], 0, 428 (IEEE80211_CHAN_MAX - ic->ic_nchans) * 429 sizeof(struct ieee80211_channel)); 430 ieee80211_chan_init(ic); 431 432 /* 433 * Invalidate channel-related state. 434 */ 435 if (ic->ic_countryie != NULL) { 436 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 437 ic->ic_countryie = NULL; 438 } 439 ieee80211_scan_flush(vap); 440 ieee80211_dfs_reset(ic); 441 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC) { 442 c = ieee80211_find_channel(ic, desfreq, desflags); 443 /* NB: may be NULL if not present in new channel list */ 444 vap->iv_des_chan = (c != NULL) ? c : IEEE80211_CHAN_ANYC; 445 } 446 IEEE80211_UNLOCK(ic); 447 448 return 0; 449 }
Cache object: 8a1ba7fe9271565d6864569b26d03476
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