ieee80211.c revision 153350
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2005 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: head/sys/net80211/ieee80211.c 153350 2005-12-12 18:38:20Z sam $"); 35 36/* 37 * IEEE 802.11 generic handler 38 */ 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/kernel.h> 43 44#include <sys/socket.h> 45 46#include <net/if.h> 47#include <net/if_media.h> 48#include <net/ethernet.h> 49 50#include <net80211/ieee80211_var.h> 51 52#include <net/bpf.h> 53 54const char *ieee80211_phymode_name[] = { 55 "auto", /* IEEE80211_MODE_AUTO */ 56 "11a", /* IEEE80211_MODE_11A */ 57 "11b", /* IEEE80211_MODE_11B */ 58 "11g", /* IEEE80211_MODE_11G */ 59 "FH", /* IEEE80211_MODE_FH */ 60 "turboA", /* IEEE80211_MODE_TURBO_A */ 61 "turboG", /* IEEE80211_MODE_TURBO_G */ 62}; 63 64/* list of all instances */ 65SLIST_HEAD(ieee80211_list, ieee80211com); 66static struct ieee80211_list ieee80211_list = 67 SLIST_HEAD_INITIALIZER(ieee80211_list); 68static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 69static struct mtx ieee80211_vap_mtx; 70MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF); 71 72static void 73ieee80211_add_vap(struct ieee80211com *ic) 74{ 75#define N(a) (sizeof(a)/sizeof(a[0])) 76 int i; 77 u_int8_t b; 78 79 mtx_lock(&ieee80211_vap_mtx); 80 ic->ic_vap = 0; 81 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 82 ic->ic_vap += NBBY; 83 if (i == N(ieee80211_vapmap)) 84 panic("vap table full"); 85 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 86 ic->ic_vap++; 87 setbit(ieee80211_vapmap, ic->ic_vap); 88 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 89 mtx_unlock(&ieee80211_vap_mtx); 90#undef N 91} 92 93static void 94ieee80211_remove_vap(struct ieee80211com *ic) 95{ 96 mtx_lock(&ieee80211_vap_mtx); 97 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 98 KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 99 ("invalid vap id %d", ic->ic_vap)); 100 KASSERT(isset(ieee80211_vapmap, ic->ic_vap), 101 ("vap id %d not allocated", ic->ic_vap)); 102 clrbit(ieee80211_vapmap, ic->ic_vap); 103 mtx_unlock(&ieee80211_vap_mtx); 104} 105 106/* 107 * Default reset method for use with the ioctl support. This 108 * method is invoked after any state change in the 802.11 109 * layer that should be propagated to the hardware but not 110 * require re-initialization of the 802.11 state machine (e.g 111 * rescanning for an ap). We always return ENETRESET which 112 * should cause the driver to re-initialize the device. Drivers 113 * can override this method to implement more optimized support. 114 */ 115static int 116ieee80211_default_reset(struct ifnet *ifp) 117{ 118 return ENETRESET; 119} 120 121void 122ieee80211_ifattach(struct ieee80211com *ic) 123{ 124 struct ifnet *ifp = ic->ic_ifp; 125 struct ieee80211_channel *c; 126 int i; 127 128 ether_ifattach(ifp, ic->ic_myaddr); 129 bpfattach2(ifp, DLT_IEEE802_11, 130 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 131 132 ieee80211_crypto_attach(ic); 133 134 /* 135 * Fill in 802.11 available channel set, mark 136 * all available channels as active, and pick 137 * a default channel if not already specified. 138 */ 139 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 140 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 141 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 142 c = &ic->ic_channels[i]; 143 if (c->ic_flags) { 144 /* 145 * Verify driver passed us valid data. 146 */ 147 if (i != ieee80211_chan2ieee(ic, c)) { 148 if_printf(ifp, "bad channel ignored; " 149 "freq %u flags %x number %u\n", 150 c->ic_freq, c->ic_flags, i); 151 c->ic_flags = 0; /* NB: remove */ 152 continue; 153 } 154 setbit(ic->ic_chan_avail, i); 155 /* 156 * Identify mode capabilities. 157 */ 158 if (IEEE80211_IS_CHAN_A(c)) 159 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 160 if (IEEE80211_IS_CHAN_B(c)) 161 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 162 if (IEEE80211_IS_CHAN_PUREG(c)) 163 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 164 if (IEEE80211_IS_CHAN_FHSS(c)) 165 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 166 if (IEEE80211_IS_CHAN_T(c)) 167 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 168 if (IEEE80211_IS_CHAN_108G(c)) 169 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 170 if (ic->ic_curchan == NULL) { 171 /* arbitrarily pick the first channel */ 172 ic->ic_curchan = &ic->ic_channels[i]; 173 } 174 } 175 } 176 /* validate ic->ic_curmode */ 177 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 178 ic->ic_curmode = IEEE80211_MODE_AUTO; 179 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 180#if 0 181 /* 182 * Enable WME by default if we're capable. 183 */ 184 if (ic->ic_caps & IEEE80211_C_WME) 185 ic->ic_flags |= IEEE80211_F_WME; 186#endif 187 (void) ieee80211_setmode(ic, ic->ic_curmode); 188 189 if (ic->ic_bintval == 0) 190 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 191 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 192 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 193 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 194 195 if (ic->ic_lintval == 0) 196 ic->ic_lintval = ic->ic_bintval; 197 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 198 199 ieee80211_node_attach(ic); 200 ieee80211_proto_attach(ic); 201 202 ieee80211_add_vap(ic); 203 204 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 205 206 /* 207 * Install a default reset method for the ioctl support. 208 * The driver is expected to fill this in before calling us. 209 */ 210 if (ic->ic_reset == NULL) 211 ic->ic_reset = ieee80211_default_reset; 212} 213 214void 215ieee80211_ifdetach(struct ieee80211com *ic) 216{ 217 struct ifnet *ifp = ic->ic_ifp; 218 219 ieee80211_remove_vap(ic); 220 221 ieee80211_sysctl_detach(ic); 222 ieee80211_proto_detach(ic); 223 ieee80211_crypto_detach(ic); 224 ieee80211_node_detach(ic); 225 ifmedia_removeall(&ic->ic_media); 226 227 IEEE80211_BEACON_LOCK_DESTROY(ic); 228 229 bpfdetach(ifp); 230 ether_ifdetach(ifp); 231} 232 233/* 234 * Convert MHz frequency to IEEE channel number. 235 */ 236int 237ieee80211_mhz2ieee(u_int freq, u_int flags) 238{ 239#define IS_CHAN_IN_PUBLIC_SAFETY_BAND(_c) ((_c) > 4940 && (_c) < 4990) 240 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 241 if (freq == 2484) 242 return 14; 243 if (freq < 2484) 244 return ((int) freq - 2407) / 5; 245 else 246 return 15 + ((freq - 2512) / 20); 247 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 248 if (IS_CHAN_IN_PUBLIC_SAFETY_BAND(freq)) 249 return ((freq * 10) + 250 (((freq % 5) == 2) ? 5 : 0) - 49400) / 5; 251 if (freq <= 5000) 252 return (freq - 4000) / 5; 253 else 254 return (freq - 5000) / 5; 255 } else { /* either, guess */ 256 if (freq == 2484) 257 return 14; 258 if (freq < 2484) 259 return ((int) freq - 2407) / 5; 260 if (freq < 5000) { 261 if (IS_CHAN_IN_PUBLIC_SAFETY_BAND(freq)) 262 return ((freq * 10) + 263 (((freq % 5) == 2) ? 5 : 0) - 49400)/5; 264 else if (freq > 4900) 265 return (freq - 4000) / 5; 266 else 267 return 15 + ((freq - 2512) / 20); 268 } 269 return (freq - 5000) / 5; 270 } 271#undef IS_CHAN_IN_PUBLIC_SAFETY_BAND 272} 273 274/* 275 * Convert channel to IEEE channel number. 276 */ 277int 278ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 279{ 280 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 281 return c - ic->ic_channels; 282 else if (c == IEEE80211_CHAN_ANYC) 283 return IEEE80211_CHAN_ANY; 284 else if (c != NULL) { 285 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 286 c->ic_freq, c->ic_flags); 287 return 0; /* XXX */ 288 } else { 289 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 290 return 0; /* XXX */ 291 } 292} 293 294/* 295 * Convert IEEE channel number to MHz frequency. 296 */ 297u_int 298ieee80211_ieee2mhz(u_int chan, u_int flags) 299{ 300 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 301 if (chan == 14) 302 return 2484; 303 if (chan < 14) 304 return 2407 + chan*5; 305 else 306 return 2512 + ((chan-15)*20); 307 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 308 return 5000 + (chan*5); 309 } else { /* either, guess */ 310 if (chan == 14) 311 return 2484; 312 if (chan < 14) /* 0-13 */ 313 return 2407 + chan*5; 314 if (chan < 27) /* 15-26 */ 315 return 2512 + ((chan-15)*20); 316 return 5000 + (chan*5); 317 } 318} 319 320/* 321 * Setup the media data structures according to the channel and 322 * rate tables. This must be called by the driver after 323 * ieee80211_attach and before most anything else. 324 */ 325void 326ieee80211_media_init(struct ieee80211com *ic, 327 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 328{ 329#define ADD(_ic, _s, _o) \ 330 ifmedia_add(&(_ic)->ic_media, \ 331 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 332 struct ifnet *ifp = ic->ic_ifp; 333 struct ifmediareq imr; 334 int i, j, mode, rate, maxrate, mword, mopt, r; 335 struct ieee80211_rateset *rs; 336 struct ieee80211_rateset allrates; 337 338 /* 339 * Do late attach work that must wait for any subclass 340 * (i.e. driver) work such as overriding methods. 341 */ 342 ieee80211_node_lateattach(ic); 343 344 /* 345 * Fill in media characteristics. 346 */ 347 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 348 maxrate = 0; 349 memset(&allrates, 0, sizeof(allrates)); 350 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 351 static const u_int mopts[] = { 352 IFM_AUTO, 353 IFM_IEEE80211_11A, 354 IFM_IEEE80211_11B, 355 IFM_IEEE80211_11G, 356 IFM_IEEE80211_FH, 357 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 358 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 359 }; 360 if ((ic->ic_modecaps & (1<<mode)) == 0) 361 continue; 362 mopt = mopts[mode]; 363 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 364 if (ic->ic_caps & IEEE80211_C_IBSS) 365 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 366 if (ic->ic_caps & IEEE80211_C_HOSTAP) 367 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 368 if (ic->ic_caps & IEEE80211_C_AHDEMO) 369 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 370 if (ic->ic_caps & IEEE80211_C_MONITOR) 371 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 372 if (mode == IEEE80211_MODE_AUTO) 373 continue; 374 rs = &ic->ic_sup_rates[mode]; 375 for (i = 0; i < rs->rs_nrates; i++) { 376 rate = rs->rs_rates[i]; 377 mword = ieee80211_rate2media(ic, rate, mode); 378 if (mword == 0) 379 continue; 380 ADD(ic, mword, mopt); 381 if (ic->ic_caps & IEEE80211_C_IBSS) 382 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 383 if (ic->ic_caps & IEEE80211_C_HOSTAP) 384 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 385 if (ic->ic_caps & IEEE80211_C_AHDEMO) 386 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 387 if (ic->ic_caps & IEEE80211_C_MONITOR) 388 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 389 /* 390 * Add rate to the collection of all rates. 391 */ 392 r = rate & IEEE80211_RATE_VAL; 393 for (j = 0; j < allrates.rs_nrates; j++) 394 if (allrates.rs_rates[j] == r) 395 break; 396 if (j == allrates.rs_nrates) { 397 /* unique, add to the set */ 398 allrates.rs_rates[j] = r; 399 allrates.rs_nrates++; 400 } 401 rate = (rate & IEEE80211_RATE_VAL) / 2; 402 if (rate > maxrate) 403 maxrate = rate; 404 } 405 } 406 for (i = 0; i < allrates.rs_nrates; i++) { 407 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 408 IEEE80211_MODE_AUTO); 409 if (mword == 0) 410 continue; 411 mword = IFM_SUBTYPE(mword); /* remove media options */ 412 ADD(ic, mword, 0); 413 if (ic->ic_caps & IEEE80211_C_IBSS) 414 ADD(ic, mword, IFM_IEEE80211_ADHOC); 415 if (ic->ic_caps & IEEE80211_C_HOSTAP) 416 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 417 if (ic->ic_caps & IEEE80211_C_AHDEMO) 418 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 419 if (ic->ic_caps & IEEE80211_C_MONITOR) 420 ADD(ic, mword, IFM_IEEE80211_MONITOR); 421 } 422 ieee80211_media_status(ifp, &imr); 423 ifmedia_set(&ic->ic_media, imr.ifm_active); 424 425 if (maxrate) 426 ifp->if_baudrate = IF_Mbps(maxrate); 427#undef ADD 428} 429 430void 431ieee80211_announce(struct ieee80211com *ic) 432{ 433 struct ifnet *ifp = ic->ic_ifp; 434 int i, mode, rate, mword; 435 struct ieee80211_rateset *rs; 436 437 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 438 if ((ic->ic_modecaps & (1<<mode)) == 0) 439 continue; 440 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 441 rs = &ic->ic_sup_rates[mode]; 442 for (i = 0; i < rs->rs_nrates; i++) { 443 rate = rs->rs_rates[i]; 444 mword = ieee80211_rate2media(ic, rate, mode); 445 if (mword == 0) 446 continue; 447 printf("%s%d%sMbps", (i != 0 ? " " : ""), 448 (rate & IEEE80211_RATE_VAL) / 2, 449 ((rate & 0x1) != 0 ? ".5" : "")); 450 } 451 printf("\n"); 452 } 453} 454 455static int 456findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 457{ 458#define IEEERATE(_ic,_m,_i) \ 459 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 460 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 461 for (i = 0; i < nrates; i++) 462 if (IEEERATE(ic, mode, i) == rate) 463 return i; 464 return -1; 465#undef IEEERATE 466} 467 468/* 469 * Find an instance by it's mac address. 470 */ 471struct ieee80211com * 472ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 473{ 474 struct ieee80211com *ic; 475 476 /* XXX lock */ 477 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 478 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 479 return ic; 480 return NULL; 481} 482 483static struct ieee80211com * 484ieee80211_find_instance(struct ifnet *ifp) 485{ 486 struct ieee80211com *ic; 487 488 /* XXX lock */ 489 /* XXX not right for multiple instances but works for now */ 490 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 491 if (ic->ic_ifp == ifp) 492 return ic; 493 return NULL; 494} 495 496/* 497 * Handle a media change request. 498 */ 499int 500ieee80211_media_change(struct ifnet *ifp) 501{ 502 struct ieee80211com *ic; 503 struct ifmedia_entry *ime; 504 enum ieee80211_opmode newopmode; 505 enum ieee80211_phymode newphymode; 506 int i, j, newrate, error = 0; 507 508 ic = ieee80211_find_instance(ifp); 509 if (!ic) { 510 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 511 return EINVAL; 512 } 513 ime = ic->ic_media.ifm_cur; 514 /* 515 * First, identify the phy mode. 516 */ 517 switch (IFM_MODE(ime->ifm_media)) { 518 case IFM_IEEE80211_11A: 519 newphymode = IEEE80211_MODE_11A; 520 break; 521 case IFM_IEEE80211_11B: 522 newphymode = IEEE80211_MODE_11B; 523 break; 524 case IFM_IEEE80211_11G: 525 newphymode = IEEE80211_MODE_11G; 526 break; 527 case IFM_IEEE80211_FH: 528 newphymode = IEEE80211_MODE_FH; 529 break; 530 case IFM_AUTO: 531 newphymode = IEEE80211_MODE_AUTO; 532 break; 533 default: 534 return EINVAL; 535 } 536 /* 537 * Turbo mode is an ``option''. 538 * XXX does not apply to AUTO 539 */ 540 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 541 if (newphymode == IEEE80211_MODE_11A) 542 newphymode = IEEE80211_MODE_TURBO_A; 543 else if (newphymode == IEEE80211_MODE_11G) 544 newphymode = IEEE80211_MODE_TURBO_G; 545 else 546 return EINVAL; 547 } 548 /* 549 * Validate requested mode is available. 550 */ 551 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 552 return EINVAL; 553 554 /* 555 * Next, the fixed/variable rate. 556 */ 557 i = -1; 558 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 559 /* 560 * Convert media subtype to rate. 561 */ 562 newrate = ieee80211_media2rate(ime->ifm_media); 563 if (newrate == 0) 564 return EINVAL; 565 /* 566 * Check the rate table for the specified/current phy. 567 */ 568 if (newphymode == IEEE80211_MODE_AUTO) { 569 /* 570 * In autoselect mode search for the rate. 571 */ 572 for (j = IEEE80211_MODE_11A; 573 j < IEEE80211_MODE_MAX; j++) { 574 if ((ic->ic_modecaps & (1<<j)) == 0) 575 continue; 576 i = findrate(ic, j, newrate); 577 if (i != -1) { 578 /* lock mode too */ 579 newphymode = j; 580 break; 581 } 582 } 583 } else { 584 i = findrate(ic, newphymode, newrate); 585 } 586 if (i == -1) /* mode/rate mismatch */ 587 return EINVAL; 588 } 589 /* NB: defer rate setting to later */ 590 591 /* 592 * Deduce new operating mode but don't install it just yet. 593 */ 594 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 595 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 596 newopmode = IEEE80211_M_AHDEMO; 597 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 598 newopmode = IEEE80211_M_HOSTAP; 599 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 600 newopmode = IEEE80211_M_IBSS; 601 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 602 newopmode = IEEE80211_M_MONITOR; 603 else 604 newopmode = IEEE80211_M_STA; 605 606 /* 607 * Autoselect doesn't make sense when operating as an AP. 608 * If no phy mode has been selected, pick one and lock it 609 * down so rate tables can be used in forming beacon frames 610 * and the like. 611 */ 612 if (newopmode == IEEE80211_M_HOSTAP && 613 newphymode == IEEE80211_MODE_AUTO) { 614 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 615 if (ic->ic_modecaps & (1<<j)) { 616 newphymode = j; 617 break; 618 } 619 } 620 621 /* 622 * Handle phy mode change. 623 */ 624 if (ic->ic_curmode != newphymode) { /* change phy mode */ 625 error = ieee80211_setmode(ic, newphymode); 626 if (error != 0) 627 return error; 628 error = ENETRESET; 629 } 630 631 /* 632 * Committed to changes, install the rate setting. 633 */ 634 if (ic->ic_fixed_rate != i) { 635 ic->ic_fixed_rate = i; /* set fixed tx rate */ 636 error = ENETRESET; 637 } 638 639 /* 640 * Handle operating mode change. 641 */ 642 if (ic->ic_opmode != newopmode) { 643 ic->ic_opmode = newopmode; 644 switch (newopmode) { 645 case IEEE80211_M_AHDEMO: 646 case IEEE80211_M_HOSTAP: 647 case IEEE80211_M_STA: 648 case IEEE80211_M_MONITOR: 649 ic->ic_flags &= ~IEEE80211_F_IBSSON; 650 break; 651 case IEEE80211_M_IBSS: 652 ic->ic_flags |= IEEE80211_F_IBSSON; 653 break; 654 } 655 /* 656 * Yech, slot time may change depending on the 657 * operating mode so reset it to be sure everything 658 * is setup appropriately. 659 */ 660 ieee80211_reset_erp(ic); 661 ieee80211_wme_initparams(ic); /* after opmode change */ 662 error = ENETRESET; 663 } 664#ifdef notdef 665 if (error == 0) 666 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 667#endif 668 return error; 669} 670 671void 672ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 673{ 674 struct ieee80211com *ic; 675 struct ieee80211_rateset *rs; 676 677 ic = ieee80211_find_instance(ifp); 678 if (!ic) { 679 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 680 return; 681 } 682 imr->ifm_status = IFM_AVALID; 683 imr->ifm_active = IFM_IEEE80211; 684 if (ic->ic_state == IEEE80211_S_RUN) 685 imr->ifm_status |= IFM_ACTIVE; 686 /* 687 * Calculate a current rate if possible. 688 */ 689 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 690 /* 691 * A fixed rate is set, report that. 692 */ 693 rs = &ic->ic_sup_rates[ic->ic_curmode]; 694 imr->ifm_active |= ieee80211_rate2media(ic, 695 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 696 } else if (ic->ic_opmode == IEEE80211_M_STA) { 697 /* 698 * In station mode report the current transmit rate. 699 */ 700 rs = &ic->ic_bss->ni_rates; 701 imr->ifm_active |= ieee80211_rate2media(ic, 702 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 703 } else 704 imr->ifm_active |= IFM_AUTO; 705 switch (ic->ic_opmode) { 706 case IEEE80211_M_STA: 707 break; 708 case IEEE80211_M_IBSS: 709 imr->ifm_active |= IFM_IEEE80211_ADHOC; 710 break; 711 case IEEE80211_M_AHDEMO: 712 /* should not come here */ 713 break; 714 case IEEE80211_M_HOSTAP: 715 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 716 break; 717 case IEEE80211_M_MONITOR: 718 imr->ifm_active |= IFM_IEEE80211_MONITOR; 719 break; 720 } 721 switch (ic->ic_curmode) { 722 case IEEE80211_MODE_11A: 723 imr->ifm_active |= IFM_IEEE80211_11A; 724 break; 725 case IEEE80211_MODE_11B: 726 imr->ifm_active |= IFM_IEEE80211_11B; 727 break; 728 case IEEE80211_MODE_11G: 729 imr->ifm_active |= IFM_IEEE80211_11G; 730 break; 731 case IEEE80211_MODE_FH: 732 imr->ifm_active |= IFM_IEEE80211_FH; 733 break; 734 case IEEE80211_MODE_TURBO_A: 735 imr->ifm_active |= IFM_IEEE80211_11A 736 | IFM_IEEE80211_TURBO; 737 break; 738 case IEEE80211_MODE_TURBO_G: 739 imr->ifm_active |= IFM_IEEE80211_11G 740 | IFM_IEEE80211_TURBO; 741 break; 742 } 743} 744 745void 746ieee80211_watchdog(struct ieee80211com *ic) 747{ 748 struct ieee80211_node_table *nt; 749 int need_inact_timer = 0; 750 751 if (ic->ic_state != IEEE80211_S_INIT) { 752 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 753 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 754 nt = &ic->ic_scan; 755 if (nt->nt_inact_timer) { 756 if (--nt->nt_inact_timer == 0) 757 nt->nt_timeout(nt); 758 need_inact_timer += nt->nt_inact_timer; 759 } 760 nt = &ic->ic_sta; 761 if (nt->nt_inact_timer) { 762 if (--nt->nt_inact_timer == 0) 763 nt->nt_timeout(nt); 764 need_inact_timer += nt->nt_inact_timer; 765 } 766 } 767 if (ic->ic_mgt_timer != 0 || need_inact_timer) 768 ic->ic_ifp->if_timer = 1; 769} 770 771/* 772 * Set the current phy mode and recalculate the active channel 773 * set based on the available channels for this mode. Also 774 * select a new default/current channel if the current one is 775 * inappropriate for this mode. 776 */ 777int 778ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 779{ 780#define N(a) (sizeof(a) / sizeof(a[0])) 781 static const u_int chanflags[] = { 782 0, /* IEEE80211_MODE_AUTO */ 783 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 784 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 785 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 786 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 787 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 788 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 789 }; 790 struct ieee80211_channel *c; 791 u_int modeflags; 792 int i; 793 794 /* validate new mode */ 795 if ((ic->ic_modecaps & (1<<mode)) == 0) { 796 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 797 "%s: mode %u not supported (caps 0x%x)\n", 798 __func__, mode, ic->ic_modecaps); 799 return EINVAL; 800 } 801 802 /* 803 * Verify at least one channel is present in the available 804 * channel list before committing to the new mode. 805 */ 806 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 807 modeflags = chanflags[mode]; 808 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 809 c = &ic->ic_channels[i]; 810 if (c->ic_flags == 0) 811 continue; 812 if (mode == IEEE80211_MODE_AUTO) { 813 /* ignore turbo channels for autoselect */ 814 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 815 break; 816 } else { 817 if ((c->ic_flags & modeflags) == modeflags) 818 break; 819 } 820 } 821 if (i > IEEE80211_CHAN_MAX) { 822 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 823 "%s: no channels found for mode %u\n", __func__, mode); 824 return EINVAL; 825 } 826 827 /* 828 * Calculate the active channel set. 829 */ 830 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 831 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 832 c = &ic->ic_channels[i]; 833 if (c->ic_flags == 0) 834 continue; 835 if (mode == IEEE80211_MODE_AUTO) { 836 /* take anything but pure turbo channels */ 837 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 838 setbit(ic->ic_chan_active, i); 839 } else { 840 if ((c->ic_flags & modeflags) == modeflags) 841 setbit(ic->ic_chan_active, i); 842 } 843 } 844 /* 845 * If no current/default channel is setup or the current 846 * channel is wrong for the mode then pick the first 847 * available channel from the active list. This is likely 848 * not the right one. 849 */ 850 if (ic->ic_ibss_chan == NULL || 851 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 852 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 853 if (isset(ic->ic_chan_active, i)) { 854 ic->ic_ibss_chan = &ic->ic_channels[i]; 855 break; 856 } 857 KASSERT(ic->ic_ibss_chan != NULL && 858 isset(ic->ic_chan_active, 859 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 860 ("Bad IBSS channel %u", 861 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 862 } 863 /* 864 * If the desired channel is set but no longer valid then reset it. 865 */ 866 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 867 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 868 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 869 870 /* 871 * Do mode-specific rate setup. 872 */ 873 if (mode == IEEE80211_MODE_11G) { 874 /* 875 * Use a mixed 11b/11g rate set. 876 */ 877 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 878 IEEE80211_MODE_11G); 879 } else if (mode == IEEE80211_MODE_11B) { 880 /* 881 * Force pure 11b rate set. 882 */ 883 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 884 IEEE80211_MODE_11B); 885 } 886 /* 887 * Setup an initial rate set according to the 888 * current/default channel selected above. This 889 * will be changed when scanning but must exist 890 * now so driver have a consistent state of ic_ibss_chan. 891 */ 892 if (ic->ic_bss) /* NB: can be called before lateattach */ 893 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 894 895 ic->ic_curmode = mode; 896 ieee80211_reset_erp(ic); /* reset ERP state */ 897 ieee80211_wme_initparams(ic); /* reset WME stat */ 898 899 return 0; 900#undef N 901} 902 903/* 904 * Return the phy mode for with the specified channel so the 905 * caller can select a rate set. This is problematic for channels 906 * where multiple operating modes are possible (e.g. 11g+11b). 907 * In those cases we defer to the current operating mode when set. 908 */ 909enum ieee80211_phymode 910ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 911{ 912 if (IEEE80211_IS_CHAN_T(chan)) { 913 return IEEE80211_MODE_TURBO_A; 914 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 915 return IEEE80211_MODE_11A; 916 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 917 return IEEE80211_MODE_FH; 918 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 919 /* 920 * This assumes all 11g channels are also usable 921 * for 11b, which is currently true. 922 */ 923 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 924 return IEEE80211_MODE_TURBO_G; 925 if (ic->ic_curmode == IEEE80211_MODE_11B) 926 return IEEE80211_MODE_11B; 927 return IEEE80211_MODE_11G; 928 } else 929 return IEEE80211_MODE_11B; 930} 931 932/* 933 * convert IEEE80211 rate value to ifmedia subtype. 934 * ieee80211 rate is in unit of 0.5Mbps. 935 */ 936int 937ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 938{ 939#define N(a) (sizeof(a) / sizeof(a[0])) 940 static const struct { 941 u_int m; /* rate + mode */ 942 u_int r; /* if_media rate */ 943 } rates[] = { 944 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 945 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 946 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 947 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 948 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 949 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 950 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 951 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 952 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 953 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 954 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 955 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 956 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 957 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 958 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 959 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 960 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 961 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 962 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 963 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 964 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 965 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 966 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 967 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 968 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 969 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 970 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 971 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 972 }; 973 u_int mask, i; 974 975 mask = rate & IEEE80211_RATE_VAL; 976 switch (mode) { 977 case IEEE80211_MODE_11A: 978 case IEEE80211_MODE_TURBO_A: 979 mask |= IFM_IEEE80211_11A; 980 break; 981 case IEEE80211_MODE_11B: 982 mask |= IFM_IEEE80211_11B; 983 break; 984 case IEEE80211_MODE_FH: 985 mask |= IFM_IEEE80211_FH; 986 break; 987 case IEEE80211_MODE_AUTO: 988 /* NB: ic may be NULL for some drivers */ 989 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 990 mask |= IFM_IEEE80211_FH; 991 break; 992 } 993 /* NB: hack, 11g matches both 11b+11a rates */ 994 /* fall thru... */ 995 case IEEE80211_MODE_11G: 996 case IEEE80211_MODE_TURBO_G: 997 mask |= IFM_IEEE80211_11G; 998 break; 999 } 1000 for (i = 0; i < N(rates); i++) 1001 if (rates[i].m == mask) 1002 return rates[i].r; 1003 return IFM_AUTO; 1004#undef N 1005} 1006 1007int 1008ieee80211_media2rate(int mword) 1009{ 1010#define N(a) (sizeof(a) / sizeof(a[0])) 1011 static const int ieeerates[] = { 1012 -1, /* IFM_AUTO */ 1013 0, /* IFM_MANUAL */ 1014 0, /* IFM_NONE */ 1015 2, /* IFM_IEEE80211_FH1 */ 1016 4, /* IFM_IEEE80211_FH2 */ 1017 2, /* IFM_IEEE80211_DS1 */ 1018 4, /* IFM_IEEE80211_DS2 */ 1019 11, /* IFM_IEEE80211_DS5 */ 1020 22, /* IFM_IEEE80211_DS11 */ 1021 44, /* IFM_IEEE80211_DS22 */ 1022 12, /* IFM_IEEE80211_OFDM6 */ 1023 18, /* IFM_IEEE80211_OFDM9 */ 1024 24, /* IFM_IEEE80211_OFDM12 */ 1025 36, /* IFM_IEEE80211_OFDM18 */ 1026 48, /* IFM_IEEE80211_OFDM24 */ 1027 72, /* IFM_IEEE80211_OFDM36 */ 1028 96, /* IFM_IEEE80211_OFDM48 */ 1029 108, /* IFM_IEEE80211_OFDM54 */ 1030 144, /* IFM_IEEE80211_OFDM72 */ 1031 }; 1032 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1033 ieeerates[IFM_SUBTYPE(mword)] : 0; 1034#undef N 1035} 1036