ieee80211.c revision 158044
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 158044 2006-04-26 16:00:37Z 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 if (ic->ic_caps & IEEE80211_C_BURST) 188 ic->ic_flags |= IEEE80211_F_BURST; 189 (void) ieee80211_setmode(ic, ic->ic_curmode); 190 191 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 192 ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT; 193 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 194 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 195 196 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 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 240 if (freq == 2484) 241 return 14; 242 if (freq < 2484) 243 return ((int) freq - 2407) / 5; 244 else 245 return 15 + ((freq - 2512) / 20); 246 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 247 if (freq <= 5000) 248 return (freq - 4000) / 5; 249 else 250 return (freq - 5000) / 5; 251 } else { /* either, guess */ 252 if (freq == 2484) 253 return 14; 254 if (freq < 2484) 255 return ((int) freq - 2407) / 5; 256 if (freq < 5000) { 257 if (freq > 4900) 258 return (freq - 4000) / 5; 259 else 260 return 15 + ((freq - 2512) / 20); 261 } 262 return (freq - 5000) / 5; 263 } 264} 265 266/* 267 * Convert channel to IEEE channel number. 268 */ 269int 270ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 271{ 272 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 273 return c - ic->ic_channels; 274 else if (c == IEEE80211_CHAN_ANYC) 275 return IEEE80211_CHAN_ANY; 276 else if (c != NULL) { 277 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 278 c->ic_freq, c->ic_flags); 279 return 0; /* XXX */ 280 } else { 281 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 282 return 0; /* XXX */ 283 } 284} 285 286/* 287 * Convert IEEE channel number to MHz frequency. 288 */ 289u_int 290ieee80211_ieee2mhz(u_int chan, u_int flags) 291{ 292 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 293 if (chan == 14) 294 return 2484; 295 if (chan < 14) 296 return 2407 + chan*5; 297 else 298 return 2512 + ((chan-15)*20); 299 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 300 return 5000 + (chan*5); 301 } else { /* either, guess */ 302 if (chan == 14) 303 return 2484; 304 if (chan < 14) /* 0-13 */ 305 return 2407 + chan*5; 306 if (chan < 27) /* 15-26 */ 307 return 2512 + ((chan-15)*20); 308 return 5000 + (chan*5); 309 } 310} 311 312/* 313 * Setup the media data structures according to the channel and 314 * rate tables. This must be called by the driver after 315 * ieee80211_attach and before most anything else. 316 */ 317void 318ieee80211_media_init(struct ieee80211com *ic, 319 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 320{ 321#define ADD(_ic, _s, _o) \ 322 ifmedia_add(&(_ic)->ic_media, \ 323 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 324 struct ifnet *ifp = ic->ic_ifp; 325 struct ifmediareq imr; 326 int i, j, mode, rate, maxrate, mword, mopt, r; 327 struct ieee80211_rateset *rs; 328 struct ieee80211_rateset allrates; 329 330 /* 331 * Do late attach work that must wait for any subclass 332 * (i.e. driver) work such as overriding methods. 333 */ 334 ieee80211_node_lateattach(ic); 335 336 /* 337 * Fill in media characteristics. 338 */ 339 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 340 maxrate = 0; 341 memset(&allrates, 0, sizeof(allrates)); 342 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 343 static const u_int mopts[] = { 344 IFM_AUTO, 345 IFM_IEEE80211_11A, 346 IFM_IEEE80211_11B, 347 IFM_IEEE80211_11G, 348 IFM_IEEE80211_FH, 349 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 350 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 351 }; 352 if ((ic->ic_modecaps & (1<<mode)) == 0) 353 continue; 354 mopt = mopts[mode]; 355 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 356 if (ic->ic_caps & IEEE80211_C_IBSS) 357 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 358 if (ic->ic_caps & IEEE80211_C_HOSTAP) 359 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 360 if (ic->ic_caps & IEEE80211_C_AHDEMO) 361 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 362 if (ic->ic_caps & IEEE80211_C_MONITOR) 363 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 364 if (mode == IEEE80211_MODE_AUTO) 365 continue; 366 rs = &ic->ic_sup_rates[mode]; 367 for (i = 0; i < rs->rs_nrates; i++) { 368 rate = rs->rs_rates[i]; 369 mword = ieee80211_rate2media(ic, rate, mode); 370 if (mword == 0) 371 continue; 372 ADD(ic, mword, mopt); 373 if (ic->ic_caps & IEEE80211_C_IBSS) 374 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 375 if (ic->ic_caps & IEEE80211_C_HOSTAP) 376 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 377 if (ic->ic_caps & IEEE80211_C_AHDEMO) 378 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 379 if (ic->ic_caps & IEEE80211_C_MONITOR) 380 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 381 /* 382 * Add rate to the collection of all rates. 383 */ 384 r = rate & IEEE80211_RATE_VAL; 385 for (j = 0; j < allrates.rs_nrates; j++) 386 if (allrates.rs_rates[j] == r) 387 break; 388 if (j == allrates.rs_nrates) { 389 /* unique, add to the set */ 390 allrates.rs_rates[j] = r; 391 allrates.rs_nrates++; 392 } 393 rate = (rate & IEEE80211_RATE_VAL) / 2; 394 if (rate > maxrate) 395 maxrate = rate; 396 } 397 } 398 for (i = 0; i < allrates.rs_nrates; i++) { 399 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 400 IEEE80211_MODE_AUTO); 401 if (mword == 0) 402 continue; 403 mword = IFM_SUBTYPE(mword); /* remove media options */ 404 ADD(ic, mword, 0); 405 if (ic->ic_caps & IEEE80211_C_IBSS) 406 ADD(ic, mword, IFM_IEEE80211_ADHOC); 407 if (ic->ic_caps & IEEE80211_C_HOSTAP) 408 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 409 if (ic->ic_caps & IEEE80211_C_AHDEMO) 410 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 411 if (ic->ic_caps & IEEE80211_C_MONITOR) 412 ADD(ic, mword, IFM_IEEE80211_MONITOR); 413 } 414 ieee80211_media_status(ifp, &imr); 415 ifmedia_set(&ic->ic_media, imr.ifm_active); 416 417 if (maxrate) 418 ifp->if_baudrate = IF_Mbps(maxrate); 419#undef ADD 420} 421 422void 423ieee80211_announce(struct ieee80211com *ic) 424{ 425 struct ifnet *ifp = ic->ic_ifp; 426 int i, mode, rate, mword; 427 struct ieee80211_rateset *rs; 428 429 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 430 if ((ic->ic_modecaps & (1<<mode)) == 0) 431 continue; 432 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 433 rs = &ic->ic_sup_rates[mode]; 434 for (i = 0; i < rs->rs_nrates; i++) { 435 rate = rs->rs_rates[i]; 436 mword = ieee80211_rate2media(ic, rate, mode); 437 if (mword == 0) 438 continue; 439 printf("%s%d%sMbps", (i != 0 ? " " : ""), 440 (rate & IEEE80211_RATE_VAL) / 2, 441 ((rate & 0x1) != 0 ? ".5" : "")); 442 } 443 printf("\n"); 444 } 445} 446 447static int 448findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 449{ 450#define IEEERATE(_ic,_m,_i) \ 451 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 452 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 453 for (i = 0; i < nrates; i++) 454 if (IEEERATE(ic, mode, i) == rate) 455 return i; 456 return -1; 457#undef IEEERATE 458} 459 460/* 461 * Find an instance by it's mac address. 462 */ 463struct ieee80211com * 464ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 465{ 466 struct ieee80211com *ic; 467 468 /* XXX lock */ 469 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 470 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 471 return ic; 472 return NULL; 473} 474 475static struct ieee80211com * 476ieee80211_find_instance(struct ifnet *ifp) 477{ 478 struct ieee80211com *ic; 479 480 /* XXX lock */ 481 /* XXX not right for multiple instances but works for now */ 482 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 483 if (ic->ic_ifp == ifp) 484 return ic; 485 return NULL; 486} 487 488/* 489 * Handle a media change request. 490 */ 491int 492ieee80211_media_change(struct ifnet *ifp) 493{ 494 struct ieee80211com *ic; 495 struct ifmedia_entry *ime; 496 enum ieee80211_opmode newopmode; 497 enum ieee80211_phymode newphymode; 498 int i, j, newrate, error = 0; 499 500 ic = ieee80211_find_instance(ifp); 501 if (!ic) { 502 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 503 return EINVAL; 504 } 505 ime = ic->ic_media.ifm_cur; 506 /* 507 * First, identify the phy mode. 508 */ 509 switch (IFM_MODE(ime->ifm_media)) { 510 case IFM_IEEE80211_11A: 511 newphymode = IEEE80211_MODE_11A; 512 break; 513 case IFM_IEEE80211_11B: 514 newphymode = IEEE80211_MODE_11B; 515 break; 516 case IFM_IEEE80211_11G: 517 newphymode = IEEE80211_MODE_11G; 518 break; 519 case IFM_IEEE80211_FH: 520 newphymode = IEEE80211_MODE_FH; 521 break; 522 case IFM_AUTO: 523 newphymode = IEEE80211_MODE_AUTO; 524 break; 525 default: 526 return EINVAL; 527 } 528 /* 529 * Turbo mode is an ``option''. 530 * XXX does not apply to AUTO 531 */ 532 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 533 if (newphymode == IEEE80211_MODE_11A) 534 newphymode = IEEE80211_MODE_TURBO_A; 535 else if (newphymode == IEEE80211_MODE_11G) 536 newphymode = IEEE80211_MODE_TURBO_G; 537 else 538 return EINVAL; 539 } 540 /* 541 * Validate requested mode is available. 542 */ 543 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 544 return EINVAL; 545 546 /* 547 * Next, the fixed/variable rate. 548 */ 549 i = -1; 550 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 551 /* 552 * Convert media subtype to rate. 553 */ 554 newrate = ieee80211_media2rate(ime->ifm_media); 555 if (newrate == 0) 556 return EINVAL; 557 /* 558 * Check the rate table for the specified/current phy. 559 */ 560 if (newphymode == IEEE80211_MODE_AUTO) { 561 /* 562 * In autoselect mode search for the rate. 563 */ 564 for (j = IEEE80211_MODE_11A; 565 j < IEEE80211_MODE_MAX; j++) { 566 if ((ic->ic_modecaps & (1<<j)) == 0) 567 continue; 568 i = findrate(ic, j, newrate); 569 if (i != -1) { 570 /* lock mode too */ 571 newphymode = j; 572 break; 573 } 574 } 575 } else { 576 i = findrate(ic, newphymode, newrate); 577 } 578 if (i == -1) /* mode/rate mismatch */ 579 return EINVAL; 580 } 581 /* NB: defer rate setting to later */ 582 583 /* 584 * Deduce new operating mode but don't install it just yet. 585 */ 586 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 587 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 588 newopmode = IEEE80211_M_AHDEMO; 589 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 590 newopmode = IEEE80211_M_HOSTAP; 591 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 592 newopmode = IEEE80211_M_IBSS; 593 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 594 newopmode = IEEE80211_M_MONITOR; 595 else 596 newopmode = IEEE80211_M_STA; 597 598 /* 599 * Autoselect doesn't make sense when operating as an AP. 600 * If no phy mode has been selected, pick one and lock it 601 * down so rate tables can be used in forming beacon frames 602 * and the like. 603 */ 604 if (newopmode == IEEE80211_M_HOSTAP && 605 newphymode == IEEE80211_MODE_AUTO) { 606 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 607 if (ic->ic_modecaps & (1<<j)) { 608 newphymode = j; 609 break; 610 } 611 } 612 613 /* 614 * Handle phy mode change. 615 */ 616 if (ic->ic_curmode != newphymode) { /* change phy mode */ 617 error = ieee80211_setmode(ic, newphymode); 618 if (error != 0) 619 return error; 620 error = ENETRESET; 621 } 622 623 /* 624 * Committed to changes, install the rate setting. 625 */ 626 if (ic->ic_fixed_rate != i) { 627 ic->ic_fixed_rate = i; /* set fixed tx rate */ 628 error = ENETRESET; 629 } 630 631 /* 632 * Handle operating mode change. 633 */ 634 if (ic->ic_opmode != newopmode) { 635 ic->ic_opmode = newopmode; 636 switch (newopmode) { 637 case IEEE80211_M_AHDEMO: 638 case IEEE80211_M_HOSTAP: 639 case IEEE80211_M_STA: 640 case IEEE80211_M_MONITOR: 641 ic->ic_flags &= ~IEEE80211_F_IBSSON; 642 break; 643 case IEEE80211_M_IBSS: 644 ic->ic_flags |= IEEE80211_F_IBSSON; 645 break; 646 } 647 /* 648 * Yech, slot time may change depending on the 649 * operating mode so reset it to be sure everything 650 * is setup appropriately. 651 */ 652 ieee80211_reset_erp(ic); 653 ieee80211_wme_initparams(ic); /* after opmode change */ 654 error = ENETRESET; 655 } 656#ifdef notdef 657 if (error == 0) 658 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 659#endif 660 return error; 661} 662 663void 664ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 665{ 666 struct ieee80211com *ic; 667 struct ieee80211_rateset *rs; 668 669 ic = ieee80211_find_instance(ifp); 670 if (!ic) { 671 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 672 return; 673 } 674 imr->ifm_status = IFM_AVALID; 675 imr->ifm_active = IFM_IEEE80211; 676 if (ic->ic_state == IEEE80211_S_RUN) 677 imr->ifm_status |= IFM_ACTIVE; 678 /* 679 * Calculate a current rate if possible. 680 */ 681 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 682 /* 683 * A fixed rate is set, report that. 684 */ 685 rs = &ic->ic_sup_rates[ic->ic_curmode]; 686 imr->ifm_active |= ieee80211_rate2media(ic, 687 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 688 } else if (ic->ic_opmode == IEEE80211_M_STA) { 689 /* 690 * In station mode report the current transmit rate. 691 */ 692 rs = &ic->ic_bss->ni_rates; 693 imr->ifm_active |= ieee80211_rate2media(ic, 694 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 695 } else 696 imr->ifm_active |= IFM_AUTO; 697 switch (ic->ic_opmode) { 698 case IEEE80211_M_STA: 699 break; 700 case IEEE80211_M_IBSS: 701 imr->ifm_active |= IFM_IEEE80211_ADHOC; 702 break; 703 case IEEE80211_M_AHDEMO: 704 /* should not come here */ 705 break; 706 case IEEE80211_M_HOSTAP: 707 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 708 break; 709 case IEEE80211_M_MONITOR: 710 imr->ifm_active |= IFM_IEEE80211_MONITOR; 711 break; 712 } 713 switch (ic->ic_curmode) { 714 case IEEE80211_MODE_11A: 715 imr->ifm_active |= IFM_IEEE80211_11A; 716 break; 717 case IEEE80211_MODE_11B: 718 imr->ifm_active |= IFM_IEEE80211_11B; 719 break; 720 case IEEE80211_MODE_11G: 721 imr->ifm_active |= IFM_IEEE80211_11G; 722 break; 723 case IEEE80211_MODE_FH: 724 imr->ifm_active |= IFM_IEEE80211_FH; 725 break; 726 case IEEE80211_MODE_TURBO_A: 727 imr->ifm_active |= IFM_IEEE80211_11A 728 | IFM_IEEE80211_TURBO; 729 break; 730 case IEEE80211_MODE_TURBO_G: 731 imr->ifm_active |= IFM_IEEE80211_11G 732 | IFM_IEEE80211_TURBO; 733 break; 734 } 735} 736 737void 738ieee80211_watchdog(struct ieee80211com *ic) 739{ 740 struct ieee80211_node_table *nt; 741 int need_inact_timer = 0; 742 743 if (ic->ic_state != IEEE80211_S_INIT) { 744 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 745 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 746 nt = &ic->ic_scan; 747 if (nt->nt_inact_timer) { 748 if (--nt->nt_inact_timer == 0) 749 nt->nt_timeout(nt); 750 need_inact_timer += nt->nt_inact_timer; 751 } 752 nt = &ic->ic_sta; 753 if (nt->nt_inact_timer) { 754 if (--nt->nt_inact_timer == 0) 755 nt->nt_timeout(nt); 756 need_inact_timer += nt->nt_inact_timer; 757 } 758 } 759 if (ic->ic_mgt_timer != 0 || need_inact_timer) 760 ic->ic_ifp->if_timer = 1; 761} 762 763/* 764 * Set the current phy mode and recalculate the active channel 765 * set based on the available channels for this mode. Also 766 * select a new default/current channel if the current one is 767 * inappropriate for this mode. 768 */ 769int 770ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 771{ 772#define N(a) (sizeof(a) / sizeof(a[0])) 773 static const u_int chanflags[] = { 774 0, /* IEEE80211_MODE_AUTO */ 775 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 776 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 777 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 778 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 779 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 780 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 781 }; 782 struct ieee80211_channel *c; 783 u_int modeflags; 784 int i; 785 786 /* validate new mode */ 787 if ((ic->ic_modecaps & (1<<mode)) == 0) { 788 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 789 "%s: mode %u not supported (caps 0x%x)\n", 790 __func__, mode, ic->ic_modecaps); 791 return EINVAL; 792 } 793 794 /* 795 * Verify at least one channel is present in the available 796 * channel list before committing to the new mode. 797 */ 798 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 799 modeflags = chanflags[mode]; 800 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 801 c = &ic->ic_channels[i]; 802 if (c->ic_flags == 0) 803 continue; 804 if (mode == IEEE80211_MODE_AUTO) { 805 /* ignore static turbo channels for autoselect */ 806 if (!IEEE80211_IS_CHAN_T(c)) 807 break; 808 } else { 809 if ((c->ic_flags & modeflags) == modeflags) 810 break; 811 } 812 } 813 if (i > IEEE80211_CHAN_MAX) { 814 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 815 "%s: no channels found for mode %u\n", __func__, mode); 816 return EINVAL; 817 } 818 819 /* 820 * Calculate the active channel set. 821 */ 822 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 823 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 824 c = &ic->ic_channels[i]; 825 if (c->ic_flags == 0) 826 continue; 827 if (mode == IEEE80211_MODE_AUTO) { 828 /* take anything but static turbo channels */ 829 if (!IEEE80211_IS_CHAN_T(c)) 830 setbit(ic->ic_chan_active, i); 831 } else { 832 if ((c->ic_flags & modeflags) == modeflags) 833 setbit(ic->ic_chan_active, i); 834 } 835 } 836 /* 837 * If no current/default channel is setup or the current 838 * channel is wrong for the mode then pick the first 839 * available channel from the active list. This is likely 840 * not the right one. 841 */ 842 if (ic->ic_ibss_chan == NULL || 843 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 844 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 845 if (isset(ic->ic_chan_active, i)) { 846 ic->ic_ibss_chan = &ic->ic_channels[i]; 847 break; 848 } 849 KASSERT(ic->ic_ibss_chan != NULL && 850 isset(ic->ic_chan_active, 851 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 852 ("Bad IBSS channel %u", 853 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 854 } 855 /* 856 * If the desired channel is set but no longer valid then reset it. 857 */ 858 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 859 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 860 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 861 862 /* 863 * Do mode-specific rate setup. 864 */ 865 if (mode == IEEE80211_MODE_11G) { 866 /* 867 * Use a mixed 11b/11g rate set. 868 */ 869 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 870 IEEE80211_MODE_11G); 871 } else if (mode == IEEE80211_MODE_11B) { 872 /* 873 * Force pure 11b rate set. 874 */ 875 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 876 IEEE80211_MODE_11B); 877 } 878 /* 879 * Setup an initial rate set according to the 880 * current/default channel selected above. This 881 * will be changed when scanning but must exist 882 * now so driver have a consistent state of ic_ibss_chan. 883 */ 884 if (ic->ic_bss) /* NB: can be called before lateattach */ 885 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 886 887 ic->ic_curmode = mode; 888 ieee80211_reset_erp(ic); /* reset ERP state */ 889 ieee80211_wme_initparams(ic); /* reset WME stat */ 890 891 return 0; 892#undef N 893} 894 895/* 896 * Return the phy mode for with the specified channel so the 897 * caller can select a rate set. This is problematic for channels 898 * where multiple operating modes are possible (e.g. 11g+11b). 899 * In those cases we defer to the current operating mode when set. 900 */ 901enum ieee80211_phymode 902ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 903{ 904 if (IEEE80211_IS_CHAN_T(chan)) { 905 return IEEE80211_MODE_TURBO_A; 906 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 907 return IEEE80211_MODE_11A; 908 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 909 return IEEE80211_MODE_FH; 910 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 911 /* 912 * This assumes all 11g channels are also usable 913 * for 11b, which is currently true. 914 */ 915 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 916 return IEEE80211_MODE_TURBO_G; 917 if (ic->ic_curmode == IEEE80211_MODE_11B) 918 return IEEE80211_MODE_11B; 919 return IEEE80211_MODE_11G; 920 } else 921 return IEEE80211_MODE_11B; 922} 923 924/* 925 * convert IEEE80211 rate value to ifmedia subtype. 926 * ieee80211 rate is in unit of 0.5Mbps. 927 */ 928int 929ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 930{ 931#define N(a) (sizeof(a) / sizeof(a[0])) 932 static const struct { 933 u_int m; /* rate + mode */ 934 u_int r; /* if_media rate */ 935 } rates[] = { 936 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 937 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 938 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 939 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 940 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 941 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 942 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 943 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 944 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 945 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 946 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 947 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 948 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 949 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 950 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 951 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 952 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 953 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 954 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 955 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 956 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 957 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 958 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 959 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 960 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 961 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 962 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 963 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 964 }; 965 u_int mask, i; 966 967 mask = rate & IEEE80211_RATE_VAL; 968 switch (mode) { 969 case IEEE80211_MODE_11A: 970 case IEEE80211_MODE_TURBO_A: 971 mask |= IFM_IEEE80211_11A; 972 break; 973 case IEEE80211_MODE_11B: 974 mask |= IFM_IEEE80211_11B; 975 break; 976 case IEEE80211_MODE_FH: 977 mask |= IFM_IEEE80211_FH; 978 break; 979 case IEEE80211_MODE_AUTO: 980 /* NB: ic may be NULL for some drivers */ 981 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 982 mask |= IFM_IEEE80211_FH; 983 break; 984 } 985 /* NB: hack, 11g matches both 11b+11a rates */ 986 /* fall thru... */ 987 case IEEE80211_MODE_11G: 988 case IEEE80211_MODE_TURBO_G: 989 mask |= IFM_IEEE80211_11G; 990 break; 991 } 992 for (i = 0; i < N(rates); i++) 993 if (rates[i].m == mask) 994 return rates[i].r; 995 return IFM_AUTO; 996#undef N 997} 998 999int 1000ieee80211_media2rate(int mword) 1001{ 1002#define N(a) (sizeof(a) / sizeof(a[0])) 1003 static const int ieeerates[] = { 1004 -1, /* IFM_AUTO */ 1005 0, /* IFM_MANUAL */ 1006 0, /* IFM_NONE */ 1007 2, /* IFM_IEEE80211_FH1 */ 1008 4, /* IFM_IEEE80211_FH2 */ 1009 2, /* IFM_IEEE80211_DS1 */ 1010 4, /* IFM_IEEE80211_DS2 */ 1011 11, /* IFM_IEEE80211_DS5 */ 1012 22, /* IFM_IEEE80211_DS11 */ 1013 44, /* IFM_IEEE80211_DS22 */ 1014 12, /* IFM_IEEE80211_OFDM6 */ 1015 18, /* IFM_IEEE80211_OFDM9 */ 1016 24, /* IFM_IEEE80211_OFDM12 */ 1017 36, /* IFM_IEEE80211_OFDM18 */ 1018 48, /* IFM_IEEE80211_OFDM24 */ 1019 72, /* IFM_IEEE80211_OFDM36 */ 1020 96, /* IFM_IEEE80211_OFDM48 */ 1021 108, /* IFM_IEEE80211_OFDM54 */ 1022 144, /* IFM_IEEE80211_OFDM72 */ 1023 }; 1024 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1025 ieeerates[IFM_SUBTYPE(mword)] : 0; 1026#undef N 1027} 1028