ieee80211.c revision 164645
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 164645 2006-11-26 22:48:03Z 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/* 65 * Default supported rates for 802.11 operation (in IEEE .5Mb units). 66 */ 67#define B(r) ((r) | IEEE80211_RATE_BASIC) 68static const struct ieee80211_rateset ieee80211_rateset_11a = 69 { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } }; 70static const struct ieee80211_rateset ieee80211_rateset_11b = 71 { 4, { B(2), B(4), B(11), B(22) } }; 72/* NB: OFDM rates are handled specially based on mode */ 73static const struct ieee80211_rateset ieee80211_rateset_11g = 74 { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } }; 75#undef B 76 77/* list of all instances */ 78SLIST_HEAD(ieee80211_list, ieee80211com); 79static struct ieee80211_list ieee80211_list = 80 SLIST_HEAD_INITIALIZER(ieee80211_list); 81static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 82static struct mtx ieee80211_vap_mtx; 83MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF); 84 85static void 86ieee80211_add_vap(struct ieee80211com *ic) 87{ 88#define N(a) (sizeof(a)/sizeof(a[0])) 89 int i; 90 u_int8_t b; 91 92 mtx_lock(&ieee80211_vap_mtx); 93 ic->ic_vap = 0; 94 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 95 ic->ic_vap += NBBY; 96 if (i == N(ieee80211_vapmap)) 97 panic("vap table full"); 98 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 99 ic->ic_vap++; 100 setbit(ieee80211_vapmap, ic->ic_vap); 101 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 102 mtx_unlock(&ieee80211_vap_mtx); 103#undef N 104} 105 106static void 107ieee80211_remove_vap(struct ieee80211com *ic) 108{ 109 mtx_lock(&ieee80211_vap_mtx); 110 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 111 KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 112 ("invalid vap id %d", ic->ic_vap)); 113 KASSERT(isset(ieee80211_vapmap, ic->ic_vap), 114 ("vap id %d not allocated", ic->ic_vap)); 115 clrbit(ieee80211_vapmap, ic->ic_vap); 116 mtx_unlock(&ieee80211_vap_mtx); 117} 118 119/* 120 * Default reset method for use with the ioctl support. This 121 * method is invoked after any state change in the 802.11 122 * layer that should be propagated to the hardware but not 123 * require re-initialization of the 802.11 state machine (e.g 124 * rescanning for an ap). We always return ENETRESET which 125 * should cause the driver to re-initialize the device. Drivers 126 * can override this method to implement more optimized support. 127 */ 128static int 129ieee80211_default_reset(struct ifnet *ifp) 130{ 131 return ENETRESET; 132} 133 134void 135ieee80211_ifattach(struct ieee80211com *ic) 136{ 137#define RATESDEFINED(m) \ 138 ((ic->ic_modecaps & (1<<m)) && ic->ic_sup_rates[m].rs_nrates != 0) 139 struct ifnet *ifp = ic->ic_ifp; 140 struct ieee80211_channel *c; 141 int i; 142 143 ether_ifattach(ifp, ic->ic_myaddr); 144 ifp->if_output = ieee80211_output; 145 146 bpfattach2(ifp, DLT_IEEE802_11, 147 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 148 149 ieee80211_crypto_attach(ic); 150 151 /* 152 * Fill in 802.11 available channel set, mark 153 * all available channels as active, and pick 154 * a default channel if not already specified. 155 */ 156 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 157 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 158 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 159 c = &ic->ic_channels[i]; 160 if (c->ic_flags) { 161 /* 162 * Verify driver passed us valid data. 163 */ 164 if (i != ieee80211_chan2ieee(ic, c)) { 165 if_printf(ifp, "bad channel ignored; " 166 "freq %u flags %x number %u\n", 167 c->ic_freq, c->ic_flags, i); 168 c->ic_flags = 0; /* NB: remove */ 169 continue; 170 } 171 setbit(ic->ic_chan_avail, i); 172 /* 173 * Identify mode capabilities. 174 */ 175 if (IEEE80211_IS_CHAN_A(c)) 176 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 177 if (IEEE80211_IS_CHAN_B(c)) 178 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 179 if (IEEE80211_IS_CHAN_PUREG(c)) 180 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 181 if (IEEE80211_IS_CHAN_FHSS(c)) 182 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 183 if (IEEE80211_IS_CHAN_T(c)) 184 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 185 if (IEEE80211_IS_CHAN_108G(c)) 186 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 187 if (ic->ic_curchan == NULL) { 188 /* arbitrarily pick the first channel */ 189 ic->ic_curchan = &ic->ic_channels[i]; 190 } 191 } 192 } 193 /* validate ic->ic_curmode */ 194 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 195 ic->ic_curmode = IEEE80211_MODE_AUTO; 196 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 197 198 /* fillin well-known rate sets if driver has not specified */ 199 if (!RATESDEFINED(IEEE80211_MODE_11B)) 200 ic->ic_sup_rates[IEEE80211_MODE_11B] = ieee80211_rateset_11b; 201 if (!RATESDEFINED(IEEE80211_MODE_11G)) 202 ic->ic_sup_rates[IEEE80211_MODE_11G] = ieee80211_rateset_11g; 203 if (!RATESDEFINED(IEEE80211_MODE_11A)) 204 ic->ic_sup_rates[IEEE80211_MODE_11A] = ieee80211_rateset_11a; 205 if (!RATESDEFINED(IEEE80211_MODE_TURBO_A)) 206 ic->ic_sup_rates[IEEE80211_MODE_TURBO_A] = ieee80211_rateset_11a; 207 if (!RATESDEFINED(IEEE80211_MODE_TURBO_G)) 208 ic->ic_sup_rates[IEEE80211_MODE_TURBO_G] = ieee80211_rateset_11g; 209#if 0 210 /* 211 * Enable WME by default if we're capable. 212 */ 213 if (ic->ic_caps & IEEE80211_C_WME) 214 ic->ic_flags |= IEEE80211_F_WME; 215#endif 216 if (ic->ic_caps & IEEE80211_C_BURST) 217 ic->ic_flags |= IEEE80211_F_BURST; 218 (void) ieee80211_setmode(ic, ic->ic_curmode); 219 220 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 221 ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT; 222 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 223 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 224 225 ic->ic_lintval = ic->ic_bintval; 226 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 227 228 ieee80211_node_attach(ic); 229 ieee80211_proto_attach(ic); 230 231 ieee80211_add_vap(ic); 232 233 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 234 235 /* 236 * Install a default reset method for the ioctl support. 237 * The driver is expected to fill this in before calling us. 238 */ 239 if (ic->ic_reset == NULL) 240 ic->ic_reset = ieee80211_default_reset; 241 242 KASSERT(ifp->if_spare2 == NULL, ("oops, hosed")); 243 ifp->if_spare2 = ic; /* XXX temp backpointer */ 244#undef RATESDEFINED 245} 246 247void 248ieee80211_ifdetach(struct ieee80211com *ic) 249{ 250 struct ifnet *ifp = ic->ic_ifp; 251 252 ieee80211_remove_vap(ic); 253 254 ieee80211_sysctl_detach(ic); 255 ieee80211_proto_detach(ic); 256 ieee80211_crypto_detach(ic); 257 ieee80211_node_detach(ic); 258 ifmedia_removeall(&ic->ic_media); 259 260 IEEE80211_BEACON_LOCK_DESTROY(ic); 261 262 bpfdetach(ifp); 263 ether_ifdetach(ifp); 264} 265 266/* 267 * Convert MHz frequency to IEEE channel number. 268 */ 269int 270ieee80211_mhz2ieee(u_int freq, u_int flags) 271{ 272 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 273 if (freq == 2484) 274 return 14; 275 if (freq < 2484) 276 return ((int) freq - 2407) / 5; 277 else 278 return 15 + ((freq - 2512) / 20); 279 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 280 if (freq <= 5000) 281 return (freq - 4000) / 5; 282 else 283 return (freq - 5000) / 5; 284 } else { /* either, guess */ 285 if (freq == 2484) 286 return 14; 287 if (freq < 2484) 288 return ((int) freq - 2407) / 5; 289 if (freq < 5000) { 290 if (freq > 4900) 291 return (freq - 4000) / 5; 292 else 293 return 15 + ((freq - 2512) / 20); 294 } 295 return (freq - 5000) / 5; 296 } 297} 298 299/* 300 * Convert channel to IEEE channel number. 301 */ 302int 303ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 304{ 305 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 306 return c - ic->ic_channels; 307 else if (c == IEEE80211_CHAN_ANYC) 308 return IEEE80211_CHAN_ANY; 309 else if (c != NULL) { 310 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 311 c->ic_freq, c->ic_flags); 312 return 0; /* XXX */ 313 } else { 314 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 315 return 0; /* XXX */ 316 } 317} 318 319/* 320 * Convert IEEE channel number to MHz frequency. 321 */ 322u_int 323ieee80211_ieee2mhz(u_int chan, u_int flags) 324{ 325 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 326 if (chan == 14) 327 return 2484; 328 if (chan < 14) 329 return 2407 + chan*5; 330 else 331 return 2512 + ((chan-15)*20); 332 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 333 return 5000 + (chan*5); 334 } else { /* either, guess */ 335 if (chan == 14) 336 return 2484; 337 if (chan < 14) /* 0-13 */ 338 return 2407 + chan*5; 339 if (chan < 27) /* 15-26 */ 340 return 2512 + ((chan-15)*20); 341 return 5000 + (chan*5); 342 } 343} 344 345/* 346 * Setup the media data structures according to the channel and 347 * rate tables. This must be called by the driver after 348 * ieee80211_attach and before most anything else. 349 */ 350void 351ieee80211_media_init(struct ieee80211com *ic, 352 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 353{ 354#define ADD(_ic, _s, _o) \ 355 ifmedia_add(&(_ic)->ic_media, \ 356 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 357 struct ifnet *ifp = ic->ic_ifp; 358 struct ifmediareq imr; 359 int i, j, mode, rate, maxrate, mword, mopt, r; 360 struct ieee80211_rateset *rs; 361 struct ieee80211_rateset allrates; 362 363 /* 364 * Do late attach work that must wait for any subclass 365 * (i.e. driver) work such as overriding methods. 366 */ 367 ieee80211_node_lateattach(ic); 368 369 /* 370 * Fill in media characteristics. 371 */ 372 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 373 maxrate = 0; 374 memset(&allrates, 0, sizeof(allrates)); 375 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 376 static const u_int mopts[] = { 377 IFM_AUTO, 378 IFM_IEEE80211_11A, 379 IFM_IEEE80211_11B, 380 IFM_IEEE80211_11G, 381 IFM_IEEE80211_FH, 382 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 383 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 384 }; 385 if ((ic->ic_modecaps & (1<<mode)) == 0) 386 continue; 387 mopt = mopts[mode]; 388 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 389 if (ic->ic_caps & IEEE80211_C_IBSS) 390 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 391 if (ic->ic_caps & IEEE80211_C_HOSTAP) 392 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 393 if (ic->ic_caps & IEEE80211_C_AHDEMO) 394 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 395 if (ic->ic_caps & IEEE80211_C_MONITOR) 396 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 397 if (mode == IEEE80211_MODE_AUTO) 398 continue; 399 rs = &ic->ic_sup_rates[mode]; 400 for (i = 0; i < rs->rs_nrates; i++) { 401 rate = rs->rs_rates[i]; 402 mword = ieee80211_rate2media(ic, rate, mode); 403 if (mword == 0) 404 continue; 405 ADD(ic, mword, mopt); 406 if (ic->ic_caps & IEEE80211_C_IBSS) 407 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 408 if (ic->ic_caps & IEEE80211_C_HOSTAP) 409 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 410 if (ic->ic_caps & IEEE80211_C_AHDEMO) 411 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 412 if (ic->ic_caps & IEEE80211_C_MONITOR) 413 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 414 /* 415 * Add rate to the collection of all rates. 416 */ 417 r = rate & IEEE80211_RATE_VAL; 418 for (j = 0; j < allrates.rs_nrates; j++) 419 if (allrates.rs_rates[j] == r) 420 break; 421 if (j == allrates.rs_nrates) { 422 /* unique, add to the set */ 423 allrates.rs_rates[j] = r; 424 allrates.rs_nrates++; 425 } 426 rate = (rate & IEEE80211_RATE_VAL) / 2; 427 if (rate > maxrate) 428 maxrate = rate; 429 } 430 } 431 for (i = 0; i < allrates.rs_nrates; i++) { 432 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 433 IEEE80211_MODE_AUTO); 434 if (mword == 0) 435 continue; 436 mword = IFM_SUBTYPE(mword); /* remove media options */ 437 ADD(ic, mword, 0); 438 if (ic->ic_caps & IEEE80211_C_IBSS) 439 ADD(ic, mword, IFM_IEEE80211_ADHOC); 440 if (ic->ic_caps & IEEE80211_C_HOSTAP) 441 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 442 if (ic->ic_caps & IEEE80211_C_AHDEMO) 443 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 444 if (ic->ic_caps & IEEE80211_C_MONITOR) 445 ADD(ic, mword, IFM_IEEE80211_MONITOR); 446 } 447 ieee80211_media_status(ifp, &imr); 448 ifmedia_set(&ic->ic_media, imr.ifm_active); 449 450 if (maxrate) 451 ifp->if_baudrate = IF_Mbps(maxrate); 452#undef ADD 453} 454 455void 456ieee80211_announce(struct ieee80211com *ic) 457{ 458 struct ifnet *ifp = ic->ic_ifp; 459 int i, mode, rate, mword; 460 struct ieee80211_rateset *rs; 461 462 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 463 if ((ic->ic_modecaps & (1<<mode)) == 0) 464 continue; 465 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 466 rs = &ic->ic_sup_rates[mode]; 467 for (i = 0; i < rs->rs_nrates; i++) { 468 rate = rs->rs_rates[i]; 469 mword = ieee80211_rate2media(ic, rate, mode); 470 if (mword == 0) 471 continue; 472 printf("%s%d%sMbps", (i != 0 ? " " : ""), 473 (rate & IEEE80211_RATE_VAL) / 2, 474 ((rate & 0x1) != 0 ? ".5" : "")); 475 } 476 printf("\n"); 477 } 478} 479 480static int 481findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 482{ 483#define IEEERATE(_ic,_m,_i) \ 484 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 485 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 486 for (i = 0; i < nrates; i++) 487 if (IEEERATE(ic, mode, i) == rate) 488 return i; 489 return -1; 490#undef IEEERATE 491} 492 493/* 494 * Find an instance by it's mac address. 495 */ 496struct ieee80211com * 497ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 498{ 499 struct ieee80211com *ic; 500 501 /* XXX lock */ 502 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 503 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 504 return ic; 505 return NULL; 506} 507 508static struct ieee80211com * 509ieee80211_find_instance(struct ifnet *ifp) 510{ 511 struct ieee80211com *ic; 512 513 /* XXX lock */ 514 /* XXX not right for multiple instances but works for now */ 515 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 516 if (ic->ic_ifp == ifp) 517 return ic; 518 return NULL; 519} 520 521/* 522 * Handle a media change request. 523 */ 524int 525ieee80211_media_change(struct ifnet *ifp) 526{ 527 struct ieee80211com *ic; 528 struct ifmedia_entry *ime; 529 enum ieee80211_opmode newopmode; 530 enum ieee80211_phymode newphymode; 531 int i, j, newrate, error = 0; 532 533 ic = ieee80211_find_instance(ifp); 534 if (!ic) { 535 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 536 return EINVAL; 537 } 538 ime = ic->ic_media.ifm_cur; 539 /* 540 * First, identify the phy mode. 541 */ 542 switch (IFM_MODE(ime->ifm_media)) { 543 case IFM_IEEE80211_11A: 544 newphymode = IEEE80211_MODE_11A; 545 break; 546 case IFM_IEEE80211_11B: 547 newphymode = IEEE80211_MODE_11B; 548 break; 549 case IFM_IEEE80211_11G: 550 newphymode = IEEE80211_MODE_11G; 551 break; 552 case IFM_IEEE80211_FH: 553 newphymode = IEEE80211_MODE_FH; 554 break; 555 case IFM_AUTO: 556 newphymode = IEEE80211_MODE_AUTO; 557 break; 558 default: 559 return EINVAL; 560 } 561 /* 562 * Turbo mode is an ``option''. 563 * XXX does not apply to AUTO 564 */ 565 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 566 if (newphymode == IEEE80211_MODE_11A) 567 newphymode = IEEE80211_MODE_TURBO_A; 568 else if (newphymode == IEEE80211_MODE_11G) 569 newphymode = IEEE80211_MODE_TURBO_G; 570 else 571 return EINVAL; 572 } 573 /* 574 * Validate requested mode is available. 575 */ 576 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 577 return EINVAL; 578 579 /* 580 * Next, the fixed/variable rate. 581 */ 582 i = -1; 583 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 584 /* 585 * Convert media subtype to rate. 586 */ 587 newrate = ieee80211_media2rate(ime->ifm_media); 588 if (newrate == 0) 589 return EINVAL; 590 /* 591 * Check the rate table for the specified/current phy. 592 */ 593 if (newphymode == IEEE80211_MODE_AUTO) { 594 /* 595 * In autoselect mode search for the rate. 596 */ 597 for (j = IEEE80211_MODE_11A; 598 j < IEEE80211_MODE_MAX; j++) { 599 if ((ic->ic_modecaps & (1<<j)) == 0) 600 continue; 601 i = findrate(ic, j, newrate); 602 if (i != -1) { 603 /* lock mode too */ 604 newphymode = j; 605 break; 606 } 607 } 608 } else { 609 i = findrate(ic, newphymode, newrate); 610 } 611 if (i == -1) /* mode/rate mismatch */ 612 return EINVAL; 613 } 614 /* NB: defer rate setting to later */ 615 616 /* 617 * Deduce new operating mode but don't install it just yet. 618 */ 619 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 620 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 621 newopmode = IEEE80211_M_AHDEMO; 622 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 623 newopmode = IEEE80211_M_HOSTAP; 624 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 625 newopmode = IEEE80211_M_IBSS; 626 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 627 newopmode = IEEE80211_M_MONITOR; 628 else 629 newopmode = IEEE80211_M_STA; 630 631 /* 632 * Autoselect doesn't make sense when operating as an AP. 633 * If no phy mode has been selected, pick one and lock it 634 * down so rate tables can be used in forming beacon frames 635 * and the like. 636 */ 637 if (newopmode == IEEE80211_M_HOSTAP && 638 newphymode == IEEE80211_MODE_AUTO) { 639 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 640 if (ic->ic_modecaps & (1<<j)) { 641 newphymode = j; 642 break; 643 } 644 } 645 646 /* 647 * Handle phy mode change. 648 */ 649 if (ic->ic_curmode != newphymode) { /* change phy mode */ 650 error = ieee80211_setmode(ic, newphymode); 651 if (error != 0) 652 return error; 653 error = ENETRESET; 654 } 655 656 /* 657 * Committed to changes, install the rate setting. 658 */ 659 if (ic->ic_fixed_rate != i) { 660 ic->ic_fixed_rate = i; /* set fixed tx rate */ 661 error = ENETRESET; 662 } 663 664 /* 665 * Handle operating mode change. 666 */ 667 if (ic->ic_opmode != newopmode) { 668 ic->ic_opmode = newopmode; 669 switch (newopmode) { 670 case IEEE80211_M_AHDEMO: 671 case IEEE80211_M_HOSTAP: 672 case IEEE80211_M_STA: 673 case IEEE80211_M_MONITOR: 674 ic->ic_flags &= ~IEEE80211_F_IBSSON; 675 break; 676 case IEEE80211_M_IBSS: 677 ic->ic_flags |= IEEE80211_F_IBSSON; 678 break; 679 } 680 /* 681 * Yech, slot time may change depending on the 682 * operating mode so reset it to be sure everything 683 * is setup appropriately. 684 */ 685 ieee80211_reset_erp(ic); 686 ieee80211_wme_initparams(ic); /* after opmode change */ 687 error = ENETRESET; 688 } 689#ifdef notdef 690 if (error == 0) 691 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 692#endif 693 return error; 694} 695 696void 697ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 698{ 699 struct ieee80211com *ic; 700 struct ieee80211_rateset *rs; 701 702 ic = ieee80211_find_instance(ifp); 703 if (!ic) { 704 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 705 return; 706 } 707 imr->ifm_status = IFM_AVALID; 708 imr->ifm_active = IFM_IEEE80211; 709 if (ic->ic_state == IEEE80211_S_RUN) 710 imr->ifm_status |= IFM_ACTIVE; 711 /* 712 * Calculate a current rate if possible. 713 */ 714 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 715 /* 716 * A fixed rate is set, report that. 717 */ 718 rs = &ic->ic_sup_rates[ic->ic_curmode]; 719 imr->ifm_active |= ieee80211_rate2media(ic, 720 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 721 } else if (ic->ic_opmode == IEEE80211_M_STA) { 722 /* 723 * In station mode report the current transmit rate. 724 */ 725 rs = &ic->ic_bss->ni_rates; 726 imr->ifm_active |= ieee80211_rate2media(ic, 727 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 728 } else 729 imr->ifm_active |= IFM_AUTO; 730 switch (ic->ic_opmode) { 731 case IEEE80211_M_STA: 732 break; 733 case IEEE80211_M_IBSS: 734 imr->ifm_active |= IFM_IEEE80211_ADHOC; 735 break; 736 case IEEE80211_M_AHDEMO: 737 /* should not come here */ 738 break; 739 case IEEE80211_M_HOSTAP: 740 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 741 break; 742 case IEEE80211_M_MONITOR: 743 imr->ifm_active |= IFM_IEEE80211_MONITOR; 744 break; 745 } 746 switch (ic->ic_curmode) { 747 case IEEE80211_MODE_11A: 748 imr->ifm_active |= IFM_IEEE80211_11A; 749 break; 750 case IEEE80211_MODE_11B: 751 imr->ifm_active |= IFM_IEEE80211_11B; 752 break; 753 case IEEE80211_MODE_11G: 754 imr->ifm_active |= IFM_IEEE80211_11G; 755 break; 756 case IEEE80211_MODE_FH: 757 imr->ifm_active |= IFM_IEEE80211_FH; 758 break; 759 case IEEE80211_MODE_TURBO_A: 760 imr->ifm_active |= IFM_IEEE80211_11A 761 | IFM_IEEE80211_TURBO; 762 break; 763 case IEEE80211_MODE_TURBO_G: 764 imr->ifm_active |= IFM_IEEE80211_11G 765 | IFM_IEEE80211_TURBO; 766 break; 767 } 768} 769 770void 771ieee80211_watchdog(struct ieee80211com *ic) 772{ 773 struct ieee80211_node_table *nt; 774 int need_inact_timer = 0; 775 776 if (ic->ic_state != IEEE80211_S_INIT) { 777 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 778 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 779 nt = &ic->ic_scan; 780 if (nt->nt_inact_timer) { 781 if (--nt->nt_inact_timer == 0) 782 nt->nt_timeout(nt); 783 need_inact_timer += nt->nt_inact_timer; 784 } 785 nt = &ic->ic_sta; 786 if (nt->nt_inact_timer) { 787 if (--nt->nt_inact_timer == 0) 788 nt->nt_timeout(nt); 789 need_inact_timer += nt->nt_inact_timer; 790 } 791 } 792 if (ic->ic_mgt_timer != 0 || need_inact_timer) 793 ic->ic_ifp->if_timer = 1; 794} 795 796/* 797 * Set the current phy mode and recalculate the active channel 798 * set based on the available channels for this mode. Also 799 * select a new default/current channel if the current one is 800 * inappropriate for this mode. 801 */ 802int 803ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 804{ 805#define N(a) (sizeof(a) / sizeof(a[0])) 806 static const u_int chanflags[] = { 807 0, /* IEEE80211_MODE_AUTO */ 808 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 809 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 810 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 811 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 812 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 813 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 814 }; 815 struct ieee80211_channel *c; 816 u_int modeflags; 817 int i; 818 819 /* validate new mode */ 820 if ((ic->ic_modecaps & (1<<mode)) == 0) { 821 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 822 "%s: mode %u not supported (caps 0x%x)\n", 823 __func__, mode, ic->ic_modecaps); 824 return EINVAL; 825 } 826 827 /* 828 * Verify at least one channel is present in the available 829 * channel list before committing to the new mode. 830 */ 831 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 832 modeflags = chanflags[mode]; 833 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 834 c = &ic->ic_channels[i]; 835 if (c->ic_flags == 0) 836 continue; 837 if (mode == IEEE80211_MODE_AUTO) { 838 /* ignore static turbo channels for autoselect */ 839 if (!IEEE80211_IS_CHAN_T(c)) 840 break; 841 } else { 842 if ((c->ic_flags & modeflags) == modeflags) 843 break; 844 } 845 } 846 if (i > IEEE80211_CHAN_MAX) { 847 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 848 "%s: no channels found for mode %u\n", __func__, mode); 849 return EINVAL; 850 } 851 852 /* 853 * Calculate the active channel set. 854 */ 855 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 856 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 857 c = &ic->ic_channels[i]; 858 if (c->ic_flags == 0) 859 continue; 860 if (mode == IEEE80211_MODE_AUTO) { 861 /* take anything but static turbo channels */ 862 if (!IEEE80211_IS_CHAN_T(c)) 863 setbit(ic->ic_chan_active, i); 864 } else { 865 if ((c->ic_flags & modeflags) == modeflags) 866 setbit(ic->ic_chan_active, i); 867 } 868 } 869 /* 870 * If no current/default channel is setup or the current 871 * channel is wrong for the mode then pick the first 872 * available channel from the active list. This is likely 873 * not the right one. 874 */ 875 if (ic->ic_ibss_chan == NULL || 876 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 877 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 878 if (isset(ic->ic_chan_active, i)) { 879 ic->ic_ibss_chan = &ic->ic_channels[i]; 880 break; 881 } 882 KASSERT(ic->ic_ibss_chan != NULL && 883 isset(ic->ic_chan_active, 884 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 885 ("Bad IBSS channel %u", 886 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 887 } 888 /* 889 * If the desired channel is set but no longer valid then reset it. 890 */ 891 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 892 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 893 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 894 895 /* 896 * Do mode-specific rate setup. 897 */ 898 if (mode == IEEE80211_MODE_11G) { 899 /* 900 * Use a mixed 11b/11g rate set. 901 */ 902 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 903 IEEE80211_MODE_11G); 904 } else if (mode == IEEE80211_MODE_11B) { 905 /* 906 * Force pure 11b rate set. 907 */ 908 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 909 IEEE80211_MODE_11B); 910 } 911 /* 912 * Setup an initial rate set according to the 913 * current/default channel selected above. This 914 * will be changed when scanning but must exist 915 * now so driver have a consistent state of ic_ibss_chan. 916 */ 917 if (ic->ic_bss) /* NB: can be called before lateattach */ 918 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 919 920 ic->ic_curmode = mode; 921 ieee80211_reset_erp(ic); /* reset ERP state */ 922 ieee80211_wme_initparams(ic); /* reset WME stat */ 923 924 return 0; 925#undef N 926} 927 928/* 929 * Return the phy mode for with the specified channel so the 930 * caller can select a rate set. This is problematic for channels 931 * where multiple operating modes are possible (e.g. 11g+11b). 932 * In those cases we defer to the current operating mode when set. 933 */ 934enum ieee80211_phymode 935ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 936{ 937 if (IEEE80211_IS_CHAN_T(chan)) { 938 return IEEE80211_MODE_TURBO_A; 939 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 940 return IEEE80211_MODE_11A; 941 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 942 return IEEE80211_MODE_FH; 943 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 944 /* 945 * This assumes all 11g channels are also usable 946 * for 11b, which is currently true. 947 */ 948 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 949 return IEEE80211_MODE_TURBO_G; 950 if (ic->ic_curmode == IEEE80211_MODE_11B) 951 return IEEE80211_MODE_11B; 952 return IEEE80211_MODE_11G; 953 } else 954 return IEEE80211_MODE_11B; 955} 956 957/* 958 * convert IEEE80211 rate value to ifmedia subtype. 959 * ieee80211 rate is in unit of 0.5Mbps. 960 */ 961int 962ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 963{ 964#define N(a) (sizeof(a) / sizeof(a[0])) 965 static const struct { 966 u_int m; /* rate + mode */ 967 u_int r; /* if_media rate */ 968 } rates[] = { 969 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 970 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 971 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 972 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 973 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 974 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 975 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 976 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 977 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 978 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 979 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 980 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 981 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 982 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 983 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 984 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 985 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 986 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 987 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 988 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 989 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 990 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 991 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 992 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 993 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 994 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 995 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 996 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 997 }; 998 u_int mask, i; 999 1000 mask = rate & IEEE80211_RATE_VAL; 1001 switch (mode) { 1002 case IEEE80211_MODE_11A: 1003 case IEEE80211_MODE_TURBO_A: 1004 mask |= IFM_IEEE80211_11A; 1005 break; 1006 case IEEE80211_MODE_11B: 1007 mask |= IFM_IEEE80211_11B; 1008 break; 1009 case IEEE80211_MODE_FH: 1010 mask |= IFM_IEEE80211_FH; 1011 break; 1012 case IEEE80211_MODE_AUTO: 1013 /* NB: ic may be NULL for some drivers */ 1014 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1015 mask |= IFM_IEEE80211_FH; 1016 break; 1017 } 1018 /* NB: hack, 11g matches both 11b+11a rates */ 1019 /* fall thru... */ 1020 case IEEE80211_MODE_11G: 1021 case IEEE80211_MODE_TURBO_G: 1022 mask |= IFM_IEEE80211_11G; 1023 break; 1024 } 1025 for (i = 0; i < N(rates); i++) 1026 if (rates[i].m == mask) 1027 return rates[i].r; 1028 return IFM_AUTO; 1029#undef N 1030} 1031 1032int 1033ieee80211_media2rate(int mword) 1034{ 1035#define N(a) (sizeof(a) / sizeof(a[0])) 1036 static const int ieeerates[] = { 1037 -1, /* IFM_AUTO */ 1038 0, /* IFM_MANUAL */ 1039 0, /* IFM_NONE */ 1040 2, /* IFM_IEEE80211_FH1 */ 1041 4, /* IFM_IEEE80211_FH2 */ 1042 2, /* IFM_IEEE80211_DS1 */ 1043 4, /* IFM_IEEE80211_DS2 */ 1044 11, /* IFM_IEEE80211_DS5 */ 1045 22, /* IFM_IEEE80211_DS11 */ 1046 44, /* IFM_IEEE80211_DS22 */ 1047 12, /* IFM_IEEE80211_OFDM6 */ 1048 18, /* IFM_IEEE80211_OFDM9 */ 1049 24, /* IFM_IEEE80211_OFDM12 */ 1050 36, /* IFM_IEEE80211_OFDM18 */ 1051 48, /* IFM_IEEE80211_OFDM24 */ 1052 72, /* IFM_IEEE80211_OFDM36 */ 1053 96, /* IFM_IEEE80211_OFDM48 */ 1054 108, /* IFM_IEEE80211_OFDM54 */ 1055 144, /* IFM_IEEE80211_OFDM72 */ 1056 }; 1057 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1058 ieeerates[IFM_SUBTYPE(mword)] : 0; 1059#undef N 1060} 1061