ieee80211.c revision 118887
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002, 2003 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 118887 2003-08-13 22:09:44Z sam $"); 35 36/* 37 * IEEE 802.11 generic handler 38 */ 39 40#include "opt_inet.h" 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/mbuf.h> 45#include <sys/malloc.h> 46#include <sys/kernel.h> 47#include <sys/socket.h> 48#include <sys/sockio.h> 49#include <sys/endian.h> 50#include <sys/errno.h> 51#include <sys/bus.h> 52#include <sys/proc.h> 53#include <sys/sysctl.h> 54 55#include <machine/atomic.h> 56 57#include <net/if.h> 58#include <net/if_dl.h> 59#include <net/if_media.h> 60#include <net/if_arp.h> 61#include <net/ethernet.h> 62#include <net/if_llc.h> 63 64#include <net80211/ieee80211_var.h> 65 66#include <net/bpf.h> 67 68#ifdef INET 69#include <netinet/in.h> 70#include <netinet/if_ether.h> 71#endif 72 73#ifdef IEEE80211_DEBUG 74int ieee80211_debug = 0; 75SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 76 0, "IEEE 802.11 media debugging printfs"); 77#endif 78 79static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 80 enum ieee80211_phymode); 81 82static const char *ieee80211_phymode_name[] = { 83 "auto", /* IEEE80211_MODE_AUTO */ 84 "11a", /* IEEE80211_MODE_11A */ 85 "11b", /* IEEE80211_MODE_11B */ 86 "11g", /* IEEE80211_MODE_11G */ 87 "turbo", /* IEEE80211_MODE_TURBO */ 88}; 89 90void 91ieee80211_ifattach(struct ifnet *ifp) 92{ 93 struct ieee80211com *ic = (void *)ifp; 94 struct ieee80211_channel *c; 95 int i; 96 97 ether_ifattach(ifp, ic->ic_myaddr); 98 bpfattach2(ifp, DLT_IEEE802_11, 99 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 100 ieee80211_crypto_attach(ifp); 101 102 /* 103 * Fill in 802.11 available channel set, mark 104 * all available channels as active, and pick 105 * a default channel if not already specified. 106 */ 107 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 108 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 109 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 110 c = &ic->ic_channels[i]; 111 if (c->ic_flags) { 112 /* 113 * Verify driver passed us valid data. 114 */ 115 if (i != ieee80211_chan2ieee(ic, c)) { 116 if_printf(ifp, "bad channel ignored; " 117 "freq %u flags %x number %u\n", 118 c->ic_freq, c->ic_flags, i); 119 c->ic_flags = 0; /* NB: remove */ 120 continue; 121 } 122 setbit(ic->ic_chan_avail, i); 123 /* 124 * Identify mode capabilities. 125 */ 126 if (IEEE80211_IS_CHAN_A(c)) 127 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 128 if (IEEE80211_IS_CHAN_B(c)) 129 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 130 if (IEEE80211_IS_CHAN_PUREG(c)) 131 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 132 if (IEEE80211_IS_CHAN_T(c)) 133 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 134 } 135 } 136 /* validate ic->ic_curmode */ 137 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 138 ic->ic_curmode = IEEE80211_MODE_AUTO; 139 140 (void) ieee80211_setmode(ic, ic->ic_curmode); 141 142 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 143 if (ic->ic_lintval == 0) 144 ic->ic_lintval = 100; /* default sleep */ 145 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 146 147 ieee80211_node_attach(ifp); 148 ieee80211_proto_attach(ifp); 149} 150 151void 152ieee80211_ifdetach(struct ifnet *ifp) 153{ 154 struct ieee80211com *ic = (void *)ifp; 155 156 ieee80211_proto_detach(ifp); 157 ieee80211_crypto_detach(ifp); 158 ieee80211_node_detach(ifp); 159 ifmedia_removeall(&ic->ic_media); 160 bpfdetach(ifp); 161 ether_ifdetach(ifp); 162} 163 164/* 165 * Convert MHz frequency to IEEE channel number. 166 */ 167u_int 168ieee80211_mhz2ieee(u_int freq, u_int flags) 169{ 170 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 171 if (freq == 2484) 172 return 14; 173 if (freq < 2484) 174 return (freq - 2407) / 5; 175 else 176 return 15 + ((freq - 2512) / 20); 177 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 178 return (freq - 5000) / 5; 179 } else { /* either, guess */ 180 if (freq == 2484) 181 return 14; 182 if (freq < 2484) 183 return (freq - 2407) / 5; 184 if (freq < 5000) 185 return 15 + ((freq - 2512) / 20); 186 return (freq - 5000) / 5; 187 } 188} 189 190/* 191 * Convert channel to IEEE channel number. 192 */ 193u_int 194ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 195{ 196 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 197 return c - ic->ic_channels; 198 else if (c == IEEE80211_CHAN_ANYC) 199 return IEEE80211_CHAN_ANY; 200 else if (c != NULL) { 201 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 202 c->ic_freq, c->ic_flags); 203 return 0; /* XXX */ 204 } else { 205 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 206 return 0; /* XXX */ 207 } 208} 209 210/* 211 * Convert IEEE channel number to MHz frequency. 212 */ 213u_int 214ieee80211_ieee2mhz(u_int chan, u_int flags) 215{ 216 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 217 if (chan == 14) 218 return 2484; 219 if (chan < 14) 220 return 2407 + chan*5; 221 else 222 return 2512 + ((chan-15)*20); 223 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 224 return 5000 + (chan*5); 225 } else { /* either, guess */ 226 if (chan == 14) 227 return 2484; 228 if (chan < 14) /* 0-13 */ 229 return 2407 + chan*5; 230 if (chan < 27) /* 15-26 */ 231 return 2512 + ((chan-15)*20); 232 return 5000 + (chan*5); 233 } 234} 235 236/* 237 * Setup the media data structures according to the channel and 238 * rate tables. This must be called by the driver after 239 * ieee80211_attach and before most anything else. 240 */ 241void 242ieee80211_media_init(struct ifnet *ifp, 243 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 244{ 245#define ADD(_ic, _s, _o) \ 246 ifmedia_add(&(_ic)->ic_media, \ 247 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 248 struct ieee80211com *ic = (void *)ifp; 249 struct ifmediareq imr; 250 int i, j, mode, rate, maxrate, mword, mopt, r; 251 struct ieee80211_rateset *rs; 252 struct ieee80211_rateset allrates; 253 254 /* 255 * Do late attach work that must wait for any subclass 256 * (i.e. driver) work such as overriding methods. 257 */ 258 ieee80211_node_lateattach(ifp); 259 260 /* 261 * Fill in media characteristics. 262 */ 263 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 264 maxrate = 0; 265 memset(&allrates, 0, sizeof(allrates)); 266 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 267 static const u_int mopts[] = { 268 IFM_AUTO, 269 IFM_MAKEMODE(IFM_IEEE80211_11A), 270 IFM_MAKEMODE(IFM_IEEE80211_11B), 271 IFM_MAKEMODE(IFM_IEEE80211_11G), 272 IFM_MAKEMODE(IFM_IEEE80211_11A) | IFM_IEEE80211_TURBO, 273 }; 274 if ((ic->ic_modecaps & (1<<mode)) == 0) 275 continue; 276 mopt = mopts[mode]; 277 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 278 if (ic->ic_caps & IEEE80211_C_IBSS) 279 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 280 if (ic->ic_caps & IEEE80211_C_HOSTAP) 281 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 282 if (ic->ic_caps & IEEE80211_C_AHDEMO) 283 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 284 if (ic->ic_caps & IEEE80211_C_MONITOR) 285 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 286 if (mode == IEEE80211_MODE_AUTO) 287 continue; 288 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 289 rs = &ic->ic_sup_rates[mode]; 290 for (i = 0; i < rs->rs_nrates; i++) { 291 rate = rs->rs_rates[i]; 292 mword = ieee80211_rate2media(ic, rate, mode); 293 if (mword == 0) 294 continue; 295 printf("%s%d%sMbps", (i != 0 ? " " : ""), 296 (rate & IEEE80211_RATE_VAL) / 2, 297 ((rate & 0x1) != 0 ? ".5" : "")); 298 ADD(ic, mword, mopt); 299 if (ic->ic_caps & IEEE80211_C_IBSS) 300 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 301 if (ic->ic_caps & IEEE80211_C_HOSTAP) 302 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 303 if (ic->ic_caps & IEEE80211_C_AHDEMO) 304 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 305 if (ic->ic_caps & IEEE80211_C_MONITOR) 306 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 307 /* 308 * Add rate to the collection of all rates. 309 */ 310 r = rate & IEEE80211_RATE_VAL; 311 for (j = 0; j < allrates.rs_nrates; j++) 312 if (allrates.rs_rates[j] == r) 313 break; 314 if (j == allrates.rs_nrates) { 315 /* unique, add to the set */ 316 allrates.rs_rates[j] = r; 317 allrates.rs_nrates++; 318 } 319 rate = (rate & IEEE80211_RATE_VAL) / 2; 320 if (rate > maxrate) 321 maxrate = rate; 322 } 323 printf("\n"); 324 } 325 for (i = 0; i < allrates.rs_nrates; i++) { 326 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 327 IEEE80211_MODE_AUTO); 328 if (mword == 0) 329 continue; 330 mword = IFM_SUBTYPE(mword); /* remove media options */ 331 ADD(ic, mword, 0); 332 if (ic->ic_caps & IEEE80211_C_IBSS) 333 ADD(ic, mword, IFM_IEEE80211_ADHOC); 334 if (ic->ic_caps & IEEE80211_C_HOSTAP) 335 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 336 if (ic->ic_caps & IEEE80211_C_AHDEMO) 337 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 338 if (ic->ic_caps & IEEE80211_C_MONITOR) 339 ADD(ic, mword, IFM_IEEE80211_MONITOR); 340 } 341 ieee80211_media_status(ifp, &imr); 342 ifmedia_set(&ic->ic_media, imr.ifm_active); 343 344 if (maxrate) 345 ifp->if_baudrate = IF_Mbps(maxrate); 346#undef ADD 347} 348 349static int 350findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 351{ 352#define IEEERATE(_ic,_m,_i) \ 353 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 354 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 355 for (i = 0; i < nrates; i++) 356 if (IEEERATE(ic, mode, i) == rate) 357 return i; 358 return -1; 359#undef IEEERATE 360} 361 362/* 363 * Handle a media change request. 364 */ 365int 366ieee80211_media_change(struct ifnet *ifp) 367{ 368 struct ieee80211com *ic = (void *)ifp; 369 struct ifmedia_entry *ime; 370 enum ieee80211_opmode newopmode; 371 enum ieee80211_phymode newphymode; 372 int i, j, newrate, error = 0; 373 374 ime = ic->ic_media.ifm_cur; 375 /* 376 * First, identify the phy mode. 377 */ 378 switch (IFM_MODE(ime->ifm_media)) { 379 case IFM_IEEE80211_11A: 380 newphymode = IEEE80211_MODE_11A; 381 break; 382 case IFM_IEEE80211_11B: 383 newphymode = IEEE80211_MODE_11B; 384 break; 385 case IFM_IEEE80211_11G: 386 newphymode = IEEE80211_MODE_11G; 387 break; 388 case IFM_AUTO: 389 newphymode = IEEE80211_MODE_AUTO; 390 break; 391 default: 392 return EINVAL; 393 } 394 /* 395 * Turbo mode is an ``option''. Eventually it 396 * needs to be applied to 11g too. 397 */ 398 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 399 if (newphymode != IEEE80211_MODE_11A) 400 return EINVAL; 401 newphymode = IEEE80211_MODE_TURBO; 402 } 403 /* 404 * Validate requested mode is available. 405 */ 406 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 407 return EINVAL; 408 409 /* 410 * Next, the fixed/variable rate. 411 */ 412 i = -1; 413 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 414 /* 415 * Convert media subtype to rate. 416 */ 417 newrate = ieee80211_media2rate(ime->ifm_media); 418 if (newrate == 0) 419 return EINVAL; 420 /* 421 * Check the rate table for the specified/current phy. 422 */ 423 if (newphymode == IEEE80211_MODE_AUTO) { 424 /* 425 * In autoselect mode search for the rate. 426 */ 427 for (j = IEEE80211_MODE_11A; 428 j < IEEE80211_MODE_MAX; j++) { 429 if ((ic->ic_modecaps & (1<<j)) == 0) 430 continue; 431 i = findrate(ic, j, newrate); 432 if (i != -1) { 433 /* lock mode too */ 434 newphymode = j; 435 break; 436 } 437 } 438 } else { 439 i = findrate(ic, newphymode, newrate); 440 } 441 if (i == -1) /* mode/rate mismatch */ 442 return EINVAL; 443 } 444 /* NB: defer rate setting to later */ 445 446 /* 447 * Deduce new operating mode but don't install it just yet. 448 */ 449 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 450 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 451 newopmode = IEEE80211_M_AHDEMO; 452 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 453 newopmode = IEEE80211_M_HOSTAP; 454 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 455 newopmode = IEEE80211_M_IBSS; 456 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 457 newopmode = IEEE80211_M_MONITOR; 458 else 459 newopmode = IEEE80211_M_STA; 460 461 /* 462 * Autoselect doesn't make sense when operating as an AP. 463 * If no phy mode has been selected, pick one and lock it 464 * down so rate tables can be used in forming beacon frames 465 * and the like. 466 */ 467 if (newopmode == IEEE80211_M_HOSTAP && 468 newphymode == IEEE80211_MODE_AUTO) { 469 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 470 if (ic->ic_modecaps & (1<<j)) { 471 newphymode = j; 472 break; 473 } 474 } 475 476 /* 477 * Handle phy mode change. 478 */ 479 if (ic->ic_curmode != newphymode) { /* change phy mode */ 480 error = ieee80211_setmode(ic, newphymode); 481 if (error != 0) 482 return error; 483 error = ENETRESET; 484 } 485 486 /* 487 * Committed to changes, install the rate setting. 488 */ 489 if (ic->ic_fixed_rate != i) { 490 ic->ic_fixed_rate = i; /* set fixed tx rate */ 491 error = ENETRESET; 492 } 493 494 /* 495 * Handle operating mode change. 496 */ 497 if (ic->ic_opmode != newopmode) { 498 ic->ic_opmode = newopmode; 499 switch (newopmode) { 500 case IEEE80211_M_AHDEMO: 501 case IEEE80211_M_HOSTAP: 502 case IEEE80211_M_STA: 503 case IEEE80211_M_MONITOR: 504 ic->ic_flags &= ~IEEE80211_F_IBSSON; 505 break; 506 case IEEE80211_M_IBSS: 507 ic->ic_flags |= IEEE80211_F_IBSSON; 508#ifdef notdef 509 if (ic->ic_curmode == IEEE80211_MODE_11G) 510 ieee80211_set11gbasicrates( 511 &ic->ic_suprates[newphymode], 512 IEEE80211_MODE_11B); 513#endif 514 break; 515 } 516 error = ENETRESET; 517 } 518#ifdef notdef 519 if (error == 0) 520 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 521#endif 522 return error; 523} 524 525void 526ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 527{ 528 struct ieee80211com *ic = (void *)ifp; 529 struct ieee80211_node *ni = NULL; 530 531 imr->ifm_status = IFM_AVALID; 532 imr->ifm_active = IFM_IEEE80211; 533 if (ic->ic_state == IEEE80211_S_RUN) 534 imr->ifm_status |= IFM_ACTIVE; 535 imr->ifm_active |= IFM_AUTO; 536 switch (ic->ic_opmode) { 537 case IEEE80211_M_STA: 538 ni = ic->ic_bss; 539 /* calculate rate subtype */ 540 imr->ifm_active |= ieee80211_rate2media(ic, 541 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 542 break; 543 case IEEE80211_M_IBSS: 544 imr->ifm_active |= IFM_IEEE80211_ADHOC; 545 break; 546 case IEEE80211_M_AHDEMO: 547 /* should not come here */ 548 break; 549 case IEEE80211_M_HOSTAP: 550 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 551 break; 552 case IEEE80211_M_MONITOR: 553 imr->ifm_active |= IFM_IEEE80211_MONITOR; 554 break; 555 } 556 switch (ic->ic_curmode) { 557 case IEEE80211_MODE_11A: 558 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A); 559 break; 560 case IEEE80211_MODE_11B: 561 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11B); 562 break; 563 case IEEE80211_MODE_11G: 564 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11G); 565 break; 566 case IEEE80211_MODE_TURBO: 567 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A) 568 | IFM_IEEE80211_TURBO; 569 break; 570 } 571} 572 573void 574ieee80211_watchdog(struct ifnet *ifp) 575{ 576 struct ieee80211com *ic = (void *)ifp; 577 578 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 579 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 580 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 581 ieee80211_timeout_nodes(ic); 582 583 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 584 ifp->if_timer = 1; 585} 586 587/* 588 * Mark the basic rates for the 11g rate table based on the 589 * operating mode. For real 11g we mark all the 11b rates 590 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 591 * 11b rates. There's also a pseudo 11a-mode used to mark only 592 * the basic OFDM rates. 593 */ 594static void 595ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 596{ 597 static const struct ieee80211_rateset basic[] = { 598 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 599 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 600 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 601 { 0 }, /* IEEE80211_MODE_TURBO */ 602 }; 603 int i, j; 604 605 for (i = 0; i < rs->rs_nrates; i++) { 606 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 607 for (j = 0; j < basic[mode].rs_nrates; j++) 608 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 609 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 610 break; 611 } 612 } 613} 614 615/* 616 * Set the current phy mode and recalculate the active channel 617 * set based on the available channels for this mode. Also 618 * select a new default/current channel if the current one is 619 * inappropriate for this mode. 620 */ 621int 622ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 623{ 624#define N(a) (sizeof(a) / sizeof(a[0])) 625 static const u_int chanflags[] = { 626 0, /* IEEE80211_MODE_AUTO */ 627 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 628 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 629 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 630 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 631 }; 632 struct ieee80211_channel *c; 633 u_int modeflags; 634 int i; 635 636 /* validate new mode */ 637 if ((ic->ic_modecaps & (1<<mode)) == 0) { 638 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 639 __func__, mode, ic->ic_modecaps)); 640 return EINVAL; 641 } 642 643 /* 644 * Verify at least one channel is present in the available 645 * channel list before committing to the new mode. 646 */ 647 KASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode)); 648 modeflags = chanflags[mode]; 649 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 650 c = &ic->ic_channels[i]; 651 if (mode == IEEE80211_MODE_AUTO) { 652 /* ignore turbo channels for autoselect */ 653 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 654 break; 655 } else { 656 if ((c->ic_flags & modeflags) == modeflags) 657 break; 658 } 659 } 660 if (i > IEEE80211_CHAN_MAX) { 661 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 662 __func__, mode)); 663 return EINVAL; 664 } 665 666 /* 667 * Calculate the active channel set. 668 */ 669 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 670 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 671 c = &ic->ic_channels[i]; 672 if (mode == IEEE80211_MODE_AUTO) { 673 /* take anything but pure turbo channels */ 674 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 675 setbit(ic->ic_chan_active, i); 676 } else { 677 if ((c->ic_flags & modeflags) == modeflags) 678 setbit(ic->ic_chan_active, i); 679 } 680 } 681 /* 682 * If no current/default channel is setup or the current 683 * channel is wrong for the mode then pick the first 684 * available channel from the active list. This is likely 685 * not the right one. 686 */ 687 if (ic->ic_ibss_chan == NULL || 688 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 689 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 690 if (isset(ic->ic_chan_active, i)) { 691 ic->ic_ibss_chan = &ic->ic_channels[i]; 692 break; 693 } 694 } 695 696 /* 697 * Set/reset state flags that influence beacon contents, etc. 698 * 699 * XXX what if we have stations already associated??? 700 * XXX probably not right for autoselect? 701 */ 702 if (mode == IEEE80211_MODE_11G) { 703 if (ic->ic_caps & IEEE80211_C_SHSLOT) 704 ic->ic_flags |= IEEE80211_F_SHSLOT; 705 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 706 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 707 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 708 IEEE80211_MODE_11G); 709 } else { 710 ic->ic_flags &= ~(IEEE80211_F_SHSLOT | IEEE80211_F_SHPREAMBLE); 711 } 712 713 ic->ic_curmode = mode; 714 return 0; 715#undef N 716} 717 718/* 719 * Return the phy mode for with the specified channel so the 720 * caller can select a rate set. This is problematic and the 721 * work here assumes how things work elsewhere in this code. 722 */ 723enum ieee80211_phymode 724ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 725{ 726 /* 727 * NB: this assumes the channel would not be supplied to us 728 * unless it was already compatible with the current mode. 729 */ 730 if (ic->ic_curmode != IEEE80211_MODE_AUTO) 731 return ic->ic_curmode; 732 /* 733 * In autoselect mode; deduce a mode based on the channel 734 * characteristics. We assume that turbo-only channels 735 * are not considered when the channel set is constructed. 736 */ 737 if (IEEE80211_IS_CHAN_5GHZ(chan)) 738 return IEEE80211_MODE_11A; 739 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 740 return IEEE80211_MODE_11G; 741 else 742 return IEEE80211_MODE_11B; 743} 744 745/* 746 * convert IEEE80211 rate value to ifmedia subtype. 747 * ieee80211 rate is in unit of 0.5Mbps. 748 */ 749int 750ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 751{ 752#define N(a) (sizeof(a) / sizeof(a[0])) 753 static const struct { 754 u_int m; /* rate + mode */ 755 u_int r; /* if_media rate */ 756 } rates[] = { 757 { 2 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS1 }, 758 { 4 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS2 }, 759 { 11 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS5 }, 760 { 22 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS11 }, 761 { 44 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS22 }, 762 { 12 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM6 }, 763 { 18 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM9 }, 764 { 24 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM12 }, 765 { 36 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM18 }, 766 { 48 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM24 }, 767 { 72 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM36 }, 768 { 96 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM48 }, 769 { 108 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM54 }, 770 { 2 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS1 }, 771 { 4 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS2 }, 772 { 11 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS5 }, 773 { 22 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS11 }, 774 { 12 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM6 }, 775 { 18 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM9 }, 776 { 24 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM12 }, 777 { 36 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM18 }, 778 { 48 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM24 }, 779 { 72 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM36 }, 780 { 96 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM48 }, 781 { 108 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM54 }, 782 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 783 }; 784 u_int mask, i; 785 786 mask = rate & IEEE80211_RATE_VAL; 787 switch (mode) { 788 case IEEE80211_MODE_11A: 789 case IEEE80211_MODE_TURBO: 790 mask |= IFM_MAKEMODE(IFM_IEEE80211_11A); 791 break; 792 case IEEE80211_MODE_11B: 793 mask |= IFM_MAKEMODE(IFM_IEEE80211_11B); 794 break; 795 case IEEE80211_MODE_AUTO: 796 /* NB: ic may be NULL for some drivers */ 797 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 798 /* must handle these specially */ 799 switch (mask) { 800 case 2: return IFM_IEEE80211_FH1; 801 case 4: return IFM_IEEE80211_FH2; 802 } 803 return IFM_AUTO; 804 } 805 /* NB: hack, 11g matches both 11b+11a rates */ 806 /* fall thru... */ 807 case IEEE80211_MODE_11G: 808 mask |= IFM_MAKEMODE(IFM_IEEE80211_11G); 809 break; 810 } 811 for (i = 0; i < N(rates); i++) 812 if (rates[i].m == mask) 813 return rates[i].r; 814 return IFM_AUTO; 815#undef N 816} 817 818int 819ieee80211_media2rate(int mword) 820{ 821#define N(a) (sizeof(a) / sizeof(a[0])) 822 static const int ieeerates[] = { 823 -1, /* IFM_AUTO */ 824 0, /* IFM_MANUAL */ 825 0, /* IFM_NONE */ 826 2, /* IFM_IEEE80211_FH1 */ 827 4, /* IFM_IEEE80211_FH2 */ 828 2, /* IFM_IEEE80211_DS1 */ 829 4, /* IFM_IEEE80211_DS2 */ 830 11, /* IFM_IEEE80211_DS5 */ 831 22, /* IFM_IEEE80211_DS11 */ 832 44, /* IFM_IEEE80211_DS22 */ 833 12, /* IFM_IEEE80211_OFDM6 */ 834 18, /* IFM_IEEE80211_OFDM9 */ 835 24, /* IFM_IEEE80211_OFDM12 */ 836 36, /* IFM_IEEE80211_OFDM18 */ 837 48, /* IFM_IEEE80211_OFDM24 */ 838 72, /* IFM_IEEE80211_OFDM36 */ 839 96, /* IFM_IEEE80211_OFDM48 */ 840 108, /* IFM_IEEE80211_OFDM54 */ 841 144, /* IFM_IEEE80211_OFDM72 */ 842 }; 843 return IFM_SUBTYPE(mword) < N(ieeerates) ? 844 ieeerates[IFM_SUBTYPE(mword)] : 0; 845#undef N 846} 847 848/* 849 * Module glue. 850 * 851 * NB: the module name is "wlan" for compatibility with NetBSD. 852 */ 853 854static int 855ieee80211_modevent(module_t mod, int type, void *unused) 856{ 857 switch (type) { 858 case MOD_LOAD: 859 if (bootverbose) 860 printf("wlan: <802.11 Link Layer>\n"); 861 return 0; 862 case MOD_UNLOAD: 863 return 0; 864 } 865 return EINVAL; 866} 867 868static moduledata_t ieee80211_mod = { 869 "wlan", 870 ieee80211_modevent, 871 0 872}; 873DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 874MODULE_VERSION(wlan, 1); 875MODULE_DEPEND(wlan, rc4, 1, 1, 1); 876