ieee80211.c revision 1.2
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: src/sys/net80211/ieee80211.c,v 1.7 2003/08/13 22:09:44 sam Exp $"); 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 #ifdef __FreeBSD__ 56 #include <machine/atomic.h> 57 #endif 58 59 #include <net/if.h> 60 #include <net/if_dl.h> 61 #include <net/if_media.h> 62 #include <net/if_arp.h> 63 #ifdef __FreeBSD__ 64 #include <net/ethernet.h> 65 #endif 66 #include <net/if_llc.h> 67 68 #include <net80211/ieee80211_var.h> 69 70 #include <net/bpf.h> 71 72 #ifdef INET 73 #include <netinet/in.h> 74 #include <netinet/if_ether.h> 75 #endif 76 77 #ifdef IEEE80211_DEBUG 78 int ieee80211_debug = 0; 79 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 80 0, "IEEE 802.11 media debugging printfs"); 81 #endif 82 83 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 84 enum ieee80211_phymode); 85 86 static const char *ieee80211_phymode_name[] = { 87 "auto", /* IEEE80211_MODE_AUTO */ 88 "11a", /* IEEE80211_MODE_11A */ 89 "11b", /* IEEE80211_MODE_11B */ 90 "11g", /* IEEE80211_MODE_11G */ 91 "turbo", /* IEEE80211_MODE_TURBO */ 92 }; 93 94 void 95 ieee80211_ifattach(struct ifnet *ifp) 96 { 97 struct ieee80211com *ic = (void *)ifp; 98 struct ieee80211_channel *c; 99 int i; 100 101 ether_ifattach(ifp, ic->ic_myaddr); 102 bpfattach2(ifp, DLT_IEEE802_11, 103 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 104 ieee80211_crypto_attach(ifp); 105 106 /* 107 * Fill in 802.11 available channel set, mark 108 * all available channels as active, and pick 109 * a default channel if not already specified. 110 */ 111 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 112 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 113 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 114 c = &ic->ic_channels[i]; 115 if (c->ic_flags) { 116 /* 117 * Verify driver passed us valid data. 118 */ 119 if (i != ieee80211_chan2ieee(ic, c)) { 120 if_printf(ifp, "bad channel ignored; " 121 "freq %u flags %x number %u\n", 122 c->ic_freq, c->ic_flags, i); 123 c->ic_flags = 0; /* NB: remove */ 124 continue; 125 } 126 setbit(ic->ic_chan_avail, i); 127 /* 128 * Identify mode capabilities. 129 */ 130 if (IEEE80211_IS_CHAN_A(c)) 131 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 132 if (IEEE80211_IS_CHAN_B(c)) 133 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 134 if (IEEE80211_IS_CHAN_PUREG(c)) 135 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 136 if (IEEE80211_IS_CHAN_T(c)) 137 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 138 } 139 } 140 /* validate ic->ic_curmode */ 141 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 142 ic->ic_curmode = IEEE80211_MODE_AUTO; 143 144 (void) ieee80211_setmode(ic, ic->ic_curmode); 145 146 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 147 if (ic->ic_lintval == 0) 148 ic->ic_lintval = 100; /* default sleep */ 149 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 150 151 ieee80211_node_attach(ifp); 152 ieee80211_proto_attach(ifp); 153 } 154 155 void 156 ieee80211_ifdetach(struct ifnet *ifp) 157 { 158 struct ieee80211com *ic = (void *)ifp; 159 160 ieee80211_proto_detach(ifp); 161 ieee80211_crypto_detach(ifp); 162 ieee80211_node_detach(ifp); 163 ifmedia_removeall(&ic->ic_media); 164 bpfdetach(ifp); 165 ether_ifdetach(ifp); 166 } 167 168 /* 169 * Convert MHz frequency to IEEE channel number. 170 */ 171 u_int 172 ieee80211_mhz2ieee(u_int freq, u_int flags) 173 { 174 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 175 if (freq == 2484) 176 return 14; 177 if (freq < 2484) 178 return (freq - 2407) / 5; 179 else 180 return 15 + ((freq - 2512) / 20); 181 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 182 return (freq - 5000) / 5; 183 } else { /* either, guess */ 184 if (freq == 2484) 185 return 14; 186 if (freq < 2484) 187 return (freq - 2407) / 5; 188 if (freq < 5000) 189 return 15 + ((freq - 2512) / 20); 190 return (freq - 5000) / 5; 191 } 192 } 193 194 /* 195 * Convert channel to IEEE channel number. 196 */ 197 u_int 198 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 199 { 200 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 201 return c - ic->ic_channels; 202 else if (c == IEEE80211_CHAN_ANYC) 203 return IEEE80211_CHAN_ANY; 204 else if (c != NULL) { 205 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 206 c->ic_freq, c->ic_flags); 207 return 0; /* XXX */ 208 } else { 209 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 210 return 0; /* XXX */ 211 } 212 } 213 214 /* 215 * Convert IEEE channel number to MHz frequency. 216 */ 217 u_int 218 ieee80211_ieee2mhz(u_int chan, u_int flags) 219 { 220 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 221 if (chan == 14) 222 return 2484; 223 if (chan < 14) 224 return 2407 + chan*5; 225 else 226 return 2512 + ((chan-15)*20); 227 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 228 return 5000 + (chan*5); 229 } else { /* either, guess */ 230 if (chan == 14) 231 return 2484; 232 if (chan < 14) /* 0-13 */ 233 return 2407 + chan*5; 234 if (chan < 27) /* 15-26 */ 235 return 2512 + ((chan-15)*20); 236 return 5000 + (chan*5); 237 } 238 } 239 240 /* 241 * Setup the media data structures according to the channel and 242 * rate tables. This must be called by the driver after 243 * ieee80211_attach and before most anything else. 244 */ 245 void 246 ieee80211_media_init(struct ifnet *ifp, 247 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 248 { 249 #define ADD(_ic, _s, _o) \ 250 ifmedia_add(&(_ic)->ic_media, \ 251 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 252 struct ieee80211com *ic = (void *)ifp; 253 struct ifmediareq imr; 254 int i, j, mode, rate, maxrate, mword, mopt, r; 255 struct ieee80211_rateset *rs; 256 struct ieee80211_rateset allrates; 257 258 /* 259 * Do late attach work that must wait for any subclass 260 * (i.e. driver) work such as overriding methods. 261 */ 262 ieee80211_node_lateattach(ifp); 263 264 /* 265 * Fill in media characteristics. 266 */ 267 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 268 maxrate = 0; 269 memset(&allrates, 0, sizeof(allrates)); 270 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 271 static const u_int mopts[] = { 272 IFM_AUTO, 273 IFM_MAKEMODE(IFM_IEEE80211_11A), 274 IFM_MAKEMODE(IFM_IEEE80211_11B), 275 IFM_MAKEMODE(IFM_IEEE80211_11G), 276 IFM_MAKEMODE(IFM_IEEE80211_11A) | IFM_IEEE80211_TURBO, 277 }; 278 if ((ic->ic_modecaps & (1<<mode)) == 0) 279 continue; 280 mopt = mopts[mode]; 281 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 282 if (ic->ic_caps & IEEE80211_C_IBSS) 283 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 284 if (ic->ic_caps & IEEE80211_C_HOSTAP) 285 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 286 if (ic->ic_caps & IEEE80211_C_AHDEMO) 287 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 288 if (ic->ic_caps & IEEE80211_C_MONITOR) 289 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 290 if (mode == IEEE80211_MODE_AUTO) 291 continue; 292 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 293 rs = &ic->ic_sup_rates[mode]; 294 for (i = 0; i < rs->rs_nrates; i++) { 295 rate = rs->rs_rates[i]; 296 mword = ieee80211_rate2media(ic, rate, mode); 297 if (mword == 0) 298 continue; 299 printf("%s%d%sMbps", (i != 0 ? " " : ""), 300 (rate & IEEE80211_RATE_VAL) / 2, 301 ((rate & 0x1) != 0 ? ".5" : "")); 302 ADD(ic, mword, mopt); 303 if (ic->ic_caps & IEEE80211_C_IBSS) 304 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 305 if (ic->ic_caps & IEEE80211_C_HOSTAP) 306 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 307 if (ic->ic_caps & IEEE80211_C_AHDEMO) 308 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 309 if (ic->ic_caps & IEEE80211_C_MONITOR) 310 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 311 /* 312 * Add rate to the collection of all rates. 313 */ 314 r = rate & IEEE80211_RATE_VAL; 315 for (j = 0; j < allrates.rs_nrates; j++) 316 if (allrates.rs_rates[j] == r) 317 break; 318 if (j == allrates.rs_nrates) { 319 /* unique, add to the set */ 320 allrates.rs_rates[j] = r; 321 allrates.rs_nrates++; 322 } 323 rate = (rate & IEEE80211_RATE_VAL) / 2; 324 if (rate > maxrate) 325 maxrate = rate; 326 } 327 printf("\n"); 328 } 329 for (i = 0; i < allrates.rs_nrates; i++) { 330 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 331 IEEE80211_MODE_AUTO); 332 if (mword == 0) 333 continue; 334 mword = IFM_SUBTYPE(mword); /* remove media options */ 335 ADD(ic, mword, 0); 336 if (ic->ic_caps & IEEE80211_C_IBSS) 337 ADD(ic, mword, IFM_IEEE80211_ADHOC); 338 if (ic->ic_caps & IEEE80211_C_HOSTAP) 339 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 340 if (ic->ic_caps & IEEE80211_C_AHDEMO) 341 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 342 if (ic->ic_caps & IEEE80211_C_MONITOR) 343 ADD(ic, mword, IFM_IEEE80211_MONITOR); 344 } 345 ieee80211_media_status(ifp, &imr); 346 ifmedia_set(&ic->ic_media, imr.ifm_active); 347 348 if (maxrate) 349 ifp->if_baudrate = IF_Mbps(maxrate); 350 #undef ADD 351 } 352 353 static int 354 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 355 { 356 #define IEEERATE(_ic,_m,_i) \ 357 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 358 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 359 for (i = 0; i < nrates; i++) 360 if (IEEERATE(ic, mode, i) == rate) 361 return i; 362 return -1; 363 #undef IEEERATE 364 } 365 366 /* 367 * Handle a media change request. 368 */ 369 int 370 ieee80211_media_change(struct ifnet *ifp) 371 { 372 struct ieee80211com *ic = (void *)ifp; 373 struct ifmedia_entry *ime; 374 enum ieee80211_opmode newopmode; 375 enum ieee80211_phymode newphymode; 376 int i, j, newrate, error = 0; 377 378 ime = ic->ic_media.ifm_cur; 379 /* 380 * First, identify the phy mode. 381 */ 382 switch (IFM_MODE(ime->ifm_media)) { 383 case IFM_IEEE80211_11A: 384 newphymode = IEEE80211_MODE_11A; 385 break; 386 case IFM_IEEE80211_11B: 387 newphymode = IEEE80211_MODE_11B; 388 break; 389 case IFM_IEEE80211_11G: 390 newphymode = IEEE80211_MODE_11G; 391 break; 392 case IFM_AUTO: 393 newphymode = IEEE80211_MODE_AUTO; 394 break; 395 default: 396 return EINVAL; 397 } 398 /* 399 * Turbo mode is an ``option''. Eventually it 400 * needs to be applied to 11g too. 401 */ 402 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 403 if (newphymode != IEEE80211_MODE_11A) 404 return EINVAL; 405 newphymode = IEEE80211_MODE_TURBO; 406 } 407 /* 408 * Validate requested mode is available. 409 */ 410 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 411 return EINVAL; 412 413 /* 414 * Next, the fixed/variable rate. 415 */ 416 i = -1; 417 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 418 /* 419 * Convert media subtype to rate. 420 */ 421 newrate = ieee80211_media2rate(ime->ifm_media); 422 if (newrate == 0) 423 return EINVAL; 424 /* 425 * Check the rate table for the specified/current phy. 426 */ 427 if (newphymode == IEEE80211_MODE_AUTO) { 428 /* 429 * In autoselect mode search for the rate. 430 */ 431 for (j = IEEE80211_MODE_11A; 432 j < IEEE80211_MODE_MAX; j++) { 433 if ((ic->ic_modecaps & (1<<j)) == 0) 434 continue; 435 i = findrate(ic, j, newrate); 436 if (i != -1) { 437 /* lock mode too */ 438 newphymode = j; 439 break; 440 } 441 } 442 } else { 443 i = findrate(ic, newphymode, newrate); 444 } 445 if (i == -1) /* mode/rate mismatch */ 446 return EINVAL; 447 } 448 /* NB: defer rate setting to later */ 449 450 /* 451 * Deduce new operating mode but don't install it just yet. 452 */ 453 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 454 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 455 newopmode = IEEE80211_M_AHDEMO; 456 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 457 newopmode = IEEE80211_M_HOSTAP; 458 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 459 newopmode = IEEE80211_M_IBSS; 460 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 461 newopmode = IEEE80211_M_MONITOR; 462 else 463 newopmode = IEEE80211_M_STA; 464 465 /* 466 * Autoselect doesn't make sense when operating as an AP. 467 * If no phy mode has been selected, pick one and lock it 468 * down so rate tables can be used in forming beacon frames 469 * and the like. 470 */ 471 if (newopmode == IEEE80211_M_HOSTAP && 472 newphymode == IEEE80211_MODE_AUTO) { 473 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 474 if (ic->ic_modecaps & (1<<j)) { 475 newphymode = j; 476 break; 477 } 478 } 479 480 /* 481 * Handle phy mode change. 482 */ 483 if (ic->ic_curmode != newphymode) { /* change phy mode */ 484 error = ieee80211_setmode(ic, newphymode); 485 if (error != 0) 486 return error; 487 error = ENETRESET; 488 } 489 490 /* 491 * Committed to changes, install the rate setting. 492 */ 493 if (ic->ic_fixed_rate != i) { 494 ic->ic_fixed_rate = i; /* set fixed tx rate */ 495 error = ENETRESET; 496 } 497 498 /* 499 * Handle operating mode change. 500 */ 501 if (ic->ic_opmode != newopmode) { 502 ic->ic_opmode = newopmode; 503 switch (newopmode) { 504 case IEEE80211_M_AHDEMO: 505 case IEEE80211_M_HOSTAP: 506 case IEEE80211_M_STA: 507 case IEEE80211_M_MONITOR: 508 ic->ic_flags &= ~IEEE80211_F_IBSSON; 509 break; 510 case IEEE80211_M_IBSS: 511 ic->ic_flags |= IEEE80211_F_IBSSON; 512 #ifdef notdef 513 if (ic->ic_curmode == IEEE80211_MODE_11G) 514 ieee80211_set11gbasicrates( 515 &ic->ic_suprates[newphymode], 516 IEEE80211_MODE_11B); 517 #endif 518 break; 519 } 520 error = ENETRESET; 521 } 522 #ifdef notdef 523 if (error == 0) 524 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 525 #endif 526 return error; 527 } 528 529 void 530 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 531 { 532 struct ieee80211com *ic = (void *)ifp; 533 struct ieee80211_node *ni = NULL; 534 535 imr->ifm_status = IFM_AVALID; 536 imr->ifm_active = IFM_IEEE80211; 537 if (ic->ic_state == IEEE80211_S_RUN) 538 imr->ifm_status |= IFM_ACTIVE; 539 imr->ifm_active |= IFM_AUTO; 540 switch (ic->ic_opmode) { 541 case IEEE80211_M_STA: 542 ni = ic->ic_bss; 543 /* calculate rate subtype */ 544 imr->ifm_active |= ieee80211_rate2media(ic, 545 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 546 break; 547 case IEEE80211_M_IBSS: 548 imr->ifm_active |= IFM_IEEE80211_ADHOC; 549 break; 550 case IEEE80211_M_AHDEMO: 551 /* should not come here */ 552 break; 553 case IEEE80211_M_HOSTAP: 554 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 555 break; 556 case IEEE80211_M_MONITOR: 557 imr->ifm_active |= IFM_IEEE80211_MONITOR; 558 break; 559 } 560 switch (ic->ic_curmode) { 561 case IEEE80211_MODE_11A: 562 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A); 563 break; 564 case IEEE80211_MODE_11B: 565 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11B); 566 break; 567 case IEEE80211_MODE_11G: 568 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11G); 569 break; 570 case IEEE80211_MODE_TURBO: 571 imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A) 572 | IFM_IEEE80211_TURBO; 573 break; 574 } 575 } 576 577 void 578 ieee80211_watchdog(struct ifnet *ifp) 579 { 580 struct ieee80211com *ic = (void *)ifp; 581 582 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 583 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 584 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 585 ieee80211_timeout_nodes(ic); 586 587 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 588 ifp->if_timer = 1; 589 } 590 591 /* 592 * Mark the basic rates for the 11g rate table based on the 593 * operating mode. For real 11g we mark all the 11b rates 594 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 595 * 11b rates. There's also a pseudo 11a-mode used to mark only 596 * the basic OFDM rates. 597 */ 598 static void 599 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 600 { 601 static const struct ieee80211_rateset basic[] = { 602 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 603 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 604 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 605 { 0 }, /* IEEE80211_MODE_TURBO */ 606 }; 607 int i, j; 608 609 for (i = 0; i < rs->rs_nrates; i++) { 610 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 611 for (j = 0; j < basic[mode].rs_nrates; j++) 612 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 613 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 614 break; 615 } 616 } 617 } 618 619 /* 620 * Set the current phy mode and recalculate the active channel 621 * set based on the available channels for this mode. Also 622 * select a new default/current channel if the current one is 623 * inappropriate for this mode. 624 */ 625 int 626 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 627 { 628 #define N(a) (sizeof(a) / sizeof(a[0])) 629 static const u_int chanflags[] = { 630 0, /* IEEE80211_MODE_AUTO */ 631 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 632 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 633 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 634 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 635 }; 636 struct ieee80211_channel *c; 637 u_int modeflags; 638 int i; 639 640 /* validate new mode */ 641 if ((ic->ic_modecaps & (1<<mode)) == 0) { 642 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 643 __func__, mode, ic->ic_modecaps)); 644 return EINVAL; 645 } 646 647 /* 648 * Verify at least one channel is present in the available 649 * channel list before committing to the new mode. 650 */ 651 KASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode)); 652 modeflags = chanflags[mode]; 653 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 654 c = &ic->ic_channels[i]; 655 if (mode == IEEE80211_MODE_AUTO) { 656 /* ignore turbo channels for autoselect */ 657 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 658 break; 659 } else { 660 if ((c->ic_flags & modeflags) == modeflags) 661 break; 662 } 663 } 664 if (i > IEEE80211_CHAN_MAX) { 665 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 666 __func__, mode)); 667 return EINVAL; 668 } 669 670 /* 671 * Calculate the active channel set. 672 */ 673 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 674 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 675 c = &ic->ic_channels[i]; 676 if (mode == IEEE80211_MODE_AUTO) { 677 /* take anything but pure turbo channels */ 678 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 679 setbit(ic->ic_chan_active, i); 680 } else { 681 if ((c->ic_flags & modeflags) == modeflags) 682 setbit(ic->ic_chan_active, i); 683 } 684 } 685 /* 686 * If no current/default channel is setup or the current 687 * channel is wrong for the mode then pick the first 688 * available channel from the active list. This is likely 689 * not the right one. 690 */ 691 if (ic->ic_ibss_chan == NULL || 692 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 693 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 694 if (isset(ic->ic_chan_active, i)) { 695 ic->ic_ibss_chan = &ic->ic_channels[i]; 696 break; 697 } 698 } 699 700 /* 701 * Set/reset state flags that influence beacon contents, etc. 702 * 703 * XXX what if we have stations already associated??? 704 * XXX probably not right for autoselect? 705 */ 706 if (mode == IEEE80211_MODE_11G) { 707 if (ic->ic_caps & IEEE80211_C_SHSLOT) 708 ic->ic_flags |= IEEE80211_F_SHSLOT; 709 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 710 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 711 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 712 IEEE80211_MODE_11G); 713 } else { 714 ic->ic_flags &= ~(IEEE80211_F_SHSLOT | IEEE80211_F_SHPREAMBLE); 715 } 716 717 ic->ic_curmode = mode; 718 return 0; 719 #undef N 720 } 721 722 /* 723 * Return the phy mode for with the specified channel so the 724 * caller can select a rate set. This is problematic and the 725 * work here assumes how things work elsewhere in this code. 726 */ 727 enum ieee80211_phymode 728 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 729 { 730 /* 731 * NB: this assumes the channel would not be supplied to us 732 * unless it was already compatible with the current mode. 733 */ 734 if (ic->ic_curmode != IEEE80211_MODE_AUTO) 735 return ic->ic_curmode; 736 /* 737 * In autoselect mode; deduce a mode based on the channel 738 * characteristics. We assume that turbo-only channels 739 * are not considered when the channel set is constructed. 740 */ 741 if (IEEE80211_IS_CHAN_5GHZ(chan)) 742 return IEEE80211_MODE_11A; 743 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 744 return IEEE80211_MODE_11G; 745 else 746 return IEEE80211_MODE_11B; 747 } 748 749 /* 750 * convert IEEE80211 rate value to ifmedia subtype. 751 * ieee80211 rate is in unit of 0.5Mbps. 752 */ 753 int 754 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 755 { 756 #define N(a) (sizeof(a) / sizeof(a[0])) 757 static const struct { 758 u_int m; /* rate + mode */ 759 u_int r; /* if_media rate */ 760 } rates[] = { 761 { 2 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS1 }, 762 { 4 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS2 }, 763 { 11 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS5 }, 764 { 22 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS11 }, 765 { 44 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS22 }, 766 { 12 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM6 }, 767 { 18 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM9 }, 768 { 24 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM12 }, 769 { 36 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM18 }, 770 { 48 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM24 }, 771 { 72 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM36 }, 772 { 96 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM48 }, 773 { 108 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM54 }, 774 { 2 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS1 }, 775 { 4 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS2 }, 776 { 11 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS5 }, 777 { 22 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS11 }, 778 { 12 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM6 }, 779 { 18 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM9 }, 780 { 24 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM12 }, 781 { 36 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM18 }, 782 { 48 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM24 }, 783 { 72 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM36 }, 784 { 96 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM48 }, 785 { 108 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM54 }, 786 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 787 }; 788 u_int mask, i; 789 790 mask = rate & IEEE80211_RATE_VAL; 791 switch (mode) { 792 case IEEE80211_MODE_11A: 793 case IEEE80211_MODE_TURBO: 794 mask |= IFM_MAKEMODE(IFM_IEEE80211_11A); 795 break; 796 case IEEE80211_MODE_11B: 797 mask |= IFM_MAKEMODE(IFM_IEEE80211_11B); 798 break; 799 case IEEE80211_MODE_AUTO: 800 /* NB: ic may be NULL for some drivers */ 801 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 802 /* must handle these specially */ 803 switch (mask) { 804 case 2: return IFM_IEEE80211_FH1; 805 case 4: return IFM_IEEE80211_FH2; 806 } 807 return IFM_AUTO; 808 } 809 /* NB: hack, 11g matches both 11b+11a rates */ 810 /* fall thru... */ 811 case IEEE80211_MODE_11G: 812 mask |= IFM_MAKEMODE(IFM_IEEE80211_11G); 813 break; 814 } 815 for (i = 0; i < N(rates); i++) 816 if (rates[i].m == mask) 817 return rates[i].r; 818 return IFM_AUTO; 819 #undef N 820 } 821 822 int 823 ieee80211_media2rate(int mword) 824 { 825 #define N(a) (sizeof(a) / sizeof(a[0])) 826 static const int ieeerates[] = { 827 -1, /* IFM_AUTO */ 828 0, /* IFM_MANUAL */ 829 0, /* IFM_NONE */ 830 2, /* IFM_IEEE80211_FH1 */ 831 4, /* IFM_IEEE80211_FH2 */ 832 2, /* IFM_IEEE80211_DS1 */ 833 4, /* IFM_IEEE80211_DS2 */ 834 11, /* IFM_IEEE80211_DS5 */ 835 22, /* IFM_IEEE80211_DS11 */ 836 44, /* IFM_IEEE80211_DS22 */ 837 12, /* IFM_IEEE80211_OFDM6 */ 838 18, /* IFM_IEEE80211_OFDM9 */ 839 24, /* IFM_IEEE80211_OFDM12 */ 840 36, /* IFM_IEEE80211_OFDM18 */ 841 48, /* IFM_IEEE80211_OFDM24 */ 842 72, /* IFM_IEEE80211_OFDM36 */ 843 96, /* IFM_IEEE80211_OFDM48 */ 844 108, /* IFM_IEEE80211_OFDM54 */ 845 144, /* IFM_IEEE80211_OFDM72 */ 846 }; 847 return IFM_SUBTYPE(mword) < N(ieeerates) ? 848 ieeerates[IFM_SUBTYPE(mword)] : 0; 849 #undef N 850 } 851 852 #ifdef __FreeBSD__ 853 /* 854 * Module glue. 855 * 856 * NB: the module name is "wlan" for compatibility with NetBSD. 857 */ 858 859 static int 860 ieee80211_modevent(module_t mod, int type, void *unused) 861 { 862 switch (type) { 863 case MOD_LOAD: 864 if (bootverbose) 865 printf("wlan: <802.11 Link Layer>\n"); 866 return 0; 867 case MOD_UNLOAD: 868 return 0; 869 } 870 return EINVAL; 871 } 872 873 static moduledata_t ieee80211_mod = { 874 "wlan", 875 ieee80211_modevent, 876 0 877 }; 878 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 879 MODULE_VERSION(wlan, 1); 880 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 881 #endif 882
Indexes created Mon Sep 22 13:09:51 GMT 2025