ieee80211.c revision 1.1.1.3
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 1.11 2004/04/02 20:19:20 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 #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 74 int ieee80211_debug = 0; 75 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 76 0, "IEEE 802.11 media debugging printfs"); 77 #endif 78 79 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 80 enum ieee80211_phymode); 81 82 static 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 "FH", /* IEEE80211_MODE_FH */ 88 "turbo", /* IEEE80211_MODE_TURBO */ 89 }; 90 91 void 92 ieee80211_ifattach(struct ifnet *ifp) 93 { 94 struct ieee80211com *ic = (void *)ifp; 95 struct ieee80211_channel *c; 96 int i; 97 98 ether_ifattach(ifp, ic->ic_myaddr); 99 bpfattach2(ifp, DLT_IEEE802_11, 100 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 101 ieee80211_crypto_attach(ifp); 102 103 /* 104 * Fill in 802.11 available channel set, mark 105 * all available channels as active, and pick 106 * a default channel if not already specified. 107 */ 108 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 109 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 110 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 111 c = &ic->ic_channels[i]; 112 if (c->ic_flags) { 113 /* 114 * Verify driver passed us valid data. 115 */ 116 if (i != ieee80211_chan2ieee(ic, c)) { 117 if_printf(ifp, "bad channel ignored; " 118 "freq %u flags %x number %u\n", 119 c->ic_freq, c->ic_flags, i); 120 c->ic_flags = 0; /* NB: remove */ 121 continue; 122 } 123 setbit(ic->ic_chan_avail, i); 124 /* 125 * Identify mode capabilities. 126 */ 127 if (IEEE80211_IS_CHAN_A(c)) 128 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 129 if (IEEE80211_IS_CHAN_B(c)) 130 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 131 if (IEEE80211_IS_CHAN_PUREG(c)) 132 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 133 if (IEEE80211_IS_CHAN_FHSS(c)) 134 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 135 if (IEEE80211_IS_CHAN_T(c)) 136 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 137 } 138 } 139 /* validate ic->ic_curmode */ 140 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 141 ic->ic_curmode = IEEE80211_MODE_AUTO; 142 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 143 144 (void) ieee80211_setmode(ic, ic->ic_curmode); 145 146 if (ic->ic_lintval == 0) 147 ic->ic_lintval = 100; /* default sleep */ 148 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 149 150 ieee80211_node_attach(ifp); 151 ieee80211_proto_attach(ifp); 152 } 153 154 void 155 ieee80211_ifdetach(struct ifnet *ifp) 156 { 157 struct ieee80211com *ic = (void *)ifp; 158 159 ieee80211_proto_detach(ifp); 160 ieee80211_crypto_detach(ifp); 161 ieee80211_node_detach(ifp); 162 ifmedia_removeall(&ic->ic_media); 163 bpfdetach(ifp); 164 ether_ifdetach(ifp); 165 } 166 167 /* 168 * Convert MHz frequency to IEEE channel number. 169 */ 170 u_int 171 ieee80211_mhz2ieee(u_int freq, u_int flags) 172 { 173 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 174 if (freq == 2484) 175 return 14; 176 if (freq < 2484) 177 return (freq - 2407) / 5; 178 else 179 return 15 + ((freq - 2512) / 20); 180 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 181 return (freq - 5000) / 5; 182 } else { /* either, guess */ 183 if (freq == 2484) 184 return 14; 185 if (freq < 2484) 186 return (freq - 2407) / 5; 187 if (freq < 5000) 188 return 15 + ((freq - 2512) / 20); 189 return (freq - 5000) / 5; 190 } 191 } 192 193 /* 194 * Convert channel to IEEE channel number. 195 */ 196 u_int 197 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 198 { 199 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 200 return c - ic->ic_channels; 201 else if (c == IEEE80211_CHAN_ANYC) 202 return IEEE80211_CHAN_ANY; 203 else if (c != NULL) { 204 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 205 c->ic_freq, c->ic_flags); 206 return 0; /* XXX */ 207 } else { 208 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 209 return 0; /* XXX */ 210 } 211 } 212 213 /* 214 * Convert IEEE channel number to MHz frequency. 215 */ 216 u_int 217 ieee80211_ieee2mhz(u_int chan, u_int flags) 218 { 219 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 220 if (chan == 14) 221 return 2484; 222 if (chan < 14) 223 return 2407 + chan*5; 224 else 225 return 2512 + ((chan-15)*20); 226 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 227 return 5000 + (chan*5); 228 } else { /* either, guess */ 229 if (chan == 14) 230 return 2484; 231 if (chan < 14) /* 0-13 */ 232 return 2407 + chan*5; 233 if (chan < 27) /* 15-26 */ 234 return 2512 + ((chan-15)*20); 235 return 5000 + (chan*5); 236 } 237 } 238 239 /* 240 * Setup the media data structures according to the channel and 241 * rate tables. This must be called by the driver after 242 * ieee80211_attach and before most anything else. 243 */ 244 void 245 ieee80211_media_init(struct ifnet *ifp, 246 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 247 { 248 #define ADD(_ic, _s, _o) \ 249 ifmedia_add(&(_ic)->ic_media, \ 250 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 251 struct ieee80211com *ic = (void *)ifp; 252 struct ifmediareq imr; 253 int i, j, mode, rate, maxrate, mword, mopt, r; 254 struct ieee80211_rateset *rs; 255 struct ieee80211_rateset allrates; 256 257 /* 258 * Do late attach work that must wait for any subclass 259 * (i.e. driver) work such as overriding methods. 260 */ 261 ieee80211_node_lateattach(ifp); 262 263 /* 264 * Fill in media characteristics. 265 */ 266 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 267 maxrate = 0; 268 memset(&allrates, 0, sizeof(allrates)); 269 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 270 static const u_int mopts[] = { 271 IFM_AUTO, 272 IFM_IEEE80211_11A, 273 IFM_IEEE80211_11B, 274 IFM_IEEE80211_11G, 275 IFM_IEEE80211_FH, 276 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_IEEE80211_FH: 393 newphymode = IEEE80211_MODE_FH; 394 break; 395 case IFM_AUTO: 396 newphymode = IEEE80211_MODE_AUTO; 397 break; 398 default: 399 return EINVAL; 400 } 401 /* 402 * Turbo mode is an ``option''. Eventually it 403 * needs to be applied to 11g too. 404 */ 405 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 406 if (newphymode != IEEE80211_MODE_11A) 407 return EINVAL; 408 newphymode = IEEE80211_MODE_TURBO; 409 } 410 /* 411 * Validate requested mode is available. 412 */ 413 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 414 return EINVAL; 415 416 /* 417 * Next, the fixed/variable rate. 418 */ 419 i = -1; 420 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 421 /* 422 * Convert media subtype to rate. 423 */ 424 newrate = ieee80211_media2rate(ime->ifm_media); 425 if (newrate == 0) 426 return EINVAL; 427 /* 428 * Check the rate table for the specified/current phy. 429 */ 430 if (newphymode == IEEE80211_MODE_AUTO) { 431 /* 432 * In autoselect mode search for the rate. 433 */ 434 for (j = IEEE80211_MODE_11A; 435 j < IEEE80211_MODE_MAX; j++) { 436 if ((ic->ic_modecaps & (1<<j)) == 0) 437 continue; 438 i = findrate(ic, j, newrate); 439 if (i != -1) { 440 /* lock mode too */ 441 newphymode = j; 442 break; 443 } 444 } 445 } else { 446 i = findrate(ic, newphymode, newrate); 447 } 448 if (i == -1) /* mode/rate mismatch */ 449 return EINVAL; 450 } 451 /* NB: defer rate setting to later */ 452 453 /* 454 * Deduce new operating mode but don't install it just yet. 455 */ 456 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 457 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 458 newopmode = IEEE80211_M_AHDEMO; 459 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 460 newopmode = IEEE80211_M_HOSTAP; 461 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 462 newopmode = IEEE80211_M_IBSS; 463 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 464 newopmode = IEEE80211_M_MONITOR; 465 else 466 newopmode = IEEE80211_M_STA; 467 468 /* 469 * Autoselect doesn't make sense when operating as an AP. 470 * If no phy mode has been selected, pick one and lock it 471 * down so rate tables can be used in forming beacon frames 472 * and the like. 473 */ 474 if (newopmode == IEEE80211_M_HOSTAP && 475 newphymode == IEEE80211_MODE_AUTO) { 476 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 477 if (ic->ic_modecaps & (1<<j)) { 478 newphymode = j; 479 break; 480 } 481 } 482 483 /* 484 * Handle phy mode change. 485 */ 486 if (ic->ic_curmode != newphymode) { /* change phy mode */ 487 error = ieee80211_setmode(ic, newphymode); 488 if (error != 0) 489 return error; 490 error = ENETRESET; 491 } 492 493 /* 494 * Committed to changes, install the rate setting. 495 */ 496 if (ic->ic_fixed_rate != i) { 497 ic->ic_fixed_rate = i; /* set fixed tx rate */ 498 error = ENETRESET; 499 } 500 501 /* 502 * Handle operating mode change. 503 */ 504 if (ic->ic_opmode != newopmode) { 505 ic->ic_opmode = newopmode; 506 switch (newopmode) { 507 case IEEE80211_M_AHDEMO: 508 case IEEE80211_M_HOSTAP: 509 case IEEE80211_M_STA: 510 case IEEE80211_M_MONITOR: 511 ic->ic_flags &= ~IEEE80211_F_IBSSON; 512 break; 513 case IEEE80211_M_IBSS: 514 ic->ic_flags |= IEEE80211_F_IBSSON; 515 #ifdef notdef 516 if (ic->ic_curmode == IEEE80211_MODE_11G) 517 ieee80211_set11gbasicrates( 518 &ic->ic_suprates[newphymode], 519 IEEE80211_MODE_11B); 520 #endif 521 break; 522 } 523 error = ENETRESET; 524 } 525 #ifdef notdef 526 if (error == 0) 527 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 528 #endif 529 return error; 530 } 531 532 void 533 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 534 { 535 struct ieee80211com *ic = (void *)ifp; 536 struct ieee80211_node *ni = NULL; 537 538 imr->ifm_status = IFM_AVALID; 539 imr->ifm_active = IFM_IEEE80211; 540 if (ic->ic_state == IEEE80211_S_RUN) 541 imr->ifm_status |= IFM_ACTIVE; 542 imr->ifm_active |= IFM_AUTO; 543 switch (ic->ic_opmode) { 544 case IEEE80211_M_STA: 545 ni = ic->ic_bss; 546 /* calculate rate subtype */ 547 imr->ifm_active |= ieee80211_rate2media(ic, 548 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 549 break; 550 case IEEE80211_M_IBSS: 551 imr->ifm_active |= IFM_IEEE80211_ADHOC; 552 break; 553 case IEEE80211_M_AHDEMO: 554 /* should not come here */ 555 break; 556 case IEEE80211_M_HOSTAP: 557 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 558 break; 559 case IEEE80211_M_MONITOR: 560 imr->ifm_active |= IFM_IEEE80211_MONITOR; 561 break; 562 } 563 switch (ic->ic_curmode) { 564 case IEEE80211_MODE_11A: 565 imr->ifm_active |= IFM_IEEE80211_11A; 566 break; 567 case IEEE80211_MODE_11B: 568 imr->ifm_active |= IFM_IEEE80211_11B; 569 break; 570 case IEEE80211_MODE_11G: 571 imr->ifm_active |= IFM_IEEE80211_11G; 572 break; 573 case IEEE80211_MODE_FH: 574 imr->ifm_active |= IFM_IEEE80211_FH; 575 break; 576 case IEEE80211_MODE_TURBO: 577 imr->ifm_active |= IFM_IEEE80211_11A 578 | IFM_IEEE80211_TURBO; 579 break; 580 } 581 } 582 583 void 584 ieee80211_watchdog(struct ifnet *ifp) 585 { 586 struct ieee80211com *ic = (void *)ifp; 587 588 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 589 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 590 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 591 ieee80211_timeout_nodes(ic); 592 593 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 594 ifp->if_timer = 1; 595 } 596 597 /* 598 * Mark the basic rates for the 11g rate table based on the 599 * operating mode. For real 11g we mark all the 11b rates 600 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 601 * 11b rates. There's also a pseudo 11a-mode used to mark only 602 * the basic OFDM rates. 603 */ 604 static void 605 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 606 { 607 static const struct ieee80211_rateset basic[] = { 608 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 609 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 610 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 611 { 0 }, /* IEEE80211_MODE_FH */ 612 { 0 }, /* IEEE80211_MODE_TURBO */ 613 }; 614 int i, j; 615 616 for (i = 0; i < rs->rs_nrates; i++) { 617 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 618 for (j = 0; j < basic[mode].rs_nrates; j++) 619 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 620 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 621 break; 622 } 623 } 624 } 625 626 /* 627 * Set the current phy mode and recalculate the active channel 628 * set based on the available channels for this mode. Also 629 * select a new default/current channel if the current one is 630 * inappropriate for this mode. 631 */ 632 int 633 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 634 { 635 #define N(a) (sizeof(a) / sizeof(a[0])) 636 static const u_int chanflags[] = { 637 0, /* IEEE80211_MODE_AUTO */ 638 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 639 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 640 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 641 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 642 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 643 }; 644 struct ieee80211_channel *c; 645 u_int modeflags; 646 int i; 647 648 /* validate new mode */ 649 if ((ic->ic_modecaps & (1<<mode)) == 0) { 650 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 651 __func__, mode, ic->ic_modecaps)); 652 return EINVAL; 653 } 654 655 /* 656 * Verify at least one channel is present in the available 657 * channel list before committing to the new mode. 658 */ 659 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 660 modeflags = chanflags[mode]; 661 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 662 c = &ic->ic_channels[i]; 663 if (mode == IEEE80211_MODE_AUTO) { 664 /* ignore turbo channels for autoselect */ 665 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 666 break; 667 } else { 668 if ((c->ic_flags & modeflags) == modeflags) 669 break; 670 } 671 } 672 if (i > IEEE80211_CHAN_MAX) { 673 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 674 __func__, mode)); 675 return EINVAL; 676 } 677 678 /* 679 * Calculate the active channel set. 680 */ 681 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 682 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 683 c = &ic->ic_channels[i]; 684 if (mode == IEEE80211_MODE_AUTO) { 685 /* take anything but pure turbo channels */ 686 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 687 setbit(ic->ic_chan_active, i); 688 } else { 689 if ((c->ic_flags & modeflags) == modeflags) 690 setbit(ic->ic_chan_active, i); 691 } 692 } 693 /* 694 * If no current/default channel is setup or the current 695 * channel is wrong for the mode then pick the first 696 * available channel from the active list. This is likely 697 * not the right one. 698 */ 699 if (ic->ic_ibss_chan == NULL || 700 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 701 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 702 if (isset(ic->ic_chan_active, i)) { 703 ic->ic_ibss_chan = &ic->ic_channels[i]; 704 break; 705 } 706 } 707 708 /* 709 * Set/reset state flags that influence beacon contents, etc. 710 * 711 * XXX what if we have stations already associated??? 712 * XXX probably not right for autoselect? 713 */ 714 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 715 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 716 if (mode == IEEE80211_MODE_11G) { 717 if (ic->ic_caps & IEEE80211_C_SHSLOT) 718 ic->ic_flags |= IEEE80211_F_SHSLOT; 719 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 720 IEEE80211_MODE_11G); 721 } else { 722 ic->ic_flags &= ~IEEE80211_F_SHSLOT; 723 } 724 725 ic->ic_curmode = mode; 726 return 0; 727 #undef N 728 } 729 730 /* 731 * Return the phy mode for with the specified channel so the 732 * caller can select a rate set. This is problematic and the 733 * work here assumes how things work elsewhere in this code. 734 */ 735 enum ieee80211_phymode 736 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 737 { 738 /* 739 * NB: this assumes the channel would not be supplied to us 740 * unless it was already compatible with the current mode. 741 */ 742 if (ic->ic_curmode != IEEE80211_MODE_AUTO) 743 return ic->ic_curmode; 744 /* 745 * In autoselect mode; deduce a mode based on the channel 746 * characteristics. We assume that turbo-only channels 747 * are not considered when the channel set is constructed. 748 */ 749 if (IEEE80211_IS_CHAN_5GHZ(chan)) 750 return IEEE80211_MODE_11A; 751 else if (IEEE80211_IS_CHAN_FHSS(chan)) 752 return IEEE80211_MODE_FH; 753 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 754 return IEEE80211_MODE_11G; 755 else 756 return IEEE80211_MODE_11B; 757 } 758 759 /* 760 * convert IEEE80211 rate value to ifmedia subtype. 761 * ieee80211 rate is in unit of 0.5Mbps. 762 */ 763 int 764 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 765 { 766 #define N(a) (sizeof(a) / sizeof(a[0])) 767 static const struct { 768 u_int m; /* rate + mode */ 769 u_int r; /* if_media rate */ 770 } rates[] = { 771 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 772 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 773 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 774 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 775 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 776 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 777 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 778 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 779 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 780 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 781 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 782 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 783 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 784 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 785 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 786 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 787 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 788 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 789 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 790 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 791 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 792 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 793 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 794 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 795 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 796 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 797 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 798 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 799 }; 800 u_int mask, i; 801 802 mask = rate & IEEE80211_RATE_VAL; 803 switch (mode) { 804 case IEEE80211_MODE_11A: 805 case IEEE80211_MODE_TURBO: 806 mask |= IFM_IEEE80211_11A; 807 break; 808 case IEEE80211_MODE_11B: 809 mask |= IFM_IEEE80211_11B; 810 break; 811 case IEEE80211_MODE_FH: 812 mask |= IFM_IEEE80211_FH; 813 break; 814 case IEEE80211_MODE_AUTO: 815 /* NB: ic may be NULL for some drivers */ 816 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 817 mask |= IFM_IEEE80211_FH; 818 break; 819 } 820 /* NB: hack, 11g matches both 11b+11a rates */ 821 /* fall thru... */ 822 case IEEE80211_MODE_11G: 823 mask |= IFM_IEEE80211_11G; 824 break; 825 } 826 for (i = 0; i < N(rates); i++) 827 if (rates[i].m == mask) 828 return rates[i].r; 829 return IFM_AUTO; 830 #undef N 831 } 832 833 int 834 ieee80211_media2rate(int mword) 835 { 836 #define N(a) (sizeof(a) / sizeof(a[0])) 837 static const int ieeerates[] = { 838 -1, /* IFM_AUTO */ 839 0, /* IFM_MANUAL */ 840 0, /* IFM_NONE */ 841 2, /* IFM_IEEE80211_FH1 */ 842 4, /* IFM_IEEE80211_FH2 */ 843 2, /* IFM_IEEE80211_DS1 */ 844 4, /* IFM_IEEE80211_DS2 */ 845 11, /* IFM_IEEE80211_DS5 */ 846 22, /* IFM_IEEE80211_DS11 */ 847 44, /* IFM_IEEE80211_DS22 */ 848 12, /* IFM_IEEE80211_OFDM6 */ 849 18, /* IFM_IEEE80211_OFDM9 */ 850 24, /* IFM_IEEE80211_OFDM12 */ 851 36, /* IFM_IEEE80211_OFDM18 */ 852 48, /* IFM_IEEE80211_OFDM24 */ 853 72, /* IFM_IEEE80211_OFDM36 */ 854 96, /* IFM_IEEE80211_OFDM48 */ 855 108, /* IFM_IEEE80211_OFDM54 */ 856 144, /* IFM_IEEE80211_OFDM72 */ 857 }; 858 return IFM_SUBTYPE(mword) < N(ieeerates) ? 859 ieeerates[IFM_SUBTYPE(mword)] : 0; 860 #undef N 861 } 862 863 /* 864 * Module glue. 865 * 866 * NB: the module name is "wlan" for compatibility with NetBSD. 867 */ 868 869 static int 870 ieee80211_modevent(module_t mod, int type, void *unused) 871 { 872 switch (type) { 873 case MOD_LOAD: 874 if (bootverbose) 875 printf("wlan: <802.11 Link Layer>\n"); 876 return 0; 877 case MOD_UNLOAD: 878 return 0; 879 } 880 return EINVAL; 881 } 882 883 static moduledata_t ieee80211_mod = { 884 "wlan", 885 ieee80211_modevent, 886 0 887 }; 888 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 889 MODULE_VERSION(wlan, 1); 890 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 891 MODULE_DEPEND(wlan, ether, 1, 1, 1); 892
Indexes created Thu Oct 02 10:09:58 GMT 2025