ieee80211.c revision 1.10
1 /* $NetBSD: ieee80211.c,v 1.10 2004/04/30 23:58:05 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211.c,v 1.11 2004/04/02 20:19:20 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.10 2004/04/30 23:58:05 dyoung Exp $"); 39 #endif 40 41 /* 42 * IEEE 802.11 generic handler 43 */ 44 45 #include "opt_inet.h" 46 #include "bpfilter.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/malloc.h> 52 #include <sys/kernel.h> 53 #include <sys/socket.h> 54 #include <sys/sockio.h> 55 #include <sys/endian.h> 56 #include <sys/errno.h> 57 #ifdef __FreeBSD__ 58 #include <sys/bus.h> 59 #endif 60 #include <sys/proc.h> 61 #include <sys/sysctl.h> 62 63 #ifdef __FreeBSD__ 64 #include <machine/atomic.h> 65 #endif 66 67 #include <net/if.h> 68 #include <net/if_dl.h> 69 #include <net/if_media.h> 70 #include <net/if_arp.h> 71 #ifdef __FreeBSD__ 72 #include <net/ethernet.h> 73 #else 74 #include <net/if_ether.h> 75 #endif 76 #include <net/if_llc.h> 77 78 #include <net80211/ieee80211_var.h> 79 #include <net80211/ieee80211_compat.h> 80 81 #include <net/bpf.h> 82 83 #ifdef INET 84 #include <netinet/in.h> 85 #ifdef __FreeBSD__ 86 #include <netinet/if_ether.h> 87 #else 88 #include <net/if_ether.h> 89 #endif 90 #endif 91 92 #ifdef IEEE80211_DEBUG 93 int ieee80211_debug = 0; 94 #ifdef __FreeBSD__ 95 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 96 0, "IEEE 802.11 media debugging printfs"); 97 #endif 98 #endif 99 100 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 101 enum ieee80211_phymode); 102 103 static const char *ieee80211_phymode_name[] = { 104 "auto", /* IEEE80211_MODE_AUTO */ 105 "11a", /* IEEE80211_MODE_11A */ 106 "11b", /* IEEE80211_MODE_11B */ 107 "11g", /* IEEE80211_MODE_11G */ 108 "FH", /* IEEE80211_MODE_FH */ 109 "turbo", /* IEEE80211_MODE_TURBO */ 110 }; 111 112 void 113 ieee80211_ifattach(struct ifnet *ifp) 114 { 115 struct ieee80211com *ic = (void *)ifp; 116 struct ieee80211_channel *c; 117 int i; 118 119 ether_ifattach(ifp, ic->ic_myaddr); 120 #if NBPFILTER > 0 121 bpfattach2(ifp, DLT_IEEE802_11, 122 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 123 #endif 124 ieee80211_crypto_attach(ifp); 125 126 /* 127 * Fill in 802.11 available channel set, mark 128 * all available channels as active, and pick 129 * a default channel if not already specified. 130 */ 131 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 132 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 133 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 134 c = &ic->ic_channels[i]; 135 if (c->ic_flags) { 136 /* 137 * Verify driver passed us valid data. 138 */ 139 if (i != ieee80211_chan2ieee(ic, c)) { 140 if_printf(ifp, "bad channel ignored; " 141 "freq %u flags %x number %u\n", 142 c->ic_freq, c->ic_flags, i); 143 c->ic_flags = 0; /* NB: remove */ 144 continue; 145 } 146 setbit(ic->ic_chan_avail, i); 147 /* 148 * Identify mode capabilities. 149 */ 150 if (IEEE80211_IS_CHAN_A(c)) 151 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 152 if (IEEE80211_IS_CHAN_B(c)) 153 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 154 if (IEEE80211_IS_CHAN_PUREG(c)) 155 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 156 if (IEEE80211_IS_CHAN_FHSS(c)) 157 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 158 if (IEEE80211_IS_CHAN_T(c)) 159 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 160 } 161 } 162 /* validate ic->ic_curmode */ 163 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 164 ic->ic_curmode = IEEE80211_MODE_AUTO; 165 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 166 167 (void) ieee80211_setmode(ic, ic->ic_curmode); 168 169 if (ic->ic_lintval == 0) 170 ic->ic_lintval = 100; /* default sleep */ 171 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 172 173 ieee80211_node_attach(ifp); 174 ieee80211_proto_attach(ifp); 175 } 176 177 void 178 ieee80211_ifdetach(struct ifnet *ifp) 179 { 180 struct ieee80211com *ic = (void *)ifp; 181 182 ieee80211_proto_detach(ifp); 183 ieee80211_crypto_detach(ifp); 184 ieee80211_node_detach(ifp); 185 #ifdef __FreeBSD__ 186 ifmedia_removeall(&ic->ic_media); 187 #else 188 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 189 #endif 190 #if NBPFILTER > 0 191 bpfdetach(ifp); 192 #endif 193 ether_ifdetach(ifp); 194 } 195 196 /* 197 * Convert MHz frequency to IEEE channel number. 198 */ 199 u_int 200 ieee80211_mhz2ieee(u_int freq, u_int flags) 201 { 202 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 203 if (freq == 2484) 204 return 14; 205 if (freq < 2484) 206 return (freq - 2407) / 5; 207 else 208 return 15 + ((freq - 2512) / 20); 209 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 210 return (freq - 5000) / 5; 211 } else { /* either, guess */ 212 if (freq == 2484) 213 return 14; 214 if (freq < 2484) 215 return (freq - 2407) / 5; 216 if (freq < 5000) 217 return 15 + ((freq - 2512) / 20); 218 return (freq - 5000) / 5; 219 } 220 } 221 222 /* 223 * Convert channel to IEEE channel number. 224 */ 225 u_int 226 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 227 { 228 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 229 return c - ic->ic_channels; 230 else if (c == IEEE80211_CHAN_ANYC) 231 return IEEE80211_CHAN_ANY; 232 else if (c != NULL) { 233 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 234 c->ic_freq, c->ic_flags); 235 return 0; /* XXX */ 236 } else { 237 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 238 return 0; /* XXX */ 239 } 240 } 241 242 /* 243 * Convert IEEE channel number to MHz frequency. 244 */ 245 u_int 246 ieee80211_ieee2mhz(u_int chan, u_int flags) 247 { 248 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 249 if (chan == 14) 250 return 2484; 251 if (chan < 14) 252 return 2407 + chan*5; 253 else 254 return 2512 + ((chan-15)*20); 255 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 256 return 5000 + (chan*5); 257 } else { /* either, guess */ 258 if (chan == 14) 259 return 2484; 260 if (chan < 14) /* 0-13 */ 261 return 2407 + chan*5; 262 if (chan < 27) /* 15-26 */ 263 return 2512 + ((chan-15)*20); 264 return 5000 + (chan*5); 265 } 266 } 267 268 /* 269 * Setup the media data structures according to the channel and 270 * rate tables. This must be called by the driver after 271 * ieee80211_attach and before most anything else. 272 */ 273 void 274 ieee80211_media_init(struct ifnet *ifp, 275 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 276 { 277 #define ADD(_ic, _s, _o) \ 278 ifmedia_add(&(_ic)->ic_media, \ 279 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 280 struct ieee80211com *ic = (void *)ifp; 281 struct ifmediareq imr; 282 int i, j, mode, rate, maxrate, mword, mopt, r; 283 struct ieee80211_rateset *rs; 284 struct ieee80211_rateset allrates; 285 286 /* 287 * Do late attach work that must wait for any subclass 288 * (i.e. driver) work such as overriding methods. 289 */ 290 ieee80211_node_lateattach(ifp); 291 292 /* 293 * Fill in media characteristics. 294 */ 295 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 296 maxrate = 0; 297 memset(&allrates, 0, sizeof(allrates)); 298 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 299 static const u_int mopts[] = { 300 IFM_AUTO, 301 IFM_IEEE80211_11A, 302 IFM_IEEE80211_11B, 303 IFM_IEEE80211_11G, 304 IFM_IEEE80211_FH, 305 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 306 }; 307 if ((ic->ic_modecaps & (1<<mode)) == 0) 308 continue; 309 mopt = mopts[mode]; 310 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 311 if (ic->ic_caps & IEEE80211_C_IBSS) 312 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 313 if (ic->ic_caps & IEEE80211_C_HOSTAP) 314 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 315 if (ic->ic_caps & IEEE80211_C_AHDEMO) 316 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 317 if (ic->ic_caps & IEEE80211_C_MONITOR) 318 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 319 if (mode == IEEE80211_MODE_AUTO) 320 continue; 321 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 322 rs = &ic->ic_sup_rates[mode]; 323 for (i = 0; i < rs->rs_nrates; i++) { 324 rate = rs->rs_rates[i]; 325 mword = ieee80211_rate2media(ic, rate, mode); 326 if (mword == 0) 327 continue; 328 printf("%s%d%sMbps", (i != 0 ? " " : ""), 329 (rate & IEEE80211_RATE_VAL) / 2, 330 ((rate & 0x1) != 0 ? ".5" : "")); 331 ADD(ic, mword, mopt); 332 if (ic->ic_caps & IEEE80211_C_IBSS) 333 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 334 if (ic->ic_caps & IEEE80211_C_HOSTAP) 335 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 336 if (ic->ic_caps & IEEE80211_C_AHDEMO) 337 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 338 if (ic->ic_caps & IEEE80211_C_MONITOR) 339 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 340 /* 341 * Add rate to the collection of all rates. 342 */ 343 r = rate & IEEE80211_RATE_VAL; 344 for (j = 0; j < allrates.rs_nrates; j++) 345 if (allrates.rs_rates[j] == r) 346 break; 347 if (j == allrates.rs_nrates) { 348 /* unique, add to the set */ 349 allrates.rs_rates[j] = r; 350 allrates.rs_nrates++; 351 } 352 rate = (rate & IEEE80211_RATE_VAL) / 2; 353 if (rate > maxrate) 354 maxrate = rate; 355 } 356 printf("\n"); 357 } 358 for (i = 0; i < allrates.rs_nrates; i++) { 359 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 360 IEEE80211_MODE_AUTO); 361 if (mword == 0) 362 continue; 363 mword = IFM_SUBTYPE(mword); /* remove media options */ 364 ADD(ic, mword, 0); 365 if (ic->ic_caps & IEEE80211_C_IBSS) 366 ADD(ic, mword, IFM_IEEE80211_ADHOC); 367 if (ic->ic_caps & IEEE80211_C_HOSTAP) 368 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 369 if (ic->ic_caps & IEEE80211_C_AHDEMO) 370 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 371 if (ic->ic_caps & IEEE80211_C_MONITOR) 372 ADD(ic, mword, IFM_IEEE80211_MONITOR); 373 } 374 ieee80211_media_status(ifp, &imr); 375 ifmedia_set(&ic->ic_media, imr.ifm_active); 376 377 if (maxrate) 378 ifp->if_baudrate = IF_Mbps(maxrate); 379 380 if (ic->ic_max_aid == 0) 381 ic->ic_max_aid = IEEE80211_MAX_AID; 382 383 #undef ADD 384 } 385 386 static int 387 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 388 { 389 #define IEEERATE(_ic,_m,_i) \ 390 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 391 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 392 for (i = 0; i < nrates; i++) 393 if (IEEERATE(ic, mode, i) == rate) 394 return i; 395 return -1; 396 #undef IEEERATE 397 } 398 399 /* 400 * Handle a media change request. 401 */ 402 int 403 ieee80211_media_change(struct ifnet *ifp) 404 { 405 struct ieee80211com *ic = (void *)ifp; 406 struct ifmedia_entry *ime; 407 enum ieee80211_opmode newopmode; 408 enum ieee80211_phymode newphymode; 409 int i, j, newrate, error = 0; 410 411 ime = ic->ic_media.ifm_cur; 412 /* 413 * First, identify the phy mode. 414 */ 415 switch (IFM_MODE(ime->ifm_media)) { 416 case IFM_IEEE80211_11A: 417 newphymode = IEEE80211_MODE_11A; 418 break; 419 case IFM_IEEE80211_11B: 420 newphymode = IEEE80211_MODE_11B; 421 break; 422 case IFM_IEEE80211_11G: 423 newphymode = IEEE80211_MODE_11G; 424 break; 425 case IFM_IEEE80211_FH: 426 newphymode = IEEE80211_MODE_FH; 427 break; 428 case IFM_AUTO: 429 newphymode = IEEE80211_MODE_AUTO; 430 break; 431 default: 432 return EINVAL; 433 } 434 /* 435 * Turbo mode is an ``option''. Eventually it 436 * needs to be applied to 11g too. 437 */ 438 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 439 if (newphymode != IEEE80211_MODE_11A) 440 return EINVAL; 441 newphymode = IEEE80211_MODE_TURBO; 442 } 443 /* 444 * Validate requested mode is available. 445 */ 446 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 447 return EINVAL; 448 449 /* 450 * Next, the fixed/variable rate. 451 */ 452 i = -1; 453 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 454 /* 455 * Convert media subtype to rate. 456 */ 457 newrate = ieee80211_media2rate(ime->ifm_media); 458 if (newrate == 0) 459 return EINVAL; 460 /* 461 * Check the rate table for the specified/current phy. 462 */ 463 if (newphymode == IEEE80211_MODE_AUTO) { 464 /* 465 * In autoselect mode search for the rate. 466 */ 467 for (j = IEEE80211_MODE_11A; 468 j < IEEE80211_MODE_MAX; j++) { 469 if ((ic->ic_modecaps & (1<<j)) == 0) 470 continue; 471 i = findrate(ic, j, newrate); 472 if (i != -1) { 473 /* lock mode too */ 474 newphymode = j; 475 break; 476 } 477 } 478 } else { 479 i = findrate(ic, newphymode, newrate); 480 } 481 if (i == -1) /* mode/rate mismatch */ 482 return EINVAL; 483 } 484 /* NB: defer rate setting to later */ 485 486 /* 487 * Deduce new operating mode but don't install it just yet. 488 */ 489 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 490 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 491 newopmode = IEEE80211_M_AHDEMO; 492 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 493 newopmode = IEEE80211_M_HOSTAP; 494 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 495 newopmode = IEEE80211_M_IBSS; 496 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 497 newopmode = IEEE80211_M_MONITOR; 498 else 499 newopmode = IEEE80211_M_STA; 500 501 /* 502 * Autoselect doesn't make sense when operating as an AP. 503 * If no phy mode has been selected, pick one and lock it 504 * down so rate tables can be used in forming beacon frames 505 * and the like. 506 */ 507 if (newopmode == IEEE80211_M_HOSTAP && 508 newphymode == IEEE80211_MODE_AUTO) { 509 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 510 if (ic->ic_modecaps & (1<<j)) { 511 newphymode = j; 512 break; 513 } 514 } 515 516 /* 517 * Handle phy mode change. 518 */ 519 if (ic->ic_curmode != newphymode) { /* change phy mode */ 520 error = ieee80211_setmode(ic, newphymode); 521 if (error != 0) 522 return error; 523 error = ENETRESET; 524 } 525 526 /* 527 * Committed to changes, install the rate setting. 528 */ 529 if (ic->ic_fixed_rate != i) { 530 ic->ic_fixed_rate = i; /* set fixed tx rate */ 531 error = ENETRESET; 532 } 533 534 /* 535 * Handle operating mode change. 536 */ 537 if (ic->ic_opmode != newopmode) { 538 ic->ic_opmode = newopmode; 539 switch (newopmode) { 540 case IEEE80211_M_AHDEMO: 541 case IEEE80211_M_HOSTAP: 542 case IEEE80211_M_STA: 543 case IEEE80211_M_MONITOR: 544 ic->ic_flags &= ~IEEE80211_F_IBSSON; 545 break; 546 case IEEE80211_M_IBSS: 547 ic->ic_flags |= IEEE80211_F_IBSSON; 548 #ifdef notdef 549 if (ic->ic_curmode == IEEE80211_MODE_11G) 550 ieee80211_set11gbasicrates( 551 &ic->ic_suprates[newphymode], 552 IEEE80211_MODE_11B); 553 #endif 554 break; 555 } 556 error = ENETRESET; 557 } 558 #ifdef notdef 559 if (error == 0) 560 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 561 #endif 562 return error; 563 } 564 565 void 566 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 567 { 568 struct ieee80211com *ic = (void *)ifp; 569 struct ieee80211_node *ni = NULL; 570 571 imr->ifm_status = IFM_AVALID; 572 imr->ifm_active = IFM_IEEE80211; 573 if (ic->ic_state == IEEE80211_S_RUN) 574 imr->ifm_status |= IFM_ACTIVE; 575 imr->ifm_active |= IFM_AUTO; 576 switch (ic->ic_opmode) { 577 case IEEE80211_M_STA: 578 ni = ic->ic_bss; 579 /* calculate rate subtype */ 580 imr->ifm_active |= ieee80211_rate2media(ic, 581 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 582 break; 583 case IEEE80211_M_IBSS: 584 imr->ifm_active |= IFM_IEEE80211_ADHOC; 585 break; 586 case IEEE80211_M_AHDEMO: 587 /* should not come here */ 588 break; 589 case IEEE80211_M_HOSTAP: 590 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 591 break; 592 case IEEE80211_M_MONITOR: 593 imr->ifm_active |= IFM_IEEE80211_MONITOR; 594 break; 595 } 596 switch (ic->ic_curmode) { 597 case IEEE80211_MODE_11A: 598 imr->ifm_active |= IFM_IEEE80211_11A; 599 break; 600 case IEEE80211_MODE_11B: 601 imr->ifm_active |= IFM_IEEE80211_11B; 602 break; 603 case IEEE80211_MODE_11G: 604 imr->ifm_active |= IFM_IEEE80211_11G; 605 break; 606 case IEEE80211_MODE_FH: 607 imr->ifm_active |= IFM_IEEE80211_FH; 608 break; 609 case IEEE80211_MODE_TURBO: 610 imr->ifm_active |= IFM_IEEE80211_11A 611 | IFM_IEEE80211_TURBO; 612 break; 613 } 614 } 615 616 void 617 ieee80211_watchdog(struct ifnet *ifp) 618 { 619 struct ieee80211com *ic = (void *)ifp; 620 621 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 622 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 623 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 624 ieee80211_timeout_nodes(ic); 625 626 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 627 ifp->if_timer = 1; 628 } 629 630 /* 631 * Mark the basic rates for the 11g rate table based on the 632 * operating mode. For real 11g we mark all the 11b rates 633 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 634 * 11b rates. There's also a pseudo 11a-mode used to mark only 635 * the basic OFDM rates. 636 */ 637 static void 638 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 639 { 640 static const struct ieee80211_rateset basic[] = { 641 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 642 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 643 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 644 { 0 }, /* IEEE80211_MODE_FH */ 645 { 0 }, /* IEEE80211_MODE_TURBO */ 646 }; 647 int i, j; 648 649 for (i = 0; i < rs->rs_nrates; i++) { 650 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 651 for (j = 0; j < basic[mode].rs_nrates; j++) 652 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 653 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 654 break; 655 } 656 } 657 } 658 659 /* 660 * Set the current phy mode and recalculate the active channel 661 * set based on the available channels for this mode. Also 662 * select a new default/current channel if the current one is 663 * inappropriate for this mode. 664 */ 665 int 666 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 667 { 668 #define N(a) (sizeof(a) / sizeof(a[0])) 669 static const u_int chanflags[] = { 670 0, /* IEEE80211_MODE_AUTO */ 671 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 672 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 673 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 674 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 675 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 676 }; 677 struct ieee80211_channel *c; 678 u_int modeflags; 679 int i; 680 681 /* validate new mode */ 682 if ((ic->ic_modecaps & (1<<mode)) == 0) { 683 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 684 __func__, mode, ic->ic_modecaps)); 685 return EINVAL; 686 } 687 688 /* 689 * Verify at least one channel is present in the available 690 * channel list before committing to the new mode. 691 */ 692 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 693 modeflags = chanflags[mode]; 694 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 695 c = &ic->ic_channels[i]; 696 if (mode == IEEE80211_MODE_AUTO) { 697 /* ignore turbo channels for autoselect */ 698 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 699 break; 700 } else { 701 if ((c->ic_flags & modeflags) == modeflags) 702 break; 703 } 704 } 705 if (i > IEEE80211_CHAN_MAX) { 706 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 707 __func__, mode)); 708 return EINVAL; 709 } 710 711 /* 712 * Calculate the active channel set. 713 */ 714 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 715 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 716 c = &ic->ic_channels[i]; 717 if (mode == IEEE80211_MODE_AUTO) { 718 /* take anything but pure turbo channels */ 719 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 720 setbit(ic->ic_chan_active, i); 721 } else { 722 if ((c->ic_flags & modeflags) == modeflags) 723 setbit(ic->ic_chan_active, i); 724 } 725 } 726 /* 727 * If no current/default channel is setup or the current 728 * channel is wrong for the mode then pick the first 729 * available channel from the active list. This is likely 730 * not the right one. 731 */ 732 if (ic->ic_ibss_chan == NULL || 733 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 734 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 735 if (isset(ic->ic_chan_active, i)) { 736 ic->ic_ibss_chan = &ic->ic_channels[i]; 737 break; 738 } 739 IASSERT(ic->ic_ibss_chan != NULL && 740 isset(ic->ic_chan_active, 741 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 742 ("Bad IBSS channel %u\n", 743 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 744 } 745 746 /* 747 * Set/reset state flags that influence beacon contents, etc. 748 * 749 * XXX what if we have stations already associated??? 750 * XXX probably not right for autoselect? 751 */ 752 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 753 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 754 if (mode == IEEE80211_MODE_11G) { 755 if (ic->ic_caps & IEEE80211_C_SHSLOT) 756 ic->ic_flags |= IEEE80211_F_SHSLOT; 757 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 758 IEEE80211_MODE_11G); 759 } else { 760 ic->ic_flags &= ~IEEE80211_F_SHSLOT; 761 } 762 763 ic->ic_curmode = mode; 764 return 0; 765 #undef N 766 } 767 768 /* 769 * Return the phy mode for with the specified channel so the 770 * caller can select a rate set. This is problematic and the 771 * work here assumes how things work elsewhere in this code. 772 * 773 * XXX never returns turbo modes -dcy 774 */ 775 enum ieee80211_phymode 776 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 777 { 778 /* 779 * NB: this assumes the channel would not be supplied to us 780 * unless it was already compatible with the current mode. 781 */ 782 if (ic->ic_curmode != IEEE80211_MODE_AUTO) 783 return ic->ic_curmode; 784 /* 785 * In autoselect mode; deduce a mode based on the channel 786 * characteristics. We assume that turbo-only channels 787 * are not considered when the channel set is constructed. 788 */ 789 if (IEEE80211_IS_CHAN_5GHZ(chan)) 790 return IEEE80211_MODE_11A; 791 else if (IEEE80211_IS_CHAN_FHSS(chan)) 792 return IEEE80211_MODE_FH; 793 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 794 return IEEE80211_MODE_11G; 795 else 796 return IEEE80211_MODE_11B; 797 } 798 799 /* 800 * convert IEEE80211 rate value to ifmedia subtype. 801 * ieee80211 rate is in unit of 0.5Mbps. 802 */ 803 int 804 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 805 { 806 #define N(a) (sizeof(a) / sizeof(a[0])) 807 static const struct { 808 u_int m; /* rate + mode */ 809 u_int r; /* if_media rate */ 810 } rates[] = { 811 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 812 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 813 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 814 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 815 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 816 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 817 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 818 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 819 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 820 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 821 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 822 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 823 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 824 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 825 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 826 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 827 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 828 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 829 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 830 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 831 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 832 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 833 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 834 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 835 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 836 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 837 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 838 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 839 }; 840 u_int mask, i; 841 842 mask = rate & IEEE80211_RATE_VAL; 843 switch (mode) { 844 case IEEE80211_MODE_11A: 845 case IEEE80211_MODE_TURBO: 846 mask |= IFM_IEEE80211_11A; 847 break; 848 case IEEE80211_MODE_11B: 849 mask |= IFM_IEEE80211_11B; 850 break; 851 case IEEE80211_MODE_FH: 852 mask |= IFM_IEEE80211_FH; 853 break; 854 case IEEE80211_MODE_AUTO: 855 /* NB: ic may be NULL for some drivers */ 856 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 857 mask |= IFM_IEEE80211_FH; 858 break; 859 } 860 /* NB: hack, 11g matches both 11b+11a rates */ 861 /* fall thru... */ 862 case IEEE80211_MODE_11G: 863 mask |= IFM_IEEE80211_11G; 864 break; 865 } 866 for (i = 0; i < N(rates); i++) 867 if (rates[i].m == mask) 868 return rates[i].r; 869 return IFM_AUTO; 870 #undef N 871 } 872 873 int 874 ieee80211_media2rate(int mword) 875 { 876 #define N(a) (sizeof(a) / sizeof(a[0])) 877 int i; 878 static const struct { 879 int subtype; 880 int rate; 881 } ieeerates[] = { 882 { IFM_AUTO, -1 }, 883 { IFM_MANUAL, 0 }, 884 { IFM_NONE, 0 }, 885 { IFM_IEEE80211_FH1, 2 }, 886 { IFM_IEEE80211_FH2, 4 }, 887 { IFM_IEEE80211_DS1, 2 }, 888 { IFM_IEEE80211_DS2, 4 }, 889 { IFM_IEEE80211_DS5, 11 }, 890 { IFM_IEEE80211_DS11, 22 }, 891 { IFM_IEEE80211_DS22, 44 }, 892 { IFM_IEEE80211_OFDM6, 12 }, 893 { IFM_IEEE80211_OFDM9, 18 }, 894 { IFM_IEEE80211_OFDM12, 24 }, 895 { IFM_IEEE80211_OFDM18, 36 }, 896 { IFM_IEEE80211_OFDM24, 48 }, 897 { IFM_IEEE80211_OFDM36, 72 }, 898 { IFM_IEEE80211_OFDM48, 96 }, 899 { IFM_IEEE80211_OFDM54, 108 }, 900 { IFM_IEEE80211_OFDM72, 144 }, 901 }; 902 for (i = 0; i < N(ieeerates); i++) { 903 if (ieeerates[i].subtype == IFM_SUBTYPE(mword)) 904 return ieeerates[i].rate; 905 } 906 return 0; 907 #undef N 908 } 909 910 #ifdef __FreeBSD__ 911 /* 912 * Module glue. 913 * 914 * NB: the module name is "wlan" for compatibility with NetBSD. 915 */ 916 917 static int 918 ieee80211_modevent(module_t mod, int type, void *unused) 919 { 920 switch (type) { 921 case MOD_LOAD: 922 if (bootverbose) 923 printf("wlan: <802.11 Link Layer>\n"); 924 return 0; 925 case MOD_UNLOAD: 926 return 0; 927 } 928 return EINVAL; 929 } 930 931 static moduledata_t ieee80211_mod = { 932 "wlan", 933 ieee80211_modevent, 934 0 935 }; 936 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 937 MODULE_VERSION(wlan, 1); 938 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 939 MODULE_DEPEND(wlan, ether, 1, 1, 1); 940 #endif 941
Indexes created Mon Sep 22 21:09:42 GMT 2025