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sys/net80211/ieee80211.c
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1 /* $NetBSD: ieee80211.c,v 1.9.2.2 2004/07/23 23:28:59 he 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 1.8 2003/09/14 22:32:18 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.9.2.2 2004/07/23 23:28:59 he 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_setbasicrates(struct ieee80211com *); 101 102 static const char * 103 ieee80211_phymode_name(enum ieee80211_phymode mode) 104 { 105 int i; 106 struct { 107 enum ieee80211_phymode mode; 108 const char *name; 109 } modenames[] = { 110 { IEEE80211_MODE_AUTO, "auto" }, 111 { IEEE80211_MODE_11A, "11a" }, 112 { IEEE80211_MODE_11B, "11b" }, 113 { IEEE80211_MODE_11G, "11g" }, 114 { IEEE80211_MODE_FH, "FH" }, 115 { IEEE80211_MODE_TURBO, "turbo" } 116 }; 117 for (i = 0; i < sizeof(modenames) / sizeof(modenames[0]); i++) { 118 if (mode == modenames[i].mode) 119 return modenames[i].name; 120 } 121 return "<unknown>"; 122 } 123 124 void 125 ieee80211_ifattach(struct ifnet *ifp) 126 { 127 struct ieee80211com *ic = (void *)ifp; 128 struct ieee80211_channel *c; 129 int i; 130 131 ether_ifattach(ifp, ic->ic_myaddr); 132 #if NBPFILTER > 0 133 bpfattach2(ifp, DLT_IEEE802_11, 134 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 135 #endif 136 ieee80211_crypto_attach(ifp); 137 138 /* 139 * Fill in 802.11 available channel set, mark 140 * all available channels as active, and pick 141 * a default channel if not already specified. 142 */ 143 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 144 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 145 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 146 c = &ic->ic_channels[i]; 147 if (c->ic_flags) { 148 /* 149 * Verify driver passed us valid data. 150 */ 151 if (i != ieee80211_chan2ieee(ic, c)) { 152 if_printf(ifp, "bad channel ignored; " 153 "freq %u flags %x number %u\n", 154 c->ic_freq, c->ic_flags, i); 155 c->ic_flags = 0; /* NB: remove */ 156 continue; 157 } 158 setbit(ic->ic_chan_avail, i); 159 /* 160 * Identify mode capabilities. 161 */ 162 if (IEEE80211_IS_CHAN_A(c)) 163 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 164 if (IEEE80211_IS_CHAN_B(c)) 165 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 166 if (IEEE80211_IS_CHAN_PUREG(c)) 167 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 168 if (IEEE80211_IS_CHAN_FHSS(c)) 169 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 170 if (IEEE80211_IS_CHAN_T(c)) 171 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 172 } 173 } 174 /* validate ic->ic_curmode */ 175 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 176 ic->ic_curmode = IEEE80211_MODE_AUTO; 177 178 ieee80211_setbasicrates(ic); 179 (void) ieee80211_setmode(ic, ic->ic_curmode); 180 181 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 182 if (ic->ic_lintval == 0) 183 ic->ic_lintval = 100; /* default sleep */ 184 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 185 186 ieee80211_node_attach(ifp); 187 ieee80211_proto_attach(ifp); 188 } 189 190 void 191 ieee80211_ifdetach(struct ifnet *ifp) 192 { 193 struct ieee80211com *ic = (void *)ifp; 194 195 ieee80211_proto_detach(ifp); 196 ieee80211_crypto_detach(ifp); 197 ieee80211_node_detach(ifp); 198 #ifdef __FreeBSD__ 199 ifmedia_removeall(&ic->ic_media); 200 #else 201 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 202 #endif 203 #if NBPFILTER > 0 204 bpfdetach(ifp); 205 #endif 206 ether_ifdetach(ifp); 207 } 208 209 /* 210 * Convert MHz frequency to IEEE channel number. 211 */ 212 u_int 213 ieee80211_mhz2ieee(u_int freq, u_int flags) 214 { 215 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 216 if (freq == 2484) 217 return 14; 218 if (freq < 2484) 219 return (freq - 2407) / 5; 220 else 221 return 15 + ((freq - 2512) / 20); 222 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 223 return (freq - 5000) / 5; 224 } else { /* either, guess */ 225 if (freq == 2484) 226 return 14; 227 if (freq < 2484) 228 return (freq - 2407) / 5; 229 if (freq < 5000) 230 return 15 + ((freq - 2512) / 20); 231 return (freq - 5000) / 5; 232 } 233 } 234 235 /* 236 * Convert channel to IEEE channel number. 237 */ 238 u_int 239 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 240 { 241 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 242 return c - ic->ic_channels; 243 else if (c == IEEE80211_CHAN_ANYC) 244 return IEEE80211_CHAN_ANY; 245 else if (c != NULL) { 246 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 247 c->ic_freq, c->ic_flags); 248 return 0; /* XXX */ 249 } else { 250 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 251 return 0; /* XXX */ 252 } 253 } 254 255 /* 256 * Convert IEEE channel number to MHz frequency. 257 */ 258 u_int 259 ieee80211_ieee2mhz(u_int chan, u_int flags) 260 { 261 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 262 if (chan == 14) 263 return 2484; 264 if (chan < 14) 265 return 2407 + chan*5; 266 else 267 return 2512 + ((chan-15)*20); 268 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 269 return 5000 + (chan*5); 270 } else { /* either, guess */ 271 if (chan == 14) 272 return 2484; 273 if (chan < 14) /* 0-13 */ 274 return 2407 + chan*5; 275 if (chan < 27) /* 15-26 */ 276 return 2512 + ((chan-15)*20); 277 return 5000 + (chan*5); 278 } 279 } 280 281 /* 282 * Setup the media data structures according to the channel and 283 * rate tables. This must be called by the driver after 284 * ieee80211_attach and before most anything else. 285 */ 286 void 287 ieee80211_media_init(struct ifnet *ifp, 288 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 289 { 290 #define ADD(_ic, _s, _o) \ 291 ifmedia_add(&(_ic)->ic_media, \ 292 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 293 struct ieee80211com *ic = (void *)ifp; 294 struct ifmediareq imr; 295 int i, j, mode, rate, maxrate, mword, mopt, r; 296 struct ieee80211_rateset *rs; 297 struct ieee80211_rateset allrates; 298 299 /* 300 * Do late attach work that must wait for any subclass 301 * (i.e. driver) work such as overriding methods. 302 */ 303 ieee80211_node_lateattach(ifp); 304 305 /* 306 * Fill in media characteristics. 307 */ 308 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 309 maxrate = 0; 310 memset(&allrates, 0, sizeof(allrates)); 311 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 312 static const u_int mopts[] = { 313 IFM_AUTO, 314 IFM_IEEE80211_11A, 315 IFM_IEEE80211_11B, 316 IFM_IEEE80211_11G, 317 IFM_IEEE80211_FH, 318 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 319 }; 320 if ((ic->ic_modecaps & (1<<mode)) == 0) 321 continue; 322 mopt = mopts[mode]; 323 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 324 if (ic->ic_caps & IEEE80211_C_IBSS) 325 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 326 if (ic->ic_caps & IEEE80211_C_HOSTAP) 327 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 328 if (ic->ic_caps & IEEE80211_C_AHDEMO) 329 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 330 if (ic->ic_caps & IEEE80211_C_MONITOR) 331 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 332 if (mode == IEEE80211_MODE_AUTO) 333 continue; 334 if_printf(ifp, "%s rates: ", ieee80211_phymode_name(mode)); 335 rs = &ic->ic_sup_rates[mode]; 336 for (i = 0; i < rs->rs_nrates; i++) { 337 rate = rs->rs_rates[i]; 338 mword = ieee80211_rate2media(ic, rate, mode); 339 if (mword == 0) 340 continue; 341 printf("%s%d%sMbps", (i != 0 ? " " : ""), 342 (rate & IEEE80211_RATE_VAL) / 2, 343 ((rate & 0x1) != 0 ? ".5" : "")); 344 ADD(ic, mword, mopt); 345 if (ic->ic_caps & IEEE80211_C_IBSS) 346 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 347 if (ic->ic_caps & IEEE80211_C_HOSTAP) 348 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 349 if (ic->ic_caps & IEEE80211_C_AHDEMO) 350 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 351 if (ic->ic_caps & IEEE80211_C_MONITOR) 352 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 353 /* 354 * Add rate to the collection of all rates. 355 */ 356 r = rate & IEEE80211_RATE_VAL; 357 for (j = 0; j < allrates.rs_nrates; j++) 358 if (allrates.rs_rates[j] == r) 359 break; 360 if (j == allrates.rs_nrates) { 361 /* unique, add to the set */ 362 allrates.rs_rates[j] = r; 363 allrates.rs_nrates++; 364 } 365 rate = (rate & IEEE80211_RATE_VAL) / 2; 366 if (rate > maxrate) 367 maxrate = rate; 368 } 369 printf("\n"); 370 } 371 for (i = 0; i < allrates.rs_nrates; i++) { 372 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 373 IEEE80211_MODE_AUTO); 374 if (mword == 0) 375 continue; 376 mword = IFM_SUBTYPE(mword); /* remove media options */ 377 ADD(ic, mword, 0); 378 if (ic->ic_caps & IEEE80211_C_IBSS) 379 ADD(ic, mword, IFM_IEEE80211_ADHOC); 380 if (ic->ic_caps & IEEE80211_C_HOSTAP) 381 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 382 if (ic->ic_caps & IEEE80211_C_AHDEMO) 383 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 384 if (ic->ic_caps & IEEE80211_C_MONITOR) 385 ADD(ic, mword, IFM_IEEE80211_MONITOR); 386 } 387 ieee80211_media_status(ifp, &imr); 388 ifmedia_set(&ic->ic_media, imr.ifm_active); 389 390 if (maxrate) 391 ifp->if_baudrate = IF_Mbps(maxrate); 392 393 if (ic->ic_max_aid == 0) 394 ic->ic_max_aid = IEEE80211_MAX_AID; 395 396 #undef ADD 397 } 398 399 static int 400 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 401 { 402 #define IEEERATE(_ic,_m,_i) \ 403 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 404 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 405 for (i = 0; i < nrates; i++) 406 if (IEEERATE(ic, mode, i) == rate) 407 return i; 408 return -1; 409 #undef IEEERATE 410 } 411 412 /* 413 * Handle a media change request. 414 */ 415 int 416 ieee80211_media_change(struct ifnet *ifp) 417 { 418 struct ieee80211com *ic = (void *)ifp; 419 struct ifmedia_entry *ime; 420 enum ieee80211_opmode newopmode; 421 enum ieee80211_phymode newphymode; 422 int i, j, newrate, error = 0; 423 424 ime = ic->ic_media.ifm_cur; 425 /* 426 * First, identify the phy mode. 427 */ 428 switch (IFM_MODE(ime->ifm_media)) { 429 case IFM_IEEE80211_11A: 430 newphymode = IEEE80211_MODE_11A; 431 break; 432 case IFM_IEEE80211_11B: 433 newphymode = IEEE80211_MODE_11B; 434 break; 435 case IFM_IEEE80211_11G: 436 newphymode = IEEE80211_MODE_11G; 437 break; 438 case IFM_IEEE80211_FH: 439 newphymode = IEEE80211_MODE_FH; 440 break; 441 case IFM_AUTO: 442 newphymode = IEEE80211_MODE_AUTO; 443 break; 444 default: 445 return EINVAL; 446 } 447 /* 448 * Turbo mode is an ``option''. Eventually it 449 * needs to be applied to 11g too. 450 */ 451 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 452 if (newphymode != IEEE80211_MODE_11A) 453 return EINVAL; 454 newphymode = IEEE80211_MODE_TURBO; 455 } 456 /* 457 * Validate requested mode is available. 458 */ 459 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 460 return EINVAL; 461 462 /* 463 * Next, the fixed/variable rate. 464 */ 465 i = -1; 466 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 467 /* 468 * Convert media subtype to rate. 469 */ 470 newrate = ieee80211_media2rate(ime->ifm_media); 471 if (newrate == 0) 472 return EINVAL; 473 /* 474 * Check the rate table for the specified/current phy. 475 */ 476 if (newphymode == IEEE80211_MODE_AUTO) { 477 /* 478 * In autoselect mode search for the rate. 479 */ 480 for (j = IEEE80211_MODE_11A; 481 j < IEEE80211_MODE_MAX; j++) { 482 if ((ic->ic_modecaps & (1<<j)) == 0) 483 continue; 484 i = findrate(ic, j, newrate); 485 if (i != -1) { 486 /* lock mode too */ 487 newphymode = j; 488 break; 489 } 490 } 491 } else { 492 i = findrate(ic, newphymode, newrate); 493 } 494 if (i == -1) /* mode/rate mismatch */ 495 return EINVAL; 496 } 497 /* NB: defer rate setting to later */ 498 499 /* 500 * Deduce new operating mode but don't install it just yet. 501 */ 502 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 503 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 504 newopmode = IEEE80211_M_AHDEMO; 505 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 506 newopmode = IEEE80211_M_HOSTAP; 507 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 508 newopmode = IEEE80211_M_IBSS; 509 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 510 newopmode = IEEE80211_M_MONITOR; 511 else 512 newopmode = IEEE80211_M_STA; 513 514 /* 515 * Autoselect doesn't make sense when operating as an AP. 516 * If no phy mode has been selected, pick one and lock it 517 * down so rate tables can be used in forming beacon frames 518 * and the like. 519 */ 520 if (newopmode == IEEE80211_M_HOSTAP && 521 newphymode == IEEE80211_MODE_AUTO) { 522 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 523 if (ic->ic_modecaps & (1<<j)) { 524 newphymode = j; 525 break; 526 } 527 } 528 529 /* 530 * Handle phy mode change. 531 */ 532 if (ic->ic_curmode != newphymode) { /* change phy mode */ 533 error = ieee80211_setmode(ic, newphymode); 534 if (error != 0) 535 return error; 536 error = ENETRESET; 537 } 538 539 /* 540 * Committed to changes, install the rate setting. 541 */ 542 if (ic->ic_fixed_rate != i) { 543 ic->ic_fixed_rate = i; /* set fixed tx rate */ 544 error = ENETRESET; 545 } 546 547 /* 548 * Handle operating mode change. 549 */ 550 if (ic->ic_opmode != newopmode) { 551 ic->ic_opmode = newopmode; 552 switch (newopmode) { 553 case IEEE80211_M_AHDEMO: 554 case IEEE80211_M_HOSTAP: 555 case IEEE80211_M_STA: 556 case IEEE80211_M_MONITOR: 557 ic->ic_flags &= ~IEEE80211_F_IBSSON; 558 break; 559 case IEEE80211_M_IBSS: 560 ic->ic_flags |= IEEE80211_F_IBSSON; 561 break; 562 } 563 error = ENETRESET; 564 } 565 #ifdef notdef 566 if (error == 0) 567 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 568 #endif 569 return error; 570 } 571 572 void 573 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 574 { 575 struct ieee80211com *ic = (void *)ifp; 576 struct ieee80211_node *ni = NULL; 577 578 imr->ifm_status = IFM_AVALID; 579 imr->ifm_active = IFM_IEEE80211; 580 if (ic->ic_state == IEEE80211_S_RUN) 581 imr->ifm_status |= IFM_ACTIVE; 582 imr->ifm_active |= IFM_AUTO; 583 switch (ic->ic_opmode) { 584 case IEEE80211_M_STA: 585 ni = ic->ic_bss; 586 /* calculate rate subtype */ 587 imr->ifm_active |= ieee80211_rate2media(ic, 588 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 589 break; 590 case IEEE80211_M_IBSS: 591 imr->ifm_active |= IFM_IEEE80211_ADHOC; 592 break; 593 case IEEE80211_M_AHDEMO: 594 /* should not come here */ 595 break; 596 case IEEE80211_M_HOSTAP: 597 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 598 break; 599 case IEEE80211_M_MONITOR: 600 imr->ifm_active |= IFM_IEEE80211_MONITOR; 601 break; 602 } 603 switch (ic->ic_curmode) { 604 case IEEE80211_MODE_11A: 605 imr->ifm_active |= IFM_IEEE80211_11A; 606 break; 607 case IEEE80211_MODE_11B: 608 imr->ifm_active |= IFM_IEEE80211_11B; 609 break; 610 case IEEE80211_MODE_11G: 611 imr->ifm_active |= IFM_IEEE80211_11G; 612 break; 613 case IEEE80211_MODE_FH: 614 imr->ifm_active |= IFM_IEEE80211_FH; 615 break; 616 case IEEE80211_MODE_TURBO: 617 imr->ifm_active |= IFM_IEEE80211_11A 618 | IFM_IEEE80211_TURBO; 619 break; 620 } 621 } 622 623 void 624 ieee80211_watchdog(struct ifnet *ifp) 625 { 626 struct ieee80211com *ic = (void *)ifp; 627 628 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 629 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 630 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 631 ieee80211_timeout_nodes(ic); 632 633 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 634 ifp->if_timer = 1; 635 } 636 637 /* 638 * Mark the basic rates for the 11g rate table based on the 639 * operating mode. For real 11g we mark all the 11b rates 640 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 641 * 11b rates. There's also a pseudo 11a-mode used to mark only 642 * the basic OFDM rates. 643 */ 644 static void 645 ieee80211_setbasicrates(struct ieee80211com *ic) 646 { 647 static const struct ieee80211_rateset basic[] = { 648 { 0 }, /* IEEE80211_MODE_AUTO */ 649 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 650 { 2, { 2, 4 } }, /* IEEE80211_MODE_11B */ 651 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 652 { 2, { 2, 4 } }, /* IEEE80211_MODE_FH */ 653 { 0 }, /* IEEE80211_MODE_TURBO */ 654 }; 655 enum ieee80211_phymode mode; 656 struct ieee80211_rateset *rs; 657 int i, j; 658 659 for (mode = 0; mode < IEEE80211_MODE_MAX; mode++) { 660 rs = &ic->ic_sup_rates[mode]; 661 for (i = 0; i < rs->rs_nrates; i++) { 662 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 663 for (j = 0; j < basic[mode].rs_nrates; j++) 664 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 665 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 666 break; 667 } 668 } 669 } 670 } 671 672 /* 673 * Set the current phy mode and recalculate the active channel 674 * set based on the available channels for this mode. Also 675 * select a new default/current channel if the current one is 676 * inappropriate for this mode. 677 */ 678 int 679 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 680 { 681 #define N(a) (sizeof(a) / sizeof(a[0])) 682 static const u_int chanflags[] = { 683 0, /* IEEE80211_MODE_AUTO */ 684 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 685 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 686 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 687 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 688 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 689 }; 690 struct ieee80211_channel *c; 691 u_int modeflags; 692 int i; 693 694 /* validate new mode */ 695 if ((ic->ic_modecaps & (1<<mode)) == 0) { 696 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 697 __func__, mode, ic->ic_modecaps)); 698 return EINVAL; 699 } 700 701 /* 702 * Verify at least one channel is present in the available 703 * channel list before committing to the new mode. 704 */ 705 IASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode)); 706 modeflags = chanflags[mode]; 707 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 708 c = &ic->ic_channels[i]; 709 if (mode == IEEE80211_MODE_AUTO) { 710 /* ignore turbo channels for autoselect */ 711 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 712 break; 713 } else { 714 if ((c->ic_flags & modeflags) == modeflags) 715 break; 716 } 717 } 718 if (i > IEEE80211_CHAN_MAX) { 719 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 720 __func__, mode)); 721 return EINVAL; 722 } 723 724 /* 725 * Calculate the active channel set. 726 */ 727 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 728 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 729 c = &ic->ic_channels[i]; 730 if (mode == IEEE80211_MODE_AUTO) { 731 /* take anything but pure turbo channels */ 732 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 733 setbit(ic->ic_chan_active, i); 734 } else { 735 if ((c->ic_flags & modeflags) == modeflags) 736 setbit(ic->ic_chan_active, i); 737 } 738 } 739 /* 740 * If no current/default channel is setup or the current 741 * channel is wrong for the mode then pick the first 742 * available channel from the active list. This is likely 743 * not the right one. 744 */ 745 if (ic->ic_ibss_chan == NULL || 746 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 747 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 748 if (isset(ic->ic_chan_active, i)) { 749 ic->ic_ibss_chan = &ic->ic_channels[i]; 750 break; 751 } 752 IASSERT(ic->ic_ibss_chan != NULL && 753 isset(ic->ic_chan_active, 754 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 755 ("Bad IBSS channel %u\n", 756 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 757 } 758 759 /* 760 * Set/reset state flags that influence beacon contents, etc. 761 * 762 * XXX what if we have stations already associated??? 763 * XXX probably not right for autoselect? 764 */ 765 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 766 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 767 if (mode == IEEE80211_MODE_11G) { 768 if (ic->ic_caps & IEEE80211_C_SHSLOT) 769 ic->ic_flags |= IEEE80211_F_SHSLOT; 770 } else 771 ic->ic_flags &= ~IEEE80211_F_SHSLOT; 772 773 ic->ic_curmode = mode; 774 return 0; 775 #undef N 776 } 777 778 /* 779 * Return the phy mode for with the specified channel so the 780 * caller can select a rate set. This is problematic and the 781 * work here assumes how things work elsewhere in this code. 782 * 783 * XXX never returns turbo modes -dcy 784 */ 785 enum ieee80211_phymode 786 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 787 { 788 /* 789 * NB: this assumes the channel would not be supplied to us 790 * unless it was already compatible with the current mode. 791 */ 792 if (ic->ic_curmode != IEEE80211_MODE_AUTO || 793 chan == IEEE80211_CHAN_ANYC) 794 return ic->ic_curmode; 795 /* 796 * In autoselect mode; deduce a mode based on the channel 797 * characteristics. We assume that turbo-only channels 798 * are not considered when the channel set is constructed. 799 */ 800 if (IEEE80211_IS_CHAN_5GHZ(chan)) 801 return IEEE80211_MODE_11A; 802 else if (IEEE80211_IS_CHAN_FHSS(chan)) 803 return IEEE80211_MODE_FH; 804 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 805 return IEEE80211_MODE_11G; 806 else 807 return IEEE80211_MODE_11B; 808 } 809 810 /* 811 * convert IEEE80211 rate value to ifmedia subtype. 812 * ieee80211 rate is in unit of 0.5Mbps. 813 */ 814 int 815 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 816 { 817 #define N(a) (sizeof(a) / sizeof(a[0])) 818 static const struct { 819 u_int m; /* rate + mode */ 820 u_int r; /* if_media rate */ 821 } rates[] = { 822 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 823 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 824 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 825 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 826 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 827 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 828 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 829 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 830 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 831 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 832 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 833 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 834 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 835 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 836 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 837 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 838 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 839 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 840 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 841 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 842 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 843 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 844 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 845 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 846 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 847 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 848 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 849 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 850 }; 851 u_int mask, i; 852 853 mask = rate & IEEE80211_RATE_VAL; 854 switch (mode) { 855 case IEEE80211_MODE_11A: 856 case IEEE80211_MODE_TURBO: 857 mask |= IFM_IEEE80211_11A; 858 break; 859 case IEEE80211_MODE_11B: 860 mask |= IFM_IEEE80211_11B; 861 break; 862 case IEEE80211_MODE_FH: 863 mask |= IFM_IEEE80211_FH; 864 break; 865 case IEEE80211_MODE_11G: 866 mask |= IFM_IEEE80211_11G; 867 break; 868 case IEEE80211_MODE_AUTO: 869 switch (ic->ic_phytype) { 870 case IEEE80211_T_FH: 871 mask |= IFM_IEEE80211_FH; 872 break; 873 case IEEE80211_T_DS: 874 mask |= IFM_IEEE80211_11B; 875 break; 876 case IEEE80211_T_OFDM: 877 case IEEE80211_T_TURBO: 878 mask |= IFM_IEEE80211_11G; 879 break; 880 } 881 } 882 for (i = 0; i < N(rates); i++) 883 if (rates[i].m == mask) 884 return rates[i].r; 885 return IFM_AUTO; 886 #undef N 887 } 888 889 int 890 ieee80211_media2rate(int mword) 891 { 892 #define N(a) (sizeof(a) / sizeof(a[0])) 893 int i; 894 static const struct { 895 int subtype; 896 int rate; 897 } ieeerates[] = { 898 { IFM_AUTO, -1 }, 899 { IFM_MANUAL, 0 }, 900 { IFM_NONE, 0 }, 901 { IFM_IEEE80211_FH1, 2 }, 902 { IFM_IEEE80211_FH2, 4 }, 903 { IFM_IEEE80211_DS1, 2 }, 904 { IFM_IEEE80211_DS2, 4 }, 905 { IFM_IEEE80211_DS5, 11 }, 906 { IFM_IEEE80211_DS11, 22 }, 907 { IFM_IEEE80211_DS22, 44 }, 908 { IFM_IEEE80211_OFDM6, 12 }, 909 { IFM_IEEE80211_OFDM9, 18 }, 910 { IFM_IEEE80211_OFDM12, 24 }, 911 { IFM_IEEE80211_OFDM18, 36 }, 912 { IFM_IEEE80211_OFDM24, 48 }, 913 { IFM_IEEE80211_OFDM36, 72 }, 914 { IFM_IEEE80211_OFDM48, 96 }, 915 { IFM_IEEE80211_OFDM54, 108 }, 916 { IFM_IEEE80211_OFDM72, 144 }, 917 }; 918 for (i = 0; i < N(ieeerates); i++) { 919 if (ieeerates[i].subtype == IFM_SUBTYPE(mword)) 920 return ieeerates[i].rate; 921 } 922 return 0; 923 #undef N 924 } 925 926 #ifdef __FreeBSD__ 927 /* 928 * Module glue. 929 * 930 * NB: the module name is "wlan" for compatibility with NetBSD. 931 */ 932 933 static int 934 ieee80211_modevent(module_t mod, int type, void *unused) 935 { 936 switch (type) { 937 case MOD_LOAD: 938 if (bootverbose) 939 printf("wlan: <802.11 Link Layer>\n"); 940 return 0; 941 case MOD_UNLOAD: 942 return 0; 943 } 944 return EINVAL; 945 } 946 947 static moduledata_t ieee80211_mod = { 948 "wlan", 949 ieee80211_modevent, 950 0 951 }; 952 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 953 MODULE_VERSION(wlan, 1); 954 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 955 #endif
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