ieee80211.c revision 1.5
1 /* $NetBSD: ieee80211.c,v 1.5 2003/10/13 04:28:35 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 1.7 2003/08/13 22:09:44 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.5 2003/10/13 04:28:35 dyoung Exp $"); 39 #endif 40 41 /* 42 * IEEE 802.11 generic handler 43 */ 44 45 #include "opt_inet.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/mbuf.h> 50 #include <sys/malloc.h> 51 #include <sys/kernel.h> 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/endian.h> 55 #include <sys/errno.h> 56 #ifdef __FreeBSD__ 57 #include <sys/bus.h> 58 #endif 59 #include <sys/proc.h> 60 #include <sys/sysctl.h> 61 62 #ifdef __FreeBSD__ 63 #include <machine/atomic.h> 64 #endif 65 66 #include <net/if.h> 67 #include <net/if_dl.h> 68 #include <net/if_media.h> 69 #include <net/if_arp.h> 70 #ifdef __FreeBSD__ 71 #include <net/ethernet.h> 72 #else 73 #include <net/if_ether.h> 74 #endif 75 #include <net/if_llc.h> 76 77 #include <net80211/ieee80211_var.h> 78 #include <net80211/ieee80211_compat.h> 79 80 #include <net/bpf.h> 81 82 #ifdef INET 83 #include <netinet/in.h> 84 #ifdef __FreeBSD__ 85 #include <netinet/if_ether.h> 86 #else 87 #include <net/if_ether.h> 88 #endif 89 #endif 90 91 #ifdef IEEE80211_DEBUG 92 int ieee80211_debug = 0; 93 #ifdef __FreeBSD__ 94 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 95 0, "IEEE 802.11 media debugging printfs"); 96 #endif 97 #endif 98 99 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 100 enum ieee80211_phymode); 101 102 static const char *ieee80211_phymode_name[] = { 103 "auto", /* IEEE80211_MODE_AUTO */ 104 "11a", /* IEEE80211_MODE_11A */ 105 "11b", /* IEEE80211_MODE_11B */ 106 "11g", /* IEEE80211_MODE_11G */ 107 "FH", /* IEEE80211_MODE_FH */ 108 "turbo", /* IEEE80211_MODE_TURBO */ 109 }; 110 111 void 112 ieee80211_ifattach(struct ifnet *ifp) 113 { 114 struct ieee80211com *ic = (void *)ifp; 115 struct ieee80211_channel *c; 116 int i; 117 118 ether_ifattach(ifp, ic->ic_myaddr); 119 bpfattach2(ifp, DLT_IEEE802_11, 120 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 121 ieee80211_crypto_attach(ifp); 122 123 /* 124 * Fill in 802.11 available channel set, mark 125 * all available channels as active, and pick 126 * a default channel if not already specified. 127 */ 128 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 129 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 130 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 131 c = &ic->ic_channels[i]; 132 if (c->ic_flags) { 133 /* 134 * Verify driver passed us valid data. 135 */ 136 if (i != ieee80211_chan2ieee(ic, c)) { 137 if_printf(ifp, "bad channel ignored; " 138 "freq %u flags %x number %u\n", 139 c->ic_freq, c->ic_flags, i); 140 c->ic_flags = 0; /* NB: remove */ 141 continue; 142 } 143 setbit(ic->ic_chan_avail, i); 144 /* 145 * Identify mode capabilities. 146 */ 147 if (IEEE80211_IS_CHAN_A(c)) 148 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 149 if (IEEE80211_IS_CHAN_B(c)) 150 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 151 if (IEEE80211_IS_CHAN_PUREG(c)) 152 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 153 if (IEEE80211_IS_CHAN_FHSS(c)) 154 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 155 if (IEEE80211_IS_CHAN_T(c)) 156 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 157 } 158 } 159 /* validate ic->ic_curmode */ 160 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 161 ic->ic_curmode = IEEE80211_MODE_AUTO; 162 163 (void) ieee80211_setmode(ic, ic->ic_curmode); 164 165 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 166 if (ic->ic_lintval == 0) 167 ic->ic_lintval = 100; /* default sleep */ 168 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 169 170 ieee80211_node_attach(ifp); 171 ieee80211_proto_attach(ifp); 172 } 173 174 void 175 ieee80211_ifdetach(struct ifnet *ifp) 176 { 177 struct ieee80211com *ic = (void *)ifp; 178 179 ieee80211_proto_detach(ifp); 180 ieee80211_crypto_detach(ifp); 181 ieee80211_node_detach(ifp); 182 #ifdef __FreeBSD__ 183 ifmedia_removeall(&ic->ic_media); 184 #else 185 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 186 #endif 187 bpfdetach(ifp); 188 ether_ifdetach(ifp); 189 } 190 191 /* 192 * Convert MHz frequency to IEEE channel number. 193 */ 194 u_int 195 ieee80211_mhz2ieee(u_int freq, u_int flags) 196 { 197 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 198 if (freq == 2484) 199 return 14; 200 if (freq < 2484) 201 return (freq - 2407) / 5; 202 else 203 return 15 + ((freq - 2512) / 20); 204 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 205 return (freq - 5000) / 5; 206 } else { /* either, guess */ 207 if (freq == 2484) 208 return 14; 209 if (freq < 2484) 210 return (freq - 2407) / 5; 211 if (freq < 5000) 212 return 15 + ((freq - 2512) / 20); 213 return (freq - 5000) / 5; 214 } 215 } 216 217 /* 218 * Convert channel to IEEE channel number. 219 */ 220 u_int 221 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 222 { 223 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 224 return c - ic->ic_channels; 225 else if (c == IEEE80211_CHAN_ANYC) 226 return IEEE80211_CHAN_ANY; 227 else if (c != NULL) { 228 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 229 c->ic_freq, c->ic_flags); 230 return 0; /* XXX */ 231 } else { 232 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 233 return 0; /* XXX */ 234 } 235 } 236 237 /* 238 * Convert IEEE channel number to MHz frequency. 239 */ 240 u_int 241 ieee80211_ieee2mhz(u_int chan, u_int flags) 242 { 243 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 244 if (chan == 14) 245 return 2484; 246 if (chan < 14) 247 return 2407 + chan*5; 248 else 249 return 2512 + ((chan-15)*20); 250 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 251 return 5000 + (chan*5); 252 } else { /* either, guess */ 253 if (chan == 14) 254 return 2484; 255 if (chan < 14) /* 0-13 */ 256 return 2407 + chan*5; 257 if (chan < 27) /* 15-26 */ 258 return 2512 + ((chan-15)*20); 259 return 5000 + (chan*5); 260 } 261 } 262 263 /* 264 * Setup the media data structures according to the channel and 265 * rate tables. This must be called by the driver after 266 * ieee80211_attach and before most anything else. 267 */ 268 void 269 ieee80211_media_init(struct ifnet *ifp, 270 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 271 { 272 #define ADD(_ic, _s, _o) \ 273 ifmedia_add(&(_ic)->ic_media, \ 274 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 275 struct ieee80211com *ic = (void *)ifp; 276 struct ifmediareq imr; 277 int i, j, mode, rate, maxrate, mword, mopt, r; 278 struct ieee80211_rateset *rs; 279 struct ieee80211_rateset allrates; 280 281 /* 282 * Do late attach work that must wait for any subclass 283 * (i.e. driver) work such as overriding methods. 284 */ 285 ieee80211_node_lateattach(ifp); 286 287 /* 288 * Fill in media characteristics. 289 */ 290 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 291 maxrate = 0; 292 memset(&allrates, 0, sizeof(allrates)); 293 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 294 static const u_int mopts[] = { 295 IFM_AUTO, 296 IFM_IEEE80211_11A, 297 IFM_IEEE80211_11B, 298 IFM_IEEE80211_11G, 299 IFM_IEEE80211_FH, 300 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 301 }; 302 if ((ic->ic_modecaps & (1<<mode)) == 0) 303 continue; 304 mopt = mopts[mode]; 305 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 306 if (ic->ic_caps & IEEE80211_C_IBSS) 307 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 308 if (ic->ic_caps & IEEE80211_C_HOSTAP) 309 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 310 if (ic->ic_caps & IEEE80211_C_AHDEMO) 311 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 312 if (ic->ic_caps & IEEE80211_C_MONITOR) 313 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 314 if (mode == IEEE80211_MODE_AUTO) 315 continue; 316 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 317 rs = &ic->ic_sup_rates[mode]; 318 for (i = 0; i < rs->rs_nrates; i++) { 319 rate = rs->rs_rates[i]; 320 mword = ieee80211_rate2media(ic, rate, mode); 321 if (mword == 0) 322 continue; 323 printf("%s%d%sMbps", (i != 0 ? " " : ""), 324 (rate & IEEE80211_RATE_VAL) / 2, 325 ((rate & 0x1) != 0 ? ".5" : "")); 326 ADD(ic, mword, mopt); 327 if (ic->ic_caps & IEEE80211_C_IBSS) 328 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 329 if (ic->ic_caps & IEEE80211_C_HOSTAP) 330 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 331 if (ic->ic_caps & IEEE80211_C_AHDEMO) 332 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 333 if (ic->ic_caps & IEEE80211_C_MONITOR) 334 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 335 /* 336 * Add rate to the collection of all rates. 337 */ 338 r = rate & IEEE80211_RATE_VAL; 339 for (j = 0; j < allrates.rs_nrates; j++) 340 if (allrates.rs_rates[j] == r) 341 break; 342 if (j == allrates.rs_nrates) { 343 /* unique, add to the set */ 344 allrates.rs_rates[j] = r; 345 allrates.rs_nrates++; 346 } 347 rate = (rate & IEEE80211_RATE_VAL) / 2; 348 if (rate > maxrate) 349 maxrate = rate; 350 } 351 printf("\n"); 352 } 353 for (i = 0; i < allrates.rs_nrates; i++) { 354 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 355 IEEE80211_MODE_AUTO); 356 if (mword == 0) 357 continue; 358 mword = IFM_SUBTYPE(mword); /* remove media options */ 359 ADD(ic, mword, 0); 360 if (ic->ic_caps & IEEE80211_C_IBSS) 361 ADD(ic, mword, IFM_IEEE80211_ADHOC); 362 if (ic->ic_caps & IEEE80211_C_HOSTAP) 363 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 364 if (ic->ic_caps & IEEE80211_C_AHDEMO) 365 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 366 if (ic->ic_caps & IEEE80211_C_MONITOR) 367 ADD(ic, mword, IFM_IEEE80211_MONITOR); 368 } 369 ieee80211_media_status(ifp, &imr); 370 ifmedia_set(&ic->ic_media, imr.ifm_active); 371 372 if (maxrate) 373 ifp->if_baudrate = IF_Mbps(maxrate); 374 375 if (ic->ic_max_aid == 0) 376 ic->ic_max_aid = IEEE80211_MAX_AID; 377 378 #undef ADD 379 } 380 381 static int 382 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 383 { 384 #define IEEERATE(_ic,_m,_i) \ 385 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 386 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 387 for (i = 0; i < nrates; i++) 388 if (IEEERATE(ic, mode, i) == rate) 389 return i; 390 return -1; 391 #undef IEEERATE 392 } 393 394 /* 395 * Handle a media change request. 396 */ 397 int 398 ieee80211_media_change(struct ifnet *ifp) 399 { 400 struct ieee80211com *ic = (void *)ifp; 401 struct ifmedia_entry *ime; 402 enum ieee80211_opmode newopmode; 403 enum ieee80211_phymode newphymode; 404 int i, j, newrate, error = 0; 405 406 ime = ic->ic_media.ifm_cur; 407 /* 408 * First, identify the phy mode. 409 */ 410 switch (IFM_MODE(ime->ifm_media)) { 411 case IFM_IEEE80211_11A: 412 newphymode = IEEE80211_MODE_11A; 413 break; 414 case IFM_IEEE80211_11B: 415 newphymode = IEEE80211_MODE_11B; 416 break; 417 case IFM_IEEE80211_11G: 418 newphymode = IEEE80211_MODE_11G; 419 break; 420 case IFM_IEEE80211_FH: 421 newphymode = IEEE80211_MODE_FH; 422 break; 423 case IFM_AUTO: 424 newphymode = IEEE80211_MODE_AUTO; 425 break; 426 default: 427 return EINVAL; 428 } 429 /* 430 * Turbo mode is an ``option''. Eventually it 431 * needs to be applied to 11g too. 432 */ 433 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 434 if (newphymode != IEEE80211_MODE_11A) 435 return EINVAL; 436 newphymode = IEEE80211_MODE_TURBO; 437 } 438 /* 439 * Validate requested mode is available. 440 */ 441 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 442 return EINVAL; 443 444 /* 445 * Next, the fixed/variable rate. 446 */ 447 i = -1; 448 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 449 /* 450 * Convert media subtype to rate. 451 */ 452 newrate = ieee80211_media2rate(ime->ifm_media); 453 if (newrate == 0) 454 return EINVAL; 455 /* 456 * Check the rate table for the specified/current phy. 457 */ 458 if (newphymode == IEEE80211_MODE_AUTO) { 459 /* 460 * In autoselect mode search for the rate. 461 */ 462 for (j = IEEE80211_MODE_11A; 463 j < IEEE80211_MODE_MAX; j++) { 464 if ((ic->ic_modecaps & (1<<j)) == 0) 465 continue; 466 i = findrate(ic, j, newrate); 467 if (i != -1) { 468 /* lock mode too */ 469 newphymode = j; 470 break; 471 } 472 } 473 } else { 474 i = findrate(ic, newphymode, newrate); 475 } 476 if (i == -1) /* mode/rate mismatch */ 477 return EINVAL; 478 } 479 /* NB: defer rate setting to later */ 480 481 /* 482 * Deduce new operating mode but don't install it just yet. 483 */ 484 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 485 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 486 newopmode = IEEE80211_M_AHDEMO; 487 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 488 newopmode = IEEE80211_M_HOSTAP; 489 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 490 newopmode = IEEE80211_M_IBSS; 491 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 492 newopmode = IEEE80211_M_MONITOR; 493 else 494 newopmode = IEEE80211_M_STA; 495 496 /* 497 * Autoselect doesn't make sense when operating as an AP. 498 * If no phy mode has been selected, pick one and lock it 499 * down so rate tables can be used in forming beacon frames 500 * and the like. 501 */ 502 if (newopmode == IEEE80211_M_HOSTAP && 503 newphymode == IEEE80211_MODE_AUTO) { 504 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 505 if (ic->ic_modecaps & (1<<j)) { 506 newphymode = j; 507 break; 508 } 509 } 510 511 /* 512 * Handle phy mode change. 513 */ 514 if (ic->ic_curmode != newphymode) { /* change phy mode */ 515 error = ieee80211_setmode(ic, newphymode); 516 if (error != 0) 517 return error; 518 error = ENETRESET; 519 } 520 521 /* 522 * Committed to changes, install the rate setting. 523 */ 524 if (ic->ic_fixed_rate != i) { 525 ic->ic_fixed_rate = i; /* set fixed tx rate */ 526 error = ENETRESET; 527 } 528 529 /* 530 * Handle operating mode change. 531 */ 532 if (ic->ic_opmode != newopmode) { 533 ic->ic_opmode = newopmode; 534 switch (newopmode) { 535 case IEEE80211_M_AHDEMO: 536 case IEEE80211_M_HOSTAP: 537 case IEEE80211_M_STA: 538 case IEEE80211_M_MONITOR: 539 ic->ic_flags &= ~IEEE80211_F_IBSSON; 540 break; 541 case IEEE80211_M_IBSS: 542 ic->ic_flags |= IEEE80211_F_IBSSON; 543 #ifdef notdef 544 if (ic->ic_curmode == IEEE80211_MODE_11G) 545 ieee80211_set11gbasicrates( 546 &ic->ic_suprates[newphymode], 547 IEEE80211_MODE_11B); 548 #endif 549 break; 550 } 551 error = ENETRESET; 552 } 553 #ifdef notdef 554 if (error == 0) 555 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 556 #endif 557 return error; 558 } 559 560 void 561 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 562 { 563 struct ieee80211com *ic = (void *)ifp; 564 struct ieee80211_node *ni = NULL; 565 566 imr->ifm_status = IFM_AVALID; 567 imr->ifm_active = IFM_IEEE80211; 568 if (ic->ic_state == IEEE80211_S_RUN) 569 imr->ifm_status |= IFM_ACTIVE; 570 imr->ifm_active |= IFM_AUTO; 571 switch (ic->ic_opmode) { 572 case IEEE80211_M_STA: 573 ni = ic->ic_bss; 574 /* calculate rate subtype */ 575 imr->ifm_active |= ieee80211_rate2media(ic, 576 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 577 break; 578 case IEEE80211_M_IBSS: 579 imr->ifm_active |= IFM_IEEE80211_ADHOC; 580 break; 581 case IEEE80211_M_AHDEMO: 582 /* should not come here */ 583 break; 584 case IEEE80211_M_HOSTAP: 585 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 586 break; 587 case IEEE80211_M_MONITOR: 588 imr->ifm_active |= IFM_IEEE80211_MONITOR; 589 break; 590 } 591 switch (ic->ic_curmode) { 592 case IEEE80211_MODE_11A: 593 imr->ifm_active |= IFM_IEEE80211_11A; 594 break; 595 case IEEE80211_MODE_11B: 596 imr->ifm_active |= IFM_IEEE80211_11B; 597 break; 598 case IEEE80211_MODE_11G: 599 imr->ifm_active |= IFM_IEEE80211_11G; 600 break; 601 case IEEE80211_MODE_FH: 602 imr->ifm_active |= IFM_IEEE80211_FH; 603 break; 604 case IEEE80211_MODE_TURBO: 605 imr->ifm_active |= IFM_IEEE80211_11A 606 | IFM_IEEE80211_TURBO; 607 break; 608 } 609 } 610 611 void 612 ieee80211_watchdog(struct ifnet *ifp) 613 { 614 struct ieee80211com *ic = (void *)ifp; 615 616 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 617 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 618 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 619 ieee80211_timeout_nodes(ic); 620 621 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 622 ifp->if_timer = 1; 623 } 624 625 /* 626 * Mark the basic rates for the 11g rate table based on the 627 * operating mode. For real 11g we mark all the 11b rates 628 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 629 * 11b rates. There's also a pseudo 11a-mode used to mark only 630 * the basic OFDM rates. 631 */ 632 static void 633 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 634 { 635 static const struct ieee80211_rateset basic[] = { 636 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 637 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 638 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 639 { 0 }, /* IEEE80211_MODE_FH */ 640 { 0 }, /* IEEE80211_MODE_TURBO */ 641 }; 642 int i, j; 643 644 for (i = 0; i < rs->rs_nrates; i++) { 645 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 646 for (j = 0; j < basic[mode].rs_nrates; j++) 647 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 648 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 649 break; 650 } 651 } 652 } 653 654 /* 655 * Set the current phy mode and recalculate the active channel 656 * set based on the available channels for this mode. Also 657 * select a new default/current channel if the current one is 658 * inappropriate for this mode. 659 */ 660 int 661 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 662 { 663 #define N(a) (sizeof(a) / sizeof(a[0])) 664 static const u_int chanflags[] = { 665 0, /* IEEE80211_MODE_AUTO */ 666 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 667 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 668 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 669 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 670 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 671 }; 672 struct ieee80211_channel *c; 673 u_int modeflags; 674 int i; 675 676 /* validate new mode */ 677 if ((ic->ic_modecaps & (1<<mode)) == 0) { 678 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 679 __func__, mode, ic->ic_modecaps)); 680 return EINVAL; 681 } 682 683 /* 684 * Verify at least one channel is present in the available 685 * channel list before committing to the new mode. 686 */ 687 KASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode)); 688 modeflags = chanflags[mode]; 689 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 690 c = &ic->ic_channels[i]; 691 if (mode == IEEE80211_MODE_AUTO) { 692 /* ignore turbo channels for autoselect */ 693 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 694 break; 695 } else { 696 if ((c->ic_flags & modeflags) == modeflags) 697 break; 698 } 699 } 700 if (i > IEEE80211_CHAN_MAX) { 701 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 702 __func__, mode)); 703 return EINVAL; 704 } 705 706 /* 707 * Calculate the active channel set. 708 */ 709 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 710 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 711 c = &ic->ic_channels[i]; 712 if (mode == IEEE80211_MODE_AUTO) { 713 /* take anything but pure turbo channels */ 714 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 715 setbit(ic->ic_chan_active, i); 716 } else { 717 if ((c->ic_flags & modeflags) == modeflags) 718 setbit(ic->ic_chan_active, i); 719 } 720 } 721 /* 722 * If no current/default channel is setup or the current 723 * channel is wrong for the mode then pick the first 724 * available channel from the active list. This is likely 725 * not the right one. 726 */ 727 if (ic->ic_ibss_chan == NULL || 728 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 729 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 730 if (isset(ic->ic_chan_active, i)) { 731 ic->ic_ibss_chan = &ic->ic_channels[i]; 732 break; 733 } 734 KASSERT(ic->ic_ibss_chan != NULL && 735 isset(ic->ic_chan_active, 736 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 737 ("Bad IBSS channel %u\n", 738 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 739 } 740 741 /* 742 * Set/reset state flags that influence beacon contents, etc. 743 * 744 * XXX what if we have stations already associated??? 745 * XXX probably not right for autoselect? 746 */ 747 if (mode == IEEE80211_MODE_11G) { 748 if (ic->ic_caps & IEEE80211_C_SHSLOT) 749 ic->ic_flags |= IEEE80211_F_SHSLOT; 750 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 751 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 752 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 753 IEEE80211_MODE_11G); 754 } else { 755 ic->ic_flags &= ~(IEEE80211_F_SHSLOT | IEEE80211_F_SHPREAMBLE); 756 } 757 758 ic->ic_curmode = mode; 759 return 0; 760 #undef N 761 } 762 763 /* 764 * Return the phy mode for with the specified channel so the 765 * caller can select a rate set. This is problematic and the 766 * work here assumes how things work elsewhere in this code. 767 * 768 * XXX never returns turbo modes -dcy 769 */ 770 enum ieee80211_phymode 771 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 772 { 773 /* 774 * NB: this assumes the channel would not be supplied to us 775 * unless it was already compatible with the current mode. 776 */ 777 if (ic->ic_curmode != IEEE80211_MODE_AUTO) 778 return ic->ic_curmode; 779 /* 780 * In autoselect mode; deduce a mode based on the channel 781 * characteristics. We assume that turbo-only channels 782 * are not considered when the channel set is constructed. 783 */ 784 if (IEEE80211_IS_CHAN_5GHZ(chan)) 785 return IEEE80211_MODE_11A; 786 else if (IEEE80211_IS_CHAN_FHSS(chan)) 787 return IEEE80211_MODE_FH; 788 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 789 return IEEE80211_MODE_11G; 790 else 791 return IEEE80211_MODE_11B; 792 } 793 794 /* 795 * convert IEEE80211 rate value to ifmedia subtype. 796 * ieee80211 rate is in unit of 0.5Mbps. 797 */ 798 int 799 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 800 { 801 #define N(a) (sizeof(a) / sizeof(a[0])) 802 static const struct { 803 u_int m; /* rate + mode */ 804 u_int r; /* if_media rate */ 805 } rates[] = { 806 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 807 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 808 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 809 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 810 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 811 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 812 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 813 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 814 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 815 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 816 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 817 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 818 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 819 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 820 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 821 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 822 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 823 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 824 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 825 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 826 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 827 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 828 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 829 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 830 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 831 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 832 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 833 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 834 }; 835 u_int mask, i; 836 837 mask = rate & IEEE80211_RATE_VAL; 838 switch (mode) { 839 case IEEE80211_MODE_11A: 840 case IEEE80211_MODE_TURBO: 841 mask |= IFM_IEEE80211_11A; 842 break; 843 case IEEE80211_MODE_11B: 844 mask |= IFM_IEEE80211_11B; 845 break; 846 case IEEE80211_MODE_FH: 847 mask |= IFM_IEEE80211_FH; 848 break; 849 case IEEE80211_MODE_11G: 850 mask |= IFM_IEEE80211_11G; 851 break; 852 case IEEE80211_MODE_AUTO: 853 switch (ic->ic_phytype) { 854 case IEEE80211_T_FH: 855 mask |= IFM_IEEE80211_FH; 856 break; 857 case IEEE80211_T_DS: 858 mask |= IFM_IEEE80211_11B; 859 break; 860 case IEEE80211_T_OFDM: 861 case IEEE80211_T_TURBO: 862 mask |= IFM_IEEE80211_11G; 863 break; 864 } 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 #endif 940
Indexes created Mon Sep 22 13:09:51 GMT 2025