ieee80211.c revision 1.1.1.4
1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2005 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 1.19 2005/01/27 17:39:17 sam Exp $"); 35 36 /* 37 * IEEE 802.11 generic handler 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 44 #include <sys/socket.h> 45 46 #include <net/if.h> 47 #include <net/if_media.h> 48 #include <net/ethernet.h> 49 50 #include <net80211/ieee80211_var.h> 51 52 #include <net/bpf.h> 53 54 const char *ieee80211_phymode_name[] = { 55 "auto", /* IEEE80211_MODE_AUTO */ 56 "11a", /* IEEE80211_MODE_11A */ 57 "11b", /* IEEE80211_MODE_11B */ 58 "11g", /* IEEE80211_MODE_11G */ 59 "FH", /* IEEE80211_MODE_FH */ 60 "turboA", /* IEEE80211_MODE_TURBO_A */ 61 "turboG", /* IEEE80211_MODE_TURBO_G */ 62 }; 63 64 /* list of all instances */ 65 SLIST_HEAD(ieee80211_list, ieee80211com); 66 static struct ieee80211_list ieee80211_list = 67 SLIST_HEAD_INITIALIZER(ieee80211_list); 68 static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 69 static struct mtx ieee80211_vap_mtx; 70 MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF); 71 72 static void 73 ieee80211_add_vap(struct ieee80211com *ic) 74 { 75 #define N(a) (sizeof(a)/sizeof(a[0])) 76 int i; 77 u_int8_t b; 78 79 mtx_lock(&ieee80211_vap_mtx); 80 ic->ic_vap = 0; 81 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 82 ic->ic_vap += NBBY; 83 if (i == N(ieee80211_vapmap)) 84 panic("vap table full"); 85 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 86 ic->ic_vap++; 87 setbit(ieee80211_vapmap, ic->ic_vap); 88 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 89 mtx_unlock(&ieee80211_vap_mtx); 90 #undef N 91 } 92 93 static void 94 ieee80211_remove_vap(struct ieee80211com *ic) 95 { 96 mtx_lock(&ieee80211_vap_mtx); 97 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 98 KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 99 ("invalid vap id %d", ic->ic_vap)); 100 KASSERT(isset(ieee80211_vapmap, ic->ic_vap), 101 ("vap id %d not allocated", ic->ic_vap)); 102 clrbit(ieee80211_vapmap, ic->ic_vap); 103 mtx_unlock(&ieee80211_vap_mtx); 104 } 105 106 /* 107 * Default reset method for use with the ioctl support. This 108 * method is invoked after any state change in the 802.11 109 * layer that should be propagated to the hardware but not 110 * require re-initialization of the 802.11 state machine (e.g 111 * rescanning for an ap). We always return ENETRESET which 112 * should cause the driver to re-initialize the device. Drivers 113 * can override this method to implement more optimized support. 114 */ 115 static int 116 ieee80211_default_reset(struct ifnet *ifp) 117 { 118 return ENETRESET; 119 } 120 121 void 122 ieee80211_ifattach(struct ieee80211com *ic) 123 { 124 struct ifnet *ifp = ic->ic_ifp; 125 struct ieee80211_channel *c; 126 int i; 127 128 ether_ifattach(ifp, ic->ic_myaddr); 129 bpfattach2(ifp, DLT_IEEE802_11, 130 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 131 132 ieee80211_crypto_attach(ic); 133 134 /* 135 * Fill in 802.11 available channel set, mark 136 * all available channels as active, and pick 137 * a default channel if not already specified. 138 */ 139 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 140 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 141 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 142 c = &ic->ic_channels[i]; 143 if (c->ic_flags) { 144 /* 145 * Verify driver passed us valid data. 146 */ 147 if (i != ieee80211_chan2ieee(ic, c)) { 148 if_printf(ifp, "bad channel ignored; " 149 "freq %u flags %x number %u\n", 150 c->ic_freq, c->ic_flags, i); 151 c->ic_flags = 0; /* NB: remove */ 152 continue; 153 } 154 setbit(ic->ic_chan_avail, i); 155 /* 156 * Identify mode capabilities. 157 */ 158 if (IEEE80211_IS_CHAN_A(c)) 159 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 160 if (IEEE80211_IS_CHAN_B(c)) 161 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 162 if (IEEE80211_IS_CHAN_PUREG(c)) 163 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 164 if (IEEE80211_IS_CHAN_FHSS(c)) 165 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 166 if (IEEE80211_IS_CHAN_T(c)) 167 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 168 if (IEEE80211_IS_CHAN_108G(c)) 169 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 170 } 171 } 172 /* validate ic->ic_curmode */ 173 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 174 ic->ic_curmode = IEEE80211_MODE_AUTO; 175 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 176 #if 0 177 /* 178 * Enable WME by default if we're capable. 179 */ 180 if (ic->ic_caps & IEEE80211_C_WME) 181 ic->ic_flags |= IEEE80211_F_WME; 182 #endif 183 (void) ieee80211_setmode(ic, ic->ic_curmode); 184 185 if (ic->ic_lintval == 0) 186 ic->ic_lintval = IEEE80211_BINTVAL_DEFAULT; 187 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 188 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 189 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 190 191 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 192 193 ieee80211_node_attach(ic); 194 ieee80211_proto_attach(ic); 195 196 ieee80211_add_vap(ic); 197 198 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 199 200 /* 201 * Install a default reset method for the ioctl support. 202 * The driver is expected to fill this in before calling us. 203 */ 204 if (ic->ic_reset == NULL) 205 ic->ic_reset = ieee80211_default_reset; 206 } 207 208 void 209 ieee80211_ifdetach(struct ieee80211com *ic) 210 { 211 struct ifnet *ifp = ic->ic_ifp; 212 213 ieee80211_remove_vap(ic); 214 215 ieee80211_sysctl_detach(ic); 216 ieee80211_proto_detach(ic); 217 ieee80211_crypto_detach(ic); 218 ieee80211_node_detach(ic); 219 ifmedia_removeall(&ic->ic_media); 220 221 IEEE80211_BEACON_LOCK_DESTROY(ic); 222 223 bpfdetach(ifp); 224 ether_ifdetach(ifp); 225 } 226 227 /* 228 * Convert MHz frequency to IEEE channel number. 229 */ 230 u_int 231 ieee80211_mhz2ieee(u_int freq, u_int flags) 232 { 233 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 234 if (freq == 2484) 235 return 14; 236 if (freq < 2484) 237 return (freq - 2407) / 5; 238 else 239 return 15 + ((freq - 2512) / 20); 240 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 241 return (freq - 5000) / 5; 242 } else { /* either, guess */ 243 if (freq == 2484) 244 return 14; 245 if (freq < 2484) 246 return (freq - 2407) / 5; 247 if (freq < 5000) 248 return 15 + ((freq - 2512) / 20); 249 return (freq - 5000) / 5; 250 } 251 } 252 253 /* 254 * Convert channel to IEEE channel number. 255 */ 256 u_int 257 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 258 { 259 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 260 return c - ic->ic_channels; 261 else if (c == IEEE80211_CHAN_ANYC) 262 return IEEE80211_CHAN_ANY; 263 else if (c != NULL) { 264 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 265 c->ic_freq, c->ic_flags); 266 return 0; /* XXX */ 267 } else { 268 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 269 return 0; /* XXX */ 270 } 271 } 272 273 /* 274 * Convert IEEE channel number to MHz frequency. 275 */ 276 u_int 277 ieee80211_ieee2mhz(u_int chan, u_int flags) 278 { 279 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 280 if (chan == 14) 281 return 2484; 282 if (chan < 14) 283 return 2407 + chan*5; 284 else 285 return 2512 + ((chan-15)*20); 286 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 287 return 5000 + (chan*5); 288 } else { /* either, guess */ 289 if (chan == 14) 290 return 2484; 291 if (chan < 14) /* 0-13 */ 292 return 2407 + chan*5; 293 if (chan < 27) /* 15-26 */ 294 return 2512 + ((chan-15)*20); 295 return 5000 + (chan*5); 296 } 297 } 298 299 /* 300 * Setup the media data structures according to the channel and 301 * rate tables. This must be called by the driver after 302 * ieee80211_attach and before most anything else. 303 */ 304 void 305 ieee80211_media_init(struct ieee80211com *ic, 306 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 307 { 308 #define ADD(_ic, _s, _o) \ 309 ifmedia_add(&(_ic)->ic_media, \ 310 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 311 struct ifnet *ifp = ic->ic_ifp; 312 struct ifmediareq imr; 313 int i, j, mode, rate, maxrate, mword, mopt, r; 314 struct ieee80211_rateset *rs; 315 struct ieee80211_rateset allrates; 316 317 /* 318 * Do late attach work that must wait for any subclass 319 * (i.e. driver) work such as overriding methods. 320 */ 321 ieee80211_node_lateattach(ic); 322 323 /* 324 * Fill in media characteristics. 325 */ 326 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 327 maxrate = 0; 328 memset(&allrates, 0, sizeof(allrates)); 329 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 330 static const u_int mopts[] = { 331 IFM_AUTO, 332 IFM_IEEE80211_11A, 333 IFM_IEEE80211_11B, 334 IFM_IEEE80211_11G, 335 IFM_IEEE80211_FH, 336 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 337 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 338 }; 339 if ((ic->ic_modecaps & (1<<mode)) == 0) 340 continue; 341 mopt = mopts[mode]; 342 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 343 if (ic->ic_caps & IEEE80211_C_IBSS) 344 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 345 if (ic->ic_caps & IEEE80211_C_HOSTAP) 346 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 347 if (ic->ic_caps & IEEE80211_C_AHDEMO) 348 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 349 if (ic->ic_caps & IEEE80211_C_MONITOR) 350 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 351 if (mode == IEEE80211_MODE_AUTO) 352 continue; 353 rs = &ic->ic_sup_rates[mode]; 354 for (i = 0; i < rs->rs_nrates; i++) { 355 rate = rs->rs_rates[i]; 356 mword = ieee80211_rate2media(ic, rate, mode); 357 if (mword == 0) 358 continue; 359 ADD(ic, mword, mopt); 360 if (ic->ic_caps & IEEE80211_C_IBSS) 361 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 362 if (ic->ic_caps & IEEE80211_C_HOSTAP) 363 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 364 if (ic->ic_caps & IEEE80211_C_AHDEMO) 365 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 366 if (ic->ic_caps & IEEE80211_C_MONITOR) 367 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 368 /* 369 * Add rate to the collection of all rates. 370 */ 371 r = rate & IEEE80211_RATE_VAL; 372 for (j = 0; j < allrates.rs_nrates; j++) 373 if (allrates.rs_rates[j] == r) 374 break; 375 if (j == allrates.rs_nrates) { 376 /* unique, add to the set */ 377 allrates.rs_rates[j] = r; 378 allrates.rs_nrates++; 379 } 380 rate = (rate & IEEE80211_RATE_VAL) / 2; 381 if (rate > maxrate) 382 maxrate = rate; 383 } 384 } 385 for (i = 0; i < allrates.rs_nrates; i++) { 386 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 387 IEEE80211_MODE_AUTO); 388 if (mword == 0) 389 continue; 390 mword = IFM_SUBTYPE(mword); /* remove media options */ 391 ADD(ic, mword, 0); 392 if (ic->ic_caps & IEEE80211_C_IBSS) 393 ADD(ic, mword, IFM_IEEE80211_ADHOC); 394 if (ic->ic_caps & IEEE80211_C_HOSTAP) 395 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 396 if (ic->ic_caps & IEEE80211_C_AHDEMO) 397 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 398 if (ic->ic_caps & IEEE80211_C_MONITOR) 399 ADD(ic, mword, IFM_IEEE80211_MONITOR); 400 } 401 ieee80211_media_status(ifp, &imr); 402 ifmedia_set(&ic->ic_media, imr.ifm_active); 403 404 if (maxrate) 405 ifp->if_baudrate = IF_Mbps(maxrate); 406 #undef ADD 407 } 408 409 void 410 ieee80211_announce(struct ieee80211com *ic) 411 { 412 struct ifnet *ifp = ic->ic_ifp; 413 int i, mode, rate, mword; 414 struct ieee80211_rateset *rs; 415 416 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 417 if ((ic->ic_modecaps & (1<<mode)) == 0) 418 continue; 419 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 420 rs = &ic->ic_sup_rates[mode]; 421 for (i = 0; i < rs->rs_nrates; i++) { 422 rate = rs->rs_rates[i]; 423 mword = ieee80211_rate2media(ic, rate, mode); 424 if (mword == 0) 425 continue; 426 printf("%s%d%sMbps", (i != 0 ? " " : ""), 427 (rate & IEEE80211_RATE_VAL) / 2, 428 ((rate & 0x1) != 0 ? ".5" : "")); 429 } 430 printf("\n"); 431 } 432 } 433 434 static int 435 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 436 { 437 #define IEEERATE(_ic,_m,_i) \ 438 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 439 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 440 for (i = 0; i < nrates; i++) 441 if (IEEERATE(ic, mode, i) == rate) 442 return i; 443 return -1; 444 #undef IEEERATE 445 } 446 447 /* 448 * Find an instance by it's mac address. 449 */ 450 struct ieee80211com * 451 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 452 { 453 struct ieee80211com *ic; 454 455 /* XXX lock */ 456 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 457 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 458 return ic; 459 return NULL; 460 } 461 462 static struct ieee80211com * 463 ieee80211_find_instance(struct ifnet *ifp) 464 { 465 struct ieee80211com *ic; 466 467 /* XXX lock */ 468 /* XXX not right for multiple instances but works for now */ 469 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 470 if (ic->ic_ifp == ifp) 471 return ic; 472 return NULL; 473 } 474 475 /* 476 * Handle a media change request. 477 */ 478 int 479 ieee80211_media_change(struct ifnet *ifp) 480 { 481 struct ieee80211com *ic; 482 struct ifmedia_entry *ime; 483 enum ieee80211_opmode newopmode; 484 enum ieee80211_phymode newphymode; 485 int i, j, newrate, error = 0; 486 487 ic = ieee80211_find_instance(ifp); 488 if (!ic) { 489 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 490 return EINVAL; 491 } 492 ime = ic->ic_media.ifm_cur; 493 /* 494 * First, identify the phy mode. 495 */ 496 switch (IFM_MODE(ime->ifm_media)) { 497 case IFM_IEEE80211_11A: 498 newphymode = IEEE80211_MODE_11A; 499 break; 500 case IFM_IEEE80211_11B: 501 newphymode = IEEE80211_MODE_11B; 502 break; 503 case IFM_IEEE80211_11G: 504 newphymode = IEEE80211_MODE_11G; 505 break; 506 case IFM_IEEE80211_FH: 507 newphymode = IEEE80211_MODE_FH; 508 break; 509 case IFM_AUTO: 510 newphymode = IEEE80211_MODE_AUTO; 511 break; 512 default: 513 return EINVAL; 514 } 515 /* 516 * Turbo mode is an ``option''. 517 * XXX does not apply to AUTO 518 */ 519 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 520 if (newphymode == IEEE80211_MODE_11A) 521 newphymode = IEEE80211_MODE_TURBO_A; 522 else if (newphymode == IEEE80211_MODE_11G) 523 newphymode = IEEE80211_MODE_TURBO_G; 524 else 525 return EINVAL; 526 } 527 /* 528 * Validate requested mode is available. 529 */ 530 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 531 return EINVAL; 532 533 /* 534 * Next, the fixed/variable rate. 535 */ 536 i = -1; 537 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 538 /* 539 * Convert media subtype to rate. 540 */ 541 newrate = ieee80211_media2rate(ime->ifm_media); 542 if (newrate == 0) 543 return EINVAL; 544 /* 545 * Check the rate table for the specified/current phy. 546 */ 547 if (newphymode == IEEE80211_MODE_AUTO) { 548 /* 549 * In autoselect mode search for the rate. 550 */ 551 for (j = IEEE80211_MODE_11A; 552 j < IEEE80211_MODE_MAX; j++) { 553 if ((ic->ic_modecaps & (1<<j)) == 0) 554 continue; 555 i = findrate(ic, j, newrate); 556 if (i != -1) { 557 /* lock mode too */ 558 newphymode = j; 559 break; 560 } 561 } 562 } else { 563 i = findrate(ic, newphymode, newrate); 564 } 565 if (i == -1) /* mode/rate mismatch */ 566 return EINVAL; 567 } 568 /* NB: defer rate setting to later */ 569 570 /* 571 * Deduce new operating mode but don't install it just yet. 572 */ 573 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 574 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 575 newopmode = IEEE80211_M_AHDEMO; 576 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 577 newopmode = IEEE80211_M_HOSTAP; 578 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 579 newopmode = IEEE80211_M_IBSS; 580 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 581 newopmode = IEEE80211_M_MONITOR; 582 else 583 newopmode = IEEE80211_M_STA; 584 585 /* 586 * Autoselect doesn't make sense when operating as an AP. 587 * If no phy mode has been selected, pick one and lock it 588 * down so rate tables can be used in forming beacon frames 589 * and the like. 590 */ 591 if (newopmode == IEEE80211_M_HOSTAP && 592 newphymode == IEEE80211_MODE_AUTO) { 593 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 594 if (ic->ic_modecaps & (1<<j)) { 595 newphymode = j; 596 break; 597 } 598 } 599 600 /* 601 * Handle phy mode change. 602 */ 603 if (ic->ic_curmode != newphymode) { /* change phy mode */ 604 error = ieee80211_setmode(ic, newphymode); 605 if (error != 0) 606 return error; 607 error = ENETRESET; 608 } 609 610 /* 611 * Committed to changes, install the rate setting. 612 */ 613 if (ic->ic_fixed_rate != i) { 614 ic->ic_fixed_rate = i; /* set fixed tx rate */ 615 error = ENETRESET; 616 } 617 618 /* 619 * Handle operating mode change. 620 */ 621 if (ic->ic_opmode != newopmode) { 622 ic->ic_opmode = newopmode; 623 switch (newopmode) { 624 case IEEE80211_M_AHDEMO: 625 case IEEE80211_M_HOSTAP: 626 case IEEE80211_M_STA: 627 case IEEE80211_M_MONITOR: 628 ic->ic_flags &= ~IEEE80211_F_IBSSON; 629 break; 630 case IEEE80211_M_IBSS: 631 ic->ic_flags |= IEEE80211_F_IBSSON; 632 break; 633 } 634 /* 635 * Yech, slot time may change depending on the 636 * operating mode so reset it to be sure everything 637 * is setup appropriately. 638 */ 639 ieee80211_reset_erp(ic); 640 ieee80211_wme_initparams(ic); /* after opmode change */ 641 error = ENETRESET; 642 } 643 #ifdef notdef 644 if (error == 0) 645 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 646 #endif 647 return error; 648 } 649 650 void 651 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 652 { 653 struct ieee80211com *ic; 654 struct ieee80211_rateset *rs; 655 656 ic = ieee80211_find_instance(ifp); 657 if (!ic) { 658 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 659 return; 660 } 661 imr->ifm_status = IFM_AVALID; 662 imr->ifm_active = IFM_IEEE80211; 663 if (ic->ic_state == IEEE80211_S_RUN) 664 imr->ifm_status |= IFM_ACTIVE; 665 /* 666 * Calculate a current rate if possible. 667 */ 668 if (ic->ic_fixed_rate != -1) { 669 /* 670 * A fixed rate is set, report that. 671 */ 672 rs = &ic->ic_sup_rates[ic->ic_curmode]; 673 imr->ifm_active |= ieee80211_rate2media(ic, 674 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 675 } else if (ic->ic_opmode == IEEE80211_M_STA) { 676 /* 677 * In station mode report the current transmit rate. 678 */ 679 rs = &ic->ic_bss->ni_rates; 680 imr->ifm_active |= ieee80211_rate2media(ic, 681 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 682 } else 683 imr->ifm_active |= IFM_AUTO; 684 switch (ic->ic_opmode) { 685 case IEEE80211_M_STA: 686 break; 687 case IEEE80211_M_IBSS: 688 imr->ifm_active |= IFM_IEEE80211_ADHOC; 689 break; 690 case IEEE80211_M_AHDEMO: 691 /* should not come here */ 692 break; 693 case IEEE80211_M_HOSTAP: 694 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 695 break; 696 case IEEE80211_M_MONITOR: 697 imr->ifm_active |= IFM_IEEE80211_MONITOR; 698 break; 699 } 700 switch (ic->ic_curmode) { 701 case IEEE80211_MODE_11A: 702 imr->ifm_active |= IFM_IEEE80211_11A; 703 break; 704 case IEEE80211_MODE_11B: 705 imr->ifm_active |= IFM_IEEE80211_11B; 706 break; 707 case IEEE80211_MODE_11G: 708 imr->ifm_active |= IFM_IEEE80211_11G; 709 break; 710 case IEEE80211_MODE_FH: 711 imr->ifm_active |= IFM_IEEE80211_FH; 712 break; 713 case IEEE80211_MODE_TURBO_A: 714 imr->ifm_active |= IFM_IEEE80211_11A 715 | IFM_IEEE80211_TURBO; 716 break; 717 case IEEE80211_MODE_TURBO_G: 718 imr->ifm_active |= IFM_IEEE80211_11G 719 | IFM_IEEE80211_TURBO; 720 break; 721 } 722 } 723 724 void 725 ieee80211_watchdog(struct ieee80211com *ic) 726 { 727 struct ieee80211_node_table *nt; 728 int need_inact_timer = 0; 729 730 if (ic->ic_state != IEEE80211_S_INIT) { 731 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 732 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 733 nt = &ic->ic_scan; 734 if (nt->nt_inact_timer) { 735 if (--nt->nt_inact_timer == 0) 736 nt->nt_timeout(nt); 737 need_inact_timer += nt->nt_inact_timer; 738 } 739 nt = &ic->ic_sta; 740 if (nt->nt_inact_timer) { 741 if (--nt->nt_inact_timer == 0) 742 nt->nt_timeout(nt); 743 need_inact_timer += nt->nt_inact_timer; 744 } 745 } 746 if (ic->ic_mgt_timer != 0 || need_inact_timer) 747 ic->ic_ifp->if_timer = 1; 748 } 749 750 /* 751 * Set the current phy mode and recalculate the active channel 752 * set based on the available channels for this mode. Also 753 * select a new default/current channel if the current one is 754 * inappropriate for this mode. 755 */ 756 int 757 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 758 { 759 #define N(a) (sizeof(a) / sizeof(a[0])) 760 static const u_int chanflags[] = { 761 0, /* IEEE80211_MODE_AUTO */ 762 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 763 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 764 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 765 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 766 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 767 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 768 }; 769 struct ieee80211_channel *c; 770 u_int modeflags; 771 int i; 772 773 /* validate new mode */ 774 if ((ic->ic_modecaps & (1<<mode)) == 0) { 775 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 776 "%s: mode %u not supported (caps 0x%x)\n", 777 __func__, mode, ic->ic_modecaps); 778 return EINVAL; 779 } 780 781 /* 782 * Verify at least one channel is present in the available 783 * channel list before committing to the new mode. 784 */ 785 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 786 modeflags = chanflags[mode]; 787 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 788 c = &ic->ic_channels[i]; 789 if (mode == IEEE80211_MODE_AUTO) { 790 /* ignore turbo channels for autoselect */ 791 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 792 break; 793 } else { 794 if ((c->ic_flags & modeflags) == modeflags) 795 break; 796 } 797 } 798 if (i > IEEE80211_CHAN_MAX) { 799 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 800 "%s: no channels found for mode %u\n", __func__, mode); 801 return EINVAL; 802 } 803 804 /* 805 * Calculate the active channel set. 806 */ 807 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 808 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 809 c = &ic->ic_channels[i]; 810 if (mode == IEEE80211_MODE_AUTO) { 811 /* take anything but pure turbo channels */ 812 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 813 setbit(ic->ic_chan_active, i); 814 } else { 815 if ((c->ic_flags & modeflags) == modeflags) 816 setbit(ic->ic_chan_active, i); 817 } 818 } 819 /* 820 * If no current/default channel is setup or the current 821 * channel is wrong for the mode then pick the first 822 * available channel from the active list. This is likely 823 * not the right one. 824 */ 825 if (ic->ic_ibss_chan == NULL || 826 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 827 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 828 if (isset(ic->ic_chan_active, i)) { 829 ic->ic_ibss_chan = &ic->ic_channels[i]; 830 break; 831 } 832 KASSERT(ic->ic_ibss_chan != NULL && 833 isset(ic->ic_chan_active, 834 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 835 ("Bad IBSS channel %u", 836 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 837 } 838 /* 839 * If the desired channel is set but no longer valid then reset it. 840 */ 841 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 842 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 843 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 844 845 /* 846 * Do mode-specific rate setup. 847 */ 848 if (mode == IEEE80211_MODE_11G) { 849 /* 850 * Use a mixed 11b/11g rate set. 851 */ 852 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 853 IEEE80211_MODE_11G); 854 } else if (mode == IEEE80211_MODE_11B) { 855 /* 856 * Force pure 11b rate set. 857 */ 858 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 859 IEEE80211_MODE_11B); 860 } 861 /* 862 * Setup an initial rate set according to the 863 * current/default channel selected above. This 864 * will be changed when scanning but must exist 865 * now so driver have a consistent state of ic_ibss_chan. 866 */ 867 if (ic->ic_bss) /* NB: can be called before lateattach */ 868 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 869 870 ic->ic_curmode = mode; 871 ieee80211_reset_erp(ic); /* reset ERP state */ 872 ieee80211_wme_initparams(ic); /* reset WME stat */ 873 874 return 0; 875 #undef N 876 } 877 878 /* 879 * Return the phy mode for with the specified channel so the 880 * caller can select a rate set. This is problematic for channels 881 * where multiple operating modes are possible (e.g. 11g+11b). 882 * In those cases we defer to the current operating mode when set. 883 */ 884 enum ieee80211_phymode 885 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 886 { 887 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 888 /* 889 * This assumes all 11a turbo channels are also 890 * usable withut turbo, which is currently true. 891 */ 892 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A) 893 return IEEE80211_MODE_TURBO_A; 894 return IEEE80211_MODE_11A; 895 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 896 return IEEE80211_MODE_FH; 897 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 898 /* 899 * This assumes all 11g channels are also usable 900 * for 11b, which is currently true. 901 */ 902 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 903 return IEEE80211_MODE_TURBO_G; 904 if (ic->ic_curmode == IEEE80211_MODE_11B) 905 return IEEE80211_MODE_11B; 906 return IEEE80211_MODE_11G; 907 } else 908 return IEEE80211_MODE_11B; 909 } 910 911 /* 912 * convert IEEE80211 rate value to ifmedia subtype. 913 * ieee80211 rate is in unit of 0.5Mbps. 914 */ 915 int 916 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 917 { 918 #define N(a) (sizeof(a) / sizeof(a[0])) 919 static const struct { 920 u_int m; /* rate + mode */ 921 u_int r; /* if_media rate */ 922 } rates[] = { 923 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 924 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 925 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 926 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 927 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 928 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 929 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 930 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 931 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 932 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 933 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 934 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 935 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 936 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 937 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 938 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 939 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 940 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 941 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 942 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 943 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 944 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 945 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 946 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 947 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 948 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 949 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 950 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 951 }; 952 u_int mask, i; 953 954 mask = rate & IEEE80211_RATE_VAL; 955 switch (mode) { 956 case IEEE80211_MODE_11A: 957 case IEEE80211_MODE_TURBO_A: 958 mask |= IFM_IEEE80211_11A; 959 break; 960 case IEEE80211_MODE_11B: 961 mask |= IFM_IEEE80211_11B; 962 break; 963 case IEEE80211_MODE_FH: 964 mask |= IFM_IEEE80211_FH; 965 break; 966 case IEEE80211_MODE_AUTO: 967 /* NB: ic may be NULL for some drivers */ 968 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 969 mask |= IFM_IEEE80211_FH; 970 break; 971 } 972 /* NB: hack, 11g matches both 11b+11a rates */ 973 /* fall thru... */ 974 case IEEE80211_MODE_11G: 975 case IEEE80211_MODE_TURBO_G: 976 mask |= IFM_IEEE80211_11G; 977 break; 978 } 979 for (i = 0; i < N(rates); i++) 980 if (rates[i].m == mask) 981 return rates[i].r; 982 return IFM_AUTO; 983 #undef N 984 } 985 986 int 987 ieee80211_media2rate(int mword) 988 { 989 #define N(a) (sizeof(a) / sizeof(a[0])) 990 static const int ieeerates[] = { 991 -1, /* IFM_AUTO */ 992 0, /* IFM_MANUAL */ 993 0, /* IFM_NONE */ 994 2, /* IFM_IEEE80211_FH1 */ 995 4, /* IFM_IEEE80211_FH2 */ 996 2, /* IFM_IEEE80211_DS1 */ 997 4, /* IFM_IEEE80211_DS2 */ 998 11, /* IFM_IEEE80211_DS5 */ 999 22, /* IFM_IEEE80211_DS11 */ 1000 44, /* IFM_IEEE80211_DS22 */ 1001 12, /* IFM_IEEE80211_OFDM6 */ 1002 18, /* IFM_IEEE80211_OFDM9 */ 1003 24, /* IFM_IEEE80211_OFDM12 */ 1004 36, /* IFM_IEEE80211_OFDM18 */ 1005 48, /* IFM_IEEE80211_OFDM24 */ 1006 72, /* IFM_IEEE80211_OFDM36 */ 1007 96, /* IFM_IEEE80211_OFDM48 */ 1008 108, /* IFM_IEEE80211_OFDM54 */ 1009 144, /* IFM_IEEE80211_OFDM72 */ 1010 }; 1011 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1012 ieeerates[IFM_SUBTYPE(mword)] : 0; 1013 #undef N 1014 } 1015
Indexes created Thu Oct 02 10:09:58 GMT 2025