Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net80211/ieee80211.c
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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: releng/6.1/sys/net80211/ieee80211.c 156579 2006-03-11 19:25:23Z sam $"); 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 if (ic->ic_curchan == NULL) { 171 /* arbitrarily pick the first channel */ 172 ic->ic_curchan = &ic->ic_channels[i]; 173 } 174 } 175 } 176 /* validate ic->ic_curmode */ 177 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 178 ic->ic_curmode = IEEE80211_MODE_AUTO; 179 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 180 #if 0 181 /* 182 * Enable WME by default if we're capable. 183 */ 184 if (ic->ic_caps & IEEE80211_C_WME) 185 ic->ic_flags |= IEEE80211_F_WME; 186 #endif 187 if (ic->ic_caps & IEEE80211_C_BURST) 188 ic->ic_flags |= IEEE80211_F_BURST; 189 (void) ieee80211_setmode(ic, ic->ic_curmode); 190 191 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 192 ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT; 193 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 194 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 195 196 ic->ic_lintval = ic->ic_bintval; 197 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 198 199 ieee80211_node_attach(ic); 200 ieee80211_proto_attach(ic); 201 202 ieee80211_add_vap(ic); 203 204 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 205 206 /* 207 * Install a default reset method for the ioctl support. 208 * The driver is expected to fill this in before calling us. 209 */ 210 if (ic->ic_reset == NULL) 211 ic->ic_reset = ieee80211_default_reset; 212 } 213 214 void 215 ieee80211_ifdetach(struct ieee80211com *ic) 216 { 217 struct ifnet *ifp = ic->ic_ifp; 218 219 ieee80211_remove_vap(ic); 220 221 ieee80211_sysctl_detach(ic); 222 ieee80211_proto_detach(ic); 223 ieee80211_crypto_detach(ic); 224 ieee80211_node_detach(ic); 225 ifmedia_removeall(&ic->ic_media); 226 227 IEEE80211_BEACON_LOCK_DESTROY(ic); 228 229 bpfdetach(ifp); 230 ether_ifdetach(ifp); 231 } 232 233 /* 234 * Convert MHz frequency to IEEE channel number. 235 */ 236 u_int 237 ieee80211_mhz2ieee(u_int freq, u_int flags) 238 { 239 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 240 if (freq == 2484) 241 return 14; 242 if (freq < 2484) 243 return (freq - 2407) / 5; 244 else 245 return 15 + ((freq - 2512) / 20); 246 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 247 return (freq - 5000) / 5; 248 } else { /* either, guess */ 249 if (freq == 2484) 250 return 14; 251 if (freq < 2484) 252 return (freq - 2407) / 5; 253 if (freq < 5000) 254 return 15 + ((freq - 2512) / 20); 255 return (freq - 5000) / 5; 256 } 257 } 258 259 /* 260 * Convert channel to IEEE channel number. 261 */ 262 u_int 263 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 264 { 265 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 266 return c - ic->ic_channels; 267 else if (c == IEEE80211_CHAN_ANYC) 268 return IEEE80211_CHAN_ANY; 269 else if (c != NULL) { 270 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 271 c->ic_freq, c->ic_flags); 272 return 0; /* XXX */ 273 } else { 274 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 275 return 0; /* XXX */ 276 } 277 } 278 279 /* 280 * Convert IEEE channel number to MHz frequency. 281 */ 282 u_int 283 ieee80211_ieee2mhz(u_int chan, u_int flags) 284 { 285 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 286 if (chan == 14) 287 return 2484; 288 if (chan < 14) 289 return 2407 + chan*5; 290 else 291 return 2512 + ((chan-15)*20); 292 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 293 return 5000 + (chan*5); 294 } else { /* either, guess */ 295 if (chan == 14) 296 return 2484; 297 if (chan < 14) /* 0-13 */ 298 return 2407 + chan*5; 299 if (chan < 27) /* 15-26 */ 300 return 2512 + ((chan-15)*20); 301 return 5000 + (chan*5); 302 } 303 } 304 305 /* 306 * Setup the media data structures according to the channel and 307 * rate tables. This must be called by the driver after 308 * ieee80211_attach and before most anything else. 309 */ 310 void 311 ieee80211_media_init(struct ieee80211com *ic, 312 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 313 { 314 #define ADD(_ic, _s, _o) \ 315 ifmedia_add(&(_ic)->ic_media, \ 316 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 317 struct ifnet *ifp = ic->ic_ifp; 318 struct ifmediareq imr; 319 int i, j, mode, rate, maxrate, mword, mopt, r; 320 struct ieee80211_rateset *rs; 321 struct ieee80211_rateset allrates; 322 323 /* 324 * Do late attach work that must wait for any subclass 325 * (i.e. driver) work such as overriding methods. 326 */ 327 ieee80211_node_lateattach(ic); 328 329 /* 330 * Fill in media characteristics. 331 */ 332 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 333 maxrate = 0; 334 memset(&allrates, 0, sizeof(allrates)); 335 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 336 static const u_int mopts[] = { 337 IFM_AUTO, 338 IFM_IEEE80211_11A, 339 IFM_IEEE80211_11B, 340 IFM_IEEE80211_11G, 341 IFM_IEEE80211_FH, 342 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 343 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 344 }; 345 if ((ic->ic_modecaps & (1<<mode)) == 0) 346 continue; 347 mopt = mopts[mode]; 348 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 349 if (ic->ic_caps & IEEE80211_C_IBSS) 350 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 351 if (ic->ic_caps & IEEE80211_C_HOSTAP) 352 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 353 if (ic->ic_caps & IEEE80211_C_AHDEMO) 354 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 355 if (ic->ic_caps & IEEE80211_C_MONITOR) 356 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 357 if (mode == IEEE80211_MODE_AUTO) 358 continue; 359 rs = &ic->ic_sup_rates[mode]; 360 for (i = 0; i < rs->rs_nrates; i++) { 361 rate = rs->rs_rates[i]; 362 mword = ieee80211_rate2media(ic, rate, mode); 363 if (mword == 0) 364 continue; 365 ADD(ic, mword, mopt); 366 if (ic->ic_caps & IEEE80211_C_IBSS) 367 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 368 if (ic->ic_caps & IEEE80211_C_HOSTAP) 369 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 370 if (ic->ic_caps & IEEE80211_C_AHDEMO) 371 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 372 if (ic->ic_caps & IEEE80211_C_MONITOR) 373 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 374 /* 375 * Add rate to the collection of all rates. 376 */ 377 r = rate & IEEE80211_RATE_VAL; 378 for (j = 0; j < allrates.rs_nrates; j++) 379 if (allrates.rs_rates[j] == r) 380 break; 381 if (j == allrates.rs_nrates) { 382 /* unique, add to the set */ 383 allrates.rs_rates[j] = r; 384 allrates.rs_nrates++; 385 } 386 rate = (rate & IEEE80211_RATE_VAL) / 2; 387 if (rate > maxrate) 388 maxrate = rate; 389 } 390 } 391 for (i = 0; i < allrates.rs_nrates; i++) { 392 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 393 IEEE80211_MODE_AUTO); 394 if (mword == 0) 395 continue; 396 mword = IFM_SUBTYPE(mword); /* remove media options */ 397 ADD(ic, mword, 0); 398 if (ic->ic_caps & IEEE80211_C_IBSS) 399 ADD(ic, mword, IFM_IEEE80211_ADHOC); 400 if (ic->ic_caps & IEEE80211_C_HOSTAP) 401 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 402 if (ic->ic_caps & IEEE80211_C_AHDEMO) 403 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 404 if (ic->ic_caps & IEEE80211_C_MONITOR) 405 ADD(ic, mword, IFM_IEEE80211_MONITOR); 406 } 407 ieee80211_media_status(ifp, &imr); 408 ifmedia_set(&ic->ic_media, imr.ifm_active); 409 410 if (maxrate) 411 ifp->if_baudrate = IF_Mbps(maxrate); 412 #undef ADD 413 } 414 415 void 416 ieee80211_announce(struct ieee80211com *ic) 417 { 418 struct ifnet *ifp = ic->ic_ifp; 419 int i, mode, rate, mword; 420 struct ieee80211_rateset *rs; 421 422 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 423 if ((ic->ic_modecaps & (1<<mode)) == 0) 424 continue; 425 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 426 rs = &ic->ic_sup_rates[mode]; 427 for (i = 0; i < rs->rs_nrates; i++) { 428 rate = rs->rs_rates[i]; 429 mword = ieee80211_rate2media(ic, rate, mode); 430 if (mword == 0) 431 continue; 432 printf("%s%d%sMbps", (i != 0 ? " " : ""), 433 (rate & IEEE80211_RATE_VAL) / 2, 434 ((rate & 0x1) != 0 ? ".5" : "")); 435 } 436 printf("\n"); 437 } 438 } 439 440 static int 441 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 442 { 443 #define IEEERATE(_ic,_m,_i) \ 444 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 445 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 446 for (i = 0; i < nrates; i++) 447 if (IEEERATE(ic, mode, i) == rate) 448 return i; 449 return -1; 450 #undef IEEERATE 451 } 452 453 /* 454 * Find an instance by it's mac address. 455 */ 456 struct ieee80211com * 457 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 458 { 459 struct ieee80211com *ic; 460 461 /* XXX lock */ 462 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 463 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 464 return ic; 465 return NULL; 466 } 467 468 static struct ieee80211com * 469 ieee80211_find_instance(struct ifnet *ifp) 470 { 471 struct ieee80211com *ic; 472 473 /* XXX lock */ 474 /* XXX not right for multiple instances but works for now */ 475 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 476 if (ic->ic_ifp == ifp) 477 return ic; 478 return NULL; 479 } 480 481 /* 482 * Handle a media change request. 483 */ 484 int 485 ieee80211_media_change(struct ifnet *ifp) 486 { 487 struct ieee80211com *ic; 488 struct ifmedia_entry *ime; 489 enum ieee80211_opmode newopmode; 490 enum ieee80211_phymode newphymode; 491 int i, j, newrate, error = 0; 492 493 ic = ieee80211_find_instance(ifp); 494 if (!ic) { 495 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 496 return EINVAL; 497 } 498 ime = ic->ic_media.ifm_cur; 499 /* 500 * First, identify the phy mode. 501 */ 502 switch (IFM_MODE(ime->ifm_media)) { 503 case IFM_IEEE80211_11A: 504 newphymode = IEEE80211_MODE_11A; 505 break; 506 case IFM_IEEE80211_11B: 507 newphymode = IEEE80211_MODE_11B; 508 break; 509 case IFM_IEEE80211_11G: 510 newphymode = IEEE80211_MODE_11G; 511 break; 512 case IFM_IEEE80211_FH: 513 newphymode = IEEE80211_MODE_FH; 514 break; 515 case IFM_AUTO: 516 newphymode = IEEE80211_MODE_AUTO; 517 break; 518 default: 519 return EINVAL; 520 } 521 /* 522 * Turbo mode is an ``option''. 523 * XXX does not apply to AUTO 524 */ 525 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 526 if (newphymode == IEEE80211_MODE_11A) 527 newphymode = IEEE80211_MODE_TURBO_A; 528 else if (newphymode == IEEE80211_MODE_11G) 529 newphymode = IEEE80211_MODE_TURBO_G; 530 else 531 return EINVAL; 532 } 533 /* 534 * Validate requested mode is available. 535 */ 536 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 537 return EINVAL; 538 539 /* 540 * Next, the fixed/variable rate. 541 */ 542 i = -1; 543 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 544 /* 545 * Convert media subtype to rate. 546 */ 547 newrate = ieee80211_media2rate(ime->ifm_media); 548 if (newrate == 0) 549 return EINVAL; 550 /* 551 * Check the rate table for the specified/current phy. 552 */ 553 if (newphymode == IEEE80211_MODE_AUTO) { 554 /* 555 * In autoselect mode search for the rate. 556 */ 557 for (j = IEEE80211_MODE_11A; 558 j < IEEE80211_MODE_MAX; j++) { 559 if ((ic->ic_modecaps & (1<<j)) == 0) 560 continue; 561 i = findrate(ic, j, newrate); 562 if (i != -1) { 563 /* lock mode too */ 564 newphymode = j; 565 break; 566 } 567 } 568 } else { 569 i = findrate(ic, newphymode, newrate); 570 } 571 if (i == -1) /* mode/rate mismatch */ 572 return EINVAL; 573 } 574 /* NB: defer rate setting to later */ 575 576 /* 577 * Deduce new operating mode but don't install it just yet. 578 */ 579 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 580 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 581 newopmode = IEEE80211_M_AHDEMO; 582 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 583 newopmode = IEEE80211_M_HOSTAP; 584 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 585 newopmode = IEEE80211_M_IBSS; 586 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 587 newopmode = IEEE80211_M_MONITOR; 588 else 589 newopmode = IEEE80211_M_STA; 590 591 /* 592 * Autoselect doesn't make sense when operating as an AP. 593 * If no phy mode has been selected, pick one and lock it 594 * down so rate tables can be used in forming beacon frames 595 * and the like. 596 */ 597 if (newopmode == IEEE80211_M_HOSTAP && 598 newphymode == IEEE80211_MODE_AUTO) { 599 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 600 if (ic->ic_modecaps & (1<<j)) { 601 newphymode = j; 602 break; 603 } 604 } 605 606 /* 607 * Handle phy mode change. 608 */ 609 if (ic->ic_curmode != newphymode) { /* change phy mode */ 610 error = ieee80211_setmode(ic, newphymode); 611 if (error != 0) 612 return error; 613 error = ENETRESET; 614 } 615 616 /* 617 * Committed to changes, install the rate setting. 618 */ 619 if (ic->ic_fixed_rate != i) { 620 ic->ic_fixed_rate = i; /* set fixed tx rate */ 621 error = ENETRESET; 622 } 623 624 /* 625 * Handle operating mode change. 626 */ 627 if (ic->ic_opmode != newopmode) { 628 ic->ic_opmode = newopmode; 629 switch (newopmode) { 630 case IEEE80211_M_AHDEMO: 631 case IEEE80211_M_HOSTAP: 632 case IEEE80211_M_STA: 633 case IEEE80211_M_MONITOR: 634 ic->ic_flags &= ~IEEE80211_F_IBSSON; 635 break; 636 case IEEE80211_M_IBSS: 637 ic->ic_flags |= IEEE80211_F_IBSSON; 638 break; 639 } 640 /* 641 * Yech, slot time may change depending on the 642 * operating mode so reset it to be sure everything 643 * is setup appropriately. 644 */ 645 ieee80211_reset_erp(ic); 646 ieee80211_wme_initparams(ic); /* after opmode change */ 647 error = ENETRESET; 648 } 649 #ifdef notdef 650 if (error == 0) 651 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 652 #endif 653 return error; 654 } 655 656 void 657 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 658 { 659 struct ieee80211com *ic; 660 struct ieee80211_rateset *rs; 661 662 ic = ieee80211_find_instance(ifp); 663 if (!ic) { 664 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 665 return; 666 } 667 imr->ifm_status = IFM_AVALID; 668 imr->ifm_active = IFM_IEEE80211; 669 if (ic->ic_state == IEEE80211_S_RUN) 670 imr->ifm_status |= IFM_ACTIVE; 671 /* 672 * Calculate a current rate if possible. 673 */ 674 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 675 /* 676 * A fixed rate is set, report that. 677 */ 678 rs = &ic->ic_sup_rates[ic->ic_curmode]; 679 imr->ifm_active |= ieee80211_rate2media(ic, 680 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 681 } else if (ic->ic_opmode == IEEE80211_M_STA) { 682 /* 683 * In station mode report the current transmit rate. 684 */ 685 rs = &ic->ic_bss->ni_rates; 686 imr->ifm_active |= ieee80211_rate2media(ic, 687 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 688 } else 689 imr->ifm_active |= IFM_AUTO; 690 switch (ic->ic_opmode) { 691 case IEEE80211_M_STA: 692 break; 693 case IEEE80211_M_IBSS: 694 imr->ifm_active |= IFM_IEEE80211_ADHOC; 695 break; 696 case IEEE80211_M_AHDEMO: 697 /* should not come here */ 698 break; 699 case IEEE80211_M_HOSTAP: 700 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 701 break; 702 case IEEE80211_M_MONITOR: 703 imr->ifm_active |= IFM_IEEE80211_MONITOR; 704 break; 705 } 706 switch (ic->ic_curmode) { 707 case IEEE80211_MODE_11A: 708 imr->ifm_active |= IFM_IEEE80211_11A; 709 break; 710 case IEEE80211_MODE_11B: 711 imr->ifm_active |= IFM_IEEE80211_11B; 712 break; 713 case IEEE80211_MODE_11G: 714 imr->ifm_active |= IFM_IEEE80211_11G; 715 break; 716 case IEEE80211_MODE_FH: 717 imr->ifm_active |= IFM_IEEE80211_FH; 718 break; 719 case IEEE80211_MODE_TURBO_A: 720 imr->ifm_active |= IFM_IEEE80211_11A 721 | IFM_IEEE80211_TURBO; 722 break; 723 case IEEE80211_MODE_TURBO_G: 724 imr->ifm_active |= IFM_IEEE80211_11G 725 | IFM_IEEE80211_TURBO; 726 break; 727 } 728 } 729 730 void 731 ieee80211_watchdog(struct ieee80211com *ic) 732 { 733 struct ieee80211_node_table *nt; 734 int need_inact_timer = 0; 735 736 if (ic->ic_state != IEEE80211_S_INIT) { 737 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 738 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 739 nt = &ic->ic_scan; 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 nt = &ic->ic_sta; 746 if (nt->nt_inact_timer) { 747 if (--nt->nt_inact_timer == 0) 748 nt->nt_timeout(nt); 749 need_inact_timer += nt->nt_inact_timer; 750 } 751 } 752 if (ic->ic_mgt_timer != 0 || need_inact_timer) 753 ic->ic_ifp->if_timer = 1; 754 } 755 756 /* 757 * Set the current phy mode and recalculate the active channel 758 * set based on the available channels for this mode. Also 759 * select a new default/current channel if the current one is 760 * inappropriate for this mode. 761 */ 762 int 763 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 764 { 765 #define N(a) (sizeof(a) / sizeof(a[0])) 766 static const u_int chanflags[] = { 767 0, /* IEEE80211_MODE_AUTO */ 768 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 769 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 770 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 771 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 772 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 773 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 774 }; 775 struct ieee80211_channel *c; 776 u_int modeflags; 777 int i; 778 779 /* validate new mode */ 780 if ((ic->ic_modecaps & (1<<mode)) == 0) { 781 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 782 "%s: mode %u not supported (caps 0x%x)\n", 783 __func__, mode, ic->ic_modecaps); 784 return EINVAL; 785 } 786 787 /* 788 * Verify at least one channel is present in the available 789 * channel list before committing to the new mode. 790 */ 791 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 792 modeflags = chanflags[mode]; 793 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 794 c = &ic->ic_channels[i]; 795 if (c->ic_flags == 0) 796 continue; 797 if (mode == IEEE80211_MODE_AUTO) { 798 /* ignore static turbo channels for autoselect */ 799 if (!IEEE80211_IS_CHAN_T(c)) 800 break; 801 } else { 802 if ((c->ic_flags & modeflags) == modeflags) 803 break; 804 } 805 } 806 if (i > IEEE80211_CHAN_MAX) { 807 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 808 "%s: no channels found for mode %u\n", __func__, mode); 809 return EINVAL; 810 } 811 812 /* 813 * Calculate the active channel set. 814 */ 815 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 816 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 817 c = &ic->ic_channels[i]; 818 if (c->ic_flags == 0) 819 continue; 820 if (mode == IEEE80211_MODE_AUTO) { 821 /* take anything but static turbo channels */ 822 if (!IEEE80211_IS_CHAN_T(c)) 823 setbit(ic->ic_chan_active, i); 824 } else { 825 if ((c->ic_flags & modeflags) == modeflags) 826 setbit(ic->ic_chan_active, i); 827 } 828 } 829 /* 830 * If no current/default channel is setup or the current 831 * channel is wrong for the mode then pick the first 832 * available channel from the active list. This is likely 833 * not the right one. 834 */ 835 if (ic->ic_ibss_chan == NULL || 836 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 837 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 838 if (isset(ic->ic_chan_active, i)) { 839 ic->ic_ibss_chan = &ic->ic_channels[i]; 840 break; 841 } 842 KASSERT(ic->ic_ibss_chan != NULL && 843 isset(ic->ic_chan_active, 844 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 845 ("Bad IBSS channel %u", 846 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 847 } 848 /* 849 * If the desired channel is set but no longer valid then reset it. 850 */ 851 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 852 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 853 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 854 855 /* 856 * Do mode-specific rate setup. 857 */ 858 if (mode == IEEE80211_MODE_11G) { 859 /* 860 * Use a mixed 11b/11g rate set. 861 */ 862 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 863 IEEE80211_MODE_11G); 864 } else if (mode == IEEE80211_MODE_11B) { 865 /* 866 * Force pure 11b rate set. 867 */ 868 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 869 IEEE80211_MODE_11B); 870 } 871 /* 872 * Setup an initial rate set according to the 873 * current/default channel selected above. This 874 * will be changed when scanning but must exist 875 * now so driver have a consistent state of ic_ibss_chan. 876 */ 877 if (ic->ic_bss) /* NB: can be called before lateattach */ 878 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 879 880 ic->ic_curmode = mode; 881 ieee80211_reset_erp(ic); /* reset ERP state */ 882 ieee80211_wme_initparams(ic); /* reset WME stat */ 883 884 return 0; 885 #undef N 886 } 887 888 /* 889 * Return the phy mode for with the specified channel so the 890 * caller can select a rate set. This is problematic for channels 891 * where multiple operating modes are possible (e.g. 11g+11b). 892 * In those cases we defer to the current operating mode when set. 893 */ 894 enum ieee80211_phymode 895 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 896 { 897 if (IEEE80211_IS_CHAN_T(chan)) { 898 return IEEE80211_MODE_TURBO_A; 899 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 900 return IEEE80211_MODE_11A; 901 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 902 return IEEE80211_MODE_FH; 903 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 904 /* 905 * This assumes all 11g channels are also usable 906 * for 11b, which is currently true. 907 */ 908 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 909 return IEEE80211_MODE_TURBO_G; 910 if (ic->ic_curmode == IEEE80211_MODE_11B) 911 return IEEE80211_MODE_11B; 912 return IEEE80211_MODE_11G; 913 } else 914 return IEEE80211_MODE_11B; 915 } 916 917 /* 918 * convert IEEE80211 rate value to ifmedia subtype. 919 * ieee80211 rate is in unit of 0.5Mbps. 920 */ 921 int 922 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 923 { 924 #define N(a) (sizeof(a) / sizeof(a[0])) 925 static const struct { 926 u_int m; /* rate + mode */ 927 u_int r; /* if_media rate */ 928 } rates[] = { 929 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 930 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 931 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 932 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 933 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 934 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 935 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 936 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 937 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 938 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 939 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 940 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 941 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 942 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 943 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 944 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 945 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 946 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 947 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 948 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 949 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 950 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 951 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 952 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 953 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 954 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 955 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 956 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 957 }; 958 u_int mask, i; 959 960 mask = rate & IEEE80211_RATE_VAL; 961 switch (mode) { 962 case IEEE80211_MODE_11A: 963 case IEEE80211_MODE_TURBO_A: 964 mask |= IFM_IEEE80211_11A; 965 break; 966 case IEEE80211_MODE_11B: 967 mask |= IFM_IEEE80211_11B; 968 break; 969 case IEEE80211_MODE_FH: 970 mask |= IFM_IEEE80211_FH; 971 break; 972 case IEEE80211_MODE_AUTO: 973 /* NB: ic may be NULL for some drivers */ 974 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 975 mask |= IFM_IEEE80211_FH; 976 break; 977 } 978 /* NB: hack, 11g matches both 11b+11a rates */ 979 /* fall thru... */ 980 case IEEE80211_MODE_11G: 981 case IEEE80211_MODE_TURBO_G: 982 mask |= IFM_IEEE80211_11G; 983 break; 984 } 985 for (i = 0; i < N(rates); i++) 986 if (rates[i].m == mask) 987 return rates[i].r; 988 return IFM_AUTO; 989 #undef N 990 } 991 992 int 993 ieee80211_media2rate(int mword) 994 { 995 #define N(a) (sizeof(a) / sizeof(a[0])) 996 static const int ieeerates[] = { 997 -1, /* IFM_AUTO */ 998 0, /* IFM_MANUAL */ 999 0, /* IFM_NONE */ 1000 2, /* IFM_IEEE80211_FH1 */ 1001 4, /* IFM_IEEE80211_FH2 */ 1002 2, /* IFM_IEEE80211_DS1 */ 1003 4, /* IFM_IEEE80211_DS2 */ 1004 11, /* IFM_IEEE80211_DS5 */ 1005 22, /* IFM_IEEE80211_DS11 */ 1006 44, /* IFM_IEEE80211_DS22 */ 1007 12, /* IFM_IEEE80211_OFDM6 */ 1008 18, /* IFM_IEEE80211_OFDM9 */ 1009 24, /* IFM_IEEE80211_OFDM12 */ 1010 36, /* IFM_IEEE80211_OFDM18 */ 1011 48, /* IFM_IEEE80211_OFDM24 */ 1012 72, /* IFM_IEEE80211_OFDM36 */ 1013 96, /* IFM_IEEE80211_OFDM48 */ 1014 108, /* IFM_IEEE80211_OFDM54 */ 1015 144, /* IFM_IEEE80211_OFDM72 */ 1016 }; 1017 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1018 ieeerates[IFM_SUBTYPE(mword)] : 0; 1019 #undef N 1020 }
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