ieee80211.c revision 165825
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: head/sys/net80211/ieee80211.c 165825 2007-01-06 05:38:18Z mjacob $"); 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 54const 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/* 65 * Default supported rates for 802.11 operation (in IEEE .5Mb units). 66 */ 67#define B(r) ((r) | IEEE80211_RATE_BASIC) 68static const struct ieee80211_rateset ieee80211_rateset_11a = 69 { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } }; 70static const struct ieee80211_rateset ieee80211_rateset_half = 71 { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } }; 72static const struct ieee80211_rateset ieee80211_rateset_quarter = 73 { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } }; 74static const struct ieee80211_rateset ieee80211_rateset_11b = 75 { 4, { B(2), B(4), B(11), B(22) } }; 76/* NB: OFDM rates are handled specially based on mode */ 77static const struct ieee80211_rateset ieee80211_rateset_11g = 78 { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } }; 79#undef B 80 81/* list of all instances */ 82SLIST_HEAD(ieee80211_list, ieee80211com); 83static struct ieee80211_list ieee80211_list = 84 SLIST_HEAD_INITIALIZER(ieee80211_list); 85static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 86static struct mtx ieee80211_vap_mtx; 87MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF); 88 89static void 90ieee80211_add_vap(struct ieee80211com *ic) 91{ 92#define N(a) (sizeof(a)/sizeof(a[0])) 93 int i; 94 u_int8_t b; 95 96 mtx_lock(&ieee80211_vap_mtx); 97 ic->ic_vap = 0; 98 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 99 ic->ic_vap += NBBY; 100 if (i == N(ieee80211_vapmap)) 101 panic("vap table full"); 102 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 103 ic->ic_vap++; 104 setbit(ieee80211_vapmap, ic->ic_vap); 105 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 106 mtx_unlock(&ieee80211_vap_mtx); 107#undef N 108} 109 110static void 111ieee80211_remove_vap(struct ieee80211com *ic) 112{ 113 mtx_lock(&ieee80211_vap_mtx); 114 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 115 KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 116 ("invalid vap id %d", ic->ic_vap)); 117 KASSERT(isset(ieee80211_vapmap, ic->ic_vap), 118 ("vap id %d not allocated", ic->ic_vap)); 119 clrbit(ieee80211_vapmap, ic->ic_vap); 120 mtx_unlock(&ieee80211_vap_mtx); 121} 122 123/* 124 * Default reset method for use with the ioctl support. This 125 * method is invoked after any state change in the 802.11 126 * layer that should be propagated to the hardware but not 127 * require re-initialization of the 802.11 state machine (e.g 128 * rescanning for an ap). We always return ENETRESET which 129 * should cause the driver to re-initialize the device. Drivers 130 * can override this method to implement more optimized support. 131 */ 132static int 133ieee80211_default_reset(struct ifnet *ifp) 134{ 135 return ENETRESET; 136} 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 */ 143static void 144ieee80211_chan_init(struct ieee80211com *ic) 145{ 146#define DEFAULTRATES(m, def) do { \ 147 if ((ic->ic_modecaps & (1<<m)) && ic->ic_sup_rates[m].rs_nrates == 0) \ 148 ic->ic_sup_rates[m] = def; \ 149} while (0) 150 struct ifnet *ifp = ic->ic_ifp; 151 struct ieee80211_channel *c; 152 int i; 153 154 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 155 ic->ic_modecaps = 1<<IEEE80211_MODE_AUTO; 156 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 157 c = &ic->ic_channels[i]; 158 if (c->ic_flags) { 159 /* 160 * Verify driver passed us valid data. 161 */ 162 if (i != ieee80211_chan2ieee(ic, c)) { 163 if_printf(ifp, "bad channel ignored; " 164 "freq %u flags %x number %u\n", 165 c->ic_freq, c->ic_flags, i); 166 c->ic_flags = 0; /* NB: remove */ 167 continue; 168 } 169 setbit(ic->ic_chan_avail, i); 170 /* 171 * Identify mode capabilities. 172 */ 173 if (IEEE80211_IS_CHAN_A(c)) 174 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 175 if (IEEE80211_IS_CHAN_B(c)) 176 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 177 if (IEEE80211_IS_CHAN_ANYG(c)) 178 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 179 if (IEEE80211_IS_CHAN_FHSS(c)) 180 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 181 if (IEEE80211_IS_CHAN_T(c)) 182 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 183 if (IEEE80211_IS_CHAN_108G(c)) 184 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 185 if (ic->ic_curchan == NULL) { 186 /* arbitrarily pick the first channel */ 187 ic->ic_curchan = &ic->ic_channels[i]; 188 } 189 } 190 } 191 192 /* fillin well-known rate sets if driver has not specified */ 193 DEFAULTRATES(IEEE80211_MODE_11B, ieee80211_rateset_11b); 194 DEFAULTRATES(IEEE80211_MODE_11G, ieee80211_rateset_11g); 195 DEFAULTRATES(IEEE80211_MODE_11A, ieee80211_rateset_11a); 196 DEFAULTRATES(IEEE80211_MODE_TURBO_A, ieee80211_rateset_11a); 197 DEFAULTRATES(IEEE80211_MODE_TURBO_G, ieee80211_rateset_11g); 198 199 /* 200 * Set auto mode to reset active channel state and any desired channel. 201 */ 202 (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO); 203#undef DEFAULTRATES 204} 205 206void 207ieee80211_ifattach(struct ieee80211com *ic) 208{ 209 struct ifnet *ifp = ic->ic_ifp; 210 211 ether_ifattach(ifp, ic->ic_myaddr); 212 ifp->if_output = ieee80211_output; 213 214 bpfattach2(ifp, DLT_IEEE802_11, 215 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 216 217 ieee80211_crypto_attach(ic); 218 219 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 220 /* 221 * Fill in 802.11 available channel set, mark all 222 * available channels as active, and pick a default 223 * channel if not already specified. 224 */ 225 ieee80211_chan_init(ic); 226#if 0 227 /* 228 * Enable WME by default if we're capable. 229 */ 230 if (ic->ic_caps & IEEE80211_C_WME) 231 ic->ic_flags |= IEEE80211_F_WME; 232#endif 233 if (ic->ic_caps & IEEE80211_C_BURST) 234 ic->ic_flags |= IEEE80211_F_BURST; 235 236 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 237 ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT; 238 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 239 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 240 241 ic->ic_lintval = ic->ic_bintval; 242 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 243 244 ieee80211_node_attach(ic); 245 ieee80211_proto_attach(ic); 246 247 ieee80211_add_vap(ic); 248 249 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 250 251 /* 252 * Install a default reset method for the ioctl support. 253 * The driver is expected to fill this in before calling us. 254 */ 255 if (ic->ic_reset == NULL) 256 ic->ic_reset = ieee80211_default_reset; 257 258 KASSERT(ifp->if_spare2 == NULL, ("oops, hosed")); 259 ifp->if_spare2 = ic; /* XXX temp backpointer */ 260} 261 262void 263ieee80211_ifdetach(struct ieee80211com *ic) 264{ 265 struct ifnet *ifp = ic->ic_ifp; 266 267 ieee80211_remove_vap(ic); 268 269 ieee80211_sysctl_detach(ic); 270 ieee80211_proto_detach(ic); 271 ieee80211_crypto_detach(ic); 272 ieee80211_node_detach(ic); 273 ifmedia_removeall(&ic->ic_media); 274 275 IEEE80211_BEACON_LOCK_DESTROY(ic); 276 277 bpfdetach(ifp); 278 ether_ifdetach(ifp); 279} 280 281/* 282 * Convert MHz frequency to IEEE channel number. 283 */ 284int 285ieee80211_mhz2ieee(u_int freq, u_int flags) 286{ 287 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 288 if (freq == 2484) 289 return 14; 290 if (freq < 2484) 291 return ((int) freq - 2407) / 5; 292 else 293 return 15 + ((freq - 2512) / 20); 294 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 295 if (freq <= 5000) { 296 if (flags &(IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) 297 return 37 + ((freq * 10) + 298 ((freq % 5) == 2 ? 5 : 0) - 49400) / 5; 299 return (freq - 4000) / 5; 300 } else 301 return (freq - 5000) / 5; 302 } else { /* either, guess */ 303 if (freq == 2484) 304 return 14; 305 if (freq < 2484) 306 return ((int) freq - 2407) / 5; 307 if (freq < 5000) { 308 if (flags &(IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) 309 return 37 + ((freq * 10) + 310 ((freq % 5) == 2 ? 5 : 0) - 49400) / 5; 311 else if (freq > 4900) 312 return (freq - 4000) / 5; 313 else 314 return 15 + ((freq - 2512) / 20); 315 } 316 return (freq - 5000) / 5; 317 } 318} 319 320/* 321 * Convert channel to IEEE channel number. 322 */ 323int 324ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c) 325{ 326 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 327 return c - ic->ic_channels; 328 else if (c == IEEE80211_CHAN_ANYC) 329 return IEEE80211_CHAN_ANY; 330 else if (c != NULL) { 331 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 332 c->ic_freq, c->ic_flags); 333 return 0; /* XXX */ 334 } else { 335 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 336 return 0; /* XXX */ 337 } 338} 339 340/* 341 * Convert IEEE channel number to MHz frequency. 342 */ 343u_int 344ieee80211_ieee2mhz(u_int chan, u_int flags) 345{ 346 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 347 if (chan == 14) 348 return 2484; 349 if (chan < 14) 350 return 2407 + chan*5; 351 else 352 return 2512 + ((chan-15)*20); 353 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 354 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) { 355 chan -= 37; 356 return 4940 + chan*5 + (chan % 5 ? 2 : 0); 357 } 358 return 5000 + (chan*5); 359 } else { /* either, guess */ 360 if (chan == 14) 361 return 2484; 362 if (chan < 14) /* 0-13 */ 363 return 2407 + chan*5; 364 if (chan < 27) /* 15-26 */ 365 return 2512 + ((chan-15)*20); 366 /* XXX can't distinguish PSB channels */ 367 return 5000 + (chan*5); 368 } 369} 370 371/* 372 * Setup the media data structures according to the channel and 373 * rate tables. This must be called by the driver after 374 * ieee80211_attach and before most anything else. 375 */ 376void 377ieee80211_media_init(struct ieee80211com *ic, 378 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 379{ 380#define ADD(_ic, _s, _o) \ 381 ifmedia_add(&(_ic)->ic_media, \ 382 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 383 struct ifnet *ifp = ic->ic_ifp; 384 struct ifmediareq imr; 385 int i, j, mode, rate, maxrate, mword, mopt, r; 386 struct ieee80211_rateset *rs; 387 struct ieee80211_rateset allrates; 388 389 /* NB: this works because the structure is initialized to zero */ 390 if (LIST_EMPTY(&ic->ic_media.ifm_list)) { 391 /* 392 * Do late attach work that must wait for any subclass 393 * (i.e. driver) work such as overriding methods. 394 */ 395 ieee80211_node_lateattach(ic); 396 } else { 397 /* 398 * We are re-initializing the channel list; clear 399 * the existing media state as the media routines 400 * don't suppress duplicates. 401 */ 402 ifmedia_removeall(&ic->ic_media); 403 ieee80211_chan_init(ic); 404 } 405 406 /* 407 * Fill in media characteristics. 408 */ 409 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 410 maxrate = 0; 411 memset(&allrates, 0, sizeof(allrates)); 412 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 413 static const u_int mopts[] = { 414 IFM_AUTO, 415 IFM_IEEE80211_11A, 416 IFM_IEEE80211_11B, 417 IFM_IEEE80211_11G, 418 IFM_IEEE80211_FH, 419 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 420 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 421 }; 422 if ((ic->ic_modecaps & (1<<mode)) == 0) 423 continue; 424 mopt = mopts[mode]; 425 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 426 if (ic->ic_caps & IEEE80211_C_IBSS) 427 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 428 if (ic->ic_caps & IEEE80211_C_HOSTAP) 429 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 430 if (ic->ic_caps & IEEE80211_C_AHDEMO) 431 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 432 if (ic->ic_caps & IEEE80211_C_MONITOR) 433 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 434 if (mode == IEEE80211_MODE_AUTO) 435 continue; 436 rs = &ic->ic_sup_rates[mode]; 437 for (i = 0; i < rs->rs_nrates; i++) { 438 rate = rs->rs_rates[i]; 439 mword = ieee80211_rate2media(ic, rate, mode); 440 if (mword == 0) 441 continue; 442 ADD(ic, mword, mopt); 443 if (ic->ic_caps & IEEE80211_C_IBSS) 444 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 445 if (ic->ic_caps & IEEE80211_C_HOSTAP) 446 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 447 if (ic->ic_caps & IEEE80211_C_AHDEMO) 448 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 449 if (ic->ic_caps & IEEE80211_C_MONITOR) 450 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 451 /* 452 * Add rate to the collection of all rates. 453 */ 454 r = rate & IEEE80211_RATE_VAL; 455 for (j = 0; j < allrates.rs_nrates; j++) 456 if (allrates.rs_rates[j] == r) 457 break; 458 if (j == allrates.rs_nrates) { 459 /* unique, add to the set */ 460 allrates.rs_rates[j] = r; 461 allrates.rs_nrates++; 462 } 463 rate = (rate & IEEE80211_RATE_VAL) / 2; 464 if (rate > maxrate) 465 maxrate = rate; 466 } 467 } 468 for (i = 0; i < allrates.rs_nrates; i++) { 469 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 470 IEEE80211_MODE_AUTO); 471 if (mword == 0) 472 continue; 473 mword = IFM_SUBTYPE(mword); /* remove media options */ 474 ADD(ic, mword, 0); 475 if (ic->ic_caps & IEEE80211_C_IBSS) 476 ADD(ic, mword, IFM_IEEE80211_ADHOC); 477 if (ic->ic_caps & IEEE80211_C_HOSTAP) 478 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 479 if (ic->ic_caps & IEEE80211_C_AHDEMO) 480 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 481 if (ic->ic_caps & IEEE80211_C_MONITOR) 482 ADD(ic, mword, IFM_IEEE80211_MONITOR); 483 } 484 ieee80211_media_status(ifp, &imr); 485 ifmedia_set(&ic->ic_media, imr.ifm_active); 486 487 if (maxrate) 488 ifp->if_baudrate = IF_Mbps(maxrate); 489#undef ADD 490} 491 492const struct ieee80211_rateset * 493ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c) 494{ 495 enum ieee80211_phymode mode = ieee80211_chan2mode(ic, c); 496 497 if (mode == IEEE80211_MODE_11A) { 498 if (IEEE80211_IS_CHAN_HALF(c)) 499 return &ieee80211_rateset_half; 500 if (IEEE80211_IS_CHAN_QUARTER(c)) 501 return &ieee80211_rateset_quarter; 502 } 503 return &ic->ic_sup_rates[mode]; 504} 505 506void 507ieee80211_announce(struct ieee80211com *ic) 508{ 509 struct ifnet *ifp = ic->ic_ifp; 510 int i, mode, rate, mword; 511 struct ieee80211_rateset *rs; 512 513 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 514 if ((ic->ic_modecaps & (1<<mode)) == 0) 515 continue; 516 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 517 rs = &ic->ic_sup_rates[mode]; 518 for (i = 0; i < rs->rs_nrates; i++) { 519 rate = rs->rs_rates[i]; 520 mword = ieee80211_rate2media(ic, rate, mode); 521 if (mword == 0) 522 continue; 523 printf("%s%d%sMbps", (i != 0 ? " " : ""), 524 (rate & IEEE80211_RATE_VAL) / 2, 525 ((rate & 0x1) != 0 ? ".5" : "")); 526 } 527 printf("\n"); 528 } 529} 530 531static int 532findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 533{ 534#define IEEERATE(_ic,_m,_i) \ 535 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 536 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 537 for (i = 0; i < nrates; i++) 538 if (IEEERATE(ic, mode, i) == rate) 539 return i; 540 return -1; 541#undef IEEERATE 542} 543 544/* 545 * Find an instance by it's mac address. 546 */ 547struct ieee80211com * 548ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 549{ 550 struct ieee80211com *ic; 551 552 /* XXX lock */ 553 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 554 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 555 return ic; 556 return NULL; 557} 558 559static struct ieee80211com * 560ieee80211_find_instance(struct ifnet *ifp) 561{ 562 struct ieee80211com *ic; 563 564 /* XXX lock */ 565 /* XXX not right for multiple instances but works for now */ 566 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 567 if (ic->ic_ifp == ifp) 568 return ic; 569 return NULL; 570} 571 572/* 573 * Handle a media change request. 574 */ 575int 576ieee80211_media_change(struct ifnet *ifp) 577{ 578 struct ieee80211com *ic; 579 struct ifmedia_entry *ime; 580 enum ieee80211_opmode newopmode; 581 enum ieee80211_phymode newphymode; 582 int i, j, newrate, error = 0; 583 584 ic = ieee80211_find_instance(ifp); 585 if (!ic) { 586 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 587 return EINVAL; 588 } 589 ime = ic->ic_media.ifm_cur; 590 /* 591 * First, identify the phy mode. 592 */ 593 switch (IFM_MODE(ime->ifm_media)) { 594 case IFM_IEEE80211_11A: 595 newphymode = IEEE80211_MODE_11A; 596 break; 597 case IFM_IEEE80211_11B: 598 newphymode = IEEE80211_MODE_11B; 599 break; 600 case IFM_IEEE80211_11G: 601 newphymode = IEEE80211_MODE_11G; 602 break; 603 case IFM_IEEE80211_FH: 604 newphymode = IEEE80211_MODE_FH; 605 break; 606 case IFM_AUTO: 607 newphymode = IEEE80211_MODE_AUTO; 608 break; 609 default: 610 return EINVAL; 611 } 612 /* 613 * Turbo mode is an ``option''. 614 * XXX does not apply to AUTO 615 */ 616 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 617 if (newphymode == IEEE80211_MODE_11A) 618 newphymode = IEEE80211_MODE_TURBO_A; 619 else if (newphymode == IEEE80211_MODE_11G) 620 newphymode = IEEE80211_MODE_TURBO_G; 621 else 622 return EINVAL; 623 } 624 /* 625 * Validate requested mode is available. 626 */ 627 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 628 return EINVAL; 629 630 /* 631 * Next, the fixed/variable rate. 632 */ 633 i = -1; 634 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 635 /* 636 * Convert media subtype to rate. 637 */ 638 newrate = ieee80211_media2rate(ime->ifm_media); 639 if (newrate == 0) 640 return EINVAL; 641 /* 642 * Check the rate table for the specified/current phy. 643 */ 644 if (newphymode == IEEE80211_MODE_AUTO) { 645 /* 646 * In autoselect mode search for the rate. 647 */ 648 for (j = IEEE80211_MODE_11A; 649 j < IEEE80211_MODE_MAX; j++) { 650 if ((ic->ic_modecaps & (1<<j)) == 0) 651 continue; 652 i = findrate(ic, j, newrate); 653 if (i != -1) { 654 /* lock mode too */ 655 newphymode = j; 656 break; 657 } 658 } 659 } else { 660 i = findrate(ic, newphymode, newrate); 661 } 662 if (i == -1) /* mode/rate mismatch */ 663 return EINVAL; 664 } 665 /* NB: defer rate setting to later */ 666 667 /* 668 * Deduce new operating mode but don't install it just yet. 669 */ 670 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 671 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 672 newopmode = IEEE80211_M_AHDEMO; 673 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 674 newopmode = IEEE80211_M_HOSTAP; 675 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 676 newopmode = IEEE80211_M_IBSS; 677 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 678 newopmode = IEEE80211_M_MONITOR; 679 else 680 newopmode = IEEE80211_M_STA; 681 682 /* 683 * Autoselect doesn't make sense when operating as an AP. 684 * If no phy mode has been selected, pick one and lock it 685 * down so rate tables can be used in forming beacon frames 686 * and the like. 687 */ 688 if (newopmode == IEEE80211_M_HOSTAP && 689 newphymode == IEEE80211_MODE_AUTO) { 690 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 691 if (ic->ic_modecaps & (1<<j)) { 692 newphymode = j; 693 break; 694 } 695 } 696 697 /* 698 * Handle phy mode change. 699 */ 700 if (ic->ic_curmode != newphymode) { /* change phy mode */ 701 error = ieee80211_setmode(ic, newphymode); 702 if (error != 0) 703 return error; 704 error = ENETRESET; 705 } 706 707 /* 708 * Committed to changes, install the rate setting. 709 */ 710 if (ic->ic_fixed_rate != i) { 711 ic->ic_fixed_rate = i; /* set fixed tx rate */ 712 error = ENETRESET; 713 } 714 715 /* 716 * Handle operating mode change. 717 */ 718 if (ic->ic_opmode != newopmode) { 719 ic->ic_opmode = newopmode; 720 switch (newopmode) { 721 case IEEE80211_M_AHDEMO: 722 case IEEE80211_M_HOSTAP: 723 case IEEE80211_M_STA: 724 case IEEE80211_M_MONITOR: 725 ic->ic_flags &= ~IEEE80211_F_IBSSON; 726 break; 727 case IEEE80211_M_IBSS: 728 ic->ic_flags |= IEEE80211_F_IBSSON; 729 break; 730 } 731 /* 732 * Yech, slot time may change depending on the 733 * operating mode so reset it to be sure everything 734 * is setup appropriately. 735 */ 736 ieee80211_reset_erp(ic); 737 ieee80211_wme_initparams(ic); /* after opmode change */ 738 error = ENETRESET; 739 } 740#ifdef notdef 741 if (error == 0) 742 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 743#endif 744 return error; 745} 746 747void 748ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 749{ 750 struct ieee80211com *ic; 751 const struct ieee80211_rateset *rs; 752 753 ic = ieee80211_find_instance(ifp); 754 if (!ic) { 755 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 756 return; 757 } 758 imr->ifm_status = IFM_AVALID; 759 imr->ifm_active = IFM_IEEE80211; 760 if (ic->ic_state == IEEE80211_S_RUN) 761 imr->ifm_status |= IFM_ACTIVE; 762 /* 763 * Calculate a current rate if possible. 764 */ 765 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 766 /* 767 * A fixed rate is set, report that. 768 */ 769 rs = &ic->ic_sup_rates[ic->ic_curmode]; 770 imr->ifm_active |= ieee80211_rate2media(ic, 771 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 772 } else if (ic->ic_opmode == IEEE80211_M_STA) { 773 /* 774 * In station mode report the current transmit rate. 775 */ 776 rs = &ic->ic_bss->ni_rates; 777 imr->ifm_active |= ieee80211_rate2media(ic, 778 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 779 } else 780 imr->ifm_active |= IFM_AUTO; 781 switch (ic->ic_opmode) { 782 case IEEE80211_M_STA: 783 break; 784 case IEEE80211_M_IBSS: 785 imr->ifm_active |= IFM_IEEE80211_ADHOC; 786 break; 787 case IEEE80211_M_AHDEMO: 788 /* should not come here */ 789 break; 790 case IEEE80211_M_HOSTAP: 791 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 792 break; 793 case IEEE80211_M_MONITOR: 794 imr->ifm_active |= IFM_IEEE80211_MONITOR; 795 break; 796 } 797 switch (ic->ic_curmode) { 798 case IEEE80211_MODE_11A: 799 imr->ifm_active |= IFM_IEEE80211_11A; 800 break; 801 case IEEE80211_MODE_11B: 802 imr->ifm_active |= IFM_IEEE80211_11B; 803 break; 804 case IEEE80211_MODE_11G: 805 imr->ifm_active |= IFM_IEEE80211_11G; 806 break; 807 case IEEE80211_MODE_FH: 808 imr->ifm_active |= IFM_IEEE80211_FH; 809 break; 810 case IEEE80211_MODE_TURBO_A: 811 imr->ifm_active |= IFM_IEEE80211_11A 812 | IFM_IEEE80211_TURBO; 813 break; 814 case IEEE80211_MODE_TURBO_G: 815 imr->ifm_active |= IFM_IEEE80211_11G 816 | IFM_IEEE80211_TURBO; 817 break; 818 } 819} 820 821void 822ieee80211_watchdog(struct ieee80211com *ic) 823{ 824 struct ieee80211_node_table *nt; 825 int need_inact_timer = 0; 826 827 if (ic->ic_state != IEEE80211_S_INIT) { 828 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 829 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 830 nt = &ic->ic_scan; 831 if (nt->nt_inact_timer) { 832 if (--nt->nt_inact_timer == 0) 833 nt->nt_timeout(nt); 834 need_inact_timer += nt->nt_inact_timer; 835 } 836 nt = &ic->ic_sta; 837 if (nt->nt_inact_timer) { 838 if (--nt->nt_inact_timer == 0) 839 nt->nt_timeout(nt); 840 need_inact_timer += nt->nt_inact_timer; 841 } 842 } 843 if (ic->ic_mgt_timer != 0 || need_inact_timer) 844 ic->ic_ifp->if_timer = 1; 845} 846 847/* 848 * Set the current phy mode and recalculate the active channel 849 * set based on the available channels for this mode. Also 850 * select a new default/current channel if the current one is 851 * inappropriate for this mode. 852 */ 853int 854ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 855{ 856#define N(a) (sizeof(a) / sizeof(a[0])) 857 static const u_int chanflags[] = { 858 0, /* IEEE80211_MODE_AUTO */ 859 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 860 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 861 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 862 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 863 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 864 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 865 }; 866 struct ieee80211_channel *c; 867 u_int modeflags; 868 int i; 869 870 /* validate new mode */ 871 if ((ic->ic_modecaps & (1<<mode)) == 0) { 872 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 873 "%s: mode %u not supported (caps 0x%x)\n", 874 __func__, mode, ic->ic_modecaps); 875 return EINVAL; 876 } 877 878 /* 879 * Verify at least one channel is present in the available 880 * channel list before committing to the new mode. 881 */ 882 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 883 modeflags = chanflags[mode]; 884 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 885 c = &ic->ic_channels[i]; 886 if (c->ic_flags == 0) 887 continue; 888 if (mode == IEEE80211_MODE_AUTO) { 889 /* ignore static turbo channels for autoselect */ 890 if (!IEEE80211_IS_CHAN_T(c)) 891 break; 892 } else { 893 if ((c->ic_flags & modeflags) == modeflags) 894 break; 895 } 896 } 897 if (i > IEEE80211_CHAN_MAX) { 898 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 899 "%s: no channels found for mode %u\n", __func__, mode); 900 return EINVAL; 901 } 902 903 /* 904 * Calculate the active channel set. 905 */ 906 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 907 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 908 c = &ic->ic_channels[i]; 909 if (c->ic_flags == 0) 910 continue; 911 if (mode == IEEE80211_MODE_AUTO) { 912 /* take anything but static turbo channels */ 913 if (!IEEE80211_IS_CHAN_T(c)) 914 setbit(ic->ic_chan_active, i); 915 } else { 916 if ((c->ic_flags & modeflags) == modeflags) 917 setbit(ic->ic_chan_active, i); 918 } 919 } 920 /* 921 * If no current/default channel is setup or the current 922 * channel is wrong for the mode then pick the first 923 * available channel from the active list. This is likely 924 * not the right one. 925 */ 926 if (ic->ic_ibss_chan == NULL || 927 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 928 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 929 if (isset(ic->ic_chan_active, i)) { 930 ic->ic_ibss_chan = &ic->ic_channels[i]; 931 break; 932 } 933 KASSERT(ic->ic_ibss_chan != NULL && 934 isset(ic->ic_chan_active, 935 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 936 ("Bad IBSS channel %u", 937 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 938 } 939 /* 940 * If the desired channel is set but no longer valid then reset it. 941 */ 942 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 943 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 944 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 945 946 /* 947 * Do mode-specific rate setup. 948 */ 949 if (mode == IEEE80211_MODE_11G) { 950 /* 951 * Use a mixed 11b/11g rate set. 952 */ 953 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 954 IEEE80211_MODE_11G); 955 } else if (mode == IEEE80211_MODE_11B) { 956 /* 957 * Force pure 11b rate set. 958 */ 959 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 960 IEEE80211_MODE_11B); 961 } 962 /* 963 * Setup an initial rate set according to the 964 * current/default channel selected above. This 965 * will be changed when scanning but must exist 966 * now so driver have a consistent state of ic_ibss_chan. 967 */ 968 if (ic->ic_bss) /* NB: can be called before lateattach */ 969 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 970 971 ic->ic_curmode = mode; 972 ieee80211_reset_erp(ic); /* reset ERP state */ 973 ieee80211_wme_initparams(ic); /* reset WME stat */ 974 975 return 0; 976#undef N 977} 978 979/* 980 * Return the phy mode for with the specified channel so the 981 * caller can select a rate set. This is problematic for channels 982 * where multiple operating modes are possible (e.g. 11g+11b). 983 * In those cases we defer to the current operating mode when set. 984 */ 985enum ieee80211_phymode 986ieee80211_chan2mode(struct ieee80211com *ic, const struct ieee80211_channel *chan) 987{ 988 if (IEEE80211_IS_CHAN_T(chan)) { 989 return IEEE80211_MODE_TURBO_A; 990 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 991 return IEEE80211_MODE_11A; 992 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 993 return IEEE80211_MODE_FH; 994 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 995 /* 996 * This assumes all 11g channels are also usable 997 * for 11b, which is currently true. 998 */ 999 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1000 return IEEE80211_MODE_TURBO_G; 1001 if (ic->ic_curmode == IEEE80211_MODE_11B) 1002 return IEEE80211_MODE_11B; 1003 return IEEE80211_MODE_11G; 1004 } else 1005 return IEEE80211_MODE_11B; 1006} 1007 1008/* 1009 * convert IEEE80211 rate value to ifmedia subtype. 1010 * ieee80211 rate is in unit of 0.5Mbps. 1011 */ 1012int 1013ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 1014{ 1015#define N(a) (sizeof(a) / sizeof(a[0])) 1016 static const struct { 1017 u_int m; /* rate + mode */ 1018 u_int r; /* if_media rate */ 1019 } rates[] = { 1020 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 1021 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 1022 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 1023 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 1024 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 1025 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 1026 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 1027 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 1028 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 1029 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 1030 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 1031 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 1032 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 1033 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 1034 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 1035 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 1036 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 1037 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 1038 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 1039 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 1040 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 1041 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 1042 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1043 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1044 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1045 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1046 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1047 { 6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 }, 1048 { 9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 }, 1049 { 54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 }, 1050 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1051 }; 1052 u_int mask, i; 1053 1054 mask = rate & IEEE80211_RATE_VAL; 1055 switch (mode) { 1056 case IEEE80211_MODE_11A: 1057 case IEEE80211_MODE_TURBO_A: 1058 mask |= IFM_IEEE80211_11A; 1059 break; 1060 case IEEE80211_MODE_11B: 1061 mask |= IFM_IEEE80211_11B; 1062 break; 1063 case IEEE80211_MODE_FH: 1064 mask |= IFM_IEEE80211_FH; 1065 break; 1066 case IEEE80211_MODE_AUTO: 1067 /* NB: ic may be NULL for some drivers */ 1068 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1069 mask |= IFM_IEEE80211_FH; 1070 break; 1071 } 1072 /* NB: hack, 11g matches both 11b+11a rates */ 1073 /* fall thru... */ 1074 case IEEE80211_MODE_11G: 1075 case IEEE80211_MODE_TURBO_G: 1076 mask |= IFM_IEEE80211_11G; 1077 break; 1078 } 1079 for (i = 0; i < N(rates); i++) 1080 if (rates[i].m == mask) 1081 return rates[i].r; 1082 return IFM_AUTO; 1083#undef N 1084} 1085 1086int 1087ieee80211_media2rate(int mword) 1088{ 1089#define N(a) (sizeof(a) / sizeof(a[0])) 1090 static const int ieeerates[] = { 1091 -1, /* IFM_AUTO */ 1092 0, /* IFM_MANUAL */ 1093 0, /* IFM_NONE */ 1094 2, /* IFM_IEEE80211_FH1 */ 1095 4, /* IFM_IEEE80211_FH2 */ 1096 2, /* IFM_IEEE80211_DS1 */ 1097 4, /* IFM_IEEE80211_DS2 */ 1098 11, /* IFM_IEEE80211_DS5 */ 1099 22, /* IFM_IEEE80211_DS11 */ 1100 44, /* IFM_IEEE80211_DS22 */ 1101 12, /* IFM_IEEE80211_OFDM6 */ 1102 18, /* IFM_IEEE80211_OFDM9 */ 1103 24, /* IFM_IEEE80211_OFDM12 */ 1104 36, /* IFM_IEEE80211_OFDM18 */ 1105 48, /* IFM_IEEE80211_OFDM24 */ 1106 72, /* IFM_IEEE80211_OFDM36 */ 1107 96, /* IFM_IEEE80211_OFDM48 */ 1108 108, /* IFM_IEEE80211_OFDM54 */ 1109 144, /* IFM_IEEE80211_OFDM72 */ 1110 0, /* IFM_IEEE80211_DS354k */ 1111 0, /* IFM_IEEE80211_DS512k */ 1112 6, /* IFM_IEEE80211_OFDM3 */ 1113 9, /* IFM_IEEE80211_OFDM4 */ 1114 54, /* IFM_IEEE80211_OFDM27 */ 1115 }; 1116 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1117 ieeerates[IFM_SUBTYPE(mword)] : 0; 1118#undef N 1119} 1120