ieee80211.c revision 167468
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 167468 2007-03-11 22:37:32Z 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 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 (isset(ic->ic_modecaps, 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 setbit(ic->ic_modecaps, 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 setbit(ic->ic_modecaps, IEEE80211_MODE_11A); 175 if (IEEE80211_IS_CHAN_B(c)) 176 setbit(ic->ic_modecaps, IEEE80211_MODE_11B); 177 if (IEEE80211_IS_CHAN_ANYG(c)) 178 setbit(ic->ic_modecaps, IEEE80211_MODE_11G); 179 if (IEEE80211_IS_CHAN_FHSS(c)) 180 setbit(ic->ic_modecaps, IEEE80211_MODE_FH); 181 if (IEEE80211_IS_CHAN_T(c)) 182 setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A); 183 if (IEEE80211_IS_CHAN_108G(c)) 184 setbit(ic->ic_modecaps, 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 /* NB: must be called before ieee80211_node_detach */ 271 ieee80211_proto_detach(ic); 272 ieee80211_crypto_detach(ic); 273 ieee80211_node_detach(ic); 274 ifmedia_removeall(&ic->ic_media); 275 276 IEEE80211_BEACON_LOCK_DESTROY(ic); 277 278 bpfdetach(ifp); 279 ether_ifdetach(ifp); 280} 281 282static __inline int 283mapgsm(u_int freq, u_int flags) 284{ 285 freq *= 10; 286 if (flags & IEEE80211_CHAN_QUARTER) 287 freq += 5; 288 else if (flags & IEEE80211_CHAN_HALF) 289 freq += 10; 290 else 291 freq += 20; 292 /* NB: there is no 907/20 wide but leave room */ 293 return (freq - 906*10) / 5; 294} 295 296static __inline int 297mappsb(u_int freq, u_int flags) 298{ 299 return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5; 300} 301 302/* 303 * Convert MHz frequency to IEEE channel number. 304 */ 305int 306ieee80211_mhz2ieee(u_int freq, u_int flags) 307{ 308#define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990) 309 if (flags & IEEE80211_CHAN_GSM) 310 return mapgsm(freq, flags); 311 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 312 if (freq == 2484) 313 return 14; 314 if (freq < 2484) 315 return ((int) freq - 2407) / 5; 316 else 317 return 15 + ((freq - 2512) / 20); 318 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 319 if (freq <= 5000) { 320 if (IS_FREQ_IN_PSB(freq)) 321 return mappsb(freq, flags); 322 return (freq - 4000) / 5; 323 } else 324 return (freq - 5000) / 5; 325 } else { /* either, guess */ 326 if (freq == 2484) 327 return 14; 328 if (freq < 2484) { 329 if (907 <= freq && freq <= 922) 330 return mapgsm(freq, flags); 331 return ((int) freq - 2407) / 5; 332 } 333 if (freq < 5000) { 334 if (IS_FREQ_IN_PSB(freq)) 335 return mappsb(freq, flags); 336 else if (freq > 4900) 337 return (freq - 4000) / 5; 338 else 339 return 15 + ((freq - 2512) / 20); 340 } 341 return (freq - 5000) / 5; 342 } 343#undef IS_FREQ_IN_PSB 344} 345 346/* 347 * Convert channel to IEEE channel number. 348 */ 349int 350ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c) 351{ 352 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 353 return c - ic->ic_channels; 354 else if (c == IEEE80211_CHAN_ANYC) 355 return IEEE80211_CHAN_ANY; 356 else if (c != NULL) { 357 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 358 c->ic_freq, c->ic_flags); 359 return 0; /* XXX */ 360 } else { 361 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 362 return 0; /* XXX */ 363 } 364} 365 366/* 367 * Convert IEEE channel number to MHz frequency. 368 */ 369u_int 370ieee80211_ieee2mhz(u_int chan, u_int flags) 371{ 372 if (flags & IEEE80211_CHAN_GSM) 373 return 907 + 5 * (chan / 10); 374 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 375 if (chan == 14) 376 return 2484; 377 if (chan < 14) 378 return 2407 + chan*5; 379 else 380 return 2512 + ((chan-15)*20); 381 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 382 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) { 383 chan -= 37; 384 return 4940 + chan*5 + (chan % 5 ? 2 : 0); 385 } 386 return 5000 + (chan*5); 387 } else { /* either, guess */ 388 /* XXX can't distinguish PSB+GSM channels */ 389 if (chan == 14) 390 return 2484; 391 if (chan < 14) /* 0-13 */ 392 return 2407 + chan*5; 393 if (chan < 27) /* 15-26 */ 394 return 2512 + ((chan-15)*20); 395 return 5000 + (chan*5); 396 } 397} 398 399/* 400 * Setup the media data structures according to the channel and 401 * rate tables. This must be called by the driver after 402 * ieee80211_attach and before most anything else. 403 */ 404void 405ieee80211_media_init(struct ieee80211com *ic, 406 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 407{ 408#define ADD(_ic, _s, _o) \ 409 ifmedia_add(&(_ic)->ic_media, \ 410 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 411 struct ifnet *ifp = ic->ic_ifp; 412 struct ifmediareq imr; 413 int i, j, mode, rate, maxrate, mword, mopt, r; 414 struct ieee80211_rateset *rs; 415 struct ieee80211_rateset allrates; 416 417 /* NB: this works because the structure is initialized to zero */ 418 if (LIST_EMPTY(&ic->ic_media.ifm_list)) { 419 /* 420 * Do late attach work that must wait for any subclass 421 * (i.e. driver) work such as overriding methods. 422 */ 423 ieee80211_node_lateattach(ic); 424 } else { 425 /* 426 * We are re-initializing the channel list; clear 427 * the existing media state as the media routines 428 * don't suppress duplicates. 429 */ 430 ifmedia_removeall(&ic->ic_media); 431 ieee80211_chan_init(ic); 432 } 433 434 /* 435 * Fill in media characteristics. 436 */ 437 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 438 maxrate = 0; 439 memset(&allrates, 0, sizeof(allrates)); 440 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 441 static const u_int mopts[] = { 442 IFM_AUTO, 443 IFM_IEEE80211_11A, 444 IFM_IEEE80211_11B, 445 IFM_IEEE80211_11G, 446 IFM_IEEE80211_FH, 447 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 448 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 449 }; 450 if (isclr(ic->ic_modecaps, mode)) 451 continue; 452 mopt = mopts[mode]; 453 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 454 if (ic->ic_caps & IEEE80211_C_IBSS) 455 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 456 if (ic->ic_caps & IEEE80211_C_HOSTAP) 457 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 458 if (ic->ic_caps & IEEE80211_C_AHDEMO) 459 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 460 if (ic->ic_caps & IEEE80211_C_MONITOR) 461 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 462 if (mode == IEEE80211_MODE_AUTO) 463 continue; 464 rs = &ic->ic_sup_rates[mode]; 465 for (i = 0; i < rs->rs_nrates; i++) { 466 rate = rs->rs_rates[i]; 467 mword = ieee80211_rate2media(ic, rate, mode); 468 if (mword == 0) 469 continue; 470 ADD(ic, mword, mopt); 471 if (ic->ic_caps & IEEE80211_C_IBSS) 472 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 473 if (ic->ic_caps & IEEE80211_C_HOSTAP) 474 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 475 if (ic->ic_caps & IEEE80211_C_AHDEMO) 476 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 477 if (ic->ic_caps & IEEE80211_C_MONITOR) 478 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 479 /* 480 * Add rate to the collection of all rates. 481 */ 482 r = rate & IEEE80211_RATE_VAL; 483 for (j = 0; j < allrates.rs_nrates; j++) 484 if (allrates.rs_rates[j] == r) 485 break; 486 if (j == allrates.rs_nrates) { 487 /* unique, add to the set */ 488 allrates.rs_rates[j] = r; 489 allrates.rs_nrates++; 490 } 491 rate = (rate & IEEE80211_RATE_VAL) / 2; 492 if (rate > maxrate) 493 maxrate = rate; 494 } 495 } 496 for (i = 0; i < allrates.rs_nrates; i++) { 497 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 498 IEEE80211_MODE_AUTO); 499 if (mword == 0) 500 continue; 501 mword = IFM_SUBTYPE(mword); /* remove media options */ 502 ADD(ic, mword, 0); 503 if (ic->ic_caps & IEEE80211_C_IBSS) 504 ADD(ic, mword, IFM_IEEE80211_ADHOC); 505 if (ic->ic_caps & IEEE80211_C_HOSTAP) 506 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 507 if (ic->ic_caps & IEEE80211_C_AHDEMO) 508 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 509 if (ic->ic_caps & IEEE80211_C_MONITOR) 510 ADD(ic, mword, IFM_IEEE80211_MONITOR); 511 } 512 ieee80211_media_status(ifp, &imr); 513 ifmedia_set(&ic->ic_media, imr.ifm_active); 514 515 if (maxrate) 516 ifp->if_baudrate = IF_Mbps(maxrate); 517#undef ADD 518} 519 520const struct ieee80211_rateset * 521ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c) 522{ 523 enum ieee80211_phymode mode = ieee80211_chan2mode(ic, c); 524 525 if (IEEE80211_IS_CHAN_HALF(c)) 526 return &ieee80211_rateset_half; 527 if (IEEE80211_IS_CHAN_QUARTER(c)) 528 return &ieee80211_rateset_quarter; 529 return &ic->ic_sup_rates[mode]; 530} 531 532void 533ieee80211_announce(struct ieee80211com *ic) 534{ 535 struct ifnet *ifp = ic->ic_ifp; 536 int i, mode, rate, mword; 537 struct ieee80211_rateset *rs; 538 539 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 540 if (isclr(ic->ic_modecaps, mode)) 541 continue; 542 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 543 rs = &ic->ic_sup_rates[mode]; 544 for (i = 0; i < rs->rs_nrates; i++) { 545 rate = rs->rs_rates[i]; 546 mword = ieee80211_rate2media(ic, rate, mode); 547 if (mword == 0) 548 continue; 549 printf("%s%d%sMbps", (i != 0 ? " " : ""), 550 (rate & IEEE80211_RATE_VAL) / 2, 551 ((rate & 0x1) != 0 ? ".5" : "")); 552 } 553 printf("\n"); 554 } 555} 556 557static int 558findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 559{ 560#define IEEERATE(_ic,_m,_i) \ 561 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 562 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 563 for (i = 0; i < nrates; i++) 564 if (IEEERATE(ic, mode, i) == rate) 565 return i; 566 return -1; 567#undef IEEERATE 568} 569 570/* 571 * Find an instance by it's mac address. 572 */ 573struct ieee80211com * 574ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 575{ 576 struct ieee80211com *ic; 577 578 /* XXX lock */ 579 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 580 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 581 return ic; 582 return NULL; 583} 584 585static struct ieee80211com * 586ieee80211_find_instance(struct ifnet *ifp) 587{ 588 struct ieee80211com *ic; 589 590 /* XXX lock */ 591 /* XXX not right for multiple instances but works for now */ 592 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 593 if (ic->ic_ifp == ifp) 594 return ic; 595 return NULL; 596} 597 598/* 599 * Handle a media change request. 600 */ 601int 602ieee80211_media_change(struct ifnet *ifp) 603{ 604 struct ieee80211com *ic; 605 struct ifmedia_entry *ime; 606 enum ieee80211_opmode newopmode; 607 enum ieee80211_phymode newphymode; 608 int i, j, newrate, error = 0; 609 610 ic = ieee80211_find_instance(ifp); 611 if (!ic) { 612 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 613 return EINVAL; 614 } 615 ime = ic->ic_media.ifm_cur; 616 /* 617 * First, identify the phy mode. 618 */ 619 switch (IFM_MODE(ime->ifm_media)) { 620 case IFM_IEEE80211_11A: 621 newphymode = IEEE80211_MODE_11A; 622 break; 623 case IFM_IEEE80211_11B: 624 newphymode = IEEE80211_MODE_11B; 625 break; 626 case IFM_IEEE80211_11G: 627 newphymode = IEEE80211_MODE_11G; 628 break; 629 case IFM_IEEE80211_FH: 630 newphymode = IEEE80211_MODE_FH; 631 break; 632 case IFM_AUTO: 633 newphymode = IEEE80211_MODE_AUTO; 634 break; 635 default: 636 return EINVAL; 637 } 638 /* 639 * Turbo mode is an ``option''. 640 * XXX does not apply to AUTO 641 */ 642 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 643 if (newphymode == IEEE80211_MODE_11A) 644 newphymode = IEEE80211_MODE_TURBO_A; 645 else if (newphymode == IEEE80211_MODE_11G) 646 newphymode = IEEE80211_MODE_TURBO_G; 647 else 648 return EINVAL; 649 } 650 /* 651 * Validate requested mode is available. 652 */ 653 if (isclr(ic->ic_modecaps, newphymode)) 654 return EINVAL; 655 656 /* 657 * Next, the fixed/variable rate. 658 */ 659 i = -1; 660 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 661 /* 662 * Convert media subtype to rate. 663 */ 664 newrate = ieee80211_media2rate(ime->ifm_media); 665 if (newrate == 0) 666 return EINVAL; 667 /* 668 * Check the rate table for the specified/current phy. 669 */ 670 if (newphymode == IEEE80211_MODE_AUTO) { 671 /* 672 * In autoselect mode search for the rate. 673 */ 674 for (j = IEEE80211_MODE_11A; 675 j < IEEE80211_MODE_MAX; j++) { 676 if (isclr(ic->ic_modecaps, j)) 677 continue; 678 i = findrate(ic, j, newrate); 679 if (i != -1) { 680 /* lock mode too */ 681 newphymode = j; 682 break; 683 } 684 } 685 } else { 686 i = findrate(ic, newphymode, newrate); 687 } 688 if (i == -1) /* mode/rate mismatch */ 689 return EINVAL; 690 } 691 /* NB: defer rate setting to later */ 692 693 /* 694 * Deduce new operating mode but don't install it just yet. 695 */ 696 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 697 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 698 newopmode = IEEE80211_M_AHDEMO; 699 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 700 newopmode = IEEE80211_M_HOSTAP; 701 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 702 newopmode = IEEE80211_M_IBSS; 703 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 704 newopmode = IEEE80211_M_MONITOR; 705 else 706 newopmode = IEEE80211_M_STA; 707 708 /* 709 * Autoselect doesn't make sense when operating as an AP. 710 * If no phy mode has been selected, pick one and lock it 711 * down so rate tables can be used in forming beacon frames 712 * and the like. 713 */ 714 if (newopmode == IEEE80211_M_HOSTAP && 715 newphymode == IEEE80211_MODE_AUTO) { 716 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 717 if (isset(ic->ic_modecaps, j)) { 718 newphymode = j; 719 break; 720 } 721 } 722 723 /* 724 * Handle phy mode change. 725 */ 726 if (ic->ic_curmode != newphymode) { /* change phy mode */ 727 error = ieee80211_setmode(ic, newphymode); 728 if (error != 0) 729 return error; 730 error = ENETRESET; 731 } 732 733 /* 734 * Committed to changes, install the rate setting. 735 */ 736 if (ic->ic_fixed_rate != i) { 737 ic->ic_fixed_rate = i; /* set fixed tx rate */ 738 error = ENETRESET; 739 } 740 741 /* 742 * Handle operating mode change. 743 */ 744 if (ic->ic_opmode != newopmode) { 745 ic->ic_opmode = newopmode; 746 switch (newopmode) { 747 case IEEE80211_M_AHDEMO: 748 case IEEE80211_M_HOSTAP: 749 case IEEE80211_M_STA: 750 case IEEE80211_M_MONITOR: 751 ic->ic_flags &= ~IEEE80211_F_IBSSON; 752 break; 753 case IEEE80211_M_IBSS: 754 ic->ic_flags |= IEEE80211_F_IBSSON; 755 break; 756 } 757 /* 758 * Yech, slot time may change depending on the 759 * operating mode so reset it to be sure everything 760 * is setup appropriately. 761 */ 762 ieee80211_reset_erp(ic); 763 ieee80211_wme_initparams(ic); /* after opmode change */ 764 error = ENETRESET; 765 } 766#ifdef notdef 767 if (error == 0) 768 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 769#endif 770 return error; 771} 772 773void 774ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 775{ 776 struct ieee80211com *ic; 777 const struct ieee80211_rateset *rs; 778 779 ic = ieee80211_find_instance(ifp); 780 if (!ic) { 781 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 782 return; 783 } 784 imr->ifm_status = IFM_AVALID; 785 imr->ifm_active = IFM_IEEE80211; 786 if (ic->ic_state == IEEE80211_S_RUN) 787 imr->ifm_status |= IFM_ACTIVE; 788 /* 789 * Calculate a current rate if possible. 790 */ 791 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 792 /* 793 * A fixed rate is set, report that. 794 */ 795 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 796 imr->ifm_active |= ieee80211_rate2media(ic, 797 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 798 } else if (ic->ic_opmode == IEEE80211_M_STA) { 799 /* 800 * In station mode report the current transmit rate. 801 */ 802 rs = &ic->ic_bss->ni_rates; 803 imr->ifm_active |= ieee80211_rate2media(ic, 804 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 805 } else 806 imr->ifm_active |= IFM_AUTO; 807 switch (ic->ic_opmode) { 808 case IEEE80211_M_STA: 809 break; 810 case IEEE80211_M_IBSS: 811 imr->ifm_active |= IFM_IEEE80211_ADHOC; 812 break; 813 case IEEE80211_M_AHDEMO: 814 /* should not come here */ 815 break; 816 case IEEE80211_M_HOSTAP: 817 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 818 break; 819 case IEEE80211_M_MONITOR: 820 imr->ifm_active |= IFM_IEEE80211_MONITOR; 821 break; 822 } 823 switch (ic->ic_curmode) { 824 case IEEE80211_MODE_11A: 825 imr->ifm_active |= IFM_IEEE80211_11A; 826 break; 827 case IEEE80211_MODE_11B: 828 imr->ifm_active |= IFM_IEEE80211_11B; 829 break; 830 case IEEE80211_MODE_11G: 831 imr->ifm_active |= IFM_IEEE80211_11G; 832 break; 833 case IEEE80211_MODE_FH: 834 imr->ifm_active |= IFM_IEEE80211_FH; 835 break; 836 case IEEE80211_MODE_TURBO_A: 837 imr->ifm_active |= IFM_IEEE80211_11A 838 | IFM_IEEE80211_TURBO; 839 break; 840 case IEEE80211_MODE_TURBO_G: 841 imr->ifm_active |= IFM_IEEE80211_11G 842 | IFM_IEEE80211_TURBO; 843 break; 844 } 845} 846 847void 848ieee80211_watchdog(struct ieee80211com *ic) 849{ 850 struct ieee80211_node_table *nt; 851 int need_inact_timer = 0; 852 853 if (ic->ic_state != IEEE80211_S_INIT) { 854 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 855 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 856 nt = &ic->ic_scan; 857 if (nt->nt_inact_timer) { 858 if (--nt->nt_inact_timer == 0) 859 nt->nt_timeout(nt); 860 need_inact_timer += nt->nt_inact_timer; 861 } 862 nt = &ic->ic_sta; 863 if (nt->nt_inact_timer) { 864 if (--nt->nt_inact_timer == 0) 865 nt->nt_timeout(nt); 866 need_inact_timer += nt->nt_inact_timer; 867 } 868 } 869 if (ic->ic_mgt_timer != 0 || need_inact_timer) 870 ic->ic_ifp->if_timer = 1; 871} 872 873/* 874 * Set the current phy mode and recalculate the active channel 875 * set based on the available channels for this mode. Also 876 * select a new default/current channel if the current one is 877 * inappropriate for this mode. 878 */ 879int 880ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 881{ 882#define N(a) (sizeof(a) / sizeof(a[0])) 883 static const u_int chanflags[] = { 884 0, /* IEEE80211_MODE_AUTO */ 885 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 886 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 887 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 888 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 889 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 890 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 891 }; 892 struct ieee80211_channel *c; 893 u_int modeflags; 894 int i; 895 896 /* validate new mode */ 897 if (isclr(ic->ic_modecaps, mode)) { 898 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 899 "%s: mode %u not supported (caps 0x%x)\n", 900 __func__, mode, ic->ic_modecaps); 901 return EINVAL; 902 } 903 904 /* 905 * Verify at least one channel is present in the available 906 * channel list before committing to the new mode. 907 */ 908 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 909 modeflags = chanflags[mode]; 910 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 911 c = &ic->ic_channels[i]; 912 if (c->ic_flags == 0) 913 continue; 914 if (mode == IEEE80211_MODE_AUTO) { 915 /* ignore static turbo channels for autoselect */ 916 if (!IEEE80211_IS_CHAN_T(c)) 917 break; 918 } else { 919 if ((c->ic_flags & modeflags) == modeflags) 920 break; 921 } 922 } 923 if (i > IEEE80211_CHAN_MAX) { 924 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 925 "%s: no channels found for mode %u\n", __func__, mode); 926 return EINVAL; 927 } 928 929 /* 930 * Calculate the active channel set. 931 */ 932 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 933 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 934 c = &ic->ic_channels[i]; 935 if (c->ic_flags == 0) 936 continue; 937 if (mode == IEEE80211_MODE_AUTO) { 938 /* take anything but static turbo channels */ 939 if (!IEEE80211_IS_CHAN_T(c)) 940 setbit(ic->ic_chan_active, i); 941 } else { 942 if ((c->ic_flags & modeflags) == modeflags) 943 setbit(ic->ic_chan_active, i); 944 } 945 } 946 /* 947 * If no current/default channel is setup or the current 948 * channel is wrong for the mode then pick the first 949 * available channel from the active list. This is likely 950 * not the right one. 951 */ 952 if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_curchan))) { 953 ic->ic_curchan = NULL; 954 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 955 if (isset(ic->ic_chan_active, i)) { 956 ic->ic_curchan = &ic->ic_channels[i]; 957 break; 958 } 959 KASSERT(ic->ic_curchan != NULL, ("no current channel")); 960 } 961 if (ic->ic_ibss_chan == NULL || 962 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) 963 ic->ic_ibss_chan = ic->ic_curchan; 964 /* 965 * If the desired channel is set but no longer valid then reset it. 966 */ 967 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 968 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 969 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 970 971 /* 972 * Adjust basic rates in 11b/11g supported rate set. 973 * Note that if operating on a hal/quarter rate channel 974 * this is a noop as those rates sets are different 975 * and used instead. 976 */ 977 if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B) 978 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], mode); 979 980 /* 981 * Setup an initial rate set according to the 982 * current/default channel selected above. This 983 * will be changed when scanning but must exist 984 * now so driver have a consistent state of ic_ibss_chan. 985 */ 986 if (ic->ic_bss != NULL) /* NB: can be called before lateattach */ 987 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 988 989 ic->ic_curmode = mode; 990 ieee80211_reset_erp(ic); /* reset ERP state */ 991 ieee80211_wme_initparams(ic); /* reset WME stat */ 992 993 return 0; 994#undef N 995} 996 997/* 998 * Return the phy mode for with the specified channel so the 999 * caller can select a rate set. This is problematic for channels 1000 * where multiple operating modes are possible (e.g. 11g+11b). 1001 * In those cases we defer to the current operating mode when set. 1002 */ 1003enum ieee80211_phymode 1004ieee80211_chan2mode(struct ieee80211com *ic, const struct ieee80211_channel *chan) 1005{ 1006 if (IEEE80211_IS_CHAN_T(chan)) { 1007 return IEEE80211_MODE_TURBO_A; 1008 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 1009 return IEEE80211_MODE_11A; 1010 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 1011 return IEEE80211_MODE_FH; 1012 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 1013 /* 1014 * This assumes all 11g channels are also usable 1015 * for 11b, which is currently true. 1016 */ 1017 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1018 return IEEE80211_MODE_TURBO_G; 1019 if (ic->ic_curmode == IEEE80211_MODE_11B) 1020 return IEEE80211_MODE_11B; 1021 return IEEE80211_MODE_11G; 1022 } else 1023 return IEEE80211_MODE_11B; 1024} 1025 1026/* 1027 * convert IEEE80211 rate value to ifmedia subtype. 1028 * ieee80211 rate is in unit of 0.5Mbps. 1029 */ 1030int 1031ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 1032{ 1033#define N(a) (sizeof(a) / sizeof(a[0])) 1034 static const struct { 1035 u_int m; /* rate + mode */ 1036 u_int r; /* if_media rate */ 1037 } rates[] = { 1038 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 1039 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 1040 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 1041 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 1042 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 1043 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 1044 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 1045 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 1046 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 1047 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 1048 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 1049 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 1050 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 1051 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 1052 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 1053 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 1054 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 1055 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 1056 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 1057 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 1058 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 1059 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 1060 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1061 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1062 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1063 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1064 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1065 { 6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 }, 1066 { 9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 }, 1067 { 54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 }, 1068 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1069 }; 1070 u_int mask, i; 1071 1072 mask = rate & IEEE80211_RATE_VAL; 1073 switch (mode) { 1074 case IEEE80211_MODE_11A: 1075 case IEEE80211_MODE_TURBO_A: 1076 mask |= IFM_IEEE80211_11A; 1077 break; 1078 case IEEE80211_MODE_11B: 1079 mask |= IFM_IEEE80211_11B; 1080 break; 1081 case IEEE80211_MODE_FH: 1082 mask |= IFM_IEEE80211_FH; 1083 break; 1084 case IEEE80211_MODE_AUTO: 1085 /* NB: ic may be NULL for some drivers */ 1086 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1087 mask |= IFM_IEEE80211_FH; 1088 break; 1089 } 1090 /* NB: hack, 11g matches both 11b+11a rates */ 1091 /* fall thru... */ 1092 case IEEE80211_MODE_11G: 1093 case IEEE80211_MODE_TURBO_G: 1094 mask |= IFM_IEEE80211_11G; 1095 break; 1096 } 1097 for (i = 0; i < N(rates); i++) 1098 if (rates[i].m == mask) 1099 return rates[i].r; 1100 return IFM_AUTO; 1101#undef N 1102} 1103 1104int 1105ieee80211_media2rate(int mword) 1106{ 1107#define N(a) (sizeof(a) / sizeof(a[0])) 1108 static const int ieeerates[] = { 1109 -1, /* IFM_AUTO */ 1110 0, /* IFM_MANUAL */ 1111 0, /* IFM_NONE */ 1112 2, /* IFM_IEEE80211_FH1 */ 1113 4, /* IFM_IEEE80211_FH2 */ 1114 2, /* IFM_IEEE80211_DS1 */ 1115 4, /* IFM_IEEE80211_DS2 */ 1116 11, /* IFM_IEEE80211_DS5 */ 1117 22, /* IFM_IEEE80211_DS11 */ 1118 44, /* IFM_IEEE80211_DS22 */ 1119 12, /* IFM_IEEE80211_OFDM6 */ 1120 18, /* IFM_IEEE80211_OFDM9 */ 1121 24, /* IFM_IEEE80211_OFDM12 */ 1122 36, /* IFM_IEEE80211_OFDM18 */ 1123 48, /* IFM_IEEE80211_OFDM24 */ 1124 72, /* IFM_IEEE80211_OFDM36 */ 1125 96, /* IFM_IEEE80211_OFDM48 */ 1126 108, /* IFM_IEEE80211_OFDM54 */ 1127 144, /* IFM_IEEE80211_OFDM72 */ 1128 0, /* IFM_IEEE80211_DS354k */ 1129 0, /* IFM_IEEE80211_DS512k */ 1130 6, /* IFM_IEEE80211_OFDM3 */ 1131 9, /* IFM_IEEE80211_OFDM4 */ 1132 54, /* IFM_IEEE80211_OFDM27 */ 1133 }; 1134 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1135 ieeerates[IFM_SUBTYPE(mword)] : 0; 1136#undef N 1137} 1138