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 /* $NetBSD: ieee80211.c,v 1.48 2007/12/01 14:35:51 jmcneill Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211.c,v 1.22 2005/08/10 16:22:29 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.48 2007/12/01 14:35:51 jmcneill Exp $"); 40 #endif 41 42 /* 43 * IEEE 802.11 generic handler 44 */ 45 46 #include "opt_inet.h" 47 #include "bpfilter.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/kernel.h> 52 53 #include <sys/socket.h> 54 #include <sys/sockio.h> 55 #include <sys/endian.h> 56 #include <sys/errno.h> 57 #include <sys/proc.h> 58 #include <sys/sysctl.h> 59 60 #include <net/if.h> 61 #include <net/if_media.h> 62 #include <net/if_arp.h> 63 #include <net/if_ether.h> 64 #include <net/if_llc.h> 65 66 #include <net80211/ieee80211_netbsd.h> 67 #include <net80211/ieee80211_var.h> 68 #include <net80211/ieee80211_sysctl.h> 69 70 #include <net/bpf.h> 71 72 #ifdef INET 73 #include <netinet/in.h> 74 #include <net/if_ether.h> 75 #endif 76 77 struct ieee80211com_head ieee80211com_head = 78 LIST_HEAD_INITIALIZER(ieee80211com_head); 79 80 const char *ieee80211_phymode_name[] = { 81 "auto", /* IEEE80211_MODE_AUTO */ 82 "11a", /* IEEE80211_MODE_11A */ 83 "11b", /* IEEE80211_MODE_11B */ 84 "11g", /* IEEE80211_MODE_11G */ 85 "FH", /* IEEE80211_MODE_FH */ 86 "turboA", /* IEEE80211_MODE_TURBO_A */ 87 "turboG", /* IEEE80211_MODE_TURBO_G */ 88 }; 89 90 /* list of all instances */ 91 SLIST_HEAD(ieee80211_list, ieee80211com); 92 static struct ieee80211_list ieee80211_list = 93 SLIST_HEAD_INITIALIZER(ieee80211_list); 94 static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 95 96 static void 97 ieee80211_add_vap(struct ieee80211com *ic) 98 { 99 #define N(a) (sizeof(a)/sizeof(a[0])) 100 int i; 101 int s; 102 u_int8_t b; 103 104 s = splnet(); 105 ic->ic_vap = 0; 106 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 107 ic->ic_vap += NBBY; 108 if (i == N(ieee80211_vapmap)) 109 panic("vap table full"); 110 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 111 ic->ic_vap++; 112 setbit(ieee80211_vapmap, ic->ic_vap); 113 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 114 splx(s); 115 #undef N 116 } 117 118 static void 119 ieee80211_remove_vap(struct ieee80211com *ic) 120 { 121 int s; 122 123 s = splnet(); 124 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 125 IASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 126 ("invalid vap id %d", ic->ic_vap)); 127 IASSERT(isset(ieee80211_vapmap, ic->ic_vap), 128 ("vap id %d not allocated", ic->ic_vap)); 129 clrbit(ieee80211_vapmap, ic->ic_vap); 130 splx(s); 131 } 132 133 /* 134 * Default reset method for use with the ioctl support. This 135 * method is invoked after any state change in the 802.11 136 * layer that should be propagated to the hardware but not 137 * require re-initialization of the 802.11 state machine (e.g 138 * rescanning for an ap). We always return ENETRESET which 139 * should cause the driver to re-initialize the device. Drivers 140 * can override this method to implement more optimized support. 141 */ 142 static int 143 ieee80211_default_reset(struct ifnet *ifp) 144 { 145 return ENETRESET; 146 } 147 148 void 149 ieee80211_ifattach(struct ieee80211com *ic) 150 { 151 struct ifnet *ifp = ic->ic_ifp; 152 struct ieee80211_channel *c; 153 int i; 154 155 #ifdef __NetBSD__ 156 ieee80211_init(); 157 #endif /* __NetBSD__ */ 158 159 ether_ifattach(ifp, ic->ic_myaddr); 160 #if NBPFILTER > 0 161 bpfattach2(ifp, DLT_IEEE802_11, 162 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 163 #endif 164 165 ieee80211_crypto_attach(ic); 166 167 /* 168 * Fill in 802.11 available channel set, mark 169 * all available channels as active, and pick 170 * a default channel if not already specified. 171 */ 172 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 173 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 174 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 175 c = &ic->ic_channels[i]; 176 if (c->ic_flags) { 177 /* 178 * Verify driver passed us valid data. 179 */ 180 if (i != ieee80211_chan2ieee(ic, c)) { 181 if_printf(ifp, "bad channel ignored; " 182 "freq %u flags %x number %u\n", 183 c->ic_freq, c->ic_flags, i); 184 c->ic_flags = 0; /* NB: remove */ 185 continue; 186 } 187 setbit(ic->ic_chan_avail, i); 188 /* 189 * Identify mode capabilities. 190 */ 191 if (IEEE80211_IS_CHAN_A(c)) 192 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 193 if (IEEE80211_IS_CHAN_B(c)) 194 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 195 if (IEEE80211_IS_CHAN_PUREG(c)) 196 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 197 if (IEEE80211_IS_CHAN_FHSS(c)) 198 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 199 if (IEEE80211_IS_CHAN_T(c)) 200 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 201 if (IEEE80211_IS_CHAN_108G(c)) 202 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 203 if (ic->ic_curchan == NULL) { 204 /* arbitrarily pick the first channel */ 205 ic->ic_curchan = &ic->ic_channels[i]; 206 } 207 } 208 } 209 /* validate ic->ic_curmode */ 210 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 211 ic->ic_curmode = IEEE80211_MODE_AUTO; 212 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 213 #if 0 214 /* 215 * Enable WME by default if we're capable. 216 */ 217 if (ic->ic_caps & IEEE80211_C_WME) 218 ic->ic_flags |= IEEE80211_F_WME; 219 #endif 220 (void) ieee80211_setmode(ic, ic->ic_curmode); 221 222 if (ic->ic_bintval == 0) 223 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 224 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 225 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 226 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 227 228 if (ic->ic_lintval == 0) 229 ic->ic_lintval = ic->ic_bintval; 230 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 231 232 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 233 ieee80211_node_attach(ic); 234 ieee80211_proto_attach(ic); 235 236 ieee80211_add_vap(ic); 237 238 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 239 240 /* 241 * Install a default reset method for the ioctl support. 242 * The driver is expected to fill this in before calling us. 243 */ 244 if (ic->ic_reset == NULL) 245 ic->ic_reset = ieee80211_default_reset; 246 } 247 248 void 249 ieee80211_ifdetach(struct ieee80211com *ic) 250 { 251 struct ifnet *ifp = ic->ic_ifp; 252 253 ieee80211_remove_vap(ic); 254 255 ieee80211_sysctl_detach(ic); 256 ieee80211_proto_detach(ic); 257 ieee80211_crypto_detach(ic); 258 ieee80211_node_detach(ic); 259 LIST_REMOVE(ic, ic_list); 260 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 261 262 IEEE80211_BEACON_LOCK_DESTROY(ic); 263 264 #if NBPFILTER > 0 265 bpfdetach(ifp); 266 #endif 267 ether_ifdetach(ifp); 268 } 269 270 /* 271 * Convert MHz frequency to IEEE channel number. 272 */ 273 u_int 274 ieee80211_mhz2ieee(u_int freq, u_int flags) 275 { 276 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 277 if (freq == 2484) 278 return 14; 279 if (freq < 2484) 280 return (freq - 2407) / 5; 281 else 282 return 15 + ((freq - 2512) / 20); 283 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5 GHz band */ 284 return (freq - 5000) / 5; 285 } else { /* either, guess */ 286 if (freq == 2484) 287 return 14; 288 if (freq < 2484) 289 return (freq - 2407) / 5; 290 if (freq < 5000) 291 return 15 + ((freq - 2512) / 20); 292 return (freq - 5000) / 5; 293 } 294 } 295 296 /* 297 * Convert channel to IEEE channel number. 298 */ 299 u_int 300 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 301 { 302 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 303 return c - ic->ic_channels; 304 else if (c == IEEE80211_CHAN_ANYC) 305 return IEEE80211_CHAN_ANY; 306 else if (c != NULL) { 307 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 308 c->ic_freq, c->ic_flags); 309 return 0; /* XXX */ 310 } else { 311 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 312 return 0; /* XXX */ 313 } 314 } 315 316 /* 317 * Convert IEEE channel number to MHz frequency. 318 */ 319 u_int 320 ieee80211_ieee2mhz(u_int chan, u_int flags) 321 { 322 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 323 if (chan == 14) 324 return 2484; 325 if (chan < 14) 326 return 2407 + chan*5; 327 else 328 return 2512 + ((chan-15)*20); 329 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5 GHz band */ 330 return 5000 + (chan*5); 331 } else { /* either, guess */ 332 if (chan == 14) 333 return 2484; 334 if (chan < 14) /* 0-13 */ 335 return 2407 + chan*5; 336 if (chan < 27) /* 15-26 */ 337 return 2512 + ((chan-15)*20); 338 return 5000 + (chan*5); 339 } 340 } 341 342 /* 343 * Setup the media data structures according to the channel and 344 * rate tables. This must be called by the driver after 345 * ieee80211_attach and before most anything else. 346 */ 347 void 348 ieee80211_media_init(struct ieee80211com *ic, 349 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 350 { 351 #define ADD(_ic, _s, _o) \ 352 ifmedia_add(&(_ic)->ic_media, \ 353 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 354 struct ifnet *ifp = ic->ic_ifp; 355 struct ifmediareq imr; 356 int i, j, mode, rate, maxrate, mword, mopt, r; 357 struct ieee80211_rateset *rs; 358 struct ieee80211_rateset allrates; 359 360 /* 361 * Do late attach work that must wait for any subclass 362 * (i.e. driver) work such as overriding methods. 363 */ 364 ieee80211_node_lateattach(ic); 365 366 #ifdef IEEE80211_NO_HOSTAP 367 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 368 #endif /* IEEE80211_NO_HOSTAP */ 369 370 /* 371 * Fill in media characteristics. 372 */ 373 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 374 maxrate = 0; 375 memset(&allrates, 0, sizeof(allrates)); 376 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 377 static const u_int mopts[] = { 378 IFM_AUTO, 379 IFM_IEEE80211_11A, 380 IFM_IEEE80211_11B, 381 IFM_IEEE80211_11G, 382 IFM_IEEE80211_FH, 383 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 384 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 385 }; 386 if ((ic->ic_modecaps & (1<<mode)) == 0) 387 continue; 388 mopt = mopts[mode]; 389 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 390 if (ic->ic_caps & IEEE80211_C_IBSS) 391 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 392 if (ic->ic_caps & IEEE80211_C_HOSTAP) 393 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 394 if (ic->ic_caps & IEEE80211_C_AHDEMO) 395 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 396 if (ic->ic_caps & IEEE80211_C_MONITOR) 397 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 398 if (mode == IEEE80211_MODE_AUTO) 399 continue; 400 rs = &ic->ic_sup_rates[mode]; 401 for (i = 0; i < rs->rs_nrates; i++) { 402 rate = rs->rs_rates[i]; 403 mword = ieee80211_rate2media(ic, rate, mode); 404 if (mword == 0) 405 continue; 406 ADD(ic, mword, mopt); 407 if (ic->ic_caps & IEEE80211_C_IBSS) 408 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 409 if (ic->ic_caps & IEEE80211_C_HOSTAP) 410 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 411 if (ic->ic_caps & IEEE80211_C_AHDEMO) 412 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 413 if (ic->ic_caps & IEEE80211_C_MONITOR) 414 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 415 /* 416 * Add rate to the collection of all rates. 417 */ 418 r = rate & IEEE80211_RATE_VAL; 419 for (j = 0; j < allrates.rs_nrates; j++) 420 if (allrates.rs_rates[j] == r) 421 break; 422 if (j == allrates.rs_nrates) { 423 /* unique, add to the set */ 424 allrates.rs_rates[j] = r; 425 allrates.rs_nrates++; 426 } 427 rate = (rate & IEEE80211_RATE_VAL) / 2; 428 if (rate > maxrate) 429 maxrate = rate; 430 } 431 } 432 for (i = 0; i < allrates.rs_nrates; i++) { 433 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 434 IEEE80211_MODE_AUTO); 435 if (mword == 0) 436 continue; 437 mword = IFM_SUBTYPE(mword); /* remove media options */ 438 ADD(ic, mword, 0); 439 if (ic->ic_caps & IEEE80211_C_IBSS) 440 ADD(ic, mword, IFM_IEEE80211_ADHOC); 441 if (ic->ic_caps & IEEE80211_C_HOSTAP) 442 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 443 if (ic->ic_caps & IEEE80211_C_AHDEMO) 444 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 445 if (ic->ic_caps & IEEE80211_C_MONITOR) 446 ADD(ic, mword, IFM_IEEE80211_MONITOR); 447 } 448 ieee80211_media_status(ifp, &imr); 449 ifmedia_set(&ic->ic_media, imr.ifm_active); 450 451 if (maxrate) 452 ifp->if_baudrate = IF_Mbps(maxrate); 453 #undef ADD 454 } 455 456 void 457 ieee80211_announce(struct ieee80211com *ic) 458 { 459 struct ifnet *ifp = ic->ic_ifp; 460 int i, mode, rate, mword; 461 struct ieee80211_rateset *rs; 462 463 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 464 if ((ic->ic_modecaps & (1<<mode)) == 0) 465 continue; 466 aprint_normal("%s: %s rates: ", ifp->if_xname, 467 ieee80211_phymode_name[mode]); 468 rs = &ic->ic_sup_rates[mode]; 469 for (i = 0; i < rs->rs_nrates; i++) { 470 rate = rs->rs_rates[i]; 471 mword = ieee80211_rate2media(ic, rate, mode); 472 if (mword == 0) 473 continue; 474 aprint_normal("%s%d%sMbps", (i != 0 ? " " : ""), 475 (rate & IEEE80211_RATE_VAL) / 2, 476 ((rate & 0x1) != 0 ? ".5" : "")); 477 } 478 aprint_normal("\n"); 479 } 480 } 481 482 static int 483 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 484 { 485 #define IEEERATE(_ic,_m,_i) \ 486 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 487 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 488 for (i = 0; i < nrates; i++) 489 if (IEEERATE(ic, mode, i) == rate) 490 return i; 491 return -1; 492 #undef IEEERATE 493 } 494 495 /* 496 * Find an instance by it's mac address. 497 */ 498 struct ieee80211com * 499 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 500 { 501 int s; 502 struct ieee80211com *ic; 503 504 s = splnet(); 505 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 506 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 507 break; 508 splx(s); 509 return ic; 510 } 511 512 static struct ieee80211com * 513 ieee80211_find_instance(struct ifnet *ifp) 514 { 515 int s; 516 struct ieee80211com *ic; 517 518 s = splnet(); 519 /* XXX not right for multiple instances but works for now */ 520 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 521 if (ic->ic_ifp == ifp) 522 break; 523 splx(s); 524 return ic; 525 } 526 527 /* 528 * Handle a media change request. 529 */ 530 int 531 ieee80211_media_change(struct ifnet *ifp) 532 { 533 struct ieee80211com *ic; 534 struct ifmedia_entry *ime; 535 enum ieee80211_opmode newopmode; 536 enum ieee80211_phymode newphymode; 537 int i, j, newrate, error = 0; 538 539 ic = ieee80211_find_instance(ifp); 540 if (!ic) { 541 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 542 return EINVAL; 543 } 544 ime = ic->ic_media.ifm_cur; 545 /* 546 * First, identify the phy mode. 547 */ 548 switch (IFM_MODE(ime->ifm_media)) { 549 case IFM_IEEE80211_11A: 550 newphymode = IEEE80211_MODE_11A; 551 break; 552 case IFM_IEEE80211_11B: 553 newphymode = IEEE80211_MODE_11B; 554 break; 555 case IFM_IEEE80211_11G: 556 newphymode = IEEE80211_MODE_11G; 557 break; 558 case IFM_IEEE80211_FH: 559 newphymode = IEEE80211_MODE_FH; 560 break; 561 case IFM_AUTO: 562 newphymode = IEEE80211_MODE_AUTO; 563 break; 564 default: 565 return EINVAL; 566 } 567 /* 568 * Turbo mode is an ``option''. 569 * XXX does not apply to AUTO 570 */ 571 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 572 if (newphymode == IEEE80211_MODE_11A) 573 newphymode = IEEE80211_MODE_TURBO_A; 574 else if (newphymode == IEEE80211_MODE_11G) 575 newphymode = IEEE80211_MODE_TURBO_G; 576 else 577 return EINVAL; 578 } 579 /* 580 * Validate requested mode is available. 581 */ 582 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 583 return EINVAL; 584 585 /* 586 * Next, the fixed/variable rate. 587 */ 588 i = -1; 589 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 590 /* 591 * Convert media subtype to rate. 592 */ 593 newrate = ieee80211_media2rate(ime->ifm_media); 594 if (newrate == 0) 595 return EINVAL; 596 /* 597 * Check the rate table for the specified/current phy. 598 */ 599 if (newphymode == IEEE80211_MODE_AUTO) { 600 /* 601 * In autoselect mode search for the rate. 602 */ 603 for (j = IEEE80211_MODE_11A; 604 j < IEEE80211_MODE_MAX; j++) { 605 if ((ic->ic_modecaps & (1<<j)) == 0) 606 continue; 607 i = findrate(ic, j, newrate); 608 if (i != -1) { 609 /* lock mode too */ 610 newphymode = j; 611 break; 612 } 613 } 614 } else { 615 i = findrate(ic, newphymode, newrate); 616 } 617 if (i == -1) /* mode/rate mismatch */ 618 return EINVAL; 619 } 620 /* NB: defer rate setting to later */ 621 622 /* 623 * Deduce new operating mode but don't install it just yet. 624 */ 625 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 626 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 627 newopmode = IEEE80211_M_AHDEMO; 628 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 629 newopmode = IEEE80211_M_HOSTAP; 630 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 631 newopmode = IEEE80211_M_IBSS; 632 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 633 newopmode = IEEE80211_M_MONITOR; 634 else 635 newopmode = IEEE80211_M_STA; 636 637 #ifndef IEEE80211_NO_HOSTAP 638 /* 639 * Autoselect doesn't make sense when operating as an AP. 640 * If no phy mode has been selected, pick one and lock it 641 * down so rate tables can be used in forming beacon frames 642 * and the like. 643 */ 644 if (newopmode == IEEE80211_M_HOSTAP && 645 newphymode == IEEE80211_MODE_AUTO) { 646 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 647 if (ic->ic_modecaps & (1<<j)) { 648 newphymode = j; 649 break; 650 } 651 } 652 #endif /* !IEEE80211_NO_HOSTAP */ 653 654 /* 655 * Handle phy mode change. 656 */ 657 if (ic->ic_curmode != newphymode) { /* change phy mode */ 658 error = ieee80211_setmode(ic, newphymode); 659 if (error != 0) 660 return error; 661 error = ENETRESET; 662 } 663 664 /* 665 * Committed to changes, install the rate setting. 666 */ 667 if (ic->ic_fixed_rate != i) { 668 ic->ic_fixed_rate = i; /* set fixed tx rate */ 669 error = ENETRESET; 670 } 671 672 /* 673 * Handle operating mode change. 674 */ 675 if (ic->ic_opmode != newopmode) { 676 ic->ic_opmode = newopmode; 677 switch (newopmode) { 678 case IEEE80211_M_AHDEMO: 679 case IEEE80211_M_HOSTAP: 680 case IEEE80211_M_STA: 681 case IEEE80211_M_MONITOR: 682 ic->ic_flags &= ~IEEE80211_F_IBSSON; 683 break; 684 case IEEE80211_M_IBSS: 685 ic->ic_flags |= IEEE80211_F_IBSSON; 686 break; 687 } 688 /* 689 * Yech, slot time may change depending on the 690 * operating mode so reset it to be sure everything 691 * is setup appropriately. 692 */ 693 ieee80211_reset_erp(ic); 694 ieee80211_wme_initparams(ic); /* after opmode change */ 695 error = ENETRESET; 696 } 697 #ifdef notdef 698 if (error == 0) 699 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 700 #endif 701 return error; 702 } 703 704 void 705 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 706 { 707 struct ieee80211com *ic; 708 struct ieee80211_rateset *rs; 709 710 ic = ieee80211_find_instance(ifp); 711 if (!ic) { 712 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 713 return; 714 } 715 imr->ifm_status = IFM_AVALID; 716 imr->ifm_active = IFM_IEEE80211; 717 if (ic->ic_state == IEEE80211_S_RUN) 718 imr->ifm_status |= IFM_ACTIVE; 719 /* 720 * Calculate a current rate if possible. 721 */ 722 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 723 /* 724 * A fixed rate is set, report that. 725 */ 726 rs = &ic->ic_sup_rates[ic->ic_curmode]; 727 imr->ifm_active |= ieee80211_rate2media(ic, 728 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 729 } else if (ic->ic_opmode == IEEE80211_M_STA) { 730 /* 731 * In station mode report the current transmit rate. 732 */ 733 rs = &ic->ic_bss->ni_rates; 734 imr->ifm_active |= ieee80211_rate2media(ic, 735 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 736 } else 737 imr->ifm_active |= IFM_AUTO; 738 switch (ic->ic_opmode) { 739 case IEEE80211_M_STA: 740 break; 741 case IEEE80211_M_IBSS: 742 imr->ifm_active |= IFM_IEEE80211_ADHOC; 743 break; 744 case IEEE80211_M_AHDEMO: 745 /* should not come here */ 746 break; 747 case IEEE80211_M_HOSTAP: 748 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 749 break; 750 case IEEE80211_M_MONITOR: 751 imr->ifm_active |= IFM_IEEE80211_MONITOR; 752 break; 753 } 754 switch (ic->ic_curmode) { 755 case IEEE80211_MODE_11A: 756 imr->ifm_active |= IFM_IEEE80211_11A; 757 break; 758 case IEEE80211_MODE_11B: 759 imr->ifm_active |= IFM_IEEE80211_11B; 760 break; 761 case IEEE80211_MODE_11G: 762 imr->ifm_active |= IFM_IEEE80211_11G; 763 break; 764 case IEEE80211_MODE_FH: 765 imr->ifm_active |= IFM_IEEE80211_FH; 766 break; 767 case IEEE80211_MODE_TURBO_A: 768 imr->ifm_active |= IFM_IEEE80211_11A 769 | IFM_IEEE80211_TURBO; 770 break; 771 case IEEE80211_MODE_TURBO_G: 772 imr->ifm_active |= IFM_IEEE80211_11G 773 | IFM_IEEE80211_TURBO; 774 break; 775 } 776 } 777 778 void 779 ieee80211_watchdog(struct ieee80211com *ic) 780 { 781 struct ieee80211_node_table *nt; 782 int need_inact_timer = 0; 783 784 if (ic->ic_state != IEEE80211_S_INIT) { 785 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 786 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 787 nt = &ic->ic_scan; 788 if (nt->nt_inact_timer) { 789 if (--nt->nt_inact_timer == 0) 790 nt->nt_timeout(nt); 791 need_inact_timer += nt->nt_inact_timer; 792 } 793 nt = &ic->ic_sta; 794 if (nt->nt_inact_timer) { 795 if (--nt->nt_inact_timer == 0) 796 nt->nt_timeout(nt); 797 need_inact_timer += nt->nt_inact_timer; 798 } 799 } 800 if (ic->ic_mgt_timer != 0 || need_inact_timer) 801 ic->ic_ifp->if_timer = 1; 802 } 803 804 /* 805 * Set the current phy mode and recalculate the active channel 806 * set based on the available channels for this mode. Also 807 * select a new default/current channel if the current one is 808 * inappropriate for this mode. 809 */ 810 int 811 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 812 { 813 #define N(a) (sizeof(a) / sizeof(a[0])) 814 static const u_int chanflags[] = { 815 0, /* IEEE80211_MODE_AUTO */ 816 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 817 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 818 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 819 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 820 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 821 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 822 }; 823 struct ieee80211_channel *c; 824 u_int modeflags; 825 int i; 826 827 /* validate new mode */ 828 if ((ic->ic_modecaps & (1<<mode)) == 0) { 829 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 830 "%s: mode %u not supported (caps 0x%x)\n", 831 __func__, mode, ic->ic_modecaps); 832 return EINVAL; 833 } 834 835 /* 836 * Verify at least one channel is present in the available 837 * channel list before committing to the new mode. 838 */ 839 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 840 modeflags = chanflags[mode]; 841 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 842 c = &ic->ic_channels[i]; 843 if (c->ic_flags == 0) 844 continue; 845 if (mode == IEEE80211_MODE_AUTO) { 846 /* ignore turbo channels for autoselect */ 847 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 848 break; 849 } else { 850 if ((c->ic_flags & modeflags) == modeflags) 851 break; 852 } 853 } 854 if (i > IEEE80211_CHAN_MAX) { 855 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 856 "%s: no channels found for mode %u\n", __func__, mode); 857 return EINVAL; 858 } 859 860 /* 861 * Calculate the active channel set. 862 */ 863 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 864 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 865 c = &ic->ic_channels[i]; 866 if (c->ic_flags == 0) 867 continue; 868 if (mode == IEEE80211_MODE_AUTO) { 869 /* take anything but pure turbo channels */ 870 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 871 setbit(ic->ic_chan_active, i); 872 } else { 873 if ((c->ic_flags & modeflags) == modeflags) 874 setbit(ic->ic_chan_active, i); 875 } 876 } 877 /* 878 * If no current/default channel is setup or the current 879 * channel is wrong for the mode then pick the first 880 * available channel from the active list. This is likely 881 * not the right one. 882 */ 883 if (ic->ic_ibss_chan == NULL || 884 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 885 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 886 if (isset(ic->ic_chan_active, i)) { 887 ic->ic_ibss_chan = &ic->ic_channels[i]; 888 break; 889 } 890 IASSERT(ic->ic_ibss_chan != NULL && 891 isset(ic->ic_chan_active, 892 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 893 ("Bad IBSS channel %u", 894 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 895 } 896 /* 897 * If the desired channel is set but no longer valid then reset it. 898 */ 899 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 900 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 901 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 902 903 /* 904 * Do mode-specific rate setup. 905 */ 906 if (mode == IEEE80211_MODE_11G) { 907 /* 908 * Use a mixed 11b/11g rate set. 909 */ 910 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 911 IEEE80211_MODE_11G); 912 } else if (mode == IEEE80211_MODE_11B) { 913 /* 914 * Force pure 11b rate set. 915 */ 916 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 917 IEEE80211_MODE_11B); 918 } 919 /* 920 * Setup an initial rate set according to the 921 * current/default channel selected above. This 922 * will be changed when scanning but must exist 923 * now so driver have a consistent state of ic_ibss_chan. 924 */ 925 if (ic->ic_bss) /* NB: can be called before lateattach */ 926 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 927 928 ic->ic_curmode = mode; 929 ieee80211_reset_erp(ic); /* reset ERP state */ 930 ieee80211_wme_initparams(ic); /* reset WME stat */ 931 932 return 0; 933 #undef N 934 } 935 936 /* 937 * Return the phy mode for with the specified channel so the 938 * caller can select a rate set. This is problematic for channels 939 * where multiple operating modes are possible (e.g. 11g+11b). 940 * In those cases we defer to the current operating mode when set. 941 */ 942 enum ieee80211_phymode 943 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 944 { 945 if (IEEE80211_IS_CHAN_T(chan)) { 946 return IEEE80211_MODE_TURBO_A; 947 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 948 return IEEE80211_MODE_11A; 949 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 950 return IEEE80211_MODE_FH; 951 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 952 /* 953 * This assumes all 11g channels are also usable 954 * for 11b, which is currently true. 955 */ 956 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 957 return IEEE80211_MODE_TURBO_G; 958 if (ic->ic_curmode == IEEE80211_MODE_11B) 959 return IEEE80211_MODE_11B; 960 return IEEE80211_MODE_11G; 961 } else 962 return IEEE80211_MODE_11B; 963 } 964 965 /* 966 * convert IEEE80211 rate value to ifmedia subtype. 967 * ieee80211 rate is in unit of 0.5Mbps. 968 */ 969 int 970 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 971 { 972 #define N(a) (sizeof(a) / sizeof(a[0])) 973 static const struct { 974 u_int m; /* rate + mode */ 975 u_int r; /* if_media rate */ 976 } rates[] = { 977 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 978 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 979 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 980 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 981 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 982 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 983 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 984 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 985 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 986 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 987 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 988 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 989 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 990 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 991 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 992 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 993 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 994 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 995 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 996 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 997 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 998 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 999 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1000 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1001 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1002 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1003 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1004 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1005 }; 1006 u_int mask, i; 1007 1008 mask = rate & IEEE80211_RATE_VAL; 1009 switch (mode) { 1010 case IEEE80211_MODE_11A: 1011 case IEEE80211_MODE_TURBO_A: 1012 mask |= IFM_IEEE80211_11A; 1013 break; 1014 case IEEE80211_MODE_11B: 1015 mask |= IFM_IEEE80211_11B; 1016 break; 1017 case IEEE80211_MODE_FH: 1018 mask |= IFM_IEEE80211_FH; 1019 break; 1020 case IEEE80211_MODE_AUTO: 1021 /* NB: ic may be NULL for some drivers */ 1022 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1023 mask |= IFM_IEEE80211_FH; 1024 break; 1025 } 1026 /* NB: hack, 11g matches both 11b+11a rates */ 1027 /* fall thru... */ 1028 case IEEE80211_MODE_11G: 1029 case IEEE80211_MODE_TURBO_G: 1030 mask |= IFM_IEEE80211_11G; 1031 break; 1032 } 1033 for (i = 0; i < N(rates); i++) 1034 if (rates[i].m == mask) 1035 return rates[i].r; 1036 return IFM_AUTO; 1037 #undef N 1038 } 1039 1040 int 1041 ieee80211_media2rate(int mword) 1042 { 1043 #define N(a) (sizeof(a) / sizeof(a[0])) 1044 static const int ieeerates[] = { 1045 -1, /* IFM_AUTO */ 1046 0, /* IFM_MANUAL */ 1047 0, /* IFM_NONE */ 1048 2, /* IFM_IEEE80211_FH1 */ 1049 4, /* IFM_IEEE80211_FH2 */ 1050 4, /* IFM_IEEE80211_DS2 */ 1051 11, /* IFM_IEEE80211_DS5 */ 1052 22, /* IFM_IEEE80211_DS11 */ 1053 2, /* IFM_IEEE80211_DS1 */ 1054 44, /* IFM_IEEE80211_DS22 */ 1055 12, /* IFM_IEEE80211_OFDM6 */ 1056 18, /* IFM_IEEE80211_OFDM9 */ 1057 24, /* IFM_IEEE80211_OFDM12 */ 1058 36, /* IFM_IEEE80211_OFDM18 */ 1059 48, /* IFM_IEEE80211_OFDM24 */ 1060 72, /* IFM_IEEE80211_OFDM36 */ 1061 96, /* IFM_IEEE80211_OFDM48 */ 1062 108, /* IFM_IEEE80211_OFDM54 */ 1063 144, /* IFM_IEEE80211_OFDM72 */ 1064 }; 1065 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1066 ieeerates[IFM_SUBTYPE(mword)] : 0; 1067 #undef N 1068 }
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