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sys/net80211/ieee80211.c
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1 /* $NetBSD: ieee80211.c,v 1.47 2006/11/16 01:33:40 christos 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 1.47 2006/11/16 01:33:40 christos 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 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 467 rs = &ic->ic_sup_rates[mode]; 468 for (i = 0; i < rs->rs_nrates; i++) { 469 rate = rs->rs_rates[i]; 470 mword = ieee80211_rate2media(ic, rate, mode); 471 if (mword == 0) 472 continue; 473 printf("%s%d%sMbps", (i != 0 ? " " : ""), 474 (rate & IEEE80211_RATE_VAL) / 2, 475 ((rate & 0x1) != 0 ? ".5" : "")); 476 } 477 printf("\n"); 478 } 479 } 480 481 static int 482 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 483 { 484 #define IEEERATE(_ic,_m,_i) \ 485 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 486 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 487 for (i = 0; i < nrates; i++) 488 if (IEEERATE(ic, mode, i) == rate) 489 return i; 490 return -1; 491 #undef IEEERATE 492 } 493 494 /* 495 * Find an instance by it's mac address. 496 */ 497 struct ieee80211com * 498 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 499 { 500 int s; 501 struct ieee80211com *ic; 502 503 s = splnet(); 504 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 505 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 506 break; 507 splx(s); 508 return ic; 509 } 510 511 static struct ieee80211com * 512 ieee80211_find_instance(struct ifnet *ifp) 513 { 514 int s; 515 struct ieee80211com *ic; 516 517 s = splnet(); 518 /* XXX not right for multiple instances but works for now */ 519 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 520 if (ic->ic_ifp == ifp) 521 break; 522 splx(s); 523 return ic; 524 } 525 526 /* 527 * Handle a media change request. 528 */ 529 int 530 ieee80211_media_change(struct ifnet *ifp) 531 { 532 struct ieee80211com *ic; 533 struct ifmedia_entry *ime; 534 enum ieee80211_opmode newopmode; 535 enum ieee80211_phymode newphymode; 536 int i, j, newrate, error = 0; 537 538 ic = ieee80211_find_instance(ifp); 539 if (!ic) { 540 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 541 return EINVAL; 542 } 543 ime = ic->ic_media.ifm_cur; 544 /* 545 * First, identify the phy mode. 546 */ 547 switch (IFM_MODE(ime->ifm_media)) { 548 case IFM_IEEE80211_11A: 549 newphymode = IEEE80211_MODE_11A; 550 break; 551 case IFM_IEEE80211_11B: 552 newphymode = IEEE80211_MODE_11B; 553 break; 554 case IFM_IEEE80211_11G: 555 newphymode = IEEE80211_MODE_11G; 556 break; 557 case IFM_IEEE80211_FH: 558 newphymode = IEEE80211_MODE_FH; 559 break; 560 case IFM_AUTO: 561 newphymode = IEEE80211_MODE_AUTO; 562 break; 563 default: 564 return EINVAL; 565 } 566 /* 567 * Turbo mode is an ``option''. 568 * XXX does not apply to AUTO 569 */ 570 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 571 if (newphymode == IEEE80211_MODE_11A) 572 newphymode = IEEE80211_MODE_TURBO_A; 573 else if (newphymode == IEEE80211_MODE_11G) 574 newphymode = IEEE80211_MODE_TURBO_G; 575 else 576 return EINVAL; 577 } 578 /* 579 * Validate requested mode is available. 580 */ 581 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 582 return EINVAL; 583 584 /* 585 * Next, the fixed/variable rate. 586 */ 587 i = -1; 588 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 589 /* 590 * Convert media subtype to rate. 591 */ 592 newrate = ieee80211_media2rate(ime->ifm_media); 593 if (newrate == 0) 594 return EINVAL; 595 /* 596 * Check the rate table for the specified/current phy. 597 */ 598 if (newphymode == IEEE80211_MODE_AUTO) { 599 /* 600 * In autoselect mode search for the rate. 601 */ 602 for (j = IEEE80211_MODE_11A; 603 j < IEEE80211_MODE_MAX; j++) { 604 if ((ic->ic_modecaps & (1<<j)) == 0) 605 continue; 606 i = findrate(ic, j, newrate); 607 if (i != -1) { 608 /* lock mode too */ 609 newphymode = j; 610 break; 611 } 612 } 613 } else { 614 i = findrate(ic, newphymode, newrate); 615 } 616 if (i == -1) /* mode/rate mismatch */ 617 return EINVAL; 618 } 619 /* NB: defer rate setting to later */ 620 621 /* 622 * Deduce new operating mode but don't install it just yet. 623 */ 624 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 625 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 626 newopmode = IEEE80211_M_AHDEMO; 627 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 628 newopmode = IEEE80211_M_HOSTAP; 629 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 630 newopmode = IEEE80211_M_IBSS; 631 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 632 newopmode = IEEE80211_M_MONITOR; 633 else 634 newopmode = IEEE80211_M_STA; 635 636 #ifndef IEEE80211_NO_HOSTAP 637 /* 638 * Autoselect doesn't make sense when operating as an AP. 639 * If no phy mode has been selected, pick one and lock it 640 * down so rate tables can be used in forming beacon frames 641 * and the like. 642 */ 643 if (newopmode == IEEE80211_M_HOSTAP && 644 newphymode == IEEE80211_MODE_AUTO) { 645 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 646 if (ic->ic_modecaps & (1<<j)) { 647 newphymode = j; 648 break; 649 } 650 } 651 #endif /* !IEEE80211_NO_HOSTAP */ 652 653 /* 654 * Handle phy mode change. 655 */ 656 if (ic->ic_curmode != newphymode) { /* change phy mode */ 657 error = ieee80211_setmode(ic, newphymode); 658 if (error != 0) 659 return error; 660 error = ENETRESET; 661 } 662 663 /* 664 * Committed to changes, install the rate setting. 665 */ 666 if (ic->ic_fixed_rate != i) { 667 ic->ic_fixed_rate = i; /* set fixed tx rate */ 668 error = ENETRESET; 669 } 670 671 /* 672 * Handle operating mode change. 673 */ 674 if (ic->ic_opmode != newopmode) { 675 ic->ic_opmode = newopmode; 676 switch (newopmode) { 677 case IEEE80211_M_AHDEMO: 678 case IEEE80211_M_HOSTAP: 679 case IEEE80211_M_STA: 680 case IEEE80211_M_MONITOR: 681 ic->ic_flags &= ~IEEE80211_F_IBSSON; 682 break; 683 case IEEE80211_M_IBSS: 684 ic->ic_flags |= IEEE80211_F_IBSSON; 685 break; 686 } 687 /* 688 * Yech, slot time may change depending on the 689 * operating mode so reset it to be sure everything 690 * is setup appropriately. 691 */ 692 ieee80211_reset_erp(ic); 693 ieee80211_wme_initparams(ic); /* after opmode change */ 694 error = ENETRESET; 695 } 696 #ifdef notdef 697 if (error == 0) 698 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 699 #endif 700 return error; 701 } 702 703 void 704 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 705 { 706 struct ieee80211com *ic; 707 struct ieee80211_rateset *rs; 708 709 ic = ieee80211_find_instance(ifp); 710 if (!ic) { 711 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 712 return; 713 } 714 imr->ifm_status = IFM_AVALID; 715 imr->ifm_active = IFM_IEEE80211; 716 if (ic->ic_state == IEEE80211_S_RUN) 717 imr->ifm_status |= IFM_ACTIVE; 718 /* 719 * Calculate a current rate if possible. 720 */ 721 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 722 /* 723 * A fixed rate is set, report that. 724 */ 725 rs = &ic->ic_sup_rates[ic->ic_curmode]; 726 imr->ifm_active |= ieee80211_rate2media(ic, 727 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 728 } else if (ic->ic_opmode == IEEE80211_M_STA) { 729 /* 730 * In station mode report the current transmit rate. 731 */ 732 rs = &ic->ic_bss->ni_rates; 733 imr->ifm_active |= ieee80211_rate2media(ic, 734 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 735 } else 736 imr->ifm_active |= IFM_AUTO; 737 switch (ic->ic_opmode) { 738 case IEEE80211_M_STA: 739 break; 740 case IEEE80211_M_IBSS: 741 imr->ifm_active |= IFM_IEEE80211_ADHOC; 742 break; 743 case IEEE80211_M_AHDEMO: 744 /* should not come here */ 745 break; 746 case IEEE80211_M_HOSTAP: 747 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 748 break; 749 case IEEE80211_M_MONITOR: 750 imr->ifm_active |= IFM_IEEE80211_MONITOR; 751 break; 752 } 753 switch (ic->ic_curmode) { 754 case IEEE80211_MODE_11A: 755 imr->ifm_active |= IFM_IEEE80211_11A; 756 break; 757 case IEEE80211_MODE_11B: 758 imr->ifm_active |= IFM_IEEE80211_11B; 759 break; 760 case IEEE80211_MODE_11G: 761 imr->ifm_active |= IFM_IEEE80211_11G; 762 break; 763 case IEEE80211_MODE_FH: 764 imr->ifm_active |= IFM_IEEE80211_FH; 765 break; 766 case IEEE80211_MODE_TURBO_A: 767 imr->ifm_active |= IFM_IEEE80211_11A 768 | IFM_IEEE80211_TURBO; 769 break; 770 case IEEE80211_MODE_TURBO_G: 771 imr->ifm_active |= IFM_IEEE80211_11G 772 | IFM_IEEE80211_TURBO; 773 break; 774 } 775 } 776 777 void 778 ieee80211_watchdog(struct ieee80211com *ic) 779 { 780 struct ieee80211_node_table *nt; 781 int need_inact_timer = 0; 782 783 if (ic->ic_state != IEEE80211_S_INIT) { 784 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 785 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 786 nt = &ic->ic_scan; 787 if (nt->nt_inact_timer) { 788 if (--nt->nt_inact_timer == 0) 789 nt->nt_timeout(nt); 790 need_inact_timer += nt->nt_inact_timer; 791 } 792 nt = &ic->ic_sta; 793 if (nt->nt_inact_timer) { 794 if (--nt->nt_inact_timer == 0) 795 nt->nt_timeout(nt); 796 need_inact_timer += nt->nt_inact_timer; 797 } 798 } 799 if (ic->ic_mgt_timer != 0 || need_inact_timer) 800 ic->ic_ifp->if_timer = 1; 801 } 802 803 /* 804 * Set the current phy mode and recalculate the active channel 805 * set based on the available channels for this mode. Also 806 * select a new default/current channel if the current one is 807 * inappropriate for this mode. 808 */ 809 int 810 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 811 { 812 #define N(a) (sizeof(a) / sizeof(a[0])) 813 static const u_int chanflags[] = { 814 0, /* IEEE80211_MODE_AUTO */ 815 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 816 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 817 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 818 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 819 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 820 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 821 }; 822 struct ieee80211_channel *c; 823 u_int modeflags; 824 int i; 825 826 /* validate new mode */ 827 if ((ic->ic_modecaps & (1<<mode)) == 0) { 828 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 829 "%s: mode %u not supported (caps 0x%x)\n", 830 __func__, mode, ic->ic_modecaps); 831 return EINVAL; 832 } 833 834 /* 835 * Verify at least one channel is present in the available 836 * channel list before committing to the new mode. 837 */ 838 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 839 modeflags = chanflags[mode]; 840 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 841 c = &ic->ic_channels[i]; 842 if (c->ic_flags == 0) 843 continue; 844 if (mode == IEEE80211_MODE_AUTO) { 845 /* ignore turbo channels for autoselect */ 846 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 847 break; 848 } else { 849 if ((c->ic_flags & modeflags) == modeflags) 850 break; 851 } 852 } 853 if (i > IEEE80211_CHAN_MAX) { 854 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 855 "%s: no channels found for mode %u\n", __func__, mode); 856 return EINVAL; 857 } 858 859 /* 860 * Calculate the active channel set. 861 */ 862 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 863 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 864 c = &ic->ic_channels[i]; 865 if (c->ic_flags == 0) 866 continue; 867 if (mode == IEEE80211_MODE_AUTO) { 868 /* take anything but pure turbo channels */ 869 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 870 setbit(ic->ic_chan_active, i); 871 } else { 872 if ((c->ic_flags & modeflags) == modeflags) 873 setbit(ic->ic_chan_active, i); 874 } 875 } 876 /* 877 * If no current/default channel is setup or the current 878 * channel is wrong for the mode then pick the first 879 * available channel from the active list. This is likely 880 * not the right one. 881 */ 882 if (ic->ic_ibss_chan == NULL || 883 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 884 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 885 if (isset(ic->ic_chan_active, i)) { 886 ic->ic_ibss_chan = &ic->ic_channels[i]; 887 break; 888 } 889 IASSERT(ic->ic_ibss_chan != NULL && 890 isset(ic->ic_chan_active, 891 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 892 ("Bad IBSS channel %u", 893 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 894 } 895 /* 896 * If the desired channel is set but no longer valid then reset it. 897 */ 898 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 899 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 900 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 901 902 /* 903 * Do mode-specific rate setup. 904 */ 905 if (mode == IEEE80211_MODE_11G) { 906 /* 907 * Use a mixed 11b/11g rate set. 908 */ 909 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 910 IEEE80211_MODE_11G); 911 } else if (mode == IEEE80211_MODE_11B) { 912 /* 913 * Force pure 11b rate set. 914 */ 915 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 916 IEEE80211_MODE_11B); 917 } 918 /* 919 * Setup an initial rate set according to the 920 * current/default channel selected above. This 921 * will be changed when scanning but must exist 922 * now so driver have a consistent state of ic_ibss_chan. 923 */ 924 if (ic->ic_bss) /* NB: can be called before lateattach */ 925 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 926 927 ic->ic_curmode = mode; 928 ieee80211_reset_erp(ic); /* reset ERP state */ 929 ieee80211_wme_initparams(ic); /* reset WME stat */ 930 931 return 0; 932 #undef N 933 } 934 935 /* 936 * Return the phy mode for with the specified channel so the 937 * caller can select a rate set. This is problematic for channels 938 * where multiple operating modes are possible (e.g. 11g+11b). 939 * In those cases we defer to the current operating mode when set. 940 */ 941 enum ieee80211_phymode 942 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 943 { 944 if (IEEE80211_IS_CHAN_T(chan)) { 945 return IEEE80211_MODE_TURBO_A; 946 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 947 return IEEE80211_MODE_11A; 948 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 949 return IEEE80211_MODE_FH; 950 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 951 /* 952 * This assumes all 11g channels are also usable 953 * for 11b, which is currently true. 954 */ 955 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 956 return IEEE80211_MODE_TURBO_G; 957 if (ic->ic_curmode == IEEE80211_MODE_11B) 958 return IEEE80211_MODE_11B; 959 return IEEE80211_MODE_11G; 960 } else 961 return IEEE80211_MODE_11B; 962 } 963 964 /* 965 * convert IEEE80211 rate value to ifmedia subtype. 966 * ieee80211 rate is in unit of 0.5Mbps. 967 */ 968 int 969 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 970 { 971 #define N(a) (sizeof(a) / sizeof(a[0])) 972 static const struct { 973 u_int m; /* rate + mode */ 974 u_int r; /* if_media rate */ 975 } rates[] = { 976 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 977 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 978 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 979 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 980 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 981 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 982 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 983 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 984 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 985 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 986 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 987 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 988 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 989 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 990 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 991 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 992 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 993 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 994 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 995 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 996 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 997 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 998 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 999 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1000 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1001 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1002 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1003 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1004 }; 1005 u_int mask, i; 1006 1007 mask = rate & IEEE80211_RATE_VAL; 1008 switch (mode) { 1009 case IEEE80211_MODE_11A: 1010 case IEEE80211_MODE_TURBO_A: 1011 mask |= IFM_IEEE80211_11A; 1012 break; 1013 case IEEE80211_MODE_11B: 1014 mask |= IFM_IEEE80211_11B; 1015 break; 1016 case IEEE80211_MODE_FH: 1017 mask |= IFM_IEEE80211_FH; 1018 break; 1019 case IEEE80211_MODE_AUTO: 1020 /* NB: ic may be NULL for some drivers */ 1021 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1022 mask |= IFM_IEEE80211_FH; 1023 break; 1024 } 1025 /* NB: hack, 11g matches both 11b+11a rates */ 1026 /* fall thru... */ 1027 case IEEE80211_MODE_11G: 1028 case IEEE80211_MODE_TURBO_G: 1029 mask |= IFM_IEEE80211_11G; 1030 break; 1031 } 1032 for (i = 0; i < N(rates); i++) 1033 if (rates[i].m == mask) 1034 return rates[i].r; 1035 return IFM_AUTO; 1036 #undef N 1037 } 1038 1039 int 1040 ieee80211_media2rate(int mword) 1041 { 1042 #define N(a) (sizeof(a) / sizeof(a[0])) 1043 static const int ieeerates[] = { 1044 -1, /* IFM_AUTO */ 1045 0, /* IFM_MANUAL */ 1046 0, /* IFM_NONE */ 1047 2, /* IFM_IEEE80211_FH1 */ 1048 4, /* IFM_IEEE80211_FH2 */ 1049 4, /* IFM_IEEE80211_DS2 */ 1050 11, /* IFM_IEEE80211_DS5 */ 1051 22, /* IFM_IEEE80211_DS11 */ 1052 2, /* IFM_IEEE80211_DS1 */ 1053 44, /* IFM_IEEE80211_DS22 */ 1054 12, /* IFM_IEEE80211_OFDM6 */ 1055 18, /* IFM_IEEE80211_OFDM9 */ 1056 24, /* IFM_IEEE80211_OFDM12 */ 1057 36, /* IFM_IEEE80211_OFDM18 */ 1058 48, /* IFM_IEEE80211_OFDM24 */ 1059 72, /* IFM_IEEE80211_OFDM36 */ 1060 96, /* IFM_IEEE80211_OFDM48 */ 1061 108, /* IFM_IEEE80211_OFDM54 */ 1062 144, /* IFM_IEEE80211_OFDM72 */ 1063 }; 1064 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1065 ieeerates[IFM_SUBTYPE(mword)] : 0; 1066 #undef N 1067 }
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