ieee80211.c revision 1.31.2.7
1 /* $NetBSD: ieee80211.c,v 1.31.2.7 2005/11/10 14:10:51 skrll 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 1.11 2004/04/02 20:19:20 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.31.2.7 2005/11/10 14:10:51 skrll Exp $"); 39 #endif 40 41 /* 42 * IEEE 802.11 generic handler 43 */ 44 45 #include "opt_inet.h" 46 #include "bpfilter.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/endian.h> 55 #include <sys/errno.h> 56 #include <sys/proc.h> 57 #include <sys/sysctl.h> 58 59 #include <net/if.h> 60 #include <net/if_media.h> 61 #include <net/if_arp.h> 62 #include <net/if_ether.h> 63 #include <net/if_llc.h> 64 65 #include <net80211/ieee80211_netbsd.h> 66 #include <net80211/ieee80211_var.h> 67 #include <net80211/ieee80211_sysctl.h> 68 69 #include <net/bpf.h> 70 71 #ifdef INET 72 #include <netinet/in.h> 73 #include <net/if_ether.h> 74 #endif 75 76 struct ieee80211com_head ieee80211com_head = 77 LIST_HEAD_INITIALIZER(ieee80211com_head); 78 79 const char *ieee80211_phymode_name[] = { 80 "auto", /* IEEE80211_MODE_AUTO */ 81 "11a", /* IEEE80211_MODE_11A */ 82 "11b", /* IEEE80211_MODE_11B */ 83 "11g", /* IEEE80211_MODE_11G */ 84 "FH", /* IEEE80211_MODE_FH */ 85 "turboA", /* IEEE80211_MODE_TURBO_A */ 86 "turboG", /* IEEE80211_MODE_TURBO_G */ 87 }; 88 89 /* list of all instances */ 90 SLIST_HEAD(ieee80211_list, ieee80211com); 91 static struct ieee80211_list ieee80211_list = 92 SLIST_HEAD_INITIALIZER(ieee80211_list); 93 static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 94 95 static void 96 ieee80211_add_vap(struct ieee80211com *ic) 97 { 98 #define N(a) (sizeof(a)/sizeof(a[0])) 99 int i; 100 int s; 101 u_int8_t b; 102 103 s = splnet(); 104 ic->ic_vap = 0; 105 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 106 ic->ic_vap += NBBY; 107 if (i == N(ieee80211_vapmap)) 108 panic("vap table full"); 109 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 110 ic->ic_vap++; 111 setbit(ieee80211_vapmap, ic->ic_vap); 112 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 113 splx(s); 114 #undef N 115 } 116 117 static void 118 ieee80211_remove_vap(struct ieee80211com *ic) 119 { 120 int s; 121 122 s = splnet(); 123 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 124 IASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 125 ("invalid vap id %d", ic->ic_vap)); 126 IASSERT(isset(ieee80211_vapmap, ic->ic_vap), 127 ("vap id %d not allocated", ic->ic_vap)); 128 clrbit(ieee80211_vapmap, ic->ic_vap); 129 splx(s); 130 } 131 132 /* 133 * Default reset method for use with the ioctl support. This 134 * method is invoked after any state change in the 802.11 135 * layer that should be propagated to the hardware but not 136 * require re-initialization of the 802.11 state machine (e.g 137 * rescanning for an ap). We always return ENETRESET which 138 * should cause the driver to re-initialize the device. Drivers 139 * can override this method to implement more optimized support. 140 */ 141 static int 142 ieee80211_default_reset(struct ifnet *ifp) 143 { 144 return ENETRESET; 145 } 146 147 void 148 ieee80211_ifattach(struct ieee80211com *ic) 149 { 150 struct ifnet *ifp = ic->ic_ifp; 151 struct ieee80211_channel *c; 152 int i; 153 154 ether_ifattach(ifp, ic->ic_myaddr); 155 #if NBPFILTER > 0 156 bpfattach2(ifp, DLT_IEEE802_11, 157 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 158 #endif 159 160 ieee80211_crypto_attach(ic); 161 162 /* 163 * Fill in 802.11 available channel set, mark 164 * all available channels as active, and pick 165 * a default channel if not already specified. 166 */ 167 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 168 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 169 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 170 c = &ic->ic_channels[i]; 171 if (c->ic_flags) { 172 /* 173 * Verify driver passed us valid data. 174 */ 175 if (i != ieee80211_chan2ieee(ic, c)) { 176 if_printf(ifp, "bad channel ignored; " 177 "freq %u flags %x number %u\n", 178 c->ic_freq, c->ic_flags, i); 179 c->ic_flags = 0; /* NB: remove */ 180 continue; 181 } 182 setbit(ic->ic_chan_avail, i); 183 /* 184 * Identify mode capabilities. 185 */ 186 if (IEEE80211_IS_CHAN_A(c)) 187 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 188 if (IEEE80211_IS_CHAN_B(c)) 189 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 190 if (IEEE80211_IS_CHAN_PUREG(c)) 191 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 192 if (IEEE80211_IS_CHAN_FHSS(c)) 193 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 194 if (IEEE80211_IS_CHAN_T(c)) 195 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 196 if (IEEE80211_IS_CHAN_108G(c)) 197 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 198 } 199 } 200 /* validate ic->ic_curmode */ 201 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 202 ic->ic_curmode = IEEE80211_MODE_AUTO; 203 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 204 #if 0 205 /* 206 * Enable WME by default if we're capable. 207 */ 208 if (ic->ic_caps & IEEE80211_C_WME) 209 ic->ic_flags |= IEEE80211_F_WME; 210 #endif 211 (void) ieee80211_setmode(ic, ic->ic_curmode); 212 213 if (ic->ic_lintval == 0) 214 ic->ic_lintval = IEEE80211_BINTVAL_DEFAULT; 215 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 216 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 217 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 218 219 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 220 221 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 222 ieee80211_node_attach(ic); 223 ieee80211_proto_attach(ic); 224 225 ieee80211_add_vap(ic); 226 227 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 228 229 /* 230 * Install a default reset method for the ioctl support. 231 * The driver is expected to fill this in before calling us. 232 */ 233 if (ic->ic_reset == NULL) 234 ic->ic_reset = ieee80211_default_reset; 235 } 236 237 void 238 ieee80211_ifdetach(struct ieee80211com *ic) 239 { 240 struct ifnet *ifp = ic->ic_ifp; 241 242 ieee80211_remove_vap(ic); 243 244 ieee80211_sysctl_detach(ic); 245 ieee80211_proto_detach(ic); 246 ieee80211_crypto_detach(ic); 247 ieee80211_node_detach(ic); 248 LIST_REMOVE(ic, ic_list); 249 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 250 251 IEEE80211_BEACON_LOCK_DESTROY(ic); 252 253 #if NBPFILTER > 0 254 bpfdetach(ifp); 255 #endif 256 ether_ifdetach(ifp); 257 } 258 259 /* 260 * Convert MHz frequency to IEEE channel number. 261 */ 262 u_int 263 ieee80211_mhz2ieee(u_int freq, u_int flags) 264 { 265 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 266 if (freq == 2484) 267 return 14; 268 if (freq < 2484) 269 return (freq - 2407) / 5; 270 else 271 return 15 + ((freq - 2512) / 20); 272 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 273 return (freq - 5000) / 5; 274 } else { /* either, guess */ 275 if (freq == 2484) 276 return 14; 277 if (freq < 2484) 278 return (freq - 2407) / 5; 279 if (freq < 5000) 280 return 15 + ((freq - 2512) / 20); 281 return (freq - 5000) / 5; 282 } 283 } 284 285 /* 286 * Convert channel to IEEE channel number. 287 */ 288 u_int 289 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 290 { 291 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 292 return c - ic->ic_channels; 293 else if (c == IEEE80211_CHAN_ANYC) 294 return IEEE80211_CHAN_ANY; 295 else if (c != NULL) { 296 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 297 c->ic_freq, c->ic_flags); 298 return 0; /* XXX */ 299 } else { 300 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 301 return 0; /* XXX */ 302 } 303 } 304 305 /* 306 * Convert IEEE channel number to MHz frequency. 307 */ 308 u_int 309 ieee80211_ieee2mhz(u_int chan, u_int flags) 310 { 311 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 312 if (chan == 14) 313 return 2484; 314 if (chan < 14) 315 return 2407 + chan*5; 316 else 317 return 2512 + ((chan-15)*20); 318 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 319 return 5000 + (chan*5); 320 } else { /* either, guess */ 321 if (chan == 14) 322 return 2484; 323 if (chan < 14) /* 0-13 */ 324 return 2407 + chan*5; 325 if (chan < 27) /* 15-26 */ 326 return 2512 + ((chan-15)*20); 327 return 5000 + (chan*5); 328 } 329 } 330 331 /* 332 * Setup the media data structures according to the channel and 333 * rate tables. This must be called by the driver after 334 * ieee80211_attach and before most anything else. 335 */ 336 void 337 ieee80211_media_init(struct ieee80211com *ic, 338 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 339 { 340 #define ADD(_ic, _s, _o) \ 341 ifmedia_add(&(_ic)->ic_media, \ 342 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 343 struct ifnet *ifp = ic->ic_ifp; 344 struct ifmediareq imr; 345 int i, j, mode, rate, maxrate, mword, mopt, r; 346 struct ieee80211_rateset *rs; 347 struct ieee80211_rateset allrates; 348 349 /* 350 * Do late attach work that must wait for any subclass 351 * (i.e. driver) work such as overriding methods. 352 */ 353 ieee80211_node_lateattach(ic); 354 355 #ifdef IEEE80211_NO_HOSTAP 356 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 357 #endif /* IEEE80211_NO_HOSTAP */ 358 359 /* 360 * Fill in media characteristics. 361 */ 362 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 363 maxrate = 0; 364 memset(&allrates, 0, sizeof(allrates)); 365 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 366 static const u_int mopts[] = { 367 IFM_AUTO, 368 IFM_IEEE80211_11A, 369 IFM_IEEE80211_11B, 370 IFM_IEEE80211_11G, 371 IFM_IEEE80211_FH, 372 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 373 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 374 }; 375 if ((ic->ic_modecaps & (1<<mode)) == 0) 376 continue; 377 mopt = mopts[mode]; 378 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 379 if (ic->ic_caps & IEEE80211_C_IBSS) 380 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 381 if (ic->ic_caps & IEEE80211_C_HOSTAP) 382 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 383 if (ic->ic_caps & IEEE80211_C_AHDEMO) 384 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 385 if (ic->ic_caps & IEEE80211_C_MONITOR) 386 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 387 if (mode == IEEE80211_MODE_AUTO) 388 continue; 389 rs = &ic->ic_sup_rates[mode]; 390 for (i = 0; i < rs->rs_nrates; i++) { 391 rate = rs->rs_rates[i]; 392 mword = ieee80211_rate2media(ic, rate, mode); 393 if (mword == 0) 394 continue; 395 ADD(ic, mword, mopt); 396 if (ic->ic_caps & IEEE80211_C_IBSS) 397 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 398 if (ic->ic_caps & IEEE80211_C_HOSTAP) 399 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 400 if (ic->ic_caps & IEEE80211_C_AHDEMO) 401 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 402 if (ic->ic_caps & IEEE80211_C_MONITOR) 403 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 404 /* 405 * Add rate to the collection of all rates. 406 */ 407 r = rate & IEEE80211_RATE_VAL; 408 for (j = 0; j < allrates.rs_nrates; j++) 409 if (allrates.rs_rates[j] == r) 410 break; 411 if (j == allrates.rs_nrates) { 412 /* unique, add to the set */ 413 allrates.rs_rates[j] = r; 414 allrates.rs_nrates++; 415 } 416 rate = (rate & IEEE80211_RATE_VAL) / 2; 417 if (rate > maxrate) 418 maxrate = rate; 419 } 420 } 421 for (i = 0; i < allrates.rs_nrates; i++) { 422 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 423 IEEE80211_MODE_AUTO); 424 if (mword == 0) 425 continue; 426 mword = IFM_SUBTYPE(mword); /* remove media options */ 427 ADD(ic, mword, 0); 428 if (ic->ic_caps & IEEE80211_C_IBSS) 429 ADD(ic, mword, IFM_IEEE80211_ADHOC); 430 if (ic->ic_caps & IEEE80211_C_HOSTAP) 431 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 432 if (ic->ic_caps & IEEE80211_C_AHDEMO) 433 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 434 if (ic->ic_caps & IEEE80211_C_MONITOR) 435 ADD(ic, mword, IFM_IEEE80211_MONITOR); 436 } 437 ieee80211_media_status(ifp, &imr); 438 ifmedia_set(&ic->ic_media, imr.ifm_active); 439 440 if (maxrate) 441 ifp->if_baudrate = IF_Mbps(maxrate); 442 #undef ADD 443 } 444 445 void 446 ieee80211_announce(struct ieee80211com *ic) 447 { 448 struct ifnet *ifp = ic->ic_ifp; 449 int i, mode, rate, mword; 450 struct ieee80211_rateset *rs; 451 452 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 453 if ((ic->ic_modecaps & (1<<mode)) == 0) 454 continue; 455 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 456 rs = &ic->ic_sup_rates[mode]; 457 for (i = 0; i < rs->rs_nrates; i++) { 458 rate = rs->rs_rates[i]; 459 mword = ieee80211_rate2media(ic, rate, mode); 460 if (mword == 0) 461 continue; 462 printf("%s%d%sMbps", (i != 0 ? " " : ""), 463 (rate & IEEE80211_RATE_VAL) / 2, 464 ((rate & 0x1) != 0 ? ".5" : "")); 465 } 466 printf("\n"); 467 } 468 } 469 470 static int 471 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 472 { 473 #define IEEERATE(_ic,_m,_i) \ 474 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 475 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 476 for (i = 0; i < nrates; i++) 477 if (IEEERATE(ic, mode, i) == rate) 478 return i; 479 return -1; 480 #undef IEEERATE 481 } 482 483 /* 484 * Find an instance by it's mac address. 485 */ 486 struct ieee80211com * 487 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 488 { 489 int s; 490 struct ieee80211com *ic; 491 492 s = splnet(); 493 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 494 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 495 break; 496 splx(s); 497 return ic; 498 } 499 500 static struct ieee80211com * 501 ieee80211_find_instance(struct ifnet *ifp) 502 { 503 int s; 504 struct ieee80211com *ic; 505 506 s = splnet(); 507 /* XXX not right for multiple instances but works for now */ 508 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 509 if (ic->ic_ifp == ifp) 510 break; 511 splx(s); 512 return ic; 513 } 514 515 /* 516 * Handle a media change request. 517 */ 518 int 519 ieee80211_media_change(struct ifnet *ifp) 520 { 521 struct ieee80211com *ic; 522 struct ifmedia_entry *ime; 523 enum ieee80211_opmode newopmode; 524 enum ieee80211_phymode newphymode; 525 int i, j, newrate, error = 0; 526 527 ic = ieee80211_find_instance(ifp); 528 if (!ic) { 529 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 530 return EINVAL; 531 } 532 ime = ic->ic_media.ifm_cur; 533 /* 534 * First, identify the phy mode. 535 */ 536 switch (IFM_MODE(ime->ifm_media)) { 537 case IFM_IEEE80211_11A: 538 newphymode = IEEE80211_MODE_11A; 539 break; 540 case IFM_IEEE80211_11B: 541 newphymode = IEEE80211_MODE_11B; 542 break; 543 case IFM_IEEE80211_11G: 544 newphymode = IEEE80211_MODE_11G; 545 break; 546 case IFM_IEEE80211_FH: 547 newphymode = IEEE80211_MODE_FH; 548 break; 549 case IFM_AUTO: 550 newphymode = IEEE80211_MODE_AUTO; 551 break; 552 default: 553 return EINVAL; 554 } 555 /* 556 * Turbo mode is an ``option''. 557 * XXX does not apply to AUTO 558 */ 559 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 560 if (newphymode == IEEE80211_MODE_11A) 561 newphymode = IEEE80211_MODE_TURBO_A; 562 else if (newphymode == IEEE80211_MODE_11G) 563 newphymode = IEEE80211_MODE_TURBO_G; 564 else 565 return EINVAL; 566 } 567 /* 568 * Validate requested mode is available. 569 */ 570 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 571 return EINVAL; 572 573 /* 574 * Next, the fixed/variable rate. 575 */ 576 i = -1; 577 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 578 /* 579 * Convert media subtype to rate. 580 */ 581 newrate = ieee80211_media2rate(ime->ifm_media); 582 if (newrate == 0) 583 return EINVAL; 584 /* 585 * Check the rate table for the specified/current phy. 586 */ 587 if (newphymode == IEEE80211_MODE_AUTO) { 588 /* 589 * In autoselect mode search for the rate. 590 */ 591 for (j = IEEE80211_MODE_11A; 592 j < IEEE80211_MODE_MAX; j++) { 593 if ((ic->ic_modecaps & (1<<j)) == 0) 594 continue; 595 i = findrate(ic, j, newrate); 596 if (i != -1) { 597 /* lock mode too */ 598 newphymode = j; 599 break; 600 } 601 } 602 } else { 603 i = findrate(ic, newphymode, newrate); 604 } 605 if (i == -1) /* mode/rate mismatch */ 606 return EINVAL; 607 } 608 /* NB: defer rate setting to later */ 609 610 /* 611 * Deduce new operating mode but don't install it just yet. 612 */ 613 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 614 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 615 newopmode = IEEE80211_M_AHDEMO; 616 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 617 newopmode = IEEE80211_M_HOSTAP; 618 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 619 newopmode = IEEE80211_M_IBSS; 620 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 621 newopmode = IEEE80211_M_MONITOR; 622 else 623 newopmode = IEEE80211_M_STA; 624 625 #ifndef IEEE80211_NO_HOSTAP 626 /* 627 * Autoselect doesn't make sense when operating as an AP. 628 * If no phy mode has been selected, pick one and lock it 629 * down so rate tables can be used in forming beacon frames 630 * and the like. 631 */ 632 if (newopmode == IEEE80211_M_HOSTAP && 633 newphymode == IEEE80211_MODE_AUTO) { 634 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 635 if (ic->ic_modecaps & (1<<j)) { 636 newphymode = j; 637 break; 638 } 639 } 640 #endif /* !IEEE80211_NO_HOSTAP */ 641 642 /* 643 * Handle phy mode change. 644 */ 645 if (ic->ic_curmode != newphymode) { /* change phy mode */ 646 error = ieee80211_setmode(ic, newphymode); 647 if (error != 0) 648 return error; 649 error = ENETRESET; 650 } 651 652 /* 653 * Committed to changes, install the rate setting. 654 */ 655 if (ic->ic_fixed_rate != i) { 656 ic->ic_fixed_rate = i; /* set fixed tx rate */ 657 error = ENETRESET; 658 } 659 660 /* 661 * Handle operating mode change. 662 */ 663 if (ic->ic_opmode != newopmode) { 664 ic->ic_opmode = newopmode; 665 switch (newopmode) { 666 case IEEE80211_M_AHDEMO: 667 case IEEE80211_M_HOSTAP: 668 case IEEE80211_M_STA: 669 case IEEE80211_M_MONITOR: 670 ic->ic_flags &= ~IEEE80211_F_IBSSON; 671 break; 672 case IEEE80211_M_IBSS: 673 ic->ic_flags |= IEEE80211_F_IBSSON; 674 break; 675 } 676 /* 677 * Yech, slot time may change depending on the 678 * operating mode so reset it to be sure everything 679 * is setup appropriately. 680 */ 681 ieee80211_reset_erp(ic); 682 ieee80211_wme_initparams(ic); /* after opmode change */ 683 error = ENETRESET; 684 } 685 #ifdef notdef 686 if (error == 0) 687 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 688 #endif 689 return error; 690 } 691 692 void 693 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 694 { 695 struct ieee80211com *ic; 696 struct ieee80211_rateset *rs; 697 698 ic = ieee80211_find_instance(ifp); 699 if (!ic) { 700 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 701 return; 702 } 703 imr->ifm_status = IFM_AVALID; 704 imr->ifm_active = IFM_IEEE80211; 705 if (ic->ic_state == IEEE80211_S_RUN) 706 imr->ifm_status |= IFM_ACTIVE; 707 /* 708 * Calculate a current rate if possible. 709 */ 710 if (ic->ic_fixed_rate != -1) { 711 /* 712 * A fixed rate is set, report that. 713 */ 714 rs = &ic->ic_sup_rates[ic->ic_curmode]; 715 imr->ifm_active |= ieee80211_rate2media(ic, 716 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 717 } else if (ic->ic_opmode == IEEE80211_M_STA) { 718 /* 719 * In station mode report the current transmit rate. 720 */ 721 rs = &ic->ic_bss->ni_rates; 722 imr->ifm_active |= ieee80211_rate2media(ic, 723 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 724 } else 725 imr->ifm_active |= IFM_AUTO; 726 switch (ic->ic_opmode) { 727 case IEEE80211_M_STA: 728 break; 729 case IEEE80211_M_IBSS: 730 imr->ifm_active |= IFM_IEEE80211_ADHOC; 731 break; 732 case IEEE80211_M_AHDEMO: 733 /* should not come here */ 734 break; 735 case IEEE80211_M_HOSTAP: 736 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 737 break; 738 case IEEE80211_M_MONITOR: 739 imr->ifm_active |= IFM_IEEE80211_MONITOR; 740 break; 741 } 742 switch (ic->ic_curmode) { 743 case IEEE80211_MODE_11A: 744 imr->ifm_active |= IFM_IEEE80211_11A; 745 break; 746 case IEEE80211_MODE_11B: 747 imr->ifm_active |= IFM_IEEE80211_11B; 748 break; 749 case IEEE80211_MODE_11G: 750 imr->ifm_active |= IFM_IEEE80211_11G; 751 break; 752 case IEEE80211_MODE_FH: 753 imr->ifm_active |= IFM_IEEE80211_FH; 754 break; 755 case IEEE80211_MODE_TURBO_A: 756 imr->ifm_active |= IFM_IEEE80211_11A 757 | IFM_IEEE80211_TURBO; 758 break; 759 case IEEE80211_MODE_TURBO_G: 760 imr->ifm_active |= IFM_IEEE80211_11G 761 | IFM_IEEE80211_TURBO; 762 break; 763 } 764 } 765 766 void 767 ieee80211_watchdog(struct ieee80211com *ic) 768 { 769 struct ieee80211_node_table *nt; 770 int need_inact_timer = 0; 771 772 if (ic->ic_state != IEEE80211_S_INIT) { 773 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 774 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 775 nt = &ic->ic_scan; 776 if (nt->nt_inact_timer) { 777 if (--nt->nt_inact_timer == 0) 778 nt->nt_timeout(nt); 779 need_inact_timer += nt->nt_inact_timer; 780 } 781 nt = &ic->ic_sta; 782 if (nt->nt_inact_timer) { 783 if (--nt->nt_inact_timer == 0) 784 nt->nt_timeout(nt); 785 need_inact_timer += nt->nt_inact_timer; 786 } 787 } 788 if (ic->ic_mgt_timer != 0 || need_inact_timer) 789 ic->ic_ifp->if_timer = 1; 790 } 791 792 /* 793 * Set the current phy mode and recalculate the active channel 794 * set based on the available channels for this mode. Also 795 * select a new default/current channel if the current one is 796 * inappropriate for this mode. 797 */ 798 int 799 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 800 { 801 #define N(a) (sizeof(a) / sizeof(a[0])) 802 static const u_int chanflags[] = { 803 0, /* IEEE80211_MODE_AUTO */ 804 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 805 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 806 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 807 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 808 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 809 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 810 }; 811 struct ieee80211_channel *c; 812 u_int modeflags; 813 int i; 814 815 /* validate new mode */ 816 if ((ic->ic_modecaps & (1<<mode)) == 0) { 817 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 818 "%s: mode %u not supported (caps 0x%x)\n", 819 __func__, mode, ic->ic_modecaps); 820 return EINVAL; 821 } 822 823 /* 824 * Verify at least one channel is present in the available 825 * channel list before committing to the new mode. 826 */ 827 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 828 modeflags = chanflags[mode]; 829 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 830 c = &ic->ic_channels[i]; 831 if (mode == IEEE80211_MODE_AUTO) { 832 /* ignore turbo channels for autoselect */ 833 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 834 break; 835 } else { 836 if ((c->ic_flags & modeflags) == modeflags) 837 break; 838 } 839 } 840 if (i > IEEE80211_CHAN_MAX) { 841 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 842 "%s: no channels found for mode %u\n", __func__, mode); 843 return EINVAL; 844 } 845 846 /* 847 * Calculate the active channel set. 848 */ 849 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 850 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 851 c = &ic->ic_channels[i]; 852 if (mode == IEEE80211_MODE_AUTO) { 853 /* take anything but pure turbo channels */ 854 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 855 setbit(ic->ic_chan_active, i); 856 } else { 857 if ((c->ic_flags & modeflags) == modeflags) 858 setbit(ic->ic_chan_active, i); 859 } 860 } 861 /* 862 * If no current/default channel is setup or the current 863 * channel is wrong for the mode then pick the first 864 * available channel from the active list. This is likely 865 * not the right one. 866 */ 867 if (ic->ic_ibss_chan == NULL || 868 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 869 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 870 if (isset(ic->ic_chan_active, i)) { 871 ic->ic_ibss_chan = &ic->ic_channels[i]; 872 break; 873 } 874 IASSERT(ic->ic_ibss_chan != NULL && 875 isset(ic->ic_chan_active, 876 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 877 ("Bad IBSS channel %u", 878 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 879 } 880 /* 881 * If the desired channel is set but no longer valid then reset it. 882 */ 883 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 884 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 885 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 886 887 /* 888 * Do mode-specific rate setup. 889 */ 890 if (mode == IEEE80211_MODE_11G) { 891 /* 892 * Use a mixed 11b/11g rate set. 893 */ 894 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 895 IEEE80211_MODE_11G); 896 } else if (mode == IEEE80211_MODE_11B) { 897 /* 898 * Force pure 11b rate set. 899 */ 900 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 901 IEEE80211_MODE_11B); 902 } 903 /* 904 * Setup an initial rate set according to the 905 * current/default channel selected above. This 906 * will be changed when scanning but must exist 907 * now so driver have a consistent state of ic_ibss_chan. 908 */ 909 if (ic->ic_bss) /* NB: can be called before lateattach */ 910 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 911 912 ic->ic_curmode = mode; 913 ieee80211_reset_erp(ic); /* reset ERP state */ 914 ieee80211_wme_initparams(ic); /* reset WME stat */ 915 916 return 0; 917 #undef N 918 } 919 920 /* 921 * Return the phy mode for with the specified channel so the 922 * caller can select a rate set. This is problematic for channels 923 * where multiple operating modes are possible (e.g. 11g+11b). 924 * In those cases we defer to the current operating mode when set. 925 */ 926 enum ieee80211_phymode 927 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 928 { 929 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 930 /* 931 * This assumes all 11a turbo channels are also 932 * usable withut turbo, which is currently true. 933 */ 934 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A) 935 return IEEE80211_MODE_TURBO_A; 936 return IEEE80211_MODE_11A; 937 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 938 return IEEE80211_MODE_FH; 939 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 940 /* 941 * This assumes all 11g channels are also usable 942 * for 11b, which is currently true. 943 */ 944 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 945 return IEEE80211_MODE_TURBO_G; 946 if (ic->ic_curmode == IEEE80211_MODE_11B) 947 return IEEE80211_MODE_11B; 948 return IEEE80211_MODE_11G; 949 } else 950 return IEEE80211_MODE_11B; 951 } 952 953 /* 954 * convert IEEE80211 rate value to ifmedia subtype. 955 * ieee80211 rate is in unit of 0.5Mbps. 956 */ 957 int 958 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 959 { 960 #define N(a) (sizeof(a) / sizeof(a[0])) 961 static const struct { 962 u_int m; /* rate + mode */ 963 u_int r; /* if_media rate */ 964 } rates[] = { 965 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 966 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 967 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 968 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 969 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 970 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 971 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 972 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 973 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 974 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 975 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 976 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 977 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 978 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 979 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 980 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 981 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 982 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 983 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 984 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 985 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 986 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 987 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 988 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 989 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 990 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 991 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 992 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 993 }; 994 u_int mask, i; 995 996 mask = rate & IEEE80211_RATE_VAL; 997 switch (mode) { 998 case IEEE80211_MODE_11A: 999 case IEEE80211_MODE_TURBO_A: 1000 mask |= IFM_IEEE80211_11A; 1001 break; 1002 case IEEE80211_MODE_11B: 1003 mask |= IFM_IEEE80211_11B; 1004 break; 1005 case IEEE80211_MODE_FH: 1006 mask |= IFM_IEEE80211_FH; 1007 break; 1008 case IEEE80211_MODE_AUTO: 1009 /* NB: ic may be NULL for some drivers */ 1010 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1011 mask |= IFM_IEEE80211_FH; 1012 break; 1013 } 1014 /* NB: hack, 11g matches both 11b+11a rates */ 1015 /* fall thru... */ 1016 case IEEE80211_MODE_11G: 1017 case IEEE80211_MODE_TURBO_G: 1018 mask |= IFM_IEEE80211_11G; 1019 break; 1020 } 1021 for (i = 0; i < N(rates); i++) 1022 if (rates[i].m == mask) 1023 return rates[i].r; 1024 return IFM_AUTO; 1025 #undef N 1026 } 1027 1028 int 1029 ieee80211_media2rate(int mword) 1030 { 1031 #define N(a) (sizeof(a) / sizeof(a[0])) 1032 static const int ieeerates[] = { 1033 -1, /* IFM_AUTO */ 1034 0, /* IFM_MANUAL */ 1035 0, /* IFM_NONE */ 1036 2, /* IFM_IEEE80211_FH1 */ 1037 4, /* IFM_IEEE80211_FH2 */ 1038 2, /* IFM_IEEE80211_DS1 */ 1039 4, /* IFM_IEEE80211_DS2 */ 1040 11, /* IFM_IEEE80211_DS5 */ 1041 22, /* IFM_IEEE80211_DS11 */ 1042 44, /* IFM_IEEE80211_DS22 */ 1043 12, /* IFM_IEEE80211_OFDM6 */ 1044 18, /* IFM_IEEE80211_OFDM9 */ 1045 24, /* IFM_IEEE80211_OFDM12 */ 1046 36, /* IFM_IEEE80211_OFDM18 */ 1047 48, /* IFM_IEEE80211_OFDM24 */ 1048 72, /* IFM_IEEE80211_OFDM36 */ 1049 96, /* IFM_IEEE80211_OFDM48 */ 1050 108, /* IFM_IEEE80211_OFDM54 */ 1051 144, /* IFM_IEEE80211_OFDM72 */ 1052 }; 1053 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1054 ieeerates[IFM_SUBTYPE(mword)] : 0; 1055 #undef N 1056 } 1057
Indexes created Thu Oct 02 10:09:58 GMT 2025