ieee80211.c revision 1.48.14.1
1 /* $NetBSD: ieee80211.c,v 1.48.14.1 2009/01/17 13:29:32 mjf 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 1.48.14.1 2009/01/17 13:29:32 mjf 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 ieee80211_setbasicrates(struct ieee80211com *); 97 98 static void 99 ieee80211_add_vap(struct ieee80211com *ic) 100 { 101 #define N(a) (sizeof(a)/sizeof(a[0])) 102 int i; 103 int s; 104 u_int8_t b; 105 106 s = splnet(); 107 ic->ic_vap = 0; 108 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 109 ic->ic_vap += NBBY; 110 if (i == N(ieee80211_vapmap)) 111 panic("vap table full"); 112 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 113 ic->ic_vap++; 114 setbit(ieee80211_vapmap, ic->ic_vap); 115 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 116 splx(s); 117 #undef N 118 } 119 120 static void 121 ieee80211_remove_vap(struct ieee80211com *ic) 122 { 123 int s; 124 125 s = splnet(); 126 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 127 IASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 128 ("invalid vap id %d", ic->ic_vap)); 129 IASSERT(isset(ieee80211_vapmap, ic->ic_vap), 130 ("vap id %d not allocated", ic->ic_vap)); 131 clrbit(ieee80211_vapmap, ic->ic_vap); 132 splx(s); 133 } 134 135 /* 136 * Default reset method for use with the ioctl support. This 137 * method is invoked after any state change in the 802.11 138 * layer that should be propagated to the hardware but not 139 * require re-initialization of the 802.11 state machine (e.g 140 * rescanning for an ap). We always return ENETRESET which 141 * should cause the driver to re-initialize the device. Drivers 142 * can override this method to implement more optimized support. 143 */ 144 static int 145 ieee80211_default_reset(struct ifnet *ifp) 146 { 147 return ENETRESET; 148 } 149 150 void 151 ieee80211_ifattach(struct ieee80211com *ic) 152 { 153 struct ifnet *ifp = ic->ic_ifp; 154 struct ieee80211_channel *c; 155 int i; 156 157 #ifdef __NetBSD__ 158 ieee80211_init(); 159 #endif /* __NetBSD__ */ 160 161 ether_ifattach(ifp, ic->ic_myaddr); 162 #if NBPFILTER > 0 163 bpfattach2(ifp, DLT_IEEE802_11, 164 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 165 #endif 166 167 ieee80211_crypto_attach(ic); 168 169 /* 170 * Fill in 802.11 available channel set, mark 171 * all available channels as active, and pick 172 * a default channel if not already specified. 173 */ 174 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 175 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 176 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 177 c = &ic->ic_channels[i]; 178 if (c->ic_flags) { 179 /* 180 * Verify driver passed us valid data. 181 */ 182 if (i != ieee80211_chan2ieee(ic, c)) { 183 if_printf(ifp, "bad channel ignored; " 184 "freq %u flags %x number %u\n", 185 c->ic_freq, c->ic_flags, i); 186 c->ic_flags = 0; /* NB: remove */ 187 continue; 188 } 189 setbit(ic->ic_chan_avail, i); 190 /* 191 * Identify mode capabilities. 192 */ 193 if (IEEE80211_IS_CHAN_A(c)) 194 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 195 if (IEEE80211_IS_CHAN_B(c)) 196 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 197 if (IEEE80211_IS_CHAN_PUREG(c)) 198 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 199 if (IEEE80211_IS_CHAN_FHSS(c)) 200 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 201 if (IEEE80211_IS_CHAN_T(c)) 202 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 203 if (IEEE80211_IS_CHAN_108G(c)) 204 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 205 if (ic->ic_curchan == NULL) { 206 /* arbitrarily pick the first channel */ 207 ic->ic_curchan = &ic->ic_channels[i]; 208 } 209 } 210 } 211 /* validate ic->ic_curmode */ 212 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 213 ic->ic_curmode = IEEE80211_MODE_AUTO; 214 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 215 #if 0 216 /* 217 * Enable WME by default if we're capable. 218 */ 219 if (ic->ic_caps & IEEE80211_C_WME) 220 ic->ic_flags |= IEEE80211_F_WME; 221 #endif 222 ieee80211_setbasicrates(ic); 223 (void) ieee80211_setmode(ic, ic->ic_curmode); 224 225 if (ic->ic_bintval == 0) 226 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 227 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 228 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 229 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 230 231 if (ic->ic_lintval == 0) 232 ic->ic_lintval = ic->ic_bintval; 233 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 234 235 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 236 ieee80211_node_attach(ic); 237 ieee80211_proto_attach(ic); 238 239 ieee80211_add_vap(ic); 240 241 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 242 243 /* 244 * Install a default reset method for the ioctl support. 245 * The driver is expected to fill this in before calling us. 246 */ 247 if (ic->ic_reset == NULL) 248 ic->ic_reset = ieee80211_default_reset; 249 } 250 251 void 252 ieee80211_ifdetach(struct ieee80211com *ic) 253 { 254 struct ifnet *ifp = ic->ic_ifp; 255 256 ieee80211_remove_vap(ic); 257 258 ieee80211_sysctl_detach(ic); 259 ieee80211_proto_detach(ic); 260 ieee80211_crypto_detach(ic); 261 ieee80211_node_detach(ic); 262 LIST_REMOVE(ic, ic_list); 263 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 264 265 IEEE80211_BEACON_LOCK_DESTROY(ic); 266 267 #if NBPFILTER > 0 268 bpfdetach(ifp); 269 #endif 270 ether_ifdetach(ifp); 271 } 272 273 /* 274 * Convert MHz frequency to IEEE channel number. 275 */ 276 u_int 277 ieee80211_mhz2ieee(u_int freq, u_int flags) 278 { 279 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 280 if (freq == 2484) 281 return 14; 282 if (freq < 2484) 283 return (freq - 2407) / 5; 284 else 285 return 15 + ((freq - 2512) / 20); 286 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5 GHz band */ 287 return (freq - 5000) / 5; 288 } else { /* either, guess */ 289 if (freq == 2484) 290 return 14; 291 if (freq < 2484) 292 return (freq - 2407) / 5; 293 if (freq < 5000) 294 return 15 + ((freq - 2512) / 20); 295 return (freq - 5000) / 5; 296 } 297 } 298 299 /* 300 * Convert channel to IEEE channel number. 301 */ 302 u_int 303 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 304 { 305 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 306 return c - ic->ic_channels; 307 else if (c == IEEE80211_CHAN_ANYC) 308 return IEEE80211_CHAN_ANY; 309 else if (c != NULL) { 310 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 311 c->ic_freq, c->ic_flags); 312 return 0; /* XXX */ 313 } else { 314 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 315 return 0; /* XXX */ 316 } 317 } 318 319 /* 320 * Convert IEEE channel number to MHz frequency. 321 */ 322 u_int 323 ieee80211_ieee2mhz(u_int chan, u_int flags) 324 { 325 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 326 if (chan == 14) 327 return 2484; 328 if (chan < 14) 329 return 2407 + chan*5; 330 else 331 return 2512 + ((chan-15)*20); 332 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5 GHz band */ 333 return 5000 + (chan*5); 334 } else { /* either, guess */ 335 if (chan == 14) 336 return 2484; 337 if (chan < 14) /* 0-13 */ 338 return 2407 + chan*5; 339 if (chan < 27) /* 15-26 */ 340 return 2512 + ((chan-15)*20); 341 return 5000 + (chan*5); 342 } 343 } 344 345 /* 346 * Setup the media data structures according to the channel and 347 * rate tables. This must be called by the driver after 348 * ieee80211_attach and before most anything else. 349 */ 350 void 351 ieee80211_media_init(struct ieee80211com *ic, 352 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 353 { 354 #define ADD(_ic, _s, _o) \ 355 ifmedia_add(&(_ic)->ic_media, \ 356 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 357 struct ifnet *ifp = ic->ic_ifp; 358 struct ifmediareq imr; 359 int i, j, mode, rate, maxrate, mword, mopt, r; 360 struct ieee80211_rateset *rs; 361 struct ieee80211_rateset allrates; 362 363 /* 364 * Do late attach work that must wait for any subclass 365 * (i.e. driver) work such as overriding methods. 366 */ 367 ieee80211_node_lateattach(ic); 368 369 #ifdef IEEE80211_NO_HOSTAP 370 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 371 #endif /* IEEE80211_NO_HOSTAP */ 372 373 /* 374 * Fill in media characteristics. 375 */ 376 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 377 maxrate = 0; 378 memset(&allrates, 0, sizeof(allrates)); 379 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 380 static const u_int mopts[] = { 381 IFM_AUTO, 382 IFM_IEEE80211_11A, 383 IFM_IEEE80211_11B, 384 IFM_IEEE80211_11G, 385 IFM_IEEE80211_FH, 386 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 387 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 388 }; 389 if ((ic->ic_modecaps & (1<<mode)) == 0) 390 continue; 391 mopt = mopts[mode]; 392 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 393 if (ic->ic_caps & IEEE80211_C_IBSS) 394 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 395 if (ic->ic_caps & IEEE80211_C_HOSTAP) 396 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 397 if (ic->ic_caps & IEEE80211_C_AHDEMO) 398 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 399 if (ic->ic_caps & IEEE80211_C_MONITOR) 400 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 401 if (mode == IEEE80211_MODE_AUTO) 402 continue; 403 rs = &ic->ic_sup_rates[mode]; 404 for (i = 0; i < rs->rs_nrates; i++) { 405 rate = rs->rs_rates[i]; 406 mword = ieee80211_rate2media(ic, rate, mode); 407 if (mword == 0) 408 continue; 409 ADD(ic, mword, mopt); 410 if (ic->ic_caps & IEEE80211_C_IBSS) 411 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 412 if (ic->ic_caps & IEEE80211_C_HOSTAP) 413 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 414 if (ic->ic_caps & IEEE80211_C_AHDEMO) 415 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 416 if (ic->ic_caps & IEEE80211_C_MONITOR) 417 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 418 /* 419 * Add rate to the collection of all rates. 420 */ 421 r = rate & IEEE80211_RATE_VAL; 422 for (j = 0; j < allrates.rs_nrates; j++) 423 if (allrates.rs_rates[j] == r) 424 break; 425 if (j == allrates.rs_nrates) { 426 /* unique, add to the set */ 427 allrates.rs_rates[j] = r; 428 allrates.rs_nrates++; 429 } 430 rate = (rate & IEEE80211_RATE_VAL) / 2; 431 if (rate > maxrate) 432 maxrate = rate; 433 } 434 } 435 for (i = 0; i < allrates.rs_nrates; i++) { 436 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 437 IEEE80211_MODE_AUTO); 438 if (mword == 0) 439 continue; 440 mword = IFM_SUBTYPE(mword); /* remove media options */ 441 ADD(ic, mword, 0); 442 if (ic->ic_caps & IEEE80211_C_IBSS) 443 ADD(ic, mword, IFM_IEEE80211_ADHOC); 444 if (ic->ic_caps & IEEE80211_C_HOSTAP) 445 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 446 if (ic->ic_caps & IEEE80211_C_AHDEMO) 447 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 448 if (ic->ic_caps & IEEE80211_C_MONITOR) 449 ADD(ic, mword, IFM_IEEE80211_MONITOR); 450 } 451 ieee80211_media_status(ifp, &imr); 452 ifmedia_set(&ic->ic_media, imr.ifm_active); 453 454 if (maxrate) 455 ifp->if_baudrate = IF_Mbps(maxrate); 456 #undef ADD 457 } 458 459 void 460 ieee80211_announce(struct ieee80211com *ic) 461 { 462 struct ifnet *ifp = ic->ic_ifp; 463 int i, mode, rate, mword; 464 struct ieee80211_rateset *rs; 465 466 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 467 if ((ic->ic_modecaps & (1<<mode)) == 0) 468 continue; 469 aprint_normal("%s: %s rates: ", ifp->if_xname, 470 ieee80211_phymode_name[mode]); 471 rs = &ic->ic_sup_rates[mode]; 472 for (i = 0; i < rs->rs_nrates; i++) { 473 rate = rs->rs_rates[i]; 474 mword = ieee80211_rate2media(ic, rate, mode); 475 if (mword == 0) 476 continue; 477 aprint_normal("%s%d%sMbps", (i != 0 ? " " : ""), 478 (rate & IEEE80211_RATE_VAL) / 2, 479 ((rate & 0x1) != 0 ? ".5" : "")); 480 } 481 aprint_normal("\n"); 482 } 483 } 484 485 static int 486 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 487 { 488 #define IEEERATE(_ic,_m,_i) \ 489 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 490 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 491 for (i = 0; i < nrates; i++) 492 if (IEEERATE(ic, mode, i) == rate) 493 return i; 494 return -1; 495 #undef IEEERATE 496 } 497 498 /* 499 * Find an instance by it's mac address. 500 */ 501 struct ieee80211com * 502 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 503 { 504 int s; 505 struct ieee80211com *ic; 506 507 s = splnet(); 508 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 509 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 510 break; 511 splx(s); 512 return ic; 513 } 514 515 static struct ieee80211com * 516 ieee80211_find_instance(struct ifnet *ifp) 517 { 518 int s; 519 struct ieee80211com *ic; 520 521 s = splnet(); 522 /* XXX not right for multiple instances but works for now */ 523 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 524 if (ic->ic_ifp == ifp) 525 break; 526 splx(s); 527 return ic; 528 } 529 530 /* 531 * Handle a media change request. 532 */ 533 int 534 ieee80211_media_change(struct ifnet *ifp) 535 { 536 struct ieee80211com *ic; 537 struct ifmedia_entry *ime; 538 enum ieee80211_opmode newopmode; 539 enum ieee80211_phymode newphymode; 540 int i, j, newrate, error = 0; 541 542 ic = ieee80211_find_instance(ifp); 543 if (!ic) { 544 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 545 return EINVAL; 546 } 547 ime = ic->ic_media.ifm_cur; 548 /* 549 * First, identify the phy mode. 550 */ 551 switch (IFM_MODE(ime->ifm_media)) { 552 case IFM_IEEE80211_11A: 553 newphymode = IEEE80211_MODE_11A; 554 break; 555 case IFM_IEEE80211_11B: 556 newphymode = IEEE80211_MODE_11B; 557 break; 558 case IFM_IEEE80211_11G: 559 newphymode = IEEE80211_MODE_11G; 560 break; 561 case IFM_IEEE80211_FH: 562 newphymode = IEEE80211_MODE_FH; 563 break; 564 case IFM_AUTO: 565 newphymode = IEEE80211_MODE_AUTO; 566 break; 567 default: 568 return EINVAL; 569 } 570 /* 571 * Turbo mode is an ``option''. 572 * XXX does not apply to AUTO 573 */ 574 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 575 if (newphymode == IEEE80211_MODE_11A) 576 newphymode = IEEE80211_MODE_TURBO_A; 577 else if (newphymode == IEEE80211_MODE_11G) 578 newphymode = IEEE80211_MODE_TURBO_G; 579 else 580 return EINVAL; 581 } 582 /* 583 * Validate requested mode is available. 584 */ 585 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 586 return EINVAL; 587 588 /* 589 * Next, the fixed/variable rate. 590 */ 591 i = -1; 592 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 593 /* 594 * Convert media subtype to rate. 595 */ 596 newrate = ieee80211_media2rate(ime->ifm_media); 597 if (newrate == 0) 598 return EINVAL; 599 /* 600 * Check the rate table for the specified/current phy. 601 */ 602 if (newphymode == IEEE80211_MODE_AUTO) { 603 /* 604 * In autoselect mode search for the rate. 605 */ 606 for (j = IEEE80211_MODE_11A; 607 j < IEEE80211_MODE_MAX; j++) { 608 if ((ic->ic_modecaps & (1<<j)) == 0) 609 continue; 610 i = findrate(ic, j, newrate); 611 if (i != -1) { 612 /* lock mode too */ 613 newphymode = j; 614 break; 615 } 616 } 617 } else { 618 i = findrate(ic, newphymode, newrate); 619 } 620 if (i == -1) /* mode/rate mismatch */ 621 return EINVAL; 622 } 623 /* NB: defer rate setting to later */ 624 625 /* 626 * Deduce new operating mode but don't install it just yet. 627 */ 628 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 629 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 630 newopmode = IEEE80211_M_AHDEMO; 631 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 632 newopmode = IEEE80211_M_HOSTAP; 633 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 634 newopmode = IEEE80211_M_IBSS; 635 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 636 newopmode = IEEE80211_M_MONITOR; 637 else 638 newopmode = IEEE80211_M_STA; 639 640 #ifndef IEEE80211_NO_HOSTAP 641 /* 642 * Autoselect doesn't make sense when operating as an AP. 643 * If no phy mode has been selected, pick one and lock it 644 * down so rate tables can be used in forming beacon frames 645 * and the like. 646 */ 647 if (newopmode == IEEE80211_M_HOSTAP && 648 newphymode == IEEE80211_MODE_AUTO) { 649 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 650 if (ic->ic_modecaps & (1<<j)) { 651 newphymode = j; 652 break; 653 } 654 } 655 #endif /* !IEEE80211_NO_HOSTAP */ 656 657 /* 658 * Handle phy mode change. 659 */ 660 if (ic->ic_curmode != newphymode) { /* change phy mode */ 661 error = ieee80211_setmode(ic, newphymode); 662 if (error != 0) 663 return error; 664 error = ENETRESET; 665 } 666 667 /* 668 * Committed to changes, install the rate setting. 669 */ 670 if (ic->ic_fixed_rate != i) { 671 ic->ic_fixed_rate = i; /* set fixed tx rate */ 672 error = ENETRESET; 673 } 674 675 /* 676 * Handle operating mode change. 677 */ 678 if (ic->ic_opmode != newopmode) { 679 ic->ic_opmode = newopmode; 680 switch (newopmode) { 681 case IEEE80211_M_AHDEMO: 682 case IEEE80211_M_HOSTAP: 683 case IEEE80211_M_STA: 684 case IEEE80211_M_MONITOR: 685 ic->ic_flags &= ~IEEE80211_F_IBSSON; 686 break; 687 case IEEE80211_M_IBSS: 688 ic->ic_flags |= IEEE80211_F_IBSSON; 689 break; 690 } 691 /* 692 * Yech, slot time may change depending on the 693 * operating mode so reset it to be sure everything 694 * is setup appropriately. 695 */ 696 ieee80211_reset_erp(ic); 697 ieee80211_wme_initparams(ic); /* after opmode change */ 698 error = ENETRESET; 699 } 700 #ifdef notdef 701 if (error == 0) 702 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 703 #endif 704 return error; 705 } 706 707 void 708 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 709 { 710 struct ieee80211com *ic; 711 struct ieee80211_rateset *rs; 712 713 ic = ieee80211_find_instance(ifp); 714 if (!ic) { 715 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 716 return; 717 } 718 imr->ifm_status = IFM_AVALID; 719 imr->ifm_active = IFM_IEEE80211; 720 if (ic->ic_state == IEEE80211_S_RUN) 721 imr->ifm_status |= IFM_ACTIVE; 722 /* 723 * Calculate a current rate if possible. 724 */ 725 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 726 /* 727 * A fixed rate is set, report that. 728 */ 729 rs = &ic->ic_sup_rates[ic->ic_curmode]; 730 imr->ifm_active |= ieee80211_rate2media(ic, 731 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 732 } else if (ic->ic_opmode == IEEE80211_M_STA) { 733 /* 734 * In station mode report the current transmit rate. 735 */ 736 rs = &ic->ic_bss->ni_rates; 737 imr->ifm_active |= ieee80211_rate2media(ic, 738 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 739 } else 740 imr->ifm_active |= IFM_AUTO; 741 switch (ic->ic_opmode) { 742 case IEEE80211_M_STA: 743 break; 744 case IEEE80211_M_IBSS: 745 imr->ifm_active |= IFM_IEEE80211_ADHOC; 746 break; 747 case IEEE80211_M_AHDEMO: 748 /* should not come here */ 749 break; 750 case IEEE80211_M_HOSTAP: 751 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 752 break; 753 case IEEE80211_M_MONITOR: 754 imr->ifm_active |= IFM_IEEE80211_MONITOR; 755 break; 756 } 757 switch (ic->ic_curmode) { 758 case IEEE80211_MODE_11A: 759 imr->ifm_active |= IFM_IEEE80211_11A; 760 break; 761 case IEEE80211_MODE_11B: 762 imr->ifm_active |= IFM_IEEE80211_11B; 763 break; 764 case IEEE80211_MODE_11G: 765 imr->ifm_active |= IFM_IEEE80211_11G; 766 break; 767 case IEEE80211_MODE_FH: 768 imr->ifm_active |= IFM_IEEE80211_FH; 769 break; 770 case IEEE80211_MODE_TURBO_A: 771 imr->ifm_active |= IFM_IEEE80211_11A 772 | IFM_IEEE80211_TURBO; 773 break; 774 case IEEE80211_MODE_TURBO_G: 775 imr->ifm_active |= IFM_IEEE80211_11G 776 | IFM_IEEE80211_TURBO; 777 break; 778 } 779 } 780 781 void 782 ieee80211_watchdog(struct ieee80211com *ic) 783 { 784 struct ieee80211_node_table *nt; 785 int need_inact_timer = 0; 786 787 if (ic->ic_state != IEEE80211_S_INIT) { 788 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 789 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 790 nt = &ic->ic_scan; 791 if (nt->nt_inact_timer) { 792 if (--nt->nt_inact_timer == 0) 793 nt->nt_timeout(nt); 794 need_inact_timer += nt->nt_inact_timer; 795 } 796 nt = &ic->ic_sta; 797 if (nt->nt_inact_timer) { 798 if (--nt->nt_inact_timer == 0) 799 nt->nt_timeout(nt); 800 need_inact_timer += nt->nt_inact_timer; 801 } 802 } 803 if (ic->ic_mgt_timer != 0 || need_inact_timer) 804 ic->ic_ifp->if_timer = 1; 805 } 806 807 const struct ieee80211_rateset ieee80211_std_rateset_11a = 808 { 8, { 12, 18, 24, 36, 48, 72, 96, 108 } }; 809 810 const struct ieee80211_rateset ieee80211_std_rateset_11b = 811 { 4, { 2, 4, 11, 22 } }; 812 813 const struct ieee80211_rateset ieee80211_std_rateset_11g = 814 { 12, { 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 } }; 815 816 /* 817 * Mark the basic rates for the 11g rate table based on the 818 * operating mode. For real 11g we mark all the 11b rates 819 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 820 * 11b rates. There's also a pseudo 11a-mode used to mark only 821 * the basic OFDM rates. 822 */ 823 static void 824 ieee80211_setbasicrates(struct ieee80211com *ic) 825 { 826 static const struct ieee80211_rateset basic[] = { 827 { 0, { } }, /* IEEE80211_MODE_AUTO */ 828 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 829 { 2, { 2, 4 } }, /* IEEE80211_MODE_11B */ 830 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11G */ 831 { 0, { } }, /* IEEE80211_MODE_TURBO */ 832 }; 833 enum ieee80211_phymode mode; 834 struct ieee80211_rateset *rs; 835 int i, j; 836 837 for (mode = 0; mode < IEEE80211_MODE_MAX; mode++) { 838 rs = &ic->ic_sup_rates[mode]; 839 for (i = 0; i < rs->rs_nrates; i++) { 840 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 841 for (j = 0; j < basic[mode].rs_nrates; j++) { 842 if (basic[mode].rs_rates[j] != rs->rs_rates[i]) 843 continue; 844 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 845 break; 846 } 847 } 848 } 849 } 850 851 /* 852 * Set the current phy mode and recalculate the active channel 853 * set based on the available channels for this mode. Also 854 * select a new default/current channel if the current one is 855 * inappropriate for this mode. 856 */ 857 int 858 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 859 { 860 #define N(a) (sizeof(a) / sizeof(a[0])) 861 static const u_int chanflags[] = { 862 0, /* IEEE80211_MODE_AUTO */ 863 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 864 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 865 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 866 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 867 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 868 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 869 }; 870 struct ieee80211_channel *c; 871 u_int modeflags; 872 int i; 873 874 /* validate new mode */ 875 if ((ic->ic_modecaps & (1<<mode)) == 0) { 876 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 877 "%s: mode %u not supported (caps 0x%x)\n", 878 __func__, mode, ic->ic_modecaps); 879 return EINVAL; 880 } 881 882 /* 883 * Verify at least one channel is present in the available 884 * channel list before committing to the new mode. 885 */ 886 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 887 modeflags = chanflags[mode]; 888 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 889 c = &ic->ic_channels[i]; 890 if (c->ic_flags == 0) 891 continue; 892 if (mode == IEEE80211_MODE_AUTO) { 893 /* ignore turbo channels for autoselect */ 894 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 895 break; 896 } else { 897 if ((c->ic_flags & modeflags) == modeflags) 898 break; 899 } 900 } 901 if (i > IEEE80211_CHAN_MAX) { 902 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 903 "%s: no channels found for mode %u\n", __func__, mode); 904 return EINVAL; 905 } 906 907 /* 908 * Calculate the active channel set. 909 */ 910 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 911 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 912 c = &ic->ic_channels[i]; 913 if (c->ic_flags == 0) 914 continue; 915 if (mode == IEEE80211_MODE_AUTO) { 916 /* take anything but pure turbo channels */ 917 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 918 setbit(ic->ic_chan_active, i); 919 } else { 920 if ((c->ic_flags & modeflags) == modeflags) 921 setbit(ic->ic_chan_active, i); 922 } 923 } 924 /* 925 * If no current/default channel is setup or the current 926 * channel is wrong for the mode then pick the first 927 * available channel from the active list. This is likely 928 * not the right one. 929 */ 930 if (ic->ic_ibss_chan == NULL || 931 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 932 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 933 if (isset(ic->ic_chan_active, i)) { 934 ic->ic_ibss_chan = &ic->ic_channels[i]; 935 break; 936 } 937 IASSERT(ic->ic_ibss_chan != NULL && 938 isset(ic->ic_chan_active, 939 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 940 ("Bad IBSS channel %u", 941 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 942 } 943 /* 944 * If the desired channel is set but no longer valid then reset it. 945 */ 946 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 947 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 948 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 949 950 /* 951 * Do mode-specific rate setup. 952 */ 953 if (mode == IEEE80211_MODE_11G) { 954 /* 955 * Use a mixed 11b/11g rate set. 956 */ 957 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 958 IEEE80211_MODE_11G); 959 } else if (mode == IEEE80211_MODE_11B) { 960 /* 961 * Force pure 11b rate set. 962 */ 963 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 964 IEEE80211_MODE_11B); 965 } 966 /* 967 * Setup an initial rate set according to the 968 * current/default channel selected above. This 969 * will be changed when scanning but must exist 970 * now so driver have a consistent state of ic_ibss_chan. 971 */ 972 if (ic->ic_bss) /* NB: can be called before lateattach */ 973 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 974 975 ic->ic_curmode = mode; 976 ieee80211_reset_erp(ic); /* reset ERP state */ 977 ieee80211_wme_initparams(ic); /* reset WME stat */ 978 979 return 0; 980 #undef N 981 } 982 983 /* 984 * Return the phy mode for with the specified channel so the 985 * caller can select a rate set. This is problematic for channels 986 * where multiple operating modes are possible (e.g. 11g+11b). 987 * In those cases we defer to the current operating mode when set. 988 */ 989 enum ieee80211_phymode 990 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 991 { 992 if (IEEE80211_IS_CHAN_T(chan)) { 993 return IEEE80211_MODE_TURBO_A; 994 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 995 return IEEE80211_MODE_11A; 996 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 997 return IEEE80211_MODE_FH; 998 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 999 /* 1000 * This assumes all 11g channels are also usable 1001 * for 11b, which is currently true. 1002 */ 1003 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1004 return IEEE80211_MODE_TURBO_G; 1005 if (ic->ic_curmode == IEEE80211_MODE_11B) 1006 return IEEE80211_MODE_11B; 1007 return IEEE80211_MODE_11G; 1008 } else 1009 return IEEE80211_MODE_11B; 1010 } 1011 1012 /* 1013 * convert IEEE80211 rate value to ifmedia subtype. 1014 * ieee80211 rate is in unit of 0.5Mbps. 1015 */ 1016 int 1017 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 1018 { 1019 #define N(a) (sizeof(a) / sizeof(a[0])) 1020 static const struct { 1021 u_int m; /* rate + mode */ 1022 u_int r; /* if_media rate */ 1023 } rates[] = { 1024 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 1025 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 1026 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 1027 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 1028 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 1029 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 1030 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 1031 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 1032 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 1033 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 1034 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 1035 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 1036 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 1037 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 1038 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 1039 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 1040 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 1041 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 1042 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 1043 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 1044 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 1045 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 1046 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1047 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1048 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1049 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1050 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1051 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1052 }; 1053 u_int mask, i; 1054 1055 mask = rate & IEEE80211_RATE_VAL; 1056 switch (mode) { 1057 case IEEE80211_MODE_11A: 1058 case IEEE80211_MODE_TURBO_A: 1059 mask |= IFM_IEEE80211_11A; 1060 break; 1061 case IEEE80211_MODE_11B: 1062 mask |= IFM_IEEE80211_11B; 1063 break; 1064 case IEEE80211_MODE_FH: 1065 mask |= IFM_IEEE80211_FH; 1066 break; 1067 case IEEE80211_MODE_AUTO: 1068 /* NB: ic may be NULL for some drivers */ 1069 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1070 mask |= IFM_IEEE80211_FH; 1071 break; 1072 } 1073 /* NB: hack, 11g matches both 11b+11a rates */ 1074 /* fall thru... */ 1075 case IEEE80211_MODE_11G: 1076 case IEEE80211_MODE_TURBO_G: 1077 mask |= IFM_IEEE80211_11G; 1078 break; 1079 } 1080 for (i = 0; i < N(rates); i++) 1081 if (rates[i].m == mask) 1082 return rates[i].r; 1083 return IFM_AUTO; 1084 #undef N 1085 } 1086 1087 int 1088 ieee80211_media2rate(int mword) 1089 { 1090 #define N(a) (sizeof(a) / sizeof(a[0])) 1091 static const int ieeerates[] = { 1092 -1, /* IFM_AUTO */ 1093 0, /* IFM_MANUAL */ 1094 0, /* IFM_NONE */ 1095 2, /* IFM_IEEE80211_FH1 */ 1096 4, /* IFM_IEEE80211_FH2 */ 1097 4, /* IFM_IEEE80211_DS2 */ 1098 11, /* IFM_IEEE80211_DS5 */ 1099 22, /* IFM_IEEE80211_DS11 */ 1100 2, /* IFM_IEEE80211_DS1 */ 1101 44, /* IFM_IEEE80211_DS22 */ 1102 12, /* IFM_IEEE80211_OFDM6 */ 1103 18, /* IFM_IEEE80211_OFDM9 */ 1104 24, /* IFM_IEEE80211_OFDM12 */ 1105 36, /* IFM_IEEE80211_OFDM18 */ 1106 48, /* IFM_IEEE80211_OFDM24 */ 1107 72, /* IFM_IEEE80211_OFDM36 */ 1108 96, /* IFM_IEEE80211_OFDM48 */ 1109 108, /* IFM_IEEE80211_OFDM54 */ 1110 144, /* IFM_IEEE80211_OFDM72 */ 1111 }; 1112 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1113 ieeerates[IFM_SUBTYPE(mword)] : 0; 1114 #undef N 1115 } 1116
Indexes created Thu Oct 02 10:09:58 GMT 2025