ieee80211.c revision 1.38
1 /* $NetBSD: ieee80211.c,v 1.38 2005/06/26 04:31:51 dyoung 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 1.19 2005/01/27 17:39:17 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.38 2005/06/26 04:31:51 dyoung 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 ether_ifattach(ifp, ic->ic_myaddr); 156 #if NBPFILTER > 0 157 bpfattach2(ifp, DLT_IEEE802_11, 158 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 159 #endif 160 161 ieee80211_crypto_attach(ic); 162 163 /* 164 * Fill in 802.11 available channel set, mark 165 * all available channels as active, and pick 166 * a default channel if not already specified. 167 */ 168 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 169 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 170 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 171 c = &ic->ic_channels[i]; 172 if (c->ic_flags) { 173 /* 174 * Verify driver passed us valid data. 175 */ 176 if (i != ieee80211_chan2ieee(ic, c)) { 177 if_printf(ifp, "bad channel ignored; " 178 "freq %u flags %x number %u\n", 179 c->ic_freq, c->ic_flags, i); 180 c->ic_flags = 0; /* NB: remove */ 181 continue; 182 } 183 setbit(ic->ic_chan_avail, i); 184 /* 185 * Identify mode capabilities. 186 */ 187 if (IEEE80211_IS_CHAN_A(c)) 188 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 189 if (IEEE80211_IS_CHAN_B(c)) 190 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 191 if (IEEE80211_IS_CHAN_PUREG(c)) 192 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 193 if (IEEE80211_IS_CHAN_FHSS(c)) 194 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 195 if (IEEE80211_IS_CHAN_T(c)) 196 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 197 if (IEEE80211_IS_CHAN_108G(c)) 198 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 199 } 200 } 201 /* validate ic->ic_curmode */ 202 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 203 ic->ic_curmode = IEEE80211_MODE_AUTO; 204 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 205 #if 0 206 /* 207 * Enable WME by default if we're capable. 208 */ 209 if (ic->ic_caps & IEEE80211_C_WME) 210 ic->ic_flags |= IEEE80211_F_WME; 211 #endif 212 (void) ieee80211_setmode(ic, ic->ic_curmode); 213 214 if (ic->ic_lintval == 0) 215 ic->ic_lintval = IEEE80211_BINTVAL_DEFAULT; 216 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 217 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 218 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 219 220 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 221 222 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 223 ieee80211_node_attach(ic); 224 ieee80211_proto_attach(ic); 225 226 ieee80211_add_vap(ic); 227 228 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 229 230 /* 231 * Install a default reset method for the ioctl support. 232 * The driver is expected to fill this in before calling us. 233 */ 234 if (ic->ic_reset == NULL) 235 ic->ic_reset = ieee80211_default_reset; 236 } 237 238 void 239 ieee80211_ifdetach(struct ieee80211com *ic) 240 { 241 struct ifnet *ifp = ic->ic_ifp; 242 243 ieee80211_remove_vap(ic); 244 245 ieee80211_sysctl_detach(ic); 246 ieee80211_proto_detach(ic); 247 ieee80211_crypto_detach(ic); 248 ieee80211_node_detach(ic); 249 LIST_REMOVE(ic, ic_list); 250 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 251 252 IEEE80211_BEACON_LOCK_DESTROY(ic); 253 254 #if NBPFILTER > 0 255 bpfdetach(ifp); 256 #endif 257 ether_ifdetach(ifp); 258 } 259 260 /* 261 * Convert MHz frequency to IEEE channel number. 262 */ 263 u_int 264 ieee80211_mhz2ieee(u_int freq, u_int flags) 265 { 266 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 267 if (freq == 2484) 268 return 14; 269 if (freq < 2484) 270 return (freq - 2407) / 5; 271 else 272 return 15 + ((freq - 2512) / 20); 273 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 274 return (freq - 5000) / 5; 275 } else { /* either, guess */ 276 if (freq == 2484) 277 return 14; 278 if (freq < 2484) 279 return (freq - 2407) / 5; 280 if (freq < 5000) 281 return 15 + ((freq - 2512) / 20); 282 return (freq - 5000) / 5; 283 } 284 } 285 286 /* 287 * Convert channel to IEEE channel number. 288 */ 289 u_int 290 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 291 { 292 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 293 return c - ic->ic_channels; 294 else if (c == IEEE80211_CHAN_ANYC) 295 return IEEE80211_CHAN_ANY; 296 else if (c != NULL) { 297 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 298 c->ic_freq, c->ic_flags); 299 return 0; /* XXX */ 300 } else { 301 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 302 return 0; /* XXX */ 303 } 304 } 305 306 /* 307 * Convert IEEE channel number to MHz frequency. 308 */ 309 u_int 310 ieee80211_ieee2mhz(u_int chan, u_int flags) 311 { 312 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 313 if (chan == 14) 314 return 2484; 315 if (chan < 14) 316 return 2407 + chan*5; 317 else 318 return 2512 + ((chan-15)*20); 319 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 320 return 5000 + (chan*5); 321 } else { /* either, guess */ 322 if (chan == 14) 323 return 2484; 324 if (chan < 14) /* 0-13 */ 325 return 2407 + chan*5; 326 if (chan < 27) /* 15-26 */ 327 return 2512 + ((chan-15)*20); 328 return 5000 + (chan*5); 329 } 330 } 331 332 /* 333 * Setup the media data structures according to the channel and 334 * rate tables. This must be called by the driver after 335 * ieee80211_attach and before most anything else. 336 */ 337 void 338 ieee80211_media_init(struct ieee80211com *ic, 339 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 340 { 341 #define ADD(_ic, _s, _o) \ 342 ifmedia_add(&(_ic)->ic_media, \ 343 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 344 struct ifnet *ifp = ic->ic_ifp; 345 struct ifmediareq imr; 346 int i, j, mode, rate, maxrate, mword, mopt, r; 347 struct ieee80211_rateset *rs; 348 struct ieee80211_rateset allrates; 349 350 /* 351 * Do late attach work that must wait for any subclass 352 * (i.e. driver) work such as overriding methods. 353 */ 354 ieee80211_node_lateattach(ic); 355 356 #ifdef IEEE80211_NO_HOSTAP 357 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 358 #endif /* IEEE80211_NO_HOSTAP */ 359 360 /* 361 * Fill in media characteristics. 362 */ 363 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 364 maxrate = 0; 365 memset(&allrates, 0, sizeof(allrates)); 366 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 367 static const u_int mopts[] = { 368 IFM_AUTO, 369 IFM_IEEE80211_11A, 370 IFM_IEEE80211_11B, 371 IFM_IEEE80211_11G, 372 IFM_IEEE80211_FH, 373 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 374 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 375 }; 376 if ((ic->ic_modecaps & (1<<mode)) == 0) 377 continue; 378 mopt = mopts[mode]; 379 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 380 if (ic->ic_caps & IEEE80211_C_IBSS) 381 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 382 if (ic->ic_caps & IEEE80211_C_HOSTAP) 383 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 384 if (ic->ic_caps & IEEE80211_C_AHDEMO) 385 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 386 if (ic->ic_caps & IEEE80211_C_MONITOR) 387 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 388 if (mode == IEEE80211_MODE_AUTO) 389 continue; 390 rs = &ic->ic_sup_rates[mode]; 391 for (i = 0; i < rs->rs_nrates; i++) { 392 rate = rs->rs_rates[i]; 393 mword = ieee80211_rate2media(ic, rate, mode); 394 if (mword == 0) 395 continue; 396 ADD(ic, mword, mopt); 397 if (ic->ic_caps & IEEE80211_C_IBSS) 398 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 399 if (ic->ic_caps & IEEE80211_C_HOSTAP) 400 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 401 if (ic->ic_caps & IEEE80211_C_AHDEMO) 402 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 403 if (ic->ic_caps & IEEE80211_C_MONITOR) 404 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 405 /* 406 * Add rate to the collection of all rates. 407 */ 408 r = rate & IEEE80211_RATE_VAL; 409 for (j = 0; j < allrates.rs_nrates; j++) 410 if (allrates.rs_rates[j] == r) 411 break; 412 if (j == allrates.rs_nrates) { 413 /* unique, add to the set */ 414 allrates.rs_rates[j] = r; 415 allrates.rs_nrates++; 416 } 417 rate = (rate & IEEE80211_RATE_VAL) / 2; 418 if (rate > maxrate) 419 maxrate = rate; 420 } 421 } 422 for (i = 0; i < allrates.rs_nrates; i++) { 423 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 424 IEEE80211_MODE_AUTO); 425 if (mword == 0) 426 continue; 427 mword = IFM_SUBTYPE(mword); /* remove media options */ 428 ADD(ic, mword, 0); 429 if (ic->ic_caps & IEEE80211_C_IBSS) 430 ADD(ic, mword, IFM_IEEE80211_ADHOC); 431 if (ic->ic_caps & IEEE80211_C_HOSTAP) 432 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 433 if (ic->ic_caps & IEEE80211_C_AHDEMO) 434 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 435 if (ic->ic_caps & IEEE80211_C_MONITOR) 436 ADD(ic, mword, IFM_IEEE80211_MONITOR); 437 } 438 ieee80211_media_status(ifp, &imr); 439 ifmedia_set(&ic->ic_media, imr.ifm_active); 440 441 if (maxrate) 442 ifp->if_baudrate = IF_Mbps(maxrate); 443 #undef ADD 444 } 445 446 void 447 ieee80211_announce(struct ieee80211com *ic) 448 { 449 struct ifnet *ifp = ic->ic_ifp; 450 int i, mode, rate, mword; 451 struct ieee80211_rateset *rs; 452 453 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 454 if ((ic->ic_modecaps & (1<<mode)) == 0) 455 continue; 456 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 457 rs = &ic->ic_sup_rates[mode]; 458 for (i = 0; i < rs->rs_nrates; i++) { 459 rate = rs->rs_rates[i]; 460 mword = ieee80211_rate2media(ic, rate, mode); 461 if (mword == 0) 462 continue; 463 printf("%s%d%sMbps", (i != 0 ? " " : ""), 464 (rate & IEEE80211_RATE_VAL) / 2, 465 ((rate & 0x1) != 0 ? ".5" : "")); 466 } 467 printf("\n"); 468 } 469 } 470 471 static int 472 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 473 { 474 #define IEEERATE(_ic,_m,_i) \ 475 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 476 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 477 for (i = 0; i < nrates; i++) 478 if (IEEERATE(ic, mode, i) == rate) 479 return i; 480 return -1; 481 #undef IEEERATE 482 } 483 484 /* 485 * Find an instance by it's mac address. 486 */ 487 struct ieee80211com * 488 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 489 { 490 struct ieee80211com *ic; 491 492 /* XXX lock */ 493 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 494 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 495 return ic; 496 return NULL; 497 } 498 499 static struct ieee80211com * 500 ieee80211_find_instance(struct ifnet *ifp) 501 { 502 struct ieee80211com *ic; 503 504 /* XXX lock */ 505 /* XXX not right for multiple instances but works for now */ 506 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 507 if (ic->ic_ifp == ifp) 508 return ic; 509 return NULL; 510 } 511 512 /* 513 * Handle a media change request. 514 */ 515 int 516 ieee80211_media_change(struct ifnet *ifp) 517 { 518 struct ieee80211com *ic; 519 struct ifmedia_entry *ime; 520 enum ieee80211_opmode newopmode; 521 enum ieee80211_phymode newphymode; 522 int i, j, newrate, error = 0; 523 524 ic = ieee80211_find_instance(ifp); 525 if (!ic) { 526 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 527 return EINVAL; 528 } 529 ime = ic->ic_media.ifm_cur; 530 /* 531 * First, identify the phy mode. 532 */ 533 switch (IFM_MODE(ime->ifm_media)) { 534 case IFM_IEEE80211_11A: 535 newphymode = IEEE80211_MODE_11A; 536 break; 537 case IFM_IEEE80211_11B: 538 newphymode = IEEE80211_MODE_11B; 539 break; 540 case IFM_IEEE80211_11G: 541 newphymode = IEEE80211_MODE_11G; 542 break; 543 case IFM_IEEE80211_FH: 544 newphymode = IEEE80211_MODE_FH; 545 break; 546 case IFM_AUTO: 547 newphymode = IEEE80211_MODE_AUTO; 548 break; 549 default: 550 return EINVAL; 551 } 552 /* 553 * Turbo mode is an ``option''. 554 * XXX does not apply to AUTO 555 */ 556 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 557 if (newphymode == IEEE80211_MODE_11A) 558 newphymode = IEEE80211_MODE_TURBO_A; 559 else if (newphymode == IEEE80211_MODE_11G) 560 newphymode = IEEE80211_MODE_TURBO_G; 561 else 562 return EINVAL; 563 } 564 /* 565 * Validate requested mode is available. 566 */ 567 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 568 return EINVAL; 569 570 /* 571 * Next, the fixed/variable rate. 572 */ 573 i = -1; 574 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 575 /* 576 * Convert media subtype to rate. 577 */ 578 newrate = ieee80211_media2rate(ime->ifm_media); 579 if (newrate == 0) 580 return EINVAL; 581 /* 582 * Check the rate table for the specified/current phy. 583 */ 584 if (newphymode == IEEE80211_MODE_AUTO) { 585 /* 586 * In autoselect mode search for the rate. 587 */ 588 for (j = IEEE80211_MODE_11A; 589 j < IEEE80211_MODE_MAX; j++) { 590 if ((ic->ic_modecaps & (1<<j)) == 0) 591 continue; 592 i = findrate(ic, j, newrate); 593 if (i != -1) { 594 /* lock mode too */ 595 newphymode = j; 596 break; 597 } 598 } 599 } else { 600 i = findrate(ic, newphymode, newrate); 601 } 602 if (i == -1) /* mode/rate mismatch */ 603 return EINVAL; 604 } 605 /* NB: defer rate setting to later */ 606 607 /* 608 * Deduce new operating mode but don't install it just yet. 609 */ 610 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 611 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 612 newopmode = IEEE80211_M_AHDEMO; 613 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 614 newopmode = IEEE80211_M_HOSTAP; 615 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 616 newopmode = IEEE80211_M_IBSS; 617 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 618 newopmode = IEEE80211_M_MONITOR; 619 else 620 newopmode = IEEE80211_M_STA; 621 622 #ifndef IEEE80211_NO_HOSTAP 623 /* 624 * Autoselect doesn't make sense when operating as an AP. 625 * If no phy mode has been selected, pick one and lock it 626 * down so rate tables can be used in forming beacon frames 627 * and the like. 628 */ 629 if (newopmode == IEEE80211_M_HOSTAP && 630 newphymode == IEEE80211_MODE_AUTO) { 631 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 632 if (ic->ic_modecaps & (1<<j)) { 633 newphymode = j; 634 break; 635 } 636 } 637 #endif /* !IEEE80211_NO_HOSTAP */ 638 639 /* 640 * Handle phy mode change. 641 */ 642 if (ic->ic_curmode != newphymode) { /* change phy mode */ 643 error = ieee80211_setmode(ic, newphymode); 644 if (error != 0) 645 return error; 646 error = ENETRESET; 647 } 648 649 /* 650 * Committed to changes, install the rate setting. 651 */ 652 if (ic->ic_fixed_rate != i) { 653 ic->ic_fixed_rate = i; /* set fixed tx rate */ 654 error = ENETRESET; 655 } 656 657 /* 658 * Handle operating mode change. 659 */ 660 if (ic->ic_opmode != newopmode) { 661 ic->ic_opmode = newopmode; 662 switch (newopmode) { 663 case IEEE80211_M_AHDEMO: 664 case IEEE80211_M_HOSTAP: 665 case IEEE80211_M_STA: 666 case IEEE80211_M_MONITOR: 667 ic->ic_flags &= ~IEEE80211_F_IBSSON; 668 break; 669 case IEEE80211_M_IBSS: 670 ic->ic_flags |= IEEE80211_F_IBSSON; 671 break; 672 } 673 /* 674 * Yech, slot time may change depending on the 675 * operating mode so reset it to be sure everything 676 * is setup appropriately. 677 */ 678 ieee80211_reset_erp(ic); 679 ieee80211_wme_initparams(ic); /* after opmode change */ 680 error = ENETRESET; 681 } 682 #ifdef notdef 683 if (error == 0) 684 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 685 #endif 686 return error; 687 } 688 689 void 690 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 691 { 692 struct ieee80211com *ic; 693 struct ieee80211_rateset *rs; 694 695 ic = ieee80211_find_instance(ifp); 696 if (!ic) { 697 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 698 return; 699 } 700 imr->ifm_status = IFM_AVALID; 701 imr->ifm_active = IFM_IEEE80211; 702 if (ic->ic_state == IEEE80211_S_RUN) 703 imr->ifm_status |= IFM_ACTIVE; 704 /* 705 * Calculate a current rate if possible. 706 */ 707 if (ic->ic_fixed_rate != -1) { 708 /* 709 * A fixed rate is set, report that. 710 */ 711 rs = &ic->ic_sup_rates[ic->ic_curmode]; 712 imr->ifm_active |= ieee80211_rate2media(ic, 713 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 714 } else if (ic->ic_opmode == IEEE80211_M_STA) { 715 /* 716 * In station mode report the current transmit rate. 717 */ 718 rs = &ic->ic_bss->ni_rates; 719 imr->ifm_active |= ieee80211_rate2media(ic, 720 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 721 } else 722 imr->ifm_active |= IFM_AUTO; 723 switch (ic->ic_opmode) { 724 case IEEE80211_M_STA: 725 break; 726 case IEEE80211_M_IBSS: 727 imr->ifm_active |= IFM_IEEE80211_ADHOC; 728 break; 729 case IEEE80211_M_AHDEMO: 730 /* should not come here */ 731 break; 732 case IEEE80211_M_HOSTAP: 733 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 734 break; 735 case IEEE80211_M_MONITOR: 736 imr->ifm_active |= IFM_IEEE80211_MONITOR; 737 break; 738 } 739 switch (ic->ic_curmode) { 740 case IEEE80211_MODE_11A: 741 imr->ifm_active |= IFM_IEEE80211_11A; 742 break; 743 case IEEE80211_MODE_11B: 744 imr->ifm_active |= IFM_IEEE80211_11B; 745 break; 746 case IEEE80211_MODE_11G: 747 imr->ifm_active |= IFM_IEEE80211_11G; 748 break; 749 case IEEE80211_MODE_FH: 750 imr->ifm_active |= IFM_IEEE80211_FH; 751 break; 752 case IEEE80211_MODE_TURBO_A: 753 imr->ifm_active |= IFM_IEEE80211_11A 754 | IFM_IEEE80211_TURBO; 755 break; 756 case IEEE80211_MODE_TURBO_G: 757 imr->ifm_active |= IFM_IEEE80211_11G 758 | IFM_IEEE80211_TURBO; 759 break; 760 } 761 } 762 763 void 764 ieee80211_watchdog(struct ieee80211com *ic) 765 { 766 struct ieee80211_node_table *nt; 767 int need_inact_timer = 0; 768 769 if (ic->ic_state != IEEE80211_S_INIT) { 770 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 771 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 772 nt = &ic->ic_scan; 773 if (nt->nt_inact_timer) { 774 if (--nt->nt_inact_timer == 0) 775 nt->nt_timeout(nt); 776 need_inact_timer += nt->nt_inact_timer; 777 } 778 nt = &ic->ic_sta; 779 if (nt->nt_inact_timer) { 780 if (--nt->nt_inact_timer == 0) 781 nt->nt_timeout(nt); 782 need_inact_timer += nt->nt_inact_timer; 783 } 784 } 785 if (ic->ic_mgt_timer != 0 || need_inact_timer) 786 ic->ic_ifp->if_timer = 1; 787 } 788 789 /* 790 * Set the current phy mode and recalculate the active channel 791 * set based on the available channels for this mode. Also 792 * select a new default/current channel if the current one is 793 * inappropriate for this mode. 794 */ 795 int 796 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 797 { 798 #define N(a) (sizeof(a) / sizeof(a[0])) 799 static const u_int chanflags[] = { 800 0, /* IEEE80211_MODE_AUTO */ 801 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 802 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 803 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 804 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 805 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 806 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 807 }; 808 struct ieee80211_channel *c; 809 u_int modeflags; 810 int i; 811 812 /* validate new mode */ 813 if ((ic->ic_modecaps & (1<<mode)) == 0) { 814 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 815 "%s: mode %u not supported (caps 0x%x)\n", 816 __func__, mode, ic->ic_modecaps); 817 return EINVAL; 818 } 819 820 /* 821 * Verify at least one channel is present in the available 822 * channel list before committing to the new mode. 823 */ 824 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 825 modeflags = chanflags[mode]; 826 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 827 c = &ic->ic_channels[i]; 828 if (mode == IEEE80211_MODE_AUTO) { 829 /* ignore turbo channels for autoselect */ 830 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 831 break; 832 } else { 833 if ((c->ic_flags & modeflags) == modeflags) 834 break; 835 } 836 } 837 if (i > IEEE80211_CHAN_MAX) { 838 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 839 "%s: no channels found for mode %u\n", __func__, mode); 840 return EINVAL; 841 } 842 843 /* 844 * Calculate the active channel set. 845 */ 846 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 847 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 848 c = &ic->ic_channels[i]; 849 if (mode == IEEE80211_MODE_AUTO) { 850 /* take anything but pure turbo channels */ 851 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 852 setbit(ic->ic_chan_active, i); 853 } else { 854 if ((c->ic_flags & modeflags) == modeflags) 855 setbit(ic->ic_chan_active, i); 856 } 857 } 858 /* 859 * If no current/default channel is setup or the current 860 * channel is wrong for the mode then pick the first 861 * available channel from the active list. This is likely 862 * not the right one. 863 */ 864 if (ic->ic_ibss_chan == NULL || 865 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 866 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 867 if (isset(ic->ic_chan_active, i)) { 868 ic->ic_ibss_chan = &ic->ic_channels[i]; 869 break; 870 } 871 IASSERT(ic->ic_ibss_chan != NULL && 872 isset(ic->ic_chan_active, 873 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 874 ("Bad IBSS channel %u", 875 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 876 } 877 /* 878 * If the desired channel is set but no longer valid then reset it. 879 */ 880 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 881 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 882 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 883 884 /* 885 * Do mode-specific rate setup. 886 */ 887 if (mode == IEEE80211_MODE_11G) { 888 /* 889 * Use a mixed 11b/11g rate set. 890 */ 891 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 892 IEEE80211_MODE_11G); 893 } else if (mode == IEEE80211_MODE_11B) { 894 /* 895 * Force pure 11b rate set. 896 */ 897 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 898 IEEE80211_MODE_11B); 899 } 900 /* 901 * Setup an initial rate set according to the 902 * current/default channel selected above. This 903 * will be changed when scanning but must exist 904 * now so driver have a consistent state of ic_ibss_chan. 905 */ 906 if (ic->ic_bss) /* NB: can be called before lateattach */ 907 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 908 909 ic->ic_curmode = mode; 910 ieee80211_reset_erp(ic); /* reset ERP state */ 911 ieee80211_wme_initparams(ic); /* reset WME stat */ 912 913 return 0; 914 #undef N 915 } 916 917 /* 918 * Return the phy mode for with the specified channel so the 919 * caller can select a rate set. This is problematic for channels 920 * where multiple operating modes are possible (e.g. 11g+11b). 921 * In those cases we defer to the current operating mode when set. 922 */ 923 enum ieee80211_phymode 924 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 925 { 926 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 927 /* 928 * This assumes all 11a turbo channels are also 929 * usable withut turbo, which is currently true. 930 */ 931 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A) 932 return IEEE80211_MODE_TURBO_A; 933 return IEEE80211_MODE_11A; 934 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 935 return IEEE80211_MODE_FH; 936 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 937 /* 938 * This assumes all 11g channels are also usable 939 * for 11b, which is currently true. 940 */ 941 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 942 return IEEE80211_MODE_TURBO_G; 943 if (ic->ic_curmode == IEEE80211_MODE_11B) 944 return IEEE80211_MODE_11B; 945 return IEEE80211_MODE_11G; 946 } else 947 return IEEE80211_MODE_11B; 948 } 949 950 /* 951 * convert IEEE80211 rate value to ifmedia subtype. 952 * ieee80211 rate is in unit of 0.5Mbps. 953 */ 954 int 955 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 956 { 957 #define N(a) (sizeof(a) / sizeof(a[0])) 958 static const struct { 959 u_int m; /* rate + mode */ 960 u_int r; /* if_media rate */ 961 } rates[] = { 962 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 963 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 964 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 965 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 966 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 967 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 968 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 969 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 970 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 971 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 972 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 973 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 974 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 975 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 976 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 977 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 978 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 979 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 980 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 981 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 982 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 983 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 984 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 985 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 986 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 987 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 988 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 989 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 990 }; 991 u_int mask, i; 992 993 mask = rate & IEEE80211_RATE_VAL; 994 switch (mode) { 995 case IEEE80211_MODE_11A: 996 case IEEE80211_MODE_TURBO_A: 997 mask |= IFM_IEEE80211_11A; 998 break; 999 case IEEE80211_MODE_11B: 1000 mask |= IFM_IEEE80211_11B; 1001 break; 1002 case IEEE80211_MODE_FH: 1003 mask |= IFM_IEEE80211_FH; 1004 break; 1005 case IEEE80211_MODE_AUTO: 1006 /* NB: ic may be NULL for some drivers */ 1007 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1008 mask |= IFM_IEEE80211_FH; 1009 break; 1010 } 1011 /* NB: hack, 11g matches both 11b+11a rates */ 1012 /* fall thru... */ 1013 case IEEE80211_MODE_11G: 1014 case IEEE80211_MODE_TURBO_G: 1015 mask |= IFM_IEEE80211_11G; 1016 break; 1017 } 1018 for (i = 0; i < N(rates); i++) 1019 if (rates[i].m == mask) 1020 return rates[i].r; 1021 return IFM_AUTO; 1022 #undef N 1023 } 1024 1025 int 1026 ieee80211_media2rate(int mword) 1027 { 1028 #define N(a) (sizeof(a) / sizeof(a[0])) 1029 static const int ieeerates[] = { 1030 -1, /* IFM_AUTO */ 1031 0, /* IFM_MANUAL */ 1032 0, /* IFM_NONE */ 1033 2, /* IFM_IEEE80211_FH1 */ 1034 4, /* IFM_IEEE80211_FH2 */ 1035 2, /* IFM_IEEE80211_DS1 */ 1036 4, /* IFM_IEEE80211_DS2 */ 1037 11, /* IFM_IEEE80211_DS5 */ 1038 22, /* IFM_IEEE80211_DS11 */ 1039 44, /* IFM_IEEE80211_DS22 */ 1040 12, /* IFM_IEEE80211_OFDM6 */ 1041 18, /* IFM_IEEE80211_OFDM9 */ 1042 24, /* IFM_IEEE80211_OFDM12 */ 1043 36, /* IFM_IEEE80211_OFDM18 */ 1044 48, /* IFM_IEEE80211_OFDM24 */ 1045 72, /* IFM_IEEE80211_OFDM36 */ 1046 96, /* IFM_IEEE80211_OFDM48 */ 1047 108, /* IFM_IEEE80211_OFDM54 */ 1048 144, /* IFM_IEEE80211_OFDM72 */ 1049 }; 1050 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1051 ieeerates[IFM_SUBTYPE(mword)] : 0; 1052 #undef N 1053 } 1054
Indexes created Thu Oct 02 10:09:58 GMT 2025