ieee80211.c revision 1.39
1 /* $NetBSD: ieee80211.c,v 1.39 2005/07/11 17:15:30 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 1.39 2005/07/11 17:15:30 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 int s; 491 struct ieee80211com *ic; 492 493 s = splnet(); 494 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 495 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 496 break; 497 splx(s); 498 return ic; 499 } 500 501 static struct ieee80211com * 502 ieee80211_find_instance(struct ifnet *ifp) 503 { 504 int s; 505 struct ieee80211com *ic; 506 507 s = splnet(); 508 /* XXX not right for multiple instances but works for now */ 509 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 510 if (ic->ic_ifp == ifp) 511 break; 512 splx(s); 513 return ic; 514 } 515 516 /* 517 * Handle a media change request. 518 */ 519 int 520 ieee80211_media_change(struct ifnet *ifp) 521 { 522 struct ieee80211com *ic; 523 struct ifmedia_entry *ime; 524 enum ieee80211_opmode newopmode; 525 enum ieee80211_phymode newphymode; 526 int i, j, newrate, error = 0; 527 528 ic = ieee80211_find_instance(ifp); 529 if (!ic) { 530 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 531 return EINVAL; 532 } 533 ime = ic->ic_media.ifm_cur; 534 /* 535 * First, identify the phy mode. 536 */ 537 switch (IFM_MODE(ime->ifm_media)) { 538 case IFM_IEEE80211_11A: 539 newphymode = IEEE80211_MODE_11A; 540 break; 541 case IFM_IEEE80211_11B: 542 newphymode = IEEE80211_MODE_11B; 543 break; 544 case IFM_IEEE80211_11G: 545 newphymode = IEEE80211_MODE_11G; 546 break; 547 case IFM_IEEE80211_FH: 548 newphymode = IEEE80211_MODE_FH; 549 break; 550 case IFM_AUTO: 551 newphymode = IEEE80211_MODE_AUTO; 552 break; 553 default: 554 return EINVAL; 555 } 556 /* 557 * Turbo mode is an ``option''. 558 * XXX does not apply to AUTO 559 */ 560 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 561 if (newphymode == IEEE80211_MODE_11A) 562 newphymode = IEEE80211_MODE_TURBO_A; 563 else if (newphymode == IEEE80211_MODE_11G) 564 newphymode = IEEE80211_MODE_TURBO_G; 565 else 566 return EINVAL; 567 } 568 /* 569 * Validate requested mode is available. 570 */ 571 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 572 return EINVAL; 573 574 /* 575 * Next, the fixed/variable rate. 576 */ 577 i = -1; 578 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 579 /* 580 * Convert media subtype to rate. 581 */ 582 newrate = ieee80211_media2rate(ime->ifm_media); 583 if (newrate == 0) 584 return EINVAL; 585 /* 586 * Check the rate table for the specified/current phy. 587 */ 588 if (newphymode == IEEE80211_MODE_AUTO) { 589 /* 590 * In autoselect mode search for the rate. 591 */ 592 for (j = IEEE80211_MODE_11A; 593 j < IEEE80211_MODE_MAX; j++) { 594 if ((ic->ic_modecaps & (1<<j)) == 0) 595 continue; 596 i = findrate(ic, j, newrate); 597 if (i != -1) { 598 /* lock mode too */ 599 newphymode = j; 600 break; 601 } 602 } 603 } else { 604 i = findrate(ic, newphymode, newrate); 605 } 606 if (i == -1) /* mode/rate mismatch */ 607 return EINVAL; 608 } 609 /* NB: defer rate setting to later */ 610 611 /* 612 * Deduce new operating mode but don't install it just yet. 613 */ 614 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 615 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 616 newopmode = IEEE80211_M_AHDEMO; 617 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 618 newopmode = IEEE80211_M_HOSTAP; 619 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 620 newopmode = IEEE80211_M_IBSS; 621 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 622 newopmode = IEEE80211_M_MONITOR; 623 else 624 newopmode = IEEE80211_M_STA; 625 626 #ifndef IEEE80211_NO_HOSTAP 627 /* 628 * Autoselect doesn't make sense when operating as an AP. 629 * If no phy mode has been selected, pick one and lock it 630 * down so rate tables can be used in forming beacon frames 631 * and the like. 632 */ 633 if (newopmode == IEEE80211_M_HOSTAP && 634 newphymode == IEEE80211_MODE_AUTO) { 635 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 636 if (ic->ic_modecaps & (1<<j)) { 637 newphymode = j; 638 break; 639 } 640 } 641 #endif /* !IEEE80211_NO_HOSTAP */ 642 643 /* 644 * Handle phy mode change. 645 */ 646 if (ic->ic_curmode != newphymode) { /* change phy mode */ 647 error = ieee80211_setmode(ic, newphymode); 648 if (error != 0) 649 return error; 650 error = ENETRESET; 651 } 652 653 /* 654 * Committed to changes, install the rate setting. 655 */ 656 if (ic->ic_fixed_rate != i) { 657 ic->ic_fixed_rate = i; /* set fixed tx rate */ 658 error = ENETRESET; 659 } 660 661 /* 662 * Handle operating mode change. 663 */ 664 if (ic->ic_opmode != newopmode) { 665 ic->ic_opmode = newopmode; 666 switch (newopmode) { 667 case IEEE80211_M_AHDEMO: 668 case IEEE80211_M_HOSTAP: 669 case IEEE80211_M_STA: 670 case IEEE80211_M_MONITOR: 671 ic->ic_flags &= ~IEEE80211_F_IBSSON; 672 break; 673 case IEEE80211_M_IBSS: 674 ic->ic_flags |= IEEE80211_F_IBSSON; 675 break; 676 } 677 /* 678 * Yech, slot time may change depending on the 679 * operating mode so reset it to be sure everything 680 * is setup appropriately. 681 */ 682 ieee80211_reset_erp(ic); 683 ieee80211_wme_initparams(ic); /* after opmode change */ 684 error = ENETRESET; 685 } 686 #ifdef notdef 687 if (error == 0) 688 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 689 #endif 690 return error; 691 } 692 693 void 694 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 695 { 696 struct ieee80211com *ic; 697 struct ieee80211_rateset *rs; 698 699 ic = ieee80211_find_instance(ifp); 700 if (!ic) { 701 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 702 return; 703 } 704 imr->ifm_status = IFM_AVALID; 705 imr->ifm_active = IFM_IEEE80211; 706 if (ic->ic_state == IEEE80211_S_RUN) 707 imr->ifm_status |= IFM_ACTIVE; 708 /* 709 * Calculate a current rate if possible. 710 */ 711 if (ic->ic_fixed_rate != -1) { 712 /* 713 * A fixed rate is set, report that. 714 */ 715 rs = &ic->ic_sup_rates[ic->ic_curmode]; 716 imr->ifm_active |= ieee80211_rate2media(ic, 717 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 718 } else if (ic->ic_opmode == IEEE80211_M_STA) { 719 /* 720 * In station mode report the current transmit rate. 721 */ 722 rs = &ic->ic_bss->ni_rates; 723 imr->ifm_active |= ieee80211_rate2media(ic, 724 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 725 } else 726 imr->ifm_active |= IFM_AUTO; 727 switch (ic->ic_opmode) { 728 case IEEE80211_M_STA: 729 break; 730 case IEEE80211_M_IBSS: 731 imr->ifm_active |= IFM_IEEE80211_ADHOC; 732 break; 733 case IEEE80211_M_AHDEMO: 734 /* should not come here */ 735 break; 736 case IEEE80211_M_HOSTAP: 737 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 738 break; 739 case IEEE80211_M_MONITOR: 740 imr->ifm_active |= IFM_IEEE80211_MONITOR; 741 break; 742 } 743 switch (ic->ic_curmode) { 744 case IEEE80211_MODE_11A: 745 imr->ifm_active |= IFM_IEEE80211_11A; 746 break; 747 case IEEE80211_MODE_11B: 748 imr->ifm_active |= IFM_IEEE80211_11B; 749 break; 750 case IEEE80211_MODE_11G: 751 imr->ifm_active |= IFM_IEEE80211_11G; 752 break; 753 case IEEE80211_MODE_FH: 754 imr->ifm_active |= IFM_IEEE80211_FH; 755 break; 756 case IEEE80211_MODE_TURBO_A: 757 imr->ifm_active |= IFM_IEEE80211_11A 758 | IFM_IEEE80211_TURBO; 759 break; 760 case IEEE80211_MODE_TURBO_G: 761 imr->ifm_active |= IFM_IEEE80211_11G 762 | IFM_IEEE80211_TURBO; 763 break; 764 } 765 } 766 767 void 768 ieee80211_watchdog(struct ieee80211com *ic) 769 { 770 struct ieee80211_node_table *nt; 771 int need_inact_timer = 0; 772 773 if (ic->ic_state != IEEE80211_S_INIT) { 774 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 775 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 776 nt = &ic->ic_scan; 777 if (nt->nt_inact_timer) { 778 if (--nt->nt_inact_timer == 0) 779 nt->nt_timeout(nt); 780 need_inact_timer += nt->nt_inact_timer; 781 } 782 nt = &ic->ic_sta; 783 if (nt->nt_inact_timer) { 784 if (--nt->nt_inact_timer == 0) 785 nt->nt_timeout(nt); 786 need_inact_timer += nt->nt_inact_timer; 787 } 788 } 789 if (ic->ic_mgt_timer != 0 || need_inact_timer) 790 ic->ic_ifp->if_timer = 1; 791 } 792 793 /* 794 * Set the current phy mode and recalculate the active channel 795 * set based on the available channels for this mode. Also 796 * select a new default/current channel if the current one is 797 * inappropriate for this mode. 798 */ 799 int 800 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 801 { 802 #define N(a) (sizeof(a) / sizeof(a[0])) 803 static const u_int chanflags[] = { 804 0, /* IEEE80211_MODE_AUTO */ 805 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 806 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 807 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 808 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 809 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 810 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 811 }; 812 struct ieee80211_channel *c; 813 u_int modeflags; 814 int i; 815 816 /* validate new mode */ 817 if ((ic->ic_modecaps & (1<<mode)) == 0) { 818 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 819 "%s: mode %u not supported (caps 0x%x)\n", 820 __func__, mode, ic->ic_modecaps); 821 return EINVAL; 822 } 823 824 /* 825 * Verify at least one channel is present in the available 826 * channel list before committing to the new mode. 827 */ 828 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 829 modeflags = chanflags[mode]; 830 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 831 c = &ic->ic_channels[i]; 832 if (mode == IEEE80211_MODE_AUTO) { 833 /* ignore turbo channels for autoselect */ 834 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 835 break; 836 } else { 837 if ((c->ic_flags & modeflags) == modeflags) 838 break; 839 } 840 } 841 if (i > IEEE80211_CHAN_MAX) { 842 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 843 "%s: no channels found for mode %u\n", __func__, mode); 844 return EINVAL; 845 } 846 847 /* 848 * Calculate the active channel set. 849 */ 850 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 851 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 852 c = &ic->ic_channels[i]; 853 if (mode == IEEE80211_MODE_AUTO) { 854 /* take anything but pure turbo channels */ 855 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 856 setbit(ic->ic_chan_active, i); 857 } else { 858 if ((c->ic_flags & modeflags) == modeflags) 859 setbit(ic->ic_chan_active, i); 860 } 861 } 862 /* 863 * If no current/default channel is setup or the current 864 * channel is wrong for the mode then pick the first 865 * available channel from the active list. This is likely 866 * not the right one. 867 */ 868 if (ic->ic_ibss_chan == NULL || 869 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 870 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 871 if (isset(ic->ic_chan_active, i)) { 872 ic->ic_ibss_chan = &ic->ic_channels[i]; 873 break; 874 } 875 IASSERT(ic->ic_ibss_chan != NULL && 876 isset(ic->ic_chan_active, 877 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 878 ("Bad IBSS channel %u", 879 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 880 } 881 /* 882 * If the desired channel is set but no longer valid then reset it. 883 */ 884 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 885 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 886 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 887 888 /* 889 * Do mode-specific rate setup. 890 */ 891 if (mode == IEEE80211_MODE_11G) { 892 /* 893 * Use a mixed 11b/11g rate set. 894 */ 895 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 896 IEEE80211_MODE_11G); 897 } else if (mode == IEEE80211_MODE_11B) { 898 /* 899 * Force pure 11b rate set. 900 */ 901 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 902 IEEE80211_MODE_11B); 903 } 904 /* 905 * Setup an initial rate set according to the 906 * current/default channel selected above. This 907 * will be changed when scanning but must exist 908 * now so driver have a consistent state of ic_ibss_chan. 909 */ 910 if (ic->ic_bss) /* NB: can be called before lateattach */ 911 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 912 913 ic->ic_curmode = mode; 914 ieee80211_reset_erp(ic); /* reset ERP state */ 915 ieee80211_wme_initparams(ic); /* reset WME stat */ 916 917 return 0; 918 #undef N 919 } 920 921 /* 922 * Return the phy mode for with the specified channel so the 923 * caller can select a rate set. This is problematic for channels 924 * where multiple operating modes are possible (e.g. 11g+11b). 925 * In those cases we defer to the current operating mode when set. 926 */ 927 enum ieee80211_phymode 928 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 929 { 930 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 931 /* 932 * This assumes all 11a turbo channels are also 933 * usable withut turbo, which is currently true. 934 */ 935 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A) 936 return IEEE80211_MODE_TURBO_A; 937 return IEEE80211_MODE_11A; 938 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 939 return IEEE80211_MODE_FH; 940 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 941 /* 942 * This assumes all 11g channels are also usable 943 * for 11b, which is currently true. 944 */ 945 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 946 return IEEE80211_MODE_TURBO_G; 947 if (ic->ic_curmode == IEEE80211_MODE_11B) 948 return IEEE80211_MODE_11B; 949 return IEEE80211_MODE_11G; 950 } else 951 return IEEE80211_MODE_11B; 952 } 953 954 /* 955 * convert IEEE80211 rate value to ifmedia subtype. 956 * ieee80211 rate is in unit of 0.5Mbps. 957 */ 958 int 959 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 960 { 961 #define N(a) (sizeof(a) / sizeof(a[0])) 962 static const struct { 963 u_int m; /* rate + mode */ 964 u_int r; /* if_media rate */ 965 } rates[] = { 966 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 967 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 968 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 969 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 970 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 971 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 972 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 973 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 974 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 975 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 976 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 977 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 978 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 979 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 980 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 981 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 982 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 983 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 984 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 985 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 986 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 987 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 988 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 989 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 990 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 991 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 992 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 993 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 994 }; 995 u_int mask, i; 996 997 mask = rate & IEEE80211_RATE_VAL; 998 switch (mode) { 999 case IEEE80211_MODE_11A: 1000 case IEEE80211_MODE_TURBO_A: 1001 mask |= IFM_IEEE80211_11A; 1002 break; 1003 case IEEE80211_MODE_11B: 1004 mask |= IFM_IEEE80211_11B; 1005 break; 1006 case IEEE80211_MODE_FH: 1007 mask |= IFM_IEEE80211_FH; 1008 break; 1009 case IEEE80211_MODE_AUTO: 1010 /* NB: ic may be NULL for some drivers */ 1011 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1012 mask |= IFM_IEEE80211_FH; 1013 break; 1014 } 1015 /* NB: hack, 11g matches both 11b+11a rates */ 1016 /* fall thru... */ 1017 case IEEE80211_MODE_11G: 1018 case IEEE80211_MODE_TURBO_G: 1019 mask |= IFM_IEEE80211_11G; 1020 break; 1021 } 1022 for (i = 0; i < N(rates); i++) 1023 if (rates[i].m == mask) 1024 return rates[i].r; 1025 return IFM_AUTO; 1026 #undef N 1027 } 1028 1029 int 1030 ieee80211_media2rate(int mword) 1031 { 1032 #define N(a) (sizeof(a) / sizeof(a[0])) 1033 static const int ieeerates[] = { 1034 -1, /* IFM_AUTO */ 1035 0, /* IFM_MANUAL */ 1036 0, /* IFM_NONE */ 1037 2, /* IFM_IEEE80211_FH1 */ 1038 4, /* IFM_IEEE80211_FH2 */ 1039 2, /* IFM_IEEE80211_DS1 */ 1040 4, /* IFM_IEEE80211_DS2 */ 1041 11, /* IFM_IEEE80211_DS5 */ 1042 22, /* IFM_IEEE80211_DS11 */ 1043 44, /* IFM_IEEE80211_DS22 */ 1044 12, /* IFM_IEEE80211_OFDM6 */ 1045 18, /* IFM_IEEE80211_OFDM9 */ 1046 24, /* IFM_IEEE80211_OFDM12 */ 1047 36, /* IFM_IEEE80211_OFDM18 */ 1048 48, /* IFM_IEEE80211_OFDM24 */ 1049 72, /* IFM_IEEE80211_OFDM36 */ 1050 96, /* IFM_IEEE80211_OFDM48 */ 1051 108, /* IFM_IEEE80211_OFDM54 */ 1052 144, /* IFM_IEEE80211_OFDM72 */ 1053 }; 1054 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1055 ieeerates[IFM_SUBTYPE(mword)] : 0; 1056 #undef N 1057 } 1058
Indexes created Thu Sep 25 16:09:42 GMT 2025