ieee80211.c revision 1.41
1 /* $NetBSD: ieee80211.c,v 1.41 2005/11/18 16:40:08 skrll Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211.c,v 1.22 2005/08/10 16:22:29 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.41 2005/11/18 16:40:08 skrll 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 if (ic->ic_curchan == NULL) { 200 /* arbitrarily pick the first channel */ 201 ic->ic_curchan = &ic->ic_channels[i]; 202 } 203 } 204 } 205 /* validate ic->ic_curmode */ 206 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 207 ic->ic_curmode = IEEE80211_MODE_AUTO; 208 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 209 #if 0 210 /* 211 * Enable WME by default if we're capable. 212 */ 213 if (ic->ic_caps & IEEE80211_C_WME) 214 ic->ic_flags |= IEEE80211_F_WME; 215 #endif 216 (void) ieee80211_setmode(ic, ic->ic_curmode); 217 218 if (ic->ic_bintval == 0) 219 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 220 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 221 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 222 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 223 224 if (ic->ic_lintval == 0) 225 ic->ic_lintval = ic->ic_bintval; 226 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 227 228 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 229 ieee80211_node_attach(ic); 230 ieee80211_proto_attach(ic); 231 232 ieee80211_add_vap(ic); 233 234 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 235 236 /* 237 * Install a default reset method for the ioctl support. 238 * The driver is expected to fill this in before calling us. 239 */ 240 if (ic->ic_reset == NULL) 241 ic->ic_reset = ieee80211_default_reset; 242 } 243 244 void 245 ieee80211_ifdetach(struct ieee80211com *ic) 246 { 247 struct ifnet *ifp = ic->ic_ifp; 248 249 ieee80211_remove_vap(ic); 250 251 ieee80211_sysctl_detach(ic); 252 ieee80211_proto_detach(ic); 253 ieee80211_crypto_detach(ic); 254 ieee80211_node_detach(ic); 255 LIST_REMOVE(ic, ic_list); 256 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 257 258 IEEE80211_BEACON_LOCK_DESTROY(ic); 259 260 #if NBPFILTER > 0 261 bpfdetach(ifp); 262 #endif 263 ether_ifdetach(ifp); 264 } 265 266 /* 267 * Convert MHz frequency to IEEE channel number. 268 */ 269 u_int 270 ieee80211_mhz2ieee(u_int freq, u_int flags) 271 { 272 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 273 if (freq == 2484) 274 return 14; 275 if (freq < 2484) 276 return (freq - 2407) / 5; 277 else 278 return 15 + ((freq - 2512) / 20); 279 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 280 return (freq - 5000) / 5; 281 } else { /* either, guess */ 282 if (freq == 2484) 283 return 14; 284 if (freq < 2484) 285 return (freq - 2407) / 5; 286 if (freq < 5000) 287 return 15 + ((freq - 2512) / 20); 288 return (freq - 5000) / 5; 289 } 290 } 291 292 /* 293 * Convert channel to IEEE channel number. 294 */ 295 u_int 296 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 297 { 298 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 299 return c - ic->ic_channels; 300 else if (c == IEEE80211_CHAN_ANYC) 301 return IEEE80211_CHAN_ANY; 302 else if (c != NULL) { 303 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 304 c->ic_freq, c->ic_flags); 305 return 0; /* XXX */ 306 } else { 307 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 308 return 0; /* XXX */ 309 } 310 } 311 312 /* 313 * Convert IEEE channel number to MHz frequency. 314 */ 315 u_int 316 ieee80211_ieee2mhz(u_int chan, u_int flags) 317 { 318 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 319 if (chan == 14) 320 return 2484; 321 if (chan < 14) 322 return 2407 + chan*5; 323 else 324 return 2512 + ((chan-15)*20); 325 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 326 return 5000 + (chan*5); 327 } else { /* either, guess */ 328 if (chan == 14) 329 return 2484; 330 if (chan < 14) /* 0-13 */ 331 return 2407 + chan*5; 332 if (chan < 27) /* 15-26 */ 333 return 2512 + ((chan-15)*20); 334 return 5000 + (chan*5); 335 } 336 } 337 338 /* 339 * Setup the media data structures according to the channel and 340 * rate tables. This must be called by the driver after 341 * ieee80211_attach and before most anything else. 342 */ 343 void 344 ieee80211_media_init(struct ieee80211com *ic, 345 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 346 { 347 #define ADD(_ic, _s, _o) \ 348 ifmedia_add(&(_ic)->ic_media, \ 349 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 350 struct ifnet *ifp = ic->ic_ifp; 351 struct ifmediareq imr; 352 int i, j, mode, rate, maxrate, mword, mopt, r; 353 struct ieee80211_rateset *rs; 354 struct ieee80211_rateset allrates; 355 356 /* 357 * Do late attach work that must wait for any subclass 358 * (i.e. driver) work such as overriding methods. 359 */ 360 ieee80211_node_lateattach(ic); 361 362 #ifdef IEEE80211_NO_HOSTAP 363 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 364 #endif /* IEEE80211_NO_HOSTAP */ 365 366 /* 367 * Fill in media characteristics. 368 */ 369 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 370 maxrate = 0; 371 memset(&allrates, 0, sizeof(allrates)); 372 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 373 static const u_int mopts[] = { 374 IFM_AUTO, 375 IFM_IEEE80211_11A, 376 IFM_IEEE80211_11B, 377 IFM_IEEE80211_11G, 378 IFM_IEEE80211_FH, 379 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 380 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 381 }; 382 if ((ic->ic_modecaps & (1<<mode)) == 0) 383 continue; 384 mopt = mopts[mode]; 385 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 386 if (ic->ic_caps & IEEE80211_C_IBSS) 387 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 388 if (ic->ic_caps & IEEE80211_C_HOSTAP) 389 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 390 if (ic->ic_caps & IEEE80211_C_AHDEMO) 391 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 392 if (ic->ic_caps & IEEE80211_C_MONITOR) 393 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 394 if (mode == IEEE80211_MODE_AUTO) 395 continue; 396 rs = &ic->ic_sup_rates[mode]; 397 for (i = 0; i < rs->rs_nrates; i++) { 398 rate = rs->rs_rates[i]; 399 mword = ieee80211_rate2media(ic, rate, mode); 400 if (mword == 0) 401 continue; 402 ADD(ic, mword, mopt); 403 if (ic->ic_caps & IEEE80211_C_IBSS) 404 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 405 if (ic->ic_caps & IEEE80211_C_HOSTAP) 406 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 407 if (ic->ic_caps & IEEE80211_C_AHDEMO) 408 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 409 if (ic->ic_caps & IEEE80211_C_MONITOR) 410 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 411 /* 412 * Add rate to the collection of all rates. 413 */ 414 r = rate & IEEE80211_RATE_VAL; 415 for (j = 0; j < allrates.rs_nrates; j++) 416 if (allrates.rs_rates[j] == r) 417 break; 418 if (j == allrates.rs_nrates) { 419 /* unique, add to the set */ 420 allrates.rs_rates[j] = r; 421 allrates.rs_nrates++; 422 } 423 rate = (rate & IEEE80211_RATE_VAL) / 2; 424 if (rate > maxrate) 425 maxrate = rate; 426 } 427 } 428 for (i = 0; i < allrates.rs_nrates; i++) { 429 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 430 IEEE80211_MODE_AUTO); 431 if (mword == 0) 432 continue; 433 mword = IFM_SUBTYPE(mword); /* remove media options */ 434 ADD(ic, mword, 0); 435 if (ic->ic_caps & IEEE80211_C_IBSS) 436 ADD(ic, mword, IFM_IEEE80211_ADHOC); 437 if (ic->ic_caps & IEEE80211_C_HOSTAP) 438 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 439 if (ic->ic_caps & IEEE80211_C_AHDEMO) 440 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 441 if (ic->ic_caps & IEEE80211_C_MONITOR) 442 ADD(ic, mword, IFM_IEEE80211_MONITOR); 443 } 444 ieee80211_media_status(ifp, &imr); 445 ifmedia_set(&ic->ic_media, imr.ifm_active); 446 447 if (maxrate) 448 ifp->if_baudrate = IF_Mbps(maxrate); 449 #undef ADD 450 } 451 452 void 453 ieee80211_announce(struct ieee80211com *ic) 454 { 455 struct ifnet *ifp = ic->ic_ifp; 456 int i, mode, rate, mword; 457 struct ieee80211_rateset *rs; 458 459 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 460 if ((ic->ic_modecaps & (1<<mode)) == 0) 461 continue; 462 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 463 rs = &ic->ic_sup_rates[mode]; 464 for (i = 0; i < rs->rs_nrates; i++) { 465 rate = rs->rs_rates[i]; 466 mword = ieee80211_rate2media(ic, rate, mode); 467 if (mword == 0) 468 continue; 469 printf("%s%d%sMbps", (i != 0 ? " " : ""), 470 (rate & IEEE80211_RATE_VAL) / 2, 471 ((rate & 0x1) != 0 ? ".5" : "")); 472 } 473 printf("\n"); 474 } 475 } 476 477 static int 478 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 479 { 480 #define IEEERATE(_ic,_m,_i) \ 481 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 482 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 483 for (i = 0; i < nrates; i++) 484 if (IEEERATE(ic, mode, i) == rate) 485 return i; 486 return -1; 487 #undef IEEERATE 488 } 489 490 /* 491 * Find an instance by it's mac address. 492 */ 493 struct ieee80211com * 494 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 495 { 496 int s; 497 struct ieee80211com *ic; 498 499 s = splnet(); 500 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 501 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 502 break; 503 splx(s); 504 return ic; 505 } 506 507 static struct ieee80211com * 508 ieee80211_find_instance(struct ifnet *ifp) 509 { 510 int s; 511 struct ieee80211com *ic; 512 513 s = splnet(); 514 /* XXX not right for multiple instances but works for now */ 515 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 516 if (ic->ic_ifp == ifp) 517 break; 518 splx(s); 519 return ic; 520 } 521 522 /* 523 * Handle a media change request. 524 */ 525 int 526 ieee80211_media_change(struct ifnet *ifp) 527 { 528 struct ieee80211com *ic; 529 struct ifmedia_entry *ime; 530 enum ieee80211_opmode newopmode; 531 enum ieee80211_phymode newphymode; 532 int i, j, newrate, error = 0; 533 534 ic = ieee80211_find_instance(ifp); 535 if (!ic) { 536 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 537 return EINVAL; 538 } 539 ime = ic->ic_media.ifm_cur; 540 /* 541 * First, identify the phy mode. 542 */ 543 switch (IFM_MODE(ime->ifm_media)) { 544 case IFM_IEEE80211_11A: 545 newphymode = IEEE80211_MODE_11A; 546 break; 547 case IFM_IEEE80211_11B: 548 newphymode = IEEE80211_MODE_11B; 549 break; 550 case IFM_IEEE80211_11G: 551 newphymode = IEEE80211_MODE_11G; 552 break; 553 case IFM_IEEE80211_FH: 554 newphymode = IEEE80211_MODE_FH; 555 break; 556 case IFM_AUTO: 557 newphymode = IEEE80211_MODE_AUTO; 558 break; 559 default: 560 return EINVAL; 561 } 562 /* 563 * Turbo mode is an ``option''. 564 * XXX does not apply to AUTO 565 */ 566 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 567 if (newphymode == IEEE80211_MODE_11A) 568 newphymode = IEEE80211_MODE_TURBO_A; 569 else if (newphymode == IEEE80211_MODE_11G) 570 newphymode = IEEE80211_MODE_TURBO_G; 571 else 572 return EINVAL; 573 } 574 /* 575 * Validate requested mode is available. 576 */ 577 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 578 return EINVAL; 579 580 /* 581 * Next, the fixed/variable rate. 582 */ 583 i = -1; 584 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 585 /* 586 * Convert media subtype to rate. 587 */ 588 newrate = ieee80211_media2rate(ime->ifm_media); 589 if (newrate == 0) 590 return EINVAL; 591 /* 592 * Check the rate table for the specified/current phy. 593 */ 594 if (newphymode == IEEE80211_MODE_AUTO) { 595 /* 596 * In autoselect mode search for the rate. 597 */ 598 for (j = IEEE80211_MODE_11A; 599 j < IEEE80211_MODE_MAX; j++) { 600 if ((ic->ic_modecaps & (1<<j)) == 0) 601 continue; 602 i = findrate(ic, j, newrate); 603 if (i != -1) { 604 /* lock mode too */ 605 newphymode = j; 606 break; 607 } 608 } 609 } else { 610 i = findrate(ic, newphymode, newrate); 611 } 612 if (i == -1) /* mode/rate mismatch */ 613 return EINVAL; 614 } 615 /* NB: defer rate setting to later */ 616 617 /* 618 * Deduce new operating mode but don't install it just yet. 619 */ 620 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 621 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 622 newopmode = IEEE80211_M_AHDEMO; 623 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 624 newopmode = IEEE80211_M_HOSTAP; 625 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 626 newopmode = IEEE80211_M_IBSS; 627 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 628 newopmode = IEEE80211_M_MONITOR; 629 else 630 newopmode = IEEE80211_M_STA; 631 632 #ifndef IEEE80211_NO_HOSTAP 633 /* 634 * Autoselect doesn't make sense when operating as an AP. 635 * If no phy mode has been selected, pick one and lock it 636 * down so rate tables can be used in forming beacon frames 637 * and the like. 638 */ 639 if (newopmode == IEEE80211_M_HOSTAP && 640 newphymode == IEEE80211_MODE_AUTO) { 641 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 642 if (ic->ic_modecaps & (1<<j)) { 643 newphymode = j; 644 break; 645 } 646 } 647 #endif /* !IEEE80211_NO_HOSTAP */ 648 649 /* 650 * Handle phy mode change. 651 */ 652 if (ic->ic_curmode != newphymode) { /* change phy mode */ 653 error = ieee80211_setmode(ic, newphymode); 654 if (error != 0) 655 return error; 656 error = ENETRESET; 657 } 658 659 /* 660 * Committed to changes, install the rate setting. 661 */ 662 if (ic->ic_fixed_rate != i) { 663 ic->ic_fixed_rate = i; /* set fixed tx rate */ 664 error = ENETRESET; 665 } 666 667 /* 668 * Handle operating mode change. 669 */ 670 if (ic->ic_opmode != newopmode) { 671 ic->ic_opmode = newopmode; 672 switch (newopmode) { 673 case IEEE80211_M_AHDEMO: 674 case IEEE80211_M_HOSTAP: 675 case IEEE80211_M_STA: 676 case IEEE80211_M_MONITOR: 677 ic->ic_flags &= ~IEEE80211_F_IBSSON; 678 break; 679 case IEEE80211_M_IBSS: 680 ic->ic_flags |= IEEE80211_F_IBSSON; 681 break; 682 } 683 /* 684 * Yech, slot time may change depending on the 685 * operating mode so reset it to be sure everything 686 * is setup appropriately. 687 */ 688 ieee80211_reset_erp(ic); 689 ieee80211_wme_initparams(ic); /* after opmode change */ 690 error = ENETRESET; 691 } 692 #ifdef notdef 693 if (error == 0) 694 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 695 #endif 696 return error; 697 } 698 699 void 700 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 701 { 702 struct ieee80211com *ic; 703 struct ieee80211_rateset *rs; 704 705 ic = ieee80211_find_instance(ifp); 706 if (!ic) { 707 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 708 return; 709 } 710 imr->ifm_status = IFM_AVALID; 711 imr->ifm_active = IFM_IEEE80211; 712 if (ic->ic_state == IEEE80211_S_RUN) 713 imr->ifm_status |= IFM_ACTIVE; 714 /* 715 * Calculate a current rate if possible. 716 */ 717 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 718 /* 719 * A fixed rate is set, report that. 720 */ 721 rs = &ic->ic_sup_rates[ic->ic_curmode]; 722 imr->ifm_active |= ieee80211_rate2media(ic, 723 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 724 } else if (ic->ic_opmode == IEEE80211_M_STA) { 725 /* 726 * In station mode report the current transmit rate. 727 */ 728 rs = &ic->ic_bss->ni_rates; 729 imr->ifm_active |= ieee80211_rate2media(ic, 730 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 731 } else 732 imr->ifm_active |= IFM_AUTO; 733 switch (ic->ic_opmode) { 734 case IEEE80211_M_STA: 735 break; 736 case IEEE80211_M_IBSS: 737 imr->ifm_active |= IFM_IEEE80211_ADHOC; 738 break; 739 case IEEE80211_M_AHDEMO: 740 /* should not come here */ 741 break; 742 case IEEE80211_M_HOSTAP: 743 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 744 break; 745 case IEEE80211_M_MONITOR: 746 imr->ifm_active |= IFM_IEEE80211_MONITOR; 747 break; 748 } 749 switch (ic->ic_curmode) { 750 case IEEE80211_MODE_11A: 751 imr->ifm_active |= IFM_IEEE80211_11A; 752 break; 753 case IEEE80211_MODE_11B: 754 imr->ifm_active |= IFM_IEEE80211_11B; 755 break; 756 case IEEE80211_MODE_11G: 757 imr->ifm_active |= IFM_IEEE80211_11G; 758 break; 759 case IEEE80211_MODE_FH: 760 imr->ifm_active |= IFM_IEEE80211_FH; 761 break; 762 case IEEE80211_MODE_TURBO_A: 763 imr->ifm_active |= IFM_IEEE80211_11A 764 | IFM_IEEE80211_TURBO; 765 break; 766 case IEEE80211_MODE_TURBO_G: 767 imr->ifm_active |= IFM_IEEE80211_11G 768 | IFM_IEEE80211_TURBO; 769 break; 770 } 771 } 772 773 void 774 ieee80211_watchdog(struct ieee80211com *ic) 775 { 776 struct ieee80211_node_table *nt; 777 int need_inact_timer = 0; 778 779 if (ic->ic_state != IEEE80211_S_INIT) { 780 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 781 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 782 nt = &ic->ic_scan; 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 nt = &ic->ic_sta; 789 if (nt->nt_inact_timer) { 790 if (--nt->nt_inact_timer == 0) 791 nt->nt_timeout(nt); 792 need_inact_timer += nt->nt_inact_timer; 793 } 794 } 795 if (ic->ic_mgt_timer != 0 || need_inact_timer) 796 ic->ic_ifp->if_timer = 1; 797 } 798 799 /* 800 * Set the current phy mode and recalculate the active channel 801 * set based on the available channels for this mode. Also 802 * select a new default/current channel if the current one is 803 * inappropriate for this mode. 804 */ 805 int 806 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 807 { 808 #define N(a) (sizeof(a) / sizeof(a[0])) 809 static const u_int chanflags[] = { 810 0, /* IEEE80211_MODE_AUTO */ 811 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 812 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 813 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 814 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 815 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 816 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 817 }; 818 struct ieee80211_channel *c; 819 u_int modeflags; 820 int i; 821 822 /* validate new mode */ 823 if ((ic->ic_modecaps & (1<<mode)) == 0) { 824 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 825 "%s: mode %u not supported (caps 0x%x)\n", 826 __func__, mode, ic->ic_modecaps); 827 return EINVAL; 828 } 829 830 /* 831 * Verify at least one channel is present in the available 832 * channel list before committing to the new mode. 833 */ 834 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 835 modeflags = chanflags[mode]; 836 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 837 c = &ic->ic_channels[i]; 838 if (mode == IEEE80211_MODE_AUTO) { 839 /* ignore turbo channels for autoselect */ 840 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 841 break; 842 } else { 843 if ((c->ic_flags & modeflags) == modeflags) 844 break; 845 } 846 } 847 if (i > IEEE80211_CHAN_MAX) { 848 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 849 "%s: no channels found for mode %u\n", __func__, mode); 850 return EINVAL; 851 } 852 853 /* 854 * Calculate the active channel set. 855 */ 856 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 857 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 858 c = &ic->ic_channels[i]; 859 if (mode == IEEE80211_MODE_AUTO) { 860 /* take anything but pure turbo channels */ 861 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 862 setbit(ic->ic_chan_active, i); 863 } else { 864 if ((c->ic_flags & modeflags) == modeflags) 865 setbit(ic->ic_chan_active, i); 866 } 867 } 868 /* 869 * If no current/default channel is setup or the current 870 * channel is wrong for the mode then pick the first 871 * available channel from the active list. This is likely 872 * not the right one. 873 */ 874 if (ic->ic_ibss_chan == NULL || 875 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 876 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 877 if (isset(ic->ic_chan_active, i)) { 878 ic->ic_ibss_chan = &ic->ic_channels[i]; 879 break; 880 } 881 IASSERT(ic->ic_ibss_chan != NULL && 882 isset(ic->ic_chan_active, 883 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 884 ("Bad IBSS channel %u", 885 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 886 } 887 /* 888 * If the desired channel is set but no longer valid then reset it. 889 */ 890 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 891 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 892 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 893 894 /* 895 * Do mode-specific rate setup. 896 */ 897 if (mode == IEEE80211_MODE_11G) { 898 /* 899 * Use a mixed 11b/11g rate set. 900 */ 901 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 902 IEEE80211_MODE_11G); 903 } else if (mode == IEEE80211_MODE_11B) { 904 /* 905 * Force pure 11b rate set. 906 */ 907 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 908 IEEE80211_MODE_11B); 909 } 910 /* 911 * Setup an initial rate set according to the 912 * current/default channel selected above. This 913 * will be changed when scanning but must exist 914 * now so driver have a consistent state of ic_ibss_chan. 915 */ 916 if (ic->ic_bss) /* NB: can be called before lateattach */ 917 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 918 919 ic->ic_curmode = mode; 920 ieee80211_reset_erp(ic); /* reset ERP state */ 921 ieee80211_wme_initparams(ic); /* reset WME stat */ 922 923 return 0; 924 #undef N 925 } 926 927 /* 928 * Return the phy mode for with the specified channel so the 929 * caller can select a rate set. This is problematic for channels 930 * where multiple operating modes are possible (e.g. 11g+11b). 931 * In those cases we defer to the current operating mode when set. 932 */ 933 enum ieee80211_phymode 934 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 935 { 936 if (IEEE80211_IS_CHAN_5GHZ(chan)) { 937 /* 938 * This assumes all 11a turbo channels are also 939 * usable withut turbo, which is currently true. 940 */ 941 if (ic->ic_curmode == IEEE80211_MODE_TURBO_A) 942 return IEEE80211_MODE_TURBO_A; 943 return IEEE80211_MODE_11A; 944 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 945 return IEEE80211_MODE_FH; 946 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 947 /* 948 * This assumes all 11g channels are also usable 949 * for 11b, which is currently true. 950 */ 951 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 952 return IEEE80211_MODE_TURBO_G; 953 if (ic->ic_curmode == IEEE80211_MODE_11B) 954 return IEEE80211_MODE_11B; 955 return IEEE80211_MODE_11G; 956 } else 957 return IEEE80211_MODE_11B; 958 } 959 960 /* 961 * convert IEEE80211 rate value to ifmedia subtype. 962 * ieee80211 rate is in unit of 0.5Mbps. 963 */ 964 int 965 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 966 { 967 #define N(a) (sizeof(a) / sizeof(a[0])) 968 static const struct { 969 u_int m; /* rate + mode */ 970 u_int r; /* if_media rate */ 971 } rates[] = { 972 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 973 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 974 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 975 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 976 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 977 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 978 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 979 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 980 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 981 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 982 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 983 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 984 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 985 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 986 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 987 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 988 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 989 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 990 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 991 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 992 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 993 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 994 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 995 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 996 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 997 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 998 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 999 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1000 }; 1001 u_int mask, i; 1002 1003 mask = rate & IEEE80211_RATE_VAL; 1004 switch (mode) { 1005 case IEEE80211_MODE_11A: 1006 case IEEE80211_MODE_TURBO_A: 1007 mask |= IFM_IEEE80211_11A; 1008 break; 1009 case IEEE80211_MODE_11B: 1010 mask |= IFM_IEEE80211_11B; 1011 break; 1012 case IEEE80211_MODE_FH: 1013 mask |= IFM_IEEE80211_FH; 1014 break; 1015 case IEEE80211_MODE_AUTO: 1016 /* NB: ic may be NULL for some drivers */ 1017 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1018 mask |= IFM_IEEE80211_FH; 1019 break; 1020 } 1021 /* NB: hack, 11g matches both 11b+11a rates */ 1022 /* fall thru... */ 1023 case IEEE80211_MODE_11G: 1024 case IEEE80211_MODE_TURBO_G: 1025 mask |= IFM_IEEE80211_11G; 1026 break; 1027 } 1028 for (i = 0; i < N(rates); i++) 1029 if (rates[i].m == mask) 1030 return rates[i].r; 1031 return IFM_AUTO; 1032 #undef N 1033 } 1034 1035 int 1036 ieee80211_media2rate(int mword) 1037 { 1038 #define N(a) (sizeof(a) / sizeof(a[0])) 1039 static const int ieeerates[] = { 1040 -1, /* IFM_AUTO */ 1041 0, /* IFM_MANUAL */ 1042 0, /* IFM_NONE */ 1043 2, /* IFM_IEEE80211_FH1 */ 1044 4, /* IFM_IEEE80211_FH2 */ 1045 2, /* IFM_IEEE80211_DS1 */ 1046 4, /* IFM_IEEE80211_DS2 */ 1047 11, /* IFM_IEEE80211_DS5 */ 1048 22, /* IFM_IEEE80211_DS11 */ 1049 44, /* IFM_IEEE80211_DS22 */ 1050 12, /* IFM_IEEE80211_OFDM6 */ 1051 18, /* IFM_IEEE80211_OFDM9 */ 1052 24, /* IFM_IEEE80211_OFDM12 */ 1053 36, /* IFM_IEEE80211_OFDM18 */ 1054 48, /* IFM_IEEE80211_OFDM24 */ 1055 72, /* IFM_IEEE80211_OFDM36 */ 1056 96, /* IFM_IEEE80211_OFDM48 */ 1057 108, /* IFM_IEEE80211_OFDM54 */ 1058 144, /* IFM_IEEE80211_OFDM72 */ 1059 }; 1060 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1061 ieeerates[IFM_SUBTYPE(mword)] : 0; 1062 #undef N 1063 } 1064
Indexes created Mon Sep 22 13:09:51 GMT 2025