ieee80211.c revision 1.53
1 /* $NetBSD: ieee80211.c,v 1.53 2010/04/05 07:22:24 joerg 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 1.53 2010/04/05 07:22:24 joerg Exp $"); 40 #endif 41 42 /* 43 * IEEE 802.11 generic handler 44 */ 45 46 #include "opt_inet.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/endian.h> 55 #include <sys/errno.h> 56 #include <sys/proc.h> 57 #include <sys/sysctl.h> 58 59 #include <net/if.h> 60 #include <net/if_media.h> 61 #include <net/if_arp.h> 62 #include <net/if_ether.h> 63 #include <net/if_llc.h> 64 65 #include <net80211/ieee80211_netbsd.h> 66 #include <net80211/ieee80211_var.h> 67 #include <net80211/ieee80211_sysctl.h> 68 69 #include <net/bpf.h> 70 71 #ifdef INET 72 #include <netinet/in.h> 73 #include <net/if_ether.h> 74 #endif 75 76 struct ieee80211com_head ieee80211com_head = 77 LIST_HEAD_INITIALIZER(ieee80211com_head); 78 79 const char *ieee80211_phymode_name[] = { 80 "auto", /* IEEE80211_MODE_AUTO */ 81 "11a", /* IEEE80211_MODE_11A */ 82 "11b", /* IEEE80211_MODE_11B */ 83 "11g", /* IEEE80211_MODE_11G */ 84 "FH", /* IEEE80211_MODE_FH */ 85 "turboA", /* IEEE80211_MODE_TURBO_A */ 86 "turboG", /* IEEE80211_MODE_TURBO_G */ 87 }; 88 89 /* list of all instances */ 90 SLIST_HEAD(ieee80211_list, ieee80211com); 91 static struct ieee80211_list ieee80211_list = 92 SLIST_HEAD_INITIALIZER(ieee80211_list); 93 static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 94 95 static void 96 ieee80211_add_vap(struct ieee80211com *ic) 97 { 98 #define N(a) (sizeof(a)/sizeof(a[0])) 99 int i; 100 int s; 101 u_int8_t b; 102 103 s = splnet(); 104 ic->ic_vap = 0; 105 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 106 ic->ic_vap += NBBY; 107 if (i == N(ieee80211_vapmap)) 108 panic("vap table full"); 109 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 110 ic->ic_vap++; 111 setbit(ieee80211_vapmap, ic->ic_vap); 112 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 113 splx(s); 114 #undef N 115 } 116 117 static void 118 ieee80211_remove_vap(struct ieee80211com *ic) 119 { 120 int s; 121 122 s = splnet(); 123 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 124 IASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 125 ("invalid vap id %d", ic->ic_vap)); 126 IASSERT(isset(ieee80211_vapmap, ic->ic_vap), 127 ("vap id %d not allocated", ic->ic_vap)); 128 clrbit(ieee80211_vapmap, ic->ic_vap); 129 splx(s); 130 } 131 132 /* 133 * Default reset method for use with the ioctl support. This 134 * method is invoked after any state change in the 802.11 135 * layer that should be propagated to the hardware but not 136 * require re-initialization of the 802.11 state machine (e.g 137 * rescanning for an ap). We always return ENETRESET which 138 * should cause the driver to re-initialize the device. Drivers 139 * can override this method to implement more optimized support. 140 */ 141 static int 142 ieee80211_default_reset(struct ifnet *ifp) 143 { 144 return ENETRESET; 145 } 146 147 void 148 ieee80211_ifattach(struct ieee80211com *ic) 149 { 150 struct ifnet *ifp = ic->ic_ifp; 151 struct ieee80211_channel *c; 152 int i; 153 154 #ifdef __NetBSD__ 155 ieee80211_init(); 156 #endif /* __NetBSD__ */ 157 158 ether_ifattach(ifp, ic->ic_myaddr); 159 bpf_attach2(ifp, DLT_IEEE802_11, 160 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 161 162 ieee80211_crypto_attach(ic); 163 164 /* 165 * Fill in 802.11 available channel set, mark 166 * all available channels as active, and pick 167 * a default channel if not already specified. 168 */ 169 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 170 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 171 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 172 c = &ic->ic_channels[i]; 173 if (c->ic_flags) { 174 /* 175 * Verify driver passed us valid data. 176 */ 177 if (i != ieee80211_chan2ieee(ic, c)) { 178 if_printf(ifp, "bad channel ignored; " 179 "freq %u flags %x number %u\n", 180 c->ic_freq, c->ic_flags, i); 181 c->ic_flags = 0; /* NB: remove */ 182 continue; 183 } 184 setbit(ic->ic_chan_avail, i); 185 /* 186 * Identify mode capabilities. 187 */ 188 if (IEEE80211_IS_CHAN_A(c)) 189 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 190 if (IEEE80211_IS_CHAN_B(c)) 191 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 192 if (IEEE80211_IS_CHAN_PUREG(c)) 193 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 194 if (IEEE80211_IS_CHAN_FHSS(c)) 195 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 196 if (IEEE80211_IS_CHAN_T(c)) 197 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 198 if (IEEE80211_IS_CHAN_108G(c)) 199 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 200 if (ic->ic_curchan == NULL) { 201 /* arbitrarily pick the first channel */ 202 ic->ic_curchan = &ic->ic_channels[i]; 203 } 204 } 205 } 206 /* validate ic->ic_curmode */ 207 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 208 ic->ic_curmode = IEEE80211_MODE_AUTO; 209 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 210 #if 0 211 /* 212 * Enable WME by default if we're capable. 213 */ 214 if (ic->ic_caps & IEEE80211_C_WME) 215 ic->ic_flags |= IEEE80211_F_WME; 216 #endif 217 (void) ieee80211_setmode(ic, ic->ic_curmode); 218 219 if (ic->ic_bintval == 0) 220 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 221 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 222 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 223 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 224 225 if (ic->ic_lintval == 0) 226 ic->ic_lintval = ic->ic_bintval; 227 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 228 229 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 230 ieee80211_node_attach(ic); 231 ieee80211_proto_attach(ic); 232 233 ieee80211_add_vap(ic); 234 235 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 236 237 /* 238 * Install a default reset method for the ioctl support. 239 * The driver is expected to fill this in before calling us. 240 */ 241 if (ic->ic_reset == NULL) 242 ic->ic_reset = ieee80211_default_reset; 243 } 244 245 void 246 ieee80211_ifdetach(struct ieee80211com *ic) 247 { 248 struct ifnet *ifp = ic->ic_ifp; 249 250 ieee80211_remove_vap(ic); 251 252 ieee80211_sysctl_detach(ic); 253 ieee80211_proto_detach(ic); 254 ieee80211_crypto_detach(ic); 255 ieee80211_node_detach(ic); 256 LIST_REMOVE(ic, ic_list); 257 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 258 259 IEEE80211_BEACON_LOCK_DESTROY(ic); 260 261 bpf_detach(ifp); 262 ether_ifdetach(ifp); 263 } 264 265 /* 266 * Convert MHz frequency to IEEE channel number. 267 */ 268 u_int 269 ieee80211_mhz2ieee(u_int freq, u_int flags) 270 { 271 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 272 if (freq == 2484) 273 return 14; 274 if (freq < 2484) 275 return (freq - 2407) / 5; 276 else 277 return 15 + ((freq - 2512) / 20); 278 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5 GHz band */ 279 return (freq - 5000) / 5; 280 } else { /* either, guess */ 281 if (freq == 2484) 282 return 14; 283 if (freq < 2484) 284 return (freq - 2407) / 5; 285 if (freq < 5000) 286 return 15 + ((freq - 2512) / 20); 287 return (freq - 5000) / 5; 288 } 289 } 290 291 /* 292 * Convert channel to IEEE channel number. 293 */ 294 u_int 295 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 296 { 297 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 298 return c - ic->ic_channels; 299 else if (c == IEEE80211_CHAN_ANYC) 300 return IEEE80211_CHAN_ANY; 301 else if (c != NULL) { 302 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 303 c->ic_freq, c->ic_flags); 304 return 0; /* XXX */ 305 } else { 306 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 307 return 0; /* XXX */ 308 } 309 } 310 311 /* 312 * Convert IEEE channel number to MHz frequency. 313 */ 314 u_int 315 ieee80211_ieee2mhz(u_int chan, u_int flags) 316 { 317 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 318 if (chan == 14) 319 return 2484; 320 if (chan < 14) 321 return 2407 + chan*5; 322 else 323 return 2512 + ((chan-15)*20); 324 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5 GHz band */ 325 return 5000 + (chan*5); 326 } else { /* either, guess */ 327 if (chan == 14) 328 return 2484; 329 if (chan < 14) /* 0-13 */ 330 return 2407 + chan*5; 331 if (chan < 27) /* 15-26 */ 332 return 2512 + ((chan-15)*20); 333 return 5000 + (chan*5); 334 } 335 } 336 337 /* 338 * Setup the media data structures according to the channel and 339 * rate tables. This must be called by the driver after 340 * ieee80211_attach and before most anything else. 341 */ 342 void 343 ieee80211_media_init(struct ieee80211com *ic, 344 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 345 { 346 #define ADD(_ic, _s, _o) \ 347 ifmedia_add(&(_ic)->ic_media, \ 348 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 349 struct ifnet *ifp = ic->ic_ifp; 350 struct ifmediareq imr; 351 int i, j, mode, rate, maxrate, mword, mopt, r; 352 const struct ieee80211_rateset *rs; 353 struct ieee80211_rateset allrates; 354 355 /* 356 * Do late attach work that must wait for any subclass 357 * (i.e. driver) work such as overriding methods. 358 */ 359 ieee80211_node_lateattach(ic); 360 361 #ifdef IEEE80211_NO_HOSTAP 362 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 363 #endif /* IEEE80211_NO_HOSTAP */ 364 365 /* 366 * Fill in media characteristics. 367 */ 368 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 369 maxrate = 0; 370 memset(&allrates, 0, sizeof(allrates)); 371 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 372 static const u_int mopts[] = { 373 IFM_AUTO, 374 IFM_IEEE80211_11A, 375 IFM_IEEE80211_11B, 376 IFM_IEEE80211_11G, 377 IFM_IEEE80211_FH, 378 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 379 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 380 }; 381 if ((ic->ic_modecaps & (1<<mode)) == 0) 382 continue; 383 mopt = mopts[mode]; 384 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 385 if (ic->ic_caps & IEEE80211_C_IBSS) 386 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 387 if (ic->ic_caps & IEEE80211_C_HOSTAP) 388 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 389 if (ic->ic_caps & IEEE80211_C_AHDEMO) 390 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 391 if (ic->ic_caps & IEEE80211_C_MONITOR) 392 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 393 if (mode == IEEE80211_MODE_AUTO) 394 continue; 395 rs = &ic->ic_sup_rates[mode]; 396 for (i = 0; i < rs->rs_nrates; i++) { 397 rate = rs->rs_rates[i]; 398 mword = ieee80211_rate2media(ic, rate, mode); 399 if (mword == 0) 400 continue; 401 ADD(ic, mword, mopt); 402 if (ic->ic_caps & IEEE80211_C_IBSS) 403 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 404 if (ic->ic_caps & IEEE80211_C_HOSTAP) 405 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 406 if (ic->ic_caps & IEEE80211_C_AHDEMO) 407 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 408 if (ic->ic_caps & IEEE80211_C_MONITOR) 409 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 410 /* 411 * Add rate to the collection of all rates. 412 */ 413 r = rate & IEEE80211_RATE_VAL; 414 for (j = 0; j < allrates.rs_nrates; j++) 415 if (allrates.rs_rates[j] == r) 416 break; 417 if (j == allrates.rs_nrates) { 418 /* unique, add to the set */ 419 allrates.rs_rates[j] = r; 420 allrates.rs_nrates++; 421 } 422 rate = (rate & IEEE80211_RATE_VAL) / 2; 423 if (rate > maxrate) 424 maxrate = rate; 425 } 426 } 427 for (i = 0; i < allrates.rs_nrates; i++) { 428 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 429 IEEE80211_MODE_AUTO); 430 if (mword == 0) 431 continue; 432 mword = IFM_SUBTYPE(mword); /* remove media options */ 433 ADD(ic, mword, 0); 434 if (ic->ic_caps & IEEE80211_C_IBSS) 435 ADD(ic, mword, IFM_IEEE80211_ADHOC); 436 if (ic->ic_caps & IEEE80211_C_HOSTAP) 437 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 438 if (ic->ic_caps & IEEE80211_C_AHDEMO) 439 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 440 if (ic->ic_caps & IEEE80211_C_MONITOR) 441 ADD(ic, mword, IFM_IEEE80211_MONITOR); 442 } 443 ieee80211_media_status(ifp, &imr); 444 ifmedia_set(&ic->ic_media, imr.ifm_active); 445 446 if (maxrate) 447 ifp->if_baudrate = IF_Mbps(maxrate); 448 #undef ADD 449 } 450 451 void 452 ieee80211_announce(struct ieee80211com *ic) 453 { 454 struct ifnet *ifp = ic->ic_ifp; 455 int i, mode, rate, mword; 456 struct ieee80211_rateset *rs; 457 458 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 459 if ((ic->ic_modecaps & (1<<mode)) == 0) 460 continue; 461 aprint_normal("%s: %s rates: ", ifp->if_xname, 462 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 aprint_normal("%s%d%sMbps", (i != 0 ? " " : ""), 470 (rate & IEEE80211_RATE_VAL) / 2, 471 ((rate & 0x1) != 0 ? ".5" : "")); 472 } 473 aprint_normal("\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 const struct ieee80211_rateset ieee80211_std_rateset_11a = 800 { 8, { 12, 18, 24, 36, 48, 72, 96, 108 } }; 801 802 const struct ieee80211_rateset ieee80211_std_rateset_11b = 803 { 4, { 2, 4, 11, 22 } }; 804 805 const struct ieee80211_rateset ieee80211_std_rateset_11g = 806 { 12, { 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 } }; 807 808 /* 809 * Set the current phy mode and recalculate the active channel 810 * set based on the available channels for this mode. Also 811 * select a new default/current channel if the current one is 812 * inappropriate for this mode. 813 */ 814 int 815 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 816 { 817 #define N(a) (sizeof(a) / sizeof(a[0])) 818 static const u_int chanflags[] = { 819 0, /* IEEE80211_MODE_AUTO */ 820 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 821 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 822 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 823 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 824 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 825 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 826 }; 827 struct ieee80211_channel *c; 828 u_int modeflags; 829 int i; 830 831 /* validate new mode */ 832 if ((ic->ic_modecaps & (1<<mode)) == 0) { 833 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 834 "%s: mode %u not supported (caps 0x%x)\n", 835 __func__, mode, ic->ic_modecaps); 836 return EINVAL; 837 } 838 839 /* 840 * Verify at least one channel is present in the available 841 * channel list before committing to the new mode. 842 */ 843 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 844 modeflags = chanflags[mode]; 845 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 846 c = &ic->ic_channels[i]; 847 if (c->ic_flags == 0) 848 continue; 849 if (mode == IEEE80211_MODE_AUTO) { 850 /* ignore turbo channels for autoselect */ 851 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 852 break; 853 } else { 854 if ((c->ic_flags & modeflags) == modeflags) 855 break; 856 } 857 } 858 if (i > IEEE80211_CHAN_MAX) { 859 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 860 "%s: no channels found for mode %u\n", __func__, mode); 861 return EINVAL; 862 } 863 864 /* 865 * Calculate the active channel set. 866 */ 867 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 868 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 869 c = &ic->ic_channels[i]; 870 if (c->ic_flags == 0) 871 continue; 872 if (mode == IEEE80211_MODE_AUTO) { 873 /* take anything but pure turbo channels */ 874 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 875 setbit(ic->ic_chan_active, i); 876 } else { 877 if ((c->ic_flags & modeflags) == modeflags) 878 setbit(ic->ic_chan_active, i); 879 } 880 } 881 /* 882 * If no current/default channel is setup or the current 883 * channel is wrong for the mode then pick the first 884 * available channel from the active list. This is likely 885 * not the right one. 886 */ 887 if (ic->ic_ibss_chan == NULL || 888 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 889 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 890 if (isset(ic->ic_chan_active, i)) { 891 ic->ic_ibss_chan = &ic->ic_channels[i]; 892 break; 893 } 894 IASSERT(ic->ic_ibss_chan != NULL && 895 isset(ic->ic_chan_active, 896 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 897 ("Bad IBSS channel %u", 898 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 899 } 900 /* 901 * If the desired channel is set but no longer valid then reset it. 902 */ 903 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 904 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 905 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 906 907 /* 908 * Do mode-specific rate setup. 909 */ 910 if (mode == IEEE80211_MODE_11G) { 911 /* 912 * Use a mixed 11b/11g rate set. 913 */ 914 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 915 IEEE80211_MODE_11G); 916 } else if (mode == IEEE80211_MODE_11B) { 917 /* 918 * Force pure 11b rate set. 919 */ 920 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 921 IEEE80211_MODE_11B); 922 } 923 /* 924 * Setup an initial rate set according to the 925 * current/default channel selected above. This 926 * will be changed when scanning but must exist 927 * now so driver have a consistent state of ic_ibss_chan. 928 */ 929 if (ic->ic_bss) /* NB: can be called before lateattach */ 930 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 931 932 ic->ic_curmode = mode; 933 ieee80211_reset_erp(ic); /* reset ERP state */ 934 ieee80211_wme_initparams(ic); /* reset WME stat */ 935 936 return 0; 937 #undef N 938 } 939 940 /* 941 * Return the phy mode for with the specified channel so the 942 * caller can select a rate set. This is problematic for channels 943 * where multiple operating modes are possible (e.g. 11g+11b). 944 * In those cases we defer to the current operating mode when set. 945 */ 946 enum ieee80211_phymode 947 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 948 { 949 if (IEEE80211_IS_CHAN_T(chan)) { 950 return IEEE80211_MODE_TURBO_A; 951 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 952 return IEEE80211_MODE_11A; 953 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 954 return IEEE80211_MODE_FH; 955 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 956 /* 957 * This assumes all 11g channels are also usable 958 * for 11b, which is currently true. 959 */ 960 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 961 return IEEE80211_MODE_TURBO_G; 962 if (ic->ic_curmode == IEEE80211_MODE_11B) 963 return IEEE80211_MODE_11B; 964 return IEEE80211_MODE_11G; 965 } else 966 return IEEE80211_MODE_11B; 967 } 968 969 /* 970 * convert IEEE80211 rate value to ifmedia subtype. 971 * ieee80211 rate is in unit of 0.5Mbps. 972 */ 973 int 974 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 975 { 976 #define N(a) (sizeof(a) / sizeof(a[0])) 977 static const struct { 978 u_int m; /* rate + mode */ 979 u_int r; /* if_media rate */ 980 } rates[] = { 981 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 982 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 983 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 984 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 985 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 986 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 987 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 988 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 989 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 990 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 991 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 992 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 993 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 994 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 995 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 996 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 997 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 998 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 999 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 1000 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 1001 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 1002 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 1003 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1004 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1005 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1006 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1007 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1008 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1009 }; 1010 u_int mask, i; 1011 1012 mask = rate & IEEE80211_RATE_VAL; 1013 switch (mode) { 1014 case IEEE80211_MODE_11A: 1015 case IEEE80211_MODE_TURBO_A: 1016 mask |= IFM_IEEE80211_11A; 1017 break; 1018 case IEEE80211_MODE_11B: 1019 mask |= IFM_IEEE80211_11B; 1020 break; 1021 case IEEE80211_MODE_FH: 1022 mask |= IFM_IEEE80211_FH; 1023 break; 1024 case IEEE80211_MODE_AUTO: 1025 /* NB: ic may be NULL for some drivers */ 1026 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1027 mask |= IFM_IEEE80211_FH; 1028 break; 1029 } 1030 /* NB: hack, 11g matches both 11b+11a rates */ 1031 /* fall thru... */ 1032 case IEEE80211_MODE_11G: 1033 case IEEE80211_MODE_TURBO_G: 1034 mask |= IFM_IEEE80211_11G; 1035 break; 1036 } 1037 for (i = 0; i < N(rates); i++) 1038 if (rates[i].m == mask) 1039 return rates[i].r; 1040 return IFM_AUTO; 1041 #undef N 1042 } 1043 1044 int 1045 ieee80211_media2rate(int mword) 1046 { 1047 #define N(a) (sizeof(a) / sizeof(a[0])) 1048 static const int ieeerates[] = { 1049 -1, /* IFM_AUTO */ 1050 0, /* IFM_MANUAL */ 1051 0, /* IFM_NONE */ 1052 2, /* IFM_IEEE80211_FH1 */ 1053 4, /* IFM_IEEE80211_FH2 */ 1054 4, /* IFM_IEEE80211_DS2 */ 1055 11, /* IFM_IEEE80211_DS5 */ 1056 22, /* IFM_IEEE80211_DS11 */ 1057 2, /* IFM_IEEE80211_DS1 */ 1058 44, /* IFM_IEEE80211_DS22 */ 1059 12, /* IFM_IEEE80211_OFDM6 */ 1060 18, /* IFM_IEEE80211_OFDM9 */ 1061 24, /* IFM_IEEE80211_OFDM12 */ 1062 36, /* IFM_IEEE80211_OFDM18 */ 1063 48, /* IFM_IEEE80211_OFDM24 */ 1064 72, /* IFM_IEEE80211_OFDM36 */ 1065 96, /* IFM_IEEE80211_OFDM48 */ 1066 108, /* IFM_IEEE80211_OFDM54 */ 1067 144, /* IFM_IEEE80211_OFDM72 */ 1068 }; 1069 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1070 ieeerates[IFM_SUBTYPE(mword)] : 0; 1071 #undef N 1072 } 1073
Indexes created Tue Sep 23 23:09:58 GMT 2025