ieee80211.c revision 1.20
1 /* $NetBSD: ieee80211.c,v 1.20 2004/07/16 02:36:58 dyoung Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002, 2003 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 1.11 2004/04/02 20:19:20 sam Exp $"); 37 #else 38 __KERNEL_RCSID(0, "$NetBSD: ieee80211.c,v 1.20 2004/07/16 02:36:58 dyoung Exp $"); 39 #endif 40 41 /* 42 * IEEE 802.11 generic handler 43 */ 44 45 #include "opt_inet.h" 46 #include "bpfilter.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/malloc.h> 52 #include <sys/kernel.h> 53 #include <sys/socket.h> 54 #include <sys/sockio.h> 55 #include <sys/endian.h> 56 #include <sys/errno.h> 57 #ifdef __FreeBSD__ 58 #include <sys/bus.h> 59 #endif 60 #include <sys/proc.h> 61 #include <sys/sysctl.h> 62 63 #ifdef __FreeBSD__ 64 #include <machine/atomic.h> 65 #endif 66 67 #include <net/if.h> 68 #include <net/if_dl.h> 69 #include <net/if_media.h> 70 #include <net/if_arp.h> 71 #ifdef __FreeBSD__ 72 #include <net/ethernet.h> 73 #else 74 #include <net/if_ether.h> 75 #endif 76 #include <net/if_llc.h> 77 78 #include <net80211/ieee80211_var.h> 79 #include <net80211/ieee80211_compat.h> 80 81 #include <net/bpf.h> 82 83 #ifdef INET 84 #include <netinet/in.h> 85 #ifdef __FreeBSD__ 86 #include <netinet/if_ether.h> 87 #else 88 #include <net/if_ether.h> 89 #endif 90 #endif 91 92 #ifdef IEEE80211_DEBUG 93 int ieee80211_debug = 0; 94 #ifdef __NetBSD__ 95 static int ieee80211_debug_nodenum; 96 #endif /* __NetBSD__ */ 97 98 #ifdef __FreeBSD__ 99 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 100 0, "IEEE 802.11 media debugging printfs"); 101 #endif 102 #endif 103 104 int ieee80211_inact_max = IEEE80211_INACT_MAX; 105 static int ieee80211_inact_max_nodenum; 106 107 struct ieee80211com_head ieee80211com_head = 108 LIST_HEAD_INITIALIZER(ieee80211com_head); 109 110 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 111 enum ieee80211_phymode); 112 113 static const char *ieee80211_phymode_name[] = { 114 "auto", /* IEEE80211_MODE_AUTO */ 115 "11a", /* IEEE80211_MODE_11A */ 116 "11b", /* IEEE80211_MODE_11B */ 117 "11g", /* IEEE80211_MODE_11G */ 118 "FH", /* IEEE80211_MODE_FH */ 119 "turbo", /* IEEE80211_MODE_TURBO */ 120 }; 121 122 void 123 ieee80211_ifattach(struct ifnet *ifp) 124 { 125 struct ieee80211com *ic = (void *)ifp; 126 struct ieee80211_channel *c; 127 int i; 128 129 ether_ifattach(ifp, ic->ic_myaddr); 130 #if NBPFILTER > 0 131 bpfattach2(ifp, DLT_IEEE802_11, 132 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 133 #endif 134 ieee80211_crypto_attach(ifp); 135 136 /* 137 * Fill in 802.11 available channel set, mark 138 * all available channels as active, and pick 139 * a default channel if not already specified. 140 */ 141 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 142 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 143 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 144 c = &ic->ic_channels[i]; 145 if (c->ic_flags) { 146 /* 147 * Verify driver passed us valid data. 148 */ 149 if (i != ieee80211_chan2ieee(ic, c)) { 150 if_printf(ifp, "bad channel ignored; " 151 "freq %u flags %x number %u\n", 152 c->ic_freq, c->ic_flags, i); 153 c->ic_flags = 0; /* NB: remove */ 154 continue; 155 } 156 setbit(ic->ic_chan_avail, i); 157 /* 158 * Identify mode capabilities. 159 */ 160 if (IEEE80211_IS_CHAN_A(c)) 161 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 162 if (IEEE80211_IS_CHAN_B(c)) 163 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 164 if (IEEE80211_IS_CHAN_PUREG(c)) 165 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 166 if (IEEE80211_IS_CHAN_FHSS(c)) 167 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 168 if (IEEE80211_IS_CHAN_T(c)) 169 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 170 } 171 } 172 /* validate ic->ic_curmode */ 173 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 174 ic->ic_curmode = IEEE80211_MODE_AUTO; 175 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 176 177 (void) ieee80211_setmode(ic, ic->ic_curmode); 178 179 if (ic->ic_lintval == 0) 180 ic->ic_lintval = 100; /* default sleep */ 181 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 182 183 ieee80211_node_attach(ifp); 184 ieee80211_proto_attach(ifp); 185 } 186 187 void 188 ieee80211_ifdetach(struct ifnet *ifp) 189 { 190 struct ieee80211com *ic = (void *)ifp; 191 192 ieee80211_proto_detach(ifp); 193 ieee80211_crypto_detach(ifp); 194 ieee80211_node_detach(ifp); 195 #ifdef __FreeBSD__ 196 ifmedia_removeall(&ic->ic_media); 197 #else 198 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 199 #endif 200 #if NBPFILTER > 0 201 bpfdetach(ifp); 202 #endif 203 ether_ifdetach(ifp); 204 } 205 206 /* 207 * Convert MHz frequency to IEEE channel number. 208 */ 209 u_int 210 ieee80211_mhz2ieee(u_int freq, u_int flags) 211 { 212 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 213 if (freq == 2484) 214 return 14; 215 if (freq < 2484) 216 return (freq - 2407) / 5; 217 else 218 return 15 + ((freq - 2512) / 20); 219 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 220 return (freq - 5000) / 5; 221 } else { /* either, guess */ 222 if (freq == 2484) 223 return 14; 224 if (freq < 2484) 225 return (freq - 2407) / 5; 226 if (freq < 5000) 227 return 15 + ((freq - 2512) / 20); 228 return (freq - 5000) / 5; 229 } 230 } 231 232 /* 233 * Convert channel to IEEE channel number. 234 */ 235 u_int 236 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 237 { 238 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 239 return c - ic->ic_channels; 240 else if (c == IEEE80211_CHAN_ANYC) 241 return IEEE80211_CHAN_ANY; 242 else if (c != NULL) { 243 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 244 c->ic_freq, c->ic_flags); 245 return 0; /* XXX */ 246 } else { 247 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 248 return 0; /* XXX */ 249 } 250 } 251 252 /* 253 * Convert IEEE channel number to MHz frequency. 254 */ 255 u_int 256 ieee80211_ieee2mhz(u_int chan, u_int flags) 257 { 258 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 259 if (chan == 14) 260 return 2484; 261 if (chan < 14) 262 return 2407 + chan*5; 263 else 264 return 2512 + ((chan-15)*20); 265 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 266 return 5000 + (chan*5); 267 } else { /* either, guess */ 268 if (chan == 14) 269 return 2484; 270 if (chan < 14) /* 0-13 */ 271 return 2407 + chan*5; 272 if (chan < 27) /* 15-26 */ 273 return 2512 + ((chan-15)*20); 274 return 5000 + (chan*5); 275 } 276 } 277 278 /* 279 * Setup the media data structures according to the channel and 280 * rate tables. This must be called by the driver after 281 * ieee80211_attach and before most anything else. 282 */ 283 void 284 ieee80211_media_init(struct ifnet *ifp, 285 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 286 { 287 #define ADD(_ic, _s, _o) \ 288 ifmedia_add(&(_ic)->ic_media, \ 289 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 290 struct ieee80211com *ic = (void *)ifp; 291 struct ifmediareq imr; 292 int i, j, mode, rate, maxrate, mword, mopt, r; 293 struct ieee80211_rateset *rs; 294 struct ieee80211_rateset allrates; 295 296 /* 297 * Do late attach work that must wait for any subclass 298 * (i.e. driver) work such as overriding methods. 299 */ 300 ieee80211_node_lateattach(ifp); 301 302 /* 303 * Fill in media characteristics. 304 */ 305 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 306 maxrate = 0; 307 memset(&allrates, 0, sizeof(allrates)); 308 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 309 static const u_int mopts[] = { 310 IFM_AUTO, 311 IFM_IEEE80211_11A, 312 IFM_IEEE80211_11B, 313 IFM_IEEE80211_11G, 314 IFM_IEEE80211_FH, 315 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 316 }; 317 if ((ic->ic_modecaps & (1<<mode)) == 0) 318 continue; 319 mopt = mopts[mode]; 320 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 321 if (ic->ic_caps & IEEE80211_C_IBSS) 322 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 323 if (ic->ic_caps & IEEE80211_C_HOSTAP) 324 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 325 if (ic->ic_caps & IEEE80211_C_AHDEMO) 326 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 327 if (ic->ic_caps & IEEE80211_C_MONITOR) 328 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 329 if (mode == IEEE80211_MODE_AUTO) 330 continue; 331 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 332 rs = &ic->ic_sup_rates[mode]; 333 for (i = 0; i < rs->rs_nrates; i++) { 334 rate = rs->rs_rates[i]; 335 mword = ieee80211_rate2media(ic, rate, mode); 336 if (mword == 0) 337 continue; 338 printf("%s%d%sMbps", (i != 0 ? " " : ""), 339 (rate & IEEE80211_RATE_VAL) / 2, 340 ((rate & 0x1) != 0 ? ".5" : "")); 341 ADD(ic, mword, mopt); 342 if (ic->ic_caps & IEEE80211_C_IBSS) 343 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 344 if (ic->ic_caps & IEEE80211_C_HOSTAP) 345 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 346 if (ic->ic_caps & IEEE80211_C_AHDEMO) 347 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 348 if (ic->ic_caps & IEEE80211_C_MONITOR) 349 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 350 /* 351 * Add rate to the collection of all rates. 352 */ 353 r = rate & IEEE80211_RATE_VAL; 354 for (j = 0; j < allrates.rs_nrates; j++) 355 if (allrates.rs_rates[j] == r) 356 break; 357 if (j == allrates.rs_nrates) { 358 /* unique, add to the set */ 359 allrates.rs_rates[j] = r; 360 allrates.rs_nrates++; 361 } 362 rate = (rate & IEEE80211_RATE_VAL) / 2; 363 if (rate > maxrate) 364 maxrate = rate; 365 } 366 printf("\n"); 367 } 368 for (i = 0; i < allrates.rs_nrates; i++) { 369 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 370 IEEE80211_MODE_AUTO); 371 if (mword == 0) 372 continue; 373 mword = IFM_SUBTYPE(mword); /* remove media options */ 374 ADD(ic, mword, 0); 375 if (ic->ic_caps & IEEE80211_C_IBSS) 376 ADD(ic, mword, IFM_IEEE80211_ADHOC); 377 if (ic->ic_caps & IEEE80211_C_HOSTAP) 378 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 379 if (ic->ic_caps & IEEE80211_C_AHDEMO) 380 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 381 if (ic->ic_caps & IEEE80211_C_MONITOR) 382 ADD(ic, mword, IFM_IEEE80211_MONITOR); 383 } 384 ieee80211_media_status(ifp, &imr); 385 ifmedia_set(&ic->ic_media, imr.ifm_active); 386 387 if (maxrate) 388 ifp->if_baudrate = IF_Mbps(maxrate); 389 390 if (ic->ic_max_aid == 0) 391 ic->ic_max_aid = IEEE80211_MAX_AID; 392 393 #undef ADD 394 } 395 396 static int 397 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 398 { 399 #define IEEERATE(_ic,_m,_i) \ 400 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 401 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 402 for (i = 0; i < nrates; i++) 403 if (IEEERATE(ic, mode, i) == rate) 404 return i; 405 return -1; 406 #undef IEEERATE 407 } 408 409 /* 410 * Handle a media change request. 411 */ 412 int 413 ieee80211_media_change(struct ifnet *ifp) 414 { 415 struct ieee80211com *ic = (void *)ifp; 416 struct ifmedia_entry *ime; 417 enum ieee80211_opmode newopmode; 418 enum ieee80211_phymode newphymode; 419 int i, j, newrate, error = 0; 420 421 ime = ic->ic_media.ifm_cur; 422 /* 423 * First, identify the phy mode. 424 */ 425 switch (IFM_MODE(ime->ifm_media)) { 426 case IFM_IEEE80211_11A: 427 newphymode = IEEE80211_MODE_11A; 428 break; 429 case IFM_IEEE80211_11B: 430 newphymode = IEEE80211_MODE_11B; 431 break; 432 case IFM_IEEE80211_11G: 433 newphymode = IEEE80211_MODE_11G; 434 break; 435 case IFM_IEEE80211_FH: 436 newphymode = IEEE80211_MODE_FH; 437 break; 438 case IFM_AUTO: 439 newphymode = IEEE80211_MODE_AUTO; 440 break; 441 default: 442 return EINVAL; 443 } 444 /* 445 * Turbo mode is an ``option''. Eventually it 446 * needs to be applied to 11g too. 447 */ 448 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 449 if (newphymode != IEEE80211_MODE_11A) 450 return EINVAL; 451 newphymode = IEEE80211_MODE_TURBO; 452 } 453 /* 454 * Validate requested mode is available. 455 */ 456 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 457 return EINVAL; 458 459 /* 460 * Next, the fixed/variable rate. 461 */ 462 i = -1; 463 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 464 /* 465 * Convert media subtype to rate. 466 */ 467 newrate = ieee80211_media2rate(ime->ifm_media); 468 if (newrate == 0) 469 return EINVAL; 470 /* 471 * Check the rate table for the specified/current phy. 472 */ 473 if (newphymode == IEEE80211_MODE_AUTO) { 474 /* 475 * In autoselect mode search for the rate. 476 */ 477 for (j = IEEE80211_MODE_11A; 478 j < IEEE80211_MODE_MAX; j++) { 479 if ((ic->ic_modecaps & (1<<j)) == 0) 480 continue; 481 i = findrate(ic, j, newrate); 482 if (i != -1) { 483 /* lock mode too */ 484 newphymode = j; 485 break; 486 } 487 } 488 } else { 489 i = findrate(ic, newphymode, newrate); 490 } 491 if (i == -1) /* mode/rate mismatch */ 492 return EINVAL; 493 } 494 /* NB: defer rate setting to later */ 495 496 /* 497 * Deduce new operating mode but don't install it just yet. 498 */ 499 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 500 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 501 newopmode = IEEE80211_M_AHDEMO; 502 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 503 newopmode = IEEE80211_M_HOSTAP; 504 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 505 newopmode = IEEE80211_M_IBSS; 506 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 507 newopmode = IEEE80211_M_MONITOR; 508 else 509 newopmode = IEEE80211_M_STA; 510 511 /* 512 * Autoselect doesn't make sense when operating as an AP. 513 * If no phy mode has been selected, pick one and lock it 514 * down so rate tables can be used in forming beacon frames 515 * and the like. 516 */ 517 if (newopmode == IEEE80211_M_HOSTAP && 518 newphymode == IEEE80211_MODE_AUTO) { 519 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 520 if (ic->ic_modecaps & (1<<j)) { 521 newphymode = j; 522 break; 523 } 524 } 525 526 /* 527 * Handle phy mode change. 528 */ 529 if (ic->ic_curmode != newphymode) { /* change phy mode */ 530 error = ieee80211_setmode(ic, newphymode); 531 if (error != 0) 532 return error; 533 error = ENETRESET; 534 } 535 536 /* 537 * Committed to changes, install the rate setting. 538 */ 539 if (ic->ic_fixed_rate != i) { 540 ic->ic_fixed_rate = i; /* set fixed tx rate */ 541 error = ENETRESET; 542 } 543 544 /* 545 * Handle operating mode change. 546 */ 547 if (ic->ic_opmode != newopmode) { 548 ic->ic_opmode = newopmode; 549 switch (newopmode) { 550 case IEEE80211_M_AHDEMO: 551 case IEEE80211_M_HOSTAP: 552 case IEEE80211_M_STA: 553 case IEEE80211_M_MONITOR: 554 ic->ic_flags &= ~IEEE80211_F_IBSSON; 555 break; 556 case IEEE80211_M_IBSS: 557 ic->ic_flags |= IEEE80211_F_IBSSON; 558 #ifdef notdef 559 if (ic->ic_curmode == IEEE80211_MODE_11G) 560 ieee80211_set11gbasicrates( 561 &ic->ic_sup_rates[newphymode], 562 IEEE80211_MODE_11B); 563 #endif 564 break; 565 } 566 error = ENETRESET; 567 } 568 #ifdef notdef 569 if (error == 0) 570 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 571 #endif 572 return error; 573 } 574 575 void 576 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 577 { 578 struct ieee80211com *ic = (void *)ifp; 579 struct ieee80211_node *ni = NULL; 580 581 imr->ifm_status = IFM_AVALID; 582 imr->ifm_active = IFM_IEEE80211; 583 if (ic->ic_state == IEEE80211_S_RUN) 584 imr->ifm_status |= IFM_ACTIVE; 585 imr->ifm_active |= IFM_AUTO; 586 switch (ic->ic_opmode) { 587 case IEEE80211_M_STA: 588 ni = ic->ic_bss; 589 /* calculate rate subtype */ 590 imr->ifm_active |= ieee80211_rate2media(ic, 591 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 592 break; 593 case IEEE80211_M_IBSS: 594 imr->ifm_active |= IFM_IEEE80211_ADHOC; 595 break; 596 case IEEE80211_M_AHDEMO: 597 /* should not come here */ 598 break; 599 case IEEE80211_M_HOSTAP: 600 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 601 break; 602 case IEEE80211_M_MONITOR: 603 imr->ifm_active |= IFM_IEEE80211_MONITOR; 604 break; 605 } 606 switch (ic->ic_curmode) { 607 case IEEE80211_MODE_11A: 608 imr->ifm_active |= IFM_IEEE80211_11A; 609 break; 610 case IEEE80211_MODE_11B: 611 imr->ifm_active |= IFM_IEEE80211_11B; 612 break; 613 case IEEE80211_MODE_11G: 614 imr->ifm_active |= IFM_IEEE80211_11G; 615 break; 616 case IEEE80211_MODE_FH: 617 imr->ifm_active |= IFM_IEEE80211_FH; 618 break; 619 case IEEE80211_MODE_TURBO: 620 imr->ifm_active |= IFM_IEEE80211_11A 621 | IFM_IEEE80211_TURBO; 622 break; 623 } 624 } 625 626 void 627 ieee80211_watchdog(struct ifnet *ifp) 628 { 629 struct ieee80211com *ic = (void *)ifp; 630 631 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 632 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 633 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 634 ieee80211_timeout_nodes(ic); 635 636 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 637 ifp->if_timer = 1; 638 } 639 640 /* 641 * Mark the basic rates for the 11g rate table based on the 642 * operating mode. For real 11g we mark all the 11b rates 643 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 644 * 11b rates. There's also a pseudo 11a-mode used to mark only 645 * the basic OFDM rates. 646 */ 647 static void 648 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 649 { 650 static const struct ieee80211_rateset basic[] = { 651 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 652 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 653 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 654 { 0 }, /* IEEE80211_MODE_FH */ 655 { 0 }, /* IEEE80211_MODE_TURBO */ 656 }; 657 int i, j; 658 659 for (i = 0; i < rs->rs_nrates; i++) { 660 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 661 for (j = 0; j < basic[mode].rs_nrates; j++) 662 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 663 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 664 break; 665 } 666 } 667 } 668 669 /* 670 * Set the current phy mode and recalculate the active channel 671 * set based on the available channels for this mode. Also 672 * select a new default/current channel if the current one is 673 * inappropriate for this mode. 674 */ 675 int 676 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 677 { 678 #define N(a) (sizeof(a) / sizeof(a[0])) 679 static const u_int chanflags[] = { 680 0, /* IEEE80211_MODE_AUTO */ 681 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 682 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 683 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 684 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 685 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 686 }; 687 struct ieee80211_channel *c; 688 u_int modeflags; 689 int i; 690 691 /* validate new mode */ 692 if ((ic->ic_modecaps & (1<<mode)) == 0) { 693 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 694 __func__, mode, ic->ic_modecaps)); 695 return EINVAL; 696 } 697 698 /* 699 * Verify at least one channel is present in the available 700 * channel list before committing to the new mode. 701 */ 702 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 703 modeflags = chanflags[mode]; 704 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 705 c = &ic->ic_channels[i]; 706 if (mode == IEEE80211_MODE_AUTO) { 707 /* ignore turbo channels for autoselect */ 708 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 709 break; 710 } else { 711 if ((c->ic_flags & modeflags) == modeflags) 712 break; 713 } 714 } 715 if (i > IEEE80211_CHAN_MAX) { 716 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 717 __func__, mode)); 718 return EINVAL; 719 } 720 721 /* 722 * Calculate the active channel set. 723 */ 724 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 725 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 726 c = &ic->ic_channels[i]; 727 if (mode == IEEE80211_MODE_AUTO) { 728 /* take anything but pure turbo channels */ 729 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 730 setbit(ic->ic_chan_active, i); 731 } else { 732 if ((c->ic_flags & modeflags) == modeflags) 733 setbit(ic->ic_chan_active, i); 734 } 735 } 736 /* 737 * If no current/default channel is setup or the current 738 * channel is wrong for the mode then pick the first 739 * available channel from the active list. This is likely 740 * not the right one. 741 */ 742 if (ic->ic_ibss_chan == NULL || 743 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 744 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 745 if (isset(ic->ic_chan_active, i)) { 746 ic->ic_ibss_chan = &ic->ic_channels[i]; 747 break; 748 } 749 IASSERT(ic->ic_ibss_chan != NULL && 750 isset(ic->ic_chan_active, 751 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 752 ("Bad IBSS channel %u\n", 753 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 754 } 755 756 /* 757 * Set/reset state flags that influence beacon contents, etc. 758 * 759 * XXX what if we have stations already associated??? 760 * XXX probably not right for autoselect? 761 */ 762 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 763 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 764 if (mode == IEEE80211_MODE_11G) { 765 if (ic->ic_caps & IEEE80211_C_SHSLOT) 766 ic->ic_flags |= IEEE80211_F_SHSLOT; 767 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 768 IEEE80211_MODE_11G); 769 } else { 770 ic->ic_flags &= ~IEEE80211_F_SHSLOT; 771 } 772 773 ic->ic_curmode = mode; 774 return 0; 775 #undef N 776 } 777 778 /* 779 * Return the phy mode for with the specified channel so the 780 * caller can select a rate set. This is problematic and the 781 * work here assumes how things work elsewhere in this code. 782 * 783 * XXX never returns turbo modes -dcy 784 */ 785 enum ieee80211_phymode 786 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 787 { 788 /* 789 * NB: this assumes the channel would not be supplied to us 790 * unless it was already compatible with the current mode. 791 */ 792 if (ic->ic_curmode != IEEE80211_MODE_AUTO || 793 chan == IEEE80211_CHAN_ANYC) 794 return ic->ic_curmode; 795 /* 796 * In autoselect mode; deduce a mode based on the channel 797 * characteristics. We assume that turbo-only channels 798 * are not considered when the channel set is constructed. 799 */ 800 if (IEEE80211_IS_CHAN_5GHZ(chan)) 801 return IEEE80211_MODE_11A; 802 else if (IEEE80211_IS_CHAN_FHSS(chan)) 803 return IEEE80211_MODE_FH; 804 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 805 return IEEE80211_MODE_11G; 806 else 807 return IEEE80211_MODE_11B; 808 } 809 810 /* 811 * convert IEEE80211 rate value to ifmedia subtype. 812 * ieee80211 rate is in unit of 0.5Mbps. 813 */ 814 int 815 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 816 { 817 #define N(a) (sizeof(a) / sizeof(a[0])) 818 static const struct { 819 u_int m; /* rate + mode */ 820 u_int r; /* if_media rate */ 821 } rates[] = { 822 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 823 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 824 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 825 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 826 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 827 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 828 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 829 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 830 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 831 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 832 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 833 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 834 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 835 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 836 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 837 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 838 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 839 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 840 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 841 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 842 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 843 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 844 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 845 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 846 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 847 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 848 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 849 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 850 }; 851 u_int mask, i; 852 853 mask = rate & IEEE80211_RATE_VAL; 854 switch (mode) { 855 case IEEE80211_MODE_11A: 856 case IEEE80211_MODE_TURBO: 857 mask |= IFM_IEEE80211_11A; 858 break; 859 case IEEE80211_MODE_11B: 860 mask |= IFM_IEEE80211_11B; 861 break; 862 case IEEE80211_MODE_FH: 863 mask |= IFM_IEEE80211_FH; 864 break; 865 case IEEE80211_MODE_AUTO: 866 /* NB: ic may be NULL for some drivers */ 867 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 868 mask |= IFM_IEEE80211_FH; 869 break; 870 } 871 /* NB: hack, 11g matches both 11b+11a rates */ 872 /* fall thru... */ 873 case IEEE80211_MODE_11G: 874 mask |= IFM_IEEE80211_11G; 875 break; 876 } 877 for (i = 0; i < N(rates); i++) 878 if (rates[i].m == mask) 879 return rates[i].r; 880 return IFM_AUTO; 881 #undef N 882 } 883 884 int 885 ieee80211_media2rate(int mword) 886 { 887 #define N(a) (sizeof(a) / sizeof(a[0])) 888 int i; 889 static const struct { 890 int subtype; 891 int rate; 892 } ieeerates[] = { 893 { IFM_AUTO, -1 }, 894 { IFM_MANUAL, 0 }, 895 { IFM_NONE, 0 }, 896 { IFM_IEEE80211_FH1, 2 }, 897 { IFM_IEEE80211_FH2, 4 }, 898 { IFM_IEEE80211_DS1, 2 }, 899 { IFM_IEEE80211_DS2, 4 }, 900 { IFM_IEEE80211_DS5, 11 }, 901 { IFM_IEEE80211_DS11, 22 }, 902 { IFM_IEEE80211_DS22, 44 }, 903 { IFM_IEEE80211_OFDM6, 12 }, 904 { IFM_IEEE80211_OFDM9, 18 }, 905 { IFM_IEEE80211_OFDM12, 24 }, 906 { IFM_IEEE80211_OFDM18, 36 }, 907 { IFM_IEEE80211_OFDM24, 48 }, 908 { IFM_IEEE80211_OFDM36, 72 }, 909 { IFM_IEEE80211_OFDM48, 96 }, 910 { IFM_IEEE80211_OFDM54, 108 }, 911 { IFM_IEEE80211_OFDM72, 144 }, 912 }; 913 for (i = 0; i < N(ieeerates); i++) { 914 if (ieeerates[i].subtype == IFM_SUBTYPE(mword)) 915 return ieeerates[i].rate; 916 } 917 return 0; 918 #undef N 919 } 920 921 #ifdef __NetBSD__ 922 /* TBD factor with sysctl_ath_verify. */ 923 static int 924 sysctl_ieee80211_verify(SYSCTLFN_ARGS) 925 { 926 int error, t; 927 struct sysctlnode node; 928 929 node = *rnode; 930 t = *(int*)rnode->sysctl_data; 931 node.sysctl_data = &t; 932 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 933 if (error || newp == NULL) 934 return (error); 935 936 IEEE80211_DPRINTF(("%s: t = %d, nodenum = %d, rnodenum = %d\n", 937 __func__, t, node.sysctl_num, rnode->sysctl_num)); 938 939 if (node.sysctl_num == ieee80211_inact_max_nodenum) { 940 if (t < 1) 941 return (EINVAL); 942 t = roundup(t, IEEE80211_INACT_WAIT) / IEEE80211_INACT_WAIT; 943 #ifdef IEEE80211_DEBUG 944 } else if (node.sysctl_num == ieee80211_debug_nodenum) { 945 if (t < 0 || t > 2) 946 return (EINVAL); 947 #endif /* IEEE80211_DEBUG */ 948 } else 949 return (EINVAL); 950 951 *(int*)rnode->sysctl_data = t; 952 953 return (0); 954 } 955 956 /* 957 * Setup sysctl(3) MIB, net.ieee80211.* 958 * 959 * TBD condition CTLFLAG_PERMANENT on being an LKM or not 960 */ 961 SYSCTL_SETUP(sysctl_ieee80211, "sysctl ieee80211 subtree setup") 962 { 963 int rc; 964 struct sysctlnode *cnode, *rnode; 965 966 if ((rc = sysctl_createv(clog, 0, NULL, &rnode, 967 CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL, 968 NULL, 0, NULL, 0, CTL_NET, CTL_EOL)) != 0) 969 goto err; 970 971 if ((rc = sysctl_createv(clog, 0, &rnode, &rnode, 972 CTLFLAG_PERMANENT, CTLTYPE_NODE, "link", 973 "link-layer statistics and controls", 974 NULL, 0, NULL, 0, PF_LINK, CTL_EOL)) != 0) 975 goto err; 976 977 if ((rc = sysctl_createv(clog, 0, &rnode, &rnode, 978 CTLFLAG_PERMANENT, CTLTYPE_NODE, "ieee80211", 979 "IEEE 802.11 WLAN statistics and controls", 980 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0) 981 goto err; 982 983 #ifdef IEEE80211_DEBUG 984 985 /* control debugging printfs */ 986 if ((rc = sysctl_createv(clog, 0, &rnode, &cnode, 987 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, 988 "debug", SYSCTL_DESCR("Enable IEEE 802.11 debugging output"), 989 sysctl_ieee80211_verify, 0, &ieee80211_debug, 0, 990 CTL_CREATE, CTL_EOL)) != 0) 991 goto err; 992 993 ieee80211_debug_nodenum = cnode->sysctl_num; 994 995 #endif /* IEEE80211_DEBUG */ 996 997 /* control inactivity timer */ 998 if ((rc = sysctl_createv(clog, 0, &rnode, &cnode, 999 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, 1000 "maxinact", SYSCTL_DESCR("Station inactivity timeout"), 1001 sysctl_ieee80211_verify, 0, &ieee80211_inact_max, 1002 0, CTL_CREATE, CTL_EOL)) != 0) 1003 goto err; 1004 1005 ieee80211_inact_max_nodenum = cnode->sysctl_num; 1006 1007 return; 1008 err: 1009 printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc); 1010 } 1011 #endif /* __NetBSD__ */ 1012 1013 #ifdef __FreeBSD__ 1014 /* 1015 * Module glue. 1016 * 1017 * NB: the module name is "wlan" for compatibility with NetBSD. 1018 */ 1019 1020 static int 1021 ieee80211_modevent(module_t mod, int type, void *unused) 1022 { 1023 switch (type) { 1024 case MOD_LOAD: 1025 if (bootverbose) 1026 printf("wlan: <802.11 Link Layer>\n"); 1027 return 0; 1028 case MOD_UNLOAD: 1029 return 0; 1030 } 1031 return EINVAL; 1032 } 1033 1034 static moduledata_t ieee80211_mod = { 1035 "wlan", 1036 ieee80211_modevent, 1037 0 1038 }; 1039 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 1040 MODULE_VERSION(wlan, 1); 1041 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 1042 MODULE_DEPEND(wlan, ether, 1, 1, 1); 1043 #endif 1044
Indexes created Tue Sep 23 02:09:52 GMT 2025