ieee80211.c revision 1.21
1 /* $NetBSD: ieee80211.c,v 1.21 2004/07/16 02:54:05 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 1.21 2004/07/16 02:54:05 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 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 184 ieee80211_node_attach(ifp); 185 ieee80211_proto_attach(ifp); 186 } 187 188 void 189 ieee80211_ifdetach(struct ifnet *ifp) 190 { 191 struct ieee80211com *ic = (void *)ifp; 192 193 ieee80211_proto_detach(ifp); 194 ieee80211_crypto_detach(ifp); 195 ieee80211_node_detach(ifp); 196 LIST_REMOVE(ic, ic_list); 197 #ifdef __FreeBSD__ 198 ifmedia_removeall(&ic->ic_media); 199 #else 200 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 201 #endif 202 #if NBPFILTER > 0 203 bpfdetach(ifp); 204 #endif 205 ether_ifdetach(ifp); 206 } 207 208 /* 209 * Convert MHz frequency to IEEE channel number. 210 */ 211 u_int 212 ieee80211_mhz2ieee(u_int freq, u_int flags) 213 { 214 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 215 if (freq == 2484) 216 return 14; 217 if (freq < 2484) 218 return (freq - 2407) / 5; 219 else 220 return 15 + ((freq - 2512) / 20); 221 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 222 return (freq - 5000) / 5; 223 } else { /* either, guess */ 224 if (freq == 2484) 225 return 14; 226 if (freq < 2484) 227 return (freq - 2407) / 5; 228 if (freq < 5000) 229 return 15 + ((freq - 2512) / 20); 230 return (freq - 5000) / 5; 231 } 232 } 233 234 /* 235 * Convert channel to IEEE channel number. 236 */ 237 u_int 238 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 239 { 240 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 241 return c - ic->ic_channels; 242 else if (c == IEEE80211_CHAN_ANYC) 243 return IEEE80211_CHAN_ANY; 244 else if (c != NULL) { 245 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 246 c->ic_freq, c->ic_flags); 247 return 0; /* XXX */ 248 } else { 249 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 250 return 0; /* XXX */ 251 } 252 } 253 254 /* 255 * Convert IEEE channel number to MHz frequency. 256 */ 257 u_int 258 ieee80211_ieee2mhz(u_int chan, u_int flags) 259 { 260 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 261 if (chan == 14) 262 return 2484; 263 if (chan < 14) 264 return 2407 + chan*5; 265 else 266 return 2512 + ((chan-15)*20); 267 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 268 return 5000 + (chan*5); 269 } else { /* either, guess */ 270 if (chan == 14) 271 return 2484; 272 if (chan < 14) /* 0-13 */ 273 return 2407 + chan*5; 274 if (chan < 27) /* 15-26 */ 275 return 2512 + ((chan-15)*20); 276 return 5000 + (chan*5); 277 } 278 } 279 280 /* 281 * Setup the media data structures according to the channel and 282 * rate tables. This must be called by the driver after 283 * ieee80211_attach and before most anything else. 284 */ 285 void 286 ieee80211_media_init(struct ifnet *ifp, 287 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 288 { 289 #define ADD(_ic, _s, _o) \ 290 ifmedia_add(&(_ic)->ic_media, \ 291 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 292 struct ieee80211com *ic = (void *)ifp; 293 struct ifmediareq imr; 294 int i, j, mode, rate, maxrate, mword, mopt, r; 295 struct ieee80211_rateset *rs; 296 struct ieee80211_rateset allrates; 297 298 /* 299 * Do late attach work that must wait for any subclass 300 * (i.e. driver) work such as overriding methods. 301 */ 302 ieee80211_node_lateattach(ifp); 303 304 /* 305 * Fill in media characteristics. 306 */ 307 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 308 maxrate = 0; 309 memset(&allrates, 0, sizeof(allrates)); 310 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 311 static const u_int mopts[] = { 312 IFM_AUTO, 313 IFM_IEEE80211_11A, 314 IFM_IEEE80211_11B, 315 IFM_IEEE80211_11G, 316 IFM_IEEE80211_FH, 317 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 318 }; 319 if ((ic->ic_modecaps & (1<<mode)) == 0) 320 continue; 321 mopt = mopts[mode]; 322 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 323 if (ic->ic_caps & IEEE80211_C_IBSS) 324 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 325 if (ic->ic_caps & IEEE80211_C_HOSTAP) 326 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 327 if (ic->ic_caps & IEEE80211_C_AHDEMO) 328 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 329 if (ic->ic_caps & IEEE80211_C_MONITOR) 330 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 331 if (mode == IEEE80211_MODE_AUTO) 332 continue; 333 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 334 rs = &ic->ic_sup_rates[mode]; 335 for (i = 0; i < rs->rs_nrates; i++) { 336 rate = rs->rs_rates[i]; 337 mword = ieee80211_rate2media(ic, rate, mode); 338 if (mword == 0) 339 continue; 340 printf("%s%d%sMbps", (i != 0 ? " " : ""), 341 (rate & IEEE80211_RATE_VAL) / 2, 342 ((rate & 0x1) != 0 ? ".5" : "")); 343 ADD(ic, mword, mopt); 344 if (ic->ic_caps & IEEE80211_C_IBSS) 345 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 346 if (ic->ic_caps & IEEE80211_C_HOSTAP) 347 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 348 if (ic->ic_caps & IEEE80211_C_AHDEMO) 349 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 350 if (ic->ic_caps & IEEE80211_C_MONITOR) 351 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 352 /* 353 * Add rate to the collection of all rates. 354 */ 355 r = rate & IEEE80211_RATE_VAL; 356 for (j = 0; j < allrates.rs_nrates; j++) 357 if (allrates.rs_rates[j] == r) 358 break; 359 if (j == allrates.rs_nrates) { 360 /* unique, add to the set */ 361 allrates.rs_rates[j] = r; 362 allrates.rs_nrates++; 363 } 364 rate = (rate & IEEE80211_RATE_VAL) / 2; 365 if (rate > maxrate) 366 maxrate = rate; 367 } 368 printf("\n"); 369 } 370 for (i = 0; i < allrates.rs_nrates; i++) { 371 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 372 IEEE80211_MODE_AUTO); 373 if (mword == 0) 374 continue; 375 mword = IFM_SUBTYPE(mword); /* remove media options */ 376 ADD(ic, mword, 0); 377 if (ic->ic_caps & IEEE80211_C_IBSS) 378 ADD(ic, mword, IFM_IEEE80211_ADHOC); 379 if (ic->ic_caps & IEEE80211_C_HOSTAP) 380 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 381 if (ic->ic_caps & IEEE80211_C_AHDEMO) 382 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 383 if (ic->ic_caps & IEEE80211_C_MONITOR) 384 ADD(ic, mword, IFM_IEEE80211_MONITOR); 385 } 386 ieee80211_media_status(ifp, &imr); 387 ifmedia_set(&ic->ic_media, imr.ifm_active); 388 389 if (maxrate) 390 ifp->if_baudrate = IF_Mbps(maxrate); 391 392 if (ic->ic_max_aid == 0) 393 ic->ic_max_aid = IEEE80211_MAX_AID; 394 395 #undef ADD 396 } 397 398 static int 399 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 400 { 401 #define IEEERATE(_ic,_m,_i) \ 402 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 403 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 404 for (i = 0; i < nrates; i++) 405 if (IEEERATE(ic, mode, i) == rate) 406 return i; 407 return -1; 408 #undef IEEERATE 409 } 410 411 /* 412 * Handle a media change request. 413 */ 414 int 415 ieee80211_media_change(struct ifnet *ifp) 416 { 417 struct ieee80211com *ic = (void *)ifp; 418 struct ifmedia_entry *ime; 419 enum ieee80211_opmode newopmode; 420 enum ieee80211_phymode newphymode; 421 int i, j, newrate, error = 0; 422 423 ime = ic->ic_media.ifm_cur; 424 /* 425 * First, identify the phy mode. 426 */ 427 switch (IFM_MODE(ime->ifm_media)) { 428 case IFM_IEEE80211_11A: 429 newphymode = IEEE80211_MODE_11A; 430 break; 431 case IFM_IEEE80211_11B: 432 newphymode = IEEE80211_MODE_11B; 433 break; 434 case IFM_IEEE80211_11G: 435 newphymode = IEEE80211_MODE_11G; 436 break; 437 case IFM_IEEE80211_FH: 438 newphymode = IEEE80211_MODE_FH; 439 break; 440 case IFM_AUTO: 441 newphymode = IEEE80211_MODE_AUTO; 442 break; 443 default: 444 return EINVAL; 445 } 446 /* 447 * Turbo mode is an ``option''. Eventually it 448 * needs to be applied to 11g too. 449 */ 450 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 451 if (newphymode != IEEE80211_MODE_11A) 452 return EINVAL; 453 newphymode = IEEE80211_MODE_TURBO; 454 } 455 /* 456 * Validate requested mode is available. 457 */ 458 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 459 return EINVAL; 460 461 /* 462 * Next, the fixed/variable rate. 463 */ 464 i = -1; 465 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 466 /* 467 * Convert media subtype to rate. 468 */ 469 newrate = ieee80211_media2rate(ime->ifm_media); 470 if (newrate == 0) 471 return EINVAL; 472 /* 473 * Check the rate table for the specified/current phy. 474 */ 475 if (newphymode == IEEE80211_MODE_AUTO) { 476 /* 477 * In autoselect mode search for the rate. 478 */ 479 for (j = IEEE80211_MODE_11A; 480 j < IEEE80211_MODE_MAX; j++) { 481 if ((ic->ic_modecaps & (1<<j)) == 0) 482 continue; 483 i = findrate(ic, j, newrate); 484 if (i != -1) { 485 /* lock mode too */ 486 newphymode = j; 487 break; 488 } 489 } 490 } else { 491 i = findrate(ic, newphymode, newrate); 492 } 493 if (i == -1) /* mode/rate mismatch */ 494 return EINVAL; 495 } 496 /* NB: defer rate setting to later */ 497 498 /* 499 * Deduce new operating mode but don't install it just yet. 500 */ 501 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 502 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 503 newopmode = IEEE80211_M_AHDEMO; 504 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 505 newopmode = IEEE80211_M_HOSTAP; 506 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 507 newopmode = IEEE80211_M_IBSS; 508 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 509 newopmode = IEEE80211_M_MONITOR; 510 else 511 newopmode = IEEE80211_M_STA; 512 513 /* 514 * Autoselect doesn't make sense when operating as an AP. 515 * If no phy mode has been selected, pick one and lock it 516 * down so rate tables can be used in forming beacon frames 517 * and the like. 518 */ 519 if (newopmode == IEEE80211_M_HOSTAP && 520 newphymode == IEEE80211_MODE_AUTO) { 521 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 522 if (ic->ic_modecaps & (1<<j)) { 523 newphymode = j; 524 break; 525 } 526 } 527 528 /* 529 * Handle phy mode change. 530 */ 531 if (ic->ic_curmode != newphymode) { /* change phy mode */ 532 error = ieee80211_setmode(ic, newphymode); 533 if (error != 0) 534 return error; 535 error = ENETRESET; 536 } 537 538 /* 539 * Committed to changes, install the rate setting. 540 */ 541 if (ic->ic_fixed_rate != i) { 542 ic->ic_fixed_rate = i; /* set fixed tx rate */ 543 error = ENETRESET; 544 } 545 546 /* 547 * Handle operating mode change. 548 */ 549 if (ic->ic_opmode != newopmode) { 550 ic->ic_opmode = newopmode; 551 switch (newopmode) { 552 case IEEE80211_M_AHDEMO: 553 case IEEE80211_M_HOSTAP: 554 case IEEE80211_M_STA: 555 case IEEE80211_M_MONITOR: 556 ic->ic_flags &= ~IEEE80211_F_IBSSON; 557 break; 558 case IEEE80211_M_IBSS: 559 ic->ic_flags |= IEEE80211_F_IBSSON; 560 #ifdef notdef 561 if (ic->ic_curmode == IEEE80211_MODE_11G) 562 ieee80211_set11gbasicrates( 563 &ic->ic_sup_rates[newphymode], 564 IEEE80211_MODE_11B); 565 #endif 566 break; 567 } 568 error = ENETRESET; 569 } 570 #ifdef notdef 571 if (error == 0) 572 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 573 #endif 574 return error; 575 } 576 577 void 578 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 579 { 580 struct ieee80211com *ic = (void *)ifp; 581 struct ieee80211_node *ni = NULL; 582 583 imr->ifm_status = IFM_AVALID; 584 imr->ifm_active = IFM_IEEE80211; 585 if (ic->ic_state == IEEE80211_S_RUN) 586 imr->ifm_status |= IFM_ACTIVE; 587 imr->ifm_active |= IFM_AUTO; 588 switch (ic->ic_opmode) { 589 case IEEE80211_M_STA: 590 ni = ic->ic_bss; 591 /* calculate rate subtype */ 592 imr->ifm_active |= ieee80211_rate2media(ic, 593 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 594 break; 595 case IEEE80211_M_IBSS: 596 imr->ifm_active |= IFM_IEEE80211_ADHOC; 597 break; 598 case IEEE80211_M_AHDEMO: 599 /* should not come here */ 600 break; 601 case IEEE80211_M_HOSTAP: 602 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 603 break; 604 case IEEE80211_M_MONITOR: 605 imr->ifm_active |= IFM_IEEE80211_MONITOR; 606 break; 607 } 608 switch (ic->ic_curmode) { 609 case IEEE80211_MODE_11A: 610 imr->ifm_active |= IFM_IEEE80211_11A; 611 break; 612 case IEEE80211_MODE_11B: 613 imr->ifm_active |= IFM_IEEE80211_11B; 614 break; 615 case IEEE80211_MODE_11G: 616 imr->ifm_active |= IFM_IEEE80211_11G; 617 break; 618 case IEEE80211_MODE_FH: 619 imr->ifm_active |= IFM_IEEE80211_FH; 620 break; 621 case IEEE80211_MODE_TURBO: 622 imr->ifm_active |= IFM_IEEE80211_11A 623 | IFM_IEEE80211_TURBO; 624 break; 625 } 626 } 627 628 void 629 ieee80211_watchdog(struct ifnet *ifp) 630 { 631 struct ieee80211com *ic = (void *)ifp; 632 633 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 634 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 635 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 636 ieee80211_timeout_nodes(ic); 637 638 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 639 ifp->if_timer = 1; 640 } 641 642 /* 643 * Mark the basic rates for the 11g rate table based on the 644 * operating mode. For real 11g we mark all the 11b rates 645 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 646 * 11b rates. There's also a pseudo 11a-mode used to mark only 647 * the basic OFDM rates. 648 */ 649 static void 650 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 651 { 652 static const struct ieee80211_rateset basic[] = { 653 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 654 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 655 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 656 { 0 }, /* IEEE80211_MODE_FH */ 657 { 0 }, /* IEEE80211_MODE_TURBO */ 658 }; 659 int i, j; 660 661 for (i = 0; i < rs->rs_nrates; i++) { 662 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 663 for (j = 0; j < basic[mode].rs_nrates; j++) 664 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 665 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 666 break; 667 } 668 } 669 } 670 671 /* 672 * Set the current phy mode and recalculate the active channel 673 * set based on the available channels for this mode. Also 674 * select a new default/current channel if the current one is 675 * inappropriate for this mode. 676 */ 677 int 678 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 679 { 680 #define N(a) (sizeof(a) / sizeof(a[0])) 681 static const u_int chanflags[] = { 682 0, /* IEEE80211_MODE_AUTO */ 683 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 684 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 685 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 686 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 687 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 688 }; 689 struct ieee80211_channel *c; 690 u_int modeflags; 691 int i; 692 693 /* validate new mode */ 694 if ((ic->ic_modecaps & (1<<mode)) == 0) { 695 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 696 __func__, mode, ic->ic_modecaps)); 697 return EINVAL; 698 } 699 700 /* 701 * Verify at least one channel is present in the available 702 * channel list before committing to the new mode. 703 */ 704 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 705 modeflags = chanflags[mode]; 706 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 707 c = &ic->ic_channels[i]; 708 if (mode == IEEE80211_MODE_AUTO) { 709 /* ignore turbo channels for autoselect */ 710 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 711 break; 712 } else { 713 if ((c->ic_flags & modeflags) == modeflags) 714 break; 715 } 716 } 717 if (i > IEEE80211_CHAN_MAX) { 718 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 719 __func__, mode)); 720 return EINVAL; 721 } 722 723 /* 724 * Calculate the active channel set. 725 */ 726 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 727 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 728 c = &ic->ic_channels[i]; 729 if (mode == IEEE80211_MODE_AUTO) { 730 /* take anything but pure turbo channels */ 731 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 732 setbit(ic->ic_chan_active, i); 733 } else { 734 if ((c->ic_flags & modeflags) == modeflags) 735 setbit(ic->ic_chan_active, i); 736 } 737 } 738 /* 739 * If no current/default channel is setup or the current 740 * channel is wrong for the mode then pick the first 741 * available channel from the active list. This is likely 742 * not the right one. 743 */ 744 if (ic->ic_ibss_chan == NULL || 745 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 746 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 747 if (isset(ic->ic_chan_active, i)) { 748 ic->ic_ibss_chan = &ic->ic_channels[i]; 749 break; 750 } 751 IASSERT(ic->ic_ibss_chan != NULL && 752 isset(ic->ic_chan_active, 753 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 754 ("Bad IBSS channel %u\n", 755 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 756 } 757 758 /* 759 * Set/reset state flags that influence beacon contents, etc. 760 * 761 * XXX what if we have stations already associated??? 762 * XXX probably not right for autoselect? 763 */ 764 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 765 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 766 if (mode == IEEE80211_MODE_11G) { 767 if (ic->ic_caps & IEEE80211_C_SHSLOT) 768 ic->ic_flags |= IEEE80211_F_SHSLOT; 769 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 770 IEEE80211_MODE_11G); 771 } else { 772 ic->ic_flags &= ~IEEE80211_F_SHSLOT; 773 } 774 775 ic->ic_curmode = mode; 776 return 0; 777 #undef N 778 } 779 780 /* 781 * Return the phy mode for with the specified channel so the 782 * caller can select a rate set. This is problematic and the 783 * work here assumes how things work elsewhere in this code. 784 * 785 * XXX never returns turbo modes -dcy 786 */ 787 enum ieee80211_phymode 788 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 789 { 790 /* 791 * NB: this assumes the channel would not be supplied to us 792 * unless it was already compatible with the current mode. 793 */ 794 if (ic->ic_curmode != IEEE80211_MODE_AUTO || 795 chan == IEEE80211_CHAN_ANYC) 796 return ic->ic_curmode; 797 /* 798 * In autoselect mode; deduce a mode based on the channel 799 * characteristics. We assume that turbo-only channels 800 * are not considered when the channel set is constructed. 801 */ 802 if (IEEE80211_IS_CHAN_5GHZ(chan)) 803 return IEEE80211_MODE_11A; 804 else if (IEEE80211_IS_CHAN_FHSS(chan)) 805 return IEEE80211_MODE_FH; 806 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 807 return IEEE80211_MODE_11G; 808 else 809 return IEEE80211_MODE_11B; 810 } 811 812 /* 813 * convert IEEE80211 rate value to ifmedia subtype. 814 * ieee80211 rate is in unit of 0.5Mbps. 815 */ 816 int 817 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 818 { 819 #define N(a) (sizeof(a) / sizeof(a[0])) 820 static const struct { 821 u_int m; /* rate + mode */ 822 u_int r; /* if_media rate */ 823 } rates[] = { 824 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 825 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 826 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 827 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 828 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 829 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 830 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 831 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 832 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 833 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 834 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 835 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 836 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 837 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 838 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 839 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 840 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 841 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 842 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 843 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 844 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 845 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 846 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 847 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 848 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 849 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 850 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 851 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 852 }; 853 u_int mask, i; 854 855 mask = rate & IEEE80211_RATE_VAL; 856 switch (mode) { 857 case IEEE80211_MODE_11A: 858 case IEEE80211_MODE_TURBO: 859 mask |= IFM_IEEE80211_11A; 860 break; 861 case IEEE80211_MODE_11B: 862 mask |= IFM_IEEE80211_11B; 863 break; 864 case IEEE80211_MODE_FH: 865 mask |= IFM_IEEE80211_FH; 866 break; 867 case IEEE80211_MODE_AUTO: 868 /* NB: ic may be NULL for some drivers */ 869 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 870 mask |= IFM_IEEE80211_FH; 871 break; 872 } 873 /* NB: hack, 11g matches both 11b+11a rates */ 874 /* fall thru... */ 875 case IEEE80211_MODE_11G: 876 mask |= IFM_IEEE80211_11G; 877 break; 878 } 879 for (i = 0; i < N(rates); i++) 880 if (rates[i].m == mask) 881 return rates[i].r; 882 return IFM_AUTO; 883 #undef N 884 } 885 886 int 887 ieee80211_media2rate(int mword) 888 { 889 #define N(a) (sizeof(a) / sizeof(a[0])) 890 int i; 891 static const struct { 892 int subtype; 893 int rate; 894 } ieeerates[] = { 895 { IFM_AUTO, -1 }, 896 { IFM_MANUAL, 0 }, 897 { IFM_NONE, 0 }, 898 { IFM_IEEE80211_FH1, 2 }, 899 { IFM_IEEE80211_FH2, 4 }, 900 { IFM_IEEE80211_DS1, 2 }, 901 { IFM_IEEE80211_DS2, 4 }, 902 { IFM_IEEE80211_DS5, 11 }, 903 { IFM_IEEE80211_DS11, 22 }, 904 { IFM_IEEE80211_DS22, 44 }, 905 { IFM_IEEE80211_OFDM6, 12 }, 906 { IFM_IEEE80211_OFDM9, 18 }, 907 { IFM_IEEE80211_OFDM12, 24 }, 908 { IFM_IEEE80211_OFDM18, 36 }, 909 { IFM_IEEE80211_OFDM24, 48 }, 910 { IFM_IEEE80211_OFDM36, 72 }, 911 { IFM_IEEE80211_OFDM48, 96 }, 912 { IFM_IEEE80211_OFDM54, 108 }, 913 { IFM_IEEE80211_OFDM72, 144 }, 914 }; 915 for (i = 0; i < N(ieeerates); i++) { 916 if (ieeerates[i].subtype == IFM_SUBTYPE(mword)) 917 return ieeerates[i].rate; 918 } 919 return 0; 920 #undef N 921 } 922 923 #ifdef __NetBSD__ 924 /* TBD factor with sysctl_ath_verify. */ 925 static int 926 sysctl_ieee80211_verify(SYSCTLFN_ARGS) 927 { 928 int error, t; 929 struct sysctlnode node; 930 931 node = *rnode; 932 t = *(int*)rnode->sysctl_data; 933 node.sysctl_data = &t; 934 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 935 if (error || newp == NULL) 936 return (error); 937 938 IEEE80211_DPRINTF(("%s: t = %d, nodenum = %d, rnodenum = %d\n", 939 __func__, t, node.sysctl_num, rnode->sysctl_num)); 940 941 if (node.sysctl_num == ieee80211_inact_max_nodenum) { 942 if (t < 1) 943 return (EINVAL); 944 t = roundup(t, IEEE80211_INACT_WAIT) / IEEE80211_INACT_WAIT; 945 #ifdef IEEE80211_DEBUG 946 } else if (node.sysctl_num == ieee80211_debug_nodenum) { 947 if (t < 0 || t > 2) 948 return (EINVAL); 949 #endif /* IEEE80211_DEBUG */ 950 } else 951 return (EINVAL); 952 953 *(int*)rnode->sysctl_data = t; 954 955 return (0); 956 } 957 958 /* 959 * Setup sysctl(3) MIB, net.ieee80211.* 960 * 961 * TBD condition CTLFLAG_PERMANENT on being an LKM or not 962 */ 963 SYSCTL_SETUP(sysctl_ieee80211, "sysctl ieee80211 subtree setup") 964 { 965 int rc; 966 struct sysctlnode *cnode, *rnode; 967 968 if ((rc = sysctl_createv(clog, 0, NULL, &rnode, 969 CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL, 970 NULL, 0, NULL, 0, CTL_NET, CTL_EOL)) != 0) 971 goto err; 972 973 if ((rc = sysctl_createv(clog, 0, &rnode, &rnode, 974 CTLFLAG_PERMANENT, CTLTYPE_NODE, "link", 975 "link-layer statistics and controls", 976 NULL, 0, NULL, 0, PF_LINK, CTL_EOL)) != 0) 977 goto err; 978 979 if ((rc = sysctl_createv(clog, 0, &rnode, &rnode, 980 CTLFLAG_PERMANENT, CTLTYPE_NODE, "ieee80211", 981 "IEEE 802.11 WLAN statistics and controls", 982 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0) 983 goto err; 984 985 #ifdef IEEE80211_DEBUG 986 987 /* control debugging printfs */ 988 if ((rc = sysctl_createv(clog, 0, &rnode, &cnode, 989 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, 990 "debug", SYSCTL_DESCR("Enable IEEE 802.11 debugging output"), 991 sysctl_ieee80211_verify, 0, &ieee80211_debug, 0, 992 CTL_CREATE, CTL_EOL)) != 0) 993 goto err; 994 995 ieee80211_debug_nodenum = cnode->sysctl_num; 996 997 #endif /* IEEE80211_DEBUG */ 998 999 /* control inactivity timer */ 1000 if ((rc = sysctl_createv(clog, 0, &rnode, &cnode, 1001 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, 1002 "maxinact", SYSCTL_DESCR("Station inactivity timeout"), 1003 sysctl_ieee80211_verify, 0, &ieee80211_inact_max, 1004 0, CTL_CREATE, CTL_EOL)) != 0) 1005 goto err; 1006 1007 ieee80211_inact_max_nodenum = cnode->sysctl_num; 1008 1009 return; 1010 err: 1011 printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc); 1012 } 1013 #endif /* __NetBSD__ */ 1014 1015 #ifdef __FreeBSD__ 1016 /* 1017 * Module glue. 1018 * 1019 * NB: the module name is "wlan" for compatibility with NetBSD. 1020 */ 1021 1022 static int 1023 ieee80211_modevent(module_t mod, int type, void *unused) 1024 { 1025 switch (type) { 1026 case MOD_LOAD: 1027 if (bootverbose) 1028 printf("wlan: <802.11 Link Layer>\n"); 1029 return 0; 1030 case MOD_UNLOAD: 1031 return 0; 1032 } 1033 return EINVAL; 1034 } 1035 1036 static moduledata_t ieee80211_mod = { 1037 "wlan", 1038 ieee80211_modevent, 1039 0 1040 }; 1041 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 1042 MODULE_VERSION(wlan, 1); 1043 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 1044 MODULE_DEPEND(wlan, ether, 1, 1, 1); 1045 #endif 1046
Indexes created Mon Sep 22 13:09:51 GMT 2025