1 /*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * Alternatively, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2 as published by the Free 19 * Software Foundation. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * IEEE 802.11 generic handler 38 */ 39 40 #include "opt_inet.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/malloc.h> 46 #include <sys/kernel.h> 47 #include <sys/module.h> 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/endian.h> 51 #include <sys/errno.h> 52 #include <sys/bus.h> 53 #include <sys/proc.h> 54 #include <sys/sysctl.h> 55 56 #include <machine/atomic.h> 57 58 #include <net/if.h> 59 #include <net/if_dl.h> 60 #include <net/if_media.h> 61 #include <net/if_arp.h> 62 #include <net/ethernet.h> 63 #include <net/if_llc.h> 64 #include <net/route.h> 65 66 #include <net80211/ieee80211_var.h> 67 68 #include <net/bpf.h> 69 70 #ifdef INET 71 #include <netinet/in.h> 72 #include <netinet/if_ether.h> 73 #endif 74 75 #ifdef IEEE80211_DEBUG 76 int ieee80211_debug = 0; 77 SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, 78 0, "IEEE 802.11 media debugging printfs"); 79 #endif 80 81 static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, 82 enum ieee80211_phymode); 83 84 static const char *ieee80211_phymode_name[] = { 85 "auto", /* IEEE80211_MODE_AUTO */ 86 "11a", /* IEEE80211_MODE_11A */ 87 "11b", /* IEEE80211_MODE_11B */ 88 "11g", /* IEEE80211_MODE_11G */ 89 "FH", /* IEEE80211_MODE_FH */ 90 "turbo", /* IEEE80211_MODE_TURBO */ 91 }; 92 93 void 94 ieee80211_ifattach(struct ifnet *ifp) 95 { 96 struct ieee80211com *ic = (void *)ifp; 97 struct ieee80211_channel *c; 98 int i; 99 100 ether_ifattach(ifp, ic->ic_myaddr); 101 bpfattach2(ifp, DLT_IEEE802_11, 102 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 103 ieee80211_crypto_attach(ifp); 104 105 /* 106 * Fill in 802.11 available channel set, mark 107 * all available channels as active, and pick 108 * a default channel if not already specified. 109 */ 110 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 111 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 112 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 113 c = &ic->ic_channels[i]; 114 if (c->ic_flags) { 115 /* 116 * Verify driver passed us valid data. 117 */ 118 if (i != ieee80211_chan2ieee(ic, c)) { 119 if_printf(ifp, "bad channel ignored; " 120 "freq %u flags %x number %u\n", 121 c->ic_freq, c->ic_flags, i); 122 c->ic_flags = 0; /* NB: remove */ 123 continue; 124 } 125 setbit(ic->ic_chan_avail, i); 126 /* 127 * Identify mode capabilities. 128 */ 129 if (IEEE80211_IS_CHAN_A(c)) 130 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 131 if (IEEE80211_IS_CHAN_B(c)) 132 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 133 if (IEEE80211_IS_CHAN_PUREG(c)) 134 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 135 if (IEEE80211_IS_CHAN_FHSS(c)) 136 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 137 if (IEEE80211_IS_CHAN_T(c)) 138 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; 139 } 140 } 141 /* validate ic->ic_curmode */ 142 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 143 ic->ic_curmode = IEEE80211_MODE_AUTO; 144 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 145 146 (void) ieee80211_setmode(ic, ic->ic_curmode); 147 148 if (ic->ic_lintval == 0) 149 ic->ic_lintval = 100; /* default sleep */ 150 ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ 151 152 ieee80211_node_attach(ifp); 153 ieee80211_proto_attach(ifp); 154 } 155 156 void 157 ieee80211_ifdetach(struct ifnet *ifp) 158 { 159 struct ieee80211com *ic = (void *)ifp; 160 161 ieee80211_proto_detach(ifp); 162 ieee80211_crypto_detach(ifp); 163 ieee80211_node_detach(ifp); 164 ifmedia_removeall(&ic->ic_media); 165 bpfdetach(ifp); 166 ether_ifdetach(ifp); 167 } 168 169 /* 170 * Convert MHz frequency to IEEE channel number. 171 */ 172 u_int 173 ieee80211_mhz2ieee(u_int freq, u_int flags) 174 { 175 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 176 if (freq == 2484) 177 return 14; 178 if (freq < 2484) 179 return (freq - 2407) / 5; 180 else 181 return 15 + ((freq - 2512) / 20); 182 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ 183 return (freq - 5000) / 5; 184 } else { /* either, guess */ 185 if (freq == 2484) 186 return 14; 187 if (freq < 2484) 188 return (freq - 2407) / 5; 189 if (freq < 5000) 190 return 15 + ((freq - 2512) / 20); 191 return (freq - 5000) / 5; 192 } 193 } 194 195 /* 196 * Convert channel to IEEE channel number. 197 */ 198 u_int 199 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 200 { 201 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 202 return c - ic->ic_channels; 203 else if (c == IEEE80211_CHAN_ANYC) 204 return IEEE80211_CHAN_ANY; 205 else if (c != NULL) { 206 if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", 207 c->ic_freq, c->ic_flags); 208 return 0; /* XXX */ 209 } else { 210 if_printf(&ic->ic_if, "invalid channel (NULL)\n"); 211 return 0; /* XXX */ 212 } 213 } 214 215 /* 216 * Convert IEEE channel number to MHz frequency. 217 */ 218 u_int 219 ieee80211_ieee2mhz(u_int chan, u_int flags) 220 { 221 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 222 if (chan == 14) 223 return 2484; 224 if (chan < 14) 225 return 2407 + chan*5; 226 else 227 return 2512 + ((chan-15)*20); 228 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ 229 return 5000 + (chan*5); 230 } else { /* either, guess */ 231 if (chan == 14) 232 return 2484; 233 if (chan < 14) /* 0-13 */ 234 return 2407 + chan*5; 235 if (chan < 27) /* 15-26 */ 236 return 2512 + ((chan-15)*20); 237 return 5000 + (chan*5); 238 } 239 } 240 241 /* 242 * Setup the media data structures according to the channel and 243 * rate tables. This must be called by the driver after 244 * ieee80211_attach and before most anything else. 245 */ 246 void 247 ieee80211_media_init(struct ifnet *ifp, 248 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 249 { 250 #define ADD(_ic, _s, _o) \ 251 ifmedia_add(&(_ic)->ic_media, \ 252 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 253 struct ieee80211com *ic = (void *)ifp; 254 struct ifmediareq imr; 255 int i, j, mode, rate, maxrate, mword, mopt, r; 256 struct ieee80211_rateset *rs; 257 struct ieee80211_rateset allrates; 258 259 /* 260 * Do late attach work that must wait for any subclass 261 * (i.e. driver) work such as overriding methods. 262 */ 263 ieee80211_node_lateattach(ifp); 264 265 /* 266 * Fill in media characteristics. 267 */ 268 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 269 maxrate = 0; 270 memset(&allrates, 0, sizeof(allrates)); 271 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 272 static const u_int mopts[] = { 273 IFM_AUTO, 274 IFM_IEEE80211_11A, 275 IFM_IEEE80211_11B, 276 IFM_IEEE80211_11G, 277 IFM_IEEE80211_FH, 278 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 279 }; 280 if ((ic->ic_modecaps & (1<<mode)) == 0) 281 continue; 282 mopt = mopts[mode]; 283 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 284 if (ic->ic_caps & IEEE80211_C_IBSS) 285 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 286 if (ic->ic_caps & IEEE80211_C_HOSTAP) 287 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 288 if (ic->ic_caps & IEEE80211_C_AHDEMO) 289 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 290 if (ic->ic_caps & IEEE80211_C_MONITOR) 291 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 292 if (mode == IEEE80211_MODE_AUTO) 293 continue; 294 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); 295 rs = &ic->ic_sup_rates[mode]; 296 for (i = 0; i < rs->rs_nrates; i++) { 297 rate = rs->rs_rates[i]; 298 mword = ieee80211_rate2media(ic, rate, mode); 299 if (mword == 0) 300 continue; 301 printf("%s%d%sMbps", (i != 0 ? " " : ""), 302 (rate & IEEE80211_RATE_VAL) / 2, 303 ((rate & 0x1) != 0 ? ".5" : "")); 304 ADD(ic, mword, mopt); 305 if (ic->ic_caps & IEEE80211_C_IBSS) 306 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 307 if (ic->ic_caps & IEEE80211_C_HOSTAP) 308 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 309 if (ic->ic_caps & IEEE80211_C_AHDEMO) 310 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 311 if (ic->ic_caps & IEEE80211_C_MONITOR) 312 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 313 /* 314 * Add rate to the collection of all rates. 315 */ 316 r = rate & IEEE80211_RATE_VAL; 317 for (j = 0; j < allrates.rs_nrates; j++) 318 if (allrates.rs_rates[j] == r) 319 break; 320 if (j == allrates.rs_nrates) { 321 /* unique, add to the set */ 322 allrates.rs_rates[j] = r; 323 allrates.rs_nrates++; 324 } 325 rate = (rate & IEEE80211_RATE_VAL) / 2; 326 if (rate > maxrate) 327 maxrate = rate; 328 } 329 printf("\n"); 330 } 331 for (i = 0; i < allrates.rs_nrates; i++) { 332 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 333 IEEE80211_MODE_AUTO); 334 if (mword == 0) 335 continue; 336 mword = IFM_SUBTYPE(mword); /* remove media options */ 337 ADD(ic, mword, 0); 338 if (ic->ic_caps & IEEE80211_C_IBSS) 339 ADD(ic, mword, IFM_IEEE80211_ADHOC); 340 if (ic->ic_caps & IEEE80211_C_HOSTAP) 341 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 342 if (ic->ic_caps & IEEE80211_C_AHDEMO) 343 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 344 if (ic->ic_caps & IEEE80211_C_MONITOR) 345 ADD(ic, mword, IFM_IEEE80211_MONITOR); 346 } 347 ieee80211_media_status(ifp, &imr); 348 ifmedia_set(&ic->ic_media, imr.ifm_active); 349 350 if (maxrate) 351 ifp->if_baudrate = IF_Mbps(maxrate); 352 #undef ADD 353 } 354 355 static int 356 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 357 { 358 #define IEEERATE(_ic,_m,_i) \ 359 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 360 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 361 for (i = 0; i < nrates; i++) 362 if (IEEERATE(ic, mode, i) == rate) 363 return i; 364 return -1; 365 #undef IEEERATE 366 } 367 368 /* 369 * Handle a media change request. 370 */ 371 int 372 ieee80211_media_change(struct ifnet *ifp) 373 { 374 struct ieee80211com *ic = (void *)ifp; 375 struct ifmedia_entry *ime; 376 enum ieee80211_opmode newopmode; 377 enum ieee80211_phymode newphymode; 378 int i, j, newrate, error = 0; 379 380 ime = ic->ic_media.ifm_cur; 381 /* 382 * First, identify the phy mode. 383 */ 384 switch (IFM_MODE(ime->ifm_media)) { 385 case IFM_IEEE80211_11A: 386 newphymode = IEEE80211_MODE_11A; 387 break; 388 case IFM_IEEE80211_11B: 389 newphymode = IEEE80211_MODE_11B; 390 break; 391 case IFM_IEEE80211_11G: 392 newphymode = IEEE80211_MODE_11G; 393 break; 394 case IFM_IEEE80211_FH: 395 newphymode = IEEE80211_MODE_FH; 396 break; 397 case IFM_AUTO: 398 newphymode = IEEE80211_MODE_AUTO; 399 break; 400 default: 401 return EINVAL; 402 } 403 /* 404 * Turbo mode is an ``option''. Eventually it 405 * needs to be applied to 11g too. 406 */ 407 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 408 if (newphymode != IEEE80211_MODE_11A) 409 return EINVAL; 410 newphymode = IEEE80211_MODE_TURBO; 411 } 412 /* 413 * Validate requested mode is available. 414 */ 415 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 416 return EINVAL; 417 418 /* 419 * Next, the fixed/variable rate. 420 */ 421 i = -1; 422 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 423 /* 424 * Convert media subtype to rate. 425 */ 426 newrate = ieee80211_media2rate(ime->ifm_media); 427 if (newrate == 0) 428 return EINVAL; 429 /* 430 * Check the rate table for the specified/current phy. 431 */ 432 if (newphymode == IEEE80211_MODE_AUTO) { 433 /* 434 * In autoselect mode search for the rate. 435 */ 436 for (j = IEEE80211_MODE_11A; 437 j < IEEE80211_MODE_MAX; j++) { 438 if ((ic->ic_modecaps & (1<<j)) == 0) 439 continue; 440 i = findrate(ic, j, newrate); 441 if (i != -1) { 442 /* lock mode too */ 443 newphymode = j; 444 break; 445 } 446 } 447 } else { 448 i = findrate(ic, newphymode, newrate); 449 } 450 if (i == -1) /* mode/rate mismatch */ 451 return EINVAL; 452 } 453 /* NB: defer rate setting to later */ 454 455 /* 456 * Deduce new operating mode but don't install it just yet. 457 */ 458 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 459 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 460 newopmode = IEEE80211_M_AHDEMO; 461 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 462 newopmode = IEEE80211_M_HOSTAP; 463 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 464 newopmode = IEEE80211_M_IBSS; 465 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 466 newopmode = IEEE80211_M_MONITOR; 467 else 468 newopmode = IEEE80211_M_STA; 469 470 /* 471 * Autoselect doesn't make sense when operating as an AP. 472 * If no phy mode has been selected, pick one and lock it 473 * down so rate tables can be used in forming beacon frames 474 * and the like. 475 */ 476 if (newopmode == IEEE80211_M_HOSTAP && 477 newphymode == IEEE80211_MODE_AUTO) { 478 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 479 if (ic->ic_modecaps & (1<<j)) { 480 newphymode = j; 481 break; 482 } 483 } 484 485 /* 486 * Handle phy mode change. 487 */ 488 if (ic->ic_curmode != newphymode) { /* change phy mode */ 489 error = ieee80211_setmode(ic, newphymode); 490 if (error != 0) 491 return error; 492 error = ENETRESET; 493 } 494 495 /* 496 * Committed to changes, install the rate setting. 497 */ 498 if (ic->ic_fixed_rate != i) { 499 ic->ic_fixed_rate = i; /* set fixed tx rate */ 500 error = ENETRESET; 501 } 502 503 /* 504 * Handle operating mode change. 505 */ 506 if (ic->ic_opmode != newopmode) { 507 ic->ic_opmode = newopmode; 508 switch (newopmode) { 509 case IEEE80211_M_AHDEMO: 510 case IEEE80211_M_HOSTAP: 511 case IEEE80211_M_STA: 512 case IEEE80211_M_MONITOR: 513 ic->ic_flags &= ~IEEE80211_F_IBSSON; 514 break; 515 case IEEE80211_M_IBSS: 516 ic->ic_flags |= IEEE80211_F_IBSSON; 517 #ifdef notdef 518 if (ic->ic_curmode == IEEE80211_MODE_11G) 519 ieee80211_set11gbasicrates( 520 &ic->ic_suprates[newphymode], 521 IEEE80211_MODE_11B); 522 #endif 523 break; 524 } 525 error = ENETRESET; 526 } 527 #ifdef notdef 528 if (error == 0) 529 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 530 #endif 531 return error; 532 } 533 534 void 535 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 536 { 537 struct ieee80211com *ic = (void *)ifp; 538 struct ieee80211_node *ni = NULL; 539 int old_status = imr->ifm_status; 540 541 imr->ifm_status = IFM_AVALID; 542 imr->ifm_active = IFM_IEEE80211; 543 if (ic->ic_state == IEEE80211_S_RUN) { 544 imr->ifm_status |= IFM_ACTIVE; 545 ifp->if_link_state = LINK_STATE_UP; 546 } else 547 ifp->if_link_state = LINK_STATE_DOWN; 548 imr->ifm_active |= IFM_AUTO; 549 switch (ic->ic_opmode) { 550 case IEEE80211_M_STA: 551 ni = ic->ic_bss; 552 /* calculate rate subtype */ 553 imr->ifm_active |= ieee80211_rate2media(ic, 554 ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode); 555 break; 556 case IEEE80211_M_IBSS: 557 imr->ifm_active |= IFM_IEEE80211_ADHOC; 558 break; 559 case IEEE80211_M_AHDEMO: 560 /* should not come here */ 561 break; 562 case IEEE80211_M_HOSTAP: 563 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 564 break; 565 case IEEE80211_M_MONITOR: 566 imr->ifm_active |= IFM_IEEE80211_MONITOR; 567 break; 568 } 569 switch (ic->ic_curmode) { 570 case IEEE80211_MODE_11A: 571 imr->ifm_active |= IFM_IEEE80211_11A; 572 break; 573 case IEEE80211_MODE_11B: 574 imr->ifm_active |= IFM_IEEE80211_11B; 575 break; 576 case IEEE80211_MODE_11G: 577 imr->ifm_active |= IFM_IEEE80211_11G; 578 break; 579 case IEEE80211_MODE_FH: 580 imr->ifm_active |= IFM_IEEE80211_FH; 581 break; 582 case IEEE80211_MODE_TURBO: 583 imr->ifm_active |= IFM_IEEE80211_11A 584 | IFM_IEEE80211_TURBO; 585 break; 586 } 587 588 /* Notify that the link state has changed. */ 589 if (imr->ifm_status != old_status) 590 rt_ifmsg(ifp); 591 } 592 593 void 594 ieee80211_watchdog(struct ifnet *ifp) 595 { 596 struct ieee80211com *ic = (void *)ifp; 597 598 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 599 ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); 600 if (ic->ic_inact_timer && --ic->ic_inact_timer == 0) 601 ieee80211_timeout_nodes(ic); 602 603 if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0) 604 ifp->if_timer = 1; 605 } 606 607 /* 608 * Mark the basic rates for the 11g rate table based on the 609 * operating mode. For real 11g we mark all the 11b rates 610 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only 611 * 11b rates. There's also a pseudo 11a-mode used to mark only 612 * the basic OFDM rates. 613 */ 614 static void 615 ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode) 616 { 617 static const struct ieee80211_rateset basic[] = { 618 { 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */ 619 { 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */ 620 { 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */ 621 { 0 }, /* IEEE80211_MODE_FH */ 622 { 0 }, /* IEEE80211_MODE_TURBO */ 623 }; 624 int i, j; 625 626 for (i = 0; i < rs->rs_nrates; i++) { 627 rs->rs_rates[i] &= IEEE80211_RATE_VAL; 628 for (j = 0; j < basic[mode].rs_nrates; j++) 629 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) { 630 rs->rs_rates[i] |= IEEE80211_RATE_BASIC; 631 break; 632 } 633 } 634 } 635 636 /* 637 * Set the current phy mode and recalculate the active channel 638 * set based on the available channels for this mode. Also 639 * select a new default/current channel if the current one is 640 * inappropriate for this mode. 641 */ 642 int 643 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 644 { 645 #define N(a) (sizeof(a) / sizeof(a[0])) 646 static const u_int chanflags[] = { 647 0, /* IEEE80211_MODE_AUTO */ 648 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 649 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 650 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 651 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 652 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */ 653 }; 654 struct ieee80211_channel *c; 655 u_int modeflags; 656 int i; 657 658 /* validate new mode */ 659 if ((ic->ic_modecaps & (1<<mode)) == 0) { 660 IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n", 661 __func__, mode, ic->ic_modecaps)); 662 return EINVAL; 663 } 664 665 /* 666 * Verify at least one channel is present in the available 667 * channel list before committing to the new mode. 668 */ 669 KASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 670 modeflags = chanflags[mode]; 671 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 672 c = &ic->ic_channels[i]; 673 if (mode == IEEE80211_MODE_AUTO) { 674 /* ignore turbo channels for autoselect */ 675 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 676 break; 677 } else { 678 if ((c->ic_flags & modeflags) == modeflags) 679 break; 680 } 681 } 682 if (i > IEEE80211_CHAN_MAX) { 683 IEEE80211_DPRINTF(("%s: no channels found for mode %u\n", 684 __func__, mode)); 685 return EINVAL; 686 } 687 688 /* 689 * Calculate the active channel set. 690 */ 691 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 692 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 693 c = &ic->ic_channels[i]; 694 if (mode == IEEE80211_MODE_AUTO) { 695 /* take anything but pure turbo channels */ 696 if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0) 697 setbit(ic->ic_chan_active, i); 698 } else { 699 if ((c->ic_flags & modeflags) == modeflags) 700 setbit(ic->ic_chan_active, i); 701 } 702 } 703 /* 704 * If no current/default channel is setup or the current 705 * channel is wrong for the mode then pick the first 706 * available channel from the active list. This is likely 707 * not the right one. 708 */ 709 if (ic->ic_ibss_chan == NULL || 710 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 711 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 712 if (isset(ic->ic_chan_active, i)) { 713 ic->ic_ibss_chan = &ic->ic_channels[i]; 714 break; 715 } 716 } 717 718 /* 719 * Set/reset state flags that influence beacon contents, etc. 720 * 721 * XXX what if we have stations already associated??? 722 * XXX probably not right for autoselect? 723 */ 724 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) 725 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 726 if (mode == IEEE80211_MODE_11G) { 727 if (ic->ic_caps & IEEE80211_C_SHSLOT) 728 ic->ic_flags |= IEEE80211_F_SHSLOT; 729 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 730 IEEE80211_MODE_11G); 731 } else { 732 ic->ic_flags &= ~IEEE80211_F_SHSLOT; 733 } 734 735 ic->ic_curmode = mode; 736 return 0; 737 #undef N 738 } 739 740 /* 741 * Return the phy mode for with the specified channel so the 742 * caller can select a rate set. This is problematic and the 743 * work here assumes how things work elsewhere in this code. 744 */ 745 enum ieee80211_phymode 746 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 747 { 748 /* 749 * NB: this assumes the channel would not be supplied to us 750 * unless it was already compatible with the current mode. 751 */ 752 if (ic->ic_curmode != IEEE80211_MODE_AUTO) 753 return ic->ic_curmode; 754 /* 755 * In autoselect mode; deduce a mode based on the channel 756 * characteristics. We assume that turbo-only channels 757 * are not considered when the channel set is constructed. 758 */ 759 if (IEEE80211_IS_CHAN_5GHZ(chan)) 760 return IEEE80211_MODE_11A; 761 else if (IEEE80211_IS_CHAN_FHSS(chan)) 762 return IEEE80211_MODE_FH; 763 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) 764 return IEEE80211_MODE_11G; 765 else 766 return IEEE80211_MODE_11B; 767 } 768 769 /* 770 * convert IEEE80211 rate value to ifmedia subtype. 771 * ieee80211 rate is in unit of 0.5Mbps. 772 */ 773 int 774 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 775 { 776 #define N(a) (sizeof(a) / sizeof(a[0])) 777 static const struct { 778 u_int m; /* rate + mode */ 779 u_int r; /* if_media rate */ 780 } rates[] = { 781 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 782 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 783 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 784 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 785 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 786 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 787 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 788 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 789 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 790 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 791 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 792 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 793 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 794 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 795 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 796 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 797 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 798 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 799 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 800 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 801 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 802 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 803 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 804 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 805 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 806 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 807 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 808 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 809 }; 810 u_int mask, i; 811 812 mask = rate & IEEE80211_RATE_VAL; 813 switch (mode) { 814 case IEEE80211_MODE_11A: 815 case IEEE80211_MODE_TURBO: 816 mask |= IFM_IEEE80211_11A; 817 break; 818 case IEEE80211_MODE_11B: 819 mask |= IFM_IEEE80211_11B; 820 break; 821 case IEEE80211_MODE_FH: 822 mask |= IFM_IEEE80211_FH; 823 break; 824 case IEEE80211_MODE_AUTO: 825 /* NB: ic may be NULL for some drivers */ 826 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 827 mask |= IFM_IEEE80211_FH; 828 break; 829 } 830 /* NB: hack, 11g matches both 11b+11a rates */ 831 /* fall thru... */ 832 case IEEE80211_MODE_11G: 833 mask |= IFM_IEEE80211_11G; 834 break; 835 } 836 for (i = 0; i < N(rates); i++) 837 if (rates[i].m == mask) 838 return rates[i].r; 839 return IFM_AUTO; 840 #undef N 841 } 842 843 int 844 ieee80211_media2rate(int mword) 845 { 846 #define N(a) (sizeof(a) / sizeof(a[0])) 847 static const int ieeerates[] = { 848 -1, /* IFM_AUTO */ 849 0, /* IFM_MANUAL */ 850 0, /* IFM_NONE */ 851 2, /* IFM_IEEE80211_FH1 */ 852 4, /* IFM_IEEE80211_FH2 */ 853 2, /* IFM_IEEE80211_DS1 */ 854 4, /* IFM_IEEE80211_DS2 */ 855 11, /* IFM_IEEE80211_DS5 */ 856 22, /* IFM_IEEE80211_DS11 */ 857 44, /* IFM_IEEE80211_DS22 */ 858 12, /* IFM_IEEE80211_OFDM6 */ 859 18, /* IFM_IEEE80211_OFDM9 */ 860 24, /* IFM_IEEE80211_OFDM12 */ 861 36, /* IFM_IEEE80211_OFDM18 */ 862 48, /* IFM_IEEE80211_OFDM24 */ 863 72, /* IFM_IEEE80211_OFDM36 */ 864 96, /* IFM_IEEE80211_OFDM48 */ 865 108, /* IFM_IEEE80211_OFDM54 */ 866 144, /* IFM_IEEE80211_OFDM72 */ 867 }; 868 return IFM_SUBTYPE(mword) < N(ieeerates) ? 869 ieeerates[IFM_SUBTYPE(mword)] : 0; 870 #undef N 871 } 872 873 /* 874 * Module glue. 875 * 876 * NB: the module name is "wlan" for compatibility with NetBSD. 877 */ 878 879 static int 880 ieee80211_modevent(module_t mod, int type, void *unused) 881 { 882 switch (type) { 883 case MOD_LOAD: 884 if (bootverbose) 885 printf("wlan: <802.11 Link Layer>\n"); 886 return 0; 887 case MOD_UNLOAD: 888 return 0; 889 } 890 return EINVAL; 891 } 892 893 static moduledata_t ieee80211_mod = { 894 "wlan", 895 ieee80211_modevent, 896 0 897 }; 898 DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 899 MODULE_VERSION(wlan, 1); 900 MODULE_DEPEND(wlan, rc4, 1, 1, 1); 901 MODULE_DEPEND(wlan, ether, 1, 1, 1); 902