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sys/net80211/ieee80211.c
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1 /* $NetBSD: ieee80211.c,v 1.61 2021/08/21 11:55:25 andvar 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 1.61 2021/08/21 11:55:25 andvar Exp $"); 40 #endif 41 42 /* 43 * IEEE 802.11 generic handler 44 */ 45 46 #ifdef _KERNEL_OPT 47 #include "opt_inet.h" 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/kernel.h> 53 54 #include <sys/socket.h> 55 #include <sys/sockio.h> 56 #include <sys/endian.h> 57 #include <sys/errno.h> 58 #include <sys/proc.h> 59 #include <sys/sysctl.h> 60 61 #include <net/if.h> 62 #include <net/if_media.h> 63 #include <net/if_arp.h> 64 #include <net/if_ether.h> 65 #include <net/if_llc.h> 66 67 #include <net80211/ieee80211_netbsd.h> 68 #include <net80211/ieee80211_var.h> 69 #include <net80211/ieee80211_sysctl.h> 70 71 #include <net/bpf.h> 72 73 #ifdef INET 74 #include <netinet/in.h> 75 #include <net/if_ether.h> 76 #endif 77 78 const struct ieee80211_channel ieee80211_channel_anyc = { 79 0, 0 80 }; 81 82 struct ieee80211com_head ieee80211com_head = 83 LIST_HEAD_INITIALIZER(ieee80211com_head); 84 85 const char *ieee80211_phymode_name[] = { 86 "auto", /* IEEE80211_MODE_AUTO */ 87 "11a", /* IEEE80211_MODE_11A */ 88 "11b", /* IEEE80211_MODE_11B */ 89 "11g", /* IEEE80211_MODE_11G */ 90 "FH", /* IEEE80211_MODE_FH */ 91 "turboA", /* IEEE80211_MODE_TURBO_A */ 92 "turboG", /* IEEE80211_MODE_TURBO_G */ 93 }; 94 95 /* list of all instances */ 96 SLIST_HEAD(ieee80211_list, ieee80211com); 97 static struct ieee80211_list ieee80211_list = 98 SLIST_HEAD_INITIALIZER(ieee80211_list); 99 static u_int8_t ieee80211_vapmap[32]; /* enough for 256 */ 100 101 static void 102 ieee80211_add_vap(struct ieee80211com *ic) 103 { 104 #define N(a) (sizeof(a)/sizeof(a[0])) 105 int i; 106 int s; 107 u_int8_t b; 108 109 s = splnet(); 110 ic->ic_vap = 0; 111 for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) 112 ic->ic_vap += NBBY; 113 if (i == N(ieee80211_vapmap)) 114 panic("vap table full"); 115 for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) 116 ic->ic_vap++; 117 setbit(ieee80211_vapmap, ic->ic_vap); 118 SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); 119 splx(s); 120 #undef N 121 } 122 123 static void 124 ieee80211_remove_vap(struct ieee80211com *ic) 125 { 126 int s; 127 128 s = splnet(); 129 SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); 130 IASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, 131 ("invalid vap id %d", ic->ic_vap)); 132 IASSERT(isset(ieee80211_vapmap, ic->ic_vap), 133 ("vap id %d not allocated", ic->ic_vap)); 134 clrbit(ieee80211_vapmap, ic->ic_vap); 135 splx(s); 136 } 137 138 /* 139 * Default reset method for use with the ioctl support. This 140 * method is invoked after any state change in the 802.11 141 * layer that should be propagated to the hardware but not 142 * require re-initialization of the 802.11 state machine (e.g 143 * rescanning for an ap). We always return ENETRESET which 144 * should cause the driver to re-initialize the device. Drivers 145 * can override this method to implement more optimized support. 146 */ 147 static int 148 ieee80211_default_reset(struct ifnet *ifp) 149 { 150 return ENETRESET; 151 } 152 153 static void 154 ieee80211_init_link_state(struct ieee80211com *ic) 155 { 156 struct ifnet *ifp = ic->ic_ifp; 157 158 /* 159 * Link state does not make sense in IBSS or HOSTAP modes. 160 * We know that the link in MONITOR mode is DOWN as we cannot 161 * transmit, only monitor. 162 * That leaves BSS mode, which starts off DOWN and will 163 * transition to UP when it joins a node. 164 */ 165 switch (ic->ic_opmode) { 166 case IEEE80211_M_AHDEMO: 167 case IEEE80211_M_HOSTAP: 168 case IEEE80211_M_IBSS: 169 if_link_state_change(ifp, LINK_STATE_UNKNOWN); 170 break; 171 default: 172 if_link_state_change(ifp, LINK_STATE_DOWN); 173 break; 174 } 175 } 176 177 void 178 ieee80211_ifattach(struct ieee80211com *ic) 179 { 180 struct ifnet *ifp = ic->ic_ifp; 181 struct ieee80211_channel *c; 182 int i; 183 184 #ifdef __NetBSD__ 185 ieee80211_init(); 186 #endif /* __NetBSD__ */ 187 188 ether_ifattach(ifp, ic->ic_myaddr); 189 bpf_attach2(ifp, DLT_IEEE802_11, 190 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 191 192 ieee80211_crypto_attach(ic); 193 194 /* 195 * Fill in 802.11 available channel set, mark 196 * all available channels as active, and pick 197 * a default channel if not already specified. 198 */ 199 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 200 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 201 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 202 c = &ic->ic_channels[i]; 203 if (c->ic_flags) { 204 /* 205 * Verify driver passed us valid data. 206 */ 207 if (i != ieee80211_chan2ieee(ic, c)) { 208 if_printf(ifp, "bad channel ignored; " 209 "freq %u flags %x number %u\n", 210 c->ic_freq, c->ic_flags, i); 211 c->ic_flags = 0; /* NB: remove */ 212 continue; 213 } 214 setbit(ic->ic_chan_avail, i); 215 /* 216 * Identify mode capabilities. 217 */ 218 if (IEEE80211_IS_CHAN_A(c)) 219 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 220 if (IEEE80211_IS_CHAN_B(c)) 221 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 222 if (IEEE80211_IS_CHAN_PUREG(c)) 223 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 224 if (IEEE80211_IS_CHAN_FHSS(c)) 225 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 226 if (IEEE80211_IS_CHAN_T(c)) 227 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 228 if (IEEE80211_IS_CHAN_108G(c)) 229 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 230 if (ic->ic_curchan == NULL) { 231 /* arbitrarily pick the first channel */ 232 ic->ic_curchan = &ic->ic_channels[i]; 233 } 234 } 235 } 236 /* validate ic->ic_curmode */ 237 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 238 ic->ic_curmode = IEEE80211_MODE_AUTO; 239 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 240 #if 0 241 /* 242 * Enable WME by default if we're capable. 243 */ 244 if (ic->ic_caps & IEEE80211_C_WME) 245 ic->ic_flags |= IEEE80211_F_WME; 246 #endif 247 (void) ieee80211_setmode(ic, ic->ic_curmode); 248 249 if (ic->ic_bintval == 0) 250 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 251 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 252 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 253 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 254 255 if (ic->ic_lintval == 0) 256 ic->ic_lintval = ic->ic_bintval; 257 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 258 259 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 260 ieee80211_node_attach(ic); 261 ieee80211_proto_attach(ic); 262 263 ieee80211_add_vap(ic); 264 265 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 266 267 /* 268 * Install a default reset method for the ioctl support. 269 * The driver is expected to fill this in before calling us. 270 */ 271 if (ic->ic_reset == NULL) 272 ic->ic_reset = ieee80211_default_reset; 273 274 ieee80211_init_link_state(ic); 275 } 276 277 void 278 ieee80211_ifdetach(struct ieee80211com *ic) 279 { 280 struct ifnet *ifp = ic->ic_ifp; 281 282 ieee80211_remove_vap(ic); 283 284 ieee80211_sysctl_detach(ic); 285 ieee80211_proto_detach(ic); 286 ieee80211_crypto_detach(ic); 287 ieee80211_node_detach(ic); 288 LIST_REMOVE(ic, ic_list); 289 ifmedia_fini(&ic->ic_media); 290 291 IEEE80211_BEACON_LOCK_DESTROY(ic); 292 293 bpf_detach(ifp); 294 ether_ifdetach(ifp); 295 } 296 297 /* 298 * Convert MHz frequency to IEEE channel number. 299 */ 300 u_int 301 ieee80211_mhz2ieee(u_int freq, u_int flags) 302 { 303 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 304 if (freq == 2484) 305 return 14; 306 if (freq < 2484) 307 return (freq - 2407) / 5; 308 else 309 return 15 + ((freq - 2512) / 20); 310 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5 GHz band */ 311 return (freq - 5000) / 5; 312 } else { /* either, guess */ 313 if (freq == 2484) 314 return 14; 315 if (freq < 2484) 316 return (freq - 2407) / 5; 317 if (freq < 5000) 318 return 15 + ((freq - 2512) / 20); 319 return (freq - 5000) / 5; 320 } 321 } 322 323 /* 324 * Convert channel to IEEE channel number. 325 */ 326 u_int 327 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 328 { 329 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 330 return c - ic->ic_channels; 331 else if (c == IEEE80211_CHAN_ANYC) 332 return IEEE80211_CHAN_ANY; 333 else if (c != NULL) { 334 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 335 c->ic_freq, c->ic_flags); 336 return 0; /* XXX */ 337 } else { 338 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 339 return 0; /* XXX */ 340 } 341 } 342 343 /* 344 * Convert IEEE channel number to MHz frequency. 345 */ 346 u_int 347 ieee80211_ieee2mhz(u_int chan, u_int flags) 348 { 349 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 350 if (chan == 14) 351 return 2484; 352 if (chan < 14) 353 return 2407 + chan*5; 354 else 355 return 2512 + ((chan-15)*20); 356 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5 GHz band */ 357 return 5000 + (chan*5); 358 } else { /* either, guess */ 359 if (chan == 14) 360 return 2484; 361 if (chan < 14) /* 0-13 */ 362 return 2407 + chan*5; 363 if (chan < 27) /* 15-26 */ 364 return 2512 + ((chan-15)*20); 365 return 5000 + (chan*5); 366 } 367 } 368 369 /* 370 * Setup the media data structures according to the channel and 371 * rate tables. This must be called by the driver after 372 * ieee80211_attach and before most anything else. 373 */ 374 void 375 ieee80211_media_init_with_lock(struct ieee80211com *ic, 376 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat, 377 ieee80211_media_lock_t *lock) 378 { 379 #define ADD(_ic, _s, _o) \ 380 ifmedia_add(&(_ic)->ic_media, \ 381 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 382 struct ifnet *ifp = ic->ic_ifp; 383 struct ifmediareq imr; 384 int i, j, mode, rate, maxrate, mword, mopt, r; 385 const struct ieee80211_rateset *rs; 386 struct ieee80211_rateset allrates; 387 388 /* 389 * Do late attach work that must wait for any subclass 390 * (i.e. driver) work such as overriding methods. 391 */ 392 ieee80211_node_lateattach(ic); 393 394 #ifdef IEEE80211_NO_HOSTAP 395 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 396 #endif /* IEEE80211_NO_HOSTAP */ 397 398 /* 399 * Fill in media characteristics. 400 */ 401 ifmedia_init_with_lock(&ic->ic_media, 0, 402 media_change, media_stat, lock); 403 maxrate = 0; 404 memset(&allrates, 0, sizeof(allrates)); 405 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 406 static const u_int mopts[] = { 407 IFM_AUTO, 408 IFM_IEEE80211_11A, 409 IFM_IEEE80211_11B, 410 IFM_IEEE80211_11G, 411 IFM_IEEE80211_FH, 412 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 413 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 414 }; 415 if ((ic->ic_modecaps & (1<<mode)) == 0) 416 continue; 417 mopt = mopts[mode]; 418 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 419 if (ic->ic_caps & IEEE80211_C_IBSS) 420 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 421 if (ic->ic_caps & IEEE80211_C_HOSTAP) 422 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 423 if (ic->ic_caps & IEEE80211_C_AHDEMO) 424 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 425 if (ic->ic_caps & IEEE80211_C_MONITOR) 426 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 427 if (mode == IEEE80211_MODE_AUTO) 428 continue; 429 rs = &ic->ic_sup_rates[mode]; 430 for (i = 0; i < rs->rs_nrates; i++) { 431 rate = rs->rs_rates[i]; 432 mword = ieee80211_rate2media(ic, rate, mode); 433 if (mword == 0) 434 continue; 435 ADD(ic, mword, mopt); 436 if (ic->ic_caps & IEEE80211_C_IBSS) 437 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 438 if (ic->ic_caps & IEEE80211_C_HOSTAP) 439 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 440 if (ic->ic_caps & IEEE80211_C_AHDEMO) 441 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 442 if (ic->ic_caps & IEEE80211_C_MONITOR) 443 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 444 /* 445 * Add rate to the collection of all rates. 446 */ 447 r = rate & IEEE80211_RATE_VAL; 448 for (j = 0; j < allrates.rs_nrates; j++) 449 if (allrates.rs_rates[j] == r) 450 break; 451 if (j == allrates.rs_nrates) { 452 /* unique, add to the set */ 453 allrates.rs_rates[j] = r; 454 allrates.rs_nrates++; 455 } 456 rate = (rate & IEEE80211_RATE_VAL) / 2; 457 if (rate > maxrate) 458 maxrate = rate; 459 } 460 } 461 for (i = 0; i < allrates.rs_nrates; i++) { 462 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 463 IEEE80211_MODE_AUTO); 464 if (mword == 0) 465 continue; 466 mword = IFM_SUBTYPE(mword); /* remove media options */ 467 ADD(ic, mword, 0); 468 if (ic->ic_caps & IEEE80211_C_IBSS) 469 ADD(ic, mword, IFM_IEEE80211_ADHOC); 470 if (ic->ic_caps & IEEE80211_C_HOSTAP) 471 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 472 if (ic->ic_caps & IEEE80211_C_AHDEMO) 473 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 474 if (ic->ic_caps & IEEE80211_C_MONITOR) 475 ADD(ic, mword, IFM_IEEE80211_MONITOR); 476 } 477 ieee80211_media_status(ifp, &imr); 478 ifmedia_set(&ic->ic_media, imr.ifm_active); 479 480 if (maxrate) 481 ifp->if_baudrate = IF_Mbps(maxrate); 482 #undef ADD 483 } 484 485 void 486 ieee80211_media_init(struct ieee80211com *ic, 487 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 488 { 489 490 ieee80211_media_init_with_lock(ic, media_change, media_stat, NULL); 491 } 492 493 void 494 ieee80211_announce(struct ieee80211com *ic) 495 { 496 struct ifnet *ifp = ic->ic_ifp; 497 int i, mode, rate, mword; 498 struct ieee80211_rateset *rs; 499 500 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 501 if ((ic->ic_modecaps & (1<<mode)) == 0) 502 continue; 503 aprint_debug("%s: %s rates: ", ifp->if_xname, 504 ieee80211_phymode_name[mode]); 505 rs = &ic->ic_sup_rates[mode]; 506 for (i = 0; i < rs->rs_nrates; i++) { 507 rate = rs->rs_rates[i]; 508 mword = ieee80211_rate2media(ic, rate, mode); 509 if (mword == 0) 510 continue; 511 aprint_debug("%s%d%sMbps", (i != 0 ? " " : ""), 512 (rate & IEEE80211_RATE_VAL) / 2, 513 ((rate & 0x1) != 0 ? ".5" : "")); 514 } 515 aprint_debug("\n"); 516 } 517 } 518 519 static int 520 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 521 { 522 #define IEEERATE(_ic,_m,_i) \ 523 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 524 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 525 for (i = 0; i < nrates; i++) 526 if (IEEERATE(ic, mode, i) == rate) 527 return i; 528 return -1; 529 #undef IEEERATE 530 } 531 532 /* 533 * Find an instance by its mac address. 534 */ 535 struct ieee80211com * 536 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 537 { 538 int s; 539 struct ieee80211com *ic; 540 541 s = splnet(); 542 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 543 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 544 break; 545 splx(s); 546 return ic; 547 } 548 549 static struct ieee80211com * 550 ieee80211_find_instance(struct ifnet *ifp) 551 { 552 int s; 553 struct ieee80211com *ic; 554 555 s = splnet(); 556 /* XXX not right for multiple instances but works for now */ 557 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 558 if (ic->ic_ifp == ifp) 559 break; 560 splx(s); 561 return ic; 562 } 563 564 /* 565 * Handle a media change request. 566 */ 567 int 568 ieee80211_media_change(struct ifnet *ifp) 569 { 570 struct ieee80211com *ic; 571 struct ifmedia_entry *ime; 572 enum ieee80211_opmode newopmode; 573 enum ieee80211_phymode newphymode; 574 int i, j, newrate, error = 0; 575 576 ic = ieee80211_find_instance(ifp); 577 if (!ic) { 578 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 579 return EINVAL; 580 } 581 ime = ic->ic_media.ifm_cur; 582 /* 583 * First, identify the phy mode. 584 */ 585 switch (IFM_MODE(ime->ifm_media)) { 586 case IFM_IEEE80211_11A: 587 newphymode = IEEE80211_MODE_11A; 588 break; 589 case IFM_IEEE80211_11B: 590 newphymode = IEEE80211_MODE_11B; 591 break; 592 case IFM_IEEE80211_11G: 593 newphymode = IEEE80211_MODE_11G; 594 break; 595 case IFM_IEEE80211_FH: 596 newphymode = IEEE80211_MODE_FH; 597 break; 598 case IFM_AUTO: 599 newphymode = IEEE80211_MODE_AUTO; 600 break; 601 default: 602 return EINVAL; 603 } 604 /* 605 * Turbo mode is an ``option''. 606 * XXX does not apply to AUTO 607 */ 608 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 609 if (newphymode == IEEE80211_MODE_11A) 610 newphymode = IEEE80211_MODE_TURBO_A; 611 else if (newphymode == IEEE80211_MODE_11G) 612 newphymode = IEEE80211_MODE_TURBO_G; 613 else 614 return EINVAL; 615 } 616 /* 617 * Validate requested mode is available. 618 */ 619 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 620 return EINVAL; 621 622 /* 623 * Next, the fixed/variable rate. 624 */ 625 i = -1; 626 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 627 /* 628 * Convert media subtype to rate. 629 */ 630 newrate = ieee80211_media2rate(ime->ifm_media); 631 if (newrate == 0) 632 return EINVAL; 633 /* 634 * Check the rate table for the specified/current phy. 635 */ 636 if (newphymode == IEEE80211_MODE_AUTO) { 637 /* 638 * In autoselect mode search for the rate. 639 */ 640 for (j = IEEE80211_MODE_11A; 641 j < IEEE80211_MODE_MAX; j++) { 642 if ((ic->ic_modecaps & (1<<j)) == 0) 643 continue; 644 i = findrate(ic, j, newrate); 645 if (i != -1) { 646 /* lock mode too */ 647 newphymode = j; 648 break; 649 } 650 } 651 } else { 652 i = findrate(ic, newphymode, newrate); 653 } 654 if (i == -1) /* mode/rate mismatch */ 655 return EINVAL; 656 } 657 /* NB: defer rate setting to later */ 658 659 /* 660 * Deduce new operating mode but don't install it just yet. 661 */ 662 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 663 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 664 newopmode = IEEE80211_M_AHDEMO; 665 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 666 newopmode = IEEE80211_M_HOSTAP; 667 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 668 newopmode = IEEE80211_M_IBSS; 669 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 670 newopmode = IEEE80211_M_MONITOR; 671 else 672 newopmode = IEEE80211_M_STA; 673 674 #ifndef IEEE80211_NO_HOSTAP 675 /* 676 * Autoselect doesn't make sense when operating as an AP. 677 * If no phy mode has been selected, pick one and lock it 678 * down so rate tables can be used in forming beacon frames 679 * and the like. 680 */ 681 if (newopmode == IEEE80211_M_HOSTAP && 682 newphymode == IEEE80211_MODE_AUTO) { 683 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 684 if (ic->ic_modecaps & (1<<j)) { 685 newphymode = j; 686 break; 687 } 688 } 689 #endif /* !IEEE80211_NO_HOSTAP */ 690 691 /* 692 * Handle phy mode change. 693 */ 694 if (ic->ic_curmode != newphymode) { /* change phy mode */ 695 error = ieee80211_setmode(ic, newphymode); 696 if (error != 0) 697 return error; 698 error = ENETRESET; 699 } 700 701 /* 702 * Committed to changes, install the rate setting. 703 */ 704 if (ic->ic_fixed_rate != i) { 705 ic->ic_fixed_rate = i; /* set fixed tx rate */ 706 error = ENETRESET; 707 } 708 709 /* 710 * Handle operating mode change. 711 */ 712 if (ic->ic_opmode != newopmode) { 713 ic->ic_opmode = newopmode; 714 switch (newopmode) { 715 case IEEE80211_M_AHDEMO: 716 case IEEE80211_M_HOSTAP: 717 case IEEE80211_M_STA: 718 case IEEE80211_M_MONITOR: 719 ic->ic_flags &= ~IEEE80211_F_IBSSON; 720 break; 721 case IEEE80211_M_IBSS: 722 ic->ic_flags |= IEEE80211_F_IBSSON; 723 break; 724 } 725 /* 726 * Yech, slot time may change depending on the 727 * operating mode so reset it to be sure everything 728 * is setup appropriately. 729 */ 730 ieee80211_reset_erp(ic); 731 ieee80211_wme_initparams(ic); /* after opmode change */ 732 ieee80211_init_link_state(ic); /* after opmode change */ 733 error = ENETRESET; 734 } 735 #ifdef notdef 736 if (error == 0) 737 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 738 #endif 739 return error; 740 } 741 742 void 743 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 744 { 745 struct ieee80211com *ic; 746 struct ieee80211_rateset *rs; 747 748 ic = ieee80211_find_instance(ifp); 749 if (!ic) { 750 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 751 return; 752 } 753 imr->ifm_status = IFM_AVALID; 754 imr->ifm_active = IFM_IEEE80211; 755 if (ic->ic_state == IEEE80211_S_RUN) 756 imr->ifm_status |= IFM_ACTIVE; 757 /* 758 * Calculate a current rate if possible. 759 */ 760 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 761 /* 762 * A fixed rate is set, report that. 763 */ 764 rs = &ic->ic_sup_rates[ic->ic_curmode]; 765 imr->ifm_active |= ieee80211_rate2media(ic, 766 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 767 } else if (ic->ic_opmode == IEEE80211_M_STA) { 768 /* 769 * In station mode report the current transmit rate. 770 */ 771 rs = &ic->ic_bss->ni_rates; 772 imr->ifm_active |= ieee80211_rate2media(ic, 773 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 774 } else 775 imr->ifm_active |= IFM_AUTO; 776 switch (ic->ic_opmode) { 777 case IEEE80211_M_STA: 778 break; 779 case IEEE80211_M_IBSS: 780 imr->ifm_active |= IFM_IEEE80211_ADHOC; 781 break; 782 case IEEE80211_M_AHDEMO: 783 /* should not come here */ 784 break; 785 case IEEE80211_M_HOSTAP: 786 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 787 break; 788 case IEEE80211_M_MONITOR: 789 imr->ifm_active |= IFM_IEEE80211_MONITOR; 790 break; 791 } 792 switch (ic->ic_curmode) { 793 case IEEE80211_MODE_11A: 794 imr->ifm_active |= IFM_IEEE80211_11A; 795 break; 796 case IEEE80211_MODE_11B: 797 imr->ifm_active |= IFM_IEEE80211_11B; 798 break; 799 case IEEE80211_MODE_11G: 800 imr->ifm_active |= IFM_IEEE80211_11G; 801 break; 802 case IEEE80211_MODE_FH: 803 imr->ifm_active |= IFM_IEEE80211_FH; 804 break; 805 case IEEE80211_MODE_TURBO_A: 806 imr->ifm_active |= IFM_IEEE80211_11A 807 | IFM_IEEE80211_TURBO; 808 break; 809 case IEEE80211_MODE_TURBO_G: 810 imr->ifm_active |= IFM_IEEE80211_11G 811 | IFM_IEEE80211_TURBO; 812 break; 813 } 814 } 815 816 void 817 ieee80211_watchdog(struct ieee80211com *ic) 818 { 819 struct ieee80211_node_table *nt; 820 int need_inact_timer = 0; 821 822 if (ic->ic_state != IEEE80211_S_INIT) { 823 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 824 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 825 nt = &ic->ic_scan; 826 if (nt->nt_inact_timer) { 827 if (--nt->nt_inact_timer == 0) 828 nt->nt_timeout(nt); 829 need_inact_timer += nt->nt_inact_timer; 830 } 831 nt = &ic->ic_sta; 832 if (nt->nt_inact_timer) { 833 if (--nt->nt_inact_timer == 0) 834 nt->nt_timeout(nt); 835 need_inact_timer += nt->nt_inact_timer; 836 } 837 } 838 if (ic->ic_mgt_timer != 0 || need_inact_timer) 839 ic->ic_ifp->if_timer = 1; 840 } 841 842 const struct ieee80211_rateset ieee80211_std_rateset_11a = 843 { 8, { 12, 18, 24, 36, 48, 72, 96, 108 } }; 844 845 const struct ieee80211_rateset ieee80211_std_rateset_11b = 846 { 4, { 2, 4, 11, 22 } }; 847 848 const struct ieee80211_rateset ieee80211_std_rateset_11g = 849 { 12, { 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 } }; 850 851 /* 852 * Set the current phy mode and recalculate the active channel 853 * set based on the available channels for this mode. Also 854 * select a new default/current channel if the current one is 855 * inappropriate for this mode. 856 */ 857 int 858 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 859 { 860 #define N(a) (sizeof(a) / sizeof(a[0])) 861 static const u_int chanflags[] = { 862 0, /* IEEE80211_MODE_AUTO */ 863 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 864 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 865 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 866 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 867 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 868 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 869 }; 870 struct ieee80211_channel *c; 871 u_int modeflags; 872 int i; 873 874 /* validate new mode */ 875 if ((ic->ic_modecaps & (1<<mode)) == 0) { 876 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 877 "%s: mode %u not supported (caps 0x%x)\n", 878 __func__, mode, ic->ic_modecaps); 879 return EINVAL; 880 } 881 882 /* 883 * Verify at least one channel is present in the available 884 * channel list before committing to the new mode. 885 */ 886 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 887 modeflags = chanflags[mode]; 888 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 889 c = &ic->ic_channels[i]; 890 if (c->ic_flags == 0) 891 continue; 892 if (mode == IEEE80211_MODE_AUTO) { 893 /* ignore turbo channels for autoselect */ 894 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 895 break; 896 } else { 897 if ((c->ic_flags & modeflags) == modeflags) 898 break; 899 } 900 } 901 if (i > IEEE80211_CHAN_MAX) { 902 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 903 "%s: no channels found for mode %u\n", __func__, mode); 904 return EINVAL; 905 } 906 907 /* 908 * Calculate the active channel set. 909 */ 910 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 911 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 912 c = &ic->ic_channels[i]; 913 if (c->ic_flags == 0) 914 continue; 915 if (mode == IEEE80211_MODE_AUTO) { 916 /* take anything but pure turbo channels */ 917 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 918 setbit(ic->ic_chan_active, i); 919 } else { 920 if ((c->ic_flags & modeflags) == modeflags) 921 setbit(ic->ic_chan_active, i); 922 } 923 } 924 /* 925 * If no current/default channel is setup or the current 926 * channel is wrong for the mode then pick the first 927 * available channel from the active list. This is likely 928 * not the right one. 929 */ 930 if (ic->ic_ibss_chan == NULL || 931 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 932 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 933 if (isset(ic->ic_chan_active, i)) { 934 ic->ic_ibss_chan = &ic->ic_channels[i]; 935 break; 936 } 937 IASSERT(ic->ic_ibss_chan != NULL && 938 isset(ic->ic_chan_active, 939 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 940 ("Bad IBSS channel %u", 941 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 942 } 943 /* 944 * If the desired channel is set but no longer valid then reset it. 945 */ 946 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 947 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 948 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 949 950 /* 951 * Do mode-specific rate setup. 952 */ 953 if (mode == IEEE80211_MODE_11G) { 954 /* 955 * Use a mixed 11b/11g rate set. 956 */ 957 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 958 IEEE80211_MODE_11G); 959 } else if (mode == IEEE80211_MODE_11B) { 960 /* 961 * Force pure 11b rate set. 962 */ 963 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 964 IEEE80211_MODE_11B); 965 } 966 /* 967 * Setup an initial rate set according to the 968 * current/default channel selected above. This 969 * will be changed when scanning but must exist 970 * now so driver have a consistent state of ic_ibss_chan. 971 */ 972 if (ic->ic_bss) /* NB: can be called before lateattach */ 973 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 974 975 ic->ic_curmode = mode; 976 ieee80211_reset_erp(ic); /* reset ERP state */ 977 ieee80211_wme_initparams(ic); /* reset WME stat */ 978 979 return 0; 980 #undef N 981 } 982 983 /* 984 * Return the phy mode for with the specified channel so the 985 * caller can select a rate set. This is problematic for channels 986 * where multiple operating modes are possible (e.g. 11g+11b). 987 * In those cases we defer to the current operating mode when set. 988 */ 989 enum ieee80211_phymode 990 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 991 { 992 if (IEEE80211_IS_CHAN_T(chan)) { 993 return IEEE80211_MODE_TURBO_A; 994 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 995 return IEEE80211_MODE_11A; 996 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 997 return IEEE80211_MODE_FH; 998 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 999 /* 1000 * This assumes all 11g channels are also usable 1001 * for 11b, which is currently true. 1002 */ 1003 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 1004 return IEEE80211_MODE_TURBO_G; 1005 if (ic->ic_curmode == IEEE80211_MODE_11B) 1006 return IEEE80211_MODE_11B; 1007 return IEEE80211_MODE_11G; 1008 } else 1009 return IEEE80211_MODE_11B; 1010 } 1011 1012 /* 1013 * convert IEEE80211 rate value to ifmedia subtype. 1014 * ieee80211 rate is in unit of 0.5Mbps. 1015 */ 1016 int 1017 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 1018 { 1019 #define N(a) (sizeof(a) / sizeof(a[0])) 1020 static const struct { 1021 u_int m; /* rate + mode */ 1022 u_int r; /* if_media rate */ 1023 } rates[] = { 1024 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 1025 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 1026 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 1027 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 1028 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 1029 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 1030 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 1031 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 1032 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 1033 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 1034 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 1035 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 1036 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 1037 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 1038 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 1039 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 1040 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 1041 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 1042 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 1043 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 1044 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 1045 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 1046 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1047 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1048 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1049 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1050 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1051 /* NB: OFDM72 doesn't really exist so we don't handle it */ 1052 }; 1053 u_int mask, i; 1054 1055 mask = rate & IEEE80211_RATE_VAL; 1056 switch (mode) { 1057 case IEEE80211_MODE_11A: 1058 case IEEE80211_MODE_TURBO_A: 1059 mask |= IFM_IEEE80211_11A; 1060 break; 1061 case IEEE80211_MODE_11B: 1062 mask |= IFM_IEEE80211_11B; 1063 break; 1064 case IEEE80211_MODE_FH: 1065 mask |= IFM_IEEE80211_FH; 1066 break; 1067 case IEEE80211_MODE_AUTO: 1068 /* NB: ic may be NULL for some drivers */ 1069 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1070 mask |= IFM_IEEE80211_FH; 1071 break; 1072 } 1073 /* NB: hack, 11g matches both 11b+11a rates */ 1074 /* fall thru... */ 1075 case IEEE80211_MODE_11G: 1076 case IEEE80211_MODE_TURBO_G: 1077 mask |= IFM_IEEE80211_11G; 1078 break; 1079 } 1080 for (i = 0; i < N(rates); i++) 1081 if (rates[i].m == mask) 1082 return rates[i].r; 1083 return IFM_AUTO; 1084 #undef N 1085 } 1086 1087 int 1088 ieee80211_media2rate(int mword) 1089 { 1090 #define N(a) (sizeof(a) / sizeof(a[0])) 1091 static const int ieeerates[] = { 1092 -1, /* IFM_AUTO */ 1093 0, /* IFM_MANUAL */ 1094 0, /* IFM_NONE */ 1095 2, /* IFM_IEEE80211_FH1 */ 1096 4, /* IFM_IEEE80211_FH2 */ 1097 4, /* IFM_IEEE80211_DS2 */ 1098 11, /* IFM_IEEE80211_DS5 */ 1099 22, /* IFM_IEEE80211_DS11 */ 1100 2, /* IFM_IEEE80211_DS1 */ 1101 44, /* IFM_IEEE80211_DS22 */ 1102 12, /* IFM_IEEE80211_OFDM6 */ 1103 18, /* IFM_IEEE80211_OFDM9 */ 1104 24, /* IFM_IEEE80211_OFDM12 */ 1105 36, /* IFM_IEEE80211_OFDM18 */ 1106 48, /* IFM_IEEE80211_OFDM24 */ 1107 72, /* IFM_IEEE80211_OFDM36 */ 1108 96, /* IFM_IEEE80211_OFDM48 */ 1109 108, /* IFM_IEEE80211_OFDM54 */ 1110 144, /* IFM_IEEE80211_OFDM72 */ 1111 }; 1112 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1113 ieeerates[IFM_SUBTYPE(mword)] : 0; 1114 #undef N 1115 }
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