ieee80211.c revision 1.56
1 /* $NetBSD: ieee80211.c,v 1.56 2015/08/24 22:21:26 pooka 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 1.56 2015/08/24 22:21:26 pooka 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 void 154 ieee80211_ifattach(struct ieee80211com *ic) 155 { 156 struct ifnet *ifp = ic->ic_ifp; 157 struct ieee80211_channel *c; 158 int i; 159 160 #ifdef __NetBSD__ 161 ieee80211_init(); 162 #endif /* __NetBSD__ */ 163 164 ether_ifattach(ifp, ic->ic_myaddr); 165 bpf_attach2(ifp, DLT_IEEE802_11, 166 sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); 167 168 ieee80211_crypto_attach(ic); 169 170 /* 171 * Fill in 802.11 available channel set, mark 172 * all available channels as active, and pick 173 * a default channel if not already specified. 174 */ 175 memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); 176 ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; 177 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 178 c = &ic->ic_channels[i]; 179 if (c->ic_flags) { 180 /* 181 * Verify driver passed us valid data. 182 */ 183 if (i != ieee80211_chan2ieee(ic, c)) { 184 if_printf(ifp, "bad channel ignored; " 185 "freq %u flags %x number %u\n", 186 c->ic_freq, c->ic_flags, i); 187 c->ic_flags = 0; /* NB: remove */ 188 continue; 189 } 190 setbit(ic->ic_chan_avail, i); 191 /* 192 * Identify mode capabilities. 193 */ 194 if (IEEE80211_IS_CHAN_A(c)) 195 ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; 196 if (IEEE80211_IS_CHAN_B(c)) 197 ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; 198 if (IEEE80211_IS_CHAN_PUREG(c)) 199 ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; 200 if (IEEE80211_IS_CHAN_FHSS(c)) 201 ic->ic_modecaps |= 1<<IEEE80211_MODE_FH; 202 if (IEEE80211_IS_CHAN_T(c)) 203 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_A; 204 if (IEEE80211_IS_CHAN_108G(c)) 205 ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO_G; 206 if (ic->ic_curchan == NULL) { 207 /* arbitrarily pick the first channel */ 208 ic->ic_curchan = &ic->ic_channels[i]; 209 } 210 } 211 } 212 /* validate ic->ic_curmode */ 213 if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) 214 ic->ic_curmode = IEEE80211_MODE_AUTO; 215 ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ 216 #if 0 217 /* 218 * Enable WME by default if we're capable. 219 */ 220 if (ic->ic_caps & IEEE80211_C_WME) 221 ic->ic_flags |= IEEE80211_F_WME; 222 #endif 223 (void) ieee80211_setmode(ic, ic->ic_curmode); 224 225 if (ic->ic_bintval == 0) 226 ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; 227 ic->ic_bmisstimeout = 7*ic->ic_bintval; /* default 7 beacons */ 228 ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; 229 IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); 230 231 if (ic->ic_lintval == 0) 232 ic->ic_lintval = ic->ic_bintval; 233 ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; 234 235 LIST_INSERT_HEAD(&ieee80211com_head, ic, ic_list); 236 ieee80211_node_attach(ic); 237 ieee80211_proto_attach(ic); 238 239 ieee80211_add_vap(ic); 240 241 ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ 242 243 /* 244 * Install a default reset method for the ioctl support. 245 * The driver is expected to fill this in before calling us. 246 */ 247 if (ic->ic_reset == NULL) 248 ic->ic_reset = ieee80211_default_reset; 249 } 250 251 void 252 ieee80211_ifdetach(struct ieee80211com *ic) 253 { 254 struct ifnet *ifp = ic->ic_ifp; 255 256 ieee80211_remove_vap(ic); 257 258 ieee80211_sysctl_detach(ic); 259 ieee80211_proto_detach(ic); 260 ieee80211_crypto_detach(ic); 261 ieee80211_node_detach(ic); 262 LIST_REMOVE(ic, ic_list); 263 ifmedia_delete_instance(&ic->ic_media, IFM_INST_ANY); 264 265 IEEE80211_BEACON_LOCK_DESTROY(ic); 266 267 bpf_detach(ifp); 268 ether_ifdetach(ifp); 269 } 270 271 /* 272 * Convert MHz frequency to IEEE channel number. 273 */ 274 u_int 275 ieee80211_mhz2ieee(u_int freq, u_int flags) 276 { 277 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 278 if (freq == 2484) 279 return 14; 280 if (freq < 2484) 281 return (freq - 2407) / 5; 282 else 283 return 15 + ((freq - 2512) / 20); 284 } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5 GHz band */ 285 return (freq - 5000) / 5; 286 } else { /* either, guess */ 287 if (freq == 2484) 288 return 14; 289 if (freq < 2484) 290 return (freq - 2407) / 5; 291 if (freq < 5000) 292 return 15 + ((freq - 2512) / 20); 293 return (freq - 5000) / 5; 294 } 295 } 296 297 /* 298 * Convert channel to IEEE channel number. 299 */ 300 u_int 301 ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) 302 { 303 if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) 304 return c - ic->ic_channels; 305 else if (c == IEEE80211_CHAN_ANYC) 306 return IEEE80211_CHAN_ANY; 307 else if (c != NULL) { 308 if_printf(ic->ic_ifp, "invalid channel freq %u flags %x\n", 309 c->ic_freq, c->ic_flags); 310 return 0; /* XXX */ 311 } else { 312 if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); 313 return 0; /* XXX */ 314 } 315 } 316 317 /* 318 * Convert IEEE channel number to MHz frequency. 319 */ 320 u_int 321 ieee80211_ieee2mhz(u_int chan, u_int flags) 322 { 323 if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ 324 if (chan == 14) 325 return 2484; 326 if (chan < 14) 327 return 2407 + chan*5; 328 else 329 return 2512 + ((chan-15)*20); 330 } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5 GHz band */ 331 return 5000 + (chan*5); 332 } else { /* either, guess */ 333 if (chan == 14) 334 return 2484; 335 if (chan < 14) /* 0-13 */ 336 return 2407 + chan*5; 337 if (chan < 27) /* 15-26 */ 338 return 2512 + ((chan-15)*20); 339 return 5000 + (chan*5); 340 } 341 } 342 343 /* 344 * Setup the media data structures according to the channel and 345 * rate tables. This must be called by the driver after 346 * ieee80211_attach and before most anything else. 347 */ 348 void 349 ieee80211_media_init(struct ieee80211com *ic, 350 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) 351 { 352 #define ADD(_ic, _s, _o) \ 353 ifmedia_add(&(_ic)->ic_media, \ 354 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) 355 struct ifnet *ifp = ic->ic_ifp; 356 struct ifmediareq imr; 357 int i, j, mode, rate, maxrate, mword, mopt, r; 358 const struct ieee80211_rateset *rs; 359 struct ieee80211_rateset allrates; 360 361 /* 362 * Do late attach work that must wait for any subclass 363 * (i.e. driver) work such as overriding methods. 364 */ 365 ieee80211_node_lateattach(ic); 366 367 #ifdef IEEE80211_NO_HOSTAP 368 ic->ic_caps &= ~IEEE80211_C_HOSTAP; 369 #endif /* IEEE80211_NO_HOSTAP */ 370 371 /* 372 * Fill in media characteristics. 373 */ 374 ifmedia_init(&ic->ic_media, 0, media_change, media_stat); 375 maxrate = 0; 376 memset(&allrates, 0, sizeof(allrates)); 377 for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { 378 static const u_int mopts[] = { 379 IFM_AUTO, 380 IFM_IEEE80211_11A, 381 IFM_IEEE80211_11B, 382 IFM_IEEE80211_11G, 383 IFM_IEEE80211_FH, 384 IFM_IEEE80211_11A | IFM_IEEE80211_TURBO, 385 IFM_IEEE80211_11G | IFM_IEEE80211_TURBO, 386 }; 387 if ((ic->ic_modecaps & (1<<mode)) == 0) 388 continue; 389 mopt = mopts[mode]; 390 ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ 391 if (ic->ic_caps & IEEE80211_C_IBSS) 392 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); 393 if (ic->ic_caps & IEEE80211_C_HOSTAP) 394 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); 395 if (ic->ic_caps & IEEE80211_C_AHDEMO) 396 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 397 if (ic->ic_caps & IEEE80211_C_MONITOR) 398 ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR); 399 if (mode == IEEE80211_MODE_AUTO) 400 continue; 401 rs = &ic->ic_sup_rates[mode]; 402 for (i = 0; i < rs->rs_nrates; i++) { 403 rate = rs->rs_rates[i]; 404 mword = ieee80211_rate2media(ic, rate, mode); 405 if (mword == 0) 406 continue; 407 ADD(ic, mword, mopt); 408 if (ic->ic_caps & IEEE80211_C_IBSS) 409 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); 410 if (ic->ic_caps & IEEE80211_C_HOSTAP) 411 ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); 412 if (ic->ic_caps & IEEE80211_C_AHDEMO) 413 ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); 414 if (ic->ic_caps & IEEE80211_C_MONITOR) 415 ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); 416 /* 417 * Add rate to the collection of all rates. 418 */ 419 r = rate & IEEE80211_RATE_VAL; 420 for (j = 0; j < allrates.rs_nrates; j++) 421 if (allrates.rs_rates[j] == r) 422 break; 423 if (j == allrates.rs_nrates) { 424 /* unique, add to the set */ 425 allrates.rs_rates[j] = r; 426 allrates.rs_nrates++; 427 } 428 rate = (rate & IEEE80211_RATE_VAL) / 2; 429 if (rate > maxrate) 430 maxrate = rate; 431 } 432 } 433 for (i = 0; i < allrates.rs_nrates; i++) { 434 mword = ieee80211_rate2media(ic, allrates.rs_rates[i], 435 IEEE80211_MODE_AUTO); 436 if (mword == 0) 437 continue; 438 mword = IFM_SUBTYPE(mword); /* remove media options */ 439 ADD(ic, mword, 0); 440 if (ic->ic_caps & IEEE80211_C_IBSS) 441 ADD(ic, mword, IFM_IEEE80211_ADHOC); 442 if (ic->ic_caps & IEEE80211_C_HOSTAP) 443 ADD(ic, mword, IFM_IEEE80211_HOSTAP); 444 if (ic->ic_caps & IEEE80211_C_AHDEMO) 445 ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); 446 if (ic->ic_caps & IEEE80211_C_MONITOR) 447 ADD(ic, mword, IFM_IEEE80211_MONITOR); 448 } 449 ieee80211_media_status(ifp, &imr); 450 ifmedia_set(&ic->ic_media, imr.ifm_active); 451 452 if (maxrate) 453 ifp->if_baudrate = IF_Mbps(maxrate); 454 #undef ADD 455 } 456 457 void 458 ieee80211_announce(struct ieee80211com *ic) 459 { 460 struct ifnet *ifp = ic->ic_ifp; 461 int i, mode, rate, mword; 462 struct ieee80211_rateset *rs; 463 464 for (mode = IEEE80211_MODE_11A; mode < IEEE80211_MODE_MAX; mode++) { 465 if ((ic->ic_modecaps & (1<<mode)) == 0) 466 continue; 467 aprint_normal("%s: %s rates: ", ifp->if_xname, 468 ieee80211_phymode_name[mode]); 469 rs = &ic->ic_sup_rates[mode]; 470 for (i = 0; i < rs->rs_nrates; i++) { 471 rate = rs->rs_rates[i]; 472 mword = ieee80211_rate2media(ic, rate, mode); 473 if (mword == 0) 474 continue; 475 aprint_normal("%s%d%sMbps", (i != 0 ? " " : ""), 476 (rate & IEEE80211_RATE_VAL) / 2, 477 ((rate & 0x1) != 0 ? ".5" : "")); 478 } 479 aprint_normal("\n"); 480 } 481 } 482 483 static int 484 findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) 485 { 486 #define IEEERATE(_ic,_m,_i) \ 487 ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) 488 int i, nrates = ic->ic_sup_rates[mode].rs_nrates; 489 for (i = 0; i < nrates; i++) 490 if (IEEERATE(ic, mode, i) == rate) 491 return i; 492 return -1; 493 #undef IEEERATE 494 } 495 496 /* 497 * Find an instance by its mac address. 498 */ 499 struct ieee80211com * 500 ieee80211_find_vap(const u_int8_t mac[IEEE80211_ADDR_LEN]) 501 { 502 int s; 503 struct ieee80211com *ic; 504 505 s = splnet(); 506 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 507 if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) 508 break; 509 splx(s); 510 return ic; 511 } 512 513 static struct ieee80211com * 514 ieee80211_find_instance(struct ifnet *ifp) 515 { 516 int s; 517 struct ieee80211com *ic; 518 519 s = splnet(); 520 /* XXX not right for multiple instances but works for now */ 521 SLIST_FOREACH(ic, &ieee80211_list, ic_next) 522 if (ic->ic_ifp == ifp) 523 break; 524 splx(s); 525 return ic; 526 } 527 528 /* 529 * Handle a media change request. 530 */ 531 int 532 ieee80211_media_change(struct ifnet *ifp) 533 { 534 struct ieee80211com *ic; 535 struct ifmedia_entry *ime; 536 enum ieee80211_opmode newopmode; 537 enum ieee80211_phymode newphymode; 538 int i, j, newrate, error = 0; 539 540 ic = ieee80211_find_instance(ifp); 541 if (!ic) { 542 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 543 return EINVAL; 544 } 545 ime = ic->ic_media.ifm_cur; 546 /* 547 * First, identify the phy mode. 548 */ 549 switch (IFM_MODE(ime->ifm_media)) { 550 case IFM_IEEE80211_11A: 551 newphymode = IEEE80211_MODE_11A; 552 break; 553 case IFM_IEEE80211_11B: 554 newphymode = IEEE80211_MODE_11B; 555 break; 556 case IFM_IEEE80211_11G: 557 newphymode = IEEE80211_MODE_11G; 558 break; 559 case IFM_IEEE80211_FH: 560 newphymode = IEEE80211_MODE_FH; 561 break; 562 case IFM_AUTO: 563 newphymode = IEEE80211_MODE_AUTO; 564 break; 565 default: 566 return EINVAL; 567 } 568 /* 569 * Turbo mode is an ``option''. 570 * XXX does not apply to AUTO 571 */ 572 if (ime->ifm_media & IFM_IEEE80211_TURBO) { 573 if (newphymode == IEEE80211_MODE_11A) 574 newphymode = IEEE80211_MODE_TURBO_A; 575 else if (newphymode == IEEE80211_MODE_11G) 576 newphymode = IEEE80211_MODE_TURBO_G; 577 else 578 return EINVAL; 579 } 580 /* 581 * Validate requested mode is available. 582 */ 583 if ((ic->ic_modecaps & (1<<newphymode)) == 0) 584 return EINVAL; 585 586 /* 587 * Next, the fixed/variable rate. 588 */ 589 i = -1; 590 if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { 591 /* 592 * Convert media subtype to rate. 593 */ 594 newrate = ieee80211_media2rate(ime->ifm_media); 595 if (newrate == 0) 596 return EINVAL; 597 /* 598 * Check the rate table for the specified/current phy. 599 */ 600 if (newphymode == IEEE80211_MODE_AUTO) { 601 /* 602 * In autoselect mode search for the rate. 603 */ 604 for (j = IEEE80211_MODE_11A; 605 j < IEEE80211_MODE_MAX; j++) { 606 if ((ic->ic_modecaps & (1<<j)) == 0) 607 continue; 608 i = findrate(ic, j, newrate); 609 if (i != -1) { 610 /* lock mode too */ 611 newphymode = j; 612 break; 613 } 614 } 615 } else { 616 i = findrate(ic, newphymode, newrate); 617 } 618 if (i == -1) /* mode/rate mismatch */ 619 return EINVAL; 620 } 621 /* NB: defer rate setting to later */ 622 623 /* 624 * Deduce new operating mode but don't install it just yet. 625 */ 626 if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == 627 (IFM_IEEE80211_ADHOC|IFM_FLAG0)) 628 newopmode = IEEE80211_M_AHDEMO; 629 else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) 630 newopmode = IEEE80211_M_HOSTAP; 631 else if (ime->ifm_media & IFM_IEEE80211_ADHOC) 632 newopmode = IEEE80211_M_IBSS; 633 else if (ime->ifm_media & IFM_IEEE80211_MONITOR) 634 newopmode = IEEE80211_M_MONITOR; 635 else 636 newopmode = IEEE80211_M_STA; 637 638 #ifndef IEEE80211_NO_HOSTAP 639 /* 640 * Autoselect doesn't make sense when operating as an AP. 641 * If no phy mode has been selected, pick one and lock it 642 * down so rate tables can be used in forming beacon frames 643 * and the like. 644 */ 645 if (newopmode == IEEE80211_M_HOSTAP && 646 newphymode == IEEE80211_MODE_AUTO) { 647 for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) 648 if (ic->ic_modecaps & (1<<j)) { 649 newphymode = j; 650 break; 651 } 652 } 653 #endif /* !IEEE80211_NO_HOSTAP */ 654 655 /* 656 * Handle phy mode change. 657 */ 658 if (ic->ic_curmode != newphymode) { /* change phy mode */ 659 error = ieee80211_setmode(ic, newphymode); 660 if (error != 0) 661 return error; 662 error = ENETRESET; 663 } 664 665 /* 666 * Committed to changes, install the rate setting. 667 */ 668 if (ic->ic_fixed_rate != i) { 669 ic->ic_fixed_rate = i; /* set fixed tx rate */ 670 error = ENETRESET; 671 } 672 673 /* 674 * Handle operating mode change. 675 */ 676 if (ic->ic_opmode != newopmode) { 677 ic->ic_opmode = newopmode; 678 switch (newopmode) { 679 case IEEE80211_M_AHDEMO: 680 case IEEE80211_M_HOSTAP: 681 case IEEE80211_M_STA: 682 case IEEE80211_M_MONITOR: 683 ic->ic_flags &= ~IEEE80211_F_IBSSON; 684 break; 685 case IEEE80211_M_IBSS: 686 ic->ic_flags |= IEEE80211_F_IBSSON; 687 break; 688 } 689 /* 690 * Yech, slot time may change depending on the 691 * operating mode so reset it to be sure everything 692 * is setup appropriately. 693 */ 694 ieee80211_reset_erp(ic); 695 ieee80211_wme_initparams(ic); /* after opmode change */ 696 error = ENETRESET; 697 } 698 #ifdef notdef 699 if (error == 0) 700 ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); 701 #endif 702 return error; 703 } 704 705 void 706 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) 707 { 708 struct ieee80211com *ic; 709 struct ieee80211_rateset *rs; 710 711 ic = ieee80211_find_instance(ifp); 712 if (!ic) { 713 if_printf(ifp, "%s: no 802.11 instance!\n", __func__); 714 return; 715 } 716 imr->ifm_status = IFM_AVALID; 717 imr->ifm_active = IFM_IEEE80211; 718 if (ic->ic_state == IEEE80211_S_RUN) 719 imr->ifm_status |= IFM_ACTIVE; 720 /* 721 * Calculate a current rate if possible. 722 */ 723 if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { 724 /* 725 * A fixed rate is set, report that. 726 */ 727 rs = &ic->ic_sup_rates[ic->ic_curmode]; 728 imr->ifm_active |= ieee80211_rate2media(ic, 729 rs->rs_rates[ic->ic_fixed_rate], ic->ic_curmode); 730 } else if (ic->ic_opmode == IEEE80211_M_STA) { 731 /* 732 * In station mode report the current transmit rate. 733 */ 734 rs = &ic->ic_bss->ni_rates; 735 imr->ifm_active |= ieee80211_rate2media(ic, 736 rs->rs_rates[ic->ic_bss->ni_txrate], ic->ic_curmode); 737 } else 738 imr->ifm_active |= IFM_AUTO; 739 switch (ic->ic_opmode) { 740 case IEEE80211_M_STA: 741 break; 742 case IEEE80211_M_IBSS: 743 imr->ifm_active |= IFM_IEEE80211_ADHOC; 744 break; 745 case IEEE80211_M_AHDEMO: 746 /* should not come here */ 747 break; 748 case IEEE80211_M_HOSTAP: 749 imr->ifm_active |= IFM_IEEE80211_HOSTAP; 750 break; 751 case IEEE80211_M_MONITOR: 752 imr->ifm_active |= IFM_IEEE80211_MONITOR; 753 break; 754 } 755 switch (ic->ic_curmode) { 756 case IEEE80211_MODE_11A: 757 imr->ifm_active |= IFM_IEEE80211_11A; 758 break; 759 case IEEE80211_MODE_11B: 760 imr->ifm_active |= IFM_IEEE80211_11B; 761 break; 762 case IEEE80211_MODE_11G: 763 imr->ifm_active |= IFM_IEEE80211_11G; 764 break; 765 case IEEE80211_MODE_FH: 766 imr->ifm_active |= IFM_IEEE80211_FH; 767 break; 768 case IEEE80211_MODE_TURBO_A: 769 imr->ifm_active |= IFM_IEEE80211_11A 770 | IFM_IEEE80211_TURBO; 771 break; 772 case IEEE80211_MODE_TURBO_G: 773 imr->ifm_active |= IFM_IEEE80211_11G 774 | IFM_IEEE80211_TURBO; 775 break; 776 } 777 } 778 779 void 780 ieee80211_watchdog(struct ieee80211com *ic) 781 { 782 struct ieee80211_node_table *nt; 783 int need_inact_timer = 0; 784 785 if (ic->ic_state != IEEE80211_S_INIT) { 786 if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0) 787 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 788 nt = &ic->ic_scan; 789 if (nt->nt_inact_timer) { 790 if (--nt->nt_inact_timer == 0) 791 nt->nt_timeout(nt); 792 need_inact_timer += nt->nt_inact_timer; 793 } 794 nt = &ic->ic_sta; 795 if (nt->nt_inact_timer) { 796 if (--nt->nt_inact_timer == 0) 797 nt->nt_timeout(nt); 798 need_inact_timer += nt->nt_inact_timer; 799 } 800 } 801 if (ic->ic_mgt_timer != 0 || need_inact_timer) 802 ic->ic_ifp->if_timer = 1; 803 } 804 805 const struct ieee80211_rateset ieee80211_std_rateset_11a = 806 { 8, { 12, 18, 24, 36, 48, 72, 96, 108 } }; 807 808 const struct ieee80211_rateset ieee80211_std_rateset_11b = 809 { 4, { 2, 4, 11, 22 } }; 810 811 const struct ieee80211_rateset ieee80211_std_rateset_11g = 812 { 12, { 2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108 } }; 813 814 /* 815 * Set the current phy mode and recalculate the active channel 816 * set based on the available channels for this mode. Also 817 * select a new default/current channel if the current one is 818 * inappropriate for this mode. 819 */ 820 int 821 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode) 822 { 823 #define N(a) (sizeof(a) / sizeof(a[0])) 824 static const u_int chanflags[] = { 825 0, /* IEEE80211_MODE_AUTO */ 826 IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */ 827 IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */ 828 IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */ 829 IEEE80211_CHAN_FHSS, /* IEEE80211_MODE_FH */ 830 IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO_A */ 831 IEEE80211_CHAN_108G, /* IEEE80211_MODE_TURBO_G */ 832 }; 833 struct ieee80211_channel *c; 834 u_int modeflags; 835 int i; 836 837 /* validate new mode */ 838 if ((ic->ic_modecaps & (1<<mode)) == 0) { 839 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 840 "%s: mode %u not supported (caps 0x%x)\n", 841 __func__, mode, ic->ic_modecaps); 842 return EINVAL; 843 } 844 845 /* 846 * Verify at least one channel is present in the available 847 * channel list before committing to the new mode. 848 */ 849 IASSERT(mode < N(chanflags), ("Unexpected mode %u", mode)); 850 modeflags = chanflags[mode]; 851 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 852 c = &ic->ic_channels[i]; 853 if (c->ic_flags == 0) 854 continue; 855 if (mode == IEEE80211_MODE_AUTO) { 856 /* ignore turbo channels for autoselect */ 857 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 858 break; 859 } else { 860 if ((c->ic_flags & modeflags) == modeflags) 861 break; 862 } 863 } 864 if (i > IEEE80211_CHAN_MAX) { 865 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 866 "%s: no channels found for mode %u\n", __func__, mode); 867 return EINVAL; 868 } 869 870 /* 871 * Calculate the active channel set. 872 */ 873 memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active)); 874 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { 875 c = &ic->ic_channels[i]; 876 if (c->ic_flags == 0) 877 continue; 878 if (mode == IEEE80211_MODE_AUTO) { 879 /* take anything but pure turbo channels */ 880 if ((c->ic_flags & IEEE80211_CHAN_TURBO) == 0) 881 setbit(ic->ic_chan_active, i); 882 } else { 883 if ((c->ic_flags & modeflags) == modeflags) 884 setbit(ic->ic_chan_active, i); 885 } 886 } 887 /* 888 * If no current/default channel is setup or the current 889 * channel is wrong for the mode then pick the first 890 * available channel from the active list. This is likely 891 * not the right one. 892 */ 893 if (ic->ic_ibss_chan == NULL || 894 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) { 895 for (i = 0; i <= IEEE80211_CHAN_MAX; i++) 896 if (isset(ic->ic_chan_active, i)) { 897 ic->ic_ibss_chan = &ic->ic_channels[i]; 898 break; 899 } 900 IASSERT(ic->ic_ibss_chan != NULL && 901 isset(ic->ic_chan_active, 902 ieee80211_chan2ieee(ic, ic->ic_ibss_chan)), 903 ("Bad IBSS channel %u", 904 ieee80211_chan2ieee(ic, ic->ic_ibss_chan))); 905 } 906 /* 907 * If the desired channel is set but no longer valid then reset it. 908 */ 909 if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && 910 isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_des_chan))) 911 ic->ic_des_chan = IEEE80211_CHAN_ANYC; 912 913 /* 914 * Do mode-specific rate setup. 915 */ 916 if (mode == IEEE80211_MODE_11G) { 917 /* 918 * Use a mixed 11b/11g rate set. 919 */ 920 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 921 IEEE80211_MODE_11G); 922 } else if (mode == IEEE80211_MODE_11B) { 923 /* 924 * Force pure 11b rate set. 925 */ 926 ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], 927 IEEE80211_MODE_11B); 928 } 929 /* 930 * Setup an initial rate set according to the 931 * current/default channel selected above. This 932 * will be changed when scanning but must exist 933 * now so driver have a consistent state of ic_ibss_chan. 934 */ 935 if (ic->ic_bss) /* NB: can be called before lateattach */ 936 ic->ic_bss->ni_rates = ic->ic_sup_rates[mode]; 937 938 ic->ic_curmode = mode; 939 ieee80211_reset_erp(ic); /* reset ERP state */ 940 ieee80211_wme_initparams(ic); /* reset WME stat */ 941 942 return 0; 943 #undef N 944 } 945 946 /* 947 * Return the phy mode for with the specified channel so the 948 * caller can select a rate set. This is problematic for channels 949 * where multiple operating modes are possible (e.g. 11g+11b). 950 * In those cases we defer to the current operating mode when set. 951 */ 952 enum ieee80211_phymode 953 ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan) 954 { 955 if (IEEE80211_IS_CHAN_T(chan)) { 956 return IEEE80211_MODE_TURBO_A; 957 } else if (IEEE80211_IS_CHAN_5GHZ(chan)) { 958 return IEEE80211_MODE_11A; 959 } else if (IEEE80211_IS_CHAN_FHSS(chan)) 960 return IEEE80211_MODE_FH; 961 else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN)) { 962 /* 963 * This assumes all 11g channels are also usable 964 * for 11b, which is currently true. 965 */ 966 if (ic->ic_curmode == IEEE80211_MODE_TURBO_G) 967 return IEEE80211_MODE_TURBO_G; 968 if (ic->ic_curmode == IEEE80211_MODE_11B) 969 return IEEE80211_MODE_11B; 970 return IEEE80211_MODE_11G; 971 } else 972 return IEEE80211_MODE_11B; 973 } 974 975 /* 976 * convert IEEE80211 rate value to ifmedia subtype. 977 * ieee80211 rate is in unit of 0.5Mbps. 978 */ 979 int 980 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) 981 { 982 #define N(a) (sizeof(a) / sizeof(a[0])) 983 static const struct { 984 u_int m; /* rate + mode */ 985 u_int r; /* if_media rate */ 986 } rates[] = { 987 { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, 988 { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, 989 { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, 990 { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, 991 { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, 992 { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, 993 { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, 994 { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, 995 { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, 996 { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, 997 { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, 998 { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, 999 { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, 1000 { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, 1001 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, 1002 { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, 1003 { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, 1004 { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, 1005 { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, 1006 { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, 1007 { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, 1008 { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, 1009 { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, 1010 { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, 1011 { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, 1012 { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, 1013 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, 1014 /* NB: OFDM72 doesn't realy exist so we don't handle it */ 1015 }; 1016 u_int mask, i; 1017 1018 mask = rate & IEEE80211_RATE_VAL; 1019 switch (mode) { 1020 case IEEE80211_MODE_11A: 1021 case IEEE80211_MODE_TURBO_A: 1022 mask |= IFM_IEEE80211_11A; 1023 break; 1024 case IEEE80211_MODE_11B: 1025 mask |= IFM_IEEE80211_11B; 1026 break; 1027 case IEEE80211_MODE_FH: 1028 mask |= IFM_IEEE80211_FH; 1029 break; 1030 case IEEE80211_MODE_AUTO: 1031 /* NB: ic may be NULL for some drivers */ 1032 if (ic && ic->ic_phytype == IEEE80211_T_FH) { 1033 mask |= IFM_IEEE80211_FH; 1034 break; 1035 } 1036 /* NB: hack, 11g matches both 11b+11a rates */ 1037 /* fall thru... */ 1038 case IEEE80211_MODE_11G: 1039 case IEEE80211_MODE_TURBO_G: 1040 mask |= IFM_IEEE80211_11G; 1041 break; 1042 } 1043 for (i = 0; i < N(rates); i++) 1044 if (rates[i].m == mask) 1045 return rates[i].r; 1046 return IFM_AUTO; 1047 #undef N 1048 } 1049 1050 int 1051 ieee80211_media2rate(int mword) 1052 { 1053 #define N(a) (sizeof(a) / sizeof(a[0])) 1054 static const int ieeerates[] = { 1055 -1, /* IFM_AUTO */ 1056 0, /* IFM_MANUAL */ 1057 0, /* IFM_NONE */ 1058 2, /* IFM_IEEE80211_FH1 */ 1059 4, /* IFM_IEEE80211_FH2 */ 1060 4, /* IFM_IEEE80211_DS2 */ 1061 11, /* IFM_IEEE80211_DS5 */ 1062 22, /* IFM_IEEE80211_DS11 */ 1063 2, /* IFM_IEEE80211_DS1 */ 1064 44, /* IFM_IEEE80211_DS22 */ 1065 12, /* IFM_IEEE80211_OFDM6 */ 1066 18, /* IFM_IEEE80211_OFDM9 */ 1067 24, /* IFM_IEEE80211_OFDM12 */ 1068 36, /* IFM_IEEE80211_OFDM18 */ 1069 48, /* IFM_IEEE80211_OFDM24 */ 1070 72, /* IFM_IEEE80211_OFDM36 */ 1071 96, /* IFM_IEEE80211_OFDM48 */ 1072 108, /* IFM_IEEE80211_OFDM54 */ 1073 144, /* IFM_IEEE80211_OFDM72 */ 1074 }; 1075 return IFM_SUBTYPE(mword) < N(ieeerates) ? 1076 ieeerates[IFM_SUBTYPE(mword)] : 0; 1077 #undef N 1078 } 1079
Indexes created Wed Sep 24 15:09:51 GMT 2025