ieee80211_tdma.c revision 188925
1/*- 2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 3 * Copyright (c) 2007-2009 Intel Corporation 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28#ifdef __FreeBSD__ 29__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_tdma.c 188925 2009-02-22 18:48:54Z sam $"); 30#endif 31 32/* 33 * IEEE 802.11 TDMA mode support. 34 */ 35#include "opt_inet.h" 36#include "opt_wlan.h" 37 38#ifdef IEEE80211_SUPPORT_TDMA 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/mbuf.h> 42#include <sys/malloc.h> 43#include <sys/kernel.h> 44 45#include <sys/socket.h> 46#include <sys/sockio.h> 47#include <sys/endian.h> 48#include <sys/errno.h> 49#include <sys/proc.h> 50#include <sys/sysctl.h> 51 52#include <net/if.h> 53#include <net/if_media.h> 54#include <net/if_llc.h> 55#include <net/ethernet.h> 56 57#include <net/bpf.h> 58 59#include <net80211/ieee80211_var.h> 60#include <net80211/ieee80211_tdma.h> 61#include <net80211/ieee80211_input.h> 62 63#include "opt_tdma.h" 64#ifndef TDMA_SLOTLEN_DEFAULT 65#define TDMA_SLOTLEN_DEFAULT 10*1000 /* 10ms */ 66#endif 67#ifndef TDMA_SLOTCNT_DEFAULT 68#define TDMA_SLOTCNT_DEFAULT 2 /* 2x (pt-to-pt) */ 69#endif 70#ifndef TDMA_BINTVAL_DEFAULT 71#define TDMA_BINTVAL_DEFAULT 5 /* 5x ~= 100TU beacon intvl */ 72#endif 73#ifndef TDMA_TXRATE_11B_DEFAULT 74#define TDMA_TXRATE_11B_DEFAULT 2*11 75#endif 76#ifndef TDMA_TXRATE_11G_DEFAULT 77#define TDMA_TXRATE_11G_DEFAULT 2*24 78#endif 79#ifndef TDMA_TXRATE_11A_DEFAULT 80#define TDMA_TXRATE_11A_DEFAULT 2*24 81#endif 82#ifndef TDMA_TXRATE_STURBO_A_DEFAULT 83#define TDMA_TXRATE_STURBO_A_DEFAULT 2*24 84#endif 85#ifndef TDMA_TXRATE_HALF_DEFAULT 86#define TDMA_TXRATE_HALF_DEFAULT 2*12 87#endif 88#ifndef TDMA_TXRATE_QUARTER_DEFAULT 89#define TDMA_TXRATE_QUARTER_DEFAULT 2*6 90#endif 91#ifndef TDMA_TXRATE_11NA_DEFAULT 92#define TDMA_TXRATE_11NA_DEFAULT (4 | IEEE80211_RATE_MCS) 93#endif 94#ifndef TDMA_TXRATE_11NG_DEFAULT 95#define TDMA_TXRATE_11NG_DEFAULT (4 | IEEE80211_RATE_MCS) 96#endif 97 98static void tdma_vdetach(struct ieee80211vap *vap); 99static int tdma_newstate(struct ieee80211vap *, enum ieee80211_state, int); 100static void tdma_beacon_miss(struct ieee80211vap *vap); 101static void tdma_recv_mgmt(struct ieee80211_node *, struct mbuf *, 102 int subtype, int rssi, int noise, uint32_t rstamp); 103static int tdma_update(struct ieee80211vap *vap, 104 const struct ieee80211_tdma_param *tdma, struct ieee80211_node *ni, 105 int pickslot); 106static int tdma_process_params(struct ieee80211_node *ni, 107 const u_int8_t *ie, u_int32_t rstamp, const struct ieee80211_frame *wh); 108 109static void 110settxparms(struct ieee80211vap *vap, enum ieee80211_phymode mode, int rate) 111{ 112 vap->iv_txparms[mode].ucastrate = rate; 113 vap->iv_txparms[mode].mcastrate = rate; 114} 115 116static void 117setackpolicy(struct ieee80211com *ic, int noack) 118{ 119 struct ieee80211_wme_state *wme = &ic->ic_wme; 120 int ac; 121 122 for (ac = 0; ac < WME_NUM_AC; ac++) { 123 wme->wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy = noack; 124 wme->wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy = noack; 125 } 126} 127 128void 129ieee80211_tdma_vattach(struct ieee80211vap *vap) 130{ 131 struct ieee80211_tdma_state *ts; 132 133 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 134 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 135 136 ts = (struct ieee80211_tdma_state *) malloc( 137 sizeof(struct ieee80211_tdma_state), M_80211_VAP, M_NOWAIT | M_ZERO); 138 if (ts == NULL) { 139 printf("%s: cannot allocate TDMA state block\n", __func__); 140 /* NB: fall back to adhdemo mode */ 141 vap->iv_caps &= ~IEEE80211_C_TDMA; 142 return; 143 } 144 /* NB: default configuration is passive so no beacons */ 145 ts->tdma_slotlen = TDMA_SLOTLEN_DEFAULT; 146 ts->tdma_slotcnt = TDMA_SLOTCNT_DEFAULT; 147 ts->tdma_bintval = TDMA_BINTVAL_DEFAULT; 148 ts->tdma_slot = 1; /* passive operation */ 149 150 /* setup default fixed rates */ 151 settxparms(vap, IEEE80211_MODE_11A, TDMA_TXRATE_11A_DEFAULT); 152 settxparms(vap, IEEE80211_MODE_11B, TDMA_TXRATE_11B_DEFAULT); 153 settxparms(vap, IEEE80211_MODE_11G, TDMA_TXRATE_11G_DEFAULT); 154 settxparms(vap, IEEE80211_MODE_STURBO_A, TDMA_TXRATE_STURBO_A_DEFAULT); 155 settxparms(vap, IEEE80211_MODE_11NA, TDMA_TXRATE_11NA_DEFAULT); 156 settxparms(vap, IEEE80211_MODE_11NG, TDMA_TXRATE_11NG_DEFAULT); 157 settxparms(vap, IEEE80211_MODE_HALF, TDMA_TXRATE_HALF_DEFAULT); 158 settxparms(vap, IEEE80211_MODE_QUARTER, TDMA_TXRATE_QUARTER_DEFAULT); 159 160 setackpolicy(vap->iv_ic, 1); /* disable ACK's */ 161 162 ts->tdma_opdetach = vap->iv_opdetach; 163 vap->iv_opdetach = tdma_vdetach; 164 ts->tdma_newstate = vap->iv_newstate; 165 vap->iv_newstate = tdma_newstate; 166 vap->iv_bmiss = tdma_beacon_miss; 167 ts->tdma_recv_mgmt = vap->iv_recv_mgmt; 168 vap->iv_recv_mgmt = tdma_recv_mgmt; 169 170 vap->iv_tdma = ts; 171} 172 173static void 174tdma_vdetach(struct ieee80211vap *vap) 175{ 176 struct ieee80211_tdma_state *ts = vap->iv_tdma; 177 178 ts->tdma_opdetach(vap); 179 free(vap->iv_tdma, M_80211_VAP); 180 181 setackpolicy(vap->iv_ic, 0); /* enable ACK's */ 182} 183 184static void 185sta_leave(void *arg, struct ieee80211_node *ni) 186{ 187 struct ieee80211vap *vap = arg; 188 189 if (ni->ni_vap == vap && ni != vap->iv_bss) 190 ieee80211_node_leave(ni); 191} 192 193/* 194 * TDMA state machine handler. 195 */ 196static int 197tdma_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 198{ 199 struct ieee80211_tdma_state *ts = vap->iv_tdma; 200 struct ieee80211com *ic = vap->iv_ic; 201 enum ieee80211_state ostate; 202 int status; 203 204 IEEE80211_LOCK_ASSERT(ic); 205 206 ostate = vap->iv_state; 207 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 208 __func__, ieee80211_state_name[ostate], 209 ieee80211_state_name[nstate], arg); 210 211 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 212 callout_stop(&vap->iv_swbmiss); 213 if (nstate == IEEE80211_S_SCAN && 214 (ostate == IEEE80211_S_INIT || ostate == IEEE80211_S_RUN) && 215 ts->tdma_slot != 0) { 216 /* 217 * Override adhoc behaviour when operating as a slave; 218 * we need to scan even if the channel is locked. 219 */ 220 vap->iv_state = nstate; /* state transition */ 221 ieee80211_cancel_scan(vap); /* background scan */ 222 if (ostate == IEEE80211_S_RUN) { 223 /* purge station table; entries are stale */ 224 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 225 } 226 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 227 ieee80211_check_scan(vap, 228 vap->iv_scanreq_flags, 229 vap->iv_scanreq_duration, 230 vap->iv_scanreq_mindwell, 231 vap->iv_scanreq_maxdwell, 232 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 233 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 234 } else 235 ieee80211_check_scan_current(vap); 236 status = 0; 237 } else { 238 status = ts->tdma_newstate(vap, nstate, arg); 239 } 240 if (status == 0 && 241 nstate == IEEE80211_S_RUN && ostate != IEEE80211_S_RUN && 242 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) && 243 ts->tdma_slot != 0 && 244 vap->iv_des_chan == IEEE80211_CHAN_ANYC) { 245 /* 246 * Start s/w beacon miss timer for slave devices w/o 247 * hardware support. Note we do this only if we're 248 * not locked to a channel (i.e. roam to follow the 249 * master). The 2x is a fudge for our doing this in 250 * software. 251 */ 252 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 253 2 * vap->iv_bmissthreshold * ts->tdma_bintval * 254 ((ts->tdma_slotcnt * ts->tdma_slotlen) / 1024)); 255 vap->iv_swbmiss_count = 0; 256 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 257 ieee80211_swbmiss, vap); 258 } 259 return status; 260} 261 262static void 263tdma_beacon_miss(struct ieee80211vap *vap) 264{ 265 struct ieee80211_tdma_state *ts = vap->iv_tdma; 266 267 KASSERT((vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 268 KASSERT(vap->iv_state == IEEE80211_S_RUN, 269 ("wrong state %d", vap->iv_state)); 270 271 IEEE80211_DPRINTF(vap, 272 IEEE80211_MSG_STATE | IEEE80211_MSG_TDMA | IEEE80211_MSG_DEBUG, 273 "beacon miss, mode %u state %s\n", 274 vap->iv_opmode, ieee80211_state_name[vap->iv_state]); 275 276 if (ts->tdma_peer != NULL) { /* XXX? can this be null? */ 277 ieee80211_notify_node_leave(vap->iv_bss); 278 ts->tdma_peer = NULL; 279 /* 280 * Treat beacon miss like an associate failure wrt the 281 * scan policy; this forces the entry in the scan cache 282 * to be ignored after several tries. 283 */ 284 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, 285 IEEE80211_STATUS_TIMEOUT); 286 } 287#if 0 288 ts->tdma_inuse = 0; /* clear slot usage */ 289#endif 290 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 291} 292 293static void 294tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 295 int subtype, int rssi, int noise, uint32_t rstamp) 296{ 297 struct ieee80211com *ic = ni->ni_ic; 298 struct ieee80211vap *vap = ni->ni_vap; 299 struct ieee80211_tdma_state *ts = vap->iv_tdma; 300 301 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON && 302 (ic->ic_flags & IEEE80211_F_SCAN) == 0) { 303 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *); 304 struct ieee80211_scanparams scan; 305 306 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 307 return; 308 if (scan.tdma == NULL) { 309 /* 310 * TDMA stations must beacon a TDMA ie; ignore 311 * any other station. 312 * XXX detect overlapping bss and change channel 313 */ 314 IEEE80211_DISCARD(vap, 315 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 316 wh, ieee80211_mgt_subtype_name[subtype >> 317 IEEE80211_FC0_SUBTYPE_SHIFT], 318 "%s", "no TDMA ie"); 319 vap->iv_stats.is_rx_mgtdiscard++; 320 return; 321 } 322 if (ni == vap->iv_bss && 323 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 324 /* 325 * Fake up a node for this newly 326 * discovered member of the IBSS. 327 */ 328 ni = ieee80211_add_neighbor(vap, wh, &scan); 329 if (ni == NULL) { 330 /* NB: stat kept for alloc failure */ 331 return; 332 } 333 } 334 /* 335 * Check for state updates. 336 */ 337 if (IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) { 338 /* 339 * Count frame now that we know it's to be processed. 340 */ 341 vap->iv_stats.is_rx_beacon++; 342 IEEE80211_NODE_STAT(ni, rx_beacons); 343 /* 344 * Record tsf of last beacon. NB: this must be 345 * done before calling tdma_process_params 346 * as deeper routines reference it. 347 */ 348 memcpy(&ni->ni_tstamp.data, scan.tstamp, 349 sizeof(ni->ni_tstamp.data)); 350 /* 351 * Count beacon frame for s/w bmiss handling. 352 */ 353 vap->iv_swbmiss_count++; 354 /* 355 * Process tdma ie. The contents are used to sync 356 * the slot timing, reconfigure the bss, etc. 357 */ 358 (void) tdma_process_params(ni, scan.tdma, rstamp, wh); 359 return; 360 } 361 /* 362 * NB: defer remaining work to the adhoc code; this causes 363 * 2x parsing of the frame but should happen infrequently 364 */ 365 } 366 ts->tdma_recv_mgmt(ni, m0, subtype, rssi, noise, rstamp); 367} 368 369/* 370 * Update TDMA state on receipt of a beacon frame with 371 * a TDMA information element. The sender's identity 372 * is provided so we can track who our peer is. If pickslot 373 * is non-zero we scan the slot allocation state in the ie 374 * locate a free slot for our use. 375 */ 376static int 377tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma, 378 struct ieee80211_node *ni, int pickslot) 379{ 380 struct ieee80211_tdma_state *ts = vap->iv_tdma; 381 int slotlen, slotcnt, slot, bintval; 382 383 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 384 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 385 386 slotlen = le16toh(tdma->tdma_slotlen); 387 slotcnt = tdma->tdma_slotcnt; 388 bintval = tdma->tdma_bintval; 389 390 /* XXX rate-limit printf's */ 391 if (!(2 <= slotcnt && slotcnt <= IEEE80211_TDMA_MAXSLOTS)) { 392 printf("%s: bogus slot cnt %u\n", __func__, slotcnt); 393 return 0; 394 } 395 /* XXX magic constants */ 396 if (slotlen < 2 || slotlen > (0xfffff/100)) { 397 printf("%s: bogus slot len %u\n", __func__, slotlen); 398 return 0; 399 } 400 if (bintval < 1) { 401 printf("%s: bogus beacon interval %u\n", __func__, bintval); 402 return 0; 403 } 404 if (pickslot) { 405 /* 406 * Pick unoccupied slot. Note we never choose slot 0. 407 */ 408 for (slot = slotcnt-1; slot > 0; slot--) 409 if (isclr(tdma->tdma_inuse, slot)) 410 break; 411 if (slot <= 0) { 412 printf("%s: no free slot, slotcnt %u inuse: 0x%x\n", 413 __func__, slotcnt, tdma->tdma_inuse[0]); 414 /* XXX need to do something better */ 415 return 0; 416 } 417 } else 418 slot = ts->tdma_slot; 419 420 if (slotcnt != ts->tdma_slotcnt || 421 100*slotlen != ts->tdma_slotlen || 422 bintval != ts->tdma_bintval || 423 slot != ts->tdma_slot || 424 ts->tdma_peer != ni) { 425 /* 426 * New/changed parameters; update runtime state. 427 */ 428 /* XXX overwrites user parameters */ 429 ts->tdma_slotcnt = slotcnt; 430 ts->tdma_slotlen = 100*slotlen; 431 ts->tdma_slot = slot; 432 ts->tdma_bintval = bintval; 433 /* mark beacon to be updated before next xmit */ 434 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA); 435 436 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, 437 "%s: slot %u slotcnt %u slotlen %u us bintval %u\n", 438 __func__, slot, slotcnt, 100*slotlen, tdma->tdma_bintval); 439 } 440 /* 441 * Notify driver. Note we can be called before 442 * entering RUN state if we scanned and are 443 * joining an existing bss. In that case do not 444 * call the driver because not all necessary state 445 * has been setup. The next beacon will dtrt. 446 */ 447 if (vap->iv_state == IEEE80211_S_RUN) 448 vap->iv_ic->ic_tdma_update(ni, tdma); 449 /* 450 * Dispatch join event on first beacon from new master. 451 */ 452 if (ts->tdma_peer != ni) { 453 if (ts->tdma_peer != NULL) 454 ieee80211_notify_node_leave(vap->iv_bss); 455 ieee80211_notify_node_join(ni, 1); 456 /* NB: no reference, we just use the address */ 457 ts->tdma_peer = ni; 458 } 459 return 1; 460} 461 462/* 463 * Process received TDMA parameters. 464 */ 465static int 466tdma_process_params(struct ieee80211_node *ni, 467 const u_int8_t *ie, u_int32_t rstamp, const struct ieee80211_frame *wh) 468{ 469 struct ieee80211vap *vap = ni->ni_vap; 470 struct ieee80211_tdma_state *ts = vap->iv_tdma; 471 const struct ieee80211_tdma_param *tdma = 472 (const struct ieee80211_tdma_param *) ie; 473 u_int len = ie[1]; 474 475 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 476 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 477 478 if (len < sizeof(*tdma) - 2) { 479 IEEE80211_DISCARD_IE(vap, 480 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 481 wh, "tdma", "too short, len %u", len); 482 return IEEE80211_REASON_IE_INVALID; 483 } 484 if (tdma->tdma_version != TDMA_VERSION) { 485 IEEE80211_DISCARD_IE(vap, 486 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 487 wh, "tdma", "bad version %u", tdma->tdma_version); 488 return IEEE80211_REASON_IE_INVALID; 489 } 490 /* 491 * Can reach here while scanning, update 492 * operational state only in RUN state. 493 */ 494 if (vap->iv_state == IEEE80211_S_RUN) { 495 if (tdma->tdma_slot != ts->tdma_slot && 496 isclr(ts->tdma_inuse, tdma->tdma_slot)) { 497 IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni, 498 "discovered in slot %u", tdma->tdma_slot); 499 setbit(ts->tdma_inuse, tdma->tdma_slot); 500 /* XXX dispatch event only when operating as master */ 501 if (ts->tdma_slot == 0) 502 ieee80211_notify_node_join(ni, 1); 503 } 504 setbit(ts->tdma_active, tdma->tdma_slot); 505 if (tdma->tdma_slot == ts->tdma_slot-1) { 506 /* 507 * Slave tsf synchronization to station 508 * just before us in the schedule. The driver 509 * is responsible for copying the timestamp 510 * of the received beacon into our beacon 511 * frame so the sender can calculate round 512 * trip time. We cannot do that here because 513 * we don't know how to update our beacon frame. 514 */ 515 (void) tdma_update(vap, tdma, ni, 0); 516 /* XXX reschedule swbmiss timer on parameter change */ 517 } else if (tdma->tdma_slot == ts->tdma_slot+1) { 518 uint64_t tstamp; 519 int32_t rtt; 520 /* 521 * Use returned timstamp to calculate the 522 * roundtrip time. 523 */ 524 memcpy(&tstamp, tdma->tdma_tstamp, 8); 525 /* XXX use only 15 bits of rstamp */ 526 rtt = rstamp - (le64toh(tstamp) & 0x7fff); 527 if (rtt < 0) 528 rtt += 0x7fff; 529 /* XXX hack to quiet normal use */ 530 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X, 531 "tdma rtt %5u [rstamp %5u tstamp %llu]\n", 532 rtt, rstamp, 533 (unsigned long long) le64toh(tstamp)); 534 } else if (tdma->tdma_slot == ts->tdma_slot && 535 le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) { 536 /* 537 * Station using the same slot as us and has 538 * been around longer than us; we must move. 539 * Note this can happen if stations do not 540 * see each other while scanning. 541 */ 542 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, 543 "slot %u collision rxtsf %llu tsf %llu\n", 544 tdma->tdma_slot, 545 (unsigned long long) le64toh(ni->ni_tstamp.tsf), 546 vap->iv_bss->ni_tstamp.tsf); 547 setbit(ts->tdma_inuse, tdma->tdma_slot); 548 549 (void) tdma_update(vap, tdma, ni, 1); 550 } 551 } 552 return 0; 553} 554 555int 556ieee80211_tdma_getslot(struct ieee80211vap *vap) 557{ 558 struct ieee80211_tdma_state *ts = vap->iv_tdma; 559 560 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 561 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 562 return ts->tdma_slot; 563} 564 565/* 566 * Parse a TDMA ie on station join and use it to setup node state. 567 */ 568void 569ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie) 570{ 571 struct ieee80211vap *vap = ni->ni_vap; 572 573 if (vap->iv_caps & IEEE80211_C_TDMA) { 574 const struct ieee80211_tdma_param *tdma = 575 (const struct ieee80211_tdma_param *)ie; 576 struct ieee80211_tdma_state *ts = vap->iv_tdma; 577 /* 578 * Adopt TDMA configuration when joining an 579 * existing network. 580 */ 581 setbit(ts->tdma_inuse, tdma->tdma_slot); 582 (void) tdma_update(vap, tdma, ni, 1); 583 /* 584 * Propagate capabilities based on the local 585 * configuration and the remote station's advertised 586 * capabilities. In particular this permits us to 587 * enable use of QoS to disable ACK's. 588 */ 589 if ((vap->iv_flags & IEEE80211_F_WME) && 590 ni->ni_ies.wme_ie != NULL) 591 ni->ni_flags |= IEEE80211_NODE_QOS; 592 } 593} 594 595#define TDMA_OUI_BYTES 0x00, 0x03, 0x7f 596/* 597 * Add a TDMA parameters element to a frame. 598 */ 599uint8_t * 600ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap) 601{ 602#define ADDSHORT(frm, v) do { \ 603 frm[0] = (v) & 0xff; \ 604 frm[1] = (v) >> 8; \ 605 frm += 2; \ 606} while (0) 607 static const struct ieee80211_tdma_param param = { 608 .tdma_id = IEEE80211_ELEMID_VENDOR, 609 .tdma_len = sizeof(struct ieee80211_tdma_param) - 2, 610 .tdma_oui = { TDMA_OUI_BYTES }, 611 .tdma_type = TDMA_OUI_TYPE, 612 .tdma_subtype = TDMA_SUBTYPE_PARAM, 613 .tdma_version = TDMA_VERSION, 614 }; 615 const struct ieee80211_tdma_state *tdma = vap->iv_tdma; 616 uint16_t slotlen; 617 618 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 619 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 620 621 memcpy(frm, ¶m, sizeof(param)); 622 frm += __offsetof(struct ieee80211_tdma_param, tdma_slot); 623 *frm++ = tdma->tdma_slot; 624 *frm++ = tdma->tdma_slotcnt; 625 /* NB: convert units to fit in 16-bits */ 626 slotlen = tdma->tdma_slotlen / 100; /* 100us units */ 627 ADDSHORT(frm, slotlen); 628 *frm++ = tdma->tdma_bintval; 629 *frm++ = tdma->tdma_inuse[0]; 630 frm += 10; /* pad+timestamp */ 631 return frm; 632#undef ADDSHORT 633} 634#undef TDMA_OUI_BYTES 635 636/* 637 * Update TDMA state at TBTT. 638 */ 639void 640ieee80211_tdma_update_beacon(struct ieee80211vap *vap, 641 struct ieee80211_beacon_offsets *bo) 642{ 643 struct ieee80211_tdma_state *ts = vap->iv_tdma; 644 645 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 646 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 647 648 if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) { 649 (void) ieee80211_add_tdma(bo->bo_tdma, vap); 650 clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA); 651 } 652 if (ts->tdma_slot != 0) /* only on master */ 653 return; 654 if (ts->tdma_count <= 0) { 655 /* 656 * Time to update the mask of active/inuse stations. 657 * We track stations that we've received a beacon 658 * frame from and update this mask periodically. 659 * This allows us to miss a few beacons before marking 660 * a slot free for re-use. 661 */ 662 ts->tdma_inuse[0] = ts->tdma_active[0]; 663 ts->tdma_active[0] = 0x01; 664 /* update next time 'round */ 665 /* XXX use notify framework */ 666 setbit(bo->bo_flags, IEEE80211_BEACON_TDMA); 667 /* NB: use s/w beacon miss threshold; may be too high */ 668 ts->tdma_count = vap->iv_bmissthreshold-1; 669 } else 670 ts->tdma_count--; 671} 672 673int 674ieee80211_tdma_ioctl_get80211(struct ieee80211vap *vap, 675 struct ieee80211req *ireq) 676{ 677 struct ieee80211_tdma_state *ts = vap->iv_tdma; 678 679 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) 680 return EOPNOTSUPP; 681 682 switch (ireq->i_type) { 683 case IEEE80211_IOC_TDMA_SLOT: 684 ireq->i_val = ts->tdma_slot; 685 break; 686 case IEEE80211_IOC_TDMA_SLOTCNT: 687 ireq->i_val = ts->tdma_slotcnt; 688 break; 689 case IEEE80211_IOC_TDMA_SLOTLEN: 690 ireq->i_val = ts->tdma_slotlen; 691 break; 692 case IEEE80211_IOC_TDMA_BINTERVAL: 693 ireq->i_val = ts->tdma_bintval; 694 break; 695 default: 696 return EINVAL; 697 } 698 return 0; 699} 700 701int 702ieee80211_tdma_ioctl_set80211(struct ieee80211vap *vap, 703 struct ieee80211req *ireq) 704{ 705 struct ieee80211_tdma_state *ts = vap->iv_tdma; 706 707 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) 708 return EOPNOTSUPP; 709 710 switch (ireq->i_type) { 711 case IEEE80211_IOC_TDMA_SLOT: 712 if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt)) 713 return EINVAL; 714 if (ireq->i_val != ts->tdma_slot) { 715 ts->tdma_slot = ireq->i_val; 716 return ERESTART; 717 } 718 break; 719 case IEEE80211_IOC_TDMA_SLOTCNT: 720 if (!(2 <= ireq->i_val && 721 ireq->i_val <= IEEE80211_TDMA_MAXSLOTS)) 722 return EINVAL; 723 if (ireq->i_val != ts->tdma_slotcnt) { 724 ts->tdma_slotcnt = ireq->i_val; 725 return ERESTART; 726 } 727 break; 728 case IEEE80211_IOC_TDMA_SLOTLEN: 729 /* 730 * XXX 731 * 150 insures at least 1/8 TU 732 * 0xfffff is the max duration for bursting 733 * (implict by way of 16-bit data type for i_val) 734 */ 735 if (ireq->i_val < 150) 736 return EINVAL; 737 if (ireq->i_val != ts->tdma_slotlen) { 738 ts->tdma_slotlen = ireq->i_val; 739 return ERESTART; 740 } 741 break; 742 case IEEE80211_IOC_TDMA_BINTERVAL: 743 if (ireq->i_val < 1) 744 return EINVAL; 745 if (ireq->i_val != ts->tdma_bintval) { 746 ts->tdma_bintval = ireq->i_val; 747 return ERESTART; 748 } 749 break; 750 default: 751 return EINVAL; 752 } 753 return 0; 754} 755#endif /* IEEE80211_SUPPORT_TDMA */ 756