ieee80211_tdma.c revision 193114
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 193114 2009-05-30 19:57:31Z sam $"); 30#endif 31 32/* 33 * IEEE 802.11 TDMA mode support. 34 */ 35#include "opt_inet.h" 36#include "opt_tdma.h" 37#include "opt_wlan.h" 38 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#ifndef TDMA_SLOTLEN_DEFAULT 64#define TDMA_SLOTLEN_DEFAULT 10*1000 /* 10ms */ 65#endif 66#ifndef TDMA_SLOTCNT_DEFAULT 67#define TDMA_SLOTCNT_DEFAULT 2 /* 2x (pt-to-pt) */ 68#endif 69#ifndef TDMA_BINTVAL_DEFAULT 70#define TDMA_BINTVAL_DEFAULT 5 /* 5x ~= 100TU beacon intvl */ 71#endif 72#ifndef TDMA_TXRATE_11B_DEFAULT 73#define TDMA_TXRATE_11B_DEFAULT 2*11 74#endif 75#ifndef TDMA_TXRATE_11G_DEFAULT 76#define TDMA_TXRATE_11G_DEFAULT 2*24 77#endif 78#ifndef TDMA_TXRATE_11A_DEFAULT 79#define TDMA_TXRATE_11A_DEFAULT 2*24 80#endif 81#ifndef TDMA_TXRATE_TURBO_DEFAULT 82#define TDMA_TXRATE_TURBO_DEFAULT 2*24 83#endif 84#ifndef TDMA_TXRATE_HALF_DEFAULT 85#define TDMA_TXRATE_HALF_DEFAULT 2*12 86#endif 87#ifndef TDMA_TXRATE_QUARTER_DEFAULT 88#define TDMA_TXRATE_QUARTER_DEFAULT 2*6 89#endif 90#ifndef TDMA_TXRATE_11NA_DEFAULT 91#define TDMA_TXRATE_11NA_DEFAULT (4 | IEEE80211_RATE_MCS) 92#endif 93#ifndef TDMA_TXRATE_11NG_DEFAULT 94#define TDMA_TXRATE_11NG_DEFAULT (4 | IEEE80211_RATE_MCS) 95#endif 96 97#define TDMA_VERSION_VALID(_version) \ 98 (TDMA_VERSION_V2 <= (_version) && (_version) <= TDMA_VERSION) 99#define TDMA_SLOTCNT_VALID(_slotcnt) \ 100 (2 <= (_slotcnt) && (_slotcnt) <= TDMA_MAXSLOTS) 101/* XXX magic constants */ 102#define TDMA_SLOTLEN_VALID(_slotlen) \ 103 (2*100 <= (_slotlen) && (unsigned)(_slotlen) <= 0xfffff) 104/* XXX probably should set a max */ 105#define TDMA_BINTVAL_VALID(_bintval) (1 <= (_bintval)) 106 107/* 108 * This code is not prepared to handle more than 2 slots. 109 */ 110CTASSERT(TDMA_MAXSLOTS == 2); 111 112static void tdma_vdetach(struct ieee80211vap *vap); 113static int tdma_newstate(struct ieee80211vap *, enum ieee80211_state, int); 114static void tdma_beacon_miss(struct ieee80211vap *vap); 115static void tdma_recv_mgmt(struct ieee80211_node *, struct mbuf *, 116 int subtype, int rssi, int nf); 117static int tdma_update(struct ieee80211vap *vap, 118 const struct ieee80211_tdma_param *tdma, struct ieee80211_node *ni, 119 int pickslot); 120static int tdma_process_params(struct ieee80211_node *ni, 121 const u_int8_t *ie, int rssi, int nf, const struct ieee80211_frame *wh); 122 123static void 124settxparms(struct ieee80211vap *vap, enum ieee80211_phymode mode, int rate) 125{ 126 vap->iv_txparms[mode].ucastrate = rate; 127 vap->iv_txparms[mode].mcastrate = rate; 128} 129 130static void 131setackpolicy(struct ieee80211com *ic, int noack) 132{ 133 struct ieee80211_wme_state *wme = &ic->ic_wme; 134 int ac; 135 136 for (ac = 0; ac < WME_NUM_AC; ac++) { 137 wme->wme_chanParams.cap_wmeParams[ac].wmep_noackPolicy = noack; 138 wme->wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy = noack; 139 } 140} 141 142void 143ieee80211_tdma_vattach(struct ieee80211vap *vap) 144{ 145 struct ieee80211_tdma_state *ts; 146 147 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 148 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 149 150 ts = (struct ieee80211_tdma_state *) malloc( 151 sizeof(struct ieee80211_tdma_state), M_80211_VAP, M_NOWAIT | M_ZERO); 152 if (ts == NULL) { 153 printf("%s: cannot allocate TDMA state block\n", __func__); 154 /* NB: fall back to adhdemo mode */ 155 vap->iv_caps &= ~IEEE80211_C_TDMA; 156 return; 157 } 158 /* NB: default configuration is passive so no beacons */ 159 ts->tdma_version = TDMA_VERSION; 160 ts->tdma_slotlen = TDMA_SLOTLEN_DEFAULT; 161 ts->tdma_slotcnt = TDMA_SLOTCNT_DEFAULT; 162 ts->tdma_bintval = TDMA_BINTVAL_DEFAULT; 163 ts->tdma_slot = 1; /* passive operation */ 164 165 /* setup default fixed rates */ 166 settxparms(vap, IEEE80211_MODE_11A, TDMA_TXRATE_11A_DEFAULT); 167 settxparms(vap, IEEE80211_MODE_11B, TDMA_TXRATE_11B_DEFAULT); 168 settxparms(vap, IEEE80211_MODE_11G, TDMA_TXRATE_11G_DEFAULT); 169 settxparms(vap, IEEE80211_MODE_TURBO_A, TDMA_TXRATE_TURBO_DEFAULT); 170 settxparms(vap, IEEE80211_MODE_TURBO_G, TDMA_TXRATE_TURBO_DEFAULT); 171 settxparms(vap, IEEE80211_MODE_STURBO_A, TDMA_TXRATE_TURBO_DEFAULT); 172 settxparms(vap, IEEE80211_MODE_11NA, TDMA_TXRATE_11NA_DEFAULT); 173 settxparms(vap, IEEE80211_MODE_11NG, TDMA_TXRATE_11NG_DEFAULT); 174 settxparms(vap, IEEE80211_MODE_HALF, TDMA_TXRATE_HALF_DEFAULT); 175 settxparms(vap, IEEE80211_MODE_QUARTER, TDMA_TXRATE_QUARTER_DEFAULT); 176 177 setackpolicy(vap->iv_ic, 1); /* disable ACK's */ 178 179 ts->tdma_opdetach = vap->iv_opdetach; 180 vap->iv_opdetach = tdma_vdetach; 181 ts->tdma_newstate = vap->iv_newstate; 182 vap->iv_newstate = tdma_newstate; 183 vap->iv_bmiss = tdma_beacon_miss; 184 ts->tdma_recv_mgmt = vap->iv_recv_mgmt; 185 vap->iv_recv_mgmt = tdma_recv_mgmt; 186 187 vap->iv_tdma = ts; 188} 189 190static void 191tdma_vdetach(struct ieee80211vap *vap) 192{ 193 struct ieee80211_tdma_state *ts = vap->iv_tdma; 194 195 if (ts == NULL) { 196 /* NB: should not have touched any ic state */ 197 return; 198 } 199 ts->tdma_opdetach(vap); 200 free(vap->iv_tdma, M_80211_VAP); 201 vap->iv_tdma = NULL; 202 203 setackpolicy(vap->iv_ic, 0); /* enable ACK's */ 204} 205 206static void 207sta_leave(void *arg, struct ieee80211_node *ni) 208{ 209 struct ieee80211vap *vap = arg; 210 211 if (ni->ni_vap == vap && ni != vap->iv_bss) 212 ieee80211_node_leave(ni); 213} 214 215/* 216 * TDMA state machine handler. 217 */ 218static int 219tdma_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 220{ 221 struct ieee80211_tdma_state *ts = vap->iv_tdma; 222 struct ieee80211com *ic = vap->iv_ic; 223 enum ieee80211_state ostate; 224 int status; 225 226 IEEE80211_LOCK_ASSERT(ic); 227 228 ostate = vap->iv_state; 229 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 230 __func__, ieee80211_state_name[ostate], 231 ieee80211_state_name[nstate], arg); 232 233 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 234 callout_stop(&vap->iv_swbmiss); 235 if (nstate == IEEE80211_S_SCAN && 236 (ostate == IEEE80211_S_INIT || ostate == IEEE80211_S_RUN) && 237 ts->tdma_slot != 0) { 238 /* 239 * Override adhoc behaviour when operating as a slave; 240 * we need to scan even if the channel is locked. 241 */ 242 vap->iv_state = nstate; /* state transition */ 243 ieee80211_cancel_scan(vap); /* background scan */ 244 if (ostate == IEEE80211_S_RUN) { 245 /* purge station table; entries are stale */ 246 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 247 } 248 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 249 ieee80211_check_scan(vap, 250 vap->iv_scanreq_flags, 251 vap->iv_scanreq_duration, 252 vap->iv_scanreq_mindwell, 253 vap->iv_scanreq_maxdwell, 254 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 255 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 256 } else 257 ieee80211_check_scan_current(vap); 258 status = 0; 259 } else { 260 status = ts->tdma_newstate(vap, nstate, arg); 261 } 262 if (status == 0 && 263 nstate == IEEE80211_S_RUN && ostate != IEEE80211_S_RUN && 264 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) && 265 ts->tdma_slot != 0 && 266 vap->iv_des_chan == IEEE80211_CHAN_ANYC) { 267 /* 268 * Start s/w beacon miss timer for slave devices w/o 269 * hardware support. Note we do this only if we're 270 * not locked to a channel (i.e. roam to follow the 271 * master). The 2x is a fudge for our doing this in 272 * software. 273 */ 274 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 275 2 * vap->iv_bmissthreshold * ts->tdma_bintval * 276 ((ts->tdma_slotcnt * ts->tdma_slotlen) / 1024)); 277 vap->iv_swbmiss_count = 0; 278 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 279 ieee80211_swbmiss, vap); 280 } 281 return status; 282} 283 284static void 285tdma_beacon_miss(struct ieee80211vap *vap) 286{ 287 struct ieee80211_tdma_state *ts = vap->iv_tdma; 288 289 KASSERT((vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 290 KASSERT(vap->iv_state == IEEE80211_S_RUN, 291 ("wrong state %d", vap->iv_state)); 292 293 IEEE80211_DPRINTF(vap, 294 IEEE80211_MSG_STATE | IEEE80211_MSG_TDMA | IEEE80211_MSG_DEBUG, 295 "beacon miss, mode %u state %s\n", 296 vap->iv_opmode, ieee80211_state_name[vap->iv_state]); 297 298 if (ts->tdma_peer != NULL) { /* XXX? can this be null? */ 299 ieee80211_notify_node_leave(vap->iv_bss); 300 ts->tdma_peer = NULL; 301 /* 302 * Treat beacon miss like an associate failure wrt the 303 * scan policy; this forces the entry in the scan cache 304 * to be ignored after several tries. 305 */ 306 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, 307 IEEE80211_STATUS_TIMEOUT); 308 } 309#if 0 310 ts->tdma_inuse = 0; /* clear slot usage */ 311#endif 312 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 313} 314 315static void 316tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 317 int subtype, int rssi, int nf) 318{ 319 struct ieee80211com *ic = ni->ni_ic; 320 struct ieee80211vap *vap = ni->ni_vap; 321 struct ieee80211_tdma_state *ts = vap->iv_tdma; 322 323 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON && 324 (ic->ic_flags & IEEE80211_F_SCAN) == 0) { 325 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *); 326 struct ieee80211_scanparams scan; 327 328 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 329 return; 330 if (scan.tdma == NULL) { 331 /* 332 * TDMA stations must beacon a TDMA ie; ignore 333 * any other station. 334 * XXX detect overlapping bss and change channel 335 */ 336 IEEE80211_DISCARD(vap, 337 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 338 wh, ieee80211_mgt_subtype_name[subtype >> 339 IEEE80211_FC0_SUBTYPE_SHIFT], 340 "%s", "no TDMA ie"); 341 vap->iv_stats.is_rx_mgtdiscard++; 342 return; 343 } 344 if (ni == vap->iv_bss && 345 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 346 /* 347 * Fake up a node for this newly 348 * discovered member of the IBSS. 349 */ 350 ni = ieee80211_add_neighbor(vap, wh, &scan); 351 if (ni == NULL) { 352 /* NB: stat kept for alloc failure */ 353 return; 354 } 355 } 356 /* 357 * Check for state updates. 358 */ 359 if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) { 360 /* 361 * Count frame now that we know it's to be processed. 362 */ 363 vap->iv_stats.is_rx_beacon++; 364 IEEE80211_NODE_STAT(ni, rx_beacons); 365 /* 366 * Record tsf of last beacon. NB: this must be 367 * done before calling tdma_process_params 368 * as deeper routines reference it. 369 */ 370 memcpy(&ni->ni_tstamp.data, scan.tstamp, 371 sizeof(ni->ni_tstamp.data)); 372 /* 373 * Count beacon frame for s/w bmiss handling. 374 */ 375 vap->iv_swbmiss_count++; 376 /* 377 * Process tdma ie. The contents are used to sync 378 * the slot timing, reconfigure the bss, etc. 379 */ 380 (void) tdma_process_params(ni, scan.tdma, rssi, nf, wh); 381 return; 382 } 383 /* 384 * NB: defer remaining work to the adhoc code; this causes 385 * 2x parsing of the frame but should happen infrequently 386 */ 387 } 388 ts->tdma_recv_mgmt(ni, m0, subtype, rssi, nf); 389} 390 391/* 392 * Update TDMA state on receipt of a beacon frame with 393 * a TDMA information element. The sender's identity 394 * is provided so we can track who our peer is. If pickslot 395 * is non-zero we scan the slot allocation state in the ie 396 * to locate a free slot for our use. 397 */ 398static int 399tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma, 400 struct ieee80211_node *ni, int pickslot) 401{ 402 struct ieee80211_tdma_state *ts = vap->iv_tdma; 403 int slot, slotlen, update; 404 405 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 406 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 407 408 update = 0; 409 if (tdma->tdma_slotcnt != ts->tdma_slotcnt) { 410 if (!TDMA_SLOTCNT_VALID(tdma->tdma_slotcnt)) { 411 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1)) 412 printf("%s: bad slot cnt %u\n", 413 __func__, tdma->tdma_slotcnt); 414 return 0; 415 } 416 update |= TDMA_UPDATE_SLOTCNT; 417 } 418 slotlen = le16toh(tdma->tdma_slotlen) * 100; 419 if (slotlen != ts->tdma_slotlen) { 420 if (!TDMA_SLOTLEN_VALID(slotlen)) { 421 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1)) 422 printf("%s: bad slot len %u\n", 423 __func__, slotlen); 424 return 0; 425 } 426 update |= TDMA_UPDATE_SLOTLEN; 427 } 428 if (tdma->tdma_bintval != ts->tdma_bintval) { 429 if (!TDMA_BINTVAL_VALID(tdma->tdma_bintval)) { 430 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1)) 431 printf("%s: bad beacon interval %u\n", 432 __func__, tdma->tdma_bintval); 433 return 0; 434 } 435 update |= TDMA_UPDATE_BINTVAL; 436 } 437 slot = ts->tdma_slot; 438 if (pickslot) { 439 /* 440 * Pick unoccupied slot. Note we never choose slot 0. 441 */ 442 for (slot = tdma->tdma_slotcnt-1; slot > 0; slot--) 443 if (isclr(tdma->tdma_inuse, slot)) 444 break; 445 if (slot <= 0) { 446 printf("%s: no free slot, slotcnt %u inuse: 0x%x\n", 447 __func__, tdma->tdma_slotcnt, 448 tdma->tdma_inuse[0]); 449 /* XXX need to do something better */ 450 return 0; 451 } 452 if (slot != ts->tdma_slot) 453 update |= TDMA_UPDATE_SLOT; 454 } 455 if (ni != ts->tdma_peer) { 456 /* update everything */ 457 update = TDMA_UPDATE_SLOT 458 | TDMA_UPDATE_SLOTCNT 459 | TDMA_UPDATE_SLOTLEN 460 | TDMA_UPDATE_BINTVAL; 461 } 462 463 if (update) { 464 /* 465 * New/changed parameters; update runtime state. 466 */ 467 /* XXX overwrites user parameters */ 468 if (update & TDMA_UPDATE_SLOTCNT) 469 ts->tdma_slotcnt = tdma->tdma_slotcnt; 470 if (update & TDMA_UPDATE_SLOTLEN) 471 ts->tdma_slotlen = slotlen; 472 if (update & TDMA_UPDATE_SLOT) 473 ts->tdma_slot = slot; 474 if (update & TDMA_UPDATE_BINTVAL) 475 ts->tdma_bintval = tdma->tdma_bintval; 476 /* mark beacon to be updated before next xmit */ 477 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA); 478 479 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, 480 "%s: slot %u slotcnt %u slotlen %u us bintval %u\n", 481 __func__, ts->tdma_slot, ts->tdma_slotcnt, 482 ts->tdma_slotlen, ts->tdma_bintval); 483 } 484 /* 485 * Notify driver. Note we can be called before 486 * entering RUN state if we scanned and are 487 * joining an existing bss. In that case do not 488 * call the driver because not all necessary state 489 * has been setup. The next beacon will dtrt. 490 */ 491 if (vap->iv_state == IEEE80211_S_RUN) 492 vap->iv_ic->ic_tdma_update(ni, tdma, update); 493 /* 494 * Dispatch join event on first beacon from new master. 495 */ 496 if (ts->tdma_peer != ni) { 497 if (ts->tdma_peer != NULL) 498 ieee80211_notify_node_leave(vap->iv_bss); 499 ieee80211_notify_node_join(ni, 1); 500 /* NB: no reference, we just use the address */ 501 ts->tdma_peer = ni; 502 } 503 return 1; 504} 505 506/* 507 * Process received TDMA parameters. 508 */ 509static int 510tdma_process_params(struct ieee80211_node *ni, const u_int8_t *ie, 511 int rssi, int nf, const struct ieee80211_frame *wh) 512{ 513 struct ieee80211vap *vap = ni->ni_vap; 514 struct ieee80211_tdma_state *ts = vap->iv_tdma; 515 const struct ieee80211_tdma_param *tdma = 516 (const struct ieee80211_tdma_param *) ie; 517 u_int len = ie[1]; 518 519 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 520 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 521 522 if (len < sizeof(*tdma) - 2) { 523 IEEE80211_DISCARD_IE(vap, 524 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 525 wh, "tdma", "too short, len %u", len); 526 return IEEE80211_REASON_IE_INVALID; 527 } 528 if (tdma->tdma_version != ts->tdma_version) { 529 IEEE80211_DISCARD_IE(vap, 530 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 531 wh, "tdma", "bad version %u (ours %u)", 532 tdma->tdma_version, ts->tdma_version); 533 return IEEE80211_REASON_IE_INVALID; 534 } 535 /* 536 * NB: ideally we'd check against tdma_slotcnt, but that 537 * would require extra effort so do this easy check that 538 * covers the work below; more stringent checks are done 539 * before we make more extensive use of the ie contents. 540 */ 541 if (tdma->tdma_slot >= TDMA_MAXSLOTS) { 542 IEEE80211_DISCARD_IE(vap, 543 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 544 wh, "tdma", "invalid slot %u", tdma->tdma_slot); 545 return IEEE80211_REASON_IE_INVALID; 546 } 547 /* 548 * Can reach here while scanning, update 549 * operational state only in RUN state. 550 */ 551 if (vap->iv_state == IEEE80211_S_RUN) { 552 if (tdma->tdma_slot != ts->tdma_slot && 553 isclr(ts->tdma_inuse, tdma->tdma_slot)) { 554 IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni, 555 "discovered in slot %u", tdma->tdma_slot); 556 setbit(ts->tdma_inuse, tdma->tdma_slot); 557 /* XXX dispatch event only when operating as master */ 558 if (ts->tdma_slot == 0) 559 ieee80211_notify_node_join(ni, 1); 560 } 561 setbit(ts->tdma_active, tdma->tdma_slot); 562 if (tdma->tdma_slot == ts->tdma_slot-1) { 563 /* 564 * Slave tsf synchronization to station 565 * just before us in the schedule. The driver 566 * is responsible for copying the timestamp 567 * of the received beacon into our beacon 568 * frame so the sender can calculate round 569 * trip time. We cannot do that here because 570 * we don't know how to update our beacon frame. 571 */ 572 (void) tdma_update(vap, tdma, ni, 0); 573 /* XXX reschedule swbmiss timer on parameter change */ 574 } else if (tdma->tdma_slot == ts->tdma_slot+1) { 575 uint64_t tstamp; 576#if 0 577 uint32_t rstamp = (uint32_t) le64toh(rs->tsf); 578 int32_t rtt; 579#endif 580 /* 581 * Use returned timstamp to calculate the 582 * roundtrip time. 583 */ 584 memcpy(&tstamp, tdma->tdma_tstamp, 8); 585#if 0 586 /* XXX use only 15 bits of rstamp */ 587 rtt = rstamp - (le64toh(tstamp) & 0x7fff); 588 if (rtt < 0) 589 rtt += 0x7fff; 590 /* XXX hack to quiet normal use */ 591 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X, 592 "tdma rtt %5u [rstamp %5u tstamp %llu]\n", 593 rtt, rstamp, 594 (unsigned long long) le64toh(tstamp)); 595#endif 596 } else if (tdma->tdma_slot == ts->tdma_slot && 597 le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) { 598 /* 599 * Station using the same slot as us and has 600 * been around longer than us; we must move. 601 * Note this can happen if stations do not 602 * see each other while scanning. 603 */ 604 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, 605 "slot %u collision rxtsf %llu tsf %llu\n", 606 tdma->tdma_slot, 607 (unsigned long long) le64toh(ni->ni_tstamp.tsf), 608 vap->iv_bss->ni_tstamp.tsf); 609 setbit(ts->tdma_inuse, tdma->tdma_slot); 610 611 (void) tdma_update(vap, tdma, ni, 1); 612 } 613 } 614 return 0; 615} 616 617int 618ieee80211_tdma_getslot(struct ieee80211vap *vap) 619{ 620 struct ieee80211_tdma_state *ts = vap->iv_tdma; 621 622 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 623 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 624 return ts->tdma_slot; 625} 626 627/* 628 * Parse a TDMA ie on station join and use it to setup node state. 629 */ 630void 631ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie) 632{ 633 struct ieee80211vap *vap = ni->ni_vap; 634 635 if (vap->iv_caps & IEEE80211_C_TDMA) { 636 const struct ieee80211_tdma_param *tdma = 637 (const struct ieee80211_tdma_param *)ie; 638 struct ieee80211_tdma_state *ts = vap->iv_tdma; 639 /* 640 * Adopt TDMA configuration when joining an 641 * existing network. 642 */ 643 setbit(ts->tdma_inuse, tdma->tdma_slot); 644 (void) tdma_update(vap, tdma, ni, 1); 645 /* 646 * Propagate capabilities based on the local 647 * configuration and the remote station's advertised 648 * capabilities. In particular this permits us to 649 * enable use of QoS to disable ACK's. 650 */ 651 if ((vap->iv_flags & IEEE80211_F_WME) && 652 ni->ni_ies.wme_ie != NULL) 653 ni->ni_flags |= IEEE80211_NODE_QOS; 654 } 655} 656 657#define TDMA_OUI_BYTES 0x00, 0x03, 0x7f 658/* 659 * Add a TDMA parameters element to a frame. 660 */ 661uint8_t * 662ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap) 663{ 664#define ADDSHORT(frm, v) do { \ 665 frm[0] = (v) & 0xff; \ 666 frm[1] = (v) >> 8; \ 667 frm += 2; \ 668} while (0) 669 static const struct ieee80211_tdma_param param = { 670 .tdma_id = IEEE80211_ELEMID_VENDOR, 671 .tdma_len = sizeof(struct ieee80211_tdma_param) - 2, 672 .tdma_oui = { TDMA_OUI_BYTES }, 673 .tdma_type = TDMA_OUI_TYPE, 674 .tdma_subtype = TDMA_SUBTYPE_PARAM, 675 .tdma_version = TDMA_VERSION, 676 }; 677 const struct ieee80211_tdma_state *ts = vap->iv_tdma; 678 uint16_t slotlen; 679 680 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 681 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 682 683 memcpy(frm, ¶m, sizeof(param)); 684 frm += __offsetof(struct ieee80211_tdma_param, tdma_slot); 685 *frm++ = ts->tdma_slot; 686 *frm++ = ts->tdma_slotcnt; 687 /* NB: convert units to fit in 16-bits */ 688 slotlen = ts->tdma_slotlen / 100; /* 100us units */ 689 ADDSHORT(frm, slotlen); 690 *frm++ = ts->tdma_bintval; 691 *frm++ = ts->tdma_inuse[0]; 692 frm += 10; /* pad+timestamp */ 693 return frm; 694#undef ADDSHORT 695} 696#undef TDMA_OUI_BYTES 697 698/* 699 * Update TDMA state at TBTT. 700 */ 701void 702ieee80211_tdma_update_beacon(struct ieee80211vap *vap, 703 struct ieee80211_beacon_offsets *bo) 704{ 705 struct ieee80211_tdma_state *ts = vap->iv_tdma; 706 707 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 708 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 709 710 if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) { 711 (void) ieee80211_add_tdma(bo->bo_tdma, vap); 712 clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA); 713 } 714 if (ts->tdma_slot != 0) /* only on master */ 715 return; 716 if (ts->tdma_count <= 0) { 717 /* 718 * Time to update the mask of active/inuse stations. 719 * We track stations that we've received a beacon 720 * frame from and update this mask periodically. 721 * This allows us to miss a few beacons before marking 722 * a slot free for re-use. 723 */ 724 ts->tdma_inuse[0] = ts->tdma_active[0]; 725 ts->tdma_active[0] = 0x01; 726 /* update next time 'round */ 727 /* XXX use notify framework */ 728 setbit(bo->bo_flags, IEEE80211_BEACON_TDMA); 729 /* NB: use s/w beacon miss threshold; may be too high */ 730 ts->tdma_count = vap->iv_bmissthreshold-1; 731 } else 732 ts->tdma_count--; 733} 734 735static int 736tdma_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 737{ 738 struct ieee80211_tdma_state *ts = vap->iv_tdma; 739 740 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) 741 return EOPNOTSUPP; 742 743 switch (ireq->i_type) { 744 case IEEE80211_IOC_TDMA_SLOT: 745 ireq->i_val = ts->tdma_slot; 746 break; 747 case IEEE80211_IOC_TDMA_SLOTCNT: 748 ireq->i_val = ts->tdma_slotcnt; 749 break; 750 case IEEE80211_IOC_TDMA_SLOTLEN: 751 ireq->i_val = ts->tdma_slotlen; 752 break; 753 case IEEE80211_IOC_TDMA_BINTERVAL: 754 ireq->i_val = ts->tdma_bintval; 755 break; 756 default: 757 return ENOSYS; 758 } 759 return 0; 760} 761IEEE80211_IOCTL_GET(tdma, tdma_ioctl_get80211); 762 763static int 764tdma_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 765{ 766 struct ieee80211_tdma_state *ts = vap->iv_tdma; 767 768 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) 769 return EOPNOTSUPP; 770 771 switch (ireq->i_type) { 772 case IEEE80211_IOC_TDMA_SLOT: 773 if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt)) 774 return EINVAL; 775 if (ireq->i_val != ts->tdma_slot) { 776 ts->tdma_slot = ireq->i_val; 777 goto restart; 778 } 779 break; 780 case IEEE80211_IOC_TDMA_SLOTCNT: 781 if (!TDMA_SLOTCNT_VALID(ireq->i_val)) 782 return EINVAL; 783 if (ireq->i_val != ts->tdma_slotcnt) { 784 ts->tdma_slotcnt = ireq->i_val; 785 goto restart; 786 } 787 break; 788 case IEEE80211_IOC_TDMA_SLOTLEN: 789 /* 790 * XXX 791 * 150 insures at least 1/8 TU 792 * 0xfffff is the max duration for bursting 793 * (implict by way of 16-bit data type for i_val) 794 */ 795 if (!TDMA_SLOTLEN_VALID(ireq->i_val)) 796 return EINVAL; 797 if (ireq->i_val != ts->tdma_slotlen) { 798 ts->tdma_slotlen = ireq->i_val; 799 goto restart; 800 } 801 break; 802 case IEEE80211_IOC_TDMA_BINTERVAL: 803 if (!TDMA_BINTVAL_VALID(ireq->i_val)) 804 return EINVAL; 805 if (ireq->i_val != ts->tdma_bintval) { 806 ts->tdma_bintval = ireq->i_val; 807 goto restart; 808 } 809 break; 810 default: 811 return ENOSYS; 812 } 813 return 0; 814restart: 815 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA); 816 return ERESTART; 817} 818IEEE80211_IOCTL_SET(tdma, tdma_ioctl_set80211); 819