ieee80211_tdma.c revision 205140
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 205140 2010-03-14 01:57:32Z weongyo $"); 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 callout_stop(&vap->iv_swbmiss); 299 300 if (ts->tdma_peer != NULL) { /* XXX? can this be null? */ 301 ieee80211_notify_node_leave(vap->iv_bss); 302 ts->tdma_peer = NULL; 303 /* 304 * Treat beacon miss like an associate failure wrt the 305 * scan policy; this forces the entry in the scan cache 306 * to be ignored after several tries. 307 */ 308 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, 309 IEEE80211_STATUS_TIMEOUT); 310 } 311#if 0 312 ts->tdma_inuse = 0; /* clear slot usage */ 313#endif 314 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 315} 316 317static void 318tdma_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 319 int subtype, int rssi, int nf) 320{ 321 struct ieee80211com *ic = ni->ni_ic; 322 struct ieee80211vap *vap = ni->ni_vap; 323 struct ieee80211_tdma_state *ts = vap->iv_tdma; 324 325 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON && 326 (ic->ic_flags & IEEE80211_F_SCAN) == 0) { 327 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *); 328 struct ieee80211_scanparams scan; 329 330 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 331 return; 332 if (scan.tdma == NULL) { 333 /* 334 * TDMA stations must beacon a TDMA ie; ignore 335 * any other station. 336 * XXX detect overlapping bss and change channel 337 */ 338 IEEE80211_DISCARD(vap, 339 IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 340 wh, ieee80211_mgt_subtype_name[subtype >> 341 IEEE80211_FC0_SUBTYPE_SHIFT], 342 "%s", "no TDMA ie"); 343 vap->iv_stats.is_rx_mgtdiscard++; 344 return; 345 } 346 if (ni == vap->iv_bss && 347 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 348 /* 349 * Fake up a node for this newly 350 * discovered member of the IBSS. 351 */ 352 ni = ieee80211_add_neighbor(vap, wh, &scan); 353 if (ni == NULL) { 354 /* NB: stat kept for alloc failure */ 355 return; 356 } 357 } 358 /* 359 * Check for state updates. 360 */ 361 if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) { 362 /* 363 * Count frame now that we know it's to be processed. 364 */ 365 vap->iv_stats.is_rx_beacon++; 366 IEEE80211_NODE_STAT(ni, rx_beacons); 367 /* 368 * Record tsf of last beacon. NB: this must be 369 * done before calling tdma_process_params 370 * as deeper routines reference it. 371 */ 372 memcpy(&ni->ni_tstamp.data, scan.tstamp, 373 sizeof(ni->ni_tstamp.data)); 374 /* 375 * Count beacon frame for s/w bmiss handling. 376 */ 377 vap->iv_swbmiss_count++; 378 /* 379 * Process tdma ie. The contents are used to sync 380 * the slot timing, reconfigure the bss, etc. 381 */ 382 (void) tdma_process_params(ni, scan.tdma, rssi, nf, wh); 383 return; 384 } 385 /* 386 * NB: defer remaining work to the adhoc code; this causes 387 * 2x parsing of the frame but should happen infrequently 388 */ 389 } 390 ts->tdma_recv_mgmt(ni, m0, subtype, rssi, nf); 391} 392 393/* 394 * Update TDMA state on receipt of a beacon frame with 395 * a TDMA information element. The sender's identity 396 * is provided so we can track who our peer is. If pickslot 397 * is non-zero we scan the slot allocation state in the ie 398 * to locate a free slot for our use. 399 */ 400static int 401tdma_update(struct ieee80211vap *vap, const struct ieee80211_tdma_param *tdma, 402 struct ieee80211_node *ni, int pickslot) 403{ 404 struct ieee80211_tdma_state *ts = vap->iv_tdma; 405 int slot, slotlen, update; 406 407 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 408 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 409 410 update = 0; 411 if (tdma->tdma_slotcnt != ts->tdma_slotcnt) { 412 if (!TDMA_SLOTCNT_VALID(tdma->tdma_slotcnt)) { 413 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1)) 414 printf("%s: bad slot cnt %u\n", 415 __func__, tdma->tdma_slotcnt); 416 return 0; 417 } 418 update |= TDMA_UPDATE_SLOTCNT; 419 } 420 slotlen = le16toh(tdma->tdma_slotlen) * 100; 421 if (slotlen != ts->tdma_slotlen) { 422 if (!TDMA_SLOTLEN_VALID(slotlen)) { 423 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1)) 424 printf("%s: bad slot len %u\n", 425 __func__, slotlen); 426 return 0; 427 } 428 update |= TDMA_UPDATE_SLOTLEN; 429 } 430 if (tdma->tdma_bintval != ts->tdma_bintval) { 431 if (!TDMA_BINTVAL_VALID(tdma->tdma_bintval)) { 432 if (ppsratecheck(&ts->tdma_lastprint, &ts->tdma_fails, 1)) 433 printf("%s: bad beacon interval %u\n", 434 __func__, tdma->tdma_bintval); 435 return 0; 436 } 437 update |= TDMA_UPDATE_BINTVAL; 438 } 439 slot = ts->tdma_slot; 440 if (pickslot) { 441 /* 442 * Pick unoccupied slot. Note we never choose slot 0. 443 */ 444 for (slot = tdma->tdma_slotcnt-1; slot > 0; slot--) 445 if (isclr(tdma->tdma_inuse, slot)) 446 break; 447 if (slot <= 0) { 448 printf("%s: no free slot, slotcnt %u inuse: 0x%x\n", 449 __func__, tdma->tdma_slotcnt, 450 tdma->tdma_inuse[0]); 451 /* XXX need to do something better */ 452 return 0; 453 } 454 if (slot != ts->tdma_slot) 455 update |= TDMA_UPDATE_SLOT; 456 } 457 if (ni != ts->tdma_peer) { 458 /* update everything */ 459 update = TDMA_UPDATE_SLOT 460 | TDMA_UPDATE_SLOTCNT 461 | TDMA_UPDATE_SLOTLEN 462 | TDMA_UPDATE_BINTVAL; 463 } 464 465 if (update) { 466 /* 467 * New/changed parameters; update runtime state. 468 */ 469 /* XXX overwrites user parameters */ 470 if (update & TDMA_UPDATE_SLOTCNT) 471 ts->tdma_slotcnt = tdma->tdma_slotcnt; 472 if (update & TDMA_UPDATE_SLOTLEN) 473 ts->tdma_slotlen = slotlen; 474 if (update & TDMA_UPDATE_SLOT) 475 ts->tdma_slot = slot; 476 if (update & TDMA_UPDATE_BINTVAL) 477 ts->tdma_bintval = tdma->tdma_bintval; 478 /* mark beacon to be updated before next xmit */ 479 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA); 480 481 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, 482 "%s: slot %u slotcnt %u slotlen %u us bintval %u\n", 483 __func__, ts->tdma_slot, ts->tdma_slotcnt, 484 ts->tdma_slotlen, ts->tdma_bintval); 485 } 486 /* 487 * Notify driver. Note we can be called before 488 * entering RUN state if we scanned and are 489 * joining an existing bss. In that case do not 490 * call the driver because not all necessary state 491 * has been setup. The next beacon will dtrt. 492 */ 493 if (vap->iv_state == IEEE80211_S_RUN) 494 vap->iv_ic->ic_tdma_update(ni, tdma, update); 495 /* 496 * Dispatch join event on first beacon from new master. 497 */ 498 if (ts->tdma_peer != ni) { 499 if (ts->tdma_peer != NULL) 500 ieee80211_notify_node_leave(vap->iv_bss); 501 ieee80211_notify_node_join(ni, 1); 502 /* NB: no reference, we just use the address */ 503 ts->tdma_peer = ni; 504 } 505 return 1; 506} 507 508/* 509 * Process received TDMA parameters. 510 */ 511static int 512tdma_process_params(struct ieee80211_node *ni, const u_int8_t *ie, 513 int rssi, int nf, const struct ieee80211_frame *wh) 514{ 515 struct ieee80211vap *vap = ni->ni_vap; 516 struct ieee80211_tdma_state *ts = vap->iv_tdma; 517 const struct ieee80211_tdma_param *tdma = 518 (const struct ieee80211_tdma_param *) ie; 519 u_int len = ie[1]; 520 521 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 522 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 523 524 if (len < sizeof(*tdma) - 2) { 525 IEEE80211_DISCARD_IE(vap, 526 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 527 wh, "tdma", "too short, len %u", len); 528 return IEEE80211_REASON_IE_INVALID; 529 } 530 if (tdma->tdma_version != ts->tdma_version) { 531 IEEE80211_DISCARD_IE(vap, 532 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 533 wh, "tdma", "bad version %u (ours %u)", 534 tdma->tdma_version, ts->tdma_version); 535 return IEEE80211_REASON_IE_INVALID; 536 } 537 /* 538 * NB: ideally we'd check against tdma_slotcnt, but that 539 * would require extra effort so do this easy check that 540 * covers the work below; more stringent checks are done 541 * before we make more extensive use of the ie contents. 542 */ 543 if (tdma->tdma_slot >= TDMA_MAXSLOTS) { 544 IEEE80211_DISCARD_IE(vap, 545 IEEE80211_MSG_ELEMID | IEEE80211_MSG_TDMA, 546 wh, "tdma", "invalid slot %u", tdma->tdma_slot); 547 return IEEE80211_REASON_IE_INVALID; 548 } 549 /* 550 * Can reach here while scanning, update 551 * operational state only in RUN state. 552 */ 553 if (vap->iv_state == IEEE80211_S_RUN) { 554 if (tdma->tdma_slot != ts->tdma_slot && 555 isclr(ts->tdma_inuse, tdma->tdma_slot)) { 556 IEEE80211_NOTE(vap, IEEE80211_MSG_TDMA, ni, 557 "discovered in slot %u", tdma->tdma_slot); 558 setbit(ts->tdma_inuse, tdma->tdma_slot); 559 /* XXX dispatch event only when operating as master */ 560 if (ts->tdma_slot == 0) 561 ieee80211_notify_node_join(ni, 1); 562 } 563 setbit(ts->tdma_active, tdma->tdma_slot); 564 if (tdma->tdma_slot == ts->tdma_slot-1) { 565 /* 566 * Slave tsf synchronization to station 567 * just before us in the schedule. The driver 568 * is responsible for copying the timestamp 569 * of the received beacon into our beacon 570 * frame so the sender can calculate round 571 * trip time. We cannot do that here because 572 * we don't know how to update our beacon frame. 573 */ 574 (void) tdma_update(vap, tdma, ni, 0); 575 /* XXX reschedule swbmiss timer on parameter change */ 576 } else if (tdma->tdma_slot == ts->tdma_slot+1) { 577 uint64_t tstamp; 578#if 0 579 uint32_t rstamp = (uint32_t) le64toh(rs->tsf); 580 int32_t rtt; 581#endif 582 /* 583 * Use returned timstamp to calculate the 584 * roundtrip time. 585 */ 586 memcpy(&tstamp, tdma->tdma_tstamp, 8); 587#if 0 588 /* XXX use only 15 bits of rstamp */ 589 rtt = rstamp - (le64toh(tstamp) & 0x7fff); 590 if (rtt < 0) 591 rtt += 0x7fff; 592 /* XXX hack to quiet normal use */ 593 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DOT1X, 594 "tdma rtt %5u [rstamp %5u tstamp %llu]\n", 595 rtt, rstamp, 596 (unsigned long long) le64toh(tstamp)); 597#endif 598 } else if (tdma->tdma_slot == ts->tdma_slot && 599 le64toh(ni->ni_tstamp.tsf) > vap->iv_bss->ni_tstamp.tsf) { 600 /* 601 * Station using the same slot as us and has 602 * been around longer than us; we must move. 603 * Note this can happen if stations do not 604 * see each other while scanning. 605 */ 606 IEEE80211_DPRINTF(vap, IEEE80211_MSG_TDMA, 607 "slot %u collision rxtsf %llu tsf %llu\n", 608 tdma->tdma_slot, 609 (unsigned long long) le64toh(ni->ni_tstamp.tsf), 610 vap->iv_bss->ni_tstamp.tsf); 611 setbit(ts->tdma_inuse, tdma->tdma_slot); 612 613 (void) tdma_update(vap, tdma, ni, 1); 614 } 615 } 616 return 0; 617} 618 619int 620ieee80211_tdma_getslot(struct ieee80211vap *vap) 621{ 622 struct ieee80211_tdma_state *ts = vap->iv_tdma; 623 624 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 625 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 626 return ts->tdma_slot; 627} 628 629/* 630 * Parse a TDMA ie on station join and use it to setup node state. 631 */ 632void 633ieee80211_parse_tdma(struct ieee80211_node *ni, const uint8_t *ie) 634{ 635 struct ieee80211vap *vap = ni->ni_vap; 636 637 if (vap->iv_caps & IEEE80211_C_TDMA) { 638 const struct ieee80211_tdma_param *tdma = 639 (const struct ieee80211_tdma_param *)ie; 640 struct ieee80211_tdma_state *ts = vap->iv_tdma; 641 /* 642 * Adopt TDMA configuration when joining an 643 * existing network. 644 */ 645 setbit(ts->tdma_inuse, tdma->tdma_slot); 646 (void) tdma_update(vap, tdma, ni, 1); 647 /* 648 * Propagate capabilities based on the local 649 * configuration and the remote station's advertised 650 * capabilities. In particular this permits us to 651 * enable use of QoS to disable ACK's. 652 */ 653 if ((vap->iv_flags & IEEE80211_F_WME) && 654 ni->ni_ies.wme_ie != NULL) 655 ni->ni_flags |= IEEE80211_NODE_QOS; 656 } 657} 658 659#define TDMA_OUI_BYTES 0x00, 0x03, 0x7f 660/* 661 * Add a TDMA parameters element to a frame. 662 */ 663uint8_t * 664ieee80211_add_tdma(uint8_t *frm, struct ieee80211vap *vap) 665{ 666#define ADDSHORT(frm, v) do { \ 667 frm[0] = (v) & 0xff; \ 668 frm[1] = (v) >> 8; \ 669 frm += 2; \ 670} while (0) 671 static const struct ieee80211_tdma_param param = { 672 .tdma_id = IEEE80211_ELEMID_VENDOR, 673 .tdma_len = sizeof(struct ieee80211_tdma_param) - 2, 674 .tdma_oui = { TDMA_OUI_BYTES }, 675 .tdma_type = TDMA_OUI_TYPE, 676 .tdma_subtype = TDMA_SUBTYPE_PARAM, 677 .tdma_version = TDMA_VERSION, 678 }; 679 const struct ieee80211_tdma_state *ts = vap->iv_tdma; 680 uint16_t slotlen; 681 682 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 683 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 684 685 memcpy(frm, ¶m, sizeof(param)); 686 frm += __offsetof(struct ieee80211_tdma_param, tdma_slot); 687 *frm++ = ts->tdma_slot; 688 *frm++ = ts->tdma_slotcnt; 689 /* NB: convert units to fit in 16-bits */ 690 slotlen = ts->tdma_slotlen / 100; /* 100us units */ 691 ADDSHORT(frm, slotlen); 692 *frm++ = ts->tdma_bintval; 693 *frm++ = ts->tdma_inuse[0]; 694 frm += 10; /* pad+timestamp */ 695 return frm; 696#undef ADDSHORT 697} 698#undef TDMA_OUI_BYTES 699 700/* 701 * Update TDMA state at TBTT. 702 */ 703void 704ieee80211_tdma_update_beacon(struct ieee80211vap *vap, 705 struct ieee80211_beacon_offsets *bo) 706{ 707 struct ieee80211_tdma_state *ts = vap->iv_tdma; 708 709 KASSERT(vap->iv_caps & IEEE80211_C_TDMA, 710 ("not a tdma vap, caps 0x%x", vap->iv_caps)); 711 712 if (isset(bo->bo_flags, IEEE80211_BEACON_TDMA)) { 713 (void) ieee80211_add_tdma(bo->bo_tdma, vap); 714 clrbit(bo->bo_flags, IEEE80211_BEACON_TDMA); 715 } 716 if (ts->tdma_slot != 0) /* only on master */ 717 return; 718 if (ts->tdma_count <= 0) { 719 /* 720 * Time to update the mask of active/inuse stations. 721 * We track stations that we've received a beacon 722 * frame from and update this mask periodically. 723 * This allows us to miss a few beacons before marking 724 * a slot free for re-use. 725 */ 726 ts->tdma_inuse[0] = ts->tdma_active[0]; 727 ts->tdma_active[0] = 0x01; 728 /* update next time 'round */ 729 /* XXX use notify framework */ 730 setbit(bo->bo_flags, IEEE80211_BEACON_TDMA); 731 /* NB: use s/w beacon miss threshold; may be too high */ 732 ts->tdma_count = vap->iv_bmissthreshold-1; 733 } else 734 ts->tdma_count--; 735} 736 737static int 738tdma_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 739{ 740 struct ieee80211_tdma_state *ts = vap->iv_tdma; 741 742 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) 743 return EOPNOTSUPP; 744 745 switch (ireq->i_type) { 746 case IEEE80211_IOC_TDMA_SLOT: 747 ireq->i_val = ts->tdma_slot; 748 break; 749 case IEEE80211_IOC_TDMA_SLOTCNT: 750 ireq->i_val = ts->tdma_slotcnt; 751 break; 752 case IEEE80211_IOC_TDMA_SLOTLEN: 753 ireq->i_val = ts->tdma_slotlen; 754 break; 755 case IEEE80211_IOC_TDMA_BINTERVAL: 756 ireq->i_val = ts->tdma_bintval; 757 break; 758 default: 759 return ENOSYS; 760 } 761 return 0; 762} 763IEEE80211_IOCTL_GET(tdma, tdma_ioctl_get80211); 764 765static int 766tdma_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 767{ 768 struct ieee80211_tdma_state *ts = vap->iv_tdma; 769 770 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0) 771 return EOPNOTSUPP; 772 773 switch (ireq->i_type) { 774 case IEEE80211_IOC_TDMA_SLOT: 775 if (!(0 <= ireq->i_val && ireq->i_val <= ts->tdma_slotcnt)) 776 return EINVAL; 777 if (ireq->i_val != ts->tdma_slot) { 778 ts->tdma_slot = ireq->i_val; 779 goto restart; 780 } 781 break; 782 case IEEE80211_IOC_TDMA_SLOTCNT: 783 if (!TDMA_SLOTCNT_VALID(ireq->i_val)) 784 return EINVAL; 785 if (ireq->i_val != ts->tdma_slotcnt) { 786 ts->tdma_slotcnt = ireq->i_val; 787 goto restart; 788 } 789 break; 790 case IEEE80211_IOC_TDMA_SLOTLEN: 791 /* 792 * XXX 793 * 150 insures at least 1/8 TU 794 * 0xfffff is the max duration for bursting 795 * (implict by way of 16-bit data type for i_val) 796 */ 797 if (!TDMA_SLOTLEN_VALID(ireq->i_val)) 798 return EINVAL; 799 if (ireq->i_val != ts->tdma_slotlen) { 800 ts->tdma_slotlen = ireq->i_val; 801 goto restart; 802 } 803 break; 804 case IEEE80211_IOC_TDMA_BINTERVAL: 805 if (!TDMA_BINTVAL_VALID(ireq->i_val)) 806 return EINVAL; 807 if (ireq->i_val != ts->tdma_bintval) { 808 ts->tdma_bintval = ireq->i_val; 809 goto restart; 810 } 811 break; 812 default: 813 return ENOSYS; 814 } 815 return 0; 816restart: 817 ieee80211_beacon_notify(vap, IEEE80211_BEACON_TDMA); 818 return ERESTART; 819} 820IEEE80211_IOCTL_SET(tdma, tdma_ioctl_set80211); 821