ieee80211_ht.c revision 183256
1/*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27#ifdef __FreeBSD__ 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_ht.c 183256 2008-09-22 00:10:22Z sam $"); 29#endif 30 31/* 32 * IEEE 802.11n protocol support. 33 */ 34 35#include "opt_inet.h" 36#include "opt_wlan.h" 37 38#include <sys/param.h> 39#include <sys/kernel.h> 40#include <sys/systm.h> 41#include <sys/endian.h> 42 43#include <sys/socket.h> 44 45#include <net/if.h> 46#include <net/if_media.h> 47#include <net/ethernet.h> 48 49#include <net80211/ieee80211_var.h> 50#include <net80211/ieee80211_input.h> 51 52/* define here, used throughout file */ 53#define MS(_v, _f) (((_v) & _f) >> _f##_S) 54#define SM(_v, _f) (((_v) << _f##_S) & _f) 55 56const struct ieee80211_mcs_rates ieee80211_htrates[16] = { 57 { 13, 14, 27, 30 }, /* MCS 0 */ 58 { 26, 29, 54, 60 }, /* MCS 1 */ 59 { 39, 43, 81, 90 }, /* MCS 2 */ 60 { 52, 58, 108, 120 }, /* MCS 3 */ 61 { 78, 87, 162, 180 }, /* MCS 4 */ 62 { 104, 116, 216, 240 }, /* MCS 5 */ 63 { 117, 130, 243, 270 }, /* MCS 6 */ 64 { 130, 144, 270, 300 }, /* MCS 7 */ 65 { 26, 29, 54, 60 }, /* MCS 8 */ 66 { 52, 58, 108, 120 }, /* MCS 9 */ 67 { 78, 87, 162, 180 }, /* MCS 10 */ 68 { 104, 116, 216, 240 }, /* MCS 11 */ 69 { 156, 173, 324, 360 }, /* MCS 12 */ 70 { 208, 231, 432, 480 }, /* MCS 13 */ 71 { 234, 260, 486, 540 }, /* MCS 14 */ 72 { 260, 289, 540, 600 } /* MCS 15 */ 73}; 74 75static const struct ieee80211_htrateset ieee80211_rateset_11n = 76 { 16, { 77 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 78 10, 11, 12, 13, 14, 15 } 79 }; 80 81#ifdef IEEE80211_AMPDU_AGE 82/* XXX public for sysctl hookup */ 83int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 84#endif 85int ieee80211_recv_bar_ena = 1; 86int ieee80211_addba_timeout = -1; /* timeout waiting for ADDBA response */ 87int ieee80211_addba_backoff = -1; /* backoff after max ADDBA requests */ 88int ieee80211_addba_maxtries = 3; /* max ADDBA requests before backoff */ 89 90/* 91 * Setup HT parameters that depends on the clock frequency. 92 */ 93static void 94ieee80211_ht_setup(void) 95{ 96#ifdef IEEE80211_AMPDU_AGE 97 ieee80211_ampdu_age = msecs_to_ticks(500); 98#endif 99 ieee80211_addba_timeout = msecs_to_ticks(250); 100 ieee80211_addba_backoff = msecs_to_ticks(10*1000); 101} 102SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL); 103 104static int ieee80211_ampdu_enable(struct ieee80211_node *ni, 105 struct ieee80211_tx_ampdu *tap); 106static int ieee80211_addba_request(struct ieee80211_node *ni, 107 struct ieee80211_tx_ampdu *tap, 108 int dialogtoken, int baparamset, int batimeout); 109static int ieee80211_addba_response(struct ieee80211_node *ni, 110 struct ieee80211_tx_ampdu *tap, 111 int code, int baparamset, int batimeout); 112static void ieee80211_addba_stop(struct ieee80211_node *ni, 113 struct ieee80211_tx_ampdu *tap); 114static void ieee80211_aggr_recv_action(struct ieee80211_node *ni, 115 const uint8_t *frm, const uint8_t *efrm); 116 117void 118ieee80211_ht_attach(struct ieee80211com *ic) 119{ 120 /* setup default aggregation policy */ 121 ic->ic_recv_action = ieee80211_aggr_recv_action; 122 ic->ic_send_action = ieee80211_send_action; 123 ic->ic_ampdu_enable = ieee80211_ampdu_enable; 124 ic->ic_addba_request = ieee80211_addba_request; 125 ic->ic_addba_response = ieee80211_addba_response; 126 ic->ic_addba_stop = ieee80211_addba_stop; 127 128 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS; 129 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 130} 131 132void 133ieee80211_ht_detach(struct ieee80211com *ic) 134{ 135} 136 137void 138ieee80211_ht_vattach(struct ieee80211vap *vap) 139{ 140 141 /* driver can override defaults */ 142 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 143 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 144 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax; 145 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU; 146 /* tx aggregation traffic thresholds */ 147 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128; 148 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64; 149 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32; 150 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32; 151 152 if (vap->iv_htcaps & IEEE80211_HTC_HT) { 153 /* 154 * Device is HT capable; enable all HT-related 155 * facilities by default. 156 * XXX these choices may be too aggressive. 157 */ 158 vap->iv_flags_ext |= IEEE80211_FEXT_HT 159 | IEEE80211_FEXT_HTCOMPAT 160 ; 161 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20) 162 vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI20; 163 /* XXX infer from channel list? */ 164 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 165 vap->iv_flags_ext |= IEEE80211_FEXT_USEHT40; 166 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40) 167 vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI40; 168 } 169 /* enable RIFS if capable */ 170 if (vap->iv_htcaps & IEEE80211_HTC_RIFS) 171 vap->iv_flags_ext |= IEEE80211_FEXT_RIFS; 172 173 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 174 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_RX; 175 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU) 176 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_TX; 177 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_RX; 178 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU) 179 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_TX; 180 } 181 /* NB: disable default legacy WDS, too many issues right now */ 182 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) 183 vap->iv_flags_ext &= ~IEEE80211_FEXT_HT; 184} 185 186void 187ieee80211_ht_vdetach(struct ieee80211vap *vap) 188{ 189} 190 191static void 192ht_announce(struct ieee80211com *ic, int mode, 193 const struct ieee80211_htrateset *rs) 194{ 195 struct ifnet *ifp = ic->ic_ifp; 196 int i, rate, mword; 197 198 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]); 199 for (i = 0; i < rs->rs_nrates; i++) { 200 mword = ieee80211_rate2media(ic, 201 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode); 202 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 203 continue; 204 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns; 205 printf("%s%d%sMbps", (i != 0 ? " " : ""), 206 rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); 207 } 208 printf("\n"); 209} 210 211void 212ieee80211_ht_announce(struct ieee80211com *ic) 213{ 214 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 215 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n); 216 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 217 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n); 218} 219 220const struct ieee80211_htrateset * 221ieee80211_get_suphtrates(struct ieee80211com *ic, 222 const struct ieee80211_channel *c) 223{ 224 return &ieee80211_rateset_11n; 225} 226 227/* 228 * Receive processing. 229 */ 230 231/* 232 * Decap the encapsulated A-MSDU frames and dispatch all but 233 * the last for delivery. The last frame is returned for 234 * delivery via the normal path. 235 */ 236struct mbuf * 237ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 238{ 239 struct ieee80211vap *vap = ni->ni_vap; 240 int framelen; 241 struct mbuf *n; 242 243 /* discard 802.3 header inserted by ieee80211_decap */ 244 m_adj(m, sizeof(struct ether_header)); 245 246 vap->iv_stats.is_amsdu_decap++; 247 248 for (;;) { 249 /* 250 * Decap the first frame, bust it apart from the 251 * remainder and deliver. We leave the last frame 252 * delivery to the caller (for consistency with other 253 * code paths, could also do it here). 254 */ 255 m = ieee80211_decap1(m, &framelen); 256 if (m == NULL) { 257 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 258 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 259 vap->iv_stats.is_amsdu_tooshort++; 260 return NULL; 261 } 262 if (m->m_pkthdr.len == framelen) 263 break; 264 n = m_split(m, framelen, M_NOWAIT); 265 if (n == NULL) { 266 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 267 ni->ni_macaddr, "a-msdu", 268 "%s", "unable to split encapsulated frames"); 269 vap->iv_stats.is_amsdu_split++; 270 m_freem(m); /* NB: must reclaim */ 271 return NULL; 272 } 273 vap->iv_deliver_data(vap, ni, m); 274 275 /* 276 * Remove frame contents; each intermediate frame 277 * is required to be aligned to a 4-byte boundary. 278 */ 279 m = n; 280 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 281 } 282 return m; /* last delivered by caller */ 283} 284 285/* 286 * Purge all frames in the A-MPDU re-order queue. 287 */ 288static void 289ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 290{ 291 struct mbuf *m; 292 int i; 293 294 for (i = 0; i < rap->rxa_wnd; i++) { 295 m = rap->rxa_m[i]; 296 if (m != NULL) { 297 rap->rxa_m[i] = NULL; 298 rap->rxa_qbytes -= m->m_pkthdr.len; 299 m_freem(m); 300 if (--rap->rxa_qframes == 0) 301 break; 302 } 303 } 304 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 305 ("lost %u data, %u frames on ampdu rx q", 306 rap->rxa_qbytes, rap->rxa_qframes)); 307} 308 309/* 310 * Start A-MPDU rx/re-order processing for the specified TID. 311 */ 312static void 313ampdu_rx_start(struct ieee80211_rx_ampdu *rap, int bufsiz, int start) 314{ 315 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) { 316 /* 317 * AMPDU previously setup and not terminated with a DELBA, 318 * flush the reorder q's in case anything remains. 319 */ 320 ampdu_rx_purge(rap); 321 } 322 memset(rap, 0, sizeof(*rap)); 323 rap->rxa_wnd = (bufsiz == 0) ? 324 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 325 rap->rxa_start = start; 326 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND; 327} 328 329/* 330 * Stop A-MPDU rx processing for the specified TID. 331 */ 332static void 333ampdu_rx_stop(struct ieee80211_rx_ampdu *rap) 334{ 335 ampdu_rx_purge(rap); 336 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND); 337} 338 339/* 340 * Dispatch a frame from the A-MPDU reorder queue. The 341 * frame is fed back into ieee80211_input marked with an 342 * M_AMPDU_MPDU flag so it doesn't come back to us (it also 343 * permits ieee80211_input to optimize re-processing). 344 */ 345static __inline void 346ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 347{ 348 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */ 349 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU_MPDU set */ 350 (void) ieee80211_input(ni, m, 0, 0, 0); 351} 352 353/* 354 * Dispatch as many frames as possible from the re-order queue. 355 * Frames will always be "at the front"; we process all frames 356 * up to the first empty slot in the window. On completion we 357 * cleanup state if there are still pending frames in the current 358 * BA window. We assume the frame at slot 0 is already handled 359 * by the caller; we always start at slot 1. 360 */ 361static void 362ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 363{ 364 struct ieee80211vap *vap = ni->ni_vap; 365 struct mbuf *m; 366 int i; 367 368 /* flush run of frames */ 369 for (i = 1; i < rap->rxa_wnd; i++) { 370 m = rap->rxa_m[i]; 371 if (m == NULL) 372 break; 373 rap->rxa_m[i] = NULL; 374 rap->rxa_qbytes -= m->m_pkthdr.len; 375 rap->rxa_qframes--; 376 377 ampdu_dispatch(ni, m); 378 } 379 /* 380 * If frames remain, copy the mbuf pointers down so 381 * they correspond to the offsets in the new window. 382 */ 383 if (rap->rxa_qframes != 0) { 384 int n = rap->rxa_qframes, j; 385 for (j = i+1; j < rap->rxa_wnd; j++) { 386 if (rap->rxa_m[j] != NULL) { 387 rap->rxa_m[j-i] = rap->rxa_m[j]; 388 rap->rxa_m[j] = NULL; 389 if (--n == 0) 390 break; 391 } 392 } 393 KASSERT(n == 0, ("lost %d frames", n)); 394 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 395 } 396 /* 397 * Adjust the start of the BA window to 398 * reflect the frames just dispatched. 399 */ 400 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 401 vap->iv_stats.is_ampdu_rx_oor += i; 402} 403 404#ifdef IEEE80211_AMPDU_AGE 405/* 406 * Dispatch all frames in the A-MPDU re-order queue. 407 */ 408static void 409ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 410{ 411 struct ieee80211vap *vap = ni->ni_vap; 412 struct mbuf *m; 413 int i; 414 415 for (i = 0; i < rap->rxa_wnd; i++) { 416 m = rap->rxa_m[i]; 417 if (m == NULL) 418 continue; 419 rap->rxa_m[i] = NULL; 420 rap->rxa_qbytes -= m->m_pkthdr.len; 421 rap->rxa_qframes--; 422 vap->iv_stats.is_ampdu_rx_oor++; 423 424 ampdu_dispatch(ni, m); 425 if (rap->rxa_qframes == 0) 426 break; 427 } 428} 429#endif /* IEEE80211_AMPDU_AGE */ 430 431/* 432 * Dispatch all frames in the A-MPDU re-order queue 433 * preceding the specified sequence number. This logic 434 * handles window moves due to a received MSDU or BAR. 435 */ 436static void 437ampdu_rx_flush_upto(struct ieee80211_node *ni, 438 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 439{ 440 struct ieee80211vap *vap = ni->ni_vap; 441 struct mbuf *m; 442 ieee80211_seq seqno; 443 int i; 444 445 /* 446 * Flush any complete MSDU's with a sequence number lower 447 * than winstart. Gaps may exist. Note that we may actually 448 * dispatch frames past winstart if a run continues; this is 449 * an optimization that avoids having to do a separate pass 450 * to dispatch frames after moving the BA window start. 451 */ 452 seqno = rap->rxa_start; 453 for (i = 0; i < rap->rxa_wnd; i++) { 454 m = rap->rxa_m[i]; 455 if (m != NULL) { 456 rap->rxa_m[i] = NULL; 457 rap->rxa_qbytes -= m->m_pkthdr.len; 458 rap->rxa_qframes--; 459 vap->iv_stats.is_ampdu_rx_oor++; 460 461 ampdu_dispatch(ni, m); 462 } else { 463 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 464 break; 465 } 466 seqno = IEEE80211_SEQ_INC(seqno); 467 } 468 /* 469 * If frames remain, copy the mbuf pointers down so 470 * they correspond to the offsets in the new window. 471 */ 472 if (rap->rxa_qframes != 0) { 473 int n = rap->rxa_qframes, j; 474 475 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */ 476 KASSERT(rap->rxa_m[0] == NULL, 477 ("%s: BA window slot 0 occupied", __func__)); 478 for (j = i+1; j < rap->rxa_wnd; j++) { 479 if (rap->rxa_m[j] != NULL) { 480 rap->rxa_m[j-i] = rap->rxa_m[j]; 481 rap->rxa_m[j] = NULL; 482 if (--n == 0) 483 break; 484 } 485 } 486 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 487 "BA win <%d:%d> winstart %d", 488 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 489 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 490 winstart)); 491 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 492 } 493 /* 494 * Move the start of the BA window; we use the 495 * sequence number of the last MSDU that was 496 * passed up the stack+1 or winstart if stopped on 497 * a gap in the reorder buffer. 498 */ 499 rap->rxa_start = seqno; 500} 501 502/* 503 * Process a received QoS data frame for an HT station. Handle 504 * A-MPDU reordering: if this frame is received out of order 505 * and falls within the BA window hold onto it. Otherwise if 506 * this frame completes a run, flush any pending frames. We 507 * return 1 if the frame is consumed. A 0 is returned if 508 * the frame should be processed normally by the caller. 509 */ 510int 511ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 512{ 513#define IEEE80211_FC0_QOSDATA \ 514 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 515#define PROCESS 0 /* caller should process frame */ 516#define CONSUMED 1 /* frame consumed, caller does nothing */ 517 struct ieee80211vap *vap = ni->ni_vap; 518 struct ieee80211_qosframe *wh; 519 struct ieee80211_rx_ampdu *rap; 520 ieee80211_seq rxseq; 521 uint8_t tid; 522 int off; 523 524 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU, 525 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags)); 526 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 527 528 /* NB: m_len known to be sufficient */ 529 wh = mtod(m, struct ieee80211_qosframe *); 530 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) { 531 /* 532 * Not QoS data, shouldn't get here but just 533 * return it to the caller for processing. 534 */ 535 return PROCESS; 536 } 537 538 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 539 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 540 else 541 tid = wh->i_qos[0]; 542 tid &= IEEE80211_QOS_TID; 543 rap = &ni->ni_rx_ampdu[tid]; 544 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 545 /* 546 * No ADDBA request yet, don't touch. 547 */ 548 return PROCESS; 549 } 550 rxseq = le16toh(*(uint16_t *)wh->i_seq); 551 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) { 552 /* 553 * Fragments are not allowed; toss. 554 */ 555 IEEE80211_DISCARD_MAC(vap, 556 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 557 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid, 558 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 559 vap->iv_stats.is_ampdu_rx_drop++; 560 IEEE80211_NODE_STAT(ni, rx_drop); 561 m_freem(m); 562 return CONSUMED; 563 } 564 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT; 565 rap->rxa_nframes++; 566again: 567 if (rxseq == rap->rxa_start) { 568 /* 569 * First frame in window. 570 */ 571 if (rap->rxa_qframes != 0) { 572 /* 573 * Dispatch as many packets as we can. 574 */ 575 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 576 ampdu_dispatch(ni, m); 577 ampdu_rx_dispatch(rap, ni); 578 return CONSUMED; 579 } else { 580 /* 581 * In order; advance window and notify 582 * caller to dispatch directly. 583 */ 584 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 585 return PROCESS; 586 } 587 } 588 /* 589 * Frame is out of order; store if in the BA window. 590 */ 591 /* calculate offset in BA window */ 592 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 593 if (off < rap->rxa_wnd) { 594 /* 595 * Common case (hopefully): in the BA window. 596 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 597 */ 598#ifdef IEEE80211_AMPDU_AGE 599 /* 600 * Check for frames sitting too long in the reorder queue. 601 * This should only ever happen if frames are not delivered 602 * without the sender otherwise notifying us (e.g. with a 603 * BAR to move the window). Typically this happens because 604 * of vendor bugs that cause the sequence number to jump. 605 * When this happens we get a gap in the reorder queue that 606 * leaves frame sitting on the queue until they get pushed 607 * out due to window moves. When the vendor does not send 608 * BAR this move only happens due to explicit packet sends 609 * 610 * NB: we only track the time of the oldest frame in the 611 * reorder q; this means that if we flush we might push 612 * frames that still "new"; if this happens then subsequent 613 * frames will result in BA window moves which cost something 614 * but is still better than a big throughput dip. 615 */ 616 if (rap->rxa_qframes != 0) { 617 /* XXX honor batimeout? */ 618 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 619 /* 620 * Too long since we received the first 621 * frame; flush the reorder buffer. 622 */ 623 if (rap->rxa_qframes != 0) { 624 vap->iv_stats.is_ampdu_rx_age += 625 rap->rxa_qframes; 626 ampdu_rx_flush(ni, rap); 627 } 628 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 629 return PROCESS; 630 } 631 } else { 632 /* 633 * First frame, start aging timer. 634 */ 635 rap->rxa_age = ticks; 636 } 637#endif /* IEEE80211_AMPDU_AGE */ 638 /* save packet */ 639 if (rap->rxa_m[off] == NULL) { 640 rap->rxa_m[off] = m; 641 rap->rxa_qframes++; 642 rap->rxa_qbytes += m->m_pkthdr.len; 643 vap->iv_stats.is_ampdu_rx_reorder++; 644 } else { 645 IEEE80211_DISCARD_MAC(vap, 646 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 647 ni->ni_macaddr, "a-mpdu duplicate", 648 "seqno %u tid %u BA win <%u:%u>", 649 rxseq, tid, rap->rxa_start, 650 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 651 vap->iv_stats.is_rx_dup++; 652 IEEE80211_NODE_STAT(ni, rx_dup); 653 m_freem(m); 654 } 655 return CONSUMED; 656 } 657 if (off < IEEE80211_SEQ_BA_RANGE) { 658 /* 659 * Outside the BA window, but within range; 660 * flush the reorder q and move the window. 661 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 662 */ 663 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 664 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 665 rap->rxa_start, 666 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 667 rap->rxa_qframes, rxseq, tid); 668 vap->iv_stats.is_ampdu_rx_move++; 669 670 /* 671 * The spec says to flush frames up to but not including: 672 * WinStart_B = rxseq - rap->rxa_wnd + 1 673 * Then insert the frame or notify the caller to process 674 * it immediately. We can safely do this by just starting 675 * over again because we know the frame will now be within 676 * the BA window. 677 */ 678 /* NB: rxa_wnd known to be >0 */ 679 ampdu_rx_flush_upto(ni, rap, 680 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 681 goto again; 682 } else { 683 /* 684 * Outside the BA window and out of range; toss. 685 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 686 */ 687 IEEE80211_DISCARD_MAC(vap, 688 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 689 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 690 rap->rxa_start, 691 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 692 rap->rxa_qframes, rxseq, tid, 693 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 694 vap->iv_stats.is_ampdu_rx_drop++; 695 IEEE80211_NODE_STAT(ni, rx_drop); 696 m_freem(m); 697 return CONSUMED; 698 } 699#undef CONSUMED 700#undef PROCESS 701#undef IEEE80211_FC0_QOSDATA 702} 703 704/* 705 * Process a BAR ctl frame. Dispatch all frames up to 706 * the sequence number of the frame. If this frame is 707 * out of range it's discarded. 708 */ 709void 710ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 711{ 712 struct ieee80211vap *vap = ni->ni_vap; 713 struct ieee80211_frame_bar *wh; 714 struct ieee80211_rx_ampdu *rap; 715 ieee80211_seq rxseq; 716 int tid, off; 717 718 if (!ieee80211_recv_bar_ena) { 719#if 0 720 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 721 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 722#endif 723 vap->iv_stats.is_ampdu_bar_bad++; 724 return; 725 } 726 wh = mtod(m0, struct ieee80211_frame_bar *); 727 /* XXX check basic BAR */ 728 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 729 rap = &ni->ni_rx_ampdu[tid]; 730 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 731 /* 732 * No ADDBA request yet, don't touch. 733 */ 734 IEEE80211_DISCARD_MAC(vap, 735 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 736 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 737 vap->iv_stats.is_ampdu_bar_bad++; 738 return; 739 } 740 vap->iv_stats.is_ampdu_bar_rx++; 741 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 742 if (rxseq == rap->rxa_start) 743 return; 744 /* calculate offset in BA window */ 745 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 746 if (off < IEEE80211_SEQ_BA_RANGE) { 747 /* 748 * Flush the reorder q up to rxseq and move the window. 749 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 750 */ 751 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 752 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 753 rap->rxa_start, 754 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 755 rap->rxa_qframes, rxseq, tid); 756 vap->iv_stats.is_ampdu_bar_move++; 757 758 ampdu_rx_flush_upto(ni, rap, rxseq); 759 if (off >= rap->rxa_wnd) { 760 /* 761 * BAR specifies a window start to the right of BA 762 * window; we must move it explicitly since 763 * ampdu_rx_flush_upto will not. 764 */ 765 rap->rxa_start = rxseq; 766 } 767 } else { 768 /* 769 * Out of range; toss. 770 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 771 */ 772 IEEE80211_DISCARD_MAC(vap, 773 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 774 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 775 rap->rxa_start, 776 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 777 rap->rxa_qframes, rxseq, tid, 778 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 779 vap->iv_stats.is_ampdu_bar_oow++; 780 IEEE80211_NODE_STAT(ni, rx_drop); 781 } 782} 783 784/* 785 * Setup HT-specific state in a node. Called only 786 * when HT use is negotiated so we don't do extra 787 * work for temporary and/or legacy sta's. 788 */ 789void 790ieee80211_ht_node_init(struct ieee80211_node *ni) 791{ 792 struct ieee80211_tx_ampdu *tap; 793 int ac; 794 795 if (ni->ni_flags & IEEE80211_NODE_HT) { 796 /* 797 * Clean AMPDU state on re-associate. This handles the case 798 * where a station leaves w/o notifying us and then returns 799 * before node is reaped for inactivity. 800 */ 801 ieee80211_ht_node_cleanup(ni); 802 } 803 for (ac = 0; ac < WME_NUM_AC; ac++) { 804 tap = &ni->ni_tx_ampdu[ac]; 805 tap->txa_ac = ac; 806 /* NB: further initialization deferred */ 807 } 808 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 809} 810 811/* 812 * Cleanup HT-specific state in a node. Called only 813 * when HT use has been marked. 814 */ 815void 816ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 817{ 818 struct ieee80211com *ic = ni->ni_ic; 819 int i; 820 821 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 822 823 /* XXX optimize this */ 824 for (i = 0; i < WME_NUM_AC; i++) { 825 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 826 if (tap->txa_flags & IEEE80211_AGGR_SETUP) { 827 /* 828 * Stop BA stream if setup so driver has a chance 829 * to reclaim any resources it might have allocated. 830 */ 831 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]); 832 tap->txa_lastsample = 0; 833 tap->txa_avgpps = 0; 834 /* NB: clearing NAK means we may re-send ADDBA */ 835 tap->txa_flags &= 836 ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 837 } 838 } 839 for (i = 0; i < WME_NUM_TID; i++) 840 ampdu_rx_stop(&ni->ni_rx_ampdu[i]); 841 842 ni->ni_htcap = 0; 843 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL; 844} 845 846/* 847 * Age out HT resources for a station. 848 */ 849void 850ieee80211_ht_node_age(struct ieee80211_node *ni) 851{ 852#ifdef IEEE80211_AMPDU_AGE 853 struct ieee80211vap *vap = ni->ni_vap; 854 uint8_t tid; 855#endif 856 857 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 858 859#ifdef IEEE80211_AMPDU_AGE 860 for (tid = 0; tid < WME_NUM_TID; tid++) { 861 struct ieee80211_rx_ampdu *rap; 862 863 rap = &ni->ni_rx_ampdu[tid]; 864 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 865 continue; 866 if (rap->rxa_qframes == 0) 867 continue; 868 /* 869 * Check for frames sitting too long in the reorder queue. 870 * See above for more details on what's happening here. 871 */ 872 /* XXX honor batimeout? */ 873 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 874 /* 875 * Too long since we received the first 876 * frame; flush the reorder buffer. 877 */ 878 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 879 ampdu_rx_flush(ni, rap); 880 } 881 } 882#endif /* IEEE80211_AMPDU_AGE */ 883} 884 885static struct ieee80211_channel * 886findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 887{ 888 return ieee80211_find_channel(ic, c->ic_freq, 889 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 890} 891 892/* 893 * Adjust a channel to be HT/non-HT according to the vap's configuration. 894 */ 895struct ieee80211_channel * 896ieee80211_ht_adjust_channel(struct ieee80211com *ic, 897 struct ieee80211_channel *chan, int flags) 898{ 899 struct ieee80211_channel *c; 900 901 if (flags & IEEE80211_FEXT_HT) { 902 /* promote to HT if possible */ 903 if (flags & IEEE80211_FEXT_USEHT40) { 904 if (!IEEE80211_IS_CHAN_HT40(chan)) { 905 /* NB: arbitrarily pick ht40+ over ht40- */ 906 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 907 if (c == NULL) 908 c = findhtchan(ic, chan, 909 IEEE80211_CHAN_HT40D); 910 if (c == NULL) 911 c = findhtchan(ic, chan, 912 IEEE80211_CHAN_HT20); 913 if (c != NULL) 914 chan = c; 915 } 916 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 917 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 918 if (c != NULL) 919 chan = c; 920 } 921 } else if (IEEE80211_IS_CHAN_HT(chan)) { 922 /* demote to legacy, HT use is disabled */ 923 c = ieee80211_find_channel(ic, chan->ic_freq, 924 chan->ic_flags &~ IEEE80211_CHAN_HT); 925 if (c != NULL) 926 chan = c; 927 } 928 return chan; 929} 930 931/* 932 * Setup HT-specific state for a legacy WDS peer. 933 */ 934void 935ieee80211_ht_wds_init(struct ieee80211_node *ni) 936{ 937 struct ieee80211vap *vap = ni->ni_vap; 938 struct ieee80211_tx_ampdu *tap; 939 int ac; 940 941 KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested")); 942 943 /* XXX check scan cache in case peer has an ap and we have info */ 944 /* 945 * If setup with a legacy channel; locate an HT channel. 946 * Otherwise if the inherited channel (from a companion 947 * AP) is suitable use it so we use the same location 948 * for the extension channel). 949 */ 950 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 951 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 952 953 ni->ni_htcap = 0; 954 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) 955 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 956 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 957 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 958 ni->ni_chw = 40; 959 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 960 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 961 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 962 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 963 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) 964 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 965 } else { 966 ni->ni_chw = 20; 967 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 968 } 969 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 970 if (vap->iv_flags_ext & IEEE80211_FEXT_RIFS) 971 ni->ni_flags |= IEEE80211_NODE_RIFS; 972 /* XXX does it make sense to enable SMPS? */ 973 974 ni->ni_htopmode = 0; /* XXX need protection state */ 975 ni->ni_htstbc = 0; /* XXX need info */ 976 977 for (ac = 0; ac < WME_NUM_AC; ac++) { 978 tap = &ni->ni_tx_ampdu[ac]; 979 tap->txa_ac = ac; 980 } 981 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */ 982 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 983} 984 985/* 986 * Notify hostap vaps of a change in the HTINFO ie. 987 */ 988static void 989htinfo_notify(struct ieee80211com *ic) 990{ 991 struct ieee80211vap *vap; 992 int first = 1; 993 994 IEEE80211_LOCK_ASSERT(ic); 995 996 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 997 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 998 continue; 999 if (vap->iv_state != IEEE80211_S_RUN || 1000 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan)) 1001 continue; 1002 if (first) { 1003 IEEE80211_NOTE(vap, 1004 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 1005 vap->iv_bss, 1006 "HT bss occupancy change: %d sta, %d ht, " 1007 "%d ht40%s, HT protmode now 0x%x" 1008 , ic->ic_sta_assoc 1009 , ic->ic_ht_sta_assoc 1010 , ic->ic_ht40_sta_assoc 1011 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ? 1012 ", non-HT sta present" : "" 1013 , ic->ic_curhtprotmode); 1014 first = 0; 1015 } 1016 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 1017 } 1018} 1019 1020/* 1021 * Calculate HT protection mode from current 1022 * state and handle updates. 1023 */ 1024static void 1025htinfo_update(struct ieee80211com *ic) 1026{ 1027 uint8_t protmode; 1028 1029 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1030 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1031 | IEEE80211_HTINFO_NONHT_PRESENT; 1032 } else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) { 1033 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1034 | IEEE80211_HTINFO_NONHT_PRESENT; 1035 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1036 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1037 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1038 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1039 } else { 1040 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1041 } 1042 if (protmode != ic->ic_curhtprotmode) { 1043 ic->ic_curhtprotmode = protmode; 1044 htinfo_notify(ic); 1045 } 1046} 1047 1048/* 1049 * Handle an HT station joining a BSS. 1050 */ 1051void 1052ieee80211_ht_node_join(struct ieee80211_node *ni) 1053{ 1054 struct ieee80211com *ic = ni->ni_ic; 1055 1056 IEEE80211_LOCK_ASSERT(ic); 1057 1058 if (ni->ni_flags & IEEE80211_NODE_HT) { 1059 ic->ic_ht_sta_assoc++; 1060 if (ni->ni_chw == 40) 1061 ic->ic_ht40_sta_assoc++; 1062 } 1063 htinfo_update(ic); 1064} 1065 1066/* 1067 * Handle an HT station leaving a BSS. 1068 */ 1069void 1070ieee80211_ht_node_leave(struct ieee80211_node *ni) 1071{ 1072 struct ieee80211com *ic = ni->ni_ic; 1073 1074 IEEE80211_LOCK_ASSERT(ic); 1075 1076 if (ni->ni_flags & IEEE80211_NODE_HT) { 1077 ic->ic_ht_sta_assoc--; 1078 if (ni->ni_chw == 40) 1079 ic->ic_ht40_sta_assoc--; 1080 } 1081 htinfo_update(ic); 1082} 1083 1084/* 1085 * Public version of htinfo_update; used for processing 1086 * beacon frames from overlapping bss. 1087 * 1088 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1089 * (on receipt of a beacon that advertises MIXED) or 1090 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1091 * from an overlapping legacy bss). We treat MIXED with 1092 * a higher precedence than PROTOPT (i.e. we will not change 1093 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1094 * corresponds to how we handle things in htinfo_update. 1095 */ 1096void 1097ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1098{ 1099#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1100 IEEE80211_LOCK(ic); 1101 1102 /* track non-HT station presence */ 1103 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1104 ("protmode 0x%x", protmode)); 1105 ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR; 1106 ic->ic_lastnonht = ticks; 1107 1108 if (protmode != ic->ic_curhtprotmode && 1109 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED || 1110 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) { 1111 /* push beacon update */ 1112 ic->ic_curhtprotmode = protmode; 1113 htinfo_notify(ic); 1114 } 1115 IEEE80211_UNLOCK(ic); 1116#undef OPMODE 1117} 1118 1119/* 1120 * Time out presence of an overlapping bss with non-HT 1121 * stations. When operating in hostap mode we listen for 1122 * beacons from other stations and if we identify a non-HT 1123 * station is present we update the opmode field of the 1124 * HTINFO ie. To identify when all non-HT stations are 1125 * gone we time out this condition. 1126 */ 1127void 1128ieee80211_ht_timeout(struct ieee80211com *ic) 1129{ 1130 IEEE80211_LOCK_ASSERT(ic); 1131 1132 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) && 1133 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1134#if 0 1135 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1136 "%s", "time out non-HT STA present on channel"); 1137#endif 1138 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 1139 htinfo_update(ic); 1140 } 1141} 1142 1143/* unalligned little endian access */ 1144#define LE_READ_2(p) \ 1145 ((uint16_t) \ 1146 ((((const uint8_t *)(p))[0] ) | \ 1147 (((const uint8_t *)(p))[1] << 8))) 1148 1149/* 1150 * Process an 802.11n HT capabilities ie. 1151 */ 1152void 1153ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1154{ 1155 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1156 /* 1157 * Station used Vendor OUI ie to associate; 1158 * mark the node so when we respond we'll use 1159 * the Vendor OUI's and not the standard ie's. 1160 */ 1161 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1162 ie += 4; 1163 } else 1164 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1165 1166 ni->ni_htcap = LE_READ_2(ie + 1167 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1168 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1169} 1170 1171static void 1172htinfo_parse(struct ieee80211_node *ni, 1173 const struct ieee80211_ie_htinfo *htinfo) 1174{ 1175 uint16_t w; 1176 1177 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1178 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1179 w = LE_READ_2(&htinfo->hi_byte2); 1180 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1181 w = LE_READ_2(&htinfo->hi_byte45); 1182 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1183} 1184 1185/* 1186 * Parse an 802.11n HT info ie and save useful information 1187 * to the node state. Note this does not effect any state 1188 * changes such as for channel width change. 1189 */ 1190void 1191ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1192{ 1193 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1194 ie += 4; 1195 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie); 1196} 1197 1198/* 1199 * Handle 11n channel switch. Use the received HT ie's to 1200 * identify the right channel to use. If we cannot locate it 1201 * in the channel table then fallback to legacy operation. 1202 * Note that we use this information to identify the node's 1203 * channel only; the caller is responsible for insuring any 1204 * required channel change is done (e.g. in sta mode when 1205 * parsing the contents of a beacon frame). 1206 */ 1207static void 1208htinfo_update_chw(struct ieee80211_node *ni, int htflags) 1209{ 1210 struct ieee80211com *ic = ni->ni_ic; 1211 struct ieee80211_channel *c; 1212 int chanflags; 1213 1214 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1215 if (chanflags != ni->ni_chan->ic_flags) { 1216 /* XXX not right for ht40- */ 1217 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1218 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1219 /* 1220 * No HT40 channel entry in our table; fall back 1221 * to HT20 operation. This should not happen. 1222 */ 1223 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1224#if 0 1225 IEEE80211_NOTE(ni->ni_vap, 1226 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1227 "no HT40 channel (freq %u), falling back to HT20", 1228 ni->ni_chan->ic_freq); 1229#endif 1230 /* XXX stat */ 1231 } 1232 if (c != NULL && c != ni->ni_chan) { 1233 IEEE80211_NOTE(ni->ni_vap, 1234 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1235 "switch station to HT%d channel %u/0x%x", 1236 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1237 c->ic_freq, c->ic_flags); 1238 ni->ni_chan = c; 1239 } 1240 /* NB: caller responsible for forcing any channel change */ 1241 } 1242 /* update node's tx channel width */ 1243 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1244} 1245 1246/* 1247 * Update 11n MIMO PS state according to received htcap. 1248 */ 1249static __inline int 1250htcap_update_mimo_ps(struct ieee80211_node *ni) 1251{ 1252 uint16_t oflags = ni->ni_flags; 1253 1254 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) { 1255 case IEEE80211_HTCAP_SMPS_DYNAMIC: 1256 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1257 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1258 break; 1259 case IEEE80211_HTCAP_SMPS_ENA: 1260 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1261 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1262 break; 1263 case IEEE80211_HTCAP_SMPS_OFF: 1264 default: /* disable on rx of reserved value */ 1265 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1266 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1267 break; 1268 } 1269 return (oflags ^ ni->ni_flags); 1270} 1271 1272/* 1273 * Parse and update HT-related state extracted from 1274 * the HT cap and info ie's. 1275 */ 1276void 1277ieee80211_ht_updateparams(struct ieee80211_node *ni, 1278 const uint8_t *htcapie, const uint8_t *htinfoie) 1279{ 1280 struct ieee80211vap *vap = ni->ni_vap; 1281 const struct ieee80211_ie_htinfo *htinfo; 1282 int htflags; 1283 1284 ieee80211_parse_htcap(ni, htcapie); 1285 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1286 htcap_update_mimo_ps(ni); 1287 1288 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR) 1289 htinfoie += 4; 1290 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie; 1291 htinfo_parse(ni, htinfo); 1292 1293 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1294 IEEE80211_CHAN_HT20 : 0; 1295 /* NB: honor operating mode constraint */ 1296 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1297 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1298 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1299 htflags = IEEE80211_CHAN_HT40U; 1300 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1301 htflags = IEEE80211_CHAN_HT40D; 1302 } 1303 htinfo_update_chw(ni, htflags); 1304 1305 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) && 1306 (vap->iv_flags_ext & IEEE80211_FEXT_RIFS)) 1307 ni->ni_flags |= IEEE80211_NODE_RIFS; 1308 else 1309 ni->ni_flags &= ~IEEE80211_NODE_RIFS; 1310} 1311 1312/* 1313 * Parse and update HT-related state extracted from the HT cap ie 1314 * for a station joining an HT BSS. 1315 */ 1316void 1317ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie) 1318{ 1319 struct ieee80211vap *vap = ni->ni_vap; 1320 int htflags; 1321 1322 ieee80211_parse_htcap(ni, htcapie); 1323 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1324 htcap_update_mimo_ps(ni); 1325 1326 /* NB: honor operating mode constraint */ 1327 /* XXX 40 MHZ intolerant */ 1328 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1329 IEEE80211_CHAN_HT20 : 0; 1330 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1331 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1332 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan)) 1333 htflags = IEEE80211_CHAN_HT40U; 1334 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan)) 1335 htflags = IEEE80211_CHAN_HT40D; 1336 } 1337 htinfo_update_chw(ni, htflags); 1338} 1339 1340/* 1341 * Install received HT rate set by parsing the HT cap ie. 1342 */ 1343int 1344ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1345{ 1346 struct ieee80211vap *vap = ni->ni_vap; 1347 const struct ieee80211_ie_htcap *htcap; 1348 struct ieee80211_htrateset *rs; 1349 int i; 1350 1351 rs = &ni->ni_htrates; 1352 memset(rs, 0, sizeof(*rs)); 1353 if (ie != NULL) { 1354 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1355 ie += 4; 1356 htcap = (const struct ieee80211_ie_htcap *) ie; 1357 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1358 if (isclr(htcap->hc_mcsset, i)) 1359 continue; 1360 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1361 IEEE80211_NOTE(vap, 1362 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1363 "WARNING, HT rate set too large; only " 1364 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1365 vap->iv_stats.is_rx_rstoobig++; 1366 break; 1367 } 1368 rs->rs_rates[rs->rs_nrates++] = i; 1369 } 1370 } 1371 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1372} 1373 1374/* 1375 * Mark rates in a node's HT rate set as basic according 1376 * to the information in the supplied HT info ie. 1377 */ 1378void 1379ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1380{ 1381 const struct ieee80211_ie_htinfo *htinfo; 1382 struct ieee80211_htrateset *rs; 1383 int i, j; 1384 1385 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1386 ie += 4; 1387 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1388 rs = &ni->ni_htrates; 1389 if (rs->rs_nrates == 0) { 1390 IEEE80211_NOTE(ni->ni_vap, 1391 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1392 "%s", "WARNING, empty HT rate set"); 1393 return; 1394 } 1395 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1396 if (isclr(htinfo->hi_basicmcsset, i)) 1397 continue; 1398 for (j = 0; j < rs->rs_nrates; j++) 1399 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1400 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1401 } 1402} 1403 1404static void 1405addba_timeout(void *arg) 1406{ 1407 struct ieee80211_tx_ampdu *tap = arg; 1408 1409 /* XXX ? */ 1410 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1411 tap->txa_attempts++; 1412} 1413 1414static void 1415addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1416{ 1417 /* XXX use CALLOUT_PENDING instead? */ 1418 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1419 addba_timeout, tap); 1420 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1421 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1422} 1423 1424static void 1425addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1426{ 1427 /* XXX use CALLOUT_PENDING instead? */ 1428 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1429 callout_stop(&tap->txa_timer); 1430 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1431 } 1432} 1433 1434/* 1435 * Default method for requesting A-MPDU tx aggregation. 1436 * We setup the specified state block and start a timer 1437 * to wait for an ADDBA response frame. 1438 */ 1439static int 1440ieee80211_addba_request(struct ieee80211_node *ni, 1441 struct ieee80211_tx_ampdu *tap, 1442 int dialogtoken, int baparamset, int batimeout) 1443{ 1444 int bufsiz; 1445 1446 /* XXX locking */ 1447 tap->txa_token = dialogtoken; 1448 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1449 tap->txa_start = 0; 1450 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1451 tap->txa_wnd = (bufsiz == 0) ? 1452 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1453 addba_start_timeout(tap); 1454 return 1; 1455} 1456 1457/* 1458 * Default method for processing an A-MPDU tx aggregation 1459 * response. We shutdown any pending timer and update the 1460 * state block according to the reply. 1461 */ 1462static int 1463ieee80211_addba_response(struct ieee80211_node *ni, 1464 struct ieee80211_tx_ampdu *tap, 1465 int status, int baparamset, int batimeout) 1466{ 1467 int bufsiz; 1468 1469 /* XXX locking */ 1470 addba_stop_timeout(tap); 1471 if (status == IEEE80211_STATUS_SUCCESS) { 1472 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1473 /* XXX override our request? */ 1474 tap->txa_wnd = (bufsiz == 0) ? 1475 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1476 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1477 } else { 1478 /* mark tid so we don't try again */ 1479 tap->txa_flags |= IEEE80211_AGGR_NAK; 1480 } 1481 return 1; 1482} 1483 1484/* 1485 * Default method for stopping A-MPDU tx aggregation. 1486 * Any timer is cleared and we drain any pending frames. 1487 */ 1488static void 1489ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1490{ 1491 /* XXX locking */ 1492 addba_stop_timeout(tap); 1493 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1494 /* XXX clear aggregation queue */ 1495 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1496 } 1497 tap->txa_attempts = 0; 1498} 1499 1500/* 1501 * Process a received action frame using the default aggregation 1502 * policy. We intercept ADDBA-related frames and use them to 1503 * update our aggregation state. All other frames are passed up 1504 * for processing by ieee80211_recv_action. 1505 */ 1506static void 1507ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1508 const uint8_t *frm, const uint8_t *efrm) 1509{ 1510 struct ieee80211com *ic = ni->ni_ic; 1511 struct ieee80211vap *vap = ni->ni_vap; 1512 const struct ieee80211_action *ia; 1513 struct ieee80211_rx_ampdu *rap; 1514 struct ieee80211_tx_ampdu *tap; 1515 uint8_t dialogtoken, policy; 1516 uint16_t baparamset, batimeout, baseqctl, code; 1517 uint16_t args[4]; 1518 int tid, ac, bufsiz; 1519 1520 ia = (const struct ieee80211_action *) frm; 1521 switch (ia->ia_category) { 1522 case IEEE80211_ACTION_CAT_BA: 1523 switch (ia->ia_action) { 1524 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1525 dialogtoken = frm[2]; 1526 baparamset = LE_READ_2(frm+3); 1527 batimeout = LE_READ_2(frm+5); 1528 baseqctl = LE_READ_2(frm+7); 1529 1530 tid = MS(baparamset, IEEE80211_BAPS_TID); 1531 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1532 1533 IEEE80211_NOTE(vap, 1534 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1535 "recv ADDBA request: dialogtoken %u " 1536 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1537 "baseqctl %d:%d", 1538 dialogtoken, baparamset, tid, bufsiz, batimeout, 1539 MS(baseqctl, IEEE80211_BASEQ_START), 1540 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1541 1542 rap = &ni->ni_rx_ampdu[tid]; 1543 1544 /* Send ADDBA response */ 1545 args[0] = dialogtoken; 1546 /* 1547 * NB: We ack only if the sta associated with HT and 1548 * the ap is configured to do AMPDU rx (the latter 1549 * violates the 11n spec and is mostly for testing). 1550 */ 1551 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1552 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) { 1553 ampdu_rx_start(rap, bufsiz, 1554 MS(baseqctl, IEEE80211_BASEQ_START)); 1555 1556 args[1] = IEEE80211_STATUS_SUCCESS; 1557 } else { 1558 IEEE80211_NOTE(vap, 1559 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1560 ni, "reject ADDBA request: %s", 1561 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1562 "administratively disabled" : 1563 "not negotiated for station"); 1564 vap->iv_stats.is_addba_reject++; 1565 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1566 } 1567 /* XXX honor rap flags? */ 1568 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1569 | SM(tid, IEEE80211_BAPS_TID) 1570 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1571 ; 1572 args[3] = 0; 1573 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1574 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1575 return; 1576 1577 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1578 dialogtoken = frm[2]; 1579 code = LE_READ_2(frm+3); 1580 baparamset = LE_READ_2(frm+5); 1581 tid = MS(baparamset, IEEE80211_BAPS_TID); 1582 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1583 policy = MS(baparamset, IEEE80211_BAPS_POLICY); 1584 batimeout = LE_READ_2(frm+7); 1585 1586 ac = TID_TO_WME_AC(tid); 1587 tap = &ni->ni_tx_ampdu[ac]; 1588 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1589 IEEE80211_DISCARD_MAC(vap, 1590 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1591 ni->ni_macaddr, "ADDBA response", 1592 "no pending ADDBA, tid %d dialogtoken %u " 1593 "code %d", tid, dialogtoken, code); 1594 vap->iv_stats.is_addba_norequest++; 1595 return; 1596 } 1597 if (dialogtoken != tap->txa_token) { 1598 IEEE80211_DISCARD_MAC(vap, 1599 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1600 ni->ni_macaddr, "ADDBA response", 1601 "dialogtoken mismatch: waiting for %d, " 1602 "received %d, tid %d code %d", 1603 tap->txa_token, dialogtoken, tid, code); 1604 vap->iv_stats.is_addba_badtoken++; 1605 return; 1606 } 1607 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */ 1608 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) { 1609 IEEE80211_DISCARD_MAC(vap, 1610 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1611 ni->ni_macaddr, "ADDBA response", 1612 "policy mismatch: expecting %s, " 1613 "received %s, tid %d code %d", 1614 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE, 1615 policy, tid, code); 1616 vap->iv_stats.is_addba_badpolicy++; 1617 return; 1618 } 1619#if 0 1620 /* XXX we take MIN in ieee80211_addba_response */ 1621 if (bufsiz > IEEE80211_AGGR_BAWMAX) { 1622 IEEE80211_DISCARD_MAC(vap, 1623 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1624 ni->ni_macaddr, "ADDBA response", 1625 "BA window too large: max %d, " 1626 "received %d, tid %d code %d", 1627 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code); 1628 vap->iv_stats.is_addba_badbawinsize++; 1629 return; 1630 } 1631#endif 1632 1633 IEEE80211_NOTE(vap, 1634 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1635 "recv ADDBA response: dialogtoken %u code %d " 1636 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1637 dialogtoken, code, baparamset, tid, bufsiz, 1638 batimeout); 1639 ic->ic_addba_response(ni, tap, 1640 code, baparamset, batimeout); 1641 return; 1642 1643 case IEEE80211_ACTION_BA_DELBA: 1644 baparamset = LE_READ_2(frm+2); 1645 code = LE_READ_2(frm+4); 1646 1647 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1648 1649 IEEE80211_NOTE(vap, 1650 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1651 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1652 "code %d", baparamset, tid, 1653 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1654 1655 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1656 ac = TID_TO_WME_AC(tid); 1657 tap = &ni->ni_tx_ampdu[ac]; 1658 ic->ic_addba_stop(ni, tap); 1659 } else { 1660 rap = &ni->ni_rx_ampdu[tid]; 1661 ampdu_rx_stop(rap); 1662 } 1663 return; 1664 } 1665 break; 1666 } 1667 ieee80211_recv_action(ni, frm, efrm); 1668} 1669 1670/* 1671 * Process a received 802.11n action frame. 1672 * Aggregation-related frames are assumed to be handled 1673 * already; we handle any other frames we can, otherwise 1674 * complain about being unsupported (with debugging). 1675 */ 1676void 1677ieee80211_recv_action(struct ieee80211_node *ni, 1678 const uint8_t *frm, const uint8_t *efrm) 1679{ 1680 struct ieee80211vap *vap = ni->ni_vap; 1681 const struct ieee80211_action *ia; 1682 int chw; 1683 1684 ia = (const struct ieee80211_action *) frm; 1685 switch (ia->ia_category) { 1686 case IEEE80211_ACTION_CAT_BA: 1687 IEEE80211_NOTE(vap, 1688 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1689 "%s: BA action %d not implemented", __func__, 1690 ia->ia_action); 1691 vap->iv_stats.is_rx_mgtdiscard++; 1692 break; 1693 case IEEE80211_ACTION_CAT_HT: 1694 switch (ia->ia_action) { 1695 case IEEE80211_ACTION_HT_TXCHWIDTH: 1696 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1697 IEEE80211_NOTE(vap, 1698 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1699 "%s: HT txchwidth, width %d%s", 1700 __func__, chw, ni->ni_chw != chw ? "*" : ""); 1701 if (chw != ni->ni_chw) { 1702 ni->ni_chw = chw; 1703 /* XXX notify on change */ 1704 } 1705 break; 1706 case IEEE80211_ACTION_HT_MIMOPWRSAVE: { 1707 const struct ieee80211_action_ht_mimopowersave *mps = 1708 (const struct ieee80211_action_ht_mimopowersave *) ia; 1709 /* XXX check iv_htcaps */ 1710 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA) 1711 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1712 else 1713 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1714 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE) 1715 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1716 else 1717 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1718 /* XXX notify on change */ 1719 IEEE80211_NOTE(vap, 1720 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1721 "%s: HT MIMO PS (%s%s)", __func__, 1722 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? 1723 "on" : "off", 1724 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? 1725 "+rts" : "" 1726 ); 1727 break; 1728 } 1729 default: 1730 IEEE80211_NOTE(vap, 1731 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1732 "%s: HT action %d not implemented", __func__, 1733 ia->ia_action); 1734 vap->iv_stats.is_rx_mgtdiscard++; 1735 break; 1736 } 1737 break; 1738 default: 1739 IEEE80211_NOTE(vap, 1740 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1741 "%s: category %d not implemented", __func__, 1742 ia->ia_category); 1743 vap->iv_stats.is_rx_mgtdiscard++; 1744 break; 1745 } 1746} 1747 1748/* 1749 * Transmit processing. 1750 */ 1751 1752/* 1753 * Check if A-MPDU should be requested/enabled for a stream. 1754 * We require a traffic rate above a per-AC threshold and we 1755 * also handle backoff from previous failed attempts. 1756 * 1757 * Drivers may override this method to bring in information 1758 * such as link state conditions in making the decision. 1759 */ 1760static int 1761ieee80211_ampdu_enable(struct ieee80211_node *ni, 1762 struct ieee80211_tx_ampdu *tap) 1763{ 1764 struct ieee80211vap *vap = ni->ni_vap; 1765 1766 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1767 return 0; 1768 /* XXX check rssi? */ 1769 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1770 ticks < tap->txa_nextrequest) { 1771 /* 1772 * Don't retry too often; txa_nextrequest is set 1773 * to the minimum interval we'll retry after 1774 * ieee80211_addba_maxtries failed attempts are made. 1775 */ 1776 return 0; 1777 } 1778 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1779 "enable AMPDU on %s, avgpps %d pkts %d", 1780 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts); 1781 return 1; 1782} 1783 1784/* 1785 * Request A-MPDU tx aggregation. Setup local state and 1786 * issue an ADDBA request. BA use will only happen after 1787 * the other end replies with ADDBA response. 1788 */ 1789int 1790ieee80211_ampdu_request(struct ieee80211_node *ni, 1791 struct ieee80211_tx_ampdu *tap) 1792{ 1793 struct ieee80211com *ic = ni->ni_ic; 1794 uint16_t args[4]; 1795 int tid, dialogtoken; 1796 static int tokens = 0; /* XXX */ 1797 1798 /* XXX locking */ 1799 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1800 /* do deferred setup of state */ 1801 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1802 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1803 } 1804 /* XXX hack for not doing proper locking */ 1805 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1806 1807 dialogtoken = (tokens+1) % 63; /* XXX */ 1808 tid = WME_AC_TO_TID(tap->txa_ac); 1809 tap->txa_start = ni->ni_txseqs[tid]; 1810 1811 tid = WME_AC_TO_TID(tap->txa_ac); 1812 args[0] = dialogtoken; 1813 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1814 | SM(tid, IEEE80211_BAPS_TID) 1815 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1816 ; 1817 args[2] = 0; /* batimeout */ 1818 /* NB: do first so there's no race against reply */ 1819 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1820 /* unable to setup state, don't make request */ 1821 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1822 ni, "%s: could not setup BA stream for AC %d", 1823 __func__, tap->txa_ac); 1824 /* defer next try so we don't slam the driver with requests */ 1825 tap->txa_attempts = ieee80211_addba_maxtries; 1826 /* NB: check in case driver wants to override */ 1827 if (tap->txa_nextrequest <= ticks) 1828 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 1829 return 0; 1830 } 1831 tokens = dialogtoken; /* allocate token */ 1832 /* NB: after calling ic_addba_request so driver can set txa_start */ 1833 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START) 1834 | SM(0, IEEE80211_BASEQ_FRAG) 1835 ; 1836 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1837 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1838} 1839 1840/* 1841 * Terminate an AMPDU tx stream. State is reclaimed 1842 * and the peer notified with a DelBA Action frame. 1843 */ 1844void 1845ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap, 1846 int reason) 1847{ 1848 struct ieee80211com *ic = ni->ni_ic; 1849 struct ieee80211vap *vap = ni->ni_vap; 1850 uint16_t args[4]; 1851 1852 /* XXX locking */ 1853 if (IEEE80211_AMPDU_RUNNING(tap)) { 1854 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1855 ni, "%s: stop BA stream for AC %d (reason %d)", 1856 __func__, tap->txa_ac, reason); 1857 vap->iv_stats.is_ampdu_stop++; 1858 1859 ic->ic_addba_stop(ni, tap); 1860 args[0] = WME_AC_TO_TID(tap->txa_ac); 1861 args[1] = IEEE80211_DELBAPS_INIT; 1862 args[2] = reason; /* XXX reason code */ 1863 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1864 IEEE80211_ACTION_BA_DELBA, args); 1865 } else { 1866 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1867 ni, "%s: BA stream for AC %d not running (reason %d)", 1868 __func__, tap->txa_ac, reason); 1869 vap->iv_stats.is_ampdu_stop_failed++; 1870 } 1871} 1872 1873/* 1874 * Transmit a BAR frame to the specified node. The 1875 * BAR contents are drawn from the supplied aggregation 1876 * state associated with the node. 1877 */ 1878int 1879ieee80211_send_bar(struct ieee80211_node *ni, 1880 const struct ieee80211_tx_ampdu *tap) 1881{ 1882#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1883#define ADDSHORT(frm, v) do { \ 1884 frm[0] = (v) & 0xff; \ 1885 frm[1] = (v) >> 8; \ 1886 frm += 2; \ 1887} while (0) 1888 struct ieee80211vap *vap = ni->ni_vap; 1889 struct ieee80211com *ic = ni->ni_ic; 1890 struct ieee80211_frame_min *wh; 1891 struct mbuf *m; 1892 uint8_t *frm; 1893 uint16_t barctl, barseqctl; 1894 int tid, ret; 1895 1896 ieee80211_ref_node(ni); 1897 1898 m = ieee80211_getmgtframe(&frm, 1899 ic->ic_headroom + sizeof(struct ieee80211_frame_min), 1900 sizeof(struct ieee80211_ba_request) 1901 ); 1902 if (m == NULL) 1903 senderr(ENOMEM, is_tx_nobuf); 1904 1905 wh = mtod(m, struct ieee80211_frame_min *); 1906 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | 1907 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 1908 wh->i_fc[1] = 0; 1909 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1910 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1911 1912 tid = WME_AC_TO_TID(tap->txa_ac); 1913 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 1914 IEEE80211_BAPS_POLICY_IMMEDIATE : 1915 IEEE80211_BAPS_POLICY_DELAYED) 1916 | SM(tid, IEEE80211_BAPS_TID) 1917 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ) 1918 ; 1919 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START) 1920 | SM(0, IEEE80211_BASEQ_FRAG) 1921 ; 1922 ADDSHORT(frm, barctl); 1923 ADDSHORT(frm, barseqctl); 1924 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1925 1926 M_WME_SETAC(m, WME_AC_VO); 1927 1928 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 1929 1930 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1931 ni, "send bar frame (tid %u start %u) on channel %u", 1932 tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan)); 1933 1934 return ic->ic_raw_xmit(ni, m, NULL); 1935bad: 1936 ieee80211_free_node(ni); 1937 return ret; 1938#undef ADDSHORT 1939#undef senderr 1940} 1941 1942/* 1943 * Send an action management frame. The arguments are stuff 1944 * into a frame without inspection; the caller is assumed to 1945 * prepare them carefully (e.g. based on the aggregation state). 1946 */ 1947int 1948ieee80211_send_action(struct ieee80211_node *ni, 1949 int category, int action, uint16_t args[4]) 1950{ 1951#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1952#define ADDSHORT(frm, v) do { \ 1953 frm[0] = (v) & 0xff; \ 1954 frm[1] = (v) >> 8; \ 1955 frm += 2; \ 1956} while (0) 1957 struct ieee80211vap *vap = ni->ni_vap; 1958 struct ieee80211com *ic = ni->ni_ic; 1959 struct mbuf *m; 1960 uint8_t *frm; 1961 uint16_t baparamset; 1962 int ret; 1963 1964 KASSERT(ni != NULL, ("null node")); 1965 1966 /* 1967 * Hold a reference on the node so it doesn't go away until after 1968 * the xmit is complete all the way in the driver. On error we 1969 * will remove our reference. 1970 */ 1971 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1972 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1973 __func__, __LINE__, 1974 ni, ether_sprintf(ni->ni_macaddr), 1975 ieee80211_node_refcnt(ni)+1); 1976 ieee80211_ref_node(ni); 1977 1978 m = ieee80211_getmgtframe(&frm, 1979 ic->ic_headroom + sizeof(struct ieee80211_frame), 1980 sizeof(uint16_t) /* action+category */ 1981 /* XXX may action payload */ 1982 + sizeof(struct ieee80211_action_ba_addbaresponse) 1983 ); 1984 if (m == NULL) 1985 senderr(ENOMEM, is_tx_nobuf); 1986 1987 *frm++ = category; 1988 *frm++ = action; 1989 switch (category) { 1990 case IEEE80211_ACTION_CAT_BA: 1991 switch (action) { 1992 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1993 IEEE80211_NOTE(vap, 1994 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1995 "send ADDBA request: dialogtoken %d " 1996 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 1997 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 1998 args[2], args[3]); 1999 2000 *frm++ = args[0]; /* dialog token */ 2001 ADDSHORT(frm, args[1]); /* baparamset */ 2002 ADDSHORT(frm, args[2]); /* batimeout */ 2003 ADDSHORT(frm, args[3]); /* baseqctl */ 2004 break; 2005 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 2006 IEEE80211_NOTE(vap, 2007 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2008 "send ADDBA response: dialogtoken %d status %d " 2009 "baparamset 0x%x (tid %d) batimeout %d", 2010 args[0], args[1], args[2], 2011 MS(args[2], IEEE80211_BAPS_TID), args[3]); 2012 2013 *frm++ = args[0]; /* dialog token */ 2014 ADDSHORT(frm, args[1]); /* statuscode */ 2015 ADDSHORT(frm, args[2]); /* baparamset */ 2016 ADDSHORT(frm, args[3]); /* batimeout */ 2017 break; 2018 case IEEE80211_ACTION_BA_DELBA: 2019 /* XXX */ 2020 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 2021 | args[1] 2022 ; 2023 ADDSHORT(frm, baparamset); 2024 ADDSHORT(frm, args[2]); /* reason code */ 2025 2026 IEEE80211_NOTE(vap, 2027 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2028 "send DELBA action: tid %d, initiator %d reason %d", 2029 args[0], args[1], args[2]); 2030 break; 2031 default: 2032 goto badaction; 2033 } 2034 break; 2035 case IEEE80211_ACTION_CAT_HT: 2036 switch (action) { 2037 case IEEE80211_ACTION_HT_TXCHWIDTH: 2038 IEEE80211_NOTE(vap, 2039 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2040 ni, "send HT txchwidth: width %d", 2041 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20 2042 ); 2043 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 2044 IEEE80211_A_HT_TXCHWIDTH_2040 : 2045 IEEE80211_A_HT_TXCHWIDTH_20; 2046 break; 2047 default: 2048 goto badaction; 2049 } 2050 break; 2051 default: 2052 badaction: 2053 IEEE80211_NOTE(vap, 2054 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2055 "%s: unsupported category %d action %d", __func__, 2056 category, action); 2057 senderr(EINVAL, is_tx_unknownmgt); 2058 /* NOTREACHED */ 2059 } 2060 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2061 2062 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION); 2063bad: 2064 ieee80211_free_node(ni); 2065 if (m != NULL) 2066 m_freem(m); 2067 return ret; 2068#undef ADDSHORT 2069#undef senderr 2070} 2071 2072/* 2073 * Construct the MCS bit mask for inclusion 2074 * in an HT information element. 2075 */ 2076static void 2077ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2078{ 2079 int i; 2080 2081 for (i = 0; i < rs->rs_nrates; i++) { 2082 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2083 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 2084 /* NB: this assumes a particular implementation */ 2085 setbit(frm, r); 2086 } 2087 } 2088} 2089 2090/* 2091 * Add body of an HTCAP information element. 2092 */ 2093static uint8_t * 2094ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 2095{ 2096#define ADDSHORT(frm, v) do { \ 2097 frm[0] = (v) & 0xff; \ 2098 frm[1] = (v) >> 8; \ 2099 frm += 2; \ 2100} while (0) 2101 struct ieee80211vap *vap = ni->ni_vap; 2102 uint16_t caps; 2103 int rxmax, density; 2104 2105 /* HT capabilities */ 2106 caps = vap->iv_htcaps & 0xffff; 2107 /* 2108 * Note channel width depends on whether we are operating as 2109 * a sta or not. When operating as a sta we are generating 2110 * a request based on our desired configuration. Otherwise 2111 * we are operational and the channel attributes identify 2112 * how we've been setup (which might be different if a fixed 2113 * channel is specified). 2114 */ 2115 if (vap->iv_opmode == IEEE80211_M_STA) { 2116 /* override 20/40 use based on config */ 2117 if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) 2118 caps |= IEEE80211_HTCAP_CHWIDTH40; 2119 else 2120 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2121 /* use advertised setting (XXX locally constraint) */ 2122 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 2123 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 2124 } else { 2125 /* override 20/40 use based on current channel */ 2126 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2127 caps |= IEEE80211_HTCAP_CHWIDTH40; 2128 else 2129 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2130 rxmax = vap->iv_ampdu_rxmax; 2131 density = vap->iv_ampdu_density; 2132 } 2133 /* adjust short GI based on channel and config */ 2134 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 2135 caps &= ~IEEE80211_HTCAP_SHORTGI20; 2136 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 2137 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 2138 caps &= ~IEEE80211_HTCAP_SHORTGI40; 2139 ADDSHORT(frm, caps); 2140 2141 /* HT parameters */ 2142 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 2143 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 2144 ; 2145 frm++; 2146 2147 /* pre-zero remainder of ie */ 2148 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 2149 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 2150 2151 /* supported MCS set */ 2152 /* 2153 * XXX it would better to get the rate set from ni_htrates 2154 * so we can restrict it but for sta mode ni_htrates isn't 2155 * setup when we're called to form an AssocReq frame so for 2156 * now we're restricted to the default HT rate set. 2157 */ 2158 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 2159 2160 frm += sizeof(struct ieee80211_ie_htcap) - 2161 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 2162 return frm; 2163#undef ADDSHORT 2164} 2165 2166/* 2167 * Add 802.11n HT capabilities information element 2168 */ 2169uint8_t * 2170ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2171{ 2172 frm[0] = IEEE80211_ELEMID_HTCAP; 2173 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2174 return ieee80211_add_htcap_body(frm + 2, ni); 2175} 2176 2177/* 2178 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2179 * used for compatibility w/ pre-draft implementations. 2180 */ 2181uint8_t * 2182ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2183{ 2184 frm[0] = IEEE80211_ELEMID_VENDOR; 2185 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2186 frm[2] = (BCM_OUI >> 0) & 0xff; 2187 frm[3] = (BCM_OUI >> 8) & 0xff; 2188 frm[4] = (BCM_OUI >> 16) & 0xff; 2189 frm[5] = BCM_OUI_HTCAP; 2190 return ieee80211_add_htcap_body(frm + 6, ni); 2191} 2192 2193/* 2194 * Construct the MCS bit mask of basic rates 2195 * for inclusion in an HT information element. 2196 */ 2197static void 2198ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2199{ 2200 int i; 2201 2202 for (i = 0; i < rs->rs_nrates; i++) { 2203 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2204 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2205 r < IEEE80211_HTRATE_MAXSIZE) { 2206 /* NB: this assumes a particular implementation */ 2207 setbit(frm, r); 2208 } 2209 } 2210} 2211 2212/* 2213 * Update the HTINFO ie for a beacon frame. 2214 */ 2215void 2216ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2217 struct ieee80211_beacon_offsets *bo) 2218{ 2219#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2220 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2221 struct ieee80211com *ic = vap->iv_ic; 2222 struct ieee80211_ie_htinfo *ht = 2223 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2224 2225 /* XXX only update on channel change */ 2226 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2227 if (vap->iv_flags_ext & IEEE80211_FEXT_RIFS) 2228 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM; 2229 else 2230 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2231 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2232 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2233 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2234 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2235 else 2236 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2237 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2238 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2239 2240 /* protection mode */ 2241 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2242 2243 /* XXX propagate to vendor ie's */ 2244#undef PROTMODE 2245} 2246 2247/* 2248 * Add body of an HTINFO information element. 2249 * 2250 * NB: We don't use struct ieee80211_ie_htinfo because we can 2251 * be called to fillin both a standard ie and a compat ie that 2252 * has a vendor OUI at the front. 2253 */ 2254static uint8_t * 2255ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2256{ 2257 struct ieee80211vap *vap = ni->ni_vap; 2258 struct ieee80211com *ic = ni->ni_ic; 2259 2260 /* pre-zero remainder of ie */ 2261 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2262 2263 /* primary/control channel center */ 2264 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2265 2266 if (vap->iv_flags_ext & IEEE80211_FEXT_RIFS) 2267 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM; 2268 else 2269 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2270 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2271 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2272 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2273 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2274 else 2275 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2276 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2277 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2278 2279 frm[1] = ic->ic_curhtprotmode; 2280 2281 frm += 5; 2282 2283 /* basic MCS set */ 2284 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2285 frm += sizeof(struct ieee80211_ie_htinfo) - 2286 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2287 return frm; 2288} 2289 2290/* 2291 * Add 802.11n HT information information element. 2292 */ 2293uint8_t * 2294ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2295{ 2296 frm[0] = IEEE80211_ELEMID_HTINFO; 2297 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2298 return ieee80211_add_htinfo_body(frm + 2, ni); 2299} 2300 2301/* 2302 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2303 * used for compatibility w/ pre-draft implementations. 2304 */ 2305uint8_t * 2306ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2307{ 2308 frm[0] = IEEE80211_ELEMID_VENDOR; 2309 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2310 frm[2] = (BCM_OUI >> 0) & 0xff; 2311 frm[3] = (BCM_OUI >> 8) & 0xff; 2312 frm[4] = (BCM_OUI >> 16) & 0xff; 2313 frm[5] = BCM_OUI_HTINFO; 2314 return ieee80211_add_htinfo_body(frm + 6, ni); 2315} 2316