ieee80211_ht.c revision 178953
134192Sjdp/*- 234192Sjdp * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 334192Sjdp * All rights reserved. 434192Sjdp * 534192Sjdp * Redistribution and use in source and binary forms, with or without 634192Sjdp * modification, are permitted provided that the following conditions 734192Sjdp * are met: 834192Sjdp * 1. Redistributions of source code must retain the above copyright 934192Sjdp * notice, this list of conditions and the following disclaimer. 1034192Sjdp * 2. Redistributions in binary form must reproduce the above copyright 1134192Sjdp * notice, this list of conditions and the following disclaimer in the 1234192Sjdp * documentation and/or other materials provided with the distribution. 1334192Sjdp * 1434192Sjdp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1534192Sjdp * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1634192Sjdp * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1734192Sjdp * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1834192Sjdp * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 1934192Sjdp * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2034192Sjdp * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2134192Sjdp * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2234192Sjdp * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2334192Sjdp * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2434192Sjdp */ 2550476Speter 2634192Sjdp#include <sys/cdefs.h> 2734192Sjdp#ifdef __FreeBSD__ 2834192Sjdp__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_ht.c 178953 2008-05-11 23:27:57Z sam $"); 2934192Sjdp#endif 3034192Sjdp 3134192Sjdp/* 3234192Sjdp * IEEE 802.11n protocol support. 3334192Sjdp */ 3434192Sjdp 35146370Sdfr#include "opt_inet.h" 36146370Sdfr#include "opt_wlan.h" 37146370Sdfr 3838816Sdfr#include <sys/param.h> 3938816Sdfr#include <sys/kernel.h> 4038816Sdfr#include <sys/systm.h> 41146370Sdfr#include <sys/endian.h> 4238816Sdfr 4338816Sdfr#include <sys/socket.h> 4434192Sjdp 4534192Sjdp#include <net/if.h> 46146370Sdfr#include <net/if_media.h> 4734192Sjdp#include <net/ethernet.h> 48146370Sdfr 4934192Sjdp#include <net80211/ieee80211_var.h> 5034192Sjdp#include <net80211/ieee80211_input.h> 5134192Sjdp 5234192Sjdp/* define here, used throughout file */ 5334192Sjdp#define MS(_v, _f) (((_v) & _f) >> _f##_S) 5434192Sjdp#define SM(_v, _f) (((_v) << _f##_S) & _f) 5534192Sjdp 5634192Sjdpconst struct ieee80211_mcs_rates ieee80211_htrates[16] = { 5734192Sjdp { 13, 14, 27, 30 }, /* MCS 0 */ 5834192Sjdp { 26, 29, 54, 60 }, /* MCS 1 */ 5934192Sjdp { 39, 43, 81, 90 }, /* MCS 2 */ 6034192Sjdp { 52, 58, 108, 120 }, /* MCS 3 */ 6134192Sjdp { 78, 87, 162, 180 }, /* MCS 4 */ 6234192Sjdp { 104, 116, 216, 240 }, /* MCS 5 */ 6334192Sjdp { 117, 130, 243, 270 }, /* MCS 6 */ 6434192Sjdp { 130, 144, 270, 300 }, /* MCS 7 */ 6534192Sjdp { 26, 29, 54, 60 }, /* MCS 8 */ 66226436Seadler { 52, 58, 108, 120 }, /* MCS 9 */ 6734192Sjdp { 78, 87, 162, 180 }, /* MCS 10 */ 6834192Sjdp { 104, 116, 216, 240 }, /* MCS 11 */ 6934192Sjdp { 156, 173, 324, 360 }, /* MCS 12 */ 7034192Sjdp { 208, 231, 432, 480 }, /* MCS 13 */ 7134192Sjdp { 234, 260, 486, 540 }, /* MCS 14 */ 7234192Sjdp { 260, 289, 540, 600 } /* MCS 15 */ 7334192Sjdp}; 7434192Sjdp 7534192Sjdpstatic const struct ieee80211_htrateset ieee80211_rateset_11n = 7634192Sjdp { 16, { 7734192Sjdp 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 7834192Sjdp 10, 11, 12, 13, 14, 15 } 7934192Sjdp }; 8034192Sjdp 8134192Sjdp#ifdef IEEE80211_AMPDU_AGE 8234192Sjdp/* XXX public for sysctl hookup */ 8334192Sjdpint ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 8434192Sjdp#endif 8534192Sjdpint ieee80211_recv_bar_ena = 1; 8634192Sjdpint ieee80211_addba_timeout = -1; /* timeout waiting for ADDBA response */ 8734192Sjdpint ieee80211_addba_backoff = -1; /* backoff after max ADDBA requests */ 8834192Sjdpint ieee80211_addba_maxtries = 3; /* max ADDBA requests before backoff */ 8934192Sjdp 9034192Sjdp/* 9134192Sjdp * Setup HT parameters that depends on the clock frequency. 92217103Skib */ 93217103Skibstatic 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 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 170 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_RX; 171 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU) 172 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_TX; 173 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_RX; 174 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU) 175 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_TX; 176 } 177 /* NB: disable default legacy WDS, too many issues right now */ 178 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) 179 vap->iv_flags_ext &= ~IEEE80211_FEXT_HT; 180} 181 182void 183ieee80211_ht_vdetach(struct ieee80211vap *vap) 184{ 185} 186 187static void 188ht_announce(struct ieee80211com *ic, int mode, 189 const struct ieee80211_htrateset *rs) 190{ 191 struct ifnet *ifp = ic->ic_ifp; 192 int i, rate, mword; 193 194 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]); 195 for (i = 0; i < rs->rs_nrates; i++) { 196 mword = ieee80211_rate2media(ic, 197 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode); 198 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 199 continue; 200 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns; 201 printf("%s%d%sMbps", (i != 0 ? " " : ""), 202 rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); 203 } 204 printf("\n"); 205} 206 207void 208ieee80211_ht_announce(struct ieee80211com *ic) 209{ 210 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 211 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n); 212 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 213 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n); 214} 215 216const struct ieee80211_htrateset * 217ieee80211_get_suphtrates(struct ieee80211com *ic, 218 const struct ieee80211_channel *c) 219{ 220 return &ieee80211_rateset_11n; 221} 222 223/* 224 * Receive processing. 225 */ 226 227/* 228 * Decap the encapsulated A-MSDU frames and dispatch all but 229 * the last for delivery. The last frame is returned for 230 * delivery via the normal path. 231 */ 232struct mbuf * 233ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 234{ 235 struct ieee80211vap *vap = ni->ni_vap; 236 int framelen; 237 struct mbuf *n; 238 239 /* discard 802.3 header inserted by ieee80211_decap */ 240 m_adj(m, sizeof(struct ether_header)); 241 242 vap->iv_stats.is_amsdu_decap++; 243 244 for (;;) { 245 /* 246 * Decap the first frame, bust it apart from the 247 * remainder and deliver. We leave the last frame 248 * delivery to the caller (for consistency with other 249 * code paths, could also do it here). 250 */ 251 m = ieee80211_decap1(m, &framelen); 252 if (m == NULL) { 253 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 254 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 255 vap->iv_stats.is_amsdu_tooshort++; 256 return NULL; 257 } 258 if (m->m_pkthdr.len == framelen) 259 break; 260 n = m_split(m, framelen, M_NOWAIT); 261 if (n == NULL) { 262 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 263 ni->ni_macaddr, "a-msdu", 264 "%s", "unable to split encapsulated frames"); 265 vap->iv_stats.is_amsdu_split++; 266 m_freem(m); /* NB: must reclaim */ 267 return NULL; 268 } 269 vap->iv_deliver_data(vap, ni, m); 270 271 /* 272 * Remove frame contents; each intermediate frame 273 * is required to be aligned to a 4-byte boundary. 274 */ 275 m = n; 276 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 277 } 278 return m; /* last delivered by caller */ 279} 280 281/* 282 * Purge all frames in the A-MPDU re-order queue. 283 */ 284static void 285ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 286{ 287 struct mbuf *m; 288 int i; 289 290 for (i = 0; i < rap->rxa_wnd; i++) { 291 m = rap->rxa_m[i]; 292 if (m != NULL) { 293 rap->rxa_m[i] = NULL; 294 rap->rxa_qbytes -= m->m_pkthdr.len; 295 m_freem(m); 296 if (--rap->rxa_qframes == 0) 297 break; 298 } 299 } 300 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 301 ("lost %u data, %u frames on ampdu rx q", 302 rap->rxa_qbytes, rap->rxa_qframes)); 303} 304 305/* 306 * Start A-MPDU rx/re-order processing for the specified TID. 307 */ 308static void 309ampdu_rx_start(struct ieee80211_rx_ampdu *rap, int bufsiz, int start) 310{ 311 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) { 312 /* 313 * AMPDU previously setup and not terminated with a DELBA, 314 * flush the reorder q's in case anything remains. 315 */ 316 ampdu_rx_purge(rap); 317 } 318 memset(rap, 0, sizeof(*rap)); 319 rap->rxa_wnd = (bufsiz == 0) ? 320 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 321 rap->rxa_start = start; 322 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND; 323} 324 325/* 326 * Stop A-MPDU rx processing for the specified TID. 327 */ 328static void 329ampdu_rx_stop(struct ieee80211_rx_ampdu *rap) 330{ 331 ampdu_rx_purge(rap); 332 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND); 333} 334 335/* 336 * Dispatch a frame from the A-MPDU reorder queue. The 337 * frame is fed back into ieee80211_input marked with an 338 * M_AMPDU flag so it doesn't come back to us (it also 339 * permits ieee80211_input to optimize re-processing). 340 */ 341static __inline void 342ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 343{ 344 m->m_flags |= M_AMPDU; /* bypass normal processing */ 345 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU set */ 346 (void) ieee80211_input(ni, m, 0, 0, 0); 347} 348 349/* 350 * Dispatch as many frames as possible from the re-order queue. 351 * Frames will always be "at the front"; we process all frames 352 * up to the first empty slot in the window. On completion we 353 * cleanup state if there are still pending frames in the current 354 * BA window. We assume the frame at slot 0 is already handled 355 * by the caller; we always start at slot 1. 356 */ 357static void 358ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 359{ 360 struct ieee80211vap *vap = ni->ni_vap; 361 struct mbuf *m; 362 int i; 363 364 /* flush run of frames */ 365 for (i = 1; i < rap->rxa_wnd; i++) { 366 m = rap->rxa_m[i]; 367 if (m == NULL) 368 break; 369 rap->rxa_m[i] = NULL; 370 rap->rxa_qbytes -= m->m_pkthdr.len; 371 rap->rxa_qframes--; 372 373 ampdu_dispatch(ni, m); 374 } 375 /* 376 * If frames remain, copy the mbuf pointers down so 377 * they correspond to the offsets in the new window. 378 */ 379 if (rap->rxa_qframes != 0) { 380 int n = rap->rxa_qframes, j; 381 for (j = i+1; j < rap->rxa_wnd; j++) { 382 if (rap->rxa_m[j] != NULL) { 383 rap->rxa_m[j-i] = rap->rxa_m[j]; 384 rap->rxa_m[j] = NULL; 385 if (--n == 0) 386 break; 387 } 388 } 389 KASSERT(n == 0, ("lost %d frames", n)); 390 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 391 } 392 /* 393 * Adjust the start of the BA window to 394 * reflect the frames just dispatched. 395 */ 396 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 397 vap->iv_stats.is_ampdu_rx_oor += i; 398} 399 400#ifdef IEEE80211_AMPDU_AGE 401/* 402 * Dispatch all frames in the A-MPDU re-order queue. 403 */ 404static void 405ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 406{ 407 struct ieee80211vap *vap = ni->ni_vap; 408 struct mbuf *m; 409 int i; 410 411 for (i = 0; i < rap->rxa_wnd; i++) { 412 m = rap->rxa_m[i]; 413 if (m == NULL) 414 continue; 415 rap->rxa_m[i] = NULL; 416 rap->rxa_qbytes -= m->m_pkthdr.len; 417 rap->rxa_qframes--; 418 vap->iv_stats.is_ampdu_rx_oor++; 419 420 ampdu_dispatch(ni, m); 421 if (rap->rxa_qframes == 0) 422 break; 423 } 424} 425#endif /* IEEE80211_AMPDU_AGE */ 426 427/* 428 * Dispatch all frames in the A-MPDU re-order queue 429 * preceding the specified sequence number. This logic 430 * handles window moves due to a received MSDU or BAR. 431 */ 432static void 433ampdu_rx_flush_upto(struct ieee80211_node *ni, 434 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 435{ 436 struct ieee80211vap *vap = ni->ni_vap; 437 struct mbuf *m; 438 ieee80211_seq seqno; 439 int i; 440 441 /* 442 * Flush any complete MSDU's with a sequence number lower 443 * than winstart. Gaps may exist. Note that we may actually 444 * dispatch frames past winstart if a run continues; this is 445 * an optimization that avoids having to do a separate pass 446 * to dispatch frames after moving the BA window start. 447 */ 448 seqno = rap->rxa_start; 449 for (i = 0; i < rap->rxa_wnd; i++) { 450 m = rap->rxa_m[i]; 451 if (m != NULL) { 452 rap->rxa_m[i] = NULL; 453 rap->rxa_qbytes -= m->m_pkthdr.len; 454 rap->rxa_qframes--; 455 vap->iv_stats.is_ampdu_rx_oor++; 456 457 ampdu_dispatch(ni, m); 458 } else { 459 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 460 break; 461 } 462 seqno = IEEE80211_SEQ_INC(seqno); 463 } 464 /* 465 * If frames remain, copy the mbuf pointers down so 466 * they correspond to the offsets in the new window. 467 */ 468 if (rap->rxa_qframes != 0) { 469 int n = rap->rxa_qframes, j; 470 471 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */ 472 KASSERT(rap->rxa_m[0] == NULL, 473 ("%s: BA window slot 0 occupied", __func__)); 474 for (j = i+1; j < rap->rxa_wnd; j++) { 475 if (rap->rxa_m[j] != NULL) { 476 rap->rxa_m[j-i] = rap->rxa_m[j]; 477 rap->rxa_m[j] = NULL; 478 if (--n == 0) 479 break; 480 } 481 } 482 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 483 "BA win <%d:%d> winstart %d", 484 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 485 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 486 winstart)); 487 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 488 } 489 /* 490 * Move the start of the BA window; we use the 491 * sequence number of the last MSDU that was 492 * passed up the stack+1 or winstart if stopped on 493 * a gap in the reorder buffer. 494 */ 495 rap->rxa_start = seqno; 496} 497 498/* 499 * Process a received QoS data frame for an HT station. Handle 500 * A-MPDU reordering: if this frame is received out of order 501 * and falls within the BA window hold onto it. Otherwise if 502 * this frame completes a run, flush any pending frames. We 503 * return 1 if the frame is consumed. A 0 is returned if 504 * the frame should be processed normally by the caller. 505 */ 506int 507ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 508{ 509#define IEEE80211_FC0_QOSDATA \ 510 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 511#define PROCESS 0 /* caller should process frame */ 512#define CONSUMED 1 /* frame consumed, caller does nothing */ 513 struct ieee80211vap *vap = ni->ni_vap; 514 struct ieee80211_qosframe *wh; 515 struct ieee80211_rx_ampdu *rap; 516 ieee80211_seq rxseq; 517 uint8_t tid; 518 int off; 519 520 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 521 522 /* NB: m_len known to be sufficient */ 523 wh = mtod(m, struct ieee80211_qosframe *); 524 KASSERT(wh->i_fc[0] == IEEE80211_FC0_QOSDATA, ("not QoS data")); 525 526 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 527 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 528 else 529 tid = wh->i_qos[0]; 530 tid &= IEEE80211_QOS_TID; 531 rap = &ni->ni_rx_ampdu[tid]; 532 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 533 /* 534 * No ADDBA request yet, don't touch. 535 */ 536 return PROCESS; 537 } 538 rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 539 rap->rxa_nframes++; 540again: 541 if (rxseq == rap->rxa_start) { 542 /* 543 * First frame in window. 544 */ 545 if (rap->rxa_qframes != 0) { 546 /* 547 * Dispatch as many packets as we can. 548 */ 549 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 550 ampdu_dispatch(ni, m); 551 ampdu_rx_dispatch(rap, ni); 552 return CONSUMED; 553 } else { 554 /* 555 * In order; advance window and notify 556 * caller to dispatch directly. 557 */ 558 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 559 return PROCESS; 560 } 561 } 562 /* 563 * Frame is out of order; store if in the BA window. 564 */ 565 /* calculate offset in BA window */ 566 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 567 if (off < rap->rxa_wnd) { 568 /* 569 * Common case (hopefully): in the BA window. 570 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 571 */ 572#ifdef IEEE80211_AMPDU_AGE 573 /* 574 * Check for frames sitting too long in the reorder queue. 575 * This should only ever happen if frames are not delivered 576 * without the sender otherwise notifying us (e.g. with a 577 * BAR to move the window). Typically this happens because 578 * of vendor bugs that cause the sequence number to jump. 579 * When this happens we get a gap in the reorder queue that 580 * leaves frame sitting on the queue until they get pushed 581 * out due to window moves. When the vendor does not send 582 * BAR this move only happens due to explicit packet sends 583 * 584 * NB: we only track the time of the oldest frame in the 585 * reorder q; this means that if we flush we might push 586 * frames that still "new"; if this happens then subsequent 587 * frames will result in BA window moves which cost something 588 * but is still better than a big throughput dip. 589 */ 590 if (rap->rxa_qframes != 0) { 591 /* XXX honor batimeout? */ 592 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 593 /* 594 * Too long since we received the first 595 * frame; flush the reorder buffer. 596 */ 597 if (rap->rxa_qframes != 0) { 598 vap->iv_stats.is_ampdu_rx_age += 599 rap->rxa_qframes; 600 ampdu_rx_flush(ni, rap); 601 } 602 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 603 return PROCESS; 604 } 605 } else { 606 /* 607 * First frame, start aging timer. 608 */ 609 rap->rxa_age = ticks; 610 } 611#endif /* IEEE80211_AMPDU_AGE */ 612 /* save packet */ 613 if (rap->rxa_m[off] == NULL) { 614 rap->rxa_m[off] = m; 615 rap->rxa_qframes++; 616 rap->rxa_qbytes += m->m_pkthdr.len; 617 vap->iv_stats.is_ampdu_rx_reorder++; 618 } else { 619 IEEE80211_DISCARD_MAC(vap, 620 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 621 ni->ni_macaddr, "a-mpdu duplicate", 622 "seqno %u tid %u BA win <%u:%u>", 623 rxseq, tid, rap->rxa_start, 624 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 625 vap->iv_stats.is_rx_dup++; 626 IEEE80211_NODE_STAT(ni, rx_dup); 627 m_freem(m); 628 } 629 return CONSUMED; 630 } 631 if (off < IEEE80211_SEQ_BA_RANGE) { 632 /* 633 * Outside the BA window, but within range; 634 * flush the reorder q and move the window. 635 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 636 */ 637 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 638 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 639 rap->rxa_start, 640 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 641 rap->rxa_qframes, rxseq, tid); 642 vap->iv_stats.is_ampdu_rx_move++; 643 644 /* 645 * The spec says to flush frames up to but not including: 646 * WinStart_B = rxseq - rap->rxa_wnd + 1 647 * Then insert the frame or notify the caller to process 648 * it immediately. We can safely do this by just starting 649 * over again because we know the frame will now be within 650 * the BA window. 651 */ 652 /* NB: rxa_wnd known to be >0 */ 653 ampdu_rx_flush_upto(ni, rap, 654 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 655 goto again; 656 } else { 657 /* 658 * Outside the BA window and out of range; toss. 659 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 660 */ 661 IEEE80211_DISCARD_MAC(vap, 662 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 663 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 664 rap->rxa_start, 665 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 666 rap->rxa_qframes, rxseq, tid, 667 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 668 vap->iv_stats.is_ampdu_rx_drop++; 669 IEEE80211_NODE_STAT(ni, rx_drop); 670 m_freem(m); 671 return CONSUMED; 672 } 673#undef CONSUMED 674#undef PROCESS 675#undef IEEE80211_FC0_QOSDATA 676} 677 678/* 679 * Process a BAR ctl frame. Dispatch all frames up to 680 * the sequence number of the frame. If this frame is 681 * out of range it's discarded. 682 */ 683void 684ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 685{ 686 struct ieee80211vap *vap = ni->ni_vap; 687 struct ieee80211_frame_bar *wh; 688 struct ieee80211_rx_ampdu *rap; 689 ieee80211_seq rxseq; 690 int tid, off; 691 692 if (!ieee80211_recv_bar_ena) { 693#if 0 694 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 695 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 696#endif 697 vap->iv_stats.is_ampdu_bar_bad++; 698 return; 699 } 700 wh = mtod(m0, struct ieee80211_frame_bar *); 701 /* XXX check basic BAR */ 702 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 703 rap = &ni->ni_rx_ampdu[tid]; 704 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 705 /* 706 * No ADDBA request yet, don't touch. 707 */ 708 IEEE80211_DISCARD_MAC(vap, 709 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 710 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 711 vap->iv_stats.is_ampdu_bar_bad++; 712 return; 713 } 714 vap->iv_stats.is_ampdu_bar_rx++; 715 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 716 if (rxseq == rap->rxa_start) 717 return; 718 /* calculate offset in BA window */ 719 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 720 if (off < IEEE80211_SEQ_BA_RANGE) { 721 /* 722 * Flush the reorder q up to rxseq and move the window. 723 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 724 */ 725 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 726 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 727 rap->rxa_start, 728 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 729 rap->rxa_qframes, rxseq, tid); 730 vap->iv_stats.is_ampdu_bar_move++; 731 732 ampdu_rx_flush_upto(ni, rap, rxseq); 733 if (off >= rap->rxa_wnd) { 734 /* 735 * BAR specifies a window start to the right of BA 736 * window; we must move it explicitly since 737 * ampdu_rx_flush_upto will not. 738 */ 739 rap->rxa_start = rxseq; 740 } 741 } else { 742 /* 743 * Out of range; toss. 744 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 745 */ 746 IEEE80211_DISCARD_MAC(vap, 747 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 748 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 749 rap->rxa_start, 750 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 751 rap->rxa_qframes, rxseq, tid, 752 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 753 vap->iv_stats.is_ampdu_bar_oow++; 754 IEEE80211_NODE_STAT(ni, rx_drop); 755 } 756} 757 758/* 759 * Setup HT-specific state in a node. Called only 760 * when HT use is negotiated so we don't do extra 761 * work for temporary and/or legacy sta's. 762 */ 763void 764ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap) 765{ 766 struct ieee80211_tx_ampdu *tap; 767 int ac; 768 769 if (ni->ni_flags & IEEE80211_NODE_HT) { 770 /* 771 * Clean AMPDU state on re-associate. This handles the case 772 * where a station leaves w/o notifying us and then returns 773 * before node is reaped for inactivity. 774 */ 775 ieee80211_ht_node_cleanup(ni); 776 } 777 ieee80211_parse_htcap(ni, htcap); 778 for (ac = 0; ac < WME_NUM_AC; ac++) { 779 tap = &ni->ni_tx_ampdu[ac]; 780 tap->txa_ac = ac; 781 /* NB: further initialization deferred */ 782 } 783 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 784} 785 786/* 787 * Cleanup HT-specific state in a node. Called only 788 * when HT use has been marked. 789 */ 790void 791ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 792{ 793 struct ieee80211com *ic = ni->ni_ic; 794 int i; 795 796 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 797 798 /* XXX optimize this */ 799 for (i = 0; i < WME_NUM_AC; i++) { 800 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 801 if (tap->txa_flags & IEEE80211_AGGR_SETUP) { 802 /* 803 * Stop BA stream if setup so driver has a chance 804 * to reclaim any resources it might have allocated. 805 */ 806 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]); 807 IEEE80211_TAPQ_DESTROY(tap); 808 tap->txa_lastsample = 0; 809 tap->txa_avgpps = 0; 810 /* NB: clearing NAK means we may re-send ADDBA */ 811 tap->txa_flags &= 812 ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 813 } 814 } 815 for (i = 0; i < WME_NUM_TID; i++) 816 ampdu_rx_stop(&ni->ni_rx_ampdu[i]); 817 818 ni->ni_htcap = 0; 819 ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT | 820 IEEE80211_NODE_AMPDU); 821} 822 823/* 824 * Age out HT resources for a station. 825 */ 826void 827ieee80211_ht_node_age(struct ieee80211_node *ni) 828{ 829#ifdef IEEE80211_AMPDU_AGE 830 struct ieee80211vap *vap = ni->ni_vap; 831 uint8_t tid; 832#endif 833 834 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 835 836#ifdef IEEE80211_AMPDU_AGE 837 for (tid = 0; tid < WME_NUM_TID; tid++) { 838 struct ieee80211_rx_ampdu *rap; 839 840 rap = &ni->ni_rx_ampdu[tid]; 841 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 842 continue; 843 if (rap->rxa_qframes == 0) 844 continue; 845 /* 846 * Check for frames sitting too long in the reorder queue. 847 * See above for more details on what's happening here. 848 */ 849 /* XXX honor batimeout? */ 850 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 851 /* 852 * Too long since we received the first 853 * frame; flush the reorder buffer. 854 */ 855 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 856 ampdu_rx_flush(ni, rap); 857 } 858 } 859#endif /* IEEE80211_AMPDU_AGE */ 860} 861 862static struct ieee80211_channel * 863findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 864{ 865 return ieee80211_find_channel(ic, c->ic_freq, 866 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 867} 868 869/* 870 * Adjust a channel to be HT/non-HT according to the vap's configuration. 871 */ 872struct ieee80211_channel * 873ieee80211_ht_adjust_channel(struct ieee80211com *ic, 874 struct ieee80211_channel *chan, int flags) 875{ 876 struct ieee80211_channel *c; 877 878 if (flags & IEEE80211_FEXT_HT) { 879 /* promote to HT if possible */ 880 if (flags & IEEE80211_FEXT_USEHT40) { 881 if (!IEEE80211_IS_CHAN_HT40(chan)) { 882 /* NB: arbitrarily pick ht40+ over ht40- */ 883 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 884 if (c == NULL) 885 c = findhtchan(ic, chan, 886 IEEE80211_CHAN_HT40D); 887 if (c == NULL) 888 c = findhtchan(ic, chan, 889 IEEE80211_CHAN_HT20); 890 if (c != NULL) 891 chan = c; 892 } 893 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 894 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 895 if (c != NULL) 896 chan = c; 897 } 898 } else if (IEEE80211_IS_CHAN_HT(chan)) { 899 /* demote to legacy, HT use is disabled */ 900 c = ieee80211_find_channel(ic, chan->ic_freq, 901 chan->ic_flags &~ IEEE80211_CHAN_HT); 902 if (c != NULL) 903 chan = c; 904 } 905 return chan; 906} 907 908/* 909 * Setup HT-specific state for a legacy WDS peer. 910 */ 911void 912ieee80211_ht_wds_init(struct ieee80211_node *ni) 913{ 914 struct ieee80211vap *vap = ni->ni_vap; 915 struct ieee80211_tx_ampdu *tap; 916 int ac; 917 918 KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested")); 919 920 /* XXX check scan cache in case peer has an ap and we have info */ 921 /* 922 * If setup with a legacy channel; locate an HT channel. 923 * Otherwise if the inherited channel (from a companion 924 * AP) is suitable use it so we use the same location 925 * for the extension channel). 926 */ 927 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 928 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 929 930 ni->ni_htcap = 0; 931 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) 932 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 933 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 934 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 935 ni->ni_chw = 40; 936 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 937 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 938 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 939 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 940 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) 941 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 942 } else { 943 ni->ni_chw = 20; 944 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 945 } 946 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 947 948 ni->ni_htopmode = 0; /* XXX need protection state */ 949 ni->ni_htstbc = 0; /* XXX need info */ 950 951 for (ac = 0; ac < WME_NUM_AC; ac++) { 952 tap = &ni->ni_tx_ampdu[ac]; 953 tap->txa_ac = ac; 954 } 955 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */ 956 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 957} 958 959/* 960 * Notify hostap vaps of a change in the HTINFO ie. 961 */ 962static void 963htinfo_notify(struct ieee80211com *ic) 964{ 965 struct ieee80211vap *vap; 966 int first = 1; 967 968 IEEE80211_LOCK_ASSERT(ic); 969 970 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 971 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 972 continue; 973 if (first) { 974 IEEE80211_NOTE(vap, 975 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 976 vap->iv_bss, 977 "HT bss occupancy change: %d sta, %d ht, " 978 "%d ht40%s, HT protmode now 0x%x" 979 , ic->ic_sta_assoc 980 , ic->ic_ht_sta_assoc 981 , ic->ic_ht40_sta_assoc 982 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ? 983 ", non-HT sta present" : "" 984 , ic->ic_curhtprotmode); 985 first = 0; 986 } 987 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 988 } 989} 990 991/* 992 * Calculate HT protection mode from current 993 * state and handle updates. 994 */ 995static void 996htinfo_update(struct ieee80211com *ic) 997{ 998 uint8_t protmode; 999 1000 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1001 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1002 | IEEE80211_HTINFO_NONHT_PRESENT; 1003 } else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) { 1004 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1005 | IEEE80211_HTINFO_NONHT_PRESENT; 1006 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1007 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1008 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1009 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1010 } else { 1011 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1012 } 1013 if (protmode != ic->ic_curhtprotmode) { 1014 ic->ic_curhtprotmode = protmode; 1015 htinfo_notify(ic); 1016 } 1017} 1018 1019/* 1020 * Handle an HT station joining a BSS. 1021 */ 1022void 1023ieee80211_ht_node_join(struct ieee80211_node *ni) 1024{ 1025 struct ieee80211com *ic = ni->ni_ic; 1026 1027 IEEE80211_LOCK_ASSERT(ic); 1028 1029 if (ni->ni_flags & IEEE80211_NODE_HT) { 1030 ic->ic_ht_sta_assoc++; 1031 if (ni->ni_chw == 40) 1032 ic->ic_ht40_sta_assoc++; 1033 } 1034 htinfo_update(ic); 1035} 1036 1037/* 1038 * Handle an HT station leaving a BSS. 1039 */ 1040void 1041ieee80211_ht_node_leave(struct ieee80211_node *ni) 1042{ 1043 struct ieee80211com *ic = ni->ni_ic; 1044 1045 IEEE80211_LOCK_ASSERT(ic); 1046 1047 if (ni->ni_flags & IEEE80211_NODE_HT) { 1048 ic->ic_ht_sta_assoc--; 1049 if (ni->ni_chw == 40) 1050 ic->ic_ht40_sta_assoc--; 1051 } 1052 htinfo_update(ic); 1053} 1054 1055/* 1056 * Public version of htinfo_update; used for processing 1057 * beacon frames from overlapping bss. 1058 * 1059 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1060 * (on receipt of a beacon that advertises MIXED) or 1061 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1062 * from an overlapping legacy bss). We treat MIXED with 1063 * a higher precedence than PROTOPT (i.e. we will not change 1064 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1065 * corresponds to how we handle things in htinfo_update. 1066 */ 1067void 1068ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1069{ 1070#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1071 if (protmode == ic->ic_curhtprotmode) 1072 return; 1073 if (OPMODE(ic->ic_curhtprotmode) == IEEE80211_HTINFO_OPMODE_MIXED && 1074 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT) 1075 return; 1076 1077 /* track non-HT station presence */ 1078 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1079 ("missing NONHT_PRESENT")); 1080 ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR; 1081 ic->ic_lastnonht = ticks; 1082 1083 /* push beacon update */ 1084 ic->ic_curhtprotmode = protmode; 1085 htinfo_notify(ic); 1086#undef OPMODE 1087} 1088 1089/* 1090 * Time out presence of an overlapping bss with non-HT 1091 * stations. When operating in hostap mode we listen for 1092 * beacons from other stations and if we identify a non-HT 1093 * station is present we update the opmode field of the 1094 * HTINFO ie. To identify when all non-HT stations are 1095 * gone we time out this condition. 1096 */ 1097void 1098ieee80211_ht_timeout(struct ieee80211com *ic) 1099{ 1100 IEEE80211_LOCK_ASSERT(ic); 1101 1102 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) && 1103 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1104#if 0 1105 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1106 "%s", "time out non-HT STA present on channel"); 1107#endif 1108 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 1109 htinfo_update(ic); 1110 } 1111} 1112 1113/* unalligned little endian access */ 1114#define LE_READ_2(p) \ 1115 ((uint16_t) \ 1116 ((((const uint8_t *)(p))[0] ) | \ 1117 (((const uint8_t *)(p))[1] << 8))) 1118 1119/* 1120 * Process an 802.11n HT capabilities ie. 1121 */ 1122void 1123ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1124{ 1125 struct ieee80211vap *vap = ni->ni_vap; 1126 1127 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1128 /* 1129 * Station used Vendor OUI ie to associate; 1130 * mark the node so when we respond we'll use 1131 * the Vendor OUI's and not the standard ie's. 1132 */ 1133 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1134 ie += 4; 1135 } else 1136 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1137 1138 ni->ni_htcap = LE_READ_2(ie + 1139 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1140 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1141 /* XXX needed or will ieee80211_parse_htinfo always be called? */ 1142 ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1143 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20; 1144} 1145 1146/* 1147 * Process an 802.11n HT info ie and update the node state. 1148 * Note that we handle use this information to identify the 1149 * correct channel (HT20, HT40+, HT40-, legacy). The caller 1150 * is responsible for insuring any required channel change is 1151 * done (e.g. in sta mode when parsing the contents of a 1152 * beacon frame). 1153 */ 1154void 1155ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1156{ 1157 struct ieee80211com *ic = ni->ni_ic; 1158 struct ieee80211vap *vap = ni->ni_vap; 1159 const struct ieee80211_ie_htinfo *htinfo; 1160 struct ieee80211_channel *c; 1161 uint16_t w; 1162 int htflags, chanflags; 1163 1164 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1165 ie += 4; 1166 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1167 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1168 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1169 w = LE_READ_2(&htinfo->hi_byte2); 1170 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1171 w = LE_READ_2(&htinfo->hi_byte45); 1172 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1173 /* 1174 * Handle 11n channel switch. Use the received HT ie's to 1175 * identify the right channel to use. If we cannot locate it 1176 * in the channel table then fallback to legacy operation. 1177 */ 1178 /* NB: honor operating mode constraint */ 1179 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1180 IEEE80211_CHAN_HT20 : 0; 1181 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1182 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1183 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1184 htflags = IEEE80211_CHAN_HT40U; 1185 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1186 htflags = IEEE80211_CHAN_HT40D; 1187 } 1188 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1189 if (chanflags != ni->ni_chan->ic_flags) { 1190 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1191 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1192 /* 1193 * No HT40 channel entry in our table; fall back 1194 * to HT20 operation. This should not happen. 1195 */ 1196 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1197 IEEE80211_NOTE(vap, 1198 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1199 "no HT40 channel (freq %u), falling back to HT20", 1200 ni->ni_chan->ic_freq); 1201 /* XXX stat */ 1202 } 1203 if (c != NULL && c != ni->ni_chan) { 1204 IEEE80211_NOTE(vap, 1205 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1206 "switch station to HT%d channel %u/0x%x", 1207 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1208 c->ic_freq, c->ic_flags); 1209 ni->ni_chan = c; 1210 } 1211 /* NB: caller responsible for forcing any channel change */ 1212 } 1213 /* update node's tx channel width */ 1214 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1215} 1216 1217/* 1218 * Install received HT rate set by parsing the HT cap ie. 1219 */ 1220int 1221ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1222{ 1223 struct ieee80211vap *vap = ni->ni_vap; 1224 const struct ieee80211_ie_htcap *htcap; 1225 struct ieee80211_htrateset *rs; 1226 int i; 1227 1228 rs = &ni->ni_htrates; 1229 memset(rs, 0, sizeof(*rs)); 1230 if (ie != NULL) { 1231 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1232 ie += 4; 1233 htcap = (const struct ieee80211_ie_htcap *) ie; 1234 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1235 if (isclr(htcap->hc_mcsset, i)) 1236 continue; 1237 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1238 IEEE80211_NOTE(vap, 1239 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1240 "WARNING, HT rate set too large; only " 1241 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1242 vap->iv_stats.is_rx_rstoobig++; 1243 break; 1244 } 1245 rs->rs_rates[rs->rs_nrates++] = i; 1246 } 1247 } 1248 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1249} 1250 1251/* 1252 * Mark rates in a node's HT rate set as basic according 1253 * to the information in the supplied HT info ie. 1254 */ 1255void 1256ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1257{ 1258 const struct ieee80211_ie_htinfo *htinfo; 1259 struct ieee80211_htrateset *rs; 1260 int i, j; 1261 1262 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1263 ie += 4; 1264 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1265 rs = &ni->ni_htrates; 1266 if (rs->rs_nrates == 0) { 1267 IEEE80211_NOTE(ni->ni_vap, 1268 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1269 "%s", "WARNING, empty HT rate set"); 1270 return; 1271 } 1272 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1273 if (isclr(htinfo->hi_basicmcsset, i)) 1274 continue; 1275 for (j = 0; j < rs->rs_nrates; j++) 1276 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1277 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1278 } 1279} 1280 1281static void 1282addba_timeout(void *arg) 1283{ 1284 struct ieee80211_tx_ampdu *tap = arg; 1285 1286 /* XXX ? */ 1287 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1288 tap->txa_attempts++; 1289} 1290 1291static void 1292addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1293{ 1294 /* XXX use CALLOUT_PENDING instead? */ 1295 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1296 addba_timeout, tap); 1297 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1298 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1299} 1300 1301static void 1302addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1303{ 1304 /* XXX use CALLOUT_PENDING instead? */ 1305 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1306 callout_stop(&tap->txa_timer); 1307 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1308 } 1309} 1310 1311/* 1312 * Default method for requesting A-MPDU tx aggregation. 1313 * We setup the specified state block and start a timer 1314 * to wait for an ADDBA response frame. 1315 */ 1316static int 1317ieee80211_addba_request(struct ieee80211_node *ni, 1318 struct ieee80211_tx_ampdu *tap, 1319 int dialogtoken, int baparamset, int batimeout) 1320{ 1321 int bufsiz; 1322 1323 /* XXX locking */ 1324 tap->txa_token = dialogtoken; 1325 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1326 tap->txa_start = tap->txa_seqstart = 0; 1327 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1328 tap->txa_wnd = (bufsiz == 0) ? 1329 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1330 addba_start_timeout(tap); 1331 return 1; 1332} 1333 1334/* 1335 * Default method for processing an A-MPDU tx aggregation 1336 * response. We shutdown any pending timer and update the 1337 * state block according to the reply. 1338 */ 1339static int 1340ieee80211_addba_response(struct ieee80211_node *ni, 1341 struct ieee80211_tx_ampdu *tap, 1342 int status, int baparamset, int batimeout) 1343{ 1344 int bufsiz; 1345 1346 /* XXX locking */ 1347 addba_stop_timeout(tap); 1348 if (status == IEEE80211_STATUS_SUCCESS) { 1349 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1350 /* XXX override our request? */ 1351 tap->txa_wnd = (bufsiz == 0) ? 1352 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1353 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1354 } else { 1355 /* mark tid so we don't try again */ 1356 tap->txa_flags |= IEEE80211_AGGR_NAK; 1357 } 1358 return 1; 1359} 1360 1361/* 1362 * Default method for stopping A-MPDU tx aggregation. 1363 * Any timer is cleared and we drain any pending frames. 1364 */ 1365static void 1366ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1367{ 1368 /* XXX locking */ 1369 addba_stop_timeout(tap); 1370 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1371 /* clear aggregation queue */ 1372 ieee80211_drain_ifq(&tap->txa_q); 1373 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1374 } 1375 tap->txa_attempts = 0; 1376} 1377 1378/* 1379 * Process a received action frame using the default aggregation 1380 * policy. We intercept ADDBA-related frames and use them to 1381 * update our aggregation state. All other frames are passed up 1382 * for processing by ieee80211_recv_action. 1383 */ 1384static void 1385ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1386 const uint8_t *frm, const uint8_t *efrm) 1387{ 1388 struct ieee80211com *ic = ni->ni_ic; 1389 struct ieee80211vap *vap = ni->ni_vap; 1390 const struct ieee80211_action *ia; 1391 struct ieee80211_rx_ampdu *rap; 1392 struct ieee80211_tx_ampdu *tap; 1393 uint8_t dialogtoken; 1394 uint16_t baparamset, batimeout, baseqctl, code; 1395 uint16_t args[4]; 1396 int tid, ac, bufsiz; 1397 1398 ia = (const struct ieee80211_action *) frm; 1399 switch (ia->ia_category) { 1400 case IEEE80211_ACTION_CAT_BA: 1401 switch (ia->ia_action) { 1402 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1403 dialogtoken = frm[2]; 1404 baparamset = LE_READ_2(frm+3); 1405 batimeout = LE_READ_2(frm+5); 1406 baseqctl = LE_READ_2(frm+7); 1407 1408 tid = MS(baparamset, IEEE80211_BAPS_TID); 1409 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1410 1411 IEEE80211_NOTE(vap, 1412 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1413 "recv ADDBA request: dialogtoken %u " 1414 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1415 "baseqctl %d:%d", 1416 dialogtoken, baparamset, tid, bufsiz, batimeout, 1417 MS(baseqctl, IEEE80211_BASEQ_START), 1418 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1419 1420 rap = &ni->ni_rx_ampdu[tid]; 1421 1422 /* Send ADDBA response */ 1423 args[0] = dialogtoken; 1424 /* 1425 * NB: We ack only if the sta associated with HT and 1426 * the ap is configured to do AMPDU rx (the latter 1427 * violates the 11n spec and is mostly for testing). 1428 */ 1429 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1430 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) { 1431 ampdu_rx_start(rap, bufsiz, 1432 MS(baseqctl, IEEE80211_BASEQ_START)); 1433 1434 args[1] = IEEE80211_STATUS_SUCCESS; 1435 } else { 1436 IEEE80211_NOTE(vap, 1437 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1438 ni, "reject ADDBA request: %s", 1439 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1440 "administratively disabled" : 1441 "not negotiated for station"); 1442 vap->iv_stats.is_addba_reject++; 1443 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1444 } 1445 /* XXX honor rap flags? */ 1446 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1447 | SM(tid, IEEE80211_BAPS_TID) 1448 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1449 ; 1450 args[3] = 0; 1451 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1452 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1453 return; 1454 1455 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1456 dialogtoken = frm[2]; 1457 code = LE_READ_2(frm+3); 1458 baparamset = LE_READ_2(frm+5); 1459 tid = MS(baparamset, IEEE80211_BAPS_TID); 1460 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1461 batimeout = LE_READ_2(frm+7); 1462 1463 ac = TID_TO_WME_AC(tid); 1464 tap = &ni->ni_tx_ampdu[ac]; 1465 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1466 IEEE80211_DISCARD_MAC(vap, 1467 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1468 ni->ni_macaddr, "ADDBA response", 1469 "no pending ADDBA, tid %d dialogtoken %u " 1470 "code %d", tid, dialogtoken, code); 1471 vap->iv_stats.is_addba_norequest++; 1472 return; 1473 } 1474 if (dialogtoken != tap->txa_token) { 1475 IEEE80211_DISCARD_MAC(vap, 1476 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1477 ni->ni_macaddr, "ADDBA response", 1478 "dialogtoken mismatch: waiting for %d, " 1479 "received %d, tid %d code %d", 1480 tap->txa_token, dialogtoken, tid, code); 1481 vap->iv_stats.is_addba_badtoken++; 1482 return; 1483 } 1484 1485 IEEE80211_NOTE(vap, 1486 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1487 "recv ADDBA response: dialogtoken %u code %d " 1488 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1489 dialogtoken, code, baparamset, tid, bufsiz, 1490 batimeout); 1491 ic->ic_addba_response(ni, tap, 1492 code, baparamset, batimeout); 1493 return; 1494 1495 case IEEE80211_ACTION_BA_DELBA: 1496 baparamset = LE_READ_2(frm+2); 1497 code = LE_READ_2(frm+4); 1498 1499 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1500 1501 IEEE80211_NOTE(vap, 1502 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1503 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1504 "code %d", baparamset, tid, 1505 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1506 1507 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1508 ac = TID_TO_WME_AC(tid); 1509 tap = &ni->ni_tx_ampdu[ac]; 1510 ic->ic_addba_stop(ni, tap); 1511 } else { 1512 rap = &ni->ni_rx_ampdu[tid]; 1513 ampdu_rx_stop(rap); 1514 } 1515 return; 1516 } 1517 break; 1518 } 1519 ieee80211_recv_action(ni, frm, efrm); 1520} 1521 1522/* 1523 * Process a received 802.11n action frame. 1524 * Aggregation-related frames are assumed to be handled 1525 * already; we handle any other frames we can, otherwise 1526 * complain about being unsupported (with debugging). 1527 */ 1528void 1529ieee80211_recv_action(struct ieee80211_node *ni, 1530 const uint8_t *frm, const uint8_t *efrm) 1531{ 1532 struct ieee80211vap *vap = ni->ni_vap; 1533 const struct ieee80211_action *ia; 1534 int chw; 1535 1536 ia = (const struct ieee80211_action *) frm; 1537 switch (ia->ia_category) { 1538 case IEEE80211_ACTION_CAT_BA: 1539 IEEE80211_NOTE(vap, 1540 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1541 "%s: BA action %d not implemented", __func__, 1542 ia->ia_action); 1543 vap->iv_stats.is_rx_mgtdiscard++; 1544 break; 1545 case IEEE80211_ACTION_CAT_HT: 1546 switch (ia->ia_action) { 1547 case IEEE80211_ACTION_HT_TXCHWIDTH: 1548 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1549 if (chw != ni->ni_chw) { 1550 ni->ni_chw = chw; 1551 ni->ni_flags |= IEEE80211_NODE_CHWUPDATE; 1552 } 1553 IEEE80211_NOTE(vap, 1554 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1555 "%s: HT txchwidth, width %d (%s)", 1556 __func__, chw, 1557 ni->ni_flags & IEEE80211_NODE_CHWUPDATE ? 1558 "new" : "no change"); 1559 break; 1560 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 1561 IEEE80211_NOTE(vap, 1562 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1563 "%s: HT MIMO PS", __func__); 1564 break; 1565 default: 1566 IEEE80211_NOTE(vap, 1567 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1568 "%s: HT action %d not implemented", __func__, 1569 ia->ia_action); 1570 vap->iv_stats.is_rx_mgtdiscard++; 1571 break; 1572 } 1573 break; 1574 default: 1575 IEEE80211_NOTE(vap, 1576 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1577 "%s: category %d not implemented", __func__, 1578 ia->ia_category); 1579 vap->iv_stats.is_rx_mgtdiscard++; 1580 break; 1581 } 1582} 1583 1584/* 1585 * Transmit processing. 1586 */ 1587 1588/* 1589 * Check if A-MPDU should be requested/enabled for a stream. 1590 * We require a traffic rate above a per-AC threshold and we 1591 * also handle backoff from previous failed attempts. 1592 * 1593 * Drivers may override this method to bring in information 1594 * such as link state conditions in making the decision. 1595 */ 1596static int 1597ieee80211_ampdu_enable(struct ieee80211_node *ni, 1598 struct ieee80211_tx_ampdu *tap) 1599{ 1600 struct ieee80211vap *vap = ni->ni_vap; 1601 1602 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1603 return 0; 1604 /* XXX check rssi? */ 1605 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1606 ticks < tap->txa_nextrequest) { 1607 /* 1608 * Don't retry too often; txa_nextrequest is set 1609 * to the minimum interval we'll retry after 1610 * ieee80211_addba_maxtries failed attempts are made. 1611 */ 1612 return 0; 1613 } 1614 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1615 "%s: enable AMPDU on %s, avgpps %d pkts %d", 1616 __func__, ieee80211_wme_acnames[tap->txa_ac], 1617 tap->txa_avgpps, tap->txa_pkts); 1618 return 1; 1619} 1620 1621/* 1622 * Request A-MPDU tx aggregation. Setup local state and 1623 * issue an ADDBA request. BA use will only happen after 1624 * the other end replies with ADDBA response. 1625 */ 1626int 1627ieee80211_ampdu_request(struct ieee80211_node *ni, 1628 struct ieee80211_tx_ampdu *tap) 1629{ 1630 struct ieee80211com *ic = ni->ni_ic; 1631 uint16_t args[4]; 1632 int tid, dialogtoken; 1633 static int tokens = 0; /* XXX */ 1634 1635 /* XXX locking */ 1636 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1637 /* do deferred setup of state */ 1638 IEEE80211_TAPQ_INIT(tap); 1639 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1640 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1641 } 1642 /* XXX hack for not doing proper locking */ 1643 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1644 1645 dialogtoken = (tokens+1) % 63; /* XXX */ 1646 1647 tid = WME_AC_TO_TID(tap->txa_ac); 1648 args[0] = dialogtoken; 1649 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1650 | SM(tid, IEEE80211_BAPS_TID) 1651 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1652 ; 1653 args[2] = 0; /* batimeout */ 1654 /* NB: do first so there's no race against reply */ 1655 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1656 /* unable to setup state, don't make request */ 1657 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1658 ni, "%s: could not setup BA stream for AC %d", 1659 __func__, tap->txa_ac); 1660 /* defer next try so we don't slam the driver with requests */ 1661 tap->txa_attempts = ieee80211_addba_maxtries; 1662 /* NB: check in case driver wants to override */ 1663 if (tap->txa_nextrequest <= ticks) 1664 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 1665 return 0; 1666 } 1667 tokens = dialogtoken; /* allocate token */ 1668 /* NB: after calling ic_addba_request so driver can set seqstart */ 1669 args[3] = SM(tap->txa_seqstart, IEEE80211_BASEQ_START) 1670 | SM(0, IEEE80211_BASEQ_FRAG) 1671 ; 1672 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1673 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1674} 1675 1676/* 1677 * Terminate an AMPDU tx stream. State is reclaimed 1678 * and the peer notified with a DelBA Action frame. 1679 */ 1680void 1681ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1682{ 1683 struct ieee80211com *ic = ni->ni_ic; 1684 struct ieee80211vap *vap = ni->ni_vap; 1685 uint16_t args[4]; 1686 1687 /* XXX locking */ 1688 if (IEEE80211_AMPDU_RUNNING(tap)) { 1689 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1690 ni, "%s: stop BA stream for AC %d", __func__, tap->txa_ac); 1691 vap->iv_stats.is_ampdu_stop++; 1692 1693 ic->ic_addba_stop(ni, tap); 1694 args[0] = WME_AC_TO_TID(tap->txa_ac); 1695 args[1] = IEEE80211_DELBAPS_INIT; 1696 args[2] = 1; /* XXX reason code */ 1697 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1698 IEEE80211_ACTION_BA_DELBA, args); 1699 } else { 1700 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1701 ni, "%s: BA stream for AC %d not running", 1702 __func__, tap->txa_ac); 1703 vap->iv_stats.is_ampdu_stop_failed++; 1704 } 1705} 1706 1707/* 1708 * Transmit a BAR frame to the specified node. The 1709 * BAR contents are drawn from the supplied aggregation 1710 * state associated with the node. 1711 */ 1712int 1713ieee80211_send_bar(struct ieee80211_node *ni, 1714 const struct ieee80211_tx_ampdu *tap) 1715{ 1716#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1717#define ADDSHORT(frm, v) do { \ 1718 frm[0] = (v) & 0xff; \ 1719 frm[1] = (v) >> 8; \ 1720 frm += 2; \ 1721} while (0) 1722 struct ieee80211vap *vap = ni->ni_vap; 1723 struct ieee80211com *ic = ni->ni_ic; 1724 struct ieee80211_frame_min *wh; 1725 struct mbuf *m; 1726 uint8_t *frm; 1727 uint16_t barctl, barseqctl; 1728 int tid, ret; 1729 1730 ieee80211_ref_node(ni); 1731 1732 m = ieee80211_getmgtframe(&frm, 1733 ic->ic_headroom + sizeof(struct ieee80211_frame_min), 1734 sizeof(struct ieee80211_ba_request) 1735 ); 1736 if (m == NULL) 1737 senderr(ENOMEM, is_tx_nobuf); 1738 1739 wh = mtod(m, struct ieee80211_frame_min *); 1740 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | 1741 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 1742 wh->i_fc[1] = 0; 1743 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1744 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1745 1746 tid = WME_AC_TO_TID(tap->txa_ac); 1747 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 1748 IEEE80211_BAPS_POLICY_IMMEDIATE : 1749 IEEE80211_BAPS_POLICY_DELAYED) 1750 | SM(tid, IEEE80211_BAPS_TID) 1751 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ) 1752 ; 1753 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START) 1754 | SM(0, IEEE80211_BASEQ_FRAG) 1755 ; 1756 ADDSHORT(frm, barctl); 1757 ADDSHORT(frm, barseqctl); 1758 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1759 1760 M_WME_SETAC(m, WME_AC_VO); 1761 1762 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 1763 1764 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1765 ni, "send bar frame (tid %u start %u) on channel %u", 1766 tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan)); 1767 1768 return ic->ic_raw_xmit(ni, m, NULL); 1769bad: 1770 ieee80211_free_node(ni); 1771 return ret; 1772#undef ADDSHORT 1773#undef senderr 1774} 1775 1776/* 1777 * Send an action management frame. The arguments are stuff 1778 * into a frame without inspection; the caller is assumed to 1779 * prepare them carefully (e.g. based on the aggregation state). 1780 */ 1781int 1782ieee80211_send_action(struct ieee80211_node *ni, 1783 int category, int action, uint16_t args[4]) 1784{ 1785#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1786#define ADDSHORT(frm, v) do { \ 1787 frm[0] = (v) & 0xff; \ 1788 frm[1] = (v) >> 8; \ 1789 frm += 2; \ 1790} while (0) 1791 struct ieee80211vap *vap = ni->ni_vap; 1792 struct ieee80211com *ic = ni->ni_ic; 1793 struct mbuf *m; 1794 uint8_t *frm; 1795 uint16_t baparamset; 1796 int ret; 1797 1798 KASSERT(ni != NULL, ("null node")); 1799 1800 /* 1801 * Hold a reference on the node so it doesn't go away until after 1802 * the xmit is complete all the way in the driver. On error we 1803 * will remove our reference. 1804 */ 1805 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1806 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1807 __func__, __LINE__, 1808 ni, ether_sprintf(ni->ni_macaddr), 1809 ieee80211_node_refcnt(ni)+1); 1810 ieee80211_ref_node(ni); 1811 1812 m = ieee80211_getmgtframe(&frm, 1813 ic->ic_headroom + sizeof(struct ieee80211_frame), 1814 sizeof(uint16_t) /* action+category */ 1815 /* XXX may action payload */ 1816 + sizeof(struct ieee80211_action_ba_addbaresponse) 1817 ); 1818 if (m == NULL) 1819 senderr(ENOMEM, is_tx_nobuf); 1820 1821 *frm++ = category; 1822 *frm++ = action; 1823 switch (category) { 1824 case IEEE80211_ACTION_CAT_BA: 1825 switch (action) { 1826 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1827 IEEE80211_NOTE(vap, 1828 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1829 "send ADDBA request: dialogtoken %d " 1830 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 1831 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 1832 args[2], args[3]); 1833 1834 *frm++ = args[0]; /* dialog token */ 1835 ADDSHORT(frm, args[1]); /* baparamset */ 1836 ADDSHORT(frm, args[2]); /* batimeout */ 1837 ADDSHORT(frm, args[3]); /* baseqctl */ 1838 break; 1839 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1840 IEEE80211_NOTE(vap, 1841 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1842 "send ADDBA response: dialogtoken %d status %d " 1843 "baparamset 0x%x (tid %d) batimeout %d", 1844 args[0], args[1], args[2], 1845 MS(args[2], IEEE80211_BAPS_TID), args[3]); 1846 1847 *frm++ = args[0]; /* dialog token */ 1848 ADDSHORT(frm, args[1]); /* statuscode */ 1849 ADDSHORT(frm, args[2]); /* baparamset */ 1850 ADDSHORT(frm, args[3]); /* batimeout */ 1851 break; 1852 case IEEE80211_ACTION_BA_DELBA: 1853 /* XXX */ 1854 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 1855 | SM(args[1], IEEE80211_DELBAPS_INIT) 1856 ; 1857 ADDSHORT(frm, baparamset); 1858 ADDSHORT(frm, args[2]); /* reason code */ 1859 1860 IEEE80211_NOTE(vap, 1861 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1862 "send DELBA action: tid %d, initiator %d reason %d", 1863 args[0], args[1], args[2]); 1864 break; 1865 default: 1866 goto badaction; 1867 } 1868 break; 1869 case IEEE80211_ACTION_CAT_HT: 1870 switch (action) { 1871 case IEEE80211_ACTION_HT_TXCHWIDTH: 1872 IEEE80211_NOTE(vap, 1873 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1874 ni, "send HT txchwidth: width %d", 1875 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20 1876 ); 1877 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 1878 IEEE80211_A_HT_TXCHWIDTH_2040 : 1879 IEEE80211_A_HT_TXCHWIDTH_20; 1880 break; 1881 default: 1882 goto badaction; 1883 } 1884 break; 1885 default: 1886 badaction: 1887 IEEE80211_NOTE(vap, 1888 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1889 "%s: unsupported category %d action %d", __func__, 1890 category, action); 1891 senderr(EINVAL, is_tx_unknownmgt); 1892 /* NOTREACHED */ 1893 } 1894 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1895 1896 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION); 1897bad: 1898 ieee80211_free_node(ni); 1899 if (m != NULL) 1900 m_freem(m); 1901 return ret; 1902#undef ADDSHORT 1903#undef senderr 1904} 1905 1906/* 1907 * Construct the MCS bit mask for inclusion 1908 * in an HT information element. 1909 */ 1910static void 1911ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1912{ 1913 int i; 1914 1915 for (i = 0; i < rs->rs_nrates; i++) { 1916 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1917 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 1918 /* NB: this assumes a particular implementation */ 1919 setbit(frm, r); 1920 } 1921 } 1922} 1923 1924/* 1925 * Add body of an HTCAP information element. 1926 */ 1927static uint8_t * 1928ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 1929{ 1930#define ADDSHORT(frm, v) do { \ 1931 frm[0] = (v) & 0xff; \ 1932 frm[1] = (v) >> 8; \ 1933 frm += 2; \ 1934} while (0) 1935 struct ieee80211vap *vap = ni->ni_vap; 1936 uint16_t caps; 1937 int rxmax, density; 1938 1939 /* HT capabilities */ 1940 caps = vap->iv_htcaps & 0xffff; 1941 /* 1942 * Note channel width depends on whether we are operating as 1943 * a sta or not. When operating as a sta we are generating 1944 * a request based on our desired configuration. Otherwise 1945 * we are operational and the channel attributes identify 1946 * how we've been setup (which might be different if a fixed 1947 * channel is specified). 1948 */ 1949 if (vap->iv_opmode == IEEE80211_M_STA) { 1950 /* override 20/40 use based on config */ 1951 if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) 1952 caps |= IEEE80211_HTCAP_CHWIDTH40; 1953 else 1954 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1955 /* use advertised setting (XXX locally constraint) */ 1956 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 1957 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 1958 } else { 1959 /* override 20/40 use based on current channel */ 1960 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 1961 caps |= IEEE80211_HTCAP_CHWIDTH40; 1962 else 1963 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1964 rxmax = vap->iv_ampdu_rxmax; 1965 density = vap->iv_ampdu_density; 1966 } 1967 /* adjust short GI based on channel and config */ 1968 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 1969 caps &= ~IEEE80211_HTCAP_SHORTGI20; 1970 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 1971 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 1972 caps &= ~IEEE80211_HTCAP_SHORTGI40; 1973 ADDSHORT(frm, caps); 1974 1975 /* HT parameters */ 1976 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 1977 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 1978 ; 1979 frm++; 1980 1981 /* pre-zero remainder of ie */ 1982 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 1983 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 1984 1985 /* supported MCS set */ 1986 /* 1987 * XXX it would better to get the rate set from ni_htrates 1988 * so we can restrict it but for sta mode ni_htrates isn't 1989 * setup when we're called to form an AssocReq frame so for 1990 * now we're restricted to the default HT rate set. 1991 */ 1992 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 1993 1994 frm += sizeof(struct ieee80211_ie_htcap) - 1995 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 1996 return frm; 1997#undef ADDSHORT 1998} 1999 2000/* 2001 * Add 802.11n HT capabilities information element 2002 */ 2003uint8_t * 2004ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2005{ 2006 frm[0] = IEEE80211_ELEMID_HTCAP; 2007 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2008 return ieee80211_add_htcap_body(frm + 2, ni); 2009} 2010 2011/* 2012 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2013 * used for compatibility w/ pre-draft implementations. 2014 */ 2015uint8_t * 2016ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2017{ 2018 frm[0] = IEEE80211_ELEMID_VENDOR; 2019 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2020 frm[2] = (BCM_OUI >> 0) & 0xff; 2021 frm[3] = (BCM_OUI >> 8) & 0xff; 2022 frm[4] = (BCM_OUI >> 16) & 0xff; 2023 frm[5] = BCM_OUI_HTCAP; 2024 return ieee80211_add_htcap_body(frm + 6, ni); 2025} 2026 2027/* 2028 * Construct the MCS bit mask of basic rates 2029 * for inclusion in an HT information element. 2030 */ 2031static void 2032ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2033{ 2034 int i; 2035 2036 for (i = 0; i < rs->rs_nrates; i++) { 2037 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2038 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2039 r < IEEE80211_HTRATE_MAXSIZE) { 2040 /* NB: this assumes a particular implementation */ 2041 setbit(frm, r); 2042 } 2043 } 2044} 2045 2046/* 2047 * Update the HTINFO ie for a beacon frame. 2048 */ 2049void 2050ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2051 struct ieee80211_beacon_offsets *bo) 2052{ 2053#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2054 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2055 struct ieee80211com *ic = vap->iv_ic; 2056 struct ieee80211_ie_htinfo *ht = 2057 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2058 2059 /* XXX only update on channel change */ 2060 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2061 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2062 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2063 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2064 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2065 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2066 else 2067 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2068 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2069 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2070 2071 /* protection mode */ 2072 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2073 2074 /* XXX propagate to vendor ie's */ 2075#undef PROTMODE 2076} 2077 2078/* 2079 * Add body of an HTINFO information element. 2080 * 2081 * NB: We don't use struct ieee80211_ie_htinfo because we can 2082 * be called to fillin both a standard ie and a compat ie that 2083 * has a vendor OUI at the front. 2084 */ 2085static uint8_t * 2086ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2087{ 2088 struct ieee80211com *ic = ni->ni_ic; 2089 2090 /* pre-zero remainder of ie */ 2091 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2092 2093 /* primary/control channel center */ 2094 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2095 2096 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2097 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2098 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2099 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2100 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2101 else 2102 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2103 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2104 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2105 2106 frm[1] = ic->ic_curhtprotmode; 2107 2108 frm += 5; 2109 2110 /* basic MCS set */ 2111 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2112 frm += sizeof(struct ieee80211_ie_htinfo) - 2113 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2114 return frm; 2115} 2116 2117/* 2118 * Add 802.11n HT information information element. 2119 */ 2120uint8_t * 2121ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2122{ 2123 frm[0] = IEEE80211_ELEMID_HTINFO; 2124 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2125 return ieee80211_add_htinfo_body(frm + 2, ni); 2126} 2127 2128/* 2129 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2130 * used for compatibility w/ pre-draft implementations. 2131 */ 2132uint8_t * 2133ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2134{ 2135 frm[0] = IEEE80211_ELEMID_VENDOR; 2136 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2137 frm[2] = (BCM_OUI >> 0) & 0xff; 2138 frm[3] = (BCM_OUI >> 8) & 0xff; 2139 frm[4] = (BCM_OUI >> 16) & 0xff; 2140 frm[5] = BCM_OUI_HTINFO; 2141 return ieee80211_add_htinfo_body(frm + 6, ni); 2142} 2143