ieee80211_ht.c revision 172226
1/*- 2 * Copyright (c) 2007 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 172226 2007-09-18 20:46:36Z sam $"); 29#endif 30 31/* 32 * IEEE 802.11n protocol support. 33 */ 34 35#include "opt_inet.h" 36 37#include <sys/param.h> 38#include <sys/kernel.h> 39#include <sys/systm.h> 40#include <sys/endian.h> 41 42#include <sys/socket.h> 43 44#include <net/if.h> 45#include <net/if_media.h> 46#include <net/ethernet.h> 47 48#include <net80211/ieee80211_var.h> 49 50/* define here, used throughout file */ 51#define MS(_v, _f) (((_v) & _f) >> _f##_S) 52#define SM(_v, _f) (((_v) << _f##_S) & _f) 53 54/* XXX need max array size */ 55const int ieee80211_htrates[16] = { 56 13, /* IFM_IEEE80211_MCS0 */ 57 26, /* IFM_IEEE80211_MCS1 */ 58 39, /* IFM_IEEE80211_MCS2 */ 59 52, /* IFM_IEEE80211_MCS3 */ 60 78, /* IFM_IEEE80211_MCS4 */ 61 104, /* IFM_IEEE80211_MCS5 */ 62 117, /* IFM_IEEE80211_MCS6 */ 63 130, /* IFM_IEEE80211_MCS7 */ 64 26, /* IFM_IEEE80211_MCS8 */ 65 52, /* IFM_IEEE80211_MCS9 */ 66 78, /* IFM_IEEE80211_MCS10 */ 67 104, /* IFM_IEEE80211_MCS11 */ 68 156, /* IFM_IEEE80211_MCS12 */ 69 208, /* IFM_IEEE80211_MCS13 */ 70 234, /* IFM_IEEE80211_MCS14 */ 71 260, /* IFM_IEEE80211_MCS15 */ 72}; 73 74static const struct ieee80211_htrateset ieee80211_rateset_11n = 75 { 16, { 76 /* MCS: 6.5 13 19.5 26 39 52 58.5 65 13 26 */ 77 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 78 /* 39 52 78 104 117, 130 */ 79 10, 11, 12, 13, 14, 15 } 80 }; 81 82#define IEEE80211_AGGR_TIMEOUT msecs_to_ticks(250) 83#define IEEE80211_AGGR_MINRETRY msecs_to_ticks(10*1000) 84#define IEEE80211_AGGR_MAXTRIES 3 85 86static int ieee80211_addba_request(struct ieee80211_node *ni, 87 struct ieee80211_tx_ampdu *tap, 88 int dialogtoken, int baparamset, int batimeout); 89static int ieee80211_addba_response(struct ieee80211_node *ni, 90 struct ieee80211_tx_ampdu *tap, 91 int code, int baparamset, int batimeout); 92static void ieee80211_addba_stop(struct ieee80211_node *ni, 93 struct ieee80211_tx_ampdu *tap); 94static void ieee80211_aggr_recv_action(struct ieee80211_node *ni, 95 const uint8_t *frm, const uint8_t *efrm); 96 97void 98ieee80211_ht_attach(struct ieee80211com *ic) 99{ 100 101 ic->ic_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 102 ic->ic_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 103 ic->ic_ampdu_limit = ic->ic_ampdu_rxmax; 104 105 ic->ic_amsdu_limit = IEEE80211_HTCAP_MAXAMSDU_3839; 106 107 /* setup default aggregation policy */ 108 ic->ic_recv_action = ieee80211_aggr_recv_action; 109 ic->ic_send_action = ieee80211_send_action; 110 ic->ic_addba_request = ieee80211_addba_request; 111 ic->ic_addba_response = ieee80211_addba_response; 112 ic->ic_addba_stop = ieee80211_addba_stop; 113 114 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) || 115 isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) { 116 /* 117 * There are HT channels in the channel list; enable 118 * all HT-related facilities by default. 119 * XXX these choices may be too aggressive. 120 */ 121 ic->ic_flags_ext |= IEEE80211_FEXT_HT 122 | IEEE80211_FEXT_HTCOMPAT 123 ; 124 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) 125 ic->ic_flags_ext |= IEEE80211_FEXT_SHORTGI20; 126 /* XXX infer from channel list */ 127 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 128 ic->ic_flags_ext |= IEEE80211_FEXT_USEHT40; 129 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40) 130 ic->ic_flags_ext |= IEEE80211_FEXT_SHORTGI40; 131 } 132 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 133 ic->ic_flags_ext |= IEEE80211_FEXT_AMPDU_RX; 134 if (ic->ic_htcaps & IEEE80211_HTC_AMPDU) 135 ic->ic_flags_ext |= IEEE80211_FEXT_AMPDU_TX; 136 ic->ic_flags_ext |= IEEE80211_FEXT_AMSDU_RX; 137 if (ic->ic_htcaps & IEEE80211_HTC_AMSDU) 138 ic->ic_flags_ext |= IEEE80211_FEXT_AMSDU_TX; 139 140 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 141 } 142} 143 144void 145ieee80211_ht_detach(struct ieee80211com *ic) 146{ 147} 148 149static void 150ht_announce(struct ieee80211com *ic, int mode, 151 const struct ieee80211_htrateset *rs) 152{ 153 struct ifnet *ifp = ic->ic_ifp; 154 int i, rate, mword; 155 156 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]); 157 for (i = 0; i < rs->rs_nrates; i++) { 158 mword = ieee80211_rate2media(ic, 159 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode); 160 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 161 continue; 162 rate = ieee80211_htrates[rs->rs_rates[i]]; 163 printf("%s%d%sMbps", (i != 0 ? " " : ""), 164 rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); 165 } 166 printf("\n"); 167} 168 169void 170ieee80211_ht_announce(struct ieee80211com *ic) 171{ 172 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 173 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n); 174 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 175 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n); 176} 177 178const struct ieee80211_htrateset * 179ieee80211_get_suphtrates(struct ieee80211com *ic, 180 const struct ieee80211_channel *c) 181{ 182 if (IEEE80211_IS_CHAN_HT(c)) 183 return &ieee80211_rateset_11n; 184 /* XXX what's the right thing to do here? */ 185 return (const struct ieee80211_htrateset *) 186 ieee80211_get_suprates(ic, c); 187} 188 189/* 190 * Receive processing. 191 */ 192 193/* 194 * Decap the encapsulated A-MSDU frames and dispatch all but 195 * the last for delivery. The last frame is returned for 196 * delivery via the normal path. 197 */ 198struct mbuf * 199ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 200{ 201 struct ieee80211com *ic = ni->ni_ic; 202 int totallen, framelen; 203 struct mbuf *n; 204 205 /* discard 802.3 header inserted by ieee80211_decap */ 206 m_adj(m, sizeof(struct ether_header)); 207 208 ic->ic_stats.is_amsdu_decap++; 209 210 totallen = m->m_pkthdr.len; 211 for (;;) { 212 /* 213 * Decap the first frame, bust it apart from the 214 * remainder and deliver. We leave the last frame 215 * delivery to the caller (for consistency with other 216 * code paths, could also do it here). 217 */ 218 m = ieee80211_decap1(m, &framelen); 219 if (m == NULL) { 220 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 221 ni->ni_macaddr, "a-msdu", "%s", "first decap failed"); 222 ic->ic_stats.is_amsdu_tooshort++; 223 return NULL; 224 } 225 if (framelen == totallen) 226 break; 227 n = m_split(m, framelen, M_NOWAIT); 228 if (n == NULL) { 229 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 230 ni->ni_macaddr, "a-msdu", 231 "%s", "unable to split encapsulated frames"); 232 ic->ic_stats.is_amsdu_split++; 233 m_freem(m); /* NB: must reclaim */ 234 return NULL; 235 } 236 ieee80211_deliver_data(ic, ni, m); 237 238 /* 239 * Remove frame contents; each intermediate frame 240 * is required to be aligned to a 4-byte boundary. 241 */ 242 m = n; 243 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 244 } 245 return m; /* last delivered by caller */ 246} 247 248/* 249 * Start A-MPDU rx/re-order processing for the specified TID. 250 */ 251static void 252ampdu_rx_start(struct ieee80211_rx_ampdu *rap, int bufsiz, int start) 253{ 254 memset(rap, 0, sizeof(*rap)); 255 rap->rxa_wnd = (bufsiz == 0) ? 256 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 257 rap->rxa_start = start; 258 rap->rxa_nxt = rap->rxa_start; 259 rap->rxa_flags |= IEEE80211_AGGR_XCHGPEND; 260} 261 262/* 263 * Purge all frames in the A-MPDU re-order queue. 264 */ 265static void 266ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 267{ 268 struct mbuf *m; 269 int i; 270 271 for (i = 0; i < rap->rxa_wnd; i++) { 272 m = rap->rxa_m[i]; 273 if (m != NULL) { 274 rap->rxa_m[i] = NULL; 275 rap->rxa_qbytes -= m->m_pkthdr.len; 276 m_freem(m); 277 if (--rap->rxa_qframes == 0) 278 break; 279 } 280 } 281 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 282 ("lost %u data, %u frames on ampdu rx q", 283 rap->rxa_qbytes, rap->rxa_qframes)); 284} 285 286/* 287 * Stop A-MPDU rx processing for the specified TID. 288 */ 289static void 290ampdu_rx_stop(struct ieee80211_rx_ampdu *rap) 291{ 292 rap->rxa_flags &= ~IEEE80211_AGGR_XCHGPEND; 293 ampdu_rx_purge(rap); 294} 295 296/* 297 * Dispatch a frame from the A-MPDU reorder queue. The 298 * frame is fed back into ieee80211_input marked with an 299 * M_AMPDU flag so it doesn't come back to us (it also 300 * permits ieee80211_input to optimize re-processing). 301 */ 302static __inline void 303ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 304{ 305 m->m_flags |= M_AMPDU; /* bypass normal processing */ 306 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU set */ 307 (void) ieee80211_input(ni->ni_ic, m, ni, 0, 0, 0); 308} 309 310/* 311 * Dispatch as many frames as possible from the re-order queue. 312 * Frames will always be "at the front"; we process all frames 313 * up to the first empty slot in the window. On completion we 314 * cleanup state if there are still pending frames in the current 315 * BA window. We assume the frame at slot 0 is already handled 316 * by the caller; we always start at slot 1. 317 */ 318static void 319ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 320{ 321 struct ieee80211com *ic = ni->ni_ic; 322 struct mbuf *m; 323 int i; 324 325 /* flush run of frames */ 326 for (i = 1; i < rap->rxa_wnd; i++) { 327 m = rap->rxa_m[i]; 328 if (m == NULL) 329 break; 330 rap->rxa_m[i] = NULL; 331 rap->rxa_qbytes -= m->m_pkthdr.len; 332 rap->rxa_qframes--; 333 334 ampdu_dispatch(ni, m); 335 } 336 /* 337 * Adjust the start of the BA window to 338 * reflect the frames just dispatched. 339 */ 340 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 341 rap->rxa_nxt = rap->rxa_start; 342 ic->ic_stats.is_ampdu_rx_oor += i; 343 /* 344 * If frames remain, copy the mbuf pointers down so 345 * they correspond to the offsets in the new window. 346 */ 347 if (rap->rxa_qframes != 0) { 348 int n = rap->rxa_qframes, j; 349 for (j = i+1; j < rap->rxa_wnd; j++) { 350 if (rap->rxa_m[j] != NULL) { 351 rap->rxa_m[j-i] = rap->rxa_m[j]; 352 rap->rxa_m[j] = NULL; 353 if (--n == 0) 354 break; 355 } 356 } 357 KASSERT(n == 0, ("lost %d frames", n)); 358 ic->ic_stats.is_ampdu_rx_copy += rap->rxa_qframes; 359 } 360} 361 362/* 363 * Dispatch all frames in the A-MPDU 364 * re-order queue up to the specified slot. 365 */ 366static void 367ampdu_rx_flush(struct ieee80211_node *ni, 368 struct ieee80211_rx_ampdu *rap, int limit) 369{ 370 struct mbuf *m; 371 int i; 372 373 for (i = 0; i < limit; i++) { 374 m = rap->rxa_m[i]; 375 if (m == NULL) 376 continue; 377 rap->rxa_m[i] = NULL; 378 rap->rxa_qbytes -= m->m_pkthdr.len; 379 ampdu_dispatch(ni, m); 380 if (--rap->rxa_qframes == 0) 381 break; 382 } 383} 384 385/* 386 * Process a received QoS data frame for an HT station. Handle 387 * A-MPDU reordering: if this frame is received out of order 388 * and falls within the BA window hold onto it. Otherwise if 389 * this frame completes a run flush any pending frames. We 390 * return 1 if the frame is consumed. A 0 is returned if 391 * the frame should be processed normally by the caller. 392 */ 393int 394ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 395{ 396#define IEEE80211_FC0_QOSDATA \ 397 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 398 struct ieee80211com *ic = ni->ni_ic; 399 struct ieee80211_qosframe *wh; 400 struct ieee80211_rx_ampdu *rap; 401 ieee80211_seq rxseq; 402 uint8_t tid; 403 int off; 404 405 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 406 407 /* NB: m_len known to be sufficient */ 408 wh = mtod(m, struct ieee80211_qosframe *); 409 KASSERT(wh->i_fc[0] == IEEE80211_FC0_QOSDATA, ("not QoS data")); 410 411 /* XXX 4-address frame */ 412 tid = wh->i_qos[0] & IEEE80211_QOS_TID; 413 rap = &ni->ni_rx_ampdu[tid]; 414 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 415 /* 416 * No ADDBA request yet, don't touch. 417 */ 418 return 0; 419 } 420 rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 421 if (rxseq == rap->rxa_start) { 422 /* 423 * First frame in window. 424 */ 425 if (rap->rxa_qframes != 0) { 426 /* 427 * Dispatch as many packets as we can. 428 */ 429 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 430 ampdu_dispatch(ni, m); 431 ampdu_rx_dispatch(rap, ni); 432 return 1; /* NB: consumed */ 433 } else { 434 /* 435 * In order; advance window and notify 436 * caller to dispatch directly. 437 */ 438 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 439 rap->rxa_nxt = rap->rxa_start; 440 return 0; /* NB: process packet */ 441 } 442 } 443 /* 444 * This packet is out of order; store it 445 * if it's in the BA window. 446 */ 447 /* calculate offset in BA window */ 448 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 449 if (off >= rap->rxa_wnd) { 450 /* 451 * Outside the window, clear the q and start over. 452 * 453 * NB: this handles the case where rxseq is before 454 * rxa_start because our max BA window is 64 455 * and the sequence number range is 4096. 456 */ 457 IEEE80211_NOTE(ic, IEEE80211_MSG_11N, ni, 458 "flush BA win <%u:%u> (%u frames) rxseq %u tid %u", 459 rap->rxa_start, 460 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd), 461 rap->rxa_qframes, rxseq, tid); 462 463 if (rap->rxa_qframes != 0) { 464 ic->ic_stats.is_ampdu_rx_oor += rap->rxa_qframes; 465 ampdu_rx_flush(ni, rap, rap->rxa_wnd); 466 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 467 ("lost %u data, %u frames on ampdu rx q", 468 rap->rxa_qbytes, rap->rxa_qframes)); 469 } 470 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 471 rap->rxa_nxt = rap->rxa_start; 472 return 0; /* NB: process packet */ 473 } 474 if (rap->rxa_qframes != 0) { 475#if 0 476 /* XXX honor batimeout? */ 477 if (ticks - mn->mn_age[tid] > 50) { 478 /* 479 * Too long since we received the first frame; flush. 480 */ 481 if (rap->rxa_qframes != 0) { 482 ic->ic_stats.is_ampdu_rx_oor += 483 rap->rxa_qframes; 484 ampdu_rx_flush(ni, rap, rap->rxa_wnd); 485 } 486 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 487 rap->rxa_nxt = rap->rxa_start; 488 return 0; /* NB: process packet */ 489 } 490#endif 491 rap->rxa_nxt = rxseq; 492 } else { 493 /* 494 * First frame, start aging timer. 495 */ 496#if 0 497 mn->mn_age[tid] = ticks; 498#endif 499 } 500 /* save packet */ 501 if (rap->rxa_m[off] == NULL) { 502 rap->rxa_m[off] = m; 503 rap->rxa_qframes++; 504 rap->rxa_qbytes += m->m_pkthdr.len; 505 } else { 506 IEEE80211_DISCARD_MAC(ic, 507 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 508 ni->ni_macaddr, "a-mpdu duplicate", 509 "seqno %u tid %u BA win <%u:%u>", 510 rxseq, tid, rap->rxa_start, rap->rxa_wnd); 511 ic->ic_stats.is_rx_dup++; 512 IEEE80211_NODE_STAT(ni, rx_dup); 513 m_freem(m); 514 } 515 return 1; /* NB: consumed */ 516#undef IEEE80211_FC0_QOSDATA 517} 518 519/* 520 * Process a BAR ctl frame. Dispatch all frames up to 521 * the sequence number of the frame. If this frame is 522 * out of the window it's discarded. 523 */ 524void 525ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 526{ 527 struct ieee80211com *ic = ni->ni_ic; 528 struct ieee80211_frame_bar *wh; 529 struct ieee80211_rx_ampdu *rap; 530 ieee80211_seq rxseq; 531 int tid, off; 532 533 wh = mtod(m0, struct ieee80211_frame_bar *); 534 /* XXX check basic BAR */ 535 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 536 rap = &ni->ni_rx_ampdu[tid]; 537 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 538 /* 539 * No ADDBA request yet, don't touch. 540 */ 541 IEEE80211_DISCARD_MAC(ic, 542 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 543 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 544 ic->ic_stats.is_ampdu_bar_bad++; 545 return; 546 } 547 ic->ic_stats.is_ampdu_bar_rx++; 548 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 549 /* calculate offset in BA window */ 550 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 551 if (off >= rap->rxa_wnd) { 552 /* 553 * Outside the window, flush the reorder q if 554 * not pulling the sequence # backward. The 555 * latter is typically caused by a dropped BA. 556 */ 557 IEEE80211_NOTE(ic, IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni, 558 "recv BAR outside BA win <%u:%u> rxseq %u tid %u", 559 rap->rxa_start, 560 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd), 561 rxseq, tid); 562 ic->ic_stats.is_ampdu_bar_oow++; 563 if (rxseq < rap->rxa_start) { 564 /* XXX stat? */ 565 return; 566 } 567 if (rap->rxa_qframes != 0) { 568 ic->ic_stats.is_ampdu_rx_oor += rap->rxa_qframes; 569 ampdu_rx_flush(ni, rap, rap->rxa_wnd); 570 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 571 ("lost %u data, %u frames on ampdu rx q", 572 rap->rxa_qbytes, rap->rxa_qframes)); 573 } 574 } else if (rap->rxa_qframes != 0) { 575 /* 576 * Dispatch packets up to rxseq. 577 */ 578 ampdu_rx_flush(ni, rap, off); 579 ic->ic_stats.is_ampdu_rx_oor += off; 580 581 /* 582 * If frames remain, copy the mbuf pointers down so 583 * they correspond to the offsets in the new window. 584 */ 585 if (rap->rxa_qframes != 0) { 586 int n = rap->rxa_qframes, j; 587 for (j = off+1; j < rap->rxa_wnd; j++) { 588 if (rap->rxa_m[j] != NULL) { 589 rap->rxa_m[j-off] = rap->rxa_m[j]; 590 rap->rxa_m[j] = NULL; 591 if (--n == 0) 592 break; 593 } 594 } 595 KASSERT(n == 0, ("lost %d frames", n)); 596 ic->ic_stats.is_ampdu_rx_copy += rap->rxa_qframes; 597 } 598 } 599 rap->rxa_start = rxseq; 600 rap->rxa_nxt = rap->rxa_start; 601} 602 603/* 604 * Setup HT-specific state in a node. Called only 605 * when HT use is negotiated so we don't do extra 606 * work for temporary and/or legacy sta's. 607 */ 608void 609ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap) 610{ 611 struct ieee80211_tx_ampdu *tap; 612 int ac; 613 614 ieee80211_parse_htcap(ni, htcap); 615 for (ac = 0; ac < WME_NUM_AC; ac++) { 616 tap = &ni->ni_tx_ampdu[ac]; 617 tap->txa_ac = ac; 618 } 619 ni->ni_flags |= IEEE80211_NODE_HT; 620} 621 622/* 623 * Cleanup HT-specific state in a node. Called only 624 * when HT use has been marked. 625 */ 626void 627ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 628{ 629 struct ieee80211com *ic = ni->ni_ic; 630 int i; 631 632 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 633 634 /* XXX optimize this */ 635 for (i = 0; i < WME_NUM_AC; i++) { 636 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 637 if (IEEE80211_AMPDU_REQUESTED(tap)) 638 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]); 639 } 640 for (i = 0; i < WME_NUM_TID; i++) 641 ampdu_rx_stop(&ni->ni_rx_ampdu[i]); 642 643 ni->ni_htcap = 0; 644 ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT); 645} 646 647/* unalligned little endian access */ 648#define LE_READ_2(p) \ 649 ((uint16_t) \ 650 ((((const uint8_t *)(p))[0] ) | \ 651 (((const uint8_t *)(p))[1] << 8))) 652 653/* 654 * Process an 802.11n HT capabilities ie. 655 */ 656void 657ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 658{ 659 struct ieee80211com *ic = ni->ni_ic; 660 661 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 662 /* 663 * Station used Vendor OUI ie to associate; 664 * mark the node so when we respond we'll use 665 * the Vendor OUI's and not the standard ie's. 666 */ 667 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 668 ie += 4; 669 } else 670 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 671 672 ni->ni_htcap = LE_READ_2(ie + 673 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 674 if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0) 675 ni->ni_htcap &= ~IEEE80211_HTCAP_SHORTGI40; 676 if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 677 ni->ni_htcap &= ~IEEE80211_HTCAP_SHORTGI20; 678 ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) ? 40 : 20; 679 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 680#if 0 681 ni->ni_maxampdu = 682 (8*1024) << MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 683 ni->ni_mpdudensity = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 684#endif 685} 686 687/* 688 * Process an 802.11n HT info ie. 689 */ 690void 691ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 692{ 693 const struct ieee80211_ie_htinfo *htinfo; 694 uint16_t w; 695 int chw; 696 697 if (ie[0] == IEEE80211_ELEMID_VENDOR) 698 ie += 4; 699 htinfo = (const struct ieee80211_ie_htinfo *) ie; 700 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 701 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 702 w = LE_READ_2(&htinfo->hi_byte2); 703 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 704 w = LE_READ_2(&htinfo->hi_byte45); 705 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 706 /* update node's recommended tx channel width */ 707 chw = (htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) ? 40 : 20; 708 if (chw != ni->ni_chw) { 709 ni->ni_chw = chw; 710 ni->ni_flags |= IEEE80211_NODE_CHWUPDATE; 711 } 712} 713 714/* 715 * Install received HT rate set by parsing the HT cap ie. 716 */ 717int 718ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 719{ 720 struct ieee80211com *ic = ni->ni_ic; 721 const struct ieee80211_ie_htcap *htcap; 722 struct ieee80211_htrateset *rs; 723 int i; 724 725 rs = &ni->ni_htrates; 726 memset(rs, 0, sizeof(*rs)); 727 if (ie != NULL) { 728 if (ie[0] == IEEE80211_ELEMID_VENDOR) 729 ie += 4; 730 htcap = (const struct ieee80211_ie_htcap *) ie; 731 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 732 if (isclr(htcap->hc_mcsset, i)) 733 continue; 734 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 735 IEEE80211_NOTE(ic, 736 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 737 "WARNING, HT rate set too large; only " 738 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 739 ic->ic_stats.is_rx_rstoobig++; 740 break; 741 } 742 rs->rs_rates[rs->rs_nrates++] = i; 743 } 744 } 745 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 746} 747 748/* 749 * Mark rates in a node's HT rate set as basic according 750 * to the information in the supplied HT info ie. 751 */ 752void 753ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 754{ 755 const struct ieee80211_ie_htinfo *htinfo; 756 struct ieee80211_htrateset *rs; 757 int i, j; 758 759 if (ie[0] == IEEE80211_ELEMID_VENDOR) 760 ie += 4; 761 htinfo = (const struct ieee80211_ie_htinfo *) ie; 762 rs = &ni->ni_htrates; 763 if (rs->rs_nrates == 0) { 764 IEEE80211_NOTE(ni->ni_ic, 765 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 766 "%s", "WARNING, empty HT rate set"); 767 return; 768 } 769 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 770 if (isclr(htinfo->hi_basicmcsset, i)) 771 continue; 772 for (j = 0; j < rs->rs_nrates; j++) 773 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 774 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 775 } 776} 777 778static void 779addba_timeout(void *arg) 780{ 781 struct ieee80211_tx_ampdu *tap = arg; 782 783 /* XXX ? */ 784 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 785 tap->txa_attempts++; 786} 787 788static void 789addba_start_timeout(struct ieee80211_tx_ampdu *tap) 790{ 791 /* XXX use CALLOUT_PENDING instead? */ 792 callout_reset(&tap->txa_timer, IEEE80211_AGGR_TIMEOUT, 793 addba_timeout, tap); 794 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 795 tap->txa_lastrequest = ticks; 796} 797 798static void 799addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 800{ 801 /* XXX use CALLOUT_PENDING instead? */ 802 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 803 callout_stop(&tap->txa_timer); 804 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 805 } 806} 807 808/* 809 * Default method for requesting A-MPDU tx aggregation. 810 * We setup the specified state block and start a timer 811 * to wait for an ADDBA response frame. 812 */ 813static int 814ieee80211_addba_request(struct ieee80211_node *ni, 815 struct ieee80211_tx_ampdu *tap, 816 int dialogtoken, int baparamset, int batimeout) 817{ 818 int bufsiz; 819 820 /* XXX locking */ 821 tap->txa_token = dialogtoken; 822 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 823 tap->txa_start = tap->txa_seqstart = 0; 824 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 825 tap->txa_wnd = (bufsiz == 0) ? 826 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 827 addba_start_timeout(tap); 828 return 1; 829} 830 831/* 832 * Default method for processing an A-MPDU tx aggregation 833 * response. We shutdown any pending timer and update the 834 * state block according to the reply. 835 */ 836static int 837ieee80211_addba_response(struct ieee80211_node *ni, 838 struct ieee80211_tx_ampdu *tap, 839 int status, int baparamset, int batimeout) 840{ 841 int bufsiz; 842 843 /* XXX locking */ 844 addba_stop_timeout(tap); 845 if (status == IEEE80211_STATUS_SUCCESS) { 846 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 847 /* XXX override our request? */ 848 tap->txa_wnd = (bufsiz == 0) ? 849 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 850 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 851 } 852 return 1; 853} 854 855/* 856 * Default method for stopping A-MPDU tx aggregation. 857 * Any timer is cleared and we drain any pending frames. 858 */ 859static void 860ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 861{ 862 /* XXX locking */ 863 addba_stop_timeout(tap); 864 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 865 /* clear aggregation queue */ 866 ieee80211_drain_ifq(&tap->txa_q); 867 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 868 } 869 tap->txa_attempts = 0; 870} 871 872/* 873 * Process a received action frame using the default aggregation 874 * policy. We intercept ADDBA-related frames and use them to 875 * update our aggregation state. All other frames are passed up 876 * for processing by ieee80211_recv_action. 877 */ 878static void 879ieee80211_aggr_recv_action(struct ieee80211_node *ni, 880 const uint8_t *frm, const uint8_t *efrm) 881{ 882 struct ieee80211com *ic = ni->ni_ic; 883 const struct ieee80211_action *ia; 884 struct ieee80211_rx_ampdu *rap; 885 struct ieee80211_tx_ampdu *tap; 886 uint8_t dialogtoken; 887 uint16_t baparamset, batimeout, baseqctl, code; 888 uint16_t args[4]; 889 int tid, ac, bufsiz; 890 891 ia = (const struct ieee80211_action *) frm; 892 switch (ia->ia_category) { 893 case IEEE80211_ACTION_CAT_BA: 894 switch (ia->ia_action) { 895 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 896 dialogtoken = frm[2]; 897 baparamset = LE_READ_2(frm+3); 898 batimeout = LE_READ_2(frm+5); 899 baseqctl = LE_READ_2(frm+7); 900 901 tid = MS(baparamset, IEEE80211_BAPS_TID); 902 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 903 904 IEEE80211_NOTE(ic, 905 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 906 "recv ADDBA request: dialogtoken %u " 907 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 908 "baseqctl %d", 909 dialogtoken, baparamset, tid, bufsiz, 910 batimeout, baseqctl); 911 912 rap = &ni->ni_rx_ampdu[tid]; 913 914 /* Send ADDBA response */ 915 args[0] = dialogtoken; 916 if (ic->ic_flags_ext & IEEE80211_FEXT_AMPDU_RX) { 917 ampdu_rx_start(rap, bufsiz, 918 MS(baseqctl, IEEE80211_BASEQ_START)); 919 920 args[1] = IEEE80211_STATUS_SUCCESS; 921 } else 922 args[1] = IEEE80211_STATUS_UNSPECIFIED; 923 /* XXX honor rap flags? */ 924 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 925 | SM(tid, IEEE80211_BAPS_TID) 926 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 927 ; 928 args[3] = 0; 929 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 930 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 931 return; 932 933 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 934 dialogtoken = frm[2]; 935 code = LE_READ_2(frm+3); 936 baparamset = LE_READ_2(frm+5); 937 tid = MS(baparamset, IEEE80211_BAPS_TID); 938 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 939 batimeout = LE_READ_2(frm+7); 940 941 IEEE80211_NOTE(ic, 942 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 943 "recv ADDBA response: dialogtoken %u code %d " 944 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 945 dialogtoken, code, baparamset, tid, bufsiz, 946 batimeout); 947 948 ac = TID_TO_WME_AC(tid); 949 tap = &ni->ni_tx_ampdu[ac]; 950 951 ic->ic_addba_response(ni, tap, 952 code, baparamset, batimeout); 953 return; 954 955 case IEEE80211_ACTION_BA_DELBA: 956 baparamset = LE_READ_2(frm+2); 957 code = LE_READ_2(frm+4); 958 959 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 960 961 IEEE80211_NOTE(ic, 962 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 963 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 964 "code %d", baparamset, tid, 965 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 966 967 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 968 ac = TID_TO_WME_AC(tid); 969 tap = &ni->ni_tx_ampdu[ac]; 970 ic->ic_addba_stop(ni, tap); 971 } else { 972 rap = &ni->ni_rx_ampdu[tid]; 973 ampdu_rx_stop(rap); 974 } 975 return; 976 } 977 break; 978 } 979 return ieee80211_recv_action(ni, frm, efrm); 980} 981 982/* 983 * Process a received 802.11n action frame. 984 * Aggregation-related frames are assumed to be handled 985 * already; we handle any other frames we can, otherwise 986 * complain about being unsupported (with debugging). 987 */ 988void 989ieee80211_recv_action(struct ieee80211_node *ni, 990 const uint8_t *frm, const uint8_t *efrm) 991{ 992 struct ieee80211com *ic = ni->ni_ic; 993 const struct ieee80211_action *ia; 994 int chw; 995 996 ia = (const struct ieee80211_action *) frm; 997 switch (ia->ia_category) { 998 case IEEE80211_ACTION_CAT_BA: 999 IEEE80211_NOTE(ic, 1000 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1001 "%s: BA action %d not implemented", __func__, 1002 ia->ia_action); 1003 ic->ic_stats.is_rx_mgtdiscard++; 1004 break; 1005 case IEEE80211_ACTION_CAT_HT: 1006 switch (ia->ia_action) { 1007 case IEEE80211_ACTION_HT_TXCHWIDTH: 1008 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1009 if (chw != ni->ni_chw) { 1010 ni->ni_chw = chw; 1011 ni->ni_flags |= IEEE80211_NODE_CHWUPDATE; 1012 } 1013 IEEE80211_NOTE(ic, 1014 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1015 "%s: HT txchwidth. width %d (%s)", 1016 __func__, chw, 1017 ni->ni_flags & IEEE80211_NODE_CHWUPDATE ? 1018 "new" : "no change"); 1019 break; 1020 default: 1021 IEEE80211_NOTE(ic, 1022 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1023 "%s: HT action %d not implemented", __func__, 1024 ia->ia_action); 1025 ic->ic_stats.is_rx_mgtdiscard++; 1026 break; 1027 } 1028 break; 1029 default: 1030 IEEE80211_NOTE(ic, 1031 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1032 "%s: category %d not implemented", __func__, 1033 ia->ia_category); 1034 ic->ic_stats.is_rx_mgtdiscard++; 1035 break; 1036 } 1037} 1038 1039/* 1040 * Transmit processing. 1041 */ 1042 1043/* 1044 * Request A-MPDU tx aggregation. Setup local state and 1045 * issue an ADDBA request. BA use will only happen after 1046 * the other end replies with ADDBA response. 1047 */ 1048int 1049ieee80211_ampdu_request(struct ieee80211_node *ni, 1050 struct ieee80211_tx_ampdu *tap) 1051{ 1052 struct ieee80211com *ic = ni->ni_ic; 1053 uint16_t args[4]; 1054 int tid, dialogtoken; 1055 static int tokens = 0; /* XXX */ 1056 1057 /* XXX locking */ 1058 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1059 /* do deferred setup of state */ 1060 /* XXX tap->txa_q */ 1061 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1062 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1063 } 1064 if (tap->txa_attempts >= IEEE80211_AGGR_MAXTRIES && 1065 (ticks - tap->txa_lastrequest) < IEEE80211_AGGR_MINRETRY) { 1066 /* 1067 * Don't retry too often; IEEE80211_AGGR_MINRETRY 1068 * defines the minimum interval we'll retry after 1069 * IEEE80211_AGGR_MAXTRIES failed attempts to 1070 * negotiate use. 1071 */ 1072 return 0; 1073 } 1074 dialogtoken = (tokens+1) % 63; /* XXX */ 1075 1076 tid = WME_AC_TO_TID(tap->txa_ac); 1077 args[0] = dialogtoken; 1078 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1079 | SM(tid, IEEE80211_BAPS_TID) 1080 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1081 ; 1082 args[2] = 0; /* batimeout */ 1083 args[3] = SM(0, IEEE80211_BASEQ_START) 1084 | SM(0, IEEE80211_BASEQ_FRAG) 1085 ; 1086 /* NB: do first so there's no race against reply */ 1087 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1088 /* unable to setup state, don't make request */ 1089 return 0; 1090 } 1091 tokens = dialogtoken; /* allocate token */ 1092 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1093 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1094} 1095 1096/* 1097 * Transmit a BAR frame to the specified node. The 1098 * BAR contents are drawn from the supplied aggregation 1099 * state associated with the node. 1100 */ 1101int 1102ieee80211_send_bar(struct ieee80211_node *ni, 1103 const struct ieee80211_tx_ampdu *tap) 1104{ 1105#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1106#define ADDSHORT(frm, v) do { \ 1107 frm[0] = (v) & 0xff; \ 1108 frm[1] = (v) >> 8; \ 1109 frm += 2; \ 1110} while (0) 1111 struct ieee80211com *ic = ni->ni_ic; 1112 struct ifnet *ifp = ic->ic_ifp; 1113 struct ieee80211_frame_min *wh; 1114 struct mbuf *m; 1115 uint8_t *frm; 1116 uint16_t barctl, barseqctl; 1117 int tid, ret; 1118 1119 ieee80211_ref_node(ni); 1120 1121 m = ieee80211_getmgtframe(&frm, 1122 ic->ic_headroom + sizeof(struct ieee80211_frame_min), 1123 sizeof(struct ieee80211_ba_request) 1124 ); 1125 if (m == NULL) 1126 senderr(ENOMEM, is_tx_nobuf); 1127 1128 wh = mtod(m, struct ieee80211_frame_min *); 1129 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | 1130 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 1131 wh->i_fc[1] = 0; 1132 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1133 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1134 1135 tid = WME_AC_TO_TID(tap->txa_ac); 1136 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 1137 IEEE80211_BAPS_POLICY_IMMEDIATE : 1138 IEEE80211_BAPS_POLICY_DELAYED) 1139 | SM(tid, IEEE80211_BAPS_TID) 1140 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ) 1141 ; 1142 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START) 1143 | SM(0, IEEE80211_BASEQ_FRAG) 1144 ; 1145 ADDSHORT(frm, barctl); 1146 ADDSHORT(frm, barseqctl); 1147 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1148 1149 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 1150 1151 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1152 "[%s] send bar frame (tid %u start %u) on channel %u\n", 1153 ether_sprintf(ni->ni_macaddr), tid, tap->txa_start, 1154 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1155 1156 m->m_pkthdr.rcvif = (void *)ni; 1157 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 1158 (*ifp->if_start)(ifp); 1159 1160 return 0; 1161bad: 1162 ieee80211_free_node(ni); 1163 return ret; 1164#undef ADDSHORT 1165#undef senderr 1166} 1167 1168/* 1169 * Send an action management frame. The arguments are stuff 1170 * into a frame without inspection; the caller is assumed to 1171 * prepare them carefully (e.g. based on the aggregation state). 1172 */ 1173int 1174ieee80211_send_action(struct ieee80211_node *ni, 1175 int category, int action, uint16_t args[4]) 1176{ 1177#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1178#define ADDSHORT(frm, v) do { \ 1179 frm[0] = (v) & 0xff; \ 1180 frm[1] = (v) >> 8; \ 1181 frm += 2; \ 1182} while (0) 1183 struct ieee80211com *ic = ni->ni_ic; 1184 struct mbuf *m; 1185 uint8_t *frm; 1186 uint16_t baparamset; 1187 int ret; 1188 1189 KASSERT(ni != NULL, ("null node")); 1190 1191 /* 1192 * Hold a reference on the node so it doesn't go away until after 1193 * the xmit is complete all the way in the driver. On error we 1194 * will remove our reference. 1195 */ 1196 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1197 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1198 __func__, __LINE__, 1199 ni, ether_sprintf(ni->ni_macaddr), 1200 ieee80211_node_refcnt(ni)+1); 1201 ieee80211_ref_node(ni); 1202 1203 m = ieee80211_getmgtframe(&frm, 1204 ic->ic_headroom + sizeof(struct ieee80211_frame), 1205 sizeof(uint16_t) /* action+category */ 1206 /* XXX may action payload */ 1207 + sizeof(struct ieee80211_action_ba_addbaresponse) 1208 ); 1209 if (m == NULL) 1210 senderr(ENOMEM, is_tx_nobuf); 1211 1212 *frm++ = category; 1213 *frm++ = action; 1214 switch (category) { 1215 case IEEE80211_ACTION_CAT_BA: 1216 switch (action) { 1217 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1218 IEEE80211_NOTE(ic, 1219 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1220 "send ADDBA request: tid %d, baparamset 0x%x", 1221 args[0], args[1]); 1222 1223 *frm++ = args[0]; /* dialog token */ 1224 ADDSHORT(frm, args[1]); /* baparamset */ 1225 ADDSHORT(frm, args[2]); /* batimeout */ 1226 ADDSHORT(frm, args[3]); /* baseqctl */ 1227 break; 1228 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1229 IEEE80211_NOTE(ic, 1230 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1231 "send ADDBA response: dialogtoken %d status %d " 1232 "baparamset 0x%x (tid %d) batimeout %d", 1233 args[0], args[1], args[2], 1234 MS(args[2], IEEE80211_BAPS_TID), args[3]); 1235 1236 *frm++ = args[0]; /* dialog token */ 1237 ADDSHORT(frm, args[1]); /* statuscode */ 1238 ADDSHORT(frm, args[2]); /* baparamset */ 1239 ADDSHORT(frm, args[3]); /* batimeout */ 1240 break; 1241 case IEEE80211_ACTION_BA_DELBA: 1242 /* XXX */ 1243 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 1244 | SM(args[1], IEEE80211_DELBAPS_INIT) 1245 ; 1246 ADDSHORT(frm, baparamset); 1247 ADDSHORT(frm, args[2]); /* reason code */ 1248 1249 IEEE80211_NOTE(ic, 1250 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1251 "send DELBA action: tid %d, initiator %d reason %d", 1252 args[0], args[1], args[2]); 1253 break; 1254 default: 1255 goto badaction; 1256 } 1257 break; 1258 case IEEE80211_ACTION_CAT_HT: 1259 switch (action) { 1260 case IEEE80211_ACTION_HT_TXCHWIDTH: 1261 IEEE80211_NOTE(ic, 1262 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1263 ni, "send HT txchwidth: width %d", 1264 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) ? 40 : 20 1265 ); 1266 *frm++ = IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) ? 1267 IEEE80211_A_HT_TXCHWIDTH_2040 : 1268 IEEE80211_A_HT_TXCHWIDTH_20; 1269 break; 1270 default: 1271 goto badaction; 1272 } 1273 break; 1274 default: 1275 badaction: 1276 IEEE80211_NOTE(ic, 1277 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1278 "%s: unsupported category %d action %d", __func__, 1279 category, action); 1280 senderr(EINVAL, is_tx_unknownmgt); 1281 /* NOTREACHED */ 1282 } 1283 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1284 1285 ret = ieee80211_mgmt_output(ic, ni, m, IEEE80211_FC0_SUBTYPE_ACTION); 1286 if (ret != 0) 1287 goto bad; 1288 return 0; 1289bad: 1290 ieee80211_free_node(ni); 1291 return ret; 1292#undef ADDSHORT 1293#undef senderr 1294} 1295 1296/* 1297 * Construct the MCS bit mask for inclusion 1298 * in an HT information element. 1299 */ 1300static void 1301ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1302{ 1303 int i; 1304 1305 for (i = 0; i < rs->rs_nrates; i++) { 1306 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1307 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 1308 /* NB: this assumes a particular implementation */ 1309 setbit(frm, r); 1310 } 1311 } 1312} 1313 1314/* 1315 * Add body of an HTCAP information element. 1316 */ 1317static uint8_t * 1318ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 1319{ 1320#define ADDSHORT(frm, v) do { \ 1321 frm[0] = (v) & 0xff; \ 1322 frm[1] = (v) >> 8; \ 1323 frm += 2; \ 1324} while (0) 1325 struct ieee80211com *ic = ni->ni_ic; 1326 uint16_t caps; 1327 1328 /* HT capabilities */ 1329 caps = ic->ic_htcaps & 0xffff; 1330 /* override 20/40 use based on channel and config */ 1331 if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1332 (ic->ic_flags_ext & IEEE80211_FEXT_USEHT40)) 1333 caps |= IEEE80211_HTCAP_CHWIDTH40; 1334 else 1335 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1336 /* adjust short GI based on channel and config */ 1337 if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 1338 caps &= ~IEEE80211_HTCAP_SHORTGI20; 1339 if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 1340 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 1341 caps &= ~IEEE80211_HTCAP_SHORTGI40; 1342 ADDSHORT(frm, caps); 1343 1344 /* HT parameters */ 1345 switch (ic->ic_ampdu_rxmax / 1024) { 1346 case 8: *frm = IEEE80211_HTCAP_MAXRXAMPDU_8K; break; 1347 case 16: *frm = IEEE80211_HTCAP_MAXRXAMPDU_16K; break; 1348 case 32: *frm = IEEE80211_HTCAP_MAXRXAMPDU_32K; break; 1349 default: *frm = IEEE80211_HTCAP_MAXRXAMPDU_64K; break; 1350 } 1351 *frm |= SM(ic->ic_ampdu_density, IEEE80211_HTCAP_MPDUDENSITY); 1352 frm++; 1353 1354 /* pre-zero remainder of ie */ 1355 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 1356 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 1357 1358 /* supported MCS set */ 1359 ieee80211_set_htrates(frm, &ni->ni_htrates); 1360 1361 frm += sizeof(struct ieee80211_ie_htcap) - 1362 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 1363 return frm; 1364#undef ADDSHORT 1365} 1366 1367/* 1368 * Add 802.11n HT capabilities information element 1369 */ 1370uint8_t * 1371ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 1372{ 1373 frm[0] = IEEE80211_ELEMID_HTCAP; 1374 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 1375 return ieee80211_add_htcap_body(frm + 2, ni); 1376} 1377 1378/* 1379 * Add Broadcom OUI wrapped standard HTCAP ie; this is 1380 * used for compatibility w/ pre-draft implementations. 1381 */ 1382uint8_t * 1383ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 1384{ 1385 frm[0] = IEEE80211_ELEMID_VENDOR; 1386 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 1387 frm[2] = (BCM_OUI >> 0) & 0xff; 1388 frm[3] = (BCM_OUI >> 8) & 0xff; 1389 frm[4] = (BCM_OUI >> 16) & 0xff; 1390 frm[5] = BCM_OUI_HTCAP; 1391 return ieee80211_add_htcap_body(frm + 6, ni); 1392} 1393 1394/* 1395 * Construct the MCS bit mask of basic rates 1396 * for inclusion in an HT information element. 1397 */ 1398static void 1399ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1400{ 1401 int i; 1402 1403 for (i = 0; i < rs->rs_nrates; i++) { 1404 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1405 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 1406 r < IEEE80211_HTRATE_MAXSIZE) { 1407 /* NB: this assumes a particular implementation */ 1408 setbit(frm, r); 1409 } 1410 } 1411} 1412 1413/* 1414 * Update the HTINFO ie for a beacon frame. 1415 */ 1416void 1417ieee80211_ht_update_beacon(struct ieee80211com *ic, 1418 struct ieee80211_beacon_offsets *bo) 1419{ 1420#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 1421 struct ieee80211_ie_htinfo *ht = 1422 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 1423 1424 /* XXX only update on channel change */ 1425 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, ic->ic_bsschan); 1426 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 1427 if (IEEE80211_IS_CHAN_HT40U(ic->ic_bsschan)) 1428 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 1429 else if (IEEE80211_IS_CHAN_HT40D(ic->ic_bsschan)) 1430 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 1431 else 1432 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 1433 if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan)) 1434 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 1435 1436 /* protection mode */ 1437 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 1438 1439 /* XXX propagate to vendor ie's */ 1440#undef PROTMODE 1441} 1442 1443/* 1444 * Add body of an HTINFO information element. 1445 */ 1446static uint8_t * 1447ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 1448{ 1449 struct ieee80211com *ic = ni->ni_ic; 1450 1451 /* pre-zero remainder of ie */ 1452 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 1453 1454 /* primary/control channel center */ 1455 *frm++ = ieee80211_chan2ieee(ic, ic->ic_bsschan); 1456 1457 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 1458 if (IEEE80211_IS_CHAN_HT40U(ic->ic_bsschan)) 1459 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 1460 else if (IEEE80211_IS_CHAN_HT40D(ic->ic_bsschan)) 1461 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 1462 else 1463 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 1464 if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan)) 1465 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 1466 1467 frm[1] = ic->ic_curhtprotmode; 1468 1469 frm += 5; 1470 1471 /* basic MCS set */ 1472 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 1473 frm += sizeof(struct ieee80211_ie_htinfo) - 1474 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 1475 return frm; 1476} 1477 1478/* 1479 * Add 802.11n HT information information element. 1480 */ 1481uint8_t * 1482ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 1483{ 1484 frm[0] = IEEE80211_ELEMID_HTINFO; 1485 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 1486 return ieee80211_add_htinfo_body(frm + 2, ni); 1487} 1488 1489/* 1490 * Add Broadcom OUI wrapped standard HTINFO ie; this is 1491 * used for compatibility w/ pre-draft implementations. 1492 */ 1493uint8_t * 1494ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 1495{ 1496 frm[0] = IEEE80211_ELEMID_VENDOR; 1497 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 1498 frm[2] = (BCM_OUI >> 0) & 0xff; 1499 frm[3] = (BCM_OUI >> 8) & 0xff; 1500 frm[4] = (BCM_OUI >> 16) & 0xff; 1501 frm[5] = BCM_OUI_HTINFO; 1502 return ieee80211_add_htinfo_body(frm + 6, ni); 1503} 1504