1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11n protocol support. 33 */ 34 35 #include "opt_inet.h" 36 #include "opt_wlan.h" 37 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/endian.h> 42 43 #include <sys/socket.h> 44 45 #include <net/if.h> 46 #include <net/if_media.h> 47 #include <net/ethernet.h> 48 49 #include <net80211/ieee80211_var.h> 50 #include <net80211/ieee80211_input.h> 51 52 /* define here, used throughout file */ 53 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 54 #define SM(_v, _f) (((_v) << _f##_S) & _f) 55 56 const struct ieee80211_mcs_rates ieee80211_htrates[16] = { 57 { 13, 14, 27, 30 }, /* MCS 0 */ 58 { 26, 29, 54, 60 }, /* MCS 1 */ 59 { 39, 43, 81, 90 }, /* MCS 2 */ 60 { 52, 58, 108, 120 }, /* MCS 3 */ 61 { 78, 87, 162, 180 }, /* MCS 4 */ 62 { 104, 116, 216, 240 }, /* MCS 5 */ 63 { 117, 130, 243, 270 }, /* MCS 6 */ 64 { 130, 144, 270, 300 }, /* MCS 7 */ 65 { 26, 29, 54, 60 }, /* MCS 8 */ 66 { 52, 58, 108, 120 }, /* MCS 9 */ 67 { 78, 87, 162, 180 }, /* MCS 10 */ 68 { 104, 116, 216, 240 }, /* MCS 11 */ 69 { 156, 173, 324, 360 }, /* MCS 12 */ 70 { 208, 231, 432, 480 }, /* MCS 13 */ 71 { 234, 260, 486, 540 }, /* MCS 14 */ 72 { 260, 289, 540, 600 } /* MCS 15 */ 73 }; 74 75 static const struct ieee80211_htrateset ieee80211_rateset_11n = 76 { 16, { 77 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 78 10, 11, 12, 13, 14, 15 } 79 }; 80 81 #ifdef IEEE80211_AMPDU_AGE 82 /* XXX public for sysctl hookup */ 83 int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 84 #endif 85 int ieee80211_recv_bar_ena = 1; 86 int ieee80211_addba_timeout = -1; /* timeout waiting for ADDBA response */ 87 int ieee80211_addba_backoff = -1; /* backoff after max ADDBA requests */ 88 int ieee80211_addba_maxtries = 3; /* max ADDBA requests before backoff */ 89 90 /* 91 * Setup HT parameters that depends on the clock frequency. 92 */ 93 static void 94 ieee80211_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 } 102 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL); 103 104 static int ieee80211_ampdu_enable(struct ieee80211_node *ni, 105 struct ieee80211_tx_ampdu *tap); 106 static int ieee80211_addba_request(struct ieee80211_node *ni, 107 struct ieee80211_tx_ampdu *tap, 108 int dialogtoken, int baparamset, int batimeout); 109 static int ieee80211_addba_response(struct ieee80211_node *ni, 110 struct ieee80211_tx_ampdu *tap, 111 int code, int baparamset, int batimeout); 112 static void ieee80211_addba_stop(struct ieee80211_node *ni, 113 struct ieee80211_tx_ampdu *tap); 114 static void ieee80211_aggr_recv_action(struct ieee80211_node *ni, 115 const uint8_t *frm, const uint8_t *efrm); 116 117 void 118 ieee80211_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 } 131 132 void 133 ieee80211_ht_detach(struct ieee80211com *ic) 134 { 135 } 136 137 void 138 ieee80211_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 } 181 182 void 183 ieee80211_ht_vdetach(struct ieee80211vap *vap) 184 { 185 } 186 187 static void 188 ht_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 } 206 207 void 208 ieee80211_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 } 215 216 const struct ieee80211_htrateset * 217 ieee80211_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 */ 232 struct mbuf * 233 ieee80211_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 */ 284 static void 285 ampdu_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 */ 308 static void 309 ampdu_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 */ 328 static void 329 ampdu_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_MPDU flag so it doesn't come back to us (it also 339 * permits ieee80211_input to optimize re-processing). 340 */ 341 static __inline void 342 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 343 { 344 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */ 345 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU_MPDU 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 */ 357 static void 358 ampdu_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 */ 404 static void 405 ampdu_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 */ 432 static void 433 ampdu_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 */ 506 int 507 ieee80211_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((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU, 521 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags)); 522 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 523 524 /* NB: m_len known to be sufficient */ 525 wh = mtod(m, struct ieee80211_qosframe *); 526 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) { 527 /* 528 * Not QoS data, shouldn't get here but just 529 * return it to the caller for processing. 530 */ 531 return PROCESS; 532 } 533 534 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 535 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 536 else 537 tid = wh->i_qos[0]; 538 tid &= IEEE80211_QOS_TID; 539 rap = &ni->ni_rx_ampdu[tid]; 540 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 541 /* 542 * No ADDBA request yet, don't touch. 543 */ 544 return PROCESS; 545 } 546 rxseq = le16toh(*(uint16_t *)wh->i_seq); 547 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) { 548 /* 549 * Fragments are not allowed; toss. 550 */ 551 IEEE80211_DISCARD_MAC(vap, 552 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 553 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid, 554 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 555 vap->iv_stats.is_ampdu_rx_drop++; 556 IEEE80211_NODE_STAT(ni, rx_drop); 557 m_freem(m); 558 return CONSUMED; 559 } 560 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT; 561 rap->rxa_nframes++; 562 again: 563 if (rxseq == rap->rxa_start) { 564 /* 565 * First frame in window. 566 */ 567 if (rap->rxa_qframes != 0) { 568 /* 569 * Dispatch as many packets as we can. 570 */ 571 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 572 ampdu_dispatch(ni, m); 573 ampdu_rx_dispatch(rap, ni); 574 return CONSUMED; 575 } else { 576 /* 577 * In order; advance window and notify 578 * caller to dispatch directly. 579 */ 580 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 581 return PROCESS; 582 } 583 } 584 /* 585 * Frame is out of order; store if in the BA window. 586 */ 587 /* calculate offset in BA window */ 588 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 589 if (off < rap->rxa_wnd) { 590 /* 591 * Common case (hopefully): in the BA window. 592 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 593 */ 594 #ifdef IEEE80211_AMPDU_AGE 595 /* 596 * Check for frames sitting too long in the reorder queue. 597 * This should only ever happen if frames are not delivered 598 * without the sender otherwise notifying us (e.g. with a 599 * BAR to move the window). Typically this happens because 600 * of vendor bugs that cause the sequence number to jump. 601 * When this happens we get a gap in the reorder queue that 602 * leaves frame sitting on the queue until they get pushed 603 * out due to window moves. When the vendor does not send 604 * BAR this move only happens due to explicit packet sends 605 * 606 * NB: we only track the time of the oldest frame in the 607 * reorder q; this means that if we flush we might push 608 * frames that still "new"; if this happens then subsequent 609 * frames will result in BA window moves which cost something 610 * but is still better than a big throughput dip. 611 */ 612 if (rap->rxa_qframes != 0) { 613 /* XXX honor batimeout? */ 614 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 615 /* 616 * Too long since we received the first 617 * frame; flush the reorder buffer. 618 */ 619 if (rap->rxa_qframes != 0) { 620 vap->iv_stats.is_ampdu_rx_age += 621 rap->rxa_qframes; 622 ampdu_rx_flush(ni, rap); 623 } 624 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 625 return PROCESS; 626 } 627 } else { 628 /* 629 * First frame, start aging timer. 630 */ 631 rap->rxa_age = ticks; 632 } 633 #endif /* IEEE80211_AMPDU_AGE */ 634 /* save packet */ 635 if (rap->rxa_m[off] == NULL) { 636 rap->rxa_m[off] = m; 637 rap->rxa_qframes++; 638 rap->rxa_qbytes += m->m_pkthdr.len; 639 vap->iv_stats.is_ampdu_rx_reorder++; 640 } else { 641 IEEE80211_DISCARD_MAC(vap, 642 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 643 ni->ni_macaddr, "a-mpdu duplicate", 644 "seqno %u tid %u BA win <%u:%u>", 645 rxseq, tid, rap->rxa_start, 646 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 647 vap->iv_stats.is_rx_dup++; 648 IEEE80211_NODE_STAT(ni, rx_dup); 649 m_freem(m); 650 } 651 return CONSUMED; 652 } 653 if (off < IEEE80211_SEQ_BA_RANGE) { 654 /* 655 * Outside the BA window, but within range; 656 * flush the reorder q and move the window. 657 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 658 */ 659 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 660 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 661 rap->rxa_start, 662 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 663 rap->rxa_qframes, rxseq, tid); 664 vap->iv_stats.is_ampdu_rx_move++; 665 666 /* 667 * The spec says to flush frames up to but not including: 668 * WinStart_B = rxseq - rap->rxa_wnd + 1 669 * Then insert the frame or notify the caller to process 670 * it immediately. We can safely do this by just starting 671 * over again because we know the frame will now be within 672 * the BA window. 673 */ 674 /* NB: rxa_wnd known to be >0 */ 675 ampdu_rx_flush_upto(ni, rap, 676 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 677 goto again; 678 } else { 679 /* 680 * Outside the BA window and out of range; toss. 681 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 682 */ 683 IEEE80211_DISCARD_MAC(vap, 684 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 685 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 686 rap->rxa_start, 687 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 688 rap->rxa_qframes, rxseq, tid, 689 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 690 vap->iv_stats.is_ampdu_rx_drop++; 691 IEEE80211_NODE_STAT(ni, rx_drop); 692 m_freem(m); 693 return CONSUMED; 694 } 695 #undef CONSUMED 696 #undef PROCESS 697 #undef IEEE80211_FC0_QOSDATA 698 } 699 700 /* 701 * Process a BAR ctl frame. Dispatch all frames up to 702 * the sequence number of the frame. If this frame is 703 * out of range it's discarded. 704 */ 705 void 706 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 707 { 708 struct ieee80211vap *vap = ni->ni_vap; 709 struct ieee80211_frame_bar *wh; 710 struct ieee80211_rx_ampdu *rap; 711 ieee80211_seq rxseq; 712 int tid, off; 713 714 if (!ieee80211_recv_bar_ena) { 715 #if 0 716 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 717 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 718 #endif 719 vap->iv_stats.is_ampdu_bar_bad++; 720 return; 721 } 722 wh = mtod(m0, struct ieee80211_frame_bar *); 723 /* XXX check basic BAR */ 724 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 725 rap = &ni->ni_rx_ampdu[tid]; 726 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 727 /* 728 * No ADDBA request yet, don't touch. 729 */ 730 IEEE80211_DISCARD_MAC(vap, 731 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 732 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 733 vap->iv_stats.is_ampdu_bar_bad++; 734 return; 735 } 736 vap->iv_stats.is_ampdu_bar_rx++; 737 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 738 if (rxseq == rap->rxa_start) 739 return; 740 /* calculate offset in BA window */ 741 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 742 if (off < IEEE80211_SEQ_BA_RANGE) { 743 /* 744 * Flush the reorder q up to rxseq and move the window. 745 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 746 */ 747 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 748 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 749 rap->rxa_start, 750 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 751 rap->rxa_qframes, rxseq, tid); 752 vap->iv_stats.is_ampdu_bar_move++; 753 754 ampdu_rx_flush_upto(ni, rap, rxseq); 755 if (off >= rap->rxa_wnd) { 756 /* 757 * BAR specifies a window start to the right of BA 758 * window; we must move it explicitly since 759 * ampdu_rx_flush_upto will not. 760 */ 761 rap->rxa_start = rxseq; 762 } 763 } else { 764 /* 765 * Out of range; toss. 766 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 767 */ 768 IEEE80211_DISCARD_MAC(vap, 769 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 770 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 771 rap->rxa_start, 772 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 773 rap->rxa_qframes, rxseq, tid, 774 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 775 vap->iv_stats.is_ampdu_bar_oow++; 776 IEEE80211_NODE_STAT(ni, rx_drop); 777 } 778 } 779 780 /* 781 * Setup HT-specific state in a node. Called only 782 * when HT use is negotiated so we don't do extra 783 * work for temporary and/or legacy sta's. 784 */ 785 void 786 ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap) 787 { 788 struct ieee80211_tx_ampdu *tap; 789 int ac; 790 791 if (ni->ni_flags & IEEE80211_NODE_HT) { 792 /* 793 * Clean AMPDU state on re-associate. This handles the case 794 * where a station leaves w/o notifying us and then returns 795 * before node is reaped for inactivity. 796 */ 797 ieee80211_ht_node_cleanup(ni); 798 } 799 ieee80211_parse_htcap(ni, htcap); 800 for (ac = 0; ac < WME_NUM_AC; ac++) { 801 tap = &ni->ni_tx_ampdu[ac]; 802 tap->txa_ac = ac; 803 /* NB: further initialization deferred */ 804 } 805 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 806 } 807 808 /* 809 * Cleanup HT-specific state in a node. Called only 810 * when HT use has been marked. 811 */ 812 void 813 ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 814 { 815 struct ieee80211com *ic = ni->ni_ic; 816 int i; 817 818 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 819 820 /* XXX optimize this */ 821 for (i = 0; i < WME_NUM_AC; i++) { 822 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 823 if (tap->txa_flags & IEEE80211_AGGR_SETUP) { 824 /* 825 * Stop BA stream if setup so driver has a chance 826 * to reclaim any resources it might have allocated. 827 */ 828 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]); 829 tap->txa_lastsample = 0; 830 tap->txa_avgpps = 0; 831 /* NB: clearing NAK means we may re-send ADDBA */ 832 tap->txa_flags &= 833 ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 834 } 835 } 836 for (i = 0; i < WME_NUM_TID; i++) 837 ampdu_rx_stop(&ni->ni_rx_ampdu[i]); 838 839 ni->ni_htcap = 0; 840 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL; 841 } 842 843 /* 844 * Age out HT resources for a station. 845 */ 846 void 847 ieee80211_ht_node_age(struct ieee80211_node *ni) 848 { 849 #ifdef IEEE80211_AMPDU_AGE 850 struct ieee80211vap *vap = ni->ni_vap; 851 uint8_t tid; 852 #endif 853 854 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 855 856 #ifdef IEEE80211_AMPDU_AGE 857 for (tid = 0; tid < WME_NUM_TID; tid++) { 858 struct ieee80211_rx_ampdu *rap; 859 860 rap = &ni->ni_rx_ampdu[tid]; 861 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 862 continue; 863 if (rap->rxa_qframes == 0) 864 continue; 865 /* 866 * Check for frames sitting too long in the reorder queue. 867 * See above for more details on what's happening here. 868 */ 869 /* XXX honor batimeout? */ 870 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 871 /* 872 * Too long since we received the first 873 * frame; flush the reorder buffer. 874 */ 875 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 876 ampdu_rx_flush(ni, rap); 877 } 878 } 879 #endif /* IEEE80211_AMPDU_AGE */ 880 } 881 882 static struct ieee80211_channel * 883 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 884 { 885 return ieee80211_find_channel(ic, c->ic_freq, 886 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 887 } 888 889 /* 890 * Adjust a channel to be HT/non-HT according to the vap's configuration. 891 */ 892 struct ieee80211_channel * 893 ieee80211_ht_adjust_channel(struct ieee80211com *ic, 894 struct ieee80211_channel *chan, int flags) 895 { 896 struct ieee80211_channel *c; 897 898 if (flags & IEEE80211_FEXT_HT) { 899 /* promote to HT if possible */ 900 if (flags & IEEE80211_FEXT_USEHT40) { 901 if (!IEEE80211_IS_CHAN_HT40(chan)) { 902 /* NB: arbitrarily pick ht40+ over ht40- */ 903 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 904 if (c == NULL) 905 c = findhtchan(ic, chan, 906 IEEE80211_CHAN_HT40D); 907 if (c == NULL) 908 c = findhtchan(ic, chan, 909 IEEE80211_CHAN_HT20); 910 if (c != NULL) 911 chan = c; 912 } 913 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 914 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 915 if (c != NULL) 916 chan = c; 917 } 918 } else if (IEEE80211_IS_CHAN_HT(chan)) { 919 /* demote to legacy, HT use is disabled */ 920 c = ieee80211_find_channel(ic, chan->ic_freq, 921 chan->ic_flags &~ IEEE80211_CHAN_HT); 922 if (c != NULL) 923 chan = c; 924 } 925 return chan; 926 } 927 928 /* 929 * Setup HT-specific state for a legacy WDS peer. 930 */ 931 void 932 ieee80211_ht_wds_init(struct ieee80211_node *ni) 933 { 934 struct ieee80211vap *vap = ni->ni_vap; 935 struct ieee80211_tx_ampdu *tap; 936 int ac; 937 938 KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested")); 939 940 /* XXX check scan cache in case peer has an ap and we have info */ 941 /* 942 * If setup with a legacy channel; locate an HT channel. 943 * Otherwise if the inherited channel (from a companion 944 * AP) is suitable use it so we use the same location 945 * for the extension channel). 946 */ 947 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 948 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 949 950 ni->ni_htcap = 0; 951 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) 952 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 953 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 954 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 955 ni->ni_chw = 40; 956 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 957 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 958 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 959 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 960 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) 961 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 962 } else { 963 ni->ni_chw = 20; 964 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 965 } 966 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 967 968 ni->ni_htopmode = 0; /* XXX need protection state */ 969 ni->ni_htstbc = 0; /* XXX need info */ 970 971 for (ac = 0; ac < WME_NUM_AC; ac++) { 972 tap = &ni->ni_tx_ampdu[ac]; 973 tap->txa_ac = ac; 974 } 975 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */ 976 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 977 } 978 979 /* 980 * Notify hostap vaps of a change in the HTINFO ie. 981 */ 982 static void 983 htinfo_notify(struct ieee80211com *ic) 984 { 985 struct ieee80211vap *vap; 986 int first = 1; 987 988 IEEE80211_LOCK_ASSERT(ic); 989 990 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 991 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 992 continue; 993 if (first) { 994 IEEE80211_NOTE(vap, 995 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 996 vap->iv_bss, 997 "HT bss occupancy change: %d sta, %d ht, " 998 "%d ht40%s, HT protmode now 0x%x" 999 , ic->ic_sta_assoc 1000 , ic->ic_ht_sta_assoc 1001 , ic->ic_ht40_sta_assoc 1002 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ? 1003 ", non-HT sta present" : "" 1004 , ic->ic_curhtprotmode); 1005 first = 0; 1006 } 1007 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 1008 } 1009 } 1010 1011 /* 1012 * Calculate HT protection mode from current 1013 * state and handle updates. 1014 */ 1015 static void 1016 htinfo_update(struct ieee80211com *ic) 1017 { 1018 uint8_t protmode; 1019 1020 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1021 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1022 | IEEE80211_HTINFO_NONHT_PRESENT; 1023 } else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) { 1024 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1025 | IEEE80211_HTINFO_NONHT_PRESENT; 1026 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1027 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1028 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1029 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1030 } else { 1031 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1032 } 1033 if (protmode != ic->ic_curhtprotmode) { 1034 ic->ic_curhtprotmode = protmode; 1035 htinfo_notify(ic); 1036 } 1037 } 1038 1039 /* 1040 * Handle an HT station joining a BSS. 1041 */ 1042 void 1043 ieee80211_ht_node_join(struct ieee80211_node *ni) 1044 { 1045 struct ieee80211com *ic = ni->ni_ic; 1046 1047 IEEE80211_LOCK_ASSERT(ic); 1048 1049 if (ni->ni_flags & IEEE80211_NODE_HT) { 1050 ic->ic_ht_sta_assoc++; 1051 if (ni->ni_chw == 40) 1052 ic->ic_ht40_sta_assoc++; 1053 } 1054 htinfo_update(ic); 1055 } 1056 1057 /* 1058 * Handle an HT station leaving a BSS. 1059 */ 1060 void 1061 ieee80211_ht_node_leave(struct ieee80211_node *ni) 1062 { 1063 struct ieee80211com *ic = ni->ni_ic; 1064 1065 IEEE80211_LOCK_ASSERT(ic); 1066 1067 if (ni->ni_flags & IEEE80211_NODE_HT) { 1068 ic->ic_ht_sta_assoc--; 1069 if (ni->ni_chw == 40) 1070 ic->ic_ht40_sta_assoc--; 1071 } 1072 htinfo_update(ic); 1073 } 1074 1075 /* 1076 * Public version of htinfo_update; used for processing 1077 * beacon frames from overlapping bss. 1078 * 1079 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1080 * (on receipt of a beacon that advertises MIXED) or 1081 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1082 * from an overlapping legacy bss). We treat MIXED with 1083 * a higher precedence than PROTOPT (i.e. we will not change 1084 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1085 * corresponds to how we handle things in htinfo_update. 1086 */ 1087 void 1088 ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1089 { 1090 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1091 IEEE80211_LOCK(ic); 1092 1093 /* track non-HT station presence */ 1094 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1095 ("protmode 0x%x", protmode)); 1096 ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR; 1097 ic->ic_lastnonht = ticks; 1098 1099 if (protmode != ic->ic_curhtprotmode && 1100 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED || 1101 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) { 1102 /* push beacon update */ 1103 ic->ic_curhtprotmode = protmode; 1104 htinfo_notify(ic); 1105 } 1106 IEEE80211_UNLOCK(ic); 1107 #undef OPMODE 1108 } 1109 1110 /* 1111 * Time out presence of an overlapping bss with non-HT 1112 * stations. When operating in hostap mode we listen for 1113 * beacons from other stations and if we identify a non-HT 1114 * station is present we update the opmode field of the 1115 * HTINFO ie. To identify when all non-HT stations are 1116 * gone we time out this condition. 1117 */ 1118 void 1119 ieee80211_ht_timeout(struct ieee80211com *ic) 1120 { 1121 IEEE80211_LOCK_ASSERT(ic); 1122 1123 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) && 1124 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1125 #if 0 1126 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1127 "%s", "time out non-HT STA present on channel"); 1128 #endif 1129 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 1130 htinfo_update(ic); 1131 } 1132 } 1133 1134 /* unalligned little endian access */ 1135 #define LE_READ_2(p) \ 1136 ((uint16_t) \ 1137 ((((const uint8_t *)(p))[0] ) | \ 1138 (((const uint8_t *)(p))[1] << 8))) 1139 1140 /* 1141 * Process an 802.11n HT capabilities ie. 1142 */ 1143 void 1144 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1145 { 1146 struct ieee80211vap *vap = ni->ni_vap; 1147 1148 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1149 /* 1150 * Station used Vendor OUI ie to associate; 1151 * mark the node so when we respond we'll use 1152 * the Vendor OUI's and not the standard ie's. 1153 */ 1154 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1155 ie += 4; 1156 } else 1157 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1158 1159 ni->ni_htcap = LE_READ_2(ie + 1160 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1161 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1162 /* XXX needed or will ieee80211_parse_htinfo always be called? */ 1163 ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1164 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20; 1165 } 1166 1167 /* 1168 * Process an 802.11n HT info ie and update the node state. 1169 * Note that we handle use this information to identify the 1170 * correct channel (HT20, HT40+, HT40-, legacy). The caller 1171 * is responsible for insuring any required channel change is 1172 * done (e.g. in sta mode when parsing the contents of a 1173 * beacon frame). 1174 */ 1175 void 1176 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1177 { 1178 struct ieee80211com *ic = ni->ni_ic; 1179 struct ieee80211vap *vap = ni->ni_vap; 1180 const struct ieee80211_ie_htinfo *htinfo; 1181 struct ieee80211_channel *c; 1182 uint16_t w; 1183 int htflags, chanflags; 1184 1185 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1186 ie += 4; 1187 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1188 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1189 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1190 w = LE_READ_2(&htinfo->hi_byte2); 1191 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1192 w = LE_READ_2(&htinfo->hi_byte45); 1193 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1194 /* 1195 * Handle 11n channel switch. Use the received HT ie's to 1196 * identify the right channel to use. If we cannot locate it 1197 * in the channel table then fallback to legacy operation. 1198 */ 1199 /* NB: honor operating mode constraint */ 1200 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1201 IEEE80211_CHAN_HT20 : 0; 1202 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1203 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1204 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1205 htflags = IEEE80211_CHAN_HT40U; 1206 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1207 htflags = IEEE80211_CHAN_HT40D; 1208 } 1209 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1210 if (chanflags != ni->ni_chan->ic_flags) { 1211 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1212 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1213 /* 1214 * No HT40 channel entry in our table; fall back 1215 * to HT20 operation. This should not happen. 1216 */ 1217 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1218 IEEE80211_NOTE(vap, 1219 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1220 "no HT40 channel (freq %u), falling back to HT20", 1221 ni->ni_chan->ic_freq); 1222 /* XXX stat */ 1223 } 1224 if (c != NULL && c != ni->ni_chan) { 1225 IEEE80211_NOTE(vap, 1226 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1227 "switch station to HT%d channel %u/0x%x", 1228 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1229 c->ic_freq, c->ic_flags); 1230 ni->ni_chan = c; 1231 } 1232 /* NB: caller responsible for forcing any channel change */ 1233 } 1234 /* update node's tx channel width */ 1235 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1236 } 1237 1238 /* 1239 * Install received HT rate set by parsing the HT cap ie. 1240 */ 1241 int 1242 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1243 { 1244 struct ieee80211vap *vap = ni->ni_vap; 1245 const struct ieee80211_ie_htcap *htcap; 1246 struct ieee80211_htrateset *rs; 1247 int i; 1248 1249 rs = &ni->ni_htrates; 1250 memset(rs, 0, sizeof(*rs)); 1251 if (ie != NULL) { 1252 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1253 ie += 4; 1254 htcap = (const struct ieee80211_ie_htcap *) ie; 1255 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1256 if (isclr(htcap->hc_mcsset, i)) 1257 continue; 1258 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1259 IEEE80211_NOTE(vap, 1260 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1261 "WARNING, HT rate set too large; only " 1262 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1263 vap->iv_stats.is_rx_rstoobig++; 1264 break; 1265 } 1266 rs->rs_rates[rs->rs_nrates++] = i; 1267 } 1268 } 1269 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1270 } 1271 1272 /* 1273 * Mark rates in a node's HT rate set as basic according 1274 * to the information in the supplied HT info ie. 1275 */ 1276 void 1277 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1278 { 1279 const struct ieee80211_ie_htinfo *htinfo; 1280 struct ieee80211_htrateset *rs; 1281 int i, j; 1282 1283 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1284 ie += 4; 1285 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1286 rs = &ni->ni_htrates; 1287 if (rs->rs_nrates == 0) { 1288 IEEE80211_NOTE(ni->ni_vap, 1289 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1290 "%s", "WARNING, empty HT rate set"); 1291 return; 1292 } 1293 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1294 if (isclr(htinfo->hi_basicmcsset, i)) 1295 continue; 1296 for (j = 0; j < rs->rs_nrates; j++) 1297 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1298 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1299 } 1300 } 1301 1302 static void 1303 addba_timeout(void *arg) 1304 { 1305 struct ieee80211_tx_ampdu *tap = arg; 1306 1307 /* XXX ? */ 1308 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1309 tap->txa_attempts++; 1310 } 1311 1312 static void 1313 addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1314 { 1315 /* XXX use CALLOUT_PENDING instead? */ 1316 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1317 addba_timeout, tap); 1318 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1319 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1320 } 1321 1322 static void 1323 addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1324 { 1325 /* XXX use CALLOUT_PENDING instead? */ 1326 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1327 callout_stop(&tap->txa_timer); 1328 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1329 } 1330 } 1331 1332 /* 1333 * Default method for requesting A-MPDU tx aggregation. 1334 * We setup the specified state block and start a timer 1335 * to wait for an ADDBA response frame. 1336 */ 1337 static int 1338 ieee80211_addba_request(struct ieee80211_node *ni, 1339 struct ieee80211_tx_ampdu *tap, 1340 int dialogtoken, int baparamset, int batimeout) 1341 { 1342 int bufsiz; 1343 1344 /* XXX locking */ 1345 tap->txa_token = dialogtoken; 1346 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1347 tap->txa_start = 0; 1348 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1349 tap->txa_wnd = (bufsiz == 0) ? 1350 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1351 addba_start_timeout(tap); 1352 return 1; 1353 } 1354 1355 /* 1356 * Default method for processing an A-MPDU tx aggregation 1357 * response. We shutdown any pending timer and update the 1358 * state block according to the reply. 1359 */ 1360 static int 1361 ieee80211_addba_response(struct ieee80211_node *ni, 1362 struct ieee80211_tx_ampdu *tap, 1363 int status, int baparamset, int batimeout) 1364 { 1365 int bufsiz; 1366 1367 /* XXX locking */ 1368 addba_stop_timeout(tap); 1369 if (status == IEEE80211_STATUS_SUCCESS) { 1370 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1371 /* XXX override our request? */ 1372 tap->txa_wnd = (bufsiz == 0) ? 1373 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1374 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1375 } else { 1376 /* mark tid so we don't try again */ 1377 tap->txa_flags |= IEEE80211_AGGR_NAK; 1378 } 1379 return 1; 1380 } 1381 1382 /* 1383 * Default method for stopping A-MPDU tx aggregation. 1384 * Any timer is cleared and we drain any pending frames. 1385 */ 1386 static void 1387 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1388 { 1389 /* XXX locking */ 1390 addba_stop_timeout(tap); 1391 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1392 /* XXX clear aggregation queue */ 1393 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1394 } 1395 tap->txa_attempts = 0; 1396 } 1397 1398 /* 1399 * Process a received action frame using the default aggregation 1400 * policy. We intercept ADDBA-related frames and use them to 1401 * update our aggregation state. All other frames are passed up 1402 * for processing by ieee80211_recv_action. 1403 */ 1404 static void 1405 ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1406 const uint8_t *frm, const uint8_t *efrm) 1407 { 1408 struct ieee80211com *ic = ni->ni_ic; 1409 struct ieee80211vap *vap = ni->ni_vap; 1410 const struct ieee80211_action *ia; 1411 struct ieee80211_rx_ampdu *rap; 1412 struct ieee80211_tx_ampdu *tap; 1413 uint8_t dialogtoken, policy; 1414 uint16_t baparamset, batimeout, baseqctl, code; 1415 uint16_t args[4]; 1416 int tid, ac, bufsiz; 1417 1418 ia = (const struct ieee80211_action *) frm; 1419 switch (ia->ia_category) { 1420 case IEEE80211_ACTION_CAT_BA: 1421 switch (ia->ia_action) { 1422 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1423 dialogtoken = frm[2]; 1424 baparamset = LE_READ_2(frm+3); 1425 batimeout = LE_READ_2(frm+5); 1426 baseqctl = LE_READ_2(frm+7); 1427 1428 tid = MS(baparamset, IEEE80211_BAPS_TID); 1429 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1430 1431 IEEE80211_NOTE(vap, 1432 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1433 "recv ADDBA request: dialogtoken %u " 1434 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1435 "baseqctl %d:%d", 1436 dialogtoken, baparamset, tid, bufsiz, batimeout, 1437 MS(baseqctl, IEEE80211_BASEQ_START), 1438 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1439 1440 rap = &ni->ni_rx_ampdu[tid]; 1441 1442 /* Send ADDBA response */ 1443 args[0] = dialogtoken; 1444 /* 1445 * NB: We ack only if the sta associated with HT and 1446 * the ap is configured to do AMPDU rx (the latter 1447 * violates the 11n spec and is mostly for testing). 1448 */ 1449 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1450 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) { 1451 ampdu_rx_start(rap, bufsiz, 1452 MS(baseqctl, IEEE80211_BASEQ_START)); 1453 1454 args[1] = IEEE80211_STATUS_SUCCESS; 1455 } else { 1456 IEEE80211_NOTE(vap, 1457 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1458 ni, "reject ADDBA request: %s", 1459 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1460 "administratively disabled" : 1461 "not negotiated for station"); 1462 vap->iv_stats.is_addba_reject++; 1463 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1464 } 1465 /* XXX honor rap flags? */ 1466 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1467 | SM(tid, IEEE80211_BAPS_TID) 1468 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1469 ; 1470 args[3] = 0; 1471 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1472 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1473 return; 1474 1475 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1476 dialogtoken = frm[2]; 1477 code = LE_READ_2(frm+3); 1478 baparamset = LE_READ_2(frm+5); 1479 tid = MS(baparamset, IEEE80211_BAPS_TID); 1480 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1481 policy = MS(baparamset, IEEE80211_BAPS_POLICY); 1482 batimeout = LE_READ_2(frm+7); 1483 1484 ac = TID_TO_WME_AC(tid); 1485 tap = &ni->ni_tx_ampdu[ac]; 1486 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1487 IEEE80211_DISCARD_MAC(vap, 1488 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1489 ni->ni_macaddr, "ADDBA response", 1490 "no pending ADDBA, tid %d dialogtoken %u " 1491 "code %d", tid, dialogtoken, code); 1492 vap->iv_stats.is_addba_norequest++; 1493 return; 1494 } 1495 if (dialogtoken != tap->txa_token) { 1496 IEEE80211_DISCARD_MAC(vap, 1497 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1498 ni->ni_macaddr, "ADDBA response", 1499 "dialogtoken mismatch: waiting for %d, " 1500 "received %d, tid %d code %d", 1501 tap->txa_token, dialogtoken, tid, code); 1502 vap->iv_stats.is_addba_badtoken++; 1503 return; 1504 } 1505 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */ 1506 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) { 1507 IEEE80211_DISCARD_MAC(vap, 1508 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1509 ni->ni_macaddr, "ADDBA response", 1510 "policy mismatch: expecting %s, " 1511 "received %s, tid %d code %d", 1512 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE, 1513 policy, tid, code); 1514 vap->iv_stats.is_addba_badpolicy++; 1515 return; 1516 } 1517 #if 0 1518 /* XXX we take MIN in ieee80211_addba_response */ 1519 if (bufsiz > IEEE80211_AGGR_BAWMAX) { 1520 IEEE80211_DISCARD_MAC(vap, 1521 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1522 ni->ni_macaddr, "ADDBA response", 1523 "BA window too large: max %d, " 1524 "received %d, tid %d code %d", 1525 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code); 1526 vap->iv_stats.is_addba_badbawinsize++; 1527 return; 1528 } 1529 #endif 1530 1531 IEEE80211_NOTE(vap, 1532 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1533 "recv ADDBA response: dialogtoken %u code %d " 1534 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1535 dialogtoken, code, baparamset, tid, bufsiz, 1536 batimeout); 1537 ic->ic_addba_response(ni, tap, 1538 code, baparamset, batimeout); 1539 return; 1540 1541 case IEEE80211_ACTION_BA_DELBA: 1542 baparamset = LE_READ_2(frm+2); 1543 code = LE_READ_2(frm+4); 1544 1545 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1546 1547 IEEE80211_NOTE(vap, 1548 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1549 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1550 "code %d", baparamset, tid, 1551 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1552 1553 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1554 ac = TID_TO_WME_AC(tid); 1555 tap = &ni->ni_tx_ampdu[ac]; 1556 ic->ic_addba_stop(ni, tap); 1557 } else { 1558 rap = &ni->ni_rx_ampdu[tid]; 1559 ampdu_rx_stop(rap); 1560 } 1561 return; 1562 } 1563 break; 1564 } 1565 ieee80211_recv_action(ni, frm, efrm); 1566 } 1567 1568 /* 1569 * Process a received 802.11n action frame. 1570 * Aggregation-related frames are assumed to be handled 1571 * already; we handle any other frames we can, otherwise 1572 * complain about being unsupported (with debugging). 1573 */ 1574 void 1575 ieee80211_recv_action(struct ieee80211_node *ni, 1576 const uint8_t *frm, const uint8_t *efrm) 1577 { 1578 struct ieee80211vap *vap = ni->ni_vap; 1579 const struct ieee80211_action *ia; 1580 int chw; 1581 1582 ia = (const struct ieee80211_action *) frm; 1583 switch (ia->ia_category) { 1584 case IEEE80211_ACTION_CAT_BA: 1585 IEEE80211_NOTE(vap, 1586 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1587 "%s: BA action %d not implemented", __func__, 1588 ia->ia_action); 1589 vap->iv_stats.is_rx_mgtdiscard++; 1590 break; 1591 case IEEE80211_ACTION_CAT_HT: 1592 switch (ia->ia_action) { 1593 case IEEE80211_ACTION_HT_TXCHWIDTH: 1594 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1595 IEEE80211_NOTE(vap, 1596 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1597 "%s: HT txchwidth, width %d%s", 1598 __func__, chw, ni->ni_chw != chw ? "*" : ""); 1599 if (chw != ni->ni_chw) { 1600 ni->ni_chw = chw; 1601 /* XXX notify on change */ 1602 } 1603 break; 1604 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 1605 IEEE80211_NOTE(vap, 1606 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1607 "%s: HT MIMO PS", __func__); 1608 break; 1609 default: 1610 IEEE80211_NOTE(vap, 1611 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1612 "%s: HT action %d not implemented", __func__, 1613 ia->ia_action); 1614 vap->iv_stats.is_rx_mgtdiscard++; 1615 break; 1616 } 1617 break; 1618 default: 1619 IEEE80211_NOTE(vap, 1620 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1621 "%s: category %d not implemented", __func__, 1622 ia->ia_category); 1623 vap->iv_stats.is_rx_mgtdiscard++; 1624 break; 1625 } 1626 } 1627 1628 /* 1629 * Transmit processing. 1630 */ 1631 1632 /* 1633 * Check if A-MPDU should be requested/enabled for a stream. 1634 * We require a traffic rate above a per-AC threshold and we 1635 * also handle backoff from previous failed attempts. 1636 * 1637 * Drivers may override this method to bring in information 1638 * such as link state conditions in making the decision. 1639 */ 1640 static int 1641 ieee80211_ampdu_enable(struct ieee80211_node *ni, 1642 struct ieee80211_tx_ampdu *tap) 1643 { 1644 struct ieee80211vap *vap = ni->ni_vap; 1645 1646 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1647 return 0; 1648 /* XXX check rssi? */ 1649 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1650 ticks < tap->txa_nextrequest) { 1651 /* 1652 * Don't retry too often; txa_nextrequest is set 1653 * to the minimum interval we'll retry after 1654 * ieee80211_addba_maxtries failed attempts are made. 1655 */ 1656 return 0; 1657 } 1658 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1659 "enable AMPDU on %s, avgpps %d pkts %d", 1660 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts); 1661 return 1; 1662 } 1663 1664 /* 1665 * Request A-MPDU tx aggregation. Setup local state and 1666 * issue an ADDBA request. BA use will only happen after 1667 * the other end replies with ADDBA response. 1668 */ 1669 int 1670 ieee80211_ampdu_request(struct ieee80211_node *ni, 1671 struct ieee80211_tx_ampdu *tap) 1672 { 1673 struct ieee80211com *ic = ni->ni_ic; 1674 uint16_t args[4]; 1675 int tid, dialogtoken; 1676 static int tokens = 0; /* XXX */ 1677 1678 /* XXX locking */ 1679 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1680 /* do deferred setup of state */ 1681 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1682 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1683 } 1684 /* XXX hack for not doing proper locking */ 1685 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1686 1687 dialogtoken = (tokens+1) % 63; /* XXX */ 1688 tid = WME_AC_TO_TID(tap->txa_ac); 1689 tap->txa_start = ni->ni_txseqs[tid]; 1690 1691 tid = WME_AC_TO_TID(tap->txa_ac); 1692 args[0] = dialogtoken; 1693 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1694 | SM(tid, IEEE80211_BAPS_TID) 1695 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1696 ; 1697 args[2] = 0; /* batimeout */ 1698 /* NB: do first so there's no race against reply */ 1699 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1700 /* unable to setup state, don't make request */ 1701 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1702 ni, "%s: could not setup BA stream for AC %d", 1703 __func__, tap->txa_ac); 1704 /* defer next try so we don't slam the driver with requests */ 1705 tap->txa_attempts = ieee80211_addba_maxtries; 1706 /* NB: check in case driver wants to override */ 1707 if (tap->txa_nextrequest <= ticks) 1708 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 1709 return 0; 1710 } 1711 tokens = dialogtoken; /* allocate token */ 1712 /* NB: after calling ic_addba_request so driver can set txa_start */ 1713 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START) 1714 | SM(0, IEEE80211_BASEQ_FRAG) 1715 ; 1716 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1717 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1718 } 1719 1720 /* 1721 * Terminate an AMPDU tx stream. State is reclaimed 1722 * and the peer notified with a DelBA Action frame. 1723 */ 1724 void 1725 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap, 1726 int reason) 1727 { 1728 struct ieee80211com *ic = ni->ni_ic; 1729 struct ieee80211vap *vap = ni->ni_vap; 1730 uint16_t args[4]; 1731 1732 /* XXX locking */ 1733 if (IEEE80211_AMPDU_RUNNING(tap)) { 1734 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1735 ni, "%s: stop BA stream for AC %d (reason %d)", 1736 __func__, tap->txa_ac, reason); 1737 vap->iv_stats.is_ampdu_stop++; 1738 1739 ic->ic_addba_stop(ni, tap); 1740 args[0] = WME_AC_TO_TID(tap->txa_ac); 1741 args[1] = IEEE80211_DELBAPS_INIT; 1742 args[2] = reason; /* XXX reason code */ 1743 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1744 IEEE80211_ACTION_BA_DELBA, args); 1745 } else { 1746 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1747 ni, "%s: BA stream for AC %d not running (reason %d)", 1748 __func__, tap->txa_ac, reason); 1749 vap->iv_stats.is_ampdu_stop_failed++; 1750 } 1751 } 1752 1753 /* 1754 * Transmit a BAR frame to the specified node. The 1755 * BAR contents are drawn from the supplied aggregation 1756 * state associated with the node. 1757 */ 1758 int 1759 ieee80211_send_bar(struct ieee80211_node *ni, 1760 const struct ieee80211_tx_ampdu *tap) 1761 { 1762 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1763 #define ADDSHORT(frm, v) do { \ 1764 frm[0] = (v) & 0xff; \ 1765 frm[1] = (v) >> 8; \ 1766 frm += 2; \ 1767 } while (0) 1768 struct ieee80211vap *vap = ni->ni_vap; 1769 struct ieee80211com *ic = ni->ni_ic; 1770 struct ieee80211_frame_min *wh; 1771 struct mbuf *m; 1772 uint8_t *frm; 1773 uint16_t barctl, barseqctl; 1774 int tid, ret; 1775 1776 ieee80211_ref_node(ni); 1777 1778 m = ieee80211_getmgtframe(&frm, 1779 ic->ic_headroom + sizeof(struct ieee80211_frame_min), 1780 sizeof(struct ieee80211_ba_request) 1781 ); 1782 if (m == NULL) 1783 senderr(ENOMEM, is_tx_nobuf); 1784 1785 wh = mtod(m, struct ieee80211_frame_min *); 1786 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | 1787 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 1788 wh->i_fc[1] = 0; 1789 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1790 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1791 1792 tid = WME_AC_TO_TID(tap->txa_ac); 1793 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 1794 IEEE80211_BAPS_POLICY_IMMEDIATE : 1795 IEEE80211_BAPS_POLICY_DELAYED) 1796 | SM(tid, IEEE80211_BAPS_TID) 1797 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ) 1798 ; 1799 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START) 1800 | SM(0, IEEE80211_BASEQ_FRAG) 1801 ; 1802 ADDSHORT(frm, barctl); 1803 ADDSHORT(frm, barseqctl); 1804 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1805 1806 M_WME_SETAC(m, WME_AC_VO); 1807 1808 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 1809 1810 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1811 ni, "send bar frame (tid %u start %u) on channel %u", 1812 tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan)); 1813 1814 return ic->ic_raw_xmit(ni, m, NULL); 1815 bad: 1816 ieee80211_free_node(ni); 1817 return ret; 1818 #undef ADDSHORT 1819 #undef senderr 1820 } 1821 1822 /* 1823 * Send an action management frame. The arguments are stuff 1824 * into a frame without inspection; the caller is assumed to 1825 * prepare them carefully (e.g. based on the aggregation state). 1826 */ 1827 int 1828 ieee80211_send_action(struct ieee80211_node *ni, 1829 int category, int action, uint16_t args[4]) 1830 { 1831 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1832 #define ADDSHORT(frm, v) do { \ 1833 frm[0] = (v) & 0xff; \ 1834 frm[1] = (v) >> 8; \ 1835 frm += 2; \ 1836 } while (0) 1837 struct ieee80211vap *vap = ni->ni_vap; 1838 struct ieee80211com *ic = ni->ni_ic; 1839 struct mbuf *m; 1840 uint8_t *frm; 1841 uint16_t baparamset; 1842 int ret; 1843 1844 KASSERT(ni != NULL, ("null node")); 1845 1846 /* 1847 * Hold a reference on the node so it doesn't go away until after 1848 * the xmit is complete all the way in the driver. On error we 1849 * will remove our reference. 1850 */ 1851 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1852 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1853 __func__, __LINE__, 1854 ni, ether_sprintf(ni->ni_macaddr), 1855 ieee80211_node_refcnt(ni)+1); 1856 ieee80211_ref_node(ni); 1857 1858 m = ieee80211_getmgtframe(&frm, 1859 ic->ic_headroom + sizeof(struct ieee80211_frame), 1860 sizeof(uint16_t) /* action+category */ 1861 /* XXX may action payload */ 1862 + sizeof(struct ieee80211_action_ba_addbaresponse) 1863 ); 1864 if (m == NULL) 1865 senderr(ENOMEM, is_tx_nobuf); 1866 1867 *frm++ = category; 1868 *frm++ = action; 1869 switch (category) { 1870 case IEEE80211_ACTION_CAT_BA: 1871 switch (action) { 1872 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1873 IEEE80211_NOTE(vap, 1874 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1875 "send ADDBA request: dialogtoken %d " 1876 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 1877 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 1878 args[2], args[3]); 1879 1880 *frm++ = args[0]; /* dialog token */ 1881 ADDSHORT(frm, args[1]); /* baparamset */ 1882 ADDSHORT(frm, args[2]); /* batimeout */ 1883 ADDSHORT(frm, args[3]); /* baseqctl */ 1884 break; 1885 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1886 IEEE80211_NOTE(vap, 1887 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1888 "send ADDBA response: dialogtoken %d status %d " 1889 "baparamset 0x%x (tid %d) batimeout %d", 1890 args[0], args[1], args[2], 1891 MS(args[2], IEEE80211_BAPS_TID), args[3]); 1892 1893 *frm++ = args[0]; /* dialog token */ 1894 ADDSHORT(frm, args[1]); /* statuscode */ 1895 ADDSHORT(frm, args[2]); /* baparamset */ 1896 ADDSHORT(frm, args[3]); /* batimeout */ 1897 break; 1898 case IEEE80211_ACTION_BA_DELBA: 1899 /* XXX */ 1900 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 1901 | args[1] 1902 ; 1903 ADDSHORT(frm, baparamset); 1904 ADDSHORT(frm, args[2]); /* reason code */ 1905 1906 IEEE80211_NOTE(vap, 1907 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1908 "send DELBA action: tid %d, initiator %d reason %d", 1909 args[0], args[1], args[2]); 1910 break; 1911 default: 1912 goto badaction; 1913 } 1914 break; 1915 case IEEE80211_ACTION_CAT_HT: 1916 switch (action) { 1917 case IEEE80211_ACTION_HT_TXCHWIDTH: 1918 IEEE80211_NOTE(vap, 1919 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1920 ni, "send HT txchwidth: width %d", 1921 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20 1922 ); 1923 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 1924 IEEE80211_A_HT_TXCHWIDTH_2040 : 1925 IEEE80211_A_HT_TXCHWIDTH_20; 1926 break; 1927 default: 1928 goto badaction; 1929 } 1930 break; 1931 default: 1932 badaction: 1933 IEEE80211_NOTE(vap, 1934 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1935 "%s: unsupported category %d action %d", __func__, 1936 category, action); 1937 senderr(EINVAL, is_tx_unknownmgt); 1938 /* NOTREACHED */ 1939 } 1940 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1941 1942 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION); 1943 bad: 1944 ieee80211_free_node(ni); 1945 if (m != NULL) 1946 m_freem(m); 1947 return ret; 1948 #undef ADDSHORT 1949 #undef senderr 1950 } 1951 1952 /* 1953 * Construct the MCS bit mask for inclusion 1954 * in an HT information element. 1955 */ 1956 static void 1957 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1958 { 1959 int i; 1960 1961 for (i = 0; i < rs->rs_nrates; i++) { 1962 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1963 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 1964 /* NB: this assumes a particular implementation */ 1965 setbit(frm, r); 1966 } 1967 } 1968 } 1969 1970 /* 1971 * Add body of an HTCAP information element. 1972 */ 1973 static uint8_t * 1974 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 1975 { 1976 #define ADDSHORT(frm, v) do { \ 1977 frm[0] = (v) & 0xff; \ 1978 frm[1] = (v) >> 8; \ 1979 frm += 2; \ 1980 } while (0) 1981 struct ieee80211vap *vap = ni->ni_vap; 1982 uint16_t caps; 1983 int rxmax, density; 1984 1985 /* HT capabilities */ 1986 caps = vap->iv_htcaps & 0xffff; 1987 /* 1988 * Note channel width depends on whether we are operating as 1989 * a sta or not. When operating as a sta we are generating 1990 * a request based on our desired configuration. Otherwise 1991 * we are operational and the channel attributes identify 1992 * how we've been setup (which might be different if a fixed 1993 * channel is specified). 1994 */ 1995 if (vap->iv_opmode == IEEE80211_M_STA) { 1996 /* override 20/40 use based on config */ 1997 if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) 1998 caps |= IEEE80211_HTCAP_CHWIDTH40; 1999 else 2000 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2001 /* use advertised setting (XXX locally constraint) */ 2002 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 2003 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 2004 } else { 2005 /* override 20/40 use based on current channel */ 2006 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2007 caps |= IEEE80211_HTCAP_CHWIDTH40; 2008 else 2009 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2010 rxmax = vap->iv_ampdu_rxmax; 2011 density = vap->iv_ampdu_density; 2012 } 2013 /* adjust short GI based on channel and config */ 2014 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 2015 caps &= ~IEEE80211_HTCAP_SHORTGI20; 2016 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 2017 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 2018 caps &= ~IEEE80211_HTCAP_SHORTGI40; 2019 ADDSHORT(frm, caps); 2020 2021 /* HT parameters */ 2022 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 2023 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 2024 ; 2025 frm++; 2026 2027 /* pre-zero remainder of ie */ 2028 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 2029 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 2030 2031 /* supported MCS set */ 2032 /* 2033 * XXX it would better to get the rate set from ni_htrates 2034 * so we can restrict it but for sta mode ni_htrates isn't 2035 * setup when we're called to form an AssocReq frame so for 2036 * now we're restricted to the default HT rate set. 2037 */ 2038 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 2039 2040 frm += sizeof(struct ieee80211_ie_htcap) - 2041 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 2042 return frm; 2043 #undef ADDSHORT 2044 } 2045 2046 /* 2047 * Add 802.11n HT capabilities information element 2048 */ 2049 uint8_t * 2050 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2051 { 2052 frm[0] = IEEE80211_ELEMID_HTCAP; 2053 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2054 return ieee80211_add_htcap_body(frm + 2, ni); 2055 } 2056 2057 /* 2058 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2059 * used for compatibility w/ pre-draft implementations. 2060 */ 2061 uint8_t * 2062 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2063 { 2064 frm[0] = IEEE80211_ELEMID_VENDOR; 2065 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2066 frm[2] = (BCM_OUI >> 0) & 0xff; 2067 frm[3] = (BCM_OUI >> 8) & 0xff; 2068 frm[4] = (BCM_OUI >> 16) & 0xff; 2069 frm[5] = BCM_OUI_HTCAP; 2070 return ieee80211_add_htcap_body(frm + 6, ni); 2071 } 2072 2073 /* 2074 * Construct the MCS bit mask of basic rates 2075 * for inclusion in an HT information element. 2076 */ 2077 static void 2078 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2079 { 2080 int i; 2081 2082 for (i = 0; i < rs->rs_nrates; i++) { 2083 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2084 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2085 r < IEEE80211_HTRATE_MAXSIZE) { 2086 /* NB: this assumes a particular implementation */ 2087 setbit(frm, r); 2088 } 2089 } 2090 } 2091 2092 /* 2093 * Update the HTINFO ie for a beacon frame. 2094 */ 2095 void 2096 ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2097 struct ieee80211_beacon_offsets *bo) 2098 { 2099 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2100 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2101 struct ieee80211com *ic = vap->iv_ic; 2102 struct ieee80211_ie_htinfo *ht = 2103 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2104 2105 /* XXX only update on channel change */ 2106 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2107 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2108 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2109 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2110 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2111 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2112 else 2113 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2114 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2115 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2116 2117 /* protection mode */ 2118 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2119 2120 /* XXX propagate to vendor ie's */ 2121 #undef PROTMODE 2122 } 2123 2124 /* 2125 * Add body of an HTINFO information element. 2126 * 2127 * NB: We don't use struct ieee80211_ie_htinfo because we can 2128 * be called to fillin both a standard ie and a compat ie that 2129 * has a vendor OUI at the front. 2130 */ 2131 static uint8_t * 2132 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2133 { 2134 struct ieee80211com *ic = ni->ni_ic; 2135 2136 /* pre-zero remainder of ie */ 2137 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2138 2139 /* primary/control channel center */ 2140 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2141 2142 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2143 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2144 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2145 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2146 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2147 else 2148 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2149 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2150 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2151 2152 frm[1] = ic->ic_curhtprotmode; 2153 2154 frm += 5; 2155 2156 /* basic MCS set */ 2157 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2158 frm += sizeof(struct ieee80211_ie_htinfo) - 2159 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2160 return frm; 2161 } 2162 2163 /* 2164 * Add 802.11n HT information information element. 2165 */ 2166 uint8_t * 2167 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2168 { 2169 frm[0] = IEEE80211_ELEMID_HTINFO; 2170 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2171 return ieee80211_add_htinfo_body(frm + 2, ni); 2172 } 2173 2174 /* 2175 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2176 * used for compatibility w/ pre-draft implementations. 2177 */ 2178 uint8_t * 2179 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2180 { 2181 frm[0] = IEEE80211_ELEMID_VENDOR; 2182 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2183 frm[2] = (BCM_OUI >> 0) & 0xff; 2184 frm[3] = (BCM_OUI >> 8) & 0xff; 2185 frm[4] = (BCM_OUI >> 16) & 0xff; 2186 frm[5] = BCM_OUI_HTINFO; 2187 return ieee80211_add_htinfo_body(frm + 6, ni); 2188 } 2189