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 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; /* bypass normal processing */ 345 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU set */ 346 (void) ieee80211_input(ni, m, 0, 0, 0); 347 } 348 349 /* 350 * Dispatch as many frames as possible from the re-order queue. 351 * Frames will always be "at the front"; we process all frames 352 * up to the first empty slot in the window. On completion we 353 * cleanup state if there are still pending frames in the current 354 * BA window. We assume the frame at slot 0 is already handled 355 * by the caller; we always start at slot 1. 356 */ 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(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 521 522 /* NB: m_len known to be sufficient */ 523 wh = mtod(m, struct ieee80211_qosframe *); 524 KASSERT(wh->i_fc[0] == IEEE80211_FC0_QOSDATA, ("not QoS data")); 525 526 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 527 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 528 else 529 tid = wh->i_qos[0]; 530 tid &= IEEE80211_QOS_TID; 531 rap = &ni->ni_rx_ampdu[tid]; 532 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 533 /* 534 * No ADDBA request yet, don't touch. 535 */ 536 return PROCESS; 537 } 538 rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 539 rap->rxa_nframes++; 540 again: 541 if (rxseq == rap->rxa_start) { 542 /* 543 * First frame in window. 544 */ 545 if (rap->rxa_qframes != 0) { 546 /* 547 * Dispatch as many packets as we can. 548 */ 549 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 550 ampdu_dispatch(ni, m); 551 ampdu_rx_dispatch(rap, ni); 552 return CONSUMED; 553 } else { 554 /* 555 * In order; advance window and notify 556 * caller to dispatch directly. 557 */ 558 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 559 return PROCESS; 560 } 561 } 562 /* 563 * Frame is out of order; store if in the BA window. 564 */ 565 /* calculate offset in BA window */ 566 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 567 if (off < rap->rxa_wnd) { 568 /* 569 * Common case (hopefully): in the BA window. 570 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 571 */ 572 #ifdef IEEE80211_AMPDU_AGE 573 /* 574 * Check for frames sitting too long in the reorder queue. 575 * This should only ever happen if frames are not delivered 576 * without the sender otherwise notifying us (e.g. with a 577 * BAR to move the window). Typically this happens because 578 * of vendor bugs that cause the sequence number to jump. 579 * When this happens we get a gap in the reorder queue that 580 * leaves frame sitting on the queue until they get pushed 581 * out due to window moves. When the vendor does not send 582 * BAR this move only happens due to explicit packet sends 583 * 584 * NB: we only track the time of the oldest frame in the 585 * reorder q; this means that if we flush we might push 586 * frames that still "new"; if this happens then subsequent 587 * frames will result in BA window moves which cost something 588 * but is still better than a big throughput dip. 589 */ 590 if (rap->rxa_qframes != 0) { 591 /* XXX honor batimeout? */ 592 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 593 /* 594 * Too long since we received the first 595 * frame; flush the reorder buffer. 596 */ 597 if (rap->rxa_qframes != 0) { 598 vap->iv_stats.is_ampdu_rx_age += 599 rap->rxa_qframes; 600 ampdu_rx_flush(ni, rap); 601 } 602 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 603 return PROCESS; 604 } 605 } else { 606 /* 607 * First frame, start aging timer. 608 */ 609 rap->rxa_age = ticks; 610 } 611 #endif /* IEEE80211_AMPDU_AGE */ 612 /* save packet */ 613 if (rap->rxa_m[off] == NULL) { 614 rap->rxa_m[off] = m; 615 rap->rxa_qframes++; 616 rap->rxa_qbytes += m->m_pkthdr.len; 617 vap->iv_stats.is_ampdu_rx_reorder++; 618 } else { 619 IEEE80211_DISCARD_MAC(vap, 620 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 621 ni->ni_macaddr, "a-mpdu duplicate", 622 "seqno %u tid %u BA win <%u:%u>", 623 rxseq, tid, rap->rxa_start, 624 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 625 vap->iv_stats.is_rx_dup++; 626 IEEE80211_NODE_STAT(ni, rx_dup); 627 m_freem(m); 628 } 629 return CONSUMED; 630 } 631 if (off < IEEE80211_SEQ_BA_RANGE) { 632 /* 633 * Outside the BA window, but within range; 634 * flush the reorder q and move the window. 635 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 636 */ 637 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 638 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 639 rap->rxa_start, 640 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 641 rap->rxa_qframes, rxseq, tid); 642 vap->iv_stats.is_ampdu_rx_move++; 643 644 /* 645 * The spec says to flush frames up to but not including: 646 * WinStart_B = rxseq - rap->rxa_wnd + 1 647 * Then insert the frame or notify the caller to process 648 * it immediately. We can safely do this by just starting 649 * over again because we know the frame will now be within 650 * the BA window. 651 */ 652 /* NB: rxa_wnd known to be >0 */ 653 ampdu_rx_flush_upto(ni, rap, 654 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 655 goto again; 656 } else { 657 /* 658 * Outside the BA window and out of range; toss. 659 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 660 */ 661 IEEE80211_DISCARD_MAC(vap, 662 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 663 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 664 rap->rxa_start, 665 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 666 rap->rxa_qframes, rxseq, tid, 667 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 668 vap->iv_stats.is_ampdu_rx_drop++; 669 IEEE80211_NODE_STAT(ni, rx_drop); 670 m_freem(m); 671 return CONSUMED; 672 } 673 #undef CONSUMED 674 #undef PROCESS 675 #undef IEEE80211_FC0_QOSDATA 676 } 677 678 /* 679 * Process a BAR ctl frame. Dispatch all frames up to 680 * the sequence number of the frame. If this frame is 681 * out of range it's discarded. 682 */ 683 void 684 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 685 { 686 struct ieee80211vap *vap = ni->ni_vap; 687 struct ieee80211_frame_bar *wh; 688 struct ieee80211_rx_ampdu *rap; 689 ieee80211_seq rxseq; 690 int tid, off; 691 692 if (!ieee80211_recv_bar_ena) { 693 #if 0 694 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 695 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 696 #endif 697 vap->iv_stats.is_ampdu_bar_bad++; 698 return; 699 } 700 wh = mtod(m0, struct ieee80211_frame_bar *); 701 /* XXX check basic BAR */ 702 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 703 rap = &ni->ni_rx_ampdu[tid]; 704 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 705 /* 706 * No ADDBA request yet, don't touch. 707 */ 708 IEEE80211_DISCARD_MAC(vap, 709 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 710 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 711 vap->iv_stats.is_ampdu_bar_bad++; 712 return; 713 } 714 vap->iv_stats.is_ampdu_bar_rx++; 715 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 716 if (rxseq == rap->rxa_start) 717 return; 718 /* calculate offset in BA window */ 719 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 720 if (off < IEEE80211_SEQ_BA_RANGE) { 721 /* 722 * Flush the reorder q up to rxseq and move the window. 723 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 724 */ 725 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 726 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 727 rap->rxa_start, 728 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 729 rap->rxa_qframes, rxseq, tid); 730 vap->iv_stats.is_ampdu_bar_move++; 731 732 ampdu_rx_flush_upto(ni, rap, rxseq); 733 if (off >= rap->rxa_wnd) { 734 /* 735 * BAR specifies a window start to the right of BA 736 * window; we must move it explicitly since 737 * ampdu_rx_flush_upto will not. 738 */ 739 rap->rxa_start = rxseq; 740 } 741 } else { 742 /* 743 * Out of range; toss. 744 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 745 */ 746 IEEE80211_DISCARD_MAC(vap, 747 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 748 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 749 rap->rxa_start, 750 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 751 rap->rxa_qframes, rxseq, tid, 752 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 753 vap->iv_stats.is_ampdu_bar_oow++; 754 IEEE80211_NODE_STAT(ni, rx_drop); 755 } 756 } 757 758 /* 759 * Setup HT-specific state in a node. Called only 760 * when HT use is negotiated so we don't do extra 761 * work for temporary and/or legacy sta's. 762 */ 763 void 764 ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap) 765 { 766 struct ieee80211_tx_ampdu *tap; 767 int ac; 768 769 if (ni->ni_flags & IEEE80211_NODE_HT) { 770 /* 771 * Clean AMPDU state on re-associate. This handles the case 772 * where a station leaves w/o notifying us and then returns 773 * before node is reaped for inactivity. 774 */ 775 ieee80211_ht_node_cleanup(ni); 776 } 777 ieee80211_parse_htcap(ni, htcap); 778 for (ac = 0; ac < WME_NUM_AC; ac++) { 779 tap = &ni->ni_tx_ampdu[ac]; 780 tap->txa_ac = ac; 781 /* NB: further initialization deferred */ 782 } 783 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 784 } 785 786 /* 787 * Cleanup HT-specific state in a node. Called only 788 * when HT use has been marked. 789 */ 790 void 791 ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 792 { 793 struct ieee80211com *ic = ni->ni_ic; 794 int i; 795 796 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 797 798 /* XXX optimize this */ 799 for (i = 0; i < WME_NUM_AC; i++) { 800 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 801 if (tap->txa_flags & IEEE80211_AGGR_SETUP) { 802 /* 803 * Stop BA stream if setup so driver has a chance 804 * to reclaim any resources it might have allocated. 805 */ 806 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]); 807 IEEE80211_TAPQ_DESTROY(tap); 808 tap->txa_lastsample = 0; 809 tap->txa_avgpps = 0; 810 /* NB: clearing NAK means we may re-send ADDBA */ 811 tap->txa_flags &= 812 ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 813 } 814 } 815 for (i = 0; i < WME_NUM_TID; i++) 816 ampdu_rx_stop(&ni->ni_rx_ampdu[i]); 817 818 ni->ni_htcap = 0; 819 ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT | 820 IEEE80211_NODE_AMPDU); 821 } 822 823 /* 824 * Age out HT resources for a station. 825 */ 826 void 827 ieee80211_ht_node_age(struct ieee80211_node *ni) 828 { 829 #ifdef IEEE80211_AMPDU_AGE 830 struct ieee80211vap *vap = ni->ni_vap; 831 uint8_t tid; 832 #endif 833 834 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 835 836 #ifdef IEEE80211_AMPDU_AGE 837 for (tid = 0; tid < WME_NUM_TID; tid++) { 838 struct ieee80211_rx_ampdu *rap; 839 840 rap = &ni->ni_rx_ampdu[tid]; 841 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 842 continue; 843 if (rap->rxa_qframes == 0) 844 continue; 845 /* 846 * Check for frames sitting too long in the reorder queue. 847 * See above for more details on what's happening here. 848 */ 849 /* XXX honor batimeout? */ 850 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 851 /* 852 * Too long since we received the first 853 * frame; flush the reorder buffer. 854 */ 855 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 856 ampdu_rx_flush(ni, rap); 857 } 858 } 859 #endif /* IEEE80211_AMPDU_AGE */ 860 } 861 862 static struct ieee80211_channel * 863 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 864 { 865 return ieee80211_find_channel(ic, c->ic_freq, 866 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 867 } 868 869 /* 870 * Adjust a channel to be HT/non-HT according to the vap's configuration. 871 */ 872 struct ieee80211_channel * 873 ieee80211_ht_adjust_channel(struct ieee80211com *ic, 874 struct ieee80211_channel *chan, int flags) 875 { 876 struct ieee80211_channel *c; 877 878 if (flags & IEEE80211_FEXT_HT) { 879 /* promote to HT if possible */ 880 if (flags & IEEE80211_FEXT_USEHT40) { 881 if (!IEEE80211_IS_CHAN_HT40(chan)) { 882 /* NB: arbitrarily pick ht40+ over ht40- */ 883 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 884 if (c == NULL) 885 c = findhtchan(ic, chan, 886 IEEE80211_CHAN_HT40D); 887 if (c == NULL) 888 c = findhtchan(ic, chan, 889 IEEE80211_CHAN_HT20); 890 if (c != NULL) 891 chan = c; 892 } 893 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 894 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 895 if (c != NULL) 896 chan = c; 897 } 898 } else if (IEEE80211_IS_CHAN_HT(chan)) { 899 /* demote to legacy, HT use is disabled */ 900 c = ieee80211_find_channel(ic, chan->ic_freq, 901 chan->ic_flags &~ IEEE80211_CHAN_HT); 902 if (c != NULL) 903 chan = c; 904 } 905 return chan; 906 } 907 908 /* 909 * Setup HT-specific state for a legacy WDS peer. 910 */ 911 void 912 ieee80211_ht_wds_init(struct ieee80211_node *ni) 913 { 914 struct ieee80211vap *vap = ni->ni_vap; 915 struct ieee80211_tx_ampdu *tap; 916 int ac; 917 918 KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested")); 919 920 /* XXX check scan cache in case peer has an ap and we have info */ 921 /* 922 * If setup with a legacy channel; locate an HT channel. 923 * Otherwise if the inherited channel (from a companion 924 * AP) is suitable use it so we use the same location 925 * for the extension channel). 926 */ 927 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 928 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 929 930 ni->ni_htcap = 0; 931 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) 932 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 933 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 934 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 935 ni->ni_chw = 40; 936 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 937 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 938 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 939 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 940 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) 941 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 942 } else { 943 ni->ni_chw = 20; 944 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 945 } 946 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 947 948 ni->ni_htopmode = 0; /* XXX need protection state */ 949 ni->ni_htstbc = 0; /* XXX need info */ 950 951 for (ac = 0; ac < WME_NUM_AC; ac++) { 952 tap = &ni->ni_tx_ampdu[ac]; 953 tap->txa_ac = ac; 954 } 955 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */ 956 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 957 } 958 959 /* 960 * Notify hostap vaps of a change in the HTINFO ie. 961 */ 962 static void 963 htinfo_notify(struct ieee80211com *ic) 964 { 965 struct ieee80211vap *vap; 966 int first = 1; 967 968 IEEE80211_LOCK_ASSERT(ic); 969 970 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 971 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 972 continue; 973 if (first) { 974 IEEE80211_NOTE(vap, 975 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 976 vap->iv_bss, 977 "HT bss occupancy change: %d sta, %d ht, " 978 "%d ht40%s, HT protmode now 0x%x" 979 , ic->ic_sta_assoc 980 , ic->ic_ht_sta_assoc 981 , ic->ic_ht40_sta_assoc 982 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ? 983 ", non-HT sta present" : "" 984 , ic->ic_curhtprotmode); 985 first = 0; 986 } 987 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 988 } 989 } 990 991 /* 992 * Calculate HT protection mode from current 993 * state and handle updates. 994 */ 995 static void 996 htinfo_update(struct ieee80211com *ic) 997 { 998 uint8_t protmode; 999 1000 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1001 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1002 | IEEE80211_HTINFO_NONHT_PRESENT; 1003 } else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) { 1004 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1005 | IEEE80211_HTINFO_NONHT_PRESENT; 1006 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1007 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1008 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1009 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1010 } else { 1011 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1012 } 1013 if (protmode != ic->ic_curhtprotmode) { 1014 ic->ic_curhtprotmode = protmode; 1015 htinfo_notify(ic); 1016 } 1017 } 1018 1019 /* 1020 * Handle an HT station joining a BSS. 1021 */ 1022 void 1023 ieee80211_ht_node_join(struct ieee80211_node *ni) 1024 { 1025 struct ieee80211com *ic = ni->ni_ic; 1026 1027 IEEE80211_LOCK_ASSERT(ic); 1028 1029 if (ni->ni_flags & IEEE80211_NODE_HT) { 1030 ic->ic_ht_sta_assoc++; 1031 if (ni->ni_chw == 40) 1032 ic->ic_ht40_sta_assoc++; 1033 } 1034 htinfo_update(ic); 1035 } 1036 1037 /* 1038 * Handle an HT station leaving a BSS. 1039 */ 1040 void 1041 ieee80211_ht_node_leave(struct ieee80211_node *ni) 1042 { 1043 struct ieee80211com *ic = ni->ni_ic; 1044 1045 IEEE80211_LOCK_ASSERT(ic); 1046 1047 if (ni->ni_flags & IEEE80211_NODE_HT) { 1048 ic->ic_ht_sta_assoc--; 1049 if (ni->ni_chw == 40) 1050 ic->ic_ht40_sta_assoc--; 1051 } 1052 htinfo_update(ic); 1053 } 1054 1055 /* 1056 * Public version of htinfo_update; used for processing 1057 * beacon frames from overlapping bss. 1058 * 1059 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1060 * (on receipt of a beacon that advertises MIXED) or 1061 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1062 * from an overlapping legacy bss). We treat MIXED with 1063 * a higher precedence than PROTOPT (i.e. we will not change 1064 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1065 * corresponds to how we handle things in htinfo_update. 1066 */ 1067 void 1068 ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1069 { 1070 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1071 if (protmode == ic->ic_curhtprotmode) 1072 return; 1073 if (OPMODE(ic->ic_curhtprotmode) == IEEE80211_HTINFO_OPMODE_MIXED && 1074 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT) 1075 return; 1076 1077 IEEE80211_LOCK(ic); 1078 /* track non-HT station presence */ 1079 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1080 ("missing NONHT_PRESENT")); 1081 ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR; 1082 ic->ic_lastnonht = ticks; 1083 1084 /* push beacon update */ 1085 ic->ic_curhtprotmode = protmode; 1086 htinfo_notify(ic); 1087 IEEE80211_UNLOCK(ic); 1088 #undef OPMODE 1089 } 1090 1091 /* 1092 * Time out presence of an overlapping bss with non-HT 1093 * stations. When operating in hostap mode we listen for 1094 * beacons from other stations and if we identify a non-HT 1095 * station is present we update the opmode field of the 1096 * HTINFO ie. To identify when all non-HT stations are 1097 * gone we time out this condition. 1098 */ 1099 void 1100 ieee80211_ht_timeout(struct ieee80211com *ic) 1101 { 1102 IEEE80211_LOCK_ASSERT(ic); 1103 1104 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) && 1105 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1106 #if 0 1107 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1108 "%s", "time out non-HT STA present on channel"); 1109 #endif 1110 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 1111 htinfo_update(ic); 1112 } 1113 } 1114 1115 /* unalligned little endian access */ 1116 #define LE_READ_2(p) \ 1117 ((uint16_t) \ 1118 ((((const uint8_t *)(p))[0] ) | \ 1119 (((const uint8_t *)(p))[1] << 8))) 1120 1121 /* 1122 * Process an 802.11n HT capabilities ie. 1123 */ 1124 void 1125 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1126 { 1127 struct ieee80211vap *vap = ni->ni_vap; 1128 1129 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1130 /* 1131 * Station used Vendor OUI ie to associate; 1132 * mark the node so when we respond we'll use 1133 * the Vendor OUI's and not the standard ie's. 1134 */ 1135 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1136 ie += 4; 1137 } else 1138 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1139 1140 ni->ni_htcap = LE_READ_2(ie + 1141 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1142 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1143 /* XXX needed or will ieee80211_parse_htinfo always be called? */ 1144 ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1145 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20; 1146 } 1147 1148 /* 1149 * Process an 802.11n HT info ie and update the node state. 1150 * Note that we handle use this information to identify the 1151 * correct channel (HT20, HT40+, HT40-, legacy). The caller 1152 * is responsible for insuring any required channel change is 1153 * done (e.g. in sta mode when parsing the contents of a 1154 * beacon frame). 1155 */ 1156 void 1157 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1158 { 1159 struct ieee80211com *ic = ni->ni_ic; 1160 struct ieee80211vap *vap = ni->ni_vap; 1161 const struct ieee80211_ie_htinfo *htinfo; 1162 struct ieee80211_channel *c; 1163 uint16_t w; 1164 int htflags, chanflags; 1165 1166 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1167 ie += 4; 1168 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1169 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1170 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1171 w = LE_READ_2(&htinfo->hi_byte2); 1172 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1173 w = LE_READ_2(&htinfo->hi_byte45); 1174 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1175 /* 1176 * Handle 11n channel switch. Use the received HT ie's to 1177 * identify the right channel to use. If we cannot locate it 1178 * in the channel table then fallback to legacy operation. 1179 */ 1180 /* NB: honor operating mode constraint */ 1181 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1182 IEEE80211_CHAN_HT20 : 0; 1183 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1184 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1185 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1186 htflags = IEEE80211_CHAN_HT40U; 1187 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1188 htflags = IEEE80211_CHAN_HT40D; 1189 } 1190 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1191 if (chanflags != ni->ni_chan->ic_flags) { 1192 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1193 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1194 /* 1195 * No HT40 channel entry in our table; fall back 1196 * to HT20 operation. This should not happen. 1197 */ 1198 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1199 IEEE80211_NOTE(vap, 1200 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1201 "no HT40 channel (freq %u), falling back to HT20", 1202 ni->ni_chan->ic_freq); 1203 /* XXX stat */ 1204 } 1205 if (c != NULL && c != ni->ni_chan) { 1206 IEEE80211_NOTE(vap, 1207 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1208 "switch station to HT%d channel %u/0x%x", 1209 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1210 c->ic_freq, c->ic_flags); 1211 ni->ni_chan = c; 1212 } 1213 /* NB: caller responsible for forcing any channel change */ 1214 } 1215 /* update node's tx channel width */ 1216 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1217 } 1218 1219 /* 1220 * Install received HT rate set by parsing the HT cap ie. 1221 */ 1222 int 1223 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1224 { 1225 struct ieee80211vap *vap = ni->ni_vap; 1226 const struct ieee80211_ie_htcap *htcap; 1227 struct ieee80211_htrateset *rs; 1228 int i; 1229 1230 rs = &ni->ni_htrates; 1231 memset(rs, 0, sizeof(*rs)); 1232 if (ie != NULL) { 1233 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1234 ie += 4; 1235 htcap = (const struct ieee80211_ie_htcap *) ie; 1236 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1237 if (isclr(htcap->hc_mcsset, i)) 1238 continue; 1239 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1240 IEEE80211_NOTE(vap, 1241 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1242 "WARNING, HT rate set too large; only " 1243 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1244 vap->iv_stats.is_rx_rstoobig++; 1245 break; 1246 } 1247 rs->rs_rates[rs->rs_nrates++] = i; 1248 } 1249 } 1250 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1251 } 1252 1253 /* 1254 * Mark rates in a node's HT rate set as basic according 1255 * to the information in the supplied HT info ie. 1256 */ 1257 void 1258 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1259 { 1260 const struct ieee80211_ie_htinfo *htinfo; 1261 struct ieee80211_htrateset *rs; 1262 int i, j; 1263 1264 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1265 ie += 4; 1266 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1267 rs = &ni->ni_htrates; 1268 if (rs->rs_nrates == 0) { 1269 IEEE80211_NOTE(ni->ni_vap, 1270 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1271 "%s", "WARNING, empty HT rate set"); 1272 return; 1273 } 1274 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1275 if (isclr(htinfo->hi_basicmcsset, i)) 1276 continue; 1277 for (j = 0; j < rs->rs_nrates; j++) 1278 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1279 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1280 } 1281 } 1282 1283 static void 1284 addba_timeout(void *arg) 1285 { 1286 struct ieee80211_tx_ampdu *tap = arg; 1287 1288 /* XXX ? */ 1289 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1290 tap->txa_attempts++; 1291 } 1292 1293 static void 1294 addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1295 { 1296 /* XXX use CALLOUT_PENDING instead? */ 1297 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1298 addba_timeout, tap); 1299 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1300 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1301 } 1302 1303 static void 1304 addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1305 { 1306 /* XXX use CALLOUT_PENDING instead? */ 1307 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1308 callout_stop(&tap->txa_timer); 1309 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1310 } 1311 } 1312 1313 /* 1314 * Default method for requesting A-MPDU tx aggregation. 1315 * We setup the specified state block and start a timer 1316 * to wait for an ADDBA response frame. 1317 */ 1318 static int 1319 ieee80211_addba_request(struct ieee80211_node *ni, 1320 struct ieee80211_tx_ampdu *tap, 1321 int dialogtoken, int baparamset, int batimeout) 1322 { 1323 int bufsiz; 1324 1325 /* XXX locking */ 1326 tap->txa_token = dialogtoken; 1327 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1328 tap->txa_start = tap->txa_seqstart = 0; 1329 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1330 tap->txa_wnd = (bufsiz == 0) ? 1331 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1332 addba_start_timeout(tap); 1333 return 1; 1334 } 1335 1336 /* 1337 * Default method for processing an A-MPDU tx aggregation 1338 * response. We shutdown any pending timer and update the 1339 * state block according to the reply. 1340 */ 1341 static int 1342 ieee80211_addba_response(struct ieee80211_node *ni, 1343 struct ieee80211_tx_ampdu *tap, 1344 int status, int baparamset, int batimeout) 1345 { 1346 int bufsiz; 1347 1348 /* XXX locking */ 1349 addba_stop_timeout(tap); 1350 if (status == IEEE80211_STATUS_SUCCESS) { 1351 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1352 /* XXX override our request? */ 1353 tap->txa_wnd = (bufsiz == 0) ? 1354 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1355 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1356 } else { 1357 /* mark tid so we don't try again */ 1358 tap->txa_flags |= IEEE80211_AGGR_NAK; 1359 } 1360 return 1; 1361 } 1362 1363 /* 1364 * Default method for stopping A-MPDU tx aggregation. 1365 * Any timer is cleared and we drain any pending frames. 1366 */ 1367 static void 1368 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1369 { 1370 /* XXX locking */ 1371 addba_stop_timeout(tap); 1372 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1373 /* clear aggregation queue */ 1374 ieee80211_drain_ifq(&tap->txa_q); 1375 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1376 } 1377 tap->txa_attempts = 0; 1378 } 1379 1380 /* 1381 * Process a received action frame using the default aggregation 1382 * policy. We intercept ADDBA-related frames and use them to 1383 * update our aggregation state. All other frames are passed up 1384 * for processing by ieee80211_recv_action. 1385 */ 1386 static void 1387 ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1388 const uint8_t *frm, const uint8_t *efrm) 1389 { 1390 struct ieee80211com *ic = ni->ni_ic; 1391 struct ieee80211vap *vap = ni->ni_vap; 1392 const struct ieee80211_action *ia; 1393 struct ieee80211_rx_ampdu *rap; 1394 struct ieee80211_tx_ampdu *tap; 1395 uint8_t dialogtoken; 1396 uint16_t baparamset, batimeout, baseqctl, code; 1397 uint16_t args[4]; 1398 int tid, ac, bufsiz; 1399 1400 ia = (const struct ieee80211_action *) frm; 1401 switch (ia->ia_category) { 1402 case IEEE80211_ACTION_CAT_BA: 1403 switch (ia->ia_action) { 1404 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1405 dialogtoken = frm[2]; 1406 baparamset = LE_READ_2(frm+3); 1407 batimeout = LE_READ_2(frm+5); 1408 baseqctl = LE_READ_2(frm+7); 1409 1410 tid = MS(baparamset, IEEE80211_BAPS_TID); 1411 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1412 1413 IEEE80211_NOTE(vap, 1414 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1415 "recv ADDBA request: dialogtoken %u " 1416 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1417 "baseqctl %d:%d", 1418 dialogtoken, baparamset, tid, bufsiz, batimeout, 1419 MS(baseqctl, IEEE80211_BASEQ_START), 1420 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1421 1422 rap = &ni->ni_rx_ampdu[tid]; 1423 1424 /* Send ADDBA response */ 1425 args[0] = dialogtoken; 1426 /* 1427 * NB: We ack only if the sta associated with HT and 1428 * the ap is configured to do AMPDU rx (the latter 1429 * violates the 11n spec and is mostly for testing). 1430 */ 1431 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1432 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) { 1433 ampdu_rx_start(rap, bufsiz, 1434 MS(baseqctl, IEEE80211_BASEQ_START)); 1435 1436 args[1] = IEEE80211_STATUS_SUCCESS; 1437 } else { 1438 IEEE80211_NOTE(vap, 1439 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1440 ni, "reject ADDBA request: %s", 1441 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1442 "administratively disabled" : 1443 "not negotiated for station"); 1444 vap->iv_stats.is_addba_reject++; 1445 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1446 } 1447 /* XXX honor rap flags? */ 1448 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1449 | SM(tid, IEEE80211_BAPS_TID) 1450 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1451 ; 1452 args[3] = 0; 1453 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1454 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1455 return; 1456 1457 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1458 dialogtoken = frm[2]; 1459 code = LE_READ_2(frm+3); 1460 baparamset = LE_READ_2(frm+5); 1461 tid = MS(baparamset, IEEE80211_BAPS_TID); 1462 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1463 batimeout = LE_READ_2(frm+7); 1464 1465 ac = TID_TO_WME_AC(tid); 1466 tap = &ni->ni_tx_ampdu[ac]; 1467 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1468 IEEE80211_DISCARD_MAC(vap, 1469 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1470 ni->ni_macaddr, "ADDBA response", 1471 "no pending ADDBA, tid %d dialogtoken %u " 1472 "code %d", tid, dialogtoken, code); 1473 vap->iv_stats.is_addba_norequest++; 1474 return; 1475 } 1476 if (dialogtoken != tap->txa_token) { 1477 IEEE80211_DISCARD_MAC(vap, 1478 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1479 ni->ni_macaddr, "ADDBA response", 1480 "dialogtoken mismatch: waiting for %d, " 1481 "received %d, tid %d code %d", 1482 tap->txa_token, dialogtoken, tid, code); 1483 vap->iv_stats.is_addba_badtoken++; 1484 return; 1485 } 1486 1487 IEEE80211_NOTE(vap, 1488 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1489 "recv ADDBA response: dialogtoken %u code %d " 1490 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1491 dialogtoken, code, baparamset, tid, bufsiz, 1492 batimeout); 1493 ic->ic_addba_response(ni, tap, 1494 code, baparamset, batimeout); 1495 return; 1496 1497 case IEEE80211_ACTION_BA_DELBA: 1498 baparamset = LE_READ_2(frm+2); 1499 code = LE_READ_2(frm+4); 1500 1501 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1502 1503 IEEE80211_NOTE(vap, 1504 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1505 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1506 "code %d", baparamset, tid, 1507 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1508 1509 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1510 ac = TID_TO_WME_AC(tid); 1511 tap = &ni->ni_tx_ampdu[ac]; 1512 ic->ic_addba_stop(ni, tap); 1513 } else { 1514 rap = &ni->ni_rx_ampdu[tid]; 1515 ampdu_rx_stop(rap); 1516 } 1517 return; 1518 } 1519 break; 1520 } 1521 ieee80211_recv_action(ni, frm, efrm); 1522 } 1523 1524 /* 1525 * Process a received 802.11n action frame. 1526 * Aggregation-related frames are assumed to be handled 1527 * already; we handle any other frames we can, otherwise 1528 * complain about being unsupported (with debugging). 1529 */ 1530 void 1531 ieee80211_recv_action(struct ieee80211_node *ni, 1532 const uint8_t *frm, const uint8_t *efrm) 1533 { 1534 struct ieee80211vap *vap = ni->ni_vap; 1535 const struct ieee80211_action *ia; 1536 int chw; 1537 1538 ia = (const struct ieee80211_action *) frm; 1539 switch (ia->ia_category) { 1540 case IEEE80211_ACTION_CAT_BA: 1541 IEEE80211_NOTE(vap, 1542 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1543 "%s: BA action %d not implemented", __func__, 1544 ia->ia_action); 1545 vap->iv_stats.is_rx_mgtdiscard++; 1546 break; 1547 case IEEE80211_ACTION_CAT_HT: 1548 switch (ia->ia_action) { 1549 case IEEE80211_ACTION_HT_TXCHWIDTH: 1550 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1551 if (chw != ni->ni_chw) { 1552 ni->ni_chw = chw; 1553 ni->ni_flags |= IEEE80211_NODE_CHWUPDATE; 1554 } 1555 IEEE80211_NOTE(vap, 1556 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1557 "%s: HT txchwidth, width %d (%s)", 1558 __func__, chw, 1559 ni->ni_flags & IEEE80211_NODE_CHWUPDATE ? 1560 "new" : "no change"); 1561 break; 1562 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 1563 IEEE80211_NOTE(vap, 1564 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1565 "%s: HT MIMO PS", __func__); 1566 break; 1567 default: 1568 IEEE80211_NOTE(vap, 1569 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1570 "%s: HT action %d not implemented", __func__, 1571 ia->ia_action); 1572 vap->iv_stats.is_rx_mgtdiscard++; 1573 break; 1574 } 1575 break; 1576 default: 1577 IEEE80211_NOTE(vap, 1578 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1579 "%s: category %d not implemented", __func__, 1580 ia->ia_category); 1581 vap->iv_stats.is_rx_mgtdiscard++; 1582 break; 1583 } 1584 } 1585 1586 /* 1587 * Transmit processing. 1588 */ 1589 1590 /* 1591 * Check if A-MPDU should be requested/enabled for a stream. 1592 * We require a traffic rate above a per-AC threshold and we 1593 * also handle backoff from previous failed attempts. 1594 * 1595 * Drivers may override this method to bring in information 1596 * such as link state conditions in making the decision. 1597 */ 1598 static int 1599 ieee80211_ampdu_enable(struct ieee80211_node *ni, 1600 struct ieee80211_tx_ampdu *tap) 1601 { 1602 struct ieee80211vap *vap = ni->ni_vap; 1603 1604 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1605 return 0; 1606 /* XXX check rssi? */ 1607 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1608 ticks < tap->txa_nextrequest) { 1609 /* 1610 * Don't retry too often; txa_nextrequest is set 1611 * to the minimum interval we'll retry after 1612 * ieee80211_addba_maxtries failed attempts are made. 1613 */ 1614 return 0; 1615 } 1616 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1617 "%s: enable AMPDU on %s, avgpps %d pkts %d", 1618 __func__, ieee80211_wme_acnames[tap->txa_ac], 1619 tap->txa_avgpps, tap->txa_pkts); 1620 return 1; 1621 } 1622 1623 /* 1624 * Request A-MPDU tx aggregation. Setup local state and 1625 * issue an ADDBA request. BA use will only happen after 1626 * the other end replies with ADDBA response. 1627 */ 1628 int 1629 ieee80211_ampdu_request(struct ieee80211_node *ni, 1630 struct ieee80211_tx_ampdu *tap) 1631 { 1632 struct ieee80211com *ic = ni->ni_ic; 1633 uint16_t args[4]; 1634 int tid, dialogtoken; 1635 static int tokens = 0; /* XXX */ 1636 1637 /* XXX locking */ 1638 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1639 /* do deferred setup of state */ 1640 IEEE80211_TAPQ_INIT(tap); 1641 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1642 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1643 } 1644 /* XXX hack for not doing proper locking */ 1645 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1646 1647 dialogtoken = (tokens+1) % 63; /* XXX */ 1648 1649 tid = WME_AC_TO_TID(tap->txa_ac); 1650 args[0] = dialogtoken; 1651 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1652 | SM(tid, IEEE80211_BAPS_TID) 1653 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1654 ; 1655 args[2] = 0; /* batimeout */ 1656 /* NB: do first so there's no race against reply */ 1657 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1658 /* unable to setup state, don't make request */ 1659 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1660 ni, "%s: could not setup BA stream for AC %d", 1661 __func__, tap->txa_ac); 1662 /* defer next try so we don't slam the driver with requests */ 1663 tap->txa_attempts = ieee80211_addba_maxtries; 1664 /* NB: check in case driver wants to override */ 1665 if (tap->txa_nextrequest <= ticks) 1666 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 1667 return 0; 1668 } 1669 tokens = dialogtoken; /* allocate token */ 1670 /* NB: after calling ic_addba_request so driver can set seqstart */ 1671 args[3] = SM(tap->txa_seqstart, IEEE80211_BASEQ_START) 1672 | SM(0, IEEE80211_BASEQ_FRAG) 1673 ; 1674 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1675 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1676 } 1677 1678 /* 1679 * Terminate an AMPDU tx stream. State is reclaimed 1680 * and the peer notified with a DelBA Action frame. 1681 */ 1682 void 1683 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1684 { 1685 struct ieee80211com *ic = ni->ni_ic; 1686 struct ieee80211vap *vap = ni->ni_vap; 1687 uint16_t args[4]; 1688 1689 /* XXX locking */ 1690 if (IEEE80211_AMPDU_RUNNING(tap)) { 1691 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1692 ni, "%s: stop BA stream for AC %d", __func__, tap->txa_ac); 1693 vap->iv_stats.is_ampdu_stop++; 1694 1695 ic->ic_addba_stop(ni, tap); 1696 args[0] = WME_AC_TO_TID(tap->txa_ac); 1697 args[1] = IEEE80211_DELBAPS_INIT; 1698 args[2] = 1; /* XXX reason code */ 1699 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1700 IEEE80211_ACTION_BA_DELBA, args); 1701 } else { 1702 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1703 ni, "%s: BA stream for AC %d not running", 1704 __func__, tap->txa_ac); 1705 vap->iv_stats.is_ampdu_stop_failed++; 1706 } 1707 } 1708 1709 /* 1710 * Transmit a BAR frame to the specified node. The 1711 * BAR contents are drawn from the supplied aggregation 1712 * state associated with the node. 1713 */ 1714 int 1715 ieee80211_send_bar(struct ieee80211_node *ni, 1716 const struct ieee80211_tx_ampdu *tap) 1717 { 1718 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1719 #define ADDSHORT(frm, v) do { \ 1720 frm[0] = (v) & 0xff; \ 1721 frm[1] = (v) >> 8; \ 1722 frm += 2; \ 1723 } while (0) 1724 struct ieee80211vap *vap = ni->ni_vap; 1725 struct ieee80211com *ic = ni->ni_ic; 1726 struct ieee80211_frame_min *wh; 1727 struct mbuf *m; 1728 uint8_t *frm; 1729 uint16_t barctl, barseqctl; 1730 int tid, ret; 1731 1732 ieee80211_ref_node(ni); 1733 1734 m = ieee80211_getmgtframe(&frm, 1735 ic->ic_headroom + sizeof(struct ieee80211_frame_min), 1736 sizeof(struct ieee80211_ba_request) 1737 ); 1738 if (m == NULL) 1739 senderr(ENOMEM, is_tx_nobuf); 1740 1741 wh = mtod(m, struct ieee80211_frame_min *); 1742 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | 1743 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 1744 wh->i_fc[1] = 0; 1745 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1746 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1747 1748 tid = WME_AC_TO_TID(tap->txa_ac); 1749 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 1750 IEEE80211_BAPS_POLICY_IMMEDIATE : 1751 IEEE80211_BAPS_POLICY_DELAYED) 1752 | SM(tid, IEEE80211_BAPS_TID) 1753 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ) 1754 ; 1755 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START) 1756 | SM(0, IEEE80211_BASEQ_FRAG) 1757 ; 1758 ADDSHORT(frm, barctl); 1759 ADDSHORT(frm, barseqctl); 1760 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1761 1762 M_WME_SETAC(m, WME_AC_VO); 1763 1764 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 1765 1766 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1767 ni, "send bar frame (tid %u start %u) on channel %u", 1768 tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan)); 1769 1770 return ic->ic_raw_xmit(ni, m, NULL); 1771 bad: 1772 ieee80211_free_node(ni); 1773 return ret; 1774 #undef ADDSHORT 1775 #undef senderr 1776 } 1777 1778 /* 1779 * Send an action management frame. The arguments are stuff 1780 * into a frame without inspection; the caller is assumed to 1781 * prepare them carefully (e.g. based on the aggregation state). 1782 */ 1783 int 1784 ieee80211_send_action(struct ieee80211_node *ni, 1785 int category, int action, uint16_t args[4]) 1786 { 1787 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1788 #define ADDSHORT(frm, v) do { \ 1789 frm[0] = (v) & 0xff; \ 1790 frm[1] = (v) >> 8; \ 1791 frm += 2; \ 1792 } while (0) 1793 struct ieee80211vap *vap = ni->ni_vap; 1794 struct ieee80211com *ic = ni->ni_ic; 1795 struct mbuf *m; 1796 uint8_t *frm; 1797 uint16_t baparamset; 1798 int ret; 1799 1800 KASSERT(ni != NULL, ("null node")); 1801 1802 /* 1803 * Hold a reference on the node so it doesn't go away until after 1804 * the xmit is complete all the way in the driver. On error we 1805 * will remove our reference. 1806 */ 1807 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1808 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1809 __func__, __LINE__, 1810 ni, ether_sprintf(ni->ni_macaddr), 1811 ieee80211_node_refcnt(ni)+1); 1812 ieee80211_ref_node(ni); 1813 1814 m = ieee80211_getmgtframe(&frm, 1815 ic->ic_headroom + sizeof(struct ieee80211_frame), 1816 sizeof(uint16_t) /* action+category */ 1817 /* XXX may action payload */ 1818 + sizeof(struct ieee80211_action_ba_addbaresponse) 1819 ); 1820 if (m == NULL) 1821 senderr(ENOMEM, is_tx_nobuf); 1822 1823 *frm++ = category; 1824 *frm++ = action; 1825 switch (category) { 1826 case IEEE80211_ACTION_CAT_BA: 1827 switch (action) { 1828 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1829 IEEE80211_NOTE(vap, 1830 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1831 "send ADDBA request: dialogtoken %d " 1832 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 1833 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 1834 args[2], args[3]); 1835 1836 *frm++ = args[0]; /* dialog token */ 1837 ADDSHORT(frm, args[1]); /* baparamset */ 1838 ADDSHORT(frm, args[2]); /* batimeout */ 1839 ADDSHORT(frm, args[3]); /* baseqctl */ 1840 break; 1841 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1842 IEEE80211_NOTE(vap, 1843 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1844 "send ADDBA response: dialogtoken %d status %d " 1845 "baparamset 0x%x (tid %d) batimeout %d", 1846 args[0], args[1], args[2], 1847 MS(args[2], IEEE80211_BAPS_TID), args[3]); 1848 1849 *frm++ = args[0]; /* dialog token */ 1850 ADDSHORT(frm, args[1]); /* statuscode */ 1851 ADDSHORT(frm, args[2]); /* baparamset */ 1852 ADDSHORT(frm, args[3]); /* batimeout */ 1853 break; 1854 case IEEE80211_ACTION_BA_DELBA: 1855 /* XXX */ 1856 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 1857 | args[1] 1858 ; 1859 ADDSHORT(frm, baparamset); 1860 ADDSHORT(frm, args[2]); /* reason code */ 1861 1862 IEEE80211_NOTE(vap, 1863 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1864 "send DELBA action: tid %d, initiator %d reason %d", 1865 args[0], args[1], args[2]); 1866 break; 1867 default: 1868 goto badaction; 1869 } 1870 break; 1871 case IEEE80211_ACTION_CAT_HT: 1872 switch (action) { 1873 case IEEE80211_ACTION_HT_TXCHWIDTH: 1874 IEEE80211_NOTE(vap, 1875 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1876 ni, "send HT txchwidth: width %d", 1877 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20 1878 ); 1879 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 1880 IEEE80211_A_HT_TXCHWIDTH_2040 : 1881 IEEE80211_A_HT_TXCHWIDTH_20; 1882 break; 1883 default: 1884 goto badaction; 1885 } 1886 break; 1887 default: 1888 badaction: 1889 IEEE80211_NOTE(vap, 1890 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1891 "%s: unsupported category %d action %d", __func__, 1892 category, action); 1893 senderr(EINVAL, is_tx_unknownmgt); 1894 /* NOTREACHED */ 1895 } 1896 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1897 1898 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION); 1899 bad: 1900 ieee80211_free_node(ni); 1901 if (m != NULL) 1902 m_freem(m); 1903 return ret; 1904 #undef ADDSHORT 1905 #undef senderr 1906 } 1907 1908 /* 1909 * Construct the MCS bit mask for inclusion 1910 * in an HT information element. 1911 */ 1912 static void 1913 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1914 { 1915 int i; 1916 1917 for (i = 0; i < rs->rs_nrates; i++) { 1918 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1919 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 1920 /* NB: this assumes a particular implementation */ 1921 setbit(frm, r); 1922 } 1923 } 1924 } 1925 1926 /* 1927 * Add body of an HTCAP information element. 1928 */ 1929 static uint8_t * 1930 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 1931 { 1932 #define ADDSHORT(frm, v) do { \ 1933 frm[0] = (v) & 0xff; \ 1934 frm[1] = (v) >> 8; \ 1935 frm += 2; \ 1936 } while (0) 1937 struct ieee80211vap *vap = ni->ni_vap; 1938 uint16_t caps; 1939 int rxmax, density; 1940 1941 /* HT capabilities */ 1942 caps = vap->iv_htcaps & 0xffff; 1943 /* 1944 * Note channel width depends on whether we are operating as 1945 * a sta or not. When operating as a sta we are generating 1946 * a request based on our desired configuration. Otherwise 1947 * we are operational and the channel attributes identify 1948 * how we've been setup (which might be different if a fixed 1949 * channel is specified). 1950 */ 1951 if (vap->iv_opmode == IEEE80211_M_STA) { 1952 /* override 20/40 use based on config */ 1953 if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) 1954 caps |= IEEE80211_HTCAP_CHWIDTH40; 1955 else 1956 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1957 /* use advertised setting (XXX locally constraint) */ 1958 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 1959 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 1960 } else { 1961 /* override 20/40 use based on current channel */ 1962 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 1963 caps |= IEEE80211_HTCAP_CHWIDTH40; 1964 else 1965 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1966 rxmax = vap->iv_ampdu_rxmax; 1967 density = vap->iv_ampdu_density; 1968 } 1969 /* adjust short GI based on channel and config */ 1970 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 1971 caps &= ~IEEE80211_HTCAP_SHORTGI20; 1972 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 1973 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 1974 caps &= ~IEEE80211_HTCAP_SHORTGI40; 1975 ADDSHORT(frm, caps); 1976 1977 /* HT parameters */ 1978 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 1979 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 1980 ; 1981 frm++; 1982 1983 /* pre-zero remainder of ie */ 1984 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 1985 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 1986 1987 /* supported MCS set */ 1988 /* 1989 * XXX it would better to get the rate set from ni_htrates 1990 * so we can restrict it but for sta mode ni_htrates isn't 1991 * setup when we're called to form an AssocReq frame so for 1992 * now we're restricted to the default HT rate set. 1993 */ 1994 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 1995 1996 frm += sizeof(struct ieee80211_ie_htcap) - 1997 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 1998 return frm; 1999 #undef ADDSHORT 2000 } 2001 2002 /* 2003 * Add 802.11n HT capabilities information element 2004 */ 2005 uint8_t * 2006 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2007 { 2008 frm[0] = IEEE80211_ELEMID_HTCAP; 2009 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2010 return ieee80211_add_htcap_body(frm + 2, ni); 2011 } 2012 2013 /* 2014 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2015 * used for compatibility w/ pre-draft implementations. 2016 */ 2017 uint8_t * 2018 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2019 { 2020 frm[0] = IEEE80211_ELEMID_VENDOR; 2021 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2022 frm[2] = (BCM_OUI >> 0) & 0xff; 2023 frm[3] = (BCM_OUI >> 8) & 0xff; 2024 frm[4] = (BCM_OUI >> 16) & 0xff; 2025 frm[5] = BCM_OUI_HTCAP; 2026 return ieee80211_add_htcap_body(frm + 6, ni); 2027 } 2028 2029 /* 2030 * Construct the MCS bit mask of basic rates 2031 * for inclusion in an HT information element. 2032 */ 2033 static void 2034 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2035 { 2036 int i; 2037 2038 for (i = 0; i < rs->rs_nrates; i++) { 2039 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2040 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2041 r < IEEE80211_HTRATE_MAXSIZE) { 2042 /* NB: this assumes a particular implementation */ 2043 setbit(frm, r); 2044 } 2045 } 2046 } 2047 2048 /* 2049 * Update the HTINFO ie for a beacon frame. 2050 */ 2051 void 2052 ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2053 struct ieee80211_beacon_offsets *bo) 2054 { 2055 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2056 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2057 struct ieee80211com *ic = vap->iv_ic; 2058 struct ieee80211_ie_htinfo *ht = 2059 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2060 2061 /* XXX only update on channel change */ 2062 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2063 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2064 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2065 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2066 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2067 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2068 else 2069 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2070 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2071 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2072 2073 /* protection mode */ 2074 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2075 2076 /* XXX propagate to vendor ie's */ 2077 #undef PROTMODE 2078 } 2079 2080 /* 2081 * Add body of an HTINFO information element. 2082 * 2083 * NB: We don't use struct ieee80211_ie_htinfo because we can 2084 * be called to fillin both a standard ie and a compat ie that 2085 * has a vendor OUI at the front. 2086 */ 2087 static uint8_t * 2088 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2089 { 2090 struct ieee80211com *ic = ni->ni_ic; 2091 2092 /* pre-zero remainder of ie */ 2093 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2094 2095 /* primary/control channel center */ 2096 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2097 2098 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2099 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2100 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2101 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2102 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2103 else 2104 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2105 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2106 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2107 2108 frm[1] = ic->ic_curhtprotmode; 2109 2110 frm += 5; 2111 2112 /* basic MCS set */ 2113 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2114 frm += sizeof(struct ieee80211_ie_htinfo) - 2115 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2116 return frm; 2117 } 2118 2119 /* 2120 * Add 802.11n HT information information element. 2121 */ 2122 uint8_t * 2123 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2124 { 2125 frm[0] = IEEE80211_ELEMID_HTINFO; 2126 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2127 return ieee80211_add_htinfo_body(frm + 2, ni); 2128 } 2129 2130 /* 2131 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2132 * used for compatibility w/ pre-draft implementations. 2133 */ 2134 uint8_t * 2135 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2136 { 2137 frm[0] = IEEE80211_ELEMID_VENDOR; 2138 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2139 frm[2] = (BCM_OUI >> 0) & 0xff; 2140 frm[3] = (BCM_OUI >> 8) & 0xff; 2141 frm[4] = (BCM_OUI >> 16) & 0xff; 2142 frm[5] = BCM_OUI_HTINFO; 2143 return ieee80211_add_htinfo_body(frm + 6, ni); 2144 } 2145