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 int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */ 90 int ieee80211_bar_maxtries = 50; /* max BAR requests before DELBA */ 91 92 /* 93 * Setup HT parameters that depends on the clock frequency. 94 */ 95 static void 96 ieee80211_ht_setup(void) 97 { 98 #ifdef IEEE80211_AMPDU_AGE 99 ieee80211_ampdu_age = msecs_to_ticks(500); 100 #endif 101 ieee80211_addba_timeout = msecs_to_ticks(250); 102 ieee80211_addba_backoff = msecs_to_ticks(10*1000); 103 ieee80211_bar_timeout = msecs_to_ticks(250); 104 } 105 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL); 106 107 static int ieee80211_ampdu_enable(struct ieee80211_node *ni, 108 struct ieee80211_tx_ampdu *tap); 109 static int ieee80211_addba_request(struct ieee80211_node *ni, 110 struct ieee80211_tx_ampdu *tap, 111 int dialogtoken, int baparamset, int batimeout); 112 static int ieee80211_addba_response(struct ieee80211_node *ni, 113 struct ieee80211_tx_ampdu *tap, 114 int code, int baparamset, int batimeout); 115 static void ieee80211_addba_stop(struct ieee80211_node *ni, 116 struct ieee80211_tx_ampdu *tap); 117 static void ieee80211_aggr_recv_action(struct ieee80211_node *ni, 118 const uint8_t *frm, const uint8_t *efrm); 119 static void ieee80211_bar_response(struct ieee80211_node *ni, 120 struct ieee80211_tx_ampdu *tap, int status); 121 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap); 122 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap); 123 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *, 124 int baparamset, int batimeout, int baseqctl); 125 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *); 126 127 void 128 ieee80211_ht_attach(struct ieee80211com *ic) 129 { 130 /* setup default aggregation policy */ 131 ic->ic_recv_action = ieee80211_aggr_recv_action; 132 ic->ic_send_action = ieee80211_send_action; 133 ic->ic_ampdu_enable = ieee80211_ampdu_enable; 134 ic->ic_addba_request = ieee80211_addba_request; 135 ic->ic_addba_response = ieee80211_addba_response; 136 ic->ic_addba_stop = ieee80211_addba_stop; 137 ic->ic_bar_response = ieee80211_bar_response; 138 ic->ic_ampdu_rx_start = ampdu_rx_start; 139 ic->ic_ampdu_rx_stop = ampdu_rx_stop; 140 141 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS; 142 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 143 } 144 145 void 146 ieee80211_ht_detach(struct ieee80211com *ic) 147 { 148 } 149 150 void 151 ieee80211_ht_vattach(struct ieee80211vap *vap) 152 { 153 154 /* driver can override defaults */ 155 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 156 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 157 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax; 158 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU; 159 /* tx aggregation traffic thresholds */ 160 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128; 161 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64; 162 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32; 163 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32; 164 165 if (vap->iv_htcaps & IEEE80211_HTC_HT) { 166 /* 167 * Device is HT capable; enable all HT-related 168 * facilities by default. 169 * XXX these choices may be too aggressive. 170 */ 171 vap->iv_flags_ext |= IEEE80211_FEXT_HT 172 | IEEE80211_FEXT_HTCOMPAT 173 ; 174 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20) 175 vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI20; 176 /* XXX infer from channel list? */ 177 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 178 vap->iv_flags_ext |= IEEE80211_FEXT_USEHT40; 179 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40) 180 vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI40; 181 } 182 /* enable RIFS if capable */ 183 if (vap->iv_htcaps & IEEE80211_HTC_RIFS) 184 vap->iv_flags_ext |= IEEE80211_FEXT_RIFS; 185 186 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 187 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_RX; 188 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU) 189 vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_TX; 190 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_RX; 191 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU) 192 vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_TX; 193 } 194 /* NB: disable default legacy WDS, too many issues right now */ 195 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) 196 vap->iv_flags_ext &= ~IEEE80211_FEXT_HT; 197 } 198 199 void 200 ieee80211_ht_vdetach(struct ieee80211vap *vap) 201 { 202 } 203 204 static void 205 ht_announce(struct ieee80211com *ic, int mode, 206 const struct ieee80211_htrateset *rs) 207 { 208 struct ifnet *ifp = ic->ic_ifp; 209 int i, rate, mword; 210 211 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]); 212 for (i = 0; i < rs->rs_nrates; i++) { 213 mword = ieee80211_rate2media(ic, 214 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode); 215 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 216 continue; 217 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns; 218 printf("%s%d%sMbps", (i != 0 ? " " : ""), 219 rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); 220 } 221 printf("\n"); 222 } 223 224 void 225 ieee80211_ht_announce(struct ieee80211com *ic) 226 { 227 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 228 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n); 229 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 230 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n); 231 } 232 233 const struct ieee80211_htrateset * 234 ieee80211_get_suphtrates(struct ieee80211com *ic, 235 const struct ieee80211_channel *c) 236 { 237 return &ieee80211_rateset_11n; 238 } 239 240 /* 241 * Receive processing. 242 */ 243 244 /* 245 * Decap the encapsulated A-MSDU frames and dispatch all but 246 * the last for delivery. The last frame is returned for 247 * delivery via the normal path. 248 */ 249 struct mbuf * 250 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 251 { 252 struct ieee80211vap *vap = ni->ni_vap; 253 int framelen; 254 struct mbuf *n; 255 256 /* discard 802.3 header inserted by ieee80211_decap */ 257 m_adj(m, sizeof(struct ether_header)); 258 259 vap->iv_stats.is_amsdu_decap++; 260 261 for (;;) { 262 /* 263 * Decap the first frame, bust it apart from the 264 * remainder and deliver. We leave the last frame 265 * delivery to the caller (for consistency with other 266 * code paths, could also do it here). 267 */ 268 m = ieee80211_decap1(m, &framelen); 269 if (m == NULL) { 270 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 271 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 272 vap->iv_stats.is_amsdu_tooshort++; 273 return NULL; 274 } 275 if (m->m_pkthdr.len == framelen) 276 break; 277 n = m_split(m, framelen, M_NOWAIT); 278 if (n == NULL) { 279 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 280 ni->ni_macaddr, "a-msdu", 281 "%s", "unable to split encapsulated frames"); 282 vap->iv_stats.is_amsdu_split++; 283 m_freem(m); /* NB: must reclaim */ 284 return NULL; 285 } 286 vap->iv_deliver_data(vap, ni, m); 287 288 /* 289 * Remove frame contents; each intermediate frame 290 * is required to be aligned to a 4-byte boundary. 291 */ 292 m = n; 293 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 294 } 295 return m; /* last delivered by caller */ 296 } 297 298 /* 299 * Purge all frames in the A-MPDU re-order queue. 300 */ 301 static void 302 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 303 { 304 struct mbuf *m; 305 int i; 306 307 for (i = 0; i < rap->rxa_wnd; i++) { 308 m = rap->rxa_m[i]; 309 if (m != NULL) { 310 rap->rxa_m[i] = NULL; 311 rap->rxa_qbytes -= m->m_pkthdr.len; 312 m_freem(m); 313 if (--rap->rxa_qframes == 0) 314 break; 315 } 316 } 317 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 318 ("lost %u data, %u frames on ampdu rx q", 319 rap->rxa_qbytes, rap->rxa_qframes)); 320 } 321 322 /* 323 * Start A-MPDU rx/re-order processing for the specified TID. 324 */ 325 static int 326 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap, 327 int baparamset, int batimeout, int baseqctl) 328 { 329 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 330 331 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) { 332 /* 333 * AMPDU previously setup and not terminated with a DELBA, 334 * flush the reorder q's in case anything remains. 335 */ 336 ampdu_rx_purge(rap); 337 } 338 memset(rap, 0, sizeof(*rap)); 339 rap->rxa_wnd = (bufsiz == 0) ? 340 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 341 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START); 342 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND; 343 344 return 0; 345 } 346 347 /* 348 * Stop A-MPDU rx processing for the specified TID. 349 */ 350 static void 351 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 352 { 353 ampdu_rx_purge(rap); 354 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND); 355 } 356 357 /* 358 * Dispatch a frame from the A-MPDU reorder queue. The 359 * frame is fed back into ieee80211_input marked with an 360 * M_AMPDU_MPDU flag so it doesn't come back to us (it also 361 * permits ieee80211_input to optimize re-processing). 362 */ 363 static __inline void 364 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 365 { 366 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */ 367 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU_MPDU set */ 368 (void) ieee80211_input(ni, m, 0, 0, 0); 369 } 370 371 /* 372 * Dispatch as many frames as possible from the re-order queue. 373 * Frames will always be "at the front"; we process all frames 374 * up to the first empty slot in the window. On completion we 375 * cleanup state if there are still pending frames in the current 376 * BA window. We assume the frame at slot 0 is already handled 377 * by the caller; we always start at slot 1. 378 */ 379 static void 380 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 381 { 382 struct ieee80211vap *vap = ni->ni_vap; 383 struct mbuf *m; 384 int i; 385 386 /* flush run of frames */ 387 for (i = 1; i < rap->rxa_wnd; i++) { 388 m = rap->rxa_m[i]; 389 if (m == NULL) 390 break; 391 rap->rxa_m[i] = NULL; 392 rap->rxa_qbytes -= m->m_pkthdr.len; 393 rap->rxa_qframes--; 394 395 ampdu_dispatch(ni, m); 396 } 397 /* 398 * If frames remain, copy the mbuf pointers down so 399 * they correspond to the offsets in the new window. 400 */ 401 if (rap->rxa_qframes != 0) { 402 int n = rap->rxa_qframes, j; 403 for (j = i+1; j < rap->rxa_wnd; j++) { 404 if (rap->rxa_m[j] != NULL) { 405 rap->rxa_m[j-i] = rap->rxa_m[j]; 406 rap->rxa_m[j] = NULL; 407 if (--n == 0) 408 break; 409 } 410 } 411 KASSERT(n == 0, ("lost %d frames", n)); 412 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 413 } 414 /* 415 * Adjust the start of the BA window to 416 * reflect the frames just dispatched. 417 */ 418 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 419 vap->iv_stats.is_ampdu_rx_oor += i; 420 } 421 422 #ifdef IEEE80211_AMPDU_AGE 423 /* 424 * Dispatch all frames in the A-MPDU re-order queue. 425 */ 426 static void 427 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 428 { 429 struct ieee80211vap *vap = ni->ni_vap; 430 struct mbuf *m; 431 int i; 432 433 for (i = 0; i < rap->rxa_wnd; i++) { 434 m = rap->rxa_m[i]; 435 if (m == NULL) 436 continue; 437 rap->rxa_m[i] = NULL; 438 rap->rxa_qbytes -= m->m_pkthdr.len; 439 rap->rxa_qframes--; 440 vap->iv_stats.is_ampdu_rx_oor++; 441 442 ampdu_dispatch(ni, m); 443 if (rap->rxa_qframes == 0) 444 break; 445 } 446 } 447 #endif /* IEEE80211_AMPDU_AGE */ 448 449 /* 450 * Dispatch all frames in the A-MPDU re-order queue 451 * preceding the specified sequence number. This logic 452 * handles window moves due to a received MSDU or BAR. 453 */ 454 static void 455 ampdu_rx_flush_upto(struct ieee80211_node *ni, 456 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 457 { 458 struct ieee80211vap *vap = ni->ni_vap; 459 struct mbuf *m; 460 ieee80211_seq seqno; 461 int i; 462 463 /* 464 * Flush any complete MSDU's with a sequence number lower 465 * than winstart. Gaps may exist. Note that we may actually 466 * dispatch frames past winstart if a run continues; this is 467 * an optimization that avoids having to do a separate pass 468 * to dispatch frames after moving the BA window start. 469 */ 470 seqno = rap->rxa_start; 471 for (i = 0; i < rap->rxa_wnd; i++) { 472 m = rap->rxa_m[i]; 473 if (m != NULL) { 474 rap->rxa_m[i] = NULL; 475 rap->rxa_qbytes -= m->m_pkthdr.len; 476 rap->rxa_qframes--; 477 vap->iv_stats.is_ampdu_rx_oor++; 478 479 ampdu_dispatch(ni, m); 480 } else { 481 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 482 break; 483 } 484 seqno = IEEE80211_SEQ_INC(seqno); 485 } 486 /* 487 * If frames remain, copy the mbuf pointers down so 488 * they correspond to the offsets in the new window. 489 */ 490 if (rap->rxa_qframes != 0) { 491 int n = rap->rxa_qframes, j; 492 493 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */ 494 KASSERT(rap->rxa_m[0] == NULL, 495 ("%s: BA window slot 0 occupied", __func__)); 496 for (j = i+1; j < rap->rxa_wnd; j++) { 497 if (rap->rxa_m[j] != NULL) { 498 rap->rxa_m[j-i] = rap->rxa_m[j]; 499 rap->rxa_m[j] = NULL; 500 if (--n == 0) 501 break; 502 } 503 } 504 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 505 "BA win <%d:%d> winstart %d", 506 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 507 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 508 winstart)); 509 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 510 } 511 /* 512 * Move the start of the BA window; we use the 513 * sequence number of the last MSDU that was 514 * passed up the stack+1 or winstart if stopped on 515 * a gap in the reorder buffer. 516 */ 517 rap->rxa_start = seqno; 518 } 519 520 /* 521 * Process a received QoS data frame for an HT station. Handle 522 * A-MPDU reordering: if this frame is received out of order 523 * and falls within the BA window hold onto it. Otherwise if 524 * this frame completes a run, flush any pending frames. We 525 * return 1 if the frame is consumed. A 0 is returned if 526 * the frame should be processed normally by the caller. 527 */ 528 int 529 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 530 { 531 #define IEEE80211_FC0_QOSDATA \ 532 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 533 #define PROCESS 0 /* caller should process frame */ 534 #define CONSUMED 1 /* frame consumed, caller does nothing */ 535 struct ieee80211vap *vap = ni->ni_vap; 536 struct ieee80211_qosframe *wh; 537 struct ieee80211_rx_ampdu *rap; 538 ieee80211_seq rxseq; 539 uint8_t tid; 540 int off; 541 542 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU, 543 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags)); 544 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 545 546 /* NB: m_len known to be sufficient */ 547 wh = mtod(m, struct ieee80211_qosframe *); 548 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) { 549 /* 550 * Not QoS data, shouldn't get here but just 551 * return it to the caller for processing. 552 */ 553 return PROCESS; 554 } 555 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 556 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 557 else 558 tid = wh->i_qos[0]; 559 tid &= IEEE80211_QOS_TID; 560 rap = &ni->ni_rx_ampdu[tid]; 561 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 562 /* 563 * No ADDBA request yet, don't touch. 564 */ 565 return PROCESS; 566 } 567 rxseq = le16toh(*(uint16_t *)wh->i_seq); 568 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) { 569 /* 570 * Fragments are not allowed; toss. 571 */ 572 IEEE80211_DISCARD_MAC(vap, 573 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 574 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid, 575 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 576 vap->iv_stats.is_ampdu_rx_drop++; 577 IEEE80211_NODE_STAT(ni, rx_drop); 578 m_freem(m); 579 return CONSUMED; 580 } 581 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT; 582 rap->rxa_nframes++; 583 again: 584 if (rxseq == rap->rxa_start) { 585 /* 586 * First frame in window. 587 */ 588 if (rap->rxa_qframes != 0) { 589 /* 590 * Dispatch as many packets as we can. 591 */ 592 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 593 ampdu_dispatch(ni, m); 594 ampdu_rx_dispatch(rap, ni); 595 return CONSUMED; 596 } else { 597 /* 598 * In order; advance window and notify 599 * caller to dispatch directly. 600 */ 601 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 602 return PROCESS; 603 } 604 } 605 /* 606 * Frame is out of order; store if in the BA window. 607 */ 608 /* calculate offset in BA window */ 609 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 610 if (off < rap->rxa_wnd) { 611 /* 612 * Common case (hopefully): in the BA window. 613 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 614 */ 615 #ifdef IEEE80211_AMPDU_AGE 616 /* 617 * Check for frames sitting too long in the reorder queue. 618 * This should only ever happen if frames are not delivered 619 * without the sender otherwise notifying us (e.g. with a 620 * BAR to move the window). Typically this happens because 621 * of vendor bugs that cause the sequence number to jump. 622 * When this happens we get a gap in the reorder queue that 623 * leaves frame sitting on the queue until they get pushed 624 * out due to window moves. When the vendor does not send 625 * BAR this move only happens due to explicit packet sends 626 * 627 * NB: we only track the time of the oldest frame in the 628 * reorder q; this means that if we flush we might push 629 * frames that still "new"; if this happens then subsequent 630 * frames will result in BA window moves which cost something 631 * but is still better than a big throughput dip. 632 */ 633 if (rap->rxa_qframes != 0) { 634 /* XXX honor batimeout? */ 635 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 636 /* 637 * Too long since we received the first 638 * frame; flush the reorder buffer. 639 */ 640 if (rap->rxa_qframes != 0) { 641 vap->iv_stats.is_ampdu_rx_age += 642 rap->rxa_qframes; 643 ampdu_rx_flush(ni, rap); 644 } 645 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 646 return PROCESS; 647 } 648 } else { 649 /* 650 * First frame, start aging timer. 651 */ 652 rap->rxa_age = ticks; 653 } 654 #endif /* IEEE80211_AMPDU_AGE */ 655 /* save packet */ 656 if (rap->rxa_m[off] == NULL) { 657 rap->rxa_m[off] = m; 658 rap->rxa_qframes++; 659 rap->rxa_qbytes += m->m_pkthdr.len; 660 vap->iv_stats.is_ampdu_rx_reorder++; 661 } else { 662 IEEE80211_DISCARD_MAC(vap, 663 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 664 ni->ni_macaddr, "a-mpdu duplicate", 665 "seqno %u tid %u BA win <%u:%u>", 666 rxseq, tid, rap->rxa_start, 667 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 668 vap->iv_stats.is_rx_dup++; 669 IEEE80211_NODE_STAT(ni, rx_dup); 670 m_freem(m); 671 } 672 return CONSUMED; 673 } 674 if (off < IEEE80211_SEQ_BA_RANGE) { 675 /* 676 * Outside the BA window, but within range; 677 * flush the reorder q and move the window. 678 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 679 */ 680 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 681 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 682 rap->rxa_start, 683 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 684 rap->rxa_qframes, rxseq, tid); 685 vap->iv_stats.is_ampdu_rx_move++; 686 687 /* 688 * The spec says to flush frames up to but not including: 689 * WinStart_B = rxseq - rap->rxa_wnd + 1 690 * Then insert the frame or notify the caller to process 691 * it immediately. We can safely do this by just starting 692 * over again because we know the frame will now be within 693 * the BA window. 694 */ 695 /* NB: rxa_wnd known to be >0 */ 696 ampdu_rx_flush_upto(ni, rap, 697 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 698 goto again; 699 } else { 700 /* 701 * Outside the BA window and out of range; toss. 702 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 703 */ 704 IEEE80211_DISCARD_MAC(vap, 705 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 706 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 707 rap->rxa_start, 708 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 709 rap->rxa_qframes, rxseq, tid, 710 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 711 vap->iv_stats.is_ampdu_rx_drop++; 712 IEEE80211_NODE_STAT(ni, rx_drop); 713 m_freem(m); 714 return CONSUMED; 715 } 716 #undef CONSUMED 717 #undef PROCESS 718 #undef IEEE80211_FC0_QOSDATA 719 } 720 721 /* 722 * Process a BAR ctl frame. Dispatch all frames up to 723 * the sequence number of the frame. If this frame is 724 * out of range it's discarded. 725 */ 726 void 727 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 728 { 729 struct ieee80211vap *vap = ni->ni_vap; 730 struct ieee80211_frame_bar *wh; 731 struct ieee80211_rx_ampdu *rap; 732 ieee80211_seq rxseq; 733 int tid, off; 734 735 if (!ieee80211_recv_bar_ena) { 736 #if 0 737 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 738 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 739 #endif 740 vap->iv_stats.is_ampdu_bar_bad++; 741 return; 742 } 743 wh = mtod(m0, struct ieee80211_frame_bar *); 744 /* XXX check basic BAR */ 745 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 746 rap = &ni->ni_rx_ampdu[tid]; 747 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 748 /* 749 * No ADDBA request yet, don't touch. 750 */ 751 IEEE80211_DISCARD_MAC(vap, 752 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 753 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 754 vap->iv_stats.is_ampdu_bar_bad++; 755 return; 756 } 757 vap->iv_stats.is_ampdu_bar_rx++; 758 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 759 if (rxseq == rap->rxa_start) 760 return; 761 /* calculate offset in BA window */ 762 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 763 if (off < IEEE80211_SEQ_BA_RANGE) { 764 /* 765 * Flush the reorder q up to rxseq and move the window. 766 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 767 */ 768 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 769 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 770 rap->rxa_start, 771 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 772 rap->rxa_qframes, rxseq, tid); 773 vap->iv_stats.is_ampdu_bar_move++; 774 775 ampdu_rx_flush_upto(ni, rap, rxseq); 776 if (off >= rap->rxa_wnd) { 777 /* 778 * BAR specifies a window start to the right of BA 779 * window; we must move it explicitly since 780 * ampdu_rx_flush_upto will not. 781 */ 782 rap->rxa_start = rxseq; 783 } 784 } else { 785 /* 786 * Out of range; toss. 787 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 788 */ 789 IEEE80211_DISCARD_MAC(vap, 790 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 791 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 792 rap->rxa_start, 793 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 794 rap->rxa_qframes, rxseq, tid, 795 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 796 vap->iv_stats.is_ampdu_bar_oow++; 797 IEEE80211_NODE_STAT(ni, rx_drop); 798 } 799 } 800 801 /* 802 * Setup HT-specific state in a node. Called only 803 * when HT use is negotiated so we don't do extra 804 * work for temporary and/or legacy sta's. 805 */ 806 void 807 ieee80211_ht_node_init(struct ieee80211_node *ni) 808 { 809 struct ieee80211_tx_ampdu *tap; 810 int ac; 811 812 if (ni->ni_flags & IEEE80211_NODE_HT) { 813 /* 814 * Clean AMPDU state on re-associate. This handles the case 815 * where a station leaves w/o notifying us and then returns 816 * before node is reaped for inactivity. 817 */ 818 ieee80211_ht_node_cleanup(ni); 819 } 820 for (ac = 0; ac < WME_NUM_AC; ac++) { 821 tap = &ni->ni_tx_ampdu[ac]; 822 tap->txa_ac = ac; 823 tap->txa_ni = ni; 824 /* NB: further initialization deferred */ 825 } 826 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 827 } 828 829 /* 830 * Cleanup HT-specific state in a node. Called only 831 * when HT use has been marked. 832 */ 833 void 834 ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 835 { 836 struct ieee80211com *ic = ni->ni_ic; 837 int i; 838 839 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 840 841 /* XXX optimize this */ 842 for (i = 0; i < WME_NUM_AC; i++) { 843 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 844 if (tap->txa_flags & IEEE80211_AGGR_SETUP) 845 ampdu_tx_stop(tap); 846 } 847 for (i = 0; i < WME_NUM_TID; i++) 848 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]); 849 850 ni->ni_htcap = 0; 851 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL; 852 } 853 854 /* 855 * Age out HT resources for a station. 856 */ 857 void 858 ieee80211_ht_node_age(struct ieee80211_node *ni) 859 { 860 #ifdef IEEE80211_AMPDU_AGE 861 struct ieee80211vap *vap = ni->ni_vap; 862 uint8_t tid; 863 #endif 864 865 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 866 867 #ifdef IEEE80211_AMPDU_AGE 868 for (tid = 0; tid < WME_NUM_TID; tid++) { 869 struct ieee80211_rx_ampdu *rap; 870 871 rap = &ni->ni_rx_ampdu[tid]; 872 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 873 continue; 874 if (rap->rxa_qframes == 0) 875 continue; 876 /* 877 * Check for frames sitting too long in the reorder queue. 878 * See above for more details on what's happening here. 879 */ 880 /* XXX honor batimeout? */ 881 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 882 /* 883 * Too long since we received the first 884 * frame; flush the reorder buffer. 885 */ 886 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 887 ampdu_rx_flush(ni, rap); 888 } 889 } 890 #endif /* IEEE80211_AMPDU_AGE */ 891 } 892 893 static struct ieee80211_channel * 894 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 895 { 896 return ieee80211_find_channel(ic, c->ic_freq, 897 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 898 } 899 900 /* 901 * Adjust a channel to be HT/non-HT according to the vap's configuration. 902 */ 903 struct ieee80211_channel * 904 ieee80211_ht_adjust_channel(struct ieee80211com *ic, 905 struct ieee80211_channel *chan, int flags) 906 { 907 struct ieee80211_channel *c; 908 909 if (flags & IEEE80211_FEXT_HT) { 910 /* promote to HT if possible */ 911 if (flags & IEEE80211_FEXT_USEHT40) { 912 if (!IEEE80211_IS_CHAN_HT40(chan)) { 913 /* NB: arbitrarily pick ht40+ over ht40- */ 914 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 915 if (c == NULL) 916 c = findhtchan(ic, chan, 917 IEEE80211_CHAN_HT40D); 918 if (c == NULL) 919 c = findhtchan(ic, chan, 920 IEEE80211_CHAN_HT20); 921 if (c != NULL) 922 chan = c; 923 } 924 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 925 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 926 if (c != NULL) 927 chan = c; 928 } 929 } else if (IEEE80211_IS_CHAN_HT(chan)) { 930 /* demote to legacy, HT use is disabled */ 931 c = ieee80211_find_channel(ic, chan->ic_freq, 932 chan->ic_flags &~ IEEE80211_CHAN_HT); 933 if (c != NULL) 934 chan = c; 935 } 936 return chan; 937 } 938 939 /* 940 * Setup HT-specific state for a legacy WDS peer. 941 */ 942 void 943 ieee80211_ht_wds_init(struct ieee80211_node *ni) 944 { 945 struct ieee80211vap *vap = ni->ni_vap; 946 struct ieee80211_tx_ampdu *tap; 947 int ac; 948 949 KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested")); 950 951 /* XXX check scan cache in case peer has an ap and we have info */ 952 /* 953 * If setup with a legacy channel; locate an HT channel. 954 * Otherwise if the inherited channel (from a companion 955 * AP) is suitable use it so we use the same location 956 * for the extension channel). 957 */ 958 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 959 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 960 961 ni->ni_htcap = 0; 962 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) 963 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 964 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 965 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 966 ni->ni_chw = 40; 967 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 968 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 969 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 970 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 971 if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) 972 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 973 } else { 974 ni->ni_chw = 20; 975 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 976 } 977 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 978 if (vap->iv_flags_ext & IEEE80211_FEXT_RIFS) 979 ni->ni_flags |= IEEE80211_NODE_RIFS; 980 /* XXX does it make sense to enable SMPS? */ 981 982 ni->ni_htopmode = 0; /* XXX need protection state */ 983 ni->ni_htstbc = 0; /* XXX need info */ 984 985 for (ac = 0; ac < WME_NUM_AC; ac++) { 986 tap = &ni->ni_tx_ampdu[ac]; 987 tap->txa_ac = ac; 988 } 989 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */ 990 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 991 } 992 993 /* 994 * Notify hostap vaps of a change in the HTINFO ie. 995 */ 996 static void 997 htinfo_notify(struct ieee80211com *ic) 998 { 999 struct ieee80211vap *vap; 1000 int first = 1; 1001 1002 IEEE80211_LOCK_ASSERT(ic); 1003 1004 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 1005 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 1006 continue; 1007 if (vap->iv_state != IEEE80211_S_RUN || 1008 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan)) 1009 continue; 1010 if (first) { 1011 IEEE80211_NOTE(vap, 1012 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 1013 vap->iv_bss, 1014 "HT bss occupancy change: %d sta, %d ht, " 1015 "%d ht40%s, HT protmode now 0x%x" 1016 , ic->ic_sta_assoc 1017 , ic->ic_ht_sta_assoc 1018 , ic->ic_ht40_sta_assoc 1019 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ? 1020 ", non-HT sta present" : "" 1021 , ic->ic_curhtprotmode); 1022 first = 0; 1023 } 1024 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 1025 } 1026 } 1027 1028 /* 1029 * Calculate HT protection mode from current 1030 * state and handle updates. 1031 */ 1032 static void 1033 htinfo_update(struct ieee80211com *ic) 1034 { 1035 uint8_t protmode; 1036 1037 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1038 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1039 | IEEE80211_HTINFO_NONHT_PRESENT; 1040 } else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) { 1041 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1042 | IEEE80211_HTINFO_NONHT_PRESENT; 1043 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1044 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1045 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1046 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1047 } else { 1048 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1049 } 1050 if (protmode != ic->ic_curhtprotmode) { 1051 ic->ic_curhtprotmode = protmode; 1052 htinfo_notify(ic); 1053 } 1054 } 1055 1056 /* 1057 * Handle an HT station joining a BSS. 1058 */ 1059 void 1060 ieee80211_ht_node_join(struct ieee80211_node *ni) 1061 { 1062 struct ieee80211com *ic = ni->ni_ic; 1063 1064 IEEE80211_LOCK_ASSERT(ic); 1065 1066 if (ni->ni_flags & IEEE80211_NODE_HT) { 1067 ic->ic_ht_sta_assoc++; 1068 if (ni->ni_chw == 40) 1069 ic->ic_ht40_sta_assoc++; 1070 } 1071 htinfo_update(ic); 1072 } 1073 1074 /* 1075 * Handle an HT station leaving a BSS. 1076 */ 1077 void 1078 ieee80211_ht_node_leave(struct ieee80211_node *ni) 1079 { 1080 struct ieee80211com *ic = ni->ni_ic; 1081 1082 IEEE80211_LOCK_ASSERT(ic); 1083 1084 if (ni->ni_flags & IEEE80211_NODE_HT) { 1085 ic->ic_ht_sta_assoc--; 1086 if (ni->ni_chw == 40) 1087 ic->ic_ht40_sta_assoc--; 1088 } 1089 htinfo_update(ic); 1090 } 1091 1092 /* 1093 * Public version of htinfo_update; used for processing 1094 * beacon frames from overlapping bss. 1095 * 1096 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1097 * (on receipt of a beacon that advertises MIXED) or 1098 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1099 * from an overlapping legacy bss). We treat MIXED with 1100 * a higher precedence than PROTOPT (i.e. we will not change 1101 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1102 * corresponds to how we handle things in htinfo_update. 1103 */ 1104 void 1105 ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1106 { 1107 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1108 IEEE80211_LOCK(ic); 1109 1110 /* track non-HT station presence */ 1111 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1112 ("protmode 0x%x", protmode)); 1113 ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR; 1114 ic->ic_lastnonht = ticks; 1115 1116 if (protmode != ic->ic_curhtprotmode && 1117 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED || 1118 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) { 1119 /* push beacon update */ 1120 ic->ic_curhtprotmode = protmode; 1121 htinfo_notify(ic); 1122 } 1123 IEEE80211_UNLOCK(ic); 1124 #undef OPMODE 1125 } 1126 1127 /* 1128 * Time out presence of an overlapping bss with non-HT 1129 * stations. When operating in hostap mode we listen for 1130 * beacons from other stations and if we identify a non-HT 1131 * station is present we update the opmode field of the 1132 * HTINFO ie. To identify when all non-HT stations are 1133 * gone we time out this condition. 1134 */ 1135 void 1136 ieee80211_ht_timeout(struct ieee80211com *ic) 1137 { 1138 IEEE80211_LOCK_ASSERT(ic); 1139 1140 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) && 1141 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1142 #if 0 1143 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1144 "%s", "time out non-HT STA present on channel"); 1145 #endif 1146 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 1147 htinfo_update(ic); 1148 } 1149 } 1150 1151 /* unalligned little endian access */ 1152 #define LE_READ_2(p) \ 1153 ((uint16_t) \ 1154 ((((const uint8_t *)(p))[0] ) | \ 1155 (((const uint8_t *)(p))[1] << 8))) 1156 1157 /* 1158 * Process an 802.11n HT capabilities ie. 1159 */ 1160 void 1161 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1162 { 1163 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1164 /* 1165 * Station used Vendor OUI ie to associate; 1166 * mark the node so when we respond we'll use 1167 * the Vendor OUI's and not the standard ie's. 1168 */ 1169 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1170 ie += 4; 1171 } else 1172 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1173 1174 ni->ni_htcap = LE_READ_2(ie + 1175 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1176 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1177 } 1178 1179 static void 1180 htinfo_parse(struct ieee80211_node *ni, 1181 const struct ieee80211_ie_htinfo *htinfo) 1182 { 1183 uint16_t w; 1184 1185 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1186 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1187 w = LE_READ_2(&htinfo->hi_byte2); 1188 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1189 w = LE_READ_2(&htinfo->hi_byte45); 1190 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1191 } 1192 1193 /* 1194 * Parse an 802.11n HT info ie and save useful information 1195 * to the node state. Note this does not effect any state 1196 * changes such as for channel width change. 1197 */ 1198 void 1199 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1200 { 1201 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1202 ie += 4; 1203 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie); 1204 } 1205 1206 /* 1207 * Handle 11n channel switch. Use the received HT ie's to 1208 * identify the right channel to use. If we cannot locate it 1209 * in the channel table then fallback to legacy operation. 1210 * Note that we use this information to identify the node's 1211 * channel only; the caller is responsible for insuring any 1212 * required channel change is done (e.g. in sta mode when 1213 * parsing the contents of a beacon frame). 1214 */ 1215 static void 1216 htinfo_update_chw(struct ieee80211_node *ni, int htflags) 1217 { 1218 struct ieee80211com *ic = ni->ni_ic; 1219 struct ieee80211_channel *c; 1220 int chanflags; 1221 1222 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1223 if (chanflags != ni->ni_chan->ic_flags) { 1224 /* XXX not right for ht40- */ 1225 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1226 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1227 /* 1228 * No HT40 channel entry in our table; fall back 1229 * to HT20 operation. This should not happen. 1230 */ 1231 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1232 #if 0 1233 IEEE80211_NOTE(ni->ni_vap, 1234 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1235 "no HT40 channel (freq %u), falling back to HT20", 1236 ni->ni_chan->ic_freq); 1237 #endif 1238 /* XXX stat */ 1239 } 1240 if (c != NULL && c != ni->ni_chan) { 1241 IEEE80211_NOTE(ni->ni_vap, 1242 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1243 "switch station to HT%d channel %u/0x%x", 1244 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1245 c->ic_freq, c->ic_flags); 1246 ni->ni_chan = c; 1247 } 1248 /* NB: caller responsible for forcing any channel change */ 1249 } 1250 /* update node's tx channel width */ 1251 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1252 } 1253 1254 /* 1255 * Update 11n MIMO PS state according to received htcap. 1256 */ 1257 static __inline int 1258 htcap_update_mimo_ps(struct ieee80211_node *ni) 1259 { 1260 uint16_t oflags = ni->ni_flags; 1261 1262 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) { 1263 case IEEE80211_HTCAP_SMPS_DYNAMIC: 1264 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1265 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1266 break; 1267 case IEEE80211_HTCAP_SMPS_ENA: 1268 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1269 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1270 break; 1271 case IEEE80211_HTCAP_SMPS_OFF: 1272 default: /* disable on rx of reserved value */ 1273 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1274 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1275 break; 1276 } 1277 return (oflags ^ ni->ni_flags); 1278 } 1279 1280 /* 1281 * Update short GI state according to received htcap 1282 * and local settings. 1283 */ 1284 static __inline void 1285 htcap_update_shortgi(struct ieee80211_node *ni) 1286 { 1287 struct ieee80211vap *vap = ni->ni_vap; 1288 1289 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40); 1290 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) && 1291 (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20)) 1292 ni->ni_flags |= IEEE80211_NODE_SGI20; 1293 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) && 1294 (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40)) 1295 ni->ni_flags |= IEEE80211_NODE_SGI40; 1296 } 1297 1298 /* 1299 * Parse and update HT-related state extracted from 1300 * the HT cap and info ie's. 1301 */ 1302 void 1303 ieee80211_ht_updateparams(struct ieee80211_node *ni, 1304 const uint8_t *htcapie, const uint8_t *htinfoie) 1305 { 1306 struct ieee80211vap *vap = ni->ni_vap; 1307 const struct ieee80211_ie_htinfo *htinfo; 1308 int htflags; 1309 1310 ieee80211_parse_htcap(ni, htcapie); 1311 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1312 htcap_update_mimo_ps(ni); 1313 htcap_update_shortgi(ni); 1314 1315 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR) 1316 htinfoie += 4; 1317 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie; 1318 htinfo_parse(ni, htinfo); 1319 1320 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1321 IEEE80211_CHAN_HT20 : 0; 1322 /* NB: honor operating mode constraint */ 1323 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1324 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1325 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1326 htflags = IEEE80211_CHAN_HT40U; 1327 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1328 htflags = IEEE80211_CHAN_HT40D; 1329 } 1330 htinfo_update_chw(ni, htflags); 1331 1332 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) && 1333 (vap->iv_flags_ext & IEEE80211_FEXT_RIFS)) 1334 ni->ni_flags |= IEEE80211_NODE_RIFS; 1335 else 1336 ni->ni_flags &= ~IEEE80211_NODE_RIFS; 1337 } 1338 1339 /* 1340 * Parse and update HT-related state extracted from the HT cap ie 1341 * for a station joining an HT BSS. 1342 */ 1343 void 1344 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie) 1345 { 1346 struct ieee80211vap *vap = ni->ni_vap; 1347 int htflags; 1348 1349 ieee80211_parse_htcap(ni, htcapie); 1350 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1351 htcap_update_mimo_ps(ni); 1352 htcap_update_shortgi(ni); 1353 1354 /* NB: honor operating mode constraint */ 1355 /* XXX 40 MHZ intolerant */ 1356 htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ? 1357 IEEE80211_CHAN_HT20 : 0; 1358 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1359 (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) { 1360 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan)) 1361 htflags = IEEE80211_CHAN_HT40U; 1362 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan)) 1363 htflags = IEEE80211_CHAN_HT40D; 1364 } 1365 htinfo_update_chw(ni, htflags); 1366 } 1367 1368 /* 1369 * Install received HT rate set by parsing the HT cap ie. 1370 */ 1371 int 1372 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1373 { 1374 struct ieee80211vap *vap = ni->ni_vap; 1375 const struct ieee80211_ie_htcap *htcap; 1376 struct ieee80211_htrateset *rs; 1377 int i; 1378 1379 rs = &ni->ni_htrates; 1380 memset(rs, 0, sizeof(*rs)); 1381 if (ie != NULL) { 1382 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1383 ie += 4; 1384 htcap = (const struct ieee80211_ie_htcap *) ie; 1385 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1386 if (isclr(htcap->hc_mcsset, i)) 1387 continue; 1388 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1389 IEEE80211_NOTE(vap, 1390 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1391 "WARNING, HT rate set too large; only " 1392 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1393 vap->iv_stats.is_rx_rstoobig++; 1394 break; 1395 } 1396 rs->rs_rates[rs->rs_nrates++] = i; 1397 } 1398 } 1399 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1400 } 1401 1402 /* 1403 * Mark rates in a node's HT rate set as basic according 1404 * to the information in the supplied HT info ie. 1405 */ 1406 void 1407 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1408 { 1409 const struct ieee80211_ie_htinfo *htinfo; 1410 struct ieee80211_htrateset *rs; 1411 int i, j; 1412 1413 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1414 ie += 4; 1415 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1416 rs = &ni->ni_htrates; 1417 if (rs->rs_nrates == 0) { 1418 IEEE80211_NOTE(ni->ni_vap, 1419 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1420 "%s", "WARNING, empty HT rate set"); 1421 return; 1422 } 1423 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1424 if (isclr(htinfo->hi_basicmcsset, i)) 1425 continue; 1426 for (j = 0; j < rs->rs_nrates; j++) 1427 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1428 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1429 } 1430 } 1431 1432 static void 1433 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap) 1434 { 1435 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1436 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1437 } 1438 1439 static void 1440 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap) 1441 { 1442 struct ieee80211_node *ni = tap->txa_ni; 1443 struct ieee80211com *ic = ni->ni_ic; 1444 1445 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP, 1446 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac)); 1447 1448 /* 1449 * Stop BA stream if setup so driver has a chance 1450 * to reclaim any resources it might have allocated. 1451 */ 1452 ic->ic_addba_stop(ni, tap); 1453 /* 1454 * Stop any pending BAR transmit. 1455 */ 1456 bar_stop_timer(tap); 1457 1458 tap->txa_lastsample = 0; 1459 tap->txa_avgpps = 0; 1460 /* NB: clearing NAK means we may re-send ADDBA */ 1461 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 1462 } 1463 1464 static void 1465 addba_timeout(void *arg) 1466 { 1467 struct ieee80211_tx_ampdu *tap = arg; 1468 1469 /* XXX ? */ 1470 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1471 tap->txa_attempts++; 1472 } 1473 1474 static void 1475 addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1476 { 1477 /* XXX use CALLOUT_PENDING instead? */ 1478 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1479 addba_timeout, tap); 1480 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1481 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1482 } 1483 1484 static void 1485 addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1486 { 1487 /* XXX use CALLOUT_PENDING instead? */ 1488 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1489 callout_stop(&tap->txa_timer); 1490 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1491 } 1492 } 1493 1494 /* 1495 * Default method for requesting A-MPDU tx aggregation. 1496 * We setup the specified state block and start a timer 1497 * to wait for an ADDBA response frame. 1498 */ 1499 static int 1500 ieee80211_addba_request(struct ieee80211_node *ni, 1501 struct ieee80211_tx_ampdu *tap, 1502 int dialogtoken, int baparamset, int batimeout) 1503 { 1504 int bufsiz; 1505 1506 /* XXX locking */ 1507 tap->txa_token = dialogtoken; 1508 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1509 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1510 tap->txa_wnd = (bufsiz == 0) ? 1511 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1512 addba_start_timeout(tap); 1513 return 1; 1514 } 1515 1516 /* 1517 * Default method for processing an A-MPDU tx aggregation 1518 * response. We shutdown any pending timer and update the 1519 * state block according to the reply. 1520 */ 1521 static int 1522 ieee80211_addba_response(struct ieee80211_node *ni, 1523 struct ieee80211_tx_ampdu *tap, 1524 int status, int baparamset, int batimeout) 1525 { 1526 int bufsiz, tid; 1527 1528 /* XXX locking */ 1529 addba_stop_timeout(tap); 1530 if (status == IEEE80211_STATUS_SUCCESS) { 1531 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1532 /* XXX override our request? */ 1533 tap->txa_wnd = (bufsiz == 0) ? 1534 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1535 /* XXX AC/TID */ 1536 tid = MS(baparamset, IEEE80211_BAPS_TID); 1537 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1538 tap->txa_attempts = 0; 1539 } else { 1540 /* mark tid so we don't try again */ 1541 tap->txa_flags |= IEEE80211_AGGR_NAK; 1542 } 1543 return 1; 1544 } 1545 1546 /* 1547 * Default method for stopping A-MPDU tx aggregation. 1548 * Any timer is cleared and we drain any pending frames. 1549 */ 1550 static void 1551 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1552 { 1553 /* XXX locking */ 1554 addba_stop_timeout(tap); 1555 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1556 /* XXX clear aggregation queue */ 1557 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1558 } 1559 tap->txa_attempts = 0; 1560 } 1561 1562 /* 1563 * Process a received action frame using the default aggregation 1564 * policy. We intercept ADDBA-related frames and use them to 1565 * update our aggregation state. All other frames are passed up 1566 * for processing by ieee80211_recv_action. 1567 */ 1568 static void 1569 ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1570 const uint8_t *frm, const uint8_t *efrm) 1571 { 1572 struct ieee80211com *ic = ni->ni_ic; 1573 struct ieee80211vap *vap = ni->ni_vap; 1574 const struct ieee80211_action *ia; 1575 struct ieee80211_rx_ampdu *rap; 1576 struct ieee80211_tx_ampdu *tap; 1577 uint8_t dialogtoken, policy; 1578 uint16_t baparamset, batimeout, baseqctl, code; 1579 uint16_t args[4]; 1580 int tid, ac, bufsiz; 1581 1582 ia = (const struct ieee80211_action *) frm; 1583 switch (ia->ia_category) { 1584 case IEEE80211_ACTION_CAT_BA: 1585 switch (ia->ia_action) { 1586 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1587 dialogtoken = frm[2]; 1588 baparamset = LE_READ_2(frm+3); 1589 batimeout = LE_READ_2(frm+5); 1590 baseqctl = LE_READ_2(frm+7); 1591 1592 tid = MS(baparamset, IEEE80211_BAPS_TID); 1593 1594 IEEE80211_NOTE(vap, 1595 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1596 "recv ADDBA request: dialogtoken %u " 1597 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1598 "baseqctl %d:%d", 1599 dialogtoken, baparamset, 1600 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ), 1601 batimeout, 1602 MS(baseqctl, IEEE80211_BASEQ_START), 1603 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1604 1605 rap = &ni->ni_rx_ampdu[tid]; 1606 1607 /* Send ADDBA response */ 1608 args[0] = dialogtoken; 1609 /* 1610 * NB: We ack only if the sta associated with HT and 1611 * the ap is configured to do AMPDU rx (the latter 1612 * violates the 11n spec and is mostly for testing). 1613 */ 1614 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1615 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) { 1616 /* XXX handle ampdu_rx_start failure */ 1617 ic->ic_ampdu_rx_start(ni, rap, 1618 baparamset, batimeout, baseqctl); 1619 1620 args[1] = IEEE80211_STATUS_SUCCESS; 1621 } else { 1622 IEEE80211_NOTE(vap, 1623 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1624 ni, "reject ADDBA request: %s", 1625 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1626 "administratively disabled" : 1627 "not negotiated for station"); 1628 vap->iv_stats.is_addba_reject++; 1629 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1630 } 1631 /* XXX honor rap flags? */ 1632 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1633 | SM(tid, IEEE80211_BAPS_TID) 1634 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1635 ; 1636 args[3] = 0; 1637 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1638 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1639 return; 1640 1641 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1642 dialogtoken = frm[2]; 1643 code = LE_READ_2(frm+3); 1644 baparamset = LE_READ_2(frm+5); 1645 tid = MS(baparamset, IEEE80211_BAPS_TID); 1646 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1647 policy = MS(baparamset, IEEE80211_BAPS_POLICY); 1648 batimeout = LE_READ_2(frm+7); 1649 1650 ac = TID_TO_WME_AC(tid); 1651 tap = &ni->ni_tx_ampdu[ac]; 1652 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1653 IEEE80211_DISCARD_MAC(vap, 1654 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1655 ni->ni_macaddr, "ADDBA response", 1656 "no pending ADDBA, tid %d dialogtoken %u " 1657 "code %d", tid, dialogtoken, code); 1658 vap->iv_stats.is_addba_norequest++; 1659 return; 1660 } 1661 if (dialogtoken != tap->txa_token) { 1662 IEEE80211_DISCARD_MAC(vap, 1663 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1664 ni->ni_macaddr, "ADDBA response", 1665 "dialogtoken mismatch: waiting for %d, " 1666 "received %d, tid %d code %d", 1667 tap->txa_token, dialogtoken, tid, code); 1668 vap->iv_stats.is_addba_badtoken++; 1669 return; 1670 } 1671 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */ 1672 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) { 1673 IEEE80211_DISCARD_MAC(vap, 1674 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1675 ni->ni_macaddr, "ADDBA response", 1676 "policy mismatch: expecting %s, " 1677 "received %s, tid %d code %d", 1678 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE, 1679 policy, tid, code); 1680 vap->iv_stats.is_addba_badpolicy++; 1681 return; 1682 } 1683 #if 0 1684 /* XXX we take MIN in ieee80211_addba_response */ 1685 if (bufsiz > IEEE80211_AGGR_BAWMAX) { 1686 IEEE80211_DISCARD_MAC(vap, 1687 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1688 ni->ni_macaddr, "ADDBA response", 1689 "BA window too large: max %d, " 1690 "received %d, tid %d code %d", 1691 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code); 1692 vap->iv_stats.is_addba_badbawinsize++; 1693 return; 1694 } 1695 #endif 1696 IEEE80211_NOTE(vap, 1697 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1698 "recv ADDBA response: dialogtoken %u code %d " 1699 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1700 dialogtoken, code, baparamset, tid, bufsiz, 1701 batimeout); 1702 ic->ic_addba_response(ni, tap, 1703 code, baparamset, batimeout); 1704 return; 1705 1706 case IEEE80211_ACTION_BA_DELBA: 1707 baparamset = LE_READ_2(frm+2); 1708 code = LE_READ_2(frm+4); 1709 1710 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1711 1712 IEEE80211_NOTE(vap, 1713 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1714 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1715 "code %d", baparamset, tid, 1716 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1717 1718 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1719 ac = TID_TO_WME_AC(tid); 1720 tap = &ni->ni_tx_ampdu[ac]; 1721 ic->ic_addba_stop(ni, tap); 1722 } else { 1723 rap = &ni->ni_rx_ampdu[tid]; 1724 ic->ic_ampdu_rx_stop(ni, rap); 1725 } 1726 return; 1727 } 1728 break; 1729 } 1730 ieee80211_recv_action(ni, frm, efrm); 1731 } 1732 1733 /* 1734 * Process a received 802.11n action frame. 1735 * Aggregation-related frames are assumed to be handled 1736 * already; we handle any other frames we can, otherwise 1737 * complain about being unsupported (with debugging). 1738 */ 1739 void 1740 ieee80211_recv_action(struct ieee80211_node *ni, 1741 const uint8_t *frm, const uint8_t *efrm) 1742 { 1743 struct ieee80211vap *vap = ni->ni_vap; 1744 const struct ieee80211_action *ia; 1745 int chw; 1746 1747 ia = (const struct ieee80211_action *) frm; 1748 switch (ia->ia_category) { 1749 case IEEE80211_ACTION_CAT_BA: 1750 IEEE80211_NOTE(vap, 1751 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1752 "%s: BA action %d not implemented", __func__, 1753 ia->ia_action); 1754 vap->iv_stats.is_rx_mgtdiscard++; 1755 break; 1756 case IEEE80211_ACTION_CAT_HT: 1757 switch (ia->ia_action) { 1758 case IEEE80211_ACTION_HT_TXCHWIDTH: 1759 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1760 IEEE80211_NOTE(vap, 1761 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1762 "%s: HT txchwidth, width %d%s", 1763 __func__, chw, ni->ni_chw != chw ? "*" : ""); 1764 if (chw != ni->ni_chw) { 1765 ni->ni_chw = chw; 1766 /* XXX notify on change */ 1767 } 1768 break; 1769 case IEEE80211_ACTION_HT_MIMOPWRSAVE: { 1770 const struct ieee80211_action_ht_mimopowersave *mps = 1771 (const struct ieee80211_action_ht_mimopowersave *) ia; 1772 /* XXX check iv_htcaps */ 1773 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA) 1774 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1775 else 1776 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1777 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE) 1778 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1779 else 1780 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1781 /* XXX notify on change */ 1782 IEEE80211_NOTE(vap, 1783 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1784 "%s: HT MIMO PS (%s%s)", __func__, 1785 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? 1786 "on" : "off", 1787 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? 1788 "+rts" : "" 1789 ); 1790 break; 1791 } 1792 default: 1793 IEEE80211_NOTE(vap, 1794 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1795 "%s: HT action %d not implemented", __func__, 1796 ia->ia_action); 1797 vap->iv_stats.is_rx_mgtdiscard++; 1798 break; 1799 } 1800 break; 1801 default: 1802 IEEE80211_NOTE(vap, 1803 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1804 "%s: category %d not implemented", __func__, 1805 ia->ia_category); 1806 vap->iv_stats.is_rx_mgtdiscard++; 1807 break; 1808 } 1809 } 1810 1811 /* 1812 * Transmit processing. 1813 */ 1814 1815 /* 1816 * Check if A-MPDU should be requested/enabled for a stream. 1817 * We require a traffic rate above a per-AC threshold and we 1818 * also handle backoff from previous failed attempts. 1819 * 1820 * Drivers may override this method to bring in information 1821 * such as link state conditions in making the decision. 1822 */ 1823 static int 1824 ieee80211_ampdu_enable(struct ieee80211_node *ni, 1825 struct ieee80211_tx_ampdu *tap) 1826 { 1827 struct ieee80211vap *vap = ni->ni_vap; 1828 1829 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1830 return 0; 1831 /* XXX check rssi? */ 1832 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1833 ticks < tap->txa_nextrequest) { 1834 /* 1835 * Don't retry too often; txa_nextrequest is set 1836 * to the minimum interval we'll retry after 1837 * ieee80211_addba_maxtries failed attempts are made. 1838 */ 1839 return 0; 1840 } 1841 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1842 "enable AMPDU on %s, avgpps %d pkts %d", 1843 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts); 1844 return 1; 1845 } 1846 1847 /* 1848 * Request A-MPDU tx aggregation. Setup local state and 1849 * issue an ADDBA request. BA use will only happen after 1850 * the other end replies with ADDBA response. 1851 */ 1852 int 1853 ieee80211_ampdu_request(struct ieee80211_node *ni, 1854 struct ieee80211_tx_ampdu *tap) 1855 { 1856 struct ieee80211com *ic = ni->ni_ic; 1857 uint16_t args[4]; 1858 int tid, dialogtoken; 1859 static int tokens = 0; /* XXX */ 1860 1861 /* XXX locking */ 1862 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1863 /* do deferred setup of state */ 1864 ampdu_tx_setup(tap); 1865 } 1866 /* XXX hack for not doing proper locking */ 1867 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1868 1869 dialogtoken = (tokens+1) % 63; /* XXX */ 1870 tid = WME_AC_TO_TID(tap->txa_ac); 1871 tap->txa_start = ni->ni_txseqs[tid]; 1872 1873 args[0] = dialogtoken; 1874 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1875 | SM(tid, IEEE80211_BAPS_TID) 1876 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1877 ; 1878 args[2] = 0; /* batimeout */ 1879 /* NB: do first so there's no race against reply */ 1880 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1881 /* unable to setup state, don't make request */ 1882 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1883 ni, "%s: could not setup BA stream for AC %d", 1884 __func__, tap->txa_ac); 1885 /* defer next try so we don't slam the driver with requests */ 1886 tap->txa_attempts = ieee80211_addba_maxtries; 1887 /* NB: check in case driver wants to override */ 1888 if (tap->txa_nextrequest <= ticks) 1889 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 1890 return 0; 1891 } 1892 tokens = dialogtoken; /* allocate token */ 1893 /* NB: after calling ic_addba_request so driver can set txa_start */ 1894 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START) 1895 | SM(0, IEEE80211_BASEQ_FRAG) 1896 ; 1897 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1898 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1899 } 1900 1901 /* 1902 * Terminate an AMPDU tx stream. State is reclaimed 1903 * and the peer notified with a DelBA Action frame. 1904 */ 1905 void 1906 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap, 1907 int reason) 1908 { 1909 struct ieee80211com *ic = ni->ni_ic; 1910 struct ieee80211vap *vap = ni->ni_vap; 1911 uint16_t args[4]; 1912 1913 /* XXX locking */ 1914 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 1915 if (IEEE80211_AMPDU_RUNNING(tap)) { 1916 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1917 ni, "%s: stop BA stream for AC %d (reason %d)", 1918 __func__, tap->txa_ac, reason); 1919 vap->iv_stats.is_ampdu_stop++; 1920 1921 ic->ic_addba_stop(ni, tap); 1922 args[0] = WME_AC_TO_TID(tap->txa_ac); 1923 args[1] = IEEE80211_DELBAPS_INIT; 1924 args[2] = reason; /* XXX reason code */ 1925 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1926 IEEE80211_ACTION_BA_DELBA, args); 1927 } else { 1928 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1929 ni, "%s: BA stream for AC %d not running (reason %d)", 1930 __func__, tap->txa_ac, reason); 1931 vap->iv_stats.is_ampdu_stop_failed++; 1932 } 1933 } 1934 1935 static void 1936 bar_timeout(void *arg) 1937 { 1938 struct ieee80211_tx_ampdu *tap = arg; 1939 struct ieee80211_node *ni = tap->txa_ni; 1940 1941 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0, 1942 ("bar/addba collision, flags 0x%x", tap->txa_flags)); 1943 1944 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1945 ni, "%s: tid %u flags 0x%x attempts %d", __func__, 1946 tap->txa_ac, tap->txa_flags, tap->txa_attempts); 1947 1948 /* guard against race with bar_tx_complete */ 1949 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 1950 return; 1951 /* XXX ? */ 1952 if (tap->txa_attempts >= ieee80211_bar_maxtries) 1953 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT); 1954 else 1955 ieee80211_send_bar(ni, tap, tap->txa_seqpending); 1956 } 1957 1958 static void 1959 bar_start_timer(struct ieee80211_tx_ampdu *tap) 1960 { 1961 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap); 1962 } 1963 1964 static void 1965 bar_stop_timer(struct ieee80211_tx_ampdu *tap) 1966 { 1967 callout_stop(&tap->txa_timer); 1968 } 1969 1970 static void 1971 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status) 1972 { 1973 struct ieee80211_tx_ampdu *tap = arg; 1974 1975 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1976 ni, "%s: tid %u flags 0x%x pending %d status %d", 1977 __func__, tap->txa_ac, tap->txa_flags, 1978 callout_pending(&tap->txa_timer), status); 1979 1980 /* XXX locking */ 1981 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) && 1982 callout_pending(&tap->txa_timer)) { 1983 struct ieee80211com *ic = ni->ni_ic; 1984 1985 if (status) /* ACK'd */ 1986 bar_stop_timer(tap); 1987 ic->ic_bar_response(ni, tap, status); 1988 /* NB: just let timer expire so we pace requests */ 1989 } 1990 } 1991 1992 static void 1993 ieee80211_bar_response(struct ieee80211_node *ni, 1994 struct ieee80211_tx_ampdu *tap, int status) 1995 { 1996 1997 if (status != 0) { /* got ACK */ 1998 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1999 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u", 2000 tap->txa_start, 2001 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1), 2002 tap->txa_qframes, tap->txa_seqpending, 2003 WME_AC_TO_TID(tap->txa_ac)); 2004 2005 /* NB: timer already stopped in bar_tx_complete */ 2006 tap->txa_start = tap->txa_seqpending; 2007 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2008 } 2009 } 2010 2011 /* 2012 * Transmit a BAR frame to the specified node. The 2013 * BAR contents are drawn from the supplied aggregation 2014 * state associated with the node. 2015 * 2016 * NB: we only handle immediate ACK w/ compressed bitmap. 2017 */ 2018 int 2019 ieee80211_send_bar(struct ieee80211_node *ni, 2020 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq) 2021 { 2022 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2023 struct ieee80211vap *vap = ni->ni_vap; 2024 struct ieee80211com *ic = ni->ni_ic; 2025 struct ieee80211_frame_bar *bar; 2026 struct mbuf *m; 2027 uint16_t barctl, barseqctl; 2028 uint8_t *frm; 2029 int tid, ret; 2030 2031 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) { 2032 /* no ADDBA response, should not happen */ 2033 /* XXX stat+msg */ 2034 return EINVAL; 2035 } 2036 /* XXX locking */ 2037 bar_stop_timer(tap); 2038 2039 ieee80211_ref_node(ni); 2040 2041 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar)); 2042 if (m == NULL) 2043 senderr(ENOMEM, is_tx_nobuf); 2044 2045 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) { 2046 m_freem(m); 2047 senderr(ENOMEM, is_tx_nobuf); /* XXX */ 2048 /* NOTREACHED */ 2049 } 2050 2051 bar = mtod(m, struct ieee80211_frame_bar *); 2052 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2053 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 2054 bar->i_fc[1] = 0; 2055 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr); 2056 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr); 2057 2058 tid = WME_AC_TO_TID(tap->txa_ac); 2059 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 2060 0 : IEEE80211_BAR_NOACK) 2061 | IEEE80211_BAR_COMP 2062 | SM(tid, IEEE80211_BAR_TID) 2063 ; 2064 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START); 2065 /* NB: known to have proper alignment */ 2066 bar->i_ctl = htole16(barctl); 2067 bar->i_seq = htole16(barseqctl); 2068 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar); 2069 2070 M_WME_SETAC(m, WME_AC_VO); 2071 2072 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 2073 2074 /* XXX locking */ 2075 /* init/bump attempts counter */ 2076 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 2077 tap->txa_attempts = 1; 2078 else 2079 tap->txa_attempts++; 2080 tap->txa_seqpending = seq; 2081 tap->txa_flags |= IEEE80211_AGGR_BARPEND; 2082 2083 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N, 2084 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)", 2085 tid, barctl, seq, tap->txa_attempts); 2086 2087 ret = ic->ic_raw_xmit(ni, m, NULL); 2088 if (ret != 0) { 2089 /* xmit failed, clear state flag */ 2090 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2091 goto bad; 2092 } 2093 /* XXX hack against tx complete happening before timer is started */ 2094 if (tap->txa_flags & IEEE80211_AGGR_BARPEND) 2095 bar_start_timer(tap); 2096 return 0; 2097 bad: 2098 ieee80211_free_node(ni); 2099 return ret; 2100 #undef senderr 2101 } 2102 2103 /* 2104 * Send an action management frame. The arguments are stuff 2105 * into a frame without inspection; the caller is assumed to 2106 * prepare them carefully (e.g. based on the aggregation state). 2107 */ 2108 int 2109 ieee80211_send_action(struct ieee80211_node *ni, 2110 int category, int action, uint16_t args[4]) 2111 { 2112 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2113 #define ADDSHORT(frm, v) do { \ 2114 frm[0] = (v) & 0xff; \ 2115 frm[1] = (v) >> 8; \ 2116 frm += 2; \ 2117 } while (0) 2118 struct ieee80211vap *vap = ni->ni_vap; 2119 struct ieee80211com *ic = ni->ni_ic; 2120 struct ieee80211_bpf_params params; 2121 struct mbuf *m; 2122 uint8_t *frm; 2123 uint16_t baparamset; 2124 int ret; 2125 2126 KASSERT(ni != NULL, ("null node")); 2127 2128 /* 2129 * Hold a reference on the node so it doesn't go away until after 2130 * the xmit is complete all the way in the driver. On error we 2131 * will remove our reference. 2132 */ 2133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2134 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2135 __func__, __LINE__, 2136 ni, ether_sprintf(ni->ni_macaddr), 2137 ieee80211_node_refcnt(ni)+1); 2138 ieee80211_ref_node(ni); 2139 2140 m = ieee80211_getmgtframe(&frm, 2141 ic->ic_headroom + sizeof(struct ieee80211_frame), 2142 sizeof(uint16_t) /* action+category */ 2143 /* XXX may action payload */ 2144 + sizeof(struct ieee80211_action_ba_addbaresponse) 2145 ); 2146 if (m == NULL) 2147 senderr(ENOMEM, is_tx_nobuf); 2148 2149 *frm++ = category; 2150 *frm++ = action; 2151 switch (category) { 2152 case IEEE80211_ACTION_CAT_BA: 2153 switch (action) { 2154 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 2155 IEEE80211_NOTE(vap, 2156 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2157 "send ADDBA request: dialogtoken %d " 2158 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 2159 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 2160 args[2], args[3]); 2161 2162 *frm++ = args[0]; /* dialog token */ 2163 ADDSHORT(frm, args[1]); /* baparamset */ 2164 ADDSHORT(frm, args[2]); /* batimeout */ 2165 ADDSHORT(frm, args[3]); /* baseqctl */ 2166 break; 2167 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 2168 IEEE80211_NOTE(vap, 2169 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2170 "send ADDBA response: dialogtoken %d status %d " 2171 "baparamset 0x%x (tid %d) batimeout %d", 2172 args[0], args[1], args[2], 2173 MS(args[2], IEEE80211_BAPS_TID), args[3]); 2174 2175 *frm++ = args[0]; /* dialog token */ 2176 ADDSHORT(frm, args[1]); /* statuscode */ 2177 ADDSHORT(frm, args[2]); /* baparamset */ 2178 ADDSHORT(frm, args[3]); /* batimeout */ 2179 break; 2180 case IEEE80211_ACTION_BA_DELBA: 2181 /* XXX */ 2182 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 2183 | args[1] 2184 ; 2185 ADDSHORT(frm, baparamset); 2186 ADDSHORT(frm, args[2]); /* reason code */ 2187 2188 IEEE80211_NOTE(vap, 2189 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2190 "send DELBA action: tid %d, initiator %d reason %d", 2191 args[0], args[1], args[2]); 2192 break; 2193 default: 2194 goto badaction; 2195 } 2196 break; 2197 case IEEE80211_ACTION_CAT_HT: 2198 switch (action) { 2199 case IEEE80211_ACTION_HT_TXCHWIDTH: 2200 IEEE80211_NOTE(vap, 2201 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2202 ni, "send HT txchwidth: width %d", 2203 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20 2204 ); 2205 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 2206 IEEE80211_A_HT_TXCHWIDTH_2040 : 2207 IEEE80211_A_HT_TXCHWIDTH_20; 2208 break; 2209 default: 2210 goto badaction; 2211 } 2212 break; 2213 default: 2214 badaction: 2215 IEEE80211_NOTE(vap, 2216 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2217 "%s: unsupported category %d action %d", __func__, 2218 category, action); 2219 senderr(EINVAL, is_tx_unknownmgt); 2220 /* NOTREACHED */ 2221 } 2222 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2223 2224 memset(¶ms, 0, sizeof(params)); 2225 params.ibp_pri = WME_AC_VO; 2226 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 2227 /* NB: we know all frames are unicast */ 2228 params.ibp_try0 = ni->ni_txparms->maxretry; 2229 params.ibp_power = ni->ni_txpower; 2230 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION, 2231 ¶ms); 2232 bad: 2233 ieee80211_free_node(ni); 2234 if (m != NULL) 2235 m_freem(m); 2236 return ret; 2237 #undef ADDSHORT 2238 #undef senderr 2239 } 2240 2241 /* 2242 * Construct the MCS bit mask for inclusion 2243 * in an HT information element. 2244 */ 2245 static void 2246 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2247 { 2248 int i; 2249 2250 for (i = 0; i < rs->rs_nrates; i++) { 2251 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2252 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 2253 /* NB: this assumes a particular implementation */ 2254 setbit(frm, r); 2255 } 2256 } 2257 } 2258 2259 /* 2260 * Add body of an HTCAP information element. 2261 */ 2262 static uint8_t * 2263 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 2264 { 2265 #define ADDSHORT(frm, v) do { \ 2266 frm[0] = (v) & 0xff; \ 2267 frm[1] = (v) >> 8; \ 2268 frm += 2; \ 2269 } while (0) 2270 struct ieee80211vap *vap = ni->ni_vap; 2271 uint16_t caps; 2272 int rxmax, density; 2273 2274 /* HT capabilities */ 2275 caps = vap->iv_htcaps & 0xffff; 2276 /* 2277 * Note channel width depends on whether we are operating as 2278 * a sta or not. When operating as a sta we are generating 2279 * a request based on our desired configuration. Otherwise 2280 * we are operational and the channel attributes identify 2281 * how we've been setup (which might be different if a fixed 2282 * channel is specified). 2283 */ 2284 if (vap->iv_opmode == IEEE80211_M_STA) { 2285 /* override 20/40 use based on config */ 2286 if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) 2287 caps |= IEEE80211_HTCAP_CHWIDTH40; 2288 else 2289 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2290 /* use advertised setting (XXX locally constraint) */ 2291 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 2292 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 2293 } else { 2294 /* override 20/40 use based on current channel */ 2295 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2296 caps |= IEEE80211_HTCAP_CHWIDTH40; 2297 else 2298 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2299 rxmax = vap->iv_ampdu_rxmax; 2300 density = vap->iv_ampdu_density; 2301 } 2302 /* adjust short GI based on channel and config */ 2303 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 2304 caps &= ~IEEE80211_HTCAP_SHORTGI20; 2305 if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 2306 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 2307 caps &= ~IEEE80211_HTCAP_SHORTGI40; 2308 ADDSHORT(frm, caps); 2309 2310 /* HT parameters */ 2311 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 2312 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 2313 ; 2314 frm++; 2315 2316 /* pre-zero remainder of ie */ 2317 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 2318 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 2319 2320 /* supported MCS set */ 2321 /* 2322 * XXX it would better to get the rate set from ni_htrates 2323 * so we can restrict it but for sta mode ni_htrates isn't 2324 * setup when we're called to form an AssocReq frame so for 2325 * now we're restricted to the default HT rate set. 2326 */ 2327 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 2328 2329 frm += sizeof(struct ieee80211_ie_htcap) - 2330 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 2331 return frm; 2332 #undef ADDSHORT 2333 } 2334 2335 /* 2336 * Add 802.11n HT capabilities information element 2337 */ 2338 uint8_t * 2339 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2340 { 2341 frm[0] = IEEE80211_ELEMID_HTCAP; 2342 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2343 return ieee80211_add_htcap_body(frm + 2, ni); 2344 } 2345 2346 /* 2347 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2348 * used for compatibility w/ pre-draft implementations. 2349 */ 2350 uint8_t * 2351 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2352 { 2353 frm[0] = IEEE80211_ELEMID_VENDOR; 2354 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2355 frm[2] = (BCM_OUI >> 0) & 0xff; 2356 frm[3] = (BCM_OUI >> 8) & 0xff; 2357 frm[4] = (BCM_OUI >> 16) & 0xff; 2358 frm[5] = BCM_OUI_HTCAP; 2359 return ieee80211_add_htcap_body(frm + 6, ni); 2360 } 2361 2362 /* 2363 * Construct the MCS bit mask of basic rates 2364 * for inclusion in an HT information element. 2365 */ 2366 static void 2367 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2368 { 2369 int i; 2370 2371 for (i = 0; i < rs->rs_nrates; i++) { 2372 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2373 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2374 r < IEEE80211_HTRATE_MAXSIZE) { 2375 /* NB: this assumes a particular implementation */ 2376 setbit(frm, r); 2377 } 2378 } 2379 } 2380 2381 /* 2382 * Update the HTINFO ie for a beacon frame. 2383 */ 2384 void 2385 ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2386 struct ieee80211_beacon_offsets *bo) 2387 { 2388 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2389 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2390 struct ieee80211com *ic = vap->iv_ic; 2391 struct ieee80211_ie_htinfo *ht = 2392 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2393 2394 /* XXX only update on channel change */ 2395 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2396 if (vap->iv_flags_ext & IEEE80211_FEXT_RIFS) 2397 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM; 2398 else 2399 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2400 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2401 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2402 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2403 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2404 else 2405 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2406 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2407 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2408 2409 /* protection mode */ 2410 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2411 2412 /* XXX propagate to vendor ie's */ 2413 #undef PROTMODE 2414 } 2415 2416 /* 2417 * Add body of an HTINFO information element. 2418 * 2419 * NB: We don't use struct ieee80211_ie_htinfo because we can 2420 * be called to fillin both a standard ie and a compat ie that 2421 * has a vendor OUI at the front. 2422 */ 2423 static uint8_t * 2424 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2425 { 2426 struct ieee80211vap *vap = ni->ni_vap; 2427 struct ieee80211com *ic = ni->ni_ic; 2428 2429 /* pre-zero remainder of ie */ 2430 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2431 2432 /* primary/control channel center */ 2433 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2434 2435 if (vap->iv_flags_ext & IEEE80211_FEXT_RIFS) 2436 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM; 2437 else 2438 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2439 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2440 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2441 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2442 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2443 else 2444 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2445 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2446 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2447 2448 frm[1] = ic->ic_curhtprotmode; 2449 2450 frm += 5; 2451 2452 /* basic MCS set */ 2453 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2454 frm += sizeof(struct ieee80211_ie_htinfo) - 2455 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2456 return frm; 2457 } 2458 2459 /* 2460 * Add 802.11n HT information information element. 2461 */ 2462 uint8_t * 2463 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2464 { 2465 frm[0] = IEEE80211_ELEMID_HTINFO; 2466 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2467 return ieee80211_add_htinfo_body(frm + 2, ni); 2468 } 2469 2470 /* 2471 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2472 * used for compatibility w/ pre-draft implementations. 2473 */ 2474 uint8_t * 2475 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2476 { 2477 frm[0] = IEEE80211_ELEMID_VENDOR; 2478 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2479 frm[2] = (BCM_OUI >> 0) & 0xff; 2480 frm[3] = (BCM_OUI >> 8) & 0xff; 2481 frm[4] = (BCM_OUI >> 16) & 0xff; 2482 frm[5] = BCM_OUI_HTINFO; 2483 return ieee80211_add_htinfo_body(frm + 6, ni); 2484 } 2485