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 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 83 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW, 84 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I", 85 "AMPDU max reorder age (ms)"); 86 #endif 87 88 static int ieee80211_recv_bar_ena = 1; 89 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena, 90 0, "BAR frame processing (ena/dis)"); 91 92 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */ 93 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW, 94 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I", 95 "ADDBA request timeout (ms)"); 96 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */ 97 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW, 98 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I", 99 "ADDBA request backoff (ms)"); 100 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */ 101 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW, 102 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff"); 103 104 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */ 105 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */ 106 107 /* 108 * Setup HT parameters that depends on the clock frequency. 109 */ 110 static void 111 ieee80211_ht_setup(void) 112 { 113 #ifdef IEEE80211_AMPDU_AGE 114 ieee80211_ampdu_age = msecs_to_ticks(500); 115 #endif 116 ieee80211_addba_timeout = msecs_to_ticks(250); 117 ieee80211_addba_backoff = msecs_to_ticks(10*1000); 118 ieee80211_bar_timeout = msecs_to_ticks(250); 119 } 120 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL); 121 122 static int ieee80211_ampdu_enable(struct ieee80211_node *ni, 123 struct ieee80211_tx_ampdu *tap); 124 static int ieee80211_addba_request(struct ieee80211_node *ni, 125 struct ieee80211_tx_ampdu *tap, 126 int dialogtoken, int baparamset, int batimeout); 127 static int ieee80211_addba_response(struct ieee80211_node *ni, 128 struct ieee80211_tx_ampdu *tap, 129 int code, int baparamset, int batimeout); 130 static void ieee80211_addba_stop(struct ieee80211_node *ni, 131 struct ieee80211_tx_ampdu *tap); 132 static void ieee80211_aggr_recv_action(struct ieee80211_node *ni, 133 const uint8_t *frm, const uint8_t *efrm); 134 static void ieee80211_bar_response(struct ieee80211_node *ni, 135 struct ieee80211_tx_ampdu *tap, int status); 136 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap); 137 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap); 138 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *, 139 int baparamset, int batimeout, int baseqctl); 140 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *); 141 142 void 143 ieee80211_ht_attach(struct ieee80211com *ic) 144 { 145 /* setup default aggregation policy */ 146 ic->ic_recv_action = ieee80211_aggr_recv_action; 147 ic->ic_send_action = ieee80211_send_action; 148 ic->ic_ampdu_enable = ieee80211_ampdu_enable; 149 ic->ic_addba_request = ieee80211_addba_request; 150 ic->ic_addba_response = ieee80211_addba_response; 151 ic->ic_addba_stop = ieee80211_addba_stop; 152 ic->ic_bar_response = ieee80211_bar_response; 153 ic->ic_ampdu_rx_start = ampdu_rx_start; 154 ic->ic_ampdu_rx_stop = ampdu_rx_stop; 155 156 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS; 157 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 158 } 159 160 void 161 ieee80211_ht_detach(struct ieee80211com *ic) 162 { 163 } 164 165 void 166 ieee80211_ht_vattach(struct ieee80211vap *vap) 167 { 168 169 /* driver can override defaults */ 170 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 171 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 172 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax; 173 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU; 174 /* tx aggregation traffic thresholds */ 175 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128; 176 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64; 177 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32; 178 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32; 179 180 if (vap->iv_htcaps & IEEE80211_HTC_HT) { 181 /* 182 * Device is HT capable; enable all HT-related 183 * facilities by default. 184 * XXX these choices may be too aggressive. 185 */ 186 vap->iv_flags_ht |= IEEE80211_FHT_HT 187 | IEEE80211_FHT_HTCOMPAT 188 ; 189 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20) 190 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20; 191 /* XXX infer from channel list? */ 192 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 193 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40; 194 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40) 195 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40; 196 } 197 /* enable RIFS if capable */ 198 if (vap->iv_htcaps & IEEE80211_HTC_RIFS) 199 vap->iv_flags_ht |= IEEE80211_FHT_RIFS; 200 201 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 202 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX; 203 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU) 204 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX; 205 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX; 206 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU) 207 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX; 208 } 209 /* NB: disable default legacy WDS, too many issues right now */ 210 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) 211 vap->iv_flags_ht &= ~IEEE80211_FHT_HT; 212 } 213 214 void 215 ieee80211_ht_vdetach(struct ieee80211vap *vap) 216 { 217 } 218 219 static void 220 ht_announce(struct ieee80211com *ic, int mode, 221 const struct ieee80211_htrateset *rs) 222 { 223 struct ifnet *ifp = ic->ic_ifp; 224 int i, rate, mword; 225 226 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]); 227 for (i = 0; i < rs->rs_nrates; i++) { 228 mword = ieee80211_rate2media(ic, 229 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode); 230 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 231 continue; 232 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns; 233 printf("%s%d%sMbps", (i != 0 ? " " : ""), 234 rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); 235 } 236 printf("\n"); 237 } 238 239 void 240 ieee80211_ht_announce(struct ieee80211com *ic) 241 { 242 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 243 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n); 244 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 245 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n); 246 } 247 248 const struct ieee80211_htrateset * 249 ieee80211_get_suphtrates(struct ieee80211com *ic, 250 const struct ieee80211_channel *c) 251 { 252 return &ieee80211_rateset_11n; 253 } 254 255 /* 256 * Receive processing. 257 */ 258 259 /* 260 * Decap the encapsulated A-MSDU frames and dispatch all but 261 * the last for delivery. The last frame is returned for 262 * delivery via the normal path. 263 */ 264 struct mbuf * 265 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 266 { 267 struct ieee80211vap *vap = ni->ni_vap; 268 int framelen; 269 struct mbuf *n; 270 271 /* discard 802.3 header inserted by ieee80211_decap */ 272 m_adj(m, sizeof(struct ether_header)); 273 274 vap->iv_stats.is_amsdu_decap++; 275 276 for (;;) { 277 /* 278 * Decap the first frame, bust it apart from the 279 * remainder and deliver. We leave the last frame 280 * delivery to the caller (for consistency with other 281 * code paths, could also do it here). 282 */ 283 m = ieee80211_decap1(m, &framelen); 284 if (m == NULL) { 285 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 286 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 287 vap->iv_stats.is_amsdu_tooshort++; 288 return NULL; 289 } 290 if (m->m_pkthdr.len == framelen) 291 break; 292 n = m_split(m, framelen, M_NOWAIT); 293 if (n == NULL) { 294 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 295 ni->ni_macaddr, "a-msdu", 296 "%s", "unable to split encapsulated frames"); 297 vap->iv_stats.is_amsdu_split++; 298 m_freem(m); /* NB: must reclaim */ 299 return NULL; 300 } 301 vap->iv_deliver_data(vap, ni, m); 302 303 /* 304 * Remove frame contents; each intermediate frame 305 * is required to be aligned to a 4-byte boundary. 306 */ 307 m = n; 308 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 309 } 310 return m; /* last delivered by caller */ 311 } 312 313 /* 314 * Purge all frames in the A-MPDU re-order queue. 315 */ 316 static void 317 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 318 { 319 struct mbuf *m; 320 int i; 321 322 for (i = 0; i < rap->rxa_wnd; i++) { 323 m = rap->rxa_m[i]; 324 if (m != NULL) { 325 rap->rxa_m[i] = NULL; 326 rap->rxa_qbytes -= m->m_pkthdr.len; 327 m_freem(m); 328 if (--rap->rxa_qframes == 0) 329 break; 330 } 331 } 332 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 333 ("lost %u data, %u frames on ampdu rx q", 334 rap->rxa_qbytes, rap->rxa_qframes)); 335 } 336 337 /* 338 * Start A-MPDU rx/re-order processing for the specified TID. 339 */ 340 static int 341 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap, 342 int baparamset, int batimeout, int baseqctl) 343 { 344 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 345 346 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) { 347 /* 348 * AMPDU previously setup and not terminated with a DELBA, 349 * flush the reorder q's in case anything remains. 350 */ 351 ampdu_rx_purge(rap); 352 } 353 memset(rap, 0, sizeof(*rap)); 354 rap->rxa_wnd = (bufsiz == 0) ? 355 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 356 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START); 357 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND; 358 359 return 0; 360 } 361 362 /* 363 * Stop A-MPDU rx processing for the specified TID. 364 */ 365 static void 366 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 367 { 368 ampdu_rx_purge(rap); 369 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND); 370 } 371 372 /* 373 * Dispatch a frame from the A-MPDU reorder queue. The 374 * frame is fed back into ieee80211_input marked with an 375 * M_AMPDU_MPDU flag so it doesn't come back to us (it also 376 * permits ieee80211_input to optimize re-processing). 377 */ 378 static __inline void 379 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 380 { 381 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */ 382 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */ 383 (void) ieee80211_input(ni, m, 0, 0); 384 } 385 386 /* 387 * Dispatch as many frames as possible from the re-order queue. 388 * Frames will always be "at the front"; we process all frames 389 * up to the first empty slot in the window. On completion we 390 * cleanup state if there are still pending frames in the current 391 * BA window. We assume the frame at slot 0 is already handled 392 * by the caller; we always start at slot 1. 393 */ 394 static void 395 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 396 { 397 struct ieee80211vap *vap = ni->ni_vap; 398 struct mbuf *m; 399 int i; 400 401 /* flush run of frames */ 402 for (i = 1; i < rap->rxa_wnd; i++) { 403 m = rap->rxa_m[i]; 404 if (m == NULL) 405 break; 406 rap->rxa_m[i] = NULL; 407 rap->rxa_qbytes -= m->m_pkthdr.len; 408 rap->rxa_qframes--; 409 410 ampdu_dispatch(ni, m); 411 } 412 /* 413 * If frames remain, copy the mbuf pointers down so 414 * they correspond to the offsets in the new window. 415 */ 416 if (rap->rxa_qframes != 0) { 417 int n = rap->rxa_qframes, j; 418 for (j = i+1; j < rap->rxa_wnd; j++) { 419 if (rap->rxa_m[j] != NULL) { 420 rap->rxa_m[j-i] = rap->rxa_m[j]; 421 rap->rxa_m[j] = NULL; 422 if (--n == 0) 423 break; 424 } 425 } 426 KASSERT(n == 0, ("lost %d frames", n)); 427 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 428 } 429 /* 430 * Adjust the start of the BA window to 431 * reflect the frames just dispatched. 432 */ 433 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 434 vap->iv_stats.is_ampdu_rx_oor += i; 435 } 436 437 #ifdef IEEE80211_AMPDU_AGE 438 /* 439 * Dispatch all frames in the A-MPDU re-order queue. 440 */ 441 static void 442 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 443 { 444 struct ieee80211vap *vap = ni->ni_vap; 445 struct mbuf *m; 446 int i; 447 448 for (i = 0; i < rap->rxa_wnd; i++) { 449 m = rap->rxa_m[i]; 450 if (m == NULL) 451 continue; 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 if (rap->rxa_qframes == 0) 459 break; 460 } 461 } 462 #endif /* IEEE80211_AMPDU_AGE */ 463 464 /* 465 * Dispatch all frames in the A-MPDU re-order queue 466 * preceding the specified sequence number. This logic 467 * handles window moves due to a received MSDU or BAR. 468 */ 469 static void 470 ampdu_rx_flush_upto(struct ieee80211_node *ni, 471 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 472 { 473 struct ieee80211vap *vap = ni->ni_vap; 474 struct mbuf *m; 475 ieee80211_seq seqno; 476 int i; 477 478 /* 479 * Flush any complete MSDU's with a sequence number lower 480 * than winstart. Gaps may exist. Note that we may actually 481 * dispatch frames past winstart if a run continues; this is 482 * an optimization that avoids having to do a separate pass 483 * to dispatch frames after moving the BA window start. 484 */ 485 seqno = rap->rxa_start; 486 for (i = 0; i < rap->rxa_wnd; i++) { 487 m = rap->rxa_m[i]; 488 if (m != NULL) { 489 rap->rxa_m[i] = NULL; 490 rap->rxa_qbytes -= m->m_pkthdr.len; 491 rap->rxa_qframes--; 492 vap->iv_stats.is_ampdu_rx_oor++; 493 494 ampdu_dispatch(ni, m); 495 } else { 496 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 497 break; 498 } 499 seqno = IEEE80211_SEQ_INC(seqno); 500 } 501 /* 502 * If frames remain, copy the mbuf pointers down so 503 * they correspond to the offsets in the new window. 504 */ 505 if (rap->rxa_qframes != 0) { 506 int n = rap->rxa_qframes, j; 507 508 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */ 509 KASSERT(rap->rxa_m[0] == NULL, 510 ("%s: BA window slot 0 occupied", __func__)); 511 for (j = i+1; j < rap->rxa_wnd; j++) { 512 if (rap->rxa_m[j] != NULL) { 513 rap->rxa_m[j-i] = rap->rxa_m[j]; 514 rap->rxa_m[j] = NULL; 515 if (--n == 0) 516 break; 517 } 518 } 519 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 520 "BA win <%d:%d> winstart %d", 521 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 522 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 523 winstart)); 524 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 525 } 526 /* 527 * Move the start of the BA window; we use the 528 * sequence number of the last MSDU that was 529 * passed up the stack+1 or winstart if stopped on 530 * a gap in the reorder buffer. 531 */ 532 rap->rxa_start = seqno; 533 } 534 535 /* 536 * Process a received QoS data frame for an HT station. Handle 537 * A-MPDU reordering: if this frame is received out of order 538 * and falls within the BA window hold onto it. Otherwise if 539 * this frame completes a run, flush any pending frames. We 540 * return 1 if the frame is consumed. A 0 is returned if 541 * the frame should be processed normally by the caller. 542 */ 543 int 544 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 545 { 546 #define IEEE80211_FC0_QOSDATA \ 547 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 548 #define PROCESS 0 /* caller should process frame */ 549 #define CONSUMED 1 /* frame consumed, caller does nothing */ 550 struct ieee80211vap *vap = ni->ni_vap; 551 struct ieee80211_qosframe *wh; 552 struct ieee80211_rx_ampdu *rap; 553 ieee80211_seq rxseq; 554 uint8_t tid; 555 int off; 556 557 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU, 558 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags)); 559 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 560 561 /* NB: m_len known to be sufficient */ 562 wh = mtod(m, struct ieee80211_qosframe *); 563 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) { 564 /* 565 * Not QoS data, shouldn't get here but just 566 * return it to the caller for processing. 567 */ 568 return PROCESS; 569 } 570 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 571 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 572 else 573 tid = wh->i_qos[0]; 574 tid &= IEEE80211_QOS_TID; 575 rap = &ni->ni_rx_ampdu[tid]; 576 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 577 /* 578 * No ADDBA request yet, don't touch. 579 */ 580 return PROCESS; 581 } 582 rxseq = le16toh(*(uint16_t *)wh->i_seq); 583 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) { 584 /* 585 * Fragments are not allowed; toss. 586 */ 587 IEEE80211_DISCARD_MAC(vap, 588 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 589 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid, 590 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 591 vap->iv_stats.is_ampdu_rx_drop++; 592 IEEE80211_NODE_STAT(ni, rx_drop); 593 m_freem(m); 594 return CONSUMED; 595 } 596 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT; 597 rap->rxa_nframes++; 598 again: 599 if (rxseq == rap->rxa_start) { 600 /* 601 * First frame in window. 602 */ 603 if (rap->rxa_qframes != 0) { 604 /* 605 * Dispatch as many packets as we can. 606 */ 607 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 608 ampdu_dispatch(ni, m); 609 ampdu_rx_dispatch(rap, ni); 610 return CONSUMED; 611 } else { 612 /* 613 * In order; advance window and notify 614 * caller to dispatch directly. 615 */ 616 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 617 return PROCESS; 618 } 619 } 620 /* 621 * Frame is out of order; store if in the BA window. 622 */ 623 /* calculate offset in BA window */ 624 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 625 if (off < rap->rxa_wnd) { 626 /* 627 * Common case (hopefully): in the BA window. 628 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 629 */ 630 #ifdef IEEE80211_AMPDU_AGE 631 /* 632 * Check for frames sitting too long in the reorder queue. 633 * This should only ever happen if frames are not delivered 634 * without the sender otherwise notifying us (e.g. with a 635 * BAR to move the window). Typically this happens because 636 * of vendor bugs that cause the sequence number to jump. 637 * When this happens we get a gap in the reorder queue that 638 * leaves frame sitting on the queue until they get pushed 639 * out due to window moves. When the vendor does not send 640 * BAR this move only happens due to explicit packet sends 641 * 642 * NB: we only track the time of the oldest frame in the 643 * reorder q; this means that if we flush we might push 644 * frames that still "new"; if this happens then subsequent 645 * frames will result in BA window moves which cost something 646 * but is still better than a big throughput dip. 647 */ 648 if (rap->rxa_qframes != 0) { 649 /* XXX honor batimeout? */ 650 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 651 /* 652 * Too long since we received the first 653 * frame; flush the reorder buffer. 654 */ 655 if (rap->rxa_qframes != 0) { 656 vap->iv_stats.is_ampdu_rx_age += 657 rap->rxa_qframes; 658 ampdu_rx_flush(ni, rap); 659 } 660 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 661 return PROCESS; 662 } 663 } else { 664 /* 665 * First frame, start aging timer. 666 */ 667 rap->rxa_age = ticks; 668 } 669 #endif /* IEEE80211_AMPDU_AGE */ 670 /* save packet */ 671 if (rap->rxa_m[off] == NULL) { 672 rap->rxa_m[off] = m; 673 rap->rxa_qframes++; 674 rap->rxa_qbytes += m->m_pkthdr.len; 675 vap->iv_stats.is_ampdu_rx_reorder++; 676 } else { 677 IEEE80211_DISCARD_MAC(vap, 678 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 679 ni->ni_macaddr, "a-mpdu duplicate", 680 "seqno %u tid %u BA win <%u:%u>", 681 rxseq, tid, rap->rxa_start, 682 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 683 vap->iv_stats.is_rx_dup++; 684 IEEE80211_NODE_STAT(ni, rx_dup); 685 m_freem(m); 686 } 687 return CONSUMED; 688 } 689 if (off < IEEE80211_SEQ_BA_RANGE) { 690 /* 691 * Outside the BA window, but within range; 692 * flush the reorder q and move the window. 693 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 694 */ 695 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 696 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 697 rap->rxa_start, 698 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 699 rap->rxa_qframes, rxseq, tid); 700 vap->iv_stats.is_ampdu_rx_move++; 701 702 /* 703 * The spec says to flush frames up to but not including: 704 * WinStart_B = rxseq - rap->rxa_wnd + 1 705 * Then insert the frame or notify the caller to process 706 * it immediately. We can safely do this by just starting 707 * over again because we know the frame will now be within 708 * the BA window. 709 */ 710 /* NB: rxa_wnd known to be >0 */ 711 ampdu_rx_flush_upto(ni, rap, 712 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 713 goto again; 714 } else { 715 /* 716 * Outside the BA window and out of range; toss. 717 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 718 */ 719 IEEE80211_DISCARD_MAC(vap, 720 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 721 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 722 rap->rxa_start, 723 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 724 rap->rxa_qframes, rxseq, tid, 725 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 726 vap->iv_stats.is_ampdu_rx_drop++; 727 IEEE80211_NODE_STAT(ni, rx_drop); 728 m_freem(m); 729 return CONSUMED; 730 } 731 #undef CONSUMED 732 #undef PROCESS 733 #undef IEEE80211_FC0_QOSDATA 734 } 735 736 /* 737 * Process a BAR ctl frame. Dispatch all frames up to 738 * the sequence number of the frame. If this frame is 739 * out of range it's discarded. 740 */ 741 void 742 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 743 { 744 struct ieee80211vap *vap = ni->ni_vap; 745 struct ieee80211_frame_bar *wh; 746 struct ieee80211_rx_ampdu *rap; 747 ieee80211_seq rxseq; 748 int tid, off; 749 750 if (!ieee80211_recv_bar_ena) { 751 #if 0 752 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 753 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 754 #endif 755 vap->iv_stats.is_ampdu_bar_bad++; 756 return; 757 } 758 wh = mtod(m0, struct ieee80211_frame_bar *); 759 /* XXX check basic BAR */ 760 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 761 rap = &ni->ni_rx_ampdu[tid]; 762 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 763 /* 764 * No ADDBA request yet, don't touch. 765 */ 766 IEEE80211_DISCARD_MAC(vap, 767 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 768 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 769 vap->iv_stats.is_ampdu_bar_bad++; 770 return; 771 } 772 vap->iv_stats.is_ampdu_bar_rx++; 773 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 774 if (rxseq == rap->rxa_start) 775 return; 776 /* calculate offset in BA window */ 777 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 778 if (off < IEEE80211_SEQ_BA_RANGE) { 779 /* 780 * Flush the reorder q up to rxseq and move the window. 781 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 782 */ 783 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 784 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 785 rap->rxa_start, 786 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 787 rap->rxa_qframes, rxseq, tid); 788 vap->iv_stats.is_ampdu_bar_move++; 789 790 ampdu_rx_flush_upto(ni, rap, rxseq); 791 if (off >= rap->rxa_wnd) { 792 /* 793 * BAR specifies a window start to the right of BA 794 * window; we must move it explicitly since 795 * ampdu_rx_flush_upto will not. 796 */ 797 rap->rxa_start = rxseq; 798 } 799 } else { 800 /* 801 * Out of range; toss. 802 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 803 */ 804 IEEE80211_DISCARD_MAC(vap, 805 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 806 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 807 rap->rxa_start, 808 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 809 rap->rxa_qframes, rxseq, tid, 810 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 811 vap->iv_stats.is_ampdu_bar_oow++; 812 IEEE80211_NODE_STAT(ni, rx_drop); 813 } 814 } 815 816 /* 817 * Setup HT-specific state in a node. Called only 818 * when HT use is negotiated so we don't do extra 819 * work for temporary and/or legacy sta's. 820 */ 821 void 822 ieee80211_ht_node_init(struct ieee80211_node *ni) 823 { 824 struct ieee80211_tx_ampdu *tap; 825 int ac; 826 827 if (ni->ni_flags & IEEE80211_NODE_HT) { 828 /* 829 * Clean AMPDU state on re-associate. This handles the case 830 * where a station leaves w/o notifying us and then returns 831 * before node is reaped for inactivity. 832 */ 833 ieee80211_ht_node_cleanup(ni); 834 } 835 for (ac = 0; ac < WME_NUM_AC; ac++) { 836 tap = &ni->ni_tx_ampdu[ac]; 837 tap->txa_ac = ac; 838 tap->txa_ni = ni; 839 /* NB: further initialization deferred */ 840 } 841 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 842 } 843 844 /* 845 * Cleanup HT-specific state in a node. Called only 846 * when HT use has been marked. 847 */ 848 void 849 ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 850 { 851 struct ieee80211com *ic = ni->ni_ic; 852 int i; 853 854 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 855 856 /* XXX optimize this */ 857 for (i = 0; i < WME_NUM_AC; i++) { 858 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 859 if (tap->txa_flags & IEEE80211_AGGR_SETUP) 860 ampdu_tx_stop(tap); 861 } 862 for (i = 0; i < WME_NUM_TID; i++) 863 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]); 864 865 ni->ni_htcap = 0; 866 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL; 867 } 868 869 /* 870 * Age out HT resources for a station. 871 */ 872 void 873 ieee80211_ht_node_age(struct ieee80211_node *ni) 874 { 875 #ifdef IEEE80211_AMPDU_AGE 876 struct ieee80211vap *vap = ni->ni_vap; 877 uint8_t tid; 878 #endif 879 880 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 881 882 #ifdef IEEE80211_AMPDU_AGE 883 for (tid = 0; tid < WME_NUM_TID; tid++) { 884 struct ieee80211_rx_ampdu *rap; 885 886 rap = &ni->ni_rx_ampdu[tid]; 887 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 888 continue; 889 if (rap->rxa_qframes == 0) 890 continue; 891 /* 892 * Check for frames sitting too long in the reorder queue. 893 * See above for more details on what's happening here. 894 */ 895 /* XXX honor batimeout? */ 896 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 897 /* 898 * Too long since we received the first 899 * frame; flush the reorder buffer. 900 */ 901 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 902 ampdu_rx_flush(ni, rap); 903 } 904 } 905 #endif /* IEEE80211_AMPDU_AGE */ 906 } 907 908 static struct ieee80211_channel * 909 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 910 { 911 return ieee80211_find_channel(ic, c->ic_freq, 912 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 913 } 914 915 /* 916 * Adjust a channel to be HT/non-HT according to the vap's configuration. 917 */ 918 struct ieee80211_channel * 919 ieee80211_ht_adjust_channel(struct ieee80211com *ic, 920 struct ieee80211_channel *chan, int flags) 921 { 922 struct ieee80211_channel *c; 923 924 if (flags & IEEE80211_FHT_HT) { 925 /* promote to HT if possible */ 926 if (flags & IEEE80211_FHT_USEHT40) { 927 if (!IEEE80211_IS_CHAN_HT40(chan)) { 928 /* NB: arbitrarily pick ht40+ over ht40- */ 929 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 930 if (c == NULL) 931 c = findhtchan(ic, chan, 932 IEEE80211_CHAN_HT40D); 933 if (c == NULL) 934 c = findhtchan(ic, chan, 935 IEEE80211_CHAN_HT20); 936 if (c != NULL) 937 chan = c; 938 } 939 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 940 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 941 if (c != NULL) 942 chan = c; 943 } 944 } else if (IEEE80211_IS_CHAN_HT(chan)) { 945 /* demote to legacy, HT use is disabled */ 946 c = ieee80211_find_channel(ic, chan->ic_freq, 947 chan->ic_flags &~ IEEE80211_CHAN_HT); 948 if (c != NULL) 949 chan = c; 950 } 951 return chan; 952 } 953 954 /* 955 * Setup HT-specific state for a legacy WDS peer. 956 */ 957 void 958 ieee80211_ht_wds_init(struct ieee80211_node *ni) 959 { 960 struct ieee80211vap *vap = ni->ni_vap; 961 struct ieee80211_tx_ampdu *tap; 962 int ac; 963 964 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested")); 965 966 /* XXX check scan cache in case peer has an ap and we have info */ 967 /* 968 * If setup with a legacy channel; locate an HT channel. 969 * Otherwise if the inherited channel (from a companion 970 * AP) is suitable use it so we use the same location 971 * for the extension channel). 972 */ 973 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 974 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 975 976 ni->ni_htcap = 0; 977 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) 978 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 979 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 980 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 981 ni->ni_chw = 40; 982 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 983 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 984 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 985 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 986 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) 987 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 988 } else { 989 ni->ni_chw = 20; 990 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 991 } 992 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 993 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 994 ni->ni_flags |= IEEE80211_NODE_RIFS; 995 /* XXX does it make sense to enable SMPS? */ 996 997 ni->ni_htopmode = 0; /* XXX need protection state */ 998 ni->ni_htstbc = 0; /* XXX need info */ 999 1000 for (ac = 0; ac < WME_NUM_AC; ac++) { 1001 tap = &ni->ni_tx_ampdu[ac]; 1002 tap->txa_ac = ac; 1003 } 1004 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */ 1005 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 1006 } 1007 1008 /* 1009 * Notify hostap vaps of a change in the HTINFO ie. 1010 */ 1011 static void 1012 htinfo_notify(struct ieee80211com *ic) 1013 { 1014 struct ieee80211vap *vap; 1015 int first = 1; 1016 1017 IEEE80211_LOCK_ASSERT(ic); 1018 1019 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 1020 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 1021 continue; 1022 if (vap->iv_state != IEEE80211_S_RUN || 1023 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan)) 1024 continue; 1025 if (first) { 1026 IEEE80211_NOTE(vap, 1027 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 1028 vap->iv_bss, 1029 "HT bss occupancy change: %d sta, %d ht, " 1030 "%d ht40%s, HT protmode now 0x%x" 1031 , ic->ic_sta_assoc 1032 , ic->ic_ht_sta_assoc 1033 , ic->ic_ht40_sta_assoc 1034 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ? 1035 ", non-HT sta present" : "" 1036 , ic->ic_curhtprotmode); 1037 first = 0; 1038 } 1039 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 1040 } 1041 } 1042 1043 /* 1044 * Calculate HT protection mode from current 1045 * state and handle updates. 1046 */ 1047 static void 1048 htinfo_update(struct ieee80211com *ic) 1049 { 1050 uint8_t protmode; 1051 1052 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1053 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1054 | IEEE80211_HTINFO_NONHT_PRESENT; 1055 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) { 1056 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1057 | IEEE80211_HTINFO_NONHT_PRESENT; 1058 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1059 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1060 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1061 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1062 } else { 1063 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1064 } 1065 if (protmode != ic->ic_curhtprotmode) { 1066 ic->ic_curhtprotmode = protmode; 1067 htinfo_notify(ic); 1068 } 1069 } 1070 1071 /* 1072 * Handle an HT station joining a BSS. 1073 */ 1074 void 1075 ieee80211_ht_node_join(struct ieee80211_node *ni) 1076 { 1077 struct ieee80211com *ic = ni->ni_ic; 1078 1079 IEEE80211_LOCK_ASSERT(ic); 1080 1081 if (ni->ni_flags & IEEE80211_NODE_HT) { 1082 ic->ic_ht_sta_assoc++; 1083 if (ni->ni_chw == 40) 1084 ic->ic_ht40_sta_assoc++; 1085 } 1086 htinfo_update(ic); 1087 } 1088 1089 /* 1090 * Handle an HT station leaving a BSS. 1091 */ 1092 void 1093 ieee80211_ht_node_leave(struct ieee80211_node *ni) 1094 { 1095 struct ieee80211com *ic = ni->ni_ic; 1096 1097 IEEE80211_LOCK_ASSERT(ic); 1098 1099 if (ni->ni_flags & IEEE80211_NODE_HT) { 1100 ic->ic_ht_sta_assoc--; 1101 if (ni->ni_chw == 40) 1102 ic->ic_ht40_sta_assoc--; 1103 } 1104 htinfo_update(ic); 1105 } 1106 1107 /* 1108 * Public version of htinfo_update; used for processing 1109 * beacon frames from overlapping bss. 1110 * 1111 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1112 * (on receipt of a beacon that advertises MIXED) or 1113 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1114 * from an overlapping legacy bss). We treat MIXED with 1115 * a higher precedence than PROTOPT (i.e. we will not change 1116 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1117 * corresponds to how we handle things in htinfo_update. 1118 */ 1119 void 1120 ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1121 { 1122 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1123 IEEE80211_LOCK(ic); 1124 1125 /* track non-HT station presence */ 1126 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1127 ("protmode 0x%x", protmode)); 1128 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR; 1129 ic->ic_lastnonht = ticks; 1130 1131 if (protmode != ic->ic_curhtprotmode && 1132 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED || 1133 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) { 1134 /* push beacon update */ 1135 ic->ic_curhtprotmode = protmode; 1136 htinfo_notify(ic); 1137 } 1138 IEEE80211_UNLOCK(ic); 1139 #undef OPMODE 1140 } 1141 1142 /* 1143 * Time out presence of an overlapping bss with non-HT 1144 * stations. When operating in hostap mode we listen for 1145 * beacons from other stations and if we identify a non-HT 1146 * station is present we update the opmode field of the 1147 * HTINFO ie. To identify when all non-HT stations are 1148 * gone we time out this condition. 1149 */ 1150 void 1151 ieee80211_ht_timeout(struct ieee80211com *ic) 1152 { 1153 IEEE80211_LOCK_ASSERT(ic); 1154 1155 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) && 1156 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1157 #if 0 1158 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1159 "%s", "time out non-HT STA present on channel"); 1160 #endif 1161 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 1162 htinfo_update(ic); 1163 } 1164 } 1165 1166 /* unalligned little endian access */ 1167 #define LE_READ_2(p) \ 1168 ((uint16_t) \ 1169 ((((const uint8_t *)(p))[0] ) | \ 1170 (((const uint8_t *)(p))[1] << 8))) 1171 1172 /* 1173 * Process an 802.11n HT capabilities ie. 1174 */ 1175 void 1176 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1177 { 1178 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1179 /* 1180 * Station used Vendor OUI ie to associate; 1181 * mark the node so when we respond we'll use 1182 * the Vendor OUI's and not the standard ie's. 1183 */ 1184 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1185 ie += 4; 1186 } else 1187 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1188 1189 ni->ni_htcap = LE_READ_2(ie + 1190 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1191 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1192 } 1193 1194 static void 1195 htinfo_parse(struct ieee80211_node *ni, 1196 const struct ieee80211_ie_htinfo *htinfo) 1197 { 1198 uint16_t w; 1199 1200 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1201 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1202 w = LE_READ_2(&htinfo->hi_byte2); 1203 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1204 w = LE_READ_2(&htinfo->hi_byte45); 1205 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1206 } 1207 1208 /* 1209 * Parse an 802.11n HT info ie and save useful information 1210 * to the node state. Note this does not effect any state 1211 * changes such as for channel width change. 1212 */ 1213 void 1214 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1215 { 1216 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1217 ie += 4; 1218 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie); 1219 } 1220 1221 /* 1222 * Handle 11n channel switch. Use the received HT ie's to 1223 * identify the right channel to use. If we cannot locate it 1224 * in the channel table then fallback to legacy operation. 1225 * Note that we use this information to identify the node's 1226 * channel only; the caller is responsible for insuring any 1227 * required channel change is done (e.g. in sta mode when 1228 * parsing the contents of a beacon frame). 1229 */ 1230 static void 1231 htinfo_update_chw(struct ieee80211_node *ni, int htflags) 1232 { 1233 struct ieee80211com *ic = ni->ni_ic; 1234 struct ieee80211_channel *c; 1235 int chanflags; 1236 1237 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1238 if (chanflags != ni->ni_chan->ic_flags) { 1239 /* XXX not right for ht40- */ 1240 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1241 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1242 /* 1243 * No HT40 channel entry in our table; fall back 1244 * to HT20 operation. This should not happen. 1245 */ 1246 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1247 #if 0 1248 IEEE80211_NOTE(ni->ni_vap, 1249 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1250 "no HT40 channel (freq %u), falling back to HT20", 1251 ni->ni_chan->ic_freq); 1252 #endif 1253 /* XXX stat */ 1254 } 1255 if (c != NULL && c != ni->ni_chan) { 1256 IEEE80211_NOTE(ni->ni_vap, 1257 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1258 "switch station to HT%d channel %u/0x%x", 1259 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1260 c->ic_freq, c->ic_flags); 1261 ni->ni_chan = c; 1262 } 1263 /* NB: caller responsible for forcing any channel change */ 1264 } 1265 /* update node's tx channel width */ 1266 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1267 } 1268 1269 /* 1270 * Update 11n MIMO PS state according to received htcap. 1271 */ 1272 static __inline int 1273 htcap_update_mimo_ps(struct ieee80211_node *ni) 1274 { 1275 uint16_t oflags = ni->ni_flags; 1276 1277 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) { 1278 case IEEE80211_HTCAP_SMPS_DYNAMIC: 1279 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1280 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1281 break; 1282 case IEEE80211_HTCAP_SMPS_ENA: 1283 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1284 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1285 break; 1286 case IEEE80211_HTCAP_SMPS_OFF: 1287 default: /* disable on rx of reserved value */ 1288 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1289 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1290 break; 1291 } 1292 return (oflags ^ ni->ni_flags); 1293 } 1294 1295 /* 1296 * Update short GI state according to received htcap 1297 * and local settings. 1298 */ 1299 static __inline void 1300 htcap_update_shortgi(struct ieee80211_node *ni) 1301 { 1302 struct ieee80211vap *vap = ni->ni_vap; 1303 1304 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40); 1305 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) && 1306 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)) 1307 ni->ni_flags |= IEEE80211_NODE_SGI20; 1308 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) && 1309 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)) 1310 ni->ni_flags |= IEEE80211_NODE_SGI40; 1311 } 1312 1313 /* 1314 * Parse and update HT-related state extracted from 1315 * the HT cap and info ie's. 1316 */ 1317 void 1318 ieee80211_ht_updateparams(struct ieee80211_node *ni, 1319 const uint8_t *htcapie, const uint8_t *htinfoie) 1320 { 1321 struct ieee80211vap *vap = ni->ni_vap; 1322 const struct ieee80211_ie_htinfo *htinfo; 1323 int htflags; 1324 1325 ieee80211_parse_htcap(ni, htcapie); 1326 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1327 htcap_update_mimo_ps(ni); 1328 htcap_update_shortgi(ni); 1329 1330 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR) 1331 htinfoie += 4; 1332 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie; 1333 htinfo_parse(ni, htinfo); 1334 1335 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ? 1336 IEEE80211_CHAN_HT20 : 0; 1337 /* NB: honor operating mode constraint */ 1338 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1339 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) { 1340 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1341 htflags = IEEE80211_CHAN_HT40U; 1342 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1343 htflags = IEEE80211_CHAN_HT40D; 1344 } 1345 htinfo_update_chw(ni, htflags); 1346 1347 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) && 1348 (vap->iv_flags_ht & IEEE80211_FHT_RIFS)) 1349 ni->ni_flags |= IEEE80211_NODE_RIFS; 1350 else 1351 ni->ni_flags &= ~IEEE80211_NODE_RIFS; 1352 } 1353 1354 /* 1355 * Parse and update HT-related state extracted from the HT cap ie 1356 * for a station joining an HT BSS. 1357 */ 1358 void 1359 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie) 1360 { 1361 struct ieee80211vap *vap = ni->ni_vap; 1362 int htflags; 1363 1364 ieee80211_parse_htcap(ni, htcapie); 1365 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1366 htcap_update_mimo_ps(ni); 1367 htcap_update_shortgi(ni); 1368 1369 /* NB: honor operating mode constraint */ 1370 /* XXX 40 MHZ intolerant */ 1371 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ? 1372 IEEE80211_CHAN_HT20 : 0; 1373 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1374 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) { 1375 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan)) 1376 htflags = IEEE80211_CHAN_HT40U; 1377 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan)) 1378 htflags = IEEE80211_CHAN_HT40D; 1379 } 1380 htinfo_update_chw(ni, htflags); 1381 } 1382 1383 /* 1384 * Install received HT rate set by parsing the HT cap ie. 1385 */ 1386 int 1387 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1388 { 1389 struct ieee80211vap *vap = ni->ni_vap; 1390 const struct ieee80211_ie_htcap *htcap; 1391 struct ieee80211_htrateset *rs; 1392 int i; 1393 1394 rs = &ni->ni_htrates; 1395 memset(rs, 0, sizeof(*rs)); 1396 if (ie != NULL) { 1397 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1398 ie += 4; 1399 htcap = (const struct ieee80211_ie_htcap *) ie; 1400 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1401 if (isclr(htcap->hc_mcsset, i)) 1402 continue; 1403 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1404 IEEE80211_NOTE(vap, 1405 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1406 "WARNING, HT rate set too large; only " 1407 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1408 vap->iv_stats.is_rx_rstoobig++; 1409 break; 1410 } 1411 rs->rs_rates[rs->rs_nrates++] = i; 1412 } 1413 } 1414 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1415 } 1416 1417 /* 1418 * Mark rates in a node's HT rate set as basic according 1419 * to the information in the supplied HT info ie. 1420 */ 1421 void 1422 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1423 { 1424 const struct ieee80211_ie_htinfo *htinfo; 1425 struct ieee80211_htrateset *rs; 1426 int i, j; 1427 1428 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1429 ie += 4; 1430 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1431 rs = &ni->ni_htrates; 1432 if (rs->rs_nrates == 0) { 1433 IEEE80211_NOTE(ni->ni_vap, 1434 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1435 "%s", "WARNING, empty HT rate set"); 1436 return; 1437 } 1438 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1439 if (isclr(htinfo->hi_basicmcsset, i)) 1440 continue; 1441 for (j = 0; j < rs->rs_nrates; j++) 1442 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1443 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1444 } 1445 } 1446 1447 static void 1448 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap) 1449 { 1450 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1451 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1452 } 1453 1454 static void 1455 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap) 1456 { 1457 struct ieee80211_node *ni = tap->txa_ni; 1458 struct ieee80211com *ic = ni->ni_ic; 1459 1460 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP, 1461 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac)); 1462 1463 /* 1464 * Stop BA stream if setup so driver has a chance 1465 * to reclaim any resources it might have allocated. 1466 */ 1467 ic->ic_addba_stop(ni, tap); 1468 /* 1469 * Stop any pending BAR transmit. 1470 */ 1471 bar_stop_timer(tap); 1472 1473 tap->txa_lastsample = 0; 1474 tap->txa_avgpps = 0; 1475 /* NB: clearing NAK means we may re-send ADDBA */ 1476 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 1477 } 1478 1479 static void 1480 addba_timeout(void *arg) 1481 { 1482 struct ieee80211_tx_ampdu *tap = arg; 1483 1484 /* XXX ? */ 1485 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1486 tap->txa_attempts++; 1487 } 1488 1489 static void 1490 addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1491 { 1492 /* XXX use CALLOUT_PENDING instead? */ 1493 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1494 addba_timeout, tap); 1495 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1496 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1497 } 1498 1499 static void 1500 addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1501 { 1502 /* XXX use CALLOUT_PENDING instead? */ 1503 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1504 callout_stop(&tap->txa_timer); 1505 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1506 } 1507 } 1508 1509 /* 1510 * Default method for requesting A-MPDU tx aggregation. 1511 * We setup the specified state block and start a timer 1512 * to wait for an ADDBA response frame. 1513 */ 1514 static int 1515 ieee80211_addba_request(struct ieee80211_node *ni, 1516 struct ieee80211_tx_ampdu *tap, 1517 int dialogtoken, int baparamset, int batimeout) 1518 { 1519 int bufsiz; 1520 1521 /* XXX locking */ 1522 tap->txa_token = dialogtoken; 1523 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1524 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1525 tap->txa_wnd = (bufsiz == 0) ? 1526 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1527 addba_start_timeout(tap); 1528 return 1; 1529 } 1530 1531 /* 1532 * Default method for processing an A-MPDU tx aggregation 1533 * response. We shutdown any pending timer and update the 1534 * state block according to the reply. 1535 */ 1536 static int 1537 ieee80211_addba_response(struct ieee80211_node *ni, 1538 struct ieee80211_tx_ampdu *tap, 1539 int status, int baparamset, int batimeout) 1540 { 1541 int bufsiz, tid; 1542 1543 /* XXX locking */ 1544 addba_stop_timeout(tap); 1545 if (status == IEEE80211_STATUS_SUCCESS) { 1546 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1547 /* XXX override our request? */ 1548 tap->txa_wnd = (bufsiz == 0) ? 1549 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1550 /* XXX AC/TID */ 1551 tid = MS(baparamset, IEEE80211_BAPS_TID); 1552 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1553 tap->txa_attempts = 0; 1554 } else { 1555 /* mark tid so we don't try again */ 1556 tap->txa_flags |= IEEE80211_AGGR_NAK; 1557 } 1558 return 1; 1559 } 1560 1561 /* 1562 * Default method for stopping A-MPDU tx aggregation. 1563 * Any timer is cleared and we drain any pending frames. 1564 */ 1565 static void 1566 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1567 { 1568 /* XXX locking */ 1569 addba_stop_timeout(tap); 1570 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1571 /* XXX clear aggregation queue */ 1572 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1573 } 1574 tap->txa_attempts = 0; 1575 } 1576 1577 /* 1578 * Process a received action frame using the default aggregation 1579 * policy. We intercept ADDBA-related frames and use them to 1580 * update our aggregation state. All other frames are passed up 1581 * for processing by ieee80211_recv_action. 1582 */ 1583 static void 1584 ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1585 const uint8_t *frm, const uint8_t *efrm) 1586 { 1587 struct ieee80211com *ic = ni->ni_ic; 1588 struct ieee80211vap *vap = ni->ni_vap; 1589 const struct ieee80211_action *ia; 1590 struct ieee80211_rx_ampdu *rap; 1591 struct ieee80211_tx_ampdu *tap; 1592 uint8_t dialogtoken, policy; 1593 uint16_t baparamset, batimeout, baseqctl, code; 1594 uint16_t args[4]; 1595 int tid, ac, bufsiz; 1596 1597 ia = (const struct ieee80211_action *) frm; 1598 switch (ia->ia_category) { 1599 case IEEE80211_ACTION_CAT_BA: 1600 switch (ia->ia_action) { 1601 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1602 dialogtoken = frm[2]; 1603 baparamset = LE_READ_2(frm+3); 1604 batimeout = LE_READ_2(frm+5); 1605 baseqctl = LE_READ_2(frm+7); 1606 1607 tid = MS(baparamset, IEEE80211_BAPS_TID); 1608 1609 IEEE80211_NOTE(vap, 1610 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1611 "recv ADDBA request: dialogtoken %u " 1612 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1613 "baseqctl %d:%d", 1614 dialogtoken, baparamset, 1615 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ), 1616 batimeout, 1617 MS(baseqctl, IEEE80211_BASEQ_START), 1618 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1619 1620 rap = &ni->ni_rx_ampdu[tid]; 1621 1622 /* Send ADDBA response */ 1623 args[0] = dialogtoken; 1624 /* 1625 * NB: We ack only if the sta associated with HT and 1626 * the ap is configured to do AMPDU rx (the latter 1627 * violates the 11n spec and is mostly for testing). 1628 */ 1629 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1630 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) { 1631 /* XXX handle ampdu_rx_start failure */ 1632 ic->ic_ampdu_rx_start(ni, rap, 1633 baparamset, batimeout, baseqctl); 1634 1635 args[1] = IEEE80211_STATUS_SUCCESS; 1636 } else { 1637 IEEE80211_NOTE(vap, 1638 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1639 ni, "reject ADDBA request: %s", 1640 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1641 "administratively disabled" : 1642 "not negotiated for station"); 1643 vap->iv_stats.is_addba_reject++; 1644 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1645 } 1646 /* XXX honor rap flags? */ 1647 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1648 | SM(tid, IEEE80211_BAPS_TID) 1649 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1650 ; 1651 args[3] = 0; 1652 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1653 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1654 return; 1655 1656 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1657 dialogtoken = frm[2]; 1658 code = LE_READ_2(frm+3); 1659 baparamset = LE_READ_2(frm+5); 1660 tid = MS(baparamset, IEEE80211_BAPS_TID); 1661 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1662 policy = MS(baparamset, IEEE80211_BAPS_POLICY); 1663 batimeout = LE_READ_2(frm+7); 1664 1665 ac = TID_TO_WME_AC(tid); 1666 tap = &ni->ni_tx_ampdu[ac]; 1667 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1668 IEEE80211_DISCARD_MAC(vap, 1669 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1670 ni->ni_macaddr, "ADDBA response", 1671 "no pending ADDBA, tid %d dialogtoken %u " 1672 "code %d", tid, dialogtoken, code); 1673 vap->iv_stats.is_addba_norequest++; 1674 return; 1675 } 1676 if (dialogtoken != tap->txa_token) { 1677 IEEE80211_DISCARD_MAC(vap, 1678 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1679 ni->ni_macaddr, "ADDBA response", 1680 "dialogtoken mismatch: waiting for %d, " 1681 "received %d, tid %d code %d", 1682 tap->txa_token, dialogtoken, tid, code); 1683 vap->iv_stats.is_addba_badtoken++; 1684 return; 1685 } 1686 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */ 1687 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) { 1688 IEEE80211_DISCARD_MAC(vap, 1689 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1690 ni->ni_macaddr, "ADDBA response", 1691 "policy mismatch: expecting %s, " 1692 "received %s, tid %d code %d", 1693 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE, 1694 policy, tid, code); 1695 vap->iv_stats.is_addba_badpolicy++; 1696 return; 1697 } 1698 #if 0 1699 /* XXX we take MIN in ieee80211_addba_response */ 1700 if (bufsiz > IEEE80211_AGGR_BAWMAX) { 1701 IEEE80211_DISCARD_MAC(vap, 1702 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1703 ni->ni_macaddr, "ADDBA response", 1704 "BA window too large: max %d, " 1705 "received %d, tid %d code %d", 1706 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code); 1707 vap->iv_stats.is_addba_badbawinsize++; 1708 return; 1709 } 1710 #endif 1711 IEEE80211_NOTE(vap, 1712 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1713 "recv ADDBA response: dialogtoken %u code %d " 1714 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1715 dialogtoken, code, baparamset, tid, bufsiz, 1716 batimeout); 1717 ic->ic_addba_response(ni, tap, 1718 code, baparamset, batimeout); 1719 return; 1720 1721 case IEEE80211_ACTION_BA_DELBA: 1722 baparamset = LE_READ_2(frm+2); 1723 code = LE_READ_2(frm+4); 1724 1725 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1726 1727 IEEE80211_NOTE(vap, 1728 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1729 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1730 "code %d", baparamset, tid, 1731 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1732 1733 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1734 ac = TID_TO_WME_AC(tid); 1735 tap = &ni->ni_tx_ampdu[ac]; 1736 ic->ic_addba_stop(ni, tap); 1737 } else { 1738 rap = &ni->ni_rx_ampdu[tid]; 1739 ic->ic_ampdu_rx_stop(ni, rap); 1740 } 1741 return; 1742 } 1743 break; 1744 } 1745 ieee80211_recv_action(ni, frm, efrm); 1746 } 1747 1748 /* 1749 * Process a received 802.11n action frame. 1750 * Aggregation-related frames are assumed to be handled 1751 * already; we handle any other frames we can, otherwise 1752 * complain about being unsupported (with debugging). 1753 */ 1754 void 1755 ieee80211_recv_action(struct ieee80211_node *ni, 1756 const uint8_t *frm, const uint8_t *efrm) 1757 { 1758 struct ieee80211vap *vap = ni->ni_vap; 1759 const struct ieee80211_action *ia; 1760 int chw; 1761 1762 ia = (const struct ieee80211_action *) frm; 1763 switch (ia->ia_category) { 1764 case IEEE80211_ACTION_CAT_BA: 1765 IEEE80211_NOTE(vap, 1766 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1767 "%s: BA action %d not implemented", __func__, 1768 ia->ia_action); 1769 vap->iv_stats.is_rx_mgtdiscard++; 1770 break; 1771 case IEEE80211_ACTION_CAT_HT: 1772 switch (ia->ia_action) { 1773 case IEEE80211_ACTION_HT_TXCHWIDTH: 1774 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1775 IEEE80211_NOTE(vap, 1776 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1777 "%s: HT txchwidth, width %d%s", 1778 __func__, chw, ni->ni_chw != chw ? "*" : ""); 1779 if (chw != ni->ni_chw) { 1780 ni->ni_chw = chw; 1781 /* XXX notify on change */ 1782 } 1783 break; 1784 case IEEE80211_ACTION_HT_MIMOPWRSAVE: { 1785 const struct ieee80211_action_ht_mimopowersave *mps = 1786 (const struct ieee80211_action_ht_mimopowersave *) ia; 1787 /* XXX check iv_htcaps */ 1788 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA) 1789 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1790 else 1791 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1792 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE) 1793 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1794 else 1795 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1796 /* XXX notify on change */ 1797 IEEE80211_NOTE(vap, 1798 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1799 "%s: HT MIMO PS (%s%s)", __func__, 1800 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? 1801 "on" : "off", 1802 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? 1803 "+rts" : "" 1804 ); 1805 break; 1806 } 1807 default: 1808 IEEE80211_NOTE(vap, 1809 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1810 "%s: HT action %d not implemented", __func__, 1811 ia->ia_action); 1812 vap->iv_stats.is_rx_mgtdiscard++; 1813 break; 1814 } 1815 break; 1816 default: 1817 IEEE80211_NOTE(vap, 1818 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1819 "%s: category %d not implemented", __func__, 1820 ia->ia_category); 1821 vap->iv_stats.is_rx_mgtdiscard++; 1822 break; 1823 } 1824 } 1825 1826 /* 1827 * Transmit processing. 1828 */ 1829 1830 /* 1831 * Check if A-MPDU should be requested/enabled for a stream. 1832 * We require a traffic rate above a per-AC threshold and we 1833 * also handle backoff from previous failed attempts. 1834 * 1835 * Drivers may override this method to bring in information 1836 * such as link state conditions in making the decision. 1837 */ 1838 static int 1839 ieee80211_ampdu_enable(struct ieee80211_node *ni, 1840 struct ieee80211_tx_ampdu *tap) 1841 { 1842 struct ieee80211vap *vap = ni->ni_vap; 1843 1844 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1845 return 0; 1846 /* XXX check rssi? */ 1847 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1848 ticks < tap->txa_nextrequest) { 1849 /* 1850 * Don't retry too often; txa_nextrequest is set 1851 * to the minimum interval we'll retry after 1852 * ieee80211_addba_maxtries failed attempts are made. 1853 */ 1854 return 0; 1855 } 1856 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1857 "enable AMPDU on %s, avgpps %d pkts %d", 1858 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts); 1859 return 1; 1860 } 1861 1862 /* 1863 * Request A-MPDU tx aggregation. Setup local state and 1864 * issue an ADDBA request. BA use will only happen after 1865 * the other end replies with ADDBA response. 1866 */ 1867 int 1868 ieee80211_ampdu_request(struct ieee80211_node *ni, 1869 struct ieee80211_tx_ampdu *tap) 1870 { 1871 struct ieee80211com *ic = ni->ni_ic; 1872 uint16_t args[4]; 1873 int tid, dialogtoken; 1874 static int tokens = 0; /* XXX */ 1875 1876 /* XXX locking */ 1877 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1878 /* do deferred setup of state */ 1879 ampdu_tx_setup(tap); 1880 } 1881 /* XXX hack for not doing proper locking */ 1882 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1883 1884 dialogtoken = (tokens+1) % 63; /* XXX */ 1885 tid = WME_AC_TO_TID(tap->txa_ac); 1886 tap->txa_start = ni->ni_txseqs[tid]; 1887 1888 args[0] = dialogtoken; 1889 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1890 | SM(tid, IEEE80211_BAPS_TID) 1891 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1892 ; 1893 args[2] = 0; /* batimeout */ 1894 /* NB: do first so there's no race against reply */ 1895 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1896 /* unable to setup state, don't make request */ 1897 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1898 ni, "%s: could not setup BA stream for AC %d", 1899 __func__, tap->txa_ac); 1900 /* defer next try so we don't slam the driver with requests */ 1901 tap->txa_attempts = ieee80211_addba_maxtries; 1902 /* NB: check in case driver wants to override */ 1903 if (tap->txa_nextrequest <= ticks) 1904 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 1905 return 0; 1906 } 1907 tokens = dialogtoken; /* allocate token */ 1908 /* NB: after calling ic_addba_request so driver can set txa_start */ 1909 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START) 1910 | SM(0, IEEE80211_BASEQ_FRAG) 1911 ; 1912 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1913 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1914 } 1915 1916 /* 1917 * Terminate an AMPDU tx stream. State is reclaimed 1918 * and the peer notified with a DelBA Action frame. 1919 */ 1920 void 1921 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap, 1922 int reason) 1923 { 1924 struct ieee80211com *ic = ni->ni_ic; 1925 struct ieee80211vap *vap = ni->ni_vap; 1926 uint16_t args[4]; 1927 1928 /* XXX locking */ 1929 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 1930 if (IEEE80211_AMPDU_RUNNING(tap)) { 1931 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1932 ni, "%s: stop BA stream for AC %d (reason %d)", 1933 __func__, tap->txa_ac, reason); 1934 vap->iv_stats.is_ampdu_stop++; 1935 1936 ic->ic_addba_stop(ni, tap); 1937 args[0] = WME_AC_TO_TID(tap->txa_ac); 1938 args[1] = IEEE80211_DELBAPS_INIT; 1939 args[2] = reason; /* XXX reason code */ 1940 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1941 IEEE80211_ACTION_BA_DELBA, args); 1942 } else { 1943 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1944 ni, "%s: BA stream for AC %d not running (reason %d)", 1945 __func__, tap->txa_ac, reason); 1946 vap->iv_stats.is_ampdu_stop_failed++; 1947 } 1948 } 1949 1950 static void 1951 bar_timeout(void *arg) 1952 { 1953 struct ieee80211_tx_ampdu *tap = arg; 1954 struct ieee80211_node *ni = tap->txa_ni; 1955 1956 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0, 1957 ("bar/addba collision, flags 0x%x", tap->txa_flags)); 1958 1959 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1960 ni, "%s: tid %u flags 0x%x attempts %d", __func__, 1961 tap->txa_ac, tap->txa_flags, tap->txa_attempts); 1962 1963 /* guard against race with bar_tx_complete */ 1964 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 1965 return; 1966 /* XXX ? */ 1967 if (tap->txa_attempts >= ieee80211_bar_maxtries) 1968 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT); 1969 else 1970 ieee80211_send_bar(ni, tap, tap->txa_seqpending); 1971 } 1972 1973 static void 1974 bar_start_timer(struct ieee80211_tx_ampdu *tap) 1975 { 1976 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap); 1977 } 1978 1979 static void 1980 bar_stop_timer(struct ieee80211_tx_ampdu *tap) 1981 { 1982 callout_stop(&tap->txa_timer); 1983 } 1984 1985 static void 1986 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status) 1987 { 1988 struct ieee80211_tx_ampdu *tap = arg; 1989 1990 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 1991 ni, "%s: tid %u flags 0x%x pending %d status %d", 1992 __func__, tap->txa_ac, tap->txa_flags, 1993 callout_pending(&tap->txa_timer), status); 1994 1995 /* XXX locking */ 1996 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) && 1997 callout_pending(&tap->txa_timer)) { 1998 struct ieee80211com *ic = ni->ni_ic; 1999 2000 if (status) /* ACK'd */ 2001 bar_stop_timer(tap); 2002 ic->ic_bar_response(ni, tap, status); 2003 /* NB: just let timer expire so we pace requests */ 2004 } 2005 } 2006 2007 static void 2008 ieee80211_bar_response(struct ieee80211_node *ni, 2009 struct ieee80211_tx_ampdu *tap, int status) 2010 { 2011 2012 if (status != 0) { /* got ACK */ 2013 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2014 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u", 2015 tap->txa_start, 2016 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1), 2017 tap->txa_qframes, tap->txa_seqpending, 2018 WME_AC_TO_TID(tap->txa_ac)); 2019 2020 /* NB: timer already stopped in bar_tx_complete */ 2021 tap->txa_start = tap->txa_seqpending; 2022 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2023 } 2024 } 2025 2026 /* 2027 * Transmit a BAR frame to the specified node. The 2028 * BAR contents are drawn from the supplied aggregation 2029 * state associated with the node. 2030 * 2031 * NB: we only handle immediate ACK w/ compressed bitmap. 2032 */ 2033 int 2034 ieee80211_send_bar(struct ieee80211_node *ni, 2035 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq) 2036 { 2037 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2038 struct ieee80211vap *vap = ni->ni_vap; 2039 struct ieee80211com *ic = ni->ni_ic; 2040 struct ieee80211_frame_bar *bar; 2041 struct mbuf *m; 2042 uint16_t barctl, barseqctl; 2043 uint8_t *frm; 2044 int tid, ret; 2045 2046 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) { 2047 /* no ADDBA response, should not happen */ 2048 /* XXX stat+msg */ 2049 return EINVAL; 2050 } 2051 /* XXX locking */ 2052 bar_stop_timer(tap); 2053 2054 ieee80211_ref_node(ni); 2055 2056 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar)); 2057 if (m == NULL) 2058 senderr(ENOMEM, is_tx_nobuf); 2059 2060 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) { 2061 m_freem(m); 2062 senderr(ENOMEM, is_tx_nobuf); /* XXX */ 2063 /* NOTREACHED */ 2064 } 2065 2066 bar = mtod(m, struct ieee80211_frame_bar *); 2067 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2068 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 2069 bar->i_fc[1] = 0; 2070 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr); 2071 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr); 2072 2073 tid = WME_AC_TO_TID(tap->txa_ac); 2074 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 2075 0 : IEEE80211_BAR_NOACK) 2076 | IEEE80211_BAR_COMP 2077 | SM(tid, IEEE80211_BAR_TID) 2078 ; 2079 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START); 2080 /* NB: known to have proper alignment */ 2081 bar->i_ctl = htole16(barctl); 2082 bar->i_seq = htole16(barseqctl); 2083 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar); 2084 2085 M_WME_SETAC(m, WME_AC_VO); 2086 2087 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 2088 2089 /* XXX locking */ 2090 /* init/bump attempts counter */ 2091 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 2092 tap->txa_attempts = 1; 2093 else 2094 tap->txa_attempts++; 2095 tap->txa_seqpending = seq; 2096 tap->txa_flags |= IEEE80211_AGGR_BARPEND; 2097 2098 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N, 2099 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)", 2100 tid, barctl, seq, tap->txa_attempts); 2101 2102 ret = ic->ic_raw_xmit(ni, m, NULL); 2103 if (ret != 0) { 2104 /* xmit failed, clear state flag */ 2105 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2106 goto bad; 2107 } 2108 /* XXX hack against tx complete happening before timer is started */ 2109 if (tap->txa_flags & IEEE80211_AGGR_BARPEND) 2110 bar_start_timer(tap); 2111 return 0; 2112 bad: 2113 ieee80211_free_node(ni); 2114 return ret; 2115 #undef senderr 2116 } 2117 2118 /* 2119 * Send an action management frame. The arguments are stuff 2120 * into a frame without inspection; the caller is assumed to 2121 * prepare them carefully (e.g. based on the aggregation state). 2122 */ 2123 int 2124 ieee80211_send_action(struct ieee80211_node *ni, 2125 int category, int action, uint16_t args[4]) 2126 { 2127 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2128 #define ADDSHORT(frm, v) do { \ 2129 frm[0] = (v) & 0xff; \ 2130 frm[1] = (v) >> 8; \ 2131 frm += 2; \ 2132 } while (0) 2133 struct ieee80211vap *vap = ni->ni_vap; 2134 struct ieee80211com *ic = ni->ni_ic; 2135 struct ieee80211_bpf_params params; 2136 struct mbuf *m; 2137 uint8_t *frm; 2138 uint16_t baparamset; 2139 int ret; 2140 2141 KASSERT(ni != NULL, ("null node")); 2142 2143 /* 2144 * Hold a reference on the node so it doesn't go away until after 2145 * the xmit is complete all the way in the driver. On error we 2146 * will remove our reference. 2147 */ 2148 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2149 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2150 __func__, __LINE__, 2151 ni, ether_sprintf(ni->ni_macaddr), 2152 ieee80211_node_refcnt(ni)+1); 2153 ieee80211_ref_node(ni); 2154 2155 m = ieee80211_getmgtframe(&frm, 2156 ic->ic_headroom + sizeof(struct ieee80211_frame), 2157 sizeof(uint16_t) /* action+category */ 2158 /* XXX may action payload */ 2159 + sizeof(struct ieee80211_action_ba_addbaresponse) 2160 ); 2161 if (m == NULL) 2162 senderr(ENOMEM, is_tx_nobuf); 2163 2164 *frm++ = category; 2165 *frm++ = action; 2166 switch (category) { 2167 case IEEE80211_ACTION_CAT_BA: 2168 switch (action) { 2169 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 2170 IEEE80211_NOTE(vap, 2171 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2172 "send ADDBA request: dialogtoken %d " 2173 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 2174 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 2175 args[2], args[3]); 2176 2177 *frm++ = args[0]; /* dialog token */ 2178 ADDSHORT(frm, args[1]); /* baparamset */ 2179 ADDSHORT(frm, args[2]); /* batimeout */ 2180 ADDSHORT(frm, args[3]); /* baseqctl */ 2181 break; 2182 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 2183 IEEE80211_NOTE(vap, 2184 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2185 "send ADDBA response: dialogtoken %d status %d " 2186 "baparamset 0x%x (tid %d) batimeout %d", 2187 args[0], args[1], args[2], 2188 MS(args[2], IEEE80211_BAPS_TID), args[3]); 2189 2190 *frm++ = args[0]; /* dialog token */ 2191 ADDSHORT(frm, args[1]); /* statuscode */ 2192 ADDSHORT(frm, args[2]); /* baparamset */ 2193 ADDSHORT(frm, args[3]); /* batimeout */ 2194 break; 2195 case IEEE80211_ACTION_BA_DELBA: 2196 /* XXX */ 2197 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 2198 | args[1] 2199 ; 2200 ADDSHORT(frm, baparamset); 2201 ADDSHORT(frm, args[2]); /* reason code */ 2202 2203 IEEE80211_NOTE(vap, 2204 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2205 "send DELBA action: tid %d, initiator %d reason %d", 2206 args[0], args[1], args[2]); 2207 break; 2208 default: 2209 goto badaction; 2210 } 2211 break; 2212 case IEEE80211_ACTION_CAT_HT: 2213 switch (action) { 2214 case IEEE80211_ACTION_HT_TXCHWIDTH: 2215 IEEE80211_NOTE(vap, 2216 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2217 ni, "send HT txchwidth: width %d", 2218 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20 2219 ); 2220 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 2221 IEEE80211_A_HT_TXCHWIDTH_2040 : 2222 IEEE80211_A_HT_TXCHWIDTH_20; 2223 break; 2224 default: 2225 goto badaction; 2226 } 2227 break; 2228 default: 2229 badaction: 2230 IEEE80211_NOTE(vap, 2231 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2232 "%s: unsupported category %d action %d", __func__, 2233 category, action); 2234 senderr(EINVAL, is_tx_unknownmgt); 2235 /* NOTREACHED */ 2236 } 2237 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2238 2239 memset(¶ms, 0, sizeof(params)); 2240 params.ibp_pri = WME_AC_VO; 2241 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 2242 /* NB: we know all frames are unicast */ 2243 params.ibp_try0 = ni->ni_txparms->maxretry; 2244 params.ibp_power = ni->ni_txpower; 2245 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION, 2246 ¶ms); 2247 bad: 2248 ieee80211_free_node(ni); 2249 if (m != NULL) 2250 m_freem(m); 2251 return ret; 2252 #undef ADDSHORT 2253 #undef senderr 2254 } 2255 2256 /* 2257 * Construct the MCS bit mask for inclusion 2258 * in an HT information element. 2259 */ 2260 static void 2261 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2262 { 2263 int i; 2264 2265 for (i = 0; i < rs->rs_nrates; i++) { 2266 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2267 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 2268 /* NB: this assumes a particular implementation */ 2269 setbit(frm, r); 2270 } 2271 } 2272 } 2273 2274 /* 2275 * Add body of an HTCAP information element. 2276 */ 2277 static uint8_t * 2278 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 2279 { 2280 #define ADDSHORT(frm, v) do { \ 2281 frm[0] = (v) & 0xff; \ 2282 frm[1] = (v) >> 8; \ 2283 frm += 2; \ 2284 } while (0) 2285 struct ieee80211vap *vap = ni->ni_vap; 2286 uint16_t caps; 2287 int rxmax, density; 2288 2289 /* HT capabilities */ 2290 caps = vap->iv_htcaps & 0xffff; 2291 /* 2292 * Note channel width depends on whether we are operating as 2293 * a sta or not. When operating as a sta we are generating 2294 * a request based on our desired configuration. Otherwise 2295 * we are operational and the channel attributes identify 2296 * how we've been setup (which might be different if a fixed 2297 * channel is specified). 2298 */ 2299 if (vap->iv_opmode == IEEE80211_M_STA) { 2300 /* override 20/40 use based on config */ 2301 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40) 2302 caps |= IEEE80211_HTCAP_CHWIDTH40; 2303 else 2304 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2305 /* use advertised setting (XXX locally constraint) */ 2306 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 2307 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 2308 } else { 2309 /* override 20/40 use based on current channel */ 2310 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2311 caps |= IEEE80211_HTCAP_CHWIDTH40; 2312 else 2313 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2314 rxmax = vap->iv_ampdu_rxmax; 2315 density = vap->iv_ampdu_density; 2316 } 2317 /* adjust short GI based on channel and config */ 2318 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0) 2319 caps &= ~IEEE80211_HTCAP_SHORTGI20; 2320 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 || 2321 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 2322 caps &= ~IEEE80211_HTCAP_SHORTGI40; 2323 ADDSHORT(frm, caps); 2324 2325 /* HT parameters */ 2326 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 2327 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 2328 ; 2329 frm++; 2330 2331 /* pre-zero remainder of ie */ 2332 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 2333 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 2334 2335 /* supported MCS set */ 2336 /* 2337 * XXX it would better to get the rate set from ni_htrates 2338 * so we can restrict it but for sta mode ni_htrates isn't 2339 * setup when we're called to form an AssocReq frame so for 2340 * now we're restricted to the default HT rate set. 2341 */ 2342 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 2343 2344 frm += sizeof(struct ieee80211_ie_htcap) - 2345 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 2346 return frm; 2347 #undef ADDSHORT 2348 } 2349 2350 /* 2351 * Add 802.11n HT capabilities information element 2352 */ 2353 uint8_t * 2354 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2355 { 2356 frm[0] = IEEE80211_ELEMID_HTCAP; 2357 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2358 return ieee80211_add_htcap_body(frm + 2, ni); 2359 } 2360 2361 /* 2362 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2363 * used for compatibility w/ pre-draft implementations. 2364 */ 2365 uint8_t * 2366 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2367 { 2368 frm[0] = IEEE80211_ELEMID_VENDOR; 2369 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2370 frm[2] = (BCM_OUI >> 0) & 0xff; 2371 frm[3] = (BCM_OUI >> 8) & 0xff; 2372 frm[4] = (BCM_OUI >> 16) & 0xff; 2373 frm[5] = BCM_OUI_HTCAP; 2374 return ieee80211_add_htcap_body(frm + 6, ni); 2375 } 2376 2377 /* 2378 * Construct the MCS bit mask of basic rates 2379 * for inclusion in an HT information element. 2380 */ 2381 static void 2382 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2383 { 2384 int i; 2385 2386 for (i = 0; i < rs->rs_nrates; i++) { 2387 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2388 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2389 r < IEEE80211_HTRATE_MAXSIZE) { 2390 /* NB: this assumes a particular implementation */ 2391 setbit(frm, r); 2392 } 2393 } 2394 } 2395 2396 /* 2397 * Update the HTINFO ie for a beacon frame. 2398 */ 2399 void 2400 ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2401 struct ieee80211_beacon_offsets *bo) 2402 { 2403 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2404 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2405 struct ieee80211com *ic = vap->iv_ic; 2406 struct ieee80211_ie_htinfo *ht = 2407 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2408 2409 /* XXX only update on channel change */ 2410 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2411 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 2412 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM; 2413 else 2414 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2415 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2416 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2417 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2418 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2419 else 2420 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2421 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2422 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2423 2424 /* protection mode */ 2425 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2426 2427 /* XXX propagate to vendor ie's */ 2428 #undef PROTMODE 2429 } 2430 2431 /* 2432 * Add body of an HTINFO information element. 2433 * 2434 * NB: We don't use struct ieee80211_ie_htinfo because we can 2435 * be called to fillin both a standard ie and a compat ie that 2436 * has a vendor OUI at the front. 2437 */ 2438 static uint8_t * 2439 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2440 { 2441 struct ieee80211vap *vap = ni->ni_vap; 2442 struct ieee80211com *ic = ni->ni_ic; 2443 2444 /* pre-zero remainder of ie */ 2445 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2446 2447 /* primary/control channel center */ 2448 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2449 2450 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 2451 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM; 2452 else 2453 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2454 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2455 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2456 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2457 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2458 else 2459 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2460 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2461 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2462 2463 frm[1] = ic->ic_curhtprotmode; 2464 2465 frm += 5; 2466 2467 /* basic MCS set */ 2468 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2469 frm += sizeof(struct ieee80211_ie_htinfo) - 2470 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2471 return frm; 2472 } 2473 2474 /* 2475 * Add 802.11n HT information information element. 2476 */ 2477 uint8_t * 2478 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2479 { 2480 frm[0] = IEEE80211_ELEMID_HTINFO; 2481 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2482 return ieee80211_add_htinfo_body(frm + 2, ni); 2483 } 2484 2485 /* 2486 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2487 * used for compatibility w/ pre-draft implementations. 2488 */ 2489 uint8_t * 2490 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2491 { 2492 frm[0] = IEEE80211_ELEMID_VENDOR; 2493 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2494 frm[2] = (BCM_OUI >> 0) & 0xff; 2495 frm[3] = (BCM_OUI >> 8) & 0xff; 2496 frm[4] = (BCM_OUI >> 16) & 0xff; 2497 frm[5] = BCM_OUI_HTINFO; 2498 return ieee80211_add_htinfo_body(frm + 6, ni); 2499 } 2500