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_action.h> 51#include <net80211/ieee80211_input.h> 52 53/* define here, used throughout file */ 54#define MS(_v, _f) (((_v) & _f) >> _f##_S) 55#define SM(_v, _f) (((_v) << _f##_S) & _f) 56 57const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = { 58 { 13, 14, 27, 30 }, /* MCS 0 */ 59 { 26, 29, 54, 60 }, /* MCS 1 */ 60 { 39, 43, 81, 90 }, /* MCS 2 */ 61 { 52, 58, 108, 120 }, /* MCS 3 */ 62 { 78, 87, 162, 180 }, /* MCS 4 */ 63 { 104, 116, 216, 240 }, /* MCS 5 */ 64 { 117, 130, 243, 270 }, /* MCS 6 */ 65 { 130, 144, 270, 300 }, /* MCS 7 */ 66 { 26, 29, 54, 60 }, /* MCS 8 */ 67 { 52, 58, 108, 120 }, /* MCS 9 */ 68 { 78, 87, 162, 180 }, /* MCS 10 */ 69 { 104, 116, 216, 240 }, /* MCS 11 */ 70 { 156, 173, 324, 360 }, /* MCS 12 */ 71 { 208, 231, 432, 480 }, /* MCS 13 */ 72 { 234, 260, 486, 540 }, /* MCS 14 */ 73 { 260, 289, 540, 600 }, /* MCS 15 */ 74 { 39, 43, 81, 90 }, /* MCS 16 */ 75 { 78, 87, 162, 180 }, /* MCS 17 */ 76 { 117, 130, 243, 270 }, /* MCS 18 */ 77 { 156, 173, 324, 360 }, /* MCS 19 */ 78 { 234, 260, 486, 540 }, /* MCS 20 */ 79 { 312, 347, 648, 720 }, /* MCS 21 */ 80 { 351, 390, 729, 810 }, /* MCS 22 */ 81 { 390, 433, 810, 900 }, /* MCS 23 */ 82 { 52, 58, 108, 120 }, /* MCS 24 */ 83 { 104, 116, 216, 240 }, /* MCS 25 */ 84 { 156, 173, 324, 360 }, /* MCS 26 */ 85 { 208, 231, 432, 480 }, /* MCS 27 */ 86 { 312, 347, 648, 720 }, /* MCS 28 */ 87 { 416, 462, 864, 960 }, /* MCS 29 */ 88 { 468, 520, 972, 1080 }, /* MCS 30 */ 89 { 520, 578, 1080, 1200 }, /* MCS 31 */ 90 { 0, 0, 12, 13 }, /* MCS 32 */ 91 { 78, 87, 162, 180 }, /* MCS 33 */ 92 { 104, 116, 216, 240 }, /* MCS 34 */ 93 { 130, 144, 270, 300 }, /* MCS 35 */ 94 { 117, 130, 243, 270 }, /* MCS 36 */ 95 { 156, 173, 324, 360 }, /* MCS 37 */ 96 { 195, 217, 405, 450 }, /* MCS 38 */ 97 { 104, 116, 216, 240 }, /* MCS 39 */ 98 { 130, 144, 270, 300 }, /* MCS 40 */ 99 { 130, 144, 270, 300 }, /* MCS 41 */ 100 { 156, 173, 324, 360 }, /* MCS 42 */ 101 { 182, 202, 378, 420 }, /* MCS 43 */ 102 { 182, 202, 378, 420 }, /* MCS 44 */ 103 { 208, 231, 432, 480 }, /* MCS 45 */ 104 { 156, 173, 324, 360 }, /* MCS 46 */ 105 { 195, 217, 405, 450 }, /* MCS 47 */ 106 { 195, 217, 405, 450 }, /* MCS 48 */ 107 { 234, 260, 486, 540 }, /* MCS 49 */ 108 { 273, 303, 567, 630 }, /* MCS 50 */ 109 { 273, 303, 567, 630 }, /* MCS 51 */ 110 { 312, 347, 648, 720 }, /* MCS 52 */ 111 { 130, 144, 270, 300 }, /* MCS 53 */ 112 { 156, 173, 324, 360 }, /* MCS 54 */ 113 { 182, 202, 378, 420 }, /* MCS 55 */ 114 { 156, 173, 324, 360 }, /* MCS 56 */ 115 { 182, 202, 378, 420 }, /* MCS 57 */ 116 { 208, 231, 432, 480 }, /* MCS 58 */ 117 { 234, 260, 486, 540 }, /* MCS 59 */ 118 { 208, 231, 432, 480 }, /* MCS 60 */ 119 { 234, 260, 486, 540 }, /* MCS 61 */ 120 { 260, 289, 540, 600 }, /* MCS 62 */ 121 { 260, 289, 540, 600 }, /* MCS 63 */ 122 { 286, 318, 594, 660 }, /* MCS 64 */ 123 { 195, 217, 405, 450 }, /* MCS 65 */ 124 { 234, 260, 486, 540 }, /* MCS 66 */ 125 { 273, 303, 567, 630 }, /* MCS 67 */ 126 { 234, 260, 486, 540 }, /* MCS 68 */ 127 { 273, 303, 567, 630 }, /* MCS 69 */ 128 { 312, 347, 648, 720 }, /* MCS 70 */ 129 { 351, 390, 729, 810 }, /* MCS 71 */ 130 { 312, 347, 648, 720 }, /* MCS 72 */ 131 { 351, 390, 729, 810 }, /* MCS 73 */ 132 { 390, 433, 810, 900 }, /* MCS 74 */ 133 { 390, 433, 810, 900 }, /* MCS 75 */ 134 { 429, 477, 891, 990 }, /* MCS 76 */ 135}; 136 137#ifdef IEEE80211_AMPDU_AGE 138static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 139SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW, 140 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I", 141 "AMPDU max reorder age (ms)"); 142#endif 143 144static int ieee80211_recv_bar_ena = 1; 145SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena, 146 0, "BAR frame processing (ena/dis)"); 147 148static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */ 149SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW, 150 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I", 151 "ADDBA request timeout (ms)"); 152static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */ 153SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW, 154 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I", 155 "ADDBA request backoff (ms)"); 156static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */ 157SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW, 158 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff"); 159 160static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */ 161static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */ 162 163static ieee80211_recv_action_func ht_recv_action_ba_addba_request; 164static ieee80211_recv_action_func ht_recv_action_ba_addba_response; 165static ieee80211_recv_action_func ht_recv_action_ba_delba; 166static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave; 167static ieee80211_recv_action_func ht_recv_action_ht_txchwidth; 168 169static ieee80211_send_action_func ht_send_action_ba_addba; 170static ieee80211_send_action_func ht_send_action_ba_delba; 171static ieee80211_send_action_func ht_send_action_ht_txchwidth; 172 173static void 174ieee80211_ht_init(void) 175{ 176 /* 177 * Setup HT parameters that depends on the clock frequency. 178 */ 179#ifdef IEEE80211_AMPDU_AGE 180 ieee80211_ampdu_age = msecs_to_ticks(500); 181#endif 182 ieee80211_addba_timeout = msecs_to_ticks(250); 183 ieee80211_addba_backoff = msecs_to_ticks(10*1000); 184 ieee80211_bar_timeout = msecs_to_ticks(250); 185 /* 186 * Register action frame handlers. 187 */ 188 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 189 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request); 190 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 191 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response); 192 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 193 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba); 194 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 195 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave); 196 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 197 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth); 198 199 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 200 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba); 201 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 202 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba); 203 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 204 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba); 205 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT, 206 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth); 207} 208SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL); 209 210static int ieee80211_ampdu_enable(struct ieee80211_node *ni, 211 struct ieee80211_tx_ampdu *tap); 212static int ieee80211_addba_request(struct ieee80211_node *ni, 213 struct ieee80211_tx_ampdu *tap, 214 int dialogtoken, int baparamset, int batimeout); 215static int ieee80211_addba_response(struct ieee80211_node *ni, 216 struct ieee80211_tx_ampdu *tap, 217 int code, int baparamset, int batimeout); 218static void ieee80211_addba_stop(struct ieee80211_node *ni, 219 struct ieee80211_tx_ampdu *tap); 220static void null_addba_response_timeout(struct ieee80211_node *ni, 221 struct ieee80211_tx_ampdu *tap); 222 223static void ieee80211_bar_response(struct ieee80211_node *ni, 224 struct ieee80211_tx_ampdu *tap, int status); 225static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap); 226static void bar_stop_timer(struct ieee80211_tx_ampdu *tap); 227static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *, 228 int baparamset, int batimeout, int baseqctl); 229static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *); 230 231void 232ieee80211_ht_attach(struct ieee80211com *ic) 233{ 234 /* setup default aggregation policy */ 235 ic->ic_recv_action = ieee80211_recv_action; 236 ic->ic_send_action = ieee80211_send_action; 237 ic->ic_ampdu_enable = ieee80211_ampdu_enable; 238 ic->ic_addba_request = ieee80211_addba_request; 239 ic->ic_addba_response = ieee80211_addba_response; 240 ic->ic_addba_response_timeout = null_addba_response_timeout; 241 ic->ic_addba_stop = ieee80211_addba_stop; 242 ic->ic_bar_response = ieee80211_bar_response; 243 ic->ic_ampdu_rx_start = ampdu_rx_start; 244 ic->ic_ampdu_rx_stop = ampdu_rx_stop; 245 246 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS; 247 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 248} 249 250void 251ieee80211_ht_detach(struct ieee80211com *ic) 252{ 253} 254 255void 256ieee80211_ht_vattach(struct ieee80211vap *vap) 257{ 258 259 /* driver can override defaults */ 260 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 261 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 262 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax; 263 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU; 264 /* tx aggregation traffic thresholds */ 265 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128; 266 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64; 267 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32; 268 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32; 269 270 if (vap->iv_htcaps & IEEE80211_HTC_HT) { 271 /* 272 * Device is HT capable; enable all HT-related 273 * facilities by default. 274 * XXX these choices may be too aggressive. 275 */ 276 vap->iv_flags_ht |= IEEE80211_FHT_HT 277 | IEEE80211_FHT_HTCOMPAT 278 ; 279 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20) 280 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20; 281 /* XXX infer from channel list? */ 282 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 283 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40; 284 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40) 285 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40; 286 } 287 /* enable RIFS if capable */ 288 if (vap->iv_htcaps & IEEE80211_HTC_RIFS) 289 vap->iv_flags_ht |= IEEE80211_FHT_RIFS; 290 291 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 292 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX; 293 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU) 294 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX; 295 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX; 296 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU) 297 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX; 298 } 299 /* NB: disable default legacy WDS, too many issues right now */ 300 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) 301 vap->iv_flags_ht &= ~IEEE80211_FHT_HT; 302} 303 304void 305ieee80211_ht_vdetach(struct ieee80211vap *vap) 306{ 307} 308 309static int 310ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode, 311 int ratetype) 312{ 313 int mword, rate; 314 315 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode); 316 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 317 return (0); 318 switch (ratetype) { 319 case 0: 320 rate = ieee80211_htrates[index].ht20_rate_800ns; 321 break; 322 case 1: 323 rate = ieee80211_htrates[index].ht20_rate_400ns; 324 break; 325 case 2: 326 rate = ieee80211_htrates[index].ht40_rate_800ns; 327 break; 328 default: 329 rate = ieee80211_htrates[index].ht40_rate_400ns; 330 break; 331 } 332 return (rate); 333} 334 335static struct printranges { 336 int minmcs; 337 int maxmcs; 338 int txstream; 339 int ratetype; 340 int htcapflags; 341} ranges[] = { 342 { 0, 7, 1, 0, 0 }, 343 { 8, 15, 2, 0, 0 }, 344 { 16, 23, 3, 0, 0 }, 345 { 24, 31, 4, 0, 0 }, 346 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 }, 347 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL }, 348 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL }, 349 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL }, 350 { 0, 0, 0, 0, 0 }, 351}; 352 353static void 354ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype) 355{ 356 struct ifnet *ifp = ic->ic_ifp; 357 int minrate, maxrate; 358 struct printranges *range; 359 360 for (range = ranges; range->txstream != 0; range++) { 361 if (ic->ic_txstream < range->txstream) 362 continue; 363 if (range->htcapflags && 364 (ic->ic_htcaps & range->htcapflags) == 0) 365 continue; 366 if (ratetype < range->ratetype) 367 continue; 368 minrate = ht_getrate(ic, range->minmcs, mode, ratetype); 369 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype); 370 if (range->maxmcs) { 371 if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n", 372 range->minmcs, range->maxmcs, 373 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""), 374 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : "")); 375 } else { 376 if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs, 377 minrate/2, ((minrate & 0x1) != 0 ? ".5" : "")); 378 } 379 } 380} 381 382static void 383ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode) 384{ 385 struct ifnet *ifp = ic->ic_ifp; 386 const char *modestr = ieee80211_phymode_name[mode]; 387 388 if_printf(ifp, "%s MCS 20MHz\n", modestr); 389 ht_rateprint(ic, mode, 0); 390 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) { 391 if_printf(ifp, "%s MCS 20MHz SGI\n", modestr); 392 ht_rateprint(ic, mode, 1); 393 } 394 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 395 if_printf(ifp, "%s MCS 40MHz:\n", modestr); 396 ht_rateprint(ic, mode, 2); 397 } 398 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) && 399 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) { 400 if_printf(ifp, "%s MCS 40MHz SGI:\n", modestr); 401 ht_rateprint(ic, mode, 3); 402 } 403} 404 405void 406ieee80211_ht_announce(struct ieee80211com *ic) 407{ 408 struct ifnet *ifp = ic->ic_ifp; 409 410 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) || 411 isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 412 if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream); 413 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 414 ht_announce(ic, IEEE80211_MODE_11NA); 415 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 416 ht_announce(ic, IEEE80211_MODE_11NG); 417} 418 419static struct ieee80211_htrateset htrateset; 420 421const struct ieee80211_htrateset * 422ieee80211_get_suphtrates(struct ieee80211com *ic, 423 const struct ieee80211_channel *c) 424{ 425#define ADDRATE(x) do { \ 426 htrateset.rs_rates[htrateset.rs_nrates] = x; \ 427 htrateset.rs_nrates++; \ 428} while (0) 429 int i; 430 431 memset(&htrateset, 0, sizeof(struct ieee80211_htrateset)); 432 for (i = 0; i < ic->ic_txstream * 8; i++) 433 ADDRATE(i); 434 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) && 435 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32)) 436 ADDRATE(32); 437 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) { 438 if (ic->ic_txstream >= 2) { 439 for (i = 33; i <= 38; i++) 440 ADDRATE(i); 441 } 442 if (ic->ic_txstream >= 3) { 443 for (i = 39; i <= 52; i++) 444 ADDRATE(i); 445 } 446 if (ic->ic_txstream == 4) { 447 for (i = 53; i <= 76; i++) 448 ADDRATE(i); 449 } 450 } 451 return &htrateset; 452#undef ADDRATE 453} 454 455/* 456 * Receive processing. 457 */ 458 459/* 460 * Decap the encapsulated A-MSDU frames and dispatch all but 461 * the last for delivery. The last frame is returned for 462 * delivery via the normal path. 463 */ 464struct mbuf * 465ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 466{ 467 struct ieee80211vap *vap = ni->ni_vap; 468 int framelen; 469 struct mbuf *n; 470 471 /* discard 802.3 header inserted by ieee80211_decap */ 472 m_adj(m, sizeof(struct ether_header)); 473 474 vap->iv_stats.is_amsdu_decap++; 475 476 for (;;) { 477 /* 478 * Decap the first frame, bust it apart from the 479 * remainder and deliver. We leave the last frame 480 * delivery to the caller (for consistency with other 481 * code paths, could also do it here). 482 */ 483 m = ieee80211_decap1(m, &framelen); 484 if (m == NULL) { 485 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 486 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 487 vap->iv_stats.is_amsdu_tooshort++; 488 return NULL; 489 } 490 if (m->m_pkthdr.len == framelen) 491 break; 492 n = m_split(m, framelen, M_NOWAIT); 493 if (n == NULL) { 494 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 495 ni->ni_macaddr, "a-msdu", 496 "%s", "unable to split encapsulated frames"); 497 vap->iv_stats.is_amsdu_split++; 498 m_freem(m); /* NB: must reclaim */ 499 return NULL; 500 } 501 vap->iv_deliver_data(vap, ni, m); 502 503 /* 504 * Remove frame contents; each intermediate frame 505 * is required to be aligned to a 4-byte boundary. 506 */ 507 m = n; 508 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 509 } 510 return m; /* last delivered by caller */ 511} 512 513/* 514 * Purge all frames in the A-MPDU re-order queue. 515 */ 516static void 517ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 518{ 519 struct mbuf *m; 520 int i; 521 522 for (i = 0; i < rap->rxa_wnd; i++) { 523 m = rap->rxa_m[i]; 524 if (m != NULL) { 525 rap->rxa_m[i] = NULL; 526 rap->rxa_qbytes -= m->m_pkthdr.len; 527 m_freem(m); 528 if (--rap->rxa_qframes == 0) 529 break; 530 } 531 } 532 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 533 ("lost %u data, %u frames on ampdu rx q", 534 rap->rxa_qbytes, rap->rxa_qframes)); 535} 536 537/* 538 * Start A-MPDU rx/re-order processing for the specified TID. 539 */ 540static int 541ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap, 542 int baparamset, int batimeout, int baseqctl) 543{ 544 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 545 546 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) { 547 /* 548 * AMPDU previously setup and not terminated with a DELBA, 549 * flush the reorder q's in case anything remains. 550 */ 551 ampdu_rx_purge(rap); 552 } 553 memset(rap, 0, sizeof(*rap)); 554 rap->rxa_wnd = (bufsiz == 0) ? 555 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 556 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START); 557 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND; 558 559 return 0; 560} 561 562/* 563 * Stop A-MPDU rx processing for the specified TID. 564 */ 565static void 566ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 567{ 568 569 ampdu_rx_purge(rap); 570 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND); 571} 572 573/* 574 * Dispatch a frame from the A-MPDU reorder queue. The 575 * frame is fed back into ieee80211_input marked with an 576 * M_AMPDU_MPDU flag so it doesn't come back to us (it also 577 * permits ieee80211_input to optimize re-processing). 578 */ 579static __inline void 580ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 581{ 582 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */ 583 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */ 584 (void) ieee80211_input(ni, m, 0, 0); 585} 586 587/* 588 * Dispatch as many frames as possible from the re-order queue. 589 * Frames will always be "at the front"; we process all frames 590 * up to the first empty slot in the window. On completion we 591 * cleanup state if there are still pending frames in the current 592 * BA window. We assume the frame at slot 0 is already handled 593 * by the caller; we always start at slot 1. 594 */ 595static void 596ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 597{ 598 struct ieee80211vap *vap = ni->ni_vap; 599 struct mbuf *m; 600 int i; 601 602 /* flush run of frames */ 603 for (i = 1; i < rap->rxa_wnd; i++) { 604 m = rap->rxa_m[i]; 605 if (m == NULL) 606 break; 607 rap->rxa_m[i] = NULL; 608 rap->rxa_qbytes -= m->m_pkthdr.len; 609 rap->rxa_qframes--; 610 611 ampdu_dispatch(ni, m); 612 } 613 /* 614 * If frames remain, copy the mbuf pointers down so 615 * they correspond to the offsets in the new window. 616 */ 617 if (rap->rxa_qframes != 0) { 618 int n = rap->rxa_qframes, j; 619 for (j = i+1; j < rap->rxa_wnd; j++) { 620 if (rap->rxa_m[j] != NULL) { 621 rap->rxa_m[j-i] = rap->rxa_m[j]; 622 rap->rxa_m[j] = NULL; 623 if (--n == 0) 624 break; 625 } 626 } 627 KASSERT(n == 0, ("lost %d frames", n)); 628 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 629 } 630 /* 631 * Adjust the start of the BA window to 632 * reflect the frames just dispatched. 633 */ 634 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 635 vap->iv_stats.is_ampdu_rx_oor += i; 636} 637 638#ifdef IEEE80211_AMPDU_AGE 639/* 640 * Dispatch all frames in the A-MPDU re-order queue. 641 */ 642static void 643ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 644{ 645 struct ieee80211vap *vap = ni->ni_vap; 646 struct mbuf *m; 647 int i; 648 649 for (i = 0; i < rap->rxa_wnd; i++) { 650 m = rap->rxa_m[i]; 651 if (m == NULL) 652 continue; 653 rap->rxa_m[i] = NULL; 654 rap->rxa_qbytes -= m->m_pkthdr.len; 655 rap->rxa_qframes--; 656 vap->iv_stats.is_ampdu_rx_oor++; 657 658 ampdu_dispatch(ni, m); 659 if (rap->rxa_qframes == 0) 660 break; 661 } 662} 663#endif /* IEEE80211_AMPDU_AGE */ 664 665/* 666 * Dispatch all frames in the A-MPDU re-order queue 667 * preceding the specified sequence number. This logic 668 * handles window moves due to a received MSDU or BAR. 669 */ 670static void 671ampdu_rx_flush_upto(struct ieee80211_node *ni, 672 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 673{ 674 struct ieee80211vap *vap = ni->ni_vap; 675 struct mbuf *m; 676 ieee80211_seq seqno; 677 int i; 678 679 /* 680 * Flush any complete MSDU's with a sequence number lower 681 * than winstart. Gaps may exist. Note that we may actually 682 * dispatch frames past winstart if a run continues; this is 683 * an optimization that avoids having to do a separate pass 684 * to dispatch frames after moving the BA window start. 685 */ 686 seqno = rap->rxa_start; 687 for (i = 0; i < rap->rxa_wnd; i++) { 688 m = rap->rxa_m[i]; 689 if (m != NULL) { 690 rap->rxa_m[i] = NULL; 691 rap->rxa_qbytes -= m->m_pkthdr.len; 692 rap->rxa_qframes--; 693 vap->iv_stats.is_ampdu_rx_oor++; 694 695 ampdu_dispatch(ni, m); 696 } else { 697 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 698 break; 699 } 700 seqno = IEEE80211_SEQ_INC(seqno); 701 } 702 /* 703 * If frames remain, copy the mbuf pointers down so 704 * they correspond to the offsets in the new window. 705 */ 706 if (rap->rxa_qframes != 0) { 707 int n = rap->rxa_qframes, j; 708 709 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */ 710 KASSERT(rap->rxa_m[0] == NULL, 711 ("%s: BA window slot 0 occupied", __func__)); 712 for (j = i+1; j < rap->rxa_wnd; j++) { 713 if (rap->rxa_m[j] != NULL) { 714 rap->rxa_m[j-i] = rap->rxa_m[j]; 715 rap->rxa_m[j] = NULL; 716 if (--n == 0) 717 break; 718 } 719 } 720 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 721 "BA win <%d:%d> winstart %d", 722 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 723 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 724 winstart)); 725 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 726 } 727 /* 728 * Move the start of the BA window; we use the 729 * sequence number of the last MSDU that was 730 * passed up the stack+1 or winstart if stopped on 731 * a gap in the reorder buffer. 732 */ 733 rap->rxa_start = seqno; 734} 735 736/* 737 * Process a received QoS data frame for an HT station. Handle 738 * A-MPDU reordering: if this frame is received out of order 739 * and falls within the BA window hold onto it. Otherwise if 740 * this frame completes a run, flush any pending frames. We 741 * return 1 if the frame is consumed. A 0 is returned if 742 * the frame should be processed normally by the caller. 743 */ 744int 745ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 746{ 747#define IEEE80211_FC0_QOSDATA \ 748 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 749#define PROCESS 0 /* caller should process frame */ 750#define CONSUMED 1 /* frame consumed, caller does nothing */ 751 struct ieee80211vap *vap = ni->ni_vap; 752 struct ieee80211_qosframe *wh; 753 struct ieee80211_rx_ampdu *rap; 754 ieee80211_seq rxseq; 755 uint8_t tid; 756 int off; 757 758 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU, 759 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags)); 760 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 761 762 /* NB: m_len known to be sufficient */ 763 wh = mtod(m, struct ieee80211_qosframe *); 764 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) { 765 /* 766 * Not QoS data, shouldn't get here but just 767 * return it to the caller for processing. 768 */ 769 return PROCESS; 770 } 771 if (IEEE80211_IS_DSTODS(wh)) 772 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 773 else 774 tid = wh->i_qos[0]; 775 tid &= IEEE80211_QOS_TID; 776 rap = &ni->ni_rx_ampdu[tid]; 777 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 778 /* 779 * No ADDBA request yet, don't touch. 780 */ 781 return PROCESS; 782 } 783 rxseq = le16toh(*(uint16_t *)wh->i_seq); 784 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) { 785 /* 786 * Fragments are not allowed; toss. 787 */ 788 IEEE80211_DISCARD_MAC(vap, 789 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 790 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid, 791 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 792 vap->iv_stats.is_ampdu_rx_drop++; 793 IEEE80211_NODE_STAT(ni, rx_drop); 794 m_freem(m); 795 return CONSUMED; 796 } 797 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT; 798 rap->rxa_nframes++; 799again: 800 if (rxseq == rap->rxa_start) { 801 /* 802 * First frame in window. 803 */ 804 if (rap->rxa_qframes != 0) { 805 /* 806 * Dispatch as many packets as we can. 807 */ 808 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 809 ampdu_dispatch(ni, m); 810 ampdu_rx_dispatch(rap, ni); 811 return CONSUMED; 812 } else { 813 /* 814 * In order; advance window and notify 815 * caller to dispatch directly. 816 */ 817 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 818 return PROCESS; 819 } 820 } 821 /* 822 * Frame is out of order; store if in the BA window. 823 */ 824 /* calculate offset in BA window */ 825 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 826 if (off < rap->rxa_wnd) { 827 /* 828 * Common case (hopefully): in the BA window. 829 * Sec 9.10.7.6.2 a) (p.137) 830 */ 831#ifdef IEEE80211_AMPDU_AGE 832 /* 833 * Check for frames sitting too long in the reorder queue. 834 * This should only ever happen if frames are not delivered 835 * without the sender otherwise notifying us (e.g. with a 836 * BAR to move the window). Typically this happens because 837 * of vendor bugs that cause the sequence number to jump. 838 * When this happens we get a gap in the reorder queue that 839 * leaves frame sitting on the queue until they get pushed 840 * out due to window moves. When the vendor does not send 841 * BAR this move only happens due to explicit packet sends 842 * 843 * NB: we only track the time of the oldest frame in the 844 * reorder q; this means that if we flush we might push 845 * frames that still "new"; if this happens then subsequent 846 * frames will result in BA window moves which cost something 847 * but is still better than a big throughput dip. 848 */ 849 if (rap->rxa_qframes != 0) { 850 /* XXX honor batimeout? */ 851 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 852 /* 853 * Too long since we received the first 854 * frame; flush the reorder buffer. 855 */ 856 if (rap->rxa_qframes != 0) { 857 vap->iv_stats.is_ampdu_rx_age += 858 rap->rxa_qframes; 859 ampdu_rx_flush(ni, rap); 860 } 861 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 862 return PROCESS; 863 } 864 } else { 865 /* 866 * First frame, start aging timer. 867 */ 868 rap->rxa_age = ticks; 869 } 870#endif /* IEEE80211_AMPDU_AGE */ 871 /* save packet */ 872 if (rap->rxa_m[off] == NULL) { 873 rap->rxa_m[off] = m; 874 rap->rxa_qframes++; 875 rap->rxa_qbytes += m->m_pkthdr.len; 876 vap->iv_stats.is_ampdu_rx_reorder++; 877 } else { 878 IEEE80211_DISCARD_MAC(vap, 879 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 880 ni->ni_macaddr, "a-mpdu duplicate", 881 "seqno %u tid %u BA win <%u:%u>", 882 rxseq, tid, rap->rxa_start, 883 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 884 vap->iv_stats.is_rx_dup++; 885 IEEE80211_NODE_STAT(ni, rx_dup); 886 m_freem(m); 887 } 888 return CONSUMED; 889 } 890 if (off < IEEE80211_SEQ_BA_RANGE) { 891 /* 892 * Outside the BA window, but within range; 893 * flush the reorder q and move the window. 894 * Sec 9.10.7.6.2 b) (p.138) 895 */ 896 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 897 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 898 rap->rxa_start, 899 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 900 rap->rxa_qframes, rxseq, tid); 901 vap->iv_stats.is_ampdu_rx_move++; 902 903 /* 904 * The spec says to flush frames up to but not including: 905 * WinStart_B = rxseq - rap->rxa_wnd + 1 906 * Then insert the frame or notify the caller to process 907 * it immediately. We can safely do this by just starting 908 * over again because we know the frame will now be within 909 * the BA window. 910 */ 911 /* NB: rxa_wnd known to be >0 */ 912 ampdu_rx_flush_upto(ni, rap, 913 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 914 goto again; 915 } else { 916 /* 917 * Outside the BA window and out of range; toss. 918 * Sec 9.10.7.6.2 c) (p.138) 919 */ 920 IEEE80211_DISCARD_MAC(vap, 921 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 922 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 923 rap->rxa_start, 924 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 925 rap->rxa_qframes, rxseq, tid, 926 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 927 vap->iv_stats.is_ampdu_rx_drop++; 928 IEEE80211_NODE_STAT(ni, rx_drop); 929 m_freem(m); 930 return CONSUMED; 931 } 932#undef CONSUMED 933#undef PROCESS 934#undef IEEE80211_FC0_QOSDATA 935} 936 937/* 938 * Process a BAR ctl frame. Dispatch all frames up to 939 * the sequence number of the frame. If this frame is 940 * out of range it's discarded. 941 */ 942void 943ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 944{ 945 struct ieee80211vap *vap = ni->ni_vap; 946 struct ieee80211_frame_bar *wh; 947 struct ieee80211_rx_ampdu *rap; 948 ieee80211_seq rxseq; 949 int tid, off; 950 951 if (!ieee80211_recv_bar_ena) { 952#if 0 953 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 954 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 955#endif 956 vap->iv_stats.is_ampdu_bar_bad++; 957 return; 958 } 959 wh = mtod(m0, struct ieee80211_frame_bar *); 960 /* XXX check basic BAR */ 961 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 962 rap = &ni->ni_rx_ampdu[tid]; 963 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 964 /* 965 * No ADDBA request yet, don't touch. 966 */ 967 IEEE80211_DISCARD_MAC(vap, 968 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 969 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 970 vap->iv_stats.is_ampdu_bar_bad++; 971 return; 972 } 973 vap->iv_stats.is_ampdu_bar_rx++; 974 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 975 if (rxseq == rap->rxa_start) 976 return; 977 /* calculate offset in BA window */ 978 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 979 if (off < IEEE80211_SEQ_BA_RANGE) { 980 /* 981 * Flush the reorder q up to rxseq and move the window. 982 * Sec 9.10.7.6.3 a) (p.138) 983 */ 984 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 985 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 986 rap->rxa_start, 987 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 988 rap->rxa_qframes, rxseq, tid); 989 vap->iv_stats.is_ampdu_bar_move++; 990 991 ampdu_rx_flush_upto(ni, rap, rxseq); 992 if (off >= rap->rxa_wnd) { 993 /* 994 * BAR specifies a window start to the right of BA 995 * window; we must move it explicitly since 996 * ampdu_rx_flush_upto will not. 997 */ 998 rap->rxa_start = rxseq; 999 } 1000 } else { 1001 /* 1002 * Out of range; toss. 1003 * Sec 9.10.7.6.3 b) (p.138) 1004 */ 1005 IEEE80211_DISCARD_MAC(vap, 1006 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 1007 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 1008 rap->rxa_start, 1009 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 1010 rap->rxa_qframes, rxseq, tid, 1011 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 1012 vap->iv_stats.is_ampdu_bar_oow++; 1013 IEEE80211_NODE_STAT(ni, rx_drop); 1014 } 1015} 1016 1017/* 1018 * Setup HT-specific state in a node. Called only 1019 * when HT use is negotiated so we don't do extra 1020 * work for temporary and/or legacy sta's. 1021 */ 1022void 1023ieee80211_ht_node_init(struct ieee80211_node *ni) 1024{ 1025 struct ieee80211_tx_ampdu *tap; 1026 int ac; 1027 1028 if (ni->ni_flags & IEEE80211_NODE_HT) { 1029 /* 1030 * Clean AMPDU state on re-associate. This handles the case 1031 * where a station leaves w/o notifying us and then returns 1032 * before node is reaped for inactivity. 1033 */ 1034 ieee80211_ht_node_cleanup(ni); 1035 } 1036 for (ac = 0; ac < WME_NUM_AC; ac++) { 1037 tap = &ni->ni_tx_ampdu[ac]; 1038 tap->txa_ac = ac; 1039 tap->txa_ni = ni; 1040 /* NB: further initialization deferred */ 1041 } 1042 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 1043} 1044 1045/* 1046 * Cleanup HT-specific state in a node. Called only 1047 * when HT use has been marked. 1048 */ 1049void 1050ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 1051{ 1052 struct ieee80211com *ic = ni->ni_ic; 1053 int i; 1054 1055 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 1056 1057 /* XXX optimize this */ 1058 for (i = 0; i < WME_NUM_AC; i++) { 1059 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 1060 if (tap->txa_flags & IEEE80211_AGGR_SETUP) 1061 ampdu_tx_stop(tap); 1062 } 1063 for (i = 0; i < WME_NUM_TID; i++) 1064 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]); 1065 1066 ni->ni_htcap = 0; 1067 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL; 1068} 1069 1070/* 1071 * Age out HT resources for a station. 1072 */ 1073void 1074ieee80211_ht_node_age(struct ieee80211_node *ni) 1075{ 1076#ifdef IEEE80211_AMPDU_AGE 1077 struct ieee80211vap *vap = ni->ni_vap; 1078 uint8_t tid; 1079#endif 1080 1081 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 1082 1083#ifdef IEEE80211_AMPDU_AGE 1084 for (tid = 0; tid < WME_NUM_TID; tid++) { 1085 struct ieee80211_rx_ampdu *rap; 1086 1087 rap = &ni->ni_rx_ampdu[tid]; 1088 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 1089 continue; 1090 if (rap->rxa_qframes == 0) 1091 continue; 1092 /* 1093 * Check for frames sitting too long in the reorder queue. 1094 * See above for more details on what's happening here. 1095 */ 1096 /* XXX honor batimeout? */ 1097 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 1098 /* 1099 * Too long since we received the first 1100 * frame; flush the reorder buffer. 1101 */ 1102 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 1103 ampdu_rx_flush(ni, rap); 1104 } 1105 } 1106#endif /* IEEE80211_AMPDU_AGE */ 1107} 1108 1109static struct ieee80211_channel * 1110findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 1111{ 1112 return ieee80211_find_channel(ic, c->ic_freq, 1113 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 1114} 1115 1116/* 1117 * Adjust a channel to be HT/non-HT according to the vap's configuration. 1118 */ 1119struct ieee80211_channel * 1120ieee80211_ht_adjust_channel(struct ieee80211com *ic, 1121 struct ieee80211_channel *chan, int flags) 1122{ 1123 struct ieee80211_channel *c; 1124 1125 if (flags & IEEE80211_FHT_HT) { 1126 /* promote to HT if possible */ 1127 if (flags & IEEE80211_FHT_USEHT40) { 1128 if (!IEEE80211_IS_CHAN_HT40(chan)) { 1129 /* NB: arbitrarily pick ht40+ over ht40- */ 1130 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 1131 if (c == NULL) 1132 c = findhtchan(ic, chan, 1133 IEEE80211_CHAN_HT40D); 1134 if (c == NULL) 1135 c = findhtchan(ic, chan, 1136 IEEE80211_CHAN_HT20); 1137 if (c != NULL) 1138 chan = c; 1139 } 1140 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 1141 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 1142 if (c != NULL) 1143 chan = c; 1144 } 1145 } else if (IEEE80211_IS_CHAN_HT(chan)) { 1146 /* demote to legacy, HT use is disabled */ 1147 c = ieee80211_find_channel(ic, chan->ic_freq, 1148 chan->ic_flags &~ IEEE80211_CHAN_HT); 1149 if (c != NULL) 1150 chan = c; 1151 } 1152 return chan; 1153} 1154 1155/* 1156 * Setup HT-specific state for a legacy WDS peer. 1157 */ 1158void 1159ieee80211_ht_wds_init(struct ieee80211_node *ni) 1160{ 1161 struct ieee80211vap *vap = ni->ni_vap; 1162 struct ieee80211_tx_ampdu *tap; 1163 int ac; 1164 1165 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested")); 1166 1167 /* XXX check scan cache in case peer has an ap and we have info */ 1168 /* 1169 * If setup with a legacy channel; locate an HT channel. 1170 * Otherwise if the inherited channel (from a companion 1171 * AP) is suitable use it so we use the same location 1172 * for the extension channel). 1173 */ 1174 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 1175 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 1176 1177 ni->ni_htcap = 0; 1178 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) 1179 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 1180 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 1181 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 1182 ni->ni_chw = 40; 1183 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 1184 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 1185 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 1186 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 1187 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) 1188 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 1189 } else { 1190 ni->ni_chw = 20; 1191 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 1192 } 1193 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 1194 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 1195 ni->ni_flags |= IEEE80211_NODE_RIFS; 1196 /* XXX does it make sense to enable SMPS? */ 1197 1198 ni->ni_htopmode = 0; /* XXX need protection state */ 1199 ni->ni_htstbc = 0; /* XXX need info */ 1200 1201 for (ac = 0; ac < WME_NUM_AC; ac++) { 1202 tap = &ni->ni_tx_ampdu[ac]; 1203 tap->txa_ac = ac; 1204 } 1205 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */ 1206 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 1207} 1208 1209/* 1210 * Notify hostap vaps of a change in the HTINFO ie. 1211 */ 1212static void 1213htinfo_notify(struct ieee80211com *ic) 1214{ 1215 struct ieee80211vap *vap; 1216 int first = 1; 1217 1218 IEEE80211_LOCK_ASSERT(ic); 1219 1220 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 1221 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 1222 continue; 1223 if (vap->iv_state != IEEE80211_S_RUN || 1224 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan)) 1225 continue; 1226 if (first) { 1227 IEEE80211_NOTE(vap, 1228 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 1229 vap->iv_bss, 1230 "HT bss occupancy change: %d sta, %d ht, " 1231 "%d ht40%s, HT protmode now 0x%x" 1232 , ic->ic_sta_assoc 1233 , ic->ic_ht_sta_assoc 1234 , ic->ic_ht40_sta_assoc 1235 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ? 1236 ", non-HT sta present" : "" 1237 , ic->ic_curhtprotmode); 1238 first = 0; 1239 } 1240 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 1241 } 1242} 1243 1244/* 1245 * Calculate HT protection mode from current 1246 * state and handle updates. 1247 */ 1248static void 1249htinfo_update(struct ieee80211com *ic) 1250{ 1251 uint8_t protmode; 1252 1253 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1254 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1255 | IEEE80211_HTINFO_NONHT_PRESENT; 1256 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) { 1257 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1258 | IEEE80211_HTINFO_NONHT_PRESENT; 1259 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1260 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1261 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1262 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1263 } else { 1264 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1265 } 1266 if (protmode != ic->ic_curhtprotmode) { 1267 ic->ic_curhtprotmode = protmode; 1268 htinfo_notify(ic); 1269 } 1270} 1271 1272/* 1273 * Handle an HT station joining a BSS. 1274 */ 1275void 1276ieee80211_ht_node_join(struct ieee80211_node *ni) 1277{ 1278 struct ieee80211com *ic = ni->ni_ic; 1279 1280 IEEE80211_LOCK_ASSERT(ic); 1281 1282 if (ni->ni_flags & IEEE80211_NODE_HT) { 1283 ic->ic_ht_sta_assoc++; 1284 if (ni->ni_chw == 40) 1285 ic->ic_ht40_sta_assoc++; 1286 } 1287 htinfo_update(ic); 1288} 1289 1290/* 1291 * Handle an HT station leaving a BSS. 1292 */ 1293void 1294ieee80211_ht_node_leave(struct ieee80211_node *ni) 1295{ 1296 struct ieee80211com *ic = ni->ni_ic; 1297 1298 IEEE80211_LOCK_ASSERT(ic); 1299 1300 if (ni->ni_flags & IEEE80211_NODE_HT) { 1301 ic->ic_ht_sta_assoc--; 1302 if (ni->ni_chw == 40) 1303 ic->ic_ht40_sta_assoc--; 1304 } 1305 htinfo_update(ic); 1306} 1307 1308/* 1309 * Public version of htinfo_update; used for processing 1310 * beacon frames from overlapping bss. 1311 * 1312 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1313 * (on receipt of a beacon that advertises MIXED) or 1314 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1315 * from an overlapping legacy bss). We treat MIXED with 1316 * a higher precedence than PROTOPT (i.e. we will not change 1317 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1318 * corresponds to how we handle things in htinfo_update. 1319 */ 1320void 1321ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1322{ 1323#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1324 IEEE80211_LOCK(ic); 1325 1326 /* track non-HT station presence */ 1327 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1328 ("protmode 0x%x", protmode)); 1329 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR; 1330 ic->ic_lastnonht = ticks; 1331 1332 if (protmode != ic->ic_curhtprotmode && 1333 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED || 1334 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) { 1335 /* push beacon update */ 1336 ic->ic_curhtprotmode = protmode; 1337 htinfo_notify(ic); 1338 } 1339 IEEE80211_UNLOCK(ic); 1340#undef OPMODE 1341} 1342 1343/* 1344 * Time out presence of an overlapping bss with non-HT 1345 * stations. When operating in hostap mode we listen for 1346 * beacons from other stations and if we identify a non-HT 1347 * station is present we update the opmode field of the 1348 * HTINFO ie. To identify when all non-HT stations are 1349 * gone we time out this condition. 1350 */ 1351void 1352ieee80211_ht_timeout(struct ieee80211com *ic) 1353{ 1354 IEEE80211_LOCK_ASSERT(ic); 1355 1356 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) && 1357 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1358#if 0 1359 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1360 "%s", "time out non-HT STA present on channel"); 1361#endif 1362 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 1363 htinfo_update(ic); 1364 } 1365} 1366 1367/* unalligned little endian access */ 1368#define LE_READ_2(p) \ 1369 ((uint16_t) \ 1370 ((((const uint8_t *)(p))[0] ) | \ 1371 (((const uint8_t *)(p))[1] << 8))) 1372 1373/* 1374 * Process an 802.11n HT capabilities ie. 1375 */ 1376void 1377ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1378{ 1379 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1380 /* 1381 * Station used Vendor OUI ie to associate; 1382 * mark the node so when we respond we'll use 1383 * the Vendor OUI's and not the standard ie's. 1384 */ 1385 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1386 ie += 4; 1387 } else 1388 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1389 1390 ni->ni_htcap = LE_READ_2(ie + 1391 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1392 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1393} 1394 1395static void 1396htinfo_parse(struct ieee80211_node *ni, 1397 const struct ieee80211_ie_htinfo *htinfo) 1398{ 1399 uint16_t w; 1400 1401 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1402 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1403 w = LE_READ_2(&htinfo->hi_byte2); 1404 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1405 w = LE_READ_2(&htinfo->hi_byte45); 1406 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1407} 1408 1409/* 1410 * Parse an 802.11n HT info ie and save useful information 1411 * to the node state. Note this does not effect any state 1412 * changes such as for channel width change. 1413 */ 1414void 1415ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1416{ 1417 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1418 ie += 4; 1419 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie); 1420} 1421 1422/* 1423 * Handle 11n channel switch. Use the received HT ie's to 1424 * identify the right channel to use. If we cannot locate it 1425 * in the channel table then fallback to legacy operation. 1426 * Note that we use this information to identify the node's 1427 * channel only; the caller is responsible for insuring any 1428 * required channel change is done (e.g. in sta mode when 1429 * parsing the contents of a beacon frame). 1430 */ 1431static void 1432htinfo_update_chw(struct ieee80211_node *ni, int htflags) 1433{ 1434 struct ieee80211com *ic = ni->ni_ic; 1435 struct ieee80211_channel *c; 1436 int chanflags; 1437 1438 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1439 if (chanflags != ni->ni_chan->ic_flags) { 1440 /* XXX not right for ht40- */ 1441 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1442 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1443 /* 1444 * No HT40 channel entry in our table; fall back 1445 * to HT20 operation. This should not happen. 1446 */ 1447 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1448#if 0 1449 IEEE80211_NOTE(ni->ni_vap, 1450 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1451 "no HT40 channel (freq %u), falling back to HT20", 1452 ni->ni_chan->ic_freq); 1453#endif 1454 /* XXX stat */ 1455 } 1456 if (c != NULL && c != ni->ni_chan) { 1457 IEEE80211_NOTE(ni->ni_vap, 1458 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1459 "switch station to HT%d channel %u/0x%x", 1460 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1461 c->ic_freq, c->ic_flags); 1462 ni->ni_chan = c; 1463 } 1464 /* NB: caller responsible for forcing any channel change */ 1465 } 1466 /* update node's tx channel width */ 1467 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1468} 1469 1470/* 1471 * Update 11n MIMO PS state according to received htcap. 1472 */ 1473static __inline int 1474htcap_update_mimo_ps(struct ieee80211_node *ni) 1475{ 1476 uint16_t oflags = ni->ni_flags; 1477 1478 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) { 1479 case IEEE80211_HTCAP_SMPS_DYNAMIC: 1480 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1481 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1482 break; 1483 case IEEE80211_HTCAP_SMPS_ENA: 1484 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1485 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1486 break; 1487 case IEEE80211_HTCAP_SMPS_OFF: 1488 default: /* disable on rx of reserved value */ 1489 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1490 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1491 break; 1492 } 1493 return (oflags ^ ni->ni_flags); 1494} 1495 1496/* 1497 * Update short GI state according to received htcap 1498 * and local settings. 1499 */ 1500static __inline void 1501htcap_update_shortgi(struct ieee80211_node *ni) 1502{ 1503 struct ieee80211vap *vap = ni->ni_vap; 1504 1505 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40); 1506 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) && 1507 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)) 1508 ni->ni_flags |= IEEE80211_NODE_SGI20; 1509 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) && 1510 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)) 1511 ni->ni_flags |= IEEE80211_NODE_SGI40; 1512} 1513 1514/* 1515 * Parse and update HT-related state extracted from 1516 * the HT cap and info ie's. 1517 */ 1518void 1519ieee80211_ht_updateparams(struct ieee80211_node *ni, 1520 const uint8_t *htcapie, const uint8_t *htinfoie) 1521{ 1522 struct ieee80211vap *vap = ni->ni_vap; 1523 const struct ieee80211_ie_htinfo *htinfo; 1524 int htflags; 1525 1526 ieee80211_parse_htcap(ni, htcapie); 1527 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1528 htcap_update_mimo_ps(ni); 1529 htcap_update_shortgi(ni); 1530 1531 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR) 1532 htinfoie += 4; 1533 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie; 1534 htinfo_parse(ni, htinfo); 1535 1536 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ? 1537 IEEE80211_CHAN_HT20 : 0; 1538 /* NB: honor operating mode constraint */ 1539 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1540 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) { 1541 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1542 htflags = IEEE80211_CHAN_HT40U; 1543 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1544 htflags = IEEE80211_CHAN_HT40D; 1545 } 1546 htinfo_update_chw(ni, htflags); 1547 1548 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) && 1549 (vap->iv_flags_ht & IEEE80211_FHT_RIFS)) 1550 ni->ni_flags |= IEEE80211_NODE_RIFS; 1551 else 1552 ni->ni_flags &= ~IEEE80211_NODE_RIFS; 1553} 1554 1555/* 1556 * Parse and update HT-related state extracted from the HT cap ie 1557 * for a station joining an HT BSS. 1558 */ 1559void 1560ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie) 1561{ 1562 struct ieee80211vap *vap = ni->ni_vap; 1563 int htflags; 1564 1565 ieee80211_parse_htcap(ni, htcapie); 1566 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1567 htcap_update_mimo_ps(ni); 1568 htcap_update_shortgi(ni); 1569 1570 /* NB: honor operating mode constraint */ 1571 /* XXX 40 MHz intolerant */ 1572 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ? 1573 IEEE80211_CHAN_HT20 : 0; 1574 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1575 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) { 1576 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan)) 1577 htflags = IEEE80211_CHAN_HT40U; 1578 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan)) 1579 htflags = IEEE80211_CHAN_HT40D; 1580 } 1581 htinfo_update_chw(ni, htflags); 1582} 1583 1584/* 1585 * Install received HT rate set by parsing the HT cap ie. 1586 */ 1587int 1588ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1589{ 1590 struct ieee80211com *ic = ni->ni_ic; 1591 struct ieee80211vap *vap = ni->ni_vap; 1592 const struct ieee80211_ie_htcap *htcap; 1593 struct ieee80211_htrateset *rs; 1594 int i, maxequalmcs, maxunequalmcs; 1595 1596 maxequalmcs = ic->ic_txstream * 8 - 1; 1597 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) { 1598 if (ic->ic_txstream >= 2) 1599 maxunequalmcs = 38; 1600 if (ic->ic_txstream >= 3) 1601 maxunequalmcs = 52; 1602 if (ic->ic_txstream >= 4) 1603 maxunequalmcs = 76; 1604 } else 1605 maxunequalmcs = 0; 1606 1607 rs = &ni->ni_htrates; 1608 memset(rs, 0, sizeof(*rs)); 1609 if (ie != NULL) { 1610 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1611 ie += 4; 1612 htcap = (const struct ieee80211_ie_htcap *) ie; 1613 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1614 if (isclr(htcap->hc_mcsset, i)) 1615 continue; 1616 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1617 IEEE80211_NOTE(vap, 1618 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1619 "WARNING, HT rate set too large; only " 1620 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1621 vap->iv_stats.is_rx_rstoobig++; 1622 break; 1623 } 1624 if (i <= 31 && i > maxequalmcs) 1625 continue; 1626 if (i == 32 && 1627 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0) 1628 continue; 1629 if (i > 32 && i > maxunequalmcs) 1630 continue; 1631 rs->rs_rates[rs->rs_nrates++] = i; 1632 } 1633 } 1634 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1635} 1636 1637/* 1638 * Mark rates in a node's HT rate set as basic according 1639 * to the information in the supplied HT info ie. 1640 */ 1641void 1642ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1643{ 1644 const struct ieee80211_ie_htinfo *htinfo; 1645 struct ieee80211_htrateset *rs; 1646 int i, j; 1647 1648 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1649 ie += 4; 1650 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1651 rs = &ni->ni_htrates; 1652 if (rs->rs_nrates == 0) { 1653 IEEE80211_NOTE(ni->ni_vap, 1654 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1655 "%s", "WARNING, empty HT rate set"); 1656 return; 1657 } 1658 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1659 if (isclr(htinfo->hi_basicmcsset, i)) 1660 continue; 1661 for (j = 0; j < rs->rs_nrates; j++) 1662 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1663 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1664 } 1665} 1666 1667static void 1668ampdu_tx_setup(struct ieee80211_tx_ampdu *tap) 1669{ 1670 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1671 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1672} 1673 1674static void 1675ampdu_tx_stop(struct ieee80211_tx_ampdu *tap) 1676{ 1677 struct ieee80211_node *ni = tap->txa_ni; 1678 struct ieee80211com *ic = ni->ni_ic; 1679 1680 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP, 1681 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac)); 1682 1683 /* 1684 * Stop BA stream if setup so driver has a chance 1685 * to reclaim any resources it might have allocated. 1686 */ 1687 ic->ic_addba_stop(ni, tap); 1688 /* 1689 * Stop any pending BAR transmit. 1690 */ 1691 bar_stop_timer(tap); 1692 1693 tap->txa_lastsample = 0; 1694 tap->txa_avgpps = 0; 1695 /* NB: clearing NAK means we may re-send ADDBA */ 1696 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 1697} 1698 1699/* 1700 * ADDBA response timeout. 1701 * 1702 * If software aggregation and per-TID queue management was done here, 1703 * that queue would be unpaused after the ADDBA timeout occurs. 1704 */ 1705static void 1706addba_timeout(void *arg) 1707{ 1708 struct ieee80211_tx_ampdu *tap = arg; 1709 struct ieee80211_node *ni = tap->txa_ni; 1710 struct ieee80211com *ic = ni->ni_ic; 1711 1712 /* XXX ? */ 1713 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1714 tap->txa_attempts++; 1715 ic->ic_addba_response_timeout(ni, tap); 1716} 1717 1718static void 1719addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1720{ 1721 /* XXX use CALLOUT_PENDING instead? */ 1722 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1723 addba_timeout, tap); 1724 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1725 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1726} 1727 1728static void 1729addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1730{ 1731 /* XXX use CALLOUT_PENDING instead? */ 1732 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1733 callout_stop(&tap->txa_timer); 1734 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1735 } 1736} 1737 1738static void 1739null_addba_response_timeout(struct ieee80211_node *ni, 1740 struct ieee80211_tx_ampdu *tap) 1741{ 1742} 1743 1744/* 1745 * Default method for requesting A-MPDU tx aggregation. 1746 * We setup the specified state block and start a timer 1747 * to wait for an ADDBA response frame. 1748 */ 1749static int 1750ieee80211_addba_request(struct ieee80211_node *ni, 1751 struct ieee80211_tx_ampdu *tap, 1752 int dialogtoken, int baparamset, int batimeout) 1753{ 1754 int bufsiz; 1755 1756 /* XXX locking */ 1757 tap->txa_token = dialogtoken; 1758 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1759 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1760 tap->txa_wnd = (bufsiz == 0) ? 1761 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1762 addba_start_timeout(tap); 1763 return 1; 1764} 1765 1766/* 1767 * Default method for processing an A-MPDU tx aggregation 1768 * response. We shutdown any pending timer and update the 1769 * state block according to the reply. 1770 */ 1771static int 1772ieee80211_addba_response(struct ieee80211_node *ni, 1773 struct ieee80211_tx_ampdu *tap, 1774 int status, int baparamset, int batimeout) 1775{ 1776 int bufsiz, tid; 1777 1778 /* XXX locking */ 1779 addba_stop_timeout(tap); 1780 if (status == IEEE80211_STATUS_SUCCESS) { 1781 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1782 /* XXX override our request? */ 1783 tap->txa_wnd = (bufsiz == 0) ? 1784 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1785 /* XXX AC/TID */ 1786 tid = MS(baparamset, IEEE80211_BAPS_TID); 1787 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1788 tap->txa_attempts = 0; 1789 } else { 1790 /* mark tid so we don't try again */ 1791 tap->txa_flags |= IEEE80211_AGGR_NAK; 1792 } 1793 return 1; 1794} 1795 1796/* 1797 * Default method for stopping A-MPDU tx aggregation. 1798 * Any timer is cleared and we drain any pending frames. 1799 */ 1800static void 1801ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1802{ 1803 /* XXX locking */ 1804 addba_stop_timeout(tap); 1805 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1806 /* XXX clear aggregation queue */ 1807 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1808 } 1809 tap->txa_attempts = 0; 1810} 1811 1812/* 1813 * Process a received action frame using the default aggregation 1814 * policy. We intercept ADDBA-related frames and use them to 1815 * update our aggregation state. All other frames are passed up 1816 * for processing by ieee80211_recv_action. 1817 */ 1818static int 1819ht_recv_action_ba_addba_request(struct ieee80211_node *ni, 1820 const struct ieee80211_frame *wh, 1821 const uint8_t *frm, const uint8_t *efrm) 1822{ 1823 struct ieee80211com *ic = ni->ni_ic; 1824 struct ieee80211vap *vap = ni->ni_vap; 1825 struct ieee80211_rx_ampdu *rap; 1826 uint8_t dialogtoken; 1827 uint16_t baparamset, batimeout, baseqctl; 1828 uint16_t args[5]; 1829 int tid; 1830 1831 dialogtoken = frm[2]; 1832 baparamset = LE_READ_2(frm+3); 1833 batimeout = LE_READ_2(frm+5); 1834 baseqctl = LE_READ_2(frm+7); 1835 1836 tid = MS(baparamset, IEEE80211_BAPS_TID); 1837 1838 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1839 "recv ADDBA request: dialogtoken %u baparamset 0x%x " 1840 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d", 1841 dialogtoken, baparamset, 1842 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ), 1843 batimeout, 1844 MS(baseqctl, IEEE80211_BASEQ_START), 1845 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1846 1847 rap = &ni->ni_rx_ampdu[tid]; 1848 1849 /* Send ADDBA response */ 1850 args[0] = dialogtoken; 1851 /* 1852 * NB: We ack only if the sta associated with HT and 1853 * the ap is configured to do AMPDU rx (the latter 1854 * violates the 11n spec and is mostly for testing). 1855 */ 1856 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1857 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) { 1858 /* XXX handle ampdu_rx_start failure */ 1859 ic->ic_ampdu_rx_start(ni, rap, 1860 baparamset, batimeout, baseqctl); 1861 1862 args[1] = IEEE80211_STATUS_SUCCESS; 1863 } else { 1864 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1865 ni, "reject ADDBA request: %s", 1866 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1867 "administratively disabled" : 1868 "not negotiated for station"); 1869 vap->iv_stats.is_addba_reject++; 1870 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1871 } 1872 /* XXX honor rap flags? */ 1873 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1874 | SM(tid, IEEE80211_BAPS_TID) 1875 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1876 ; 1877 args[3] = 0; 1878 args[4] = 0; 1879 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1880 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1881 return 0; 1882} 1883 1884static int 1885ht_recv_action_ba_addba_response(struct ieee80211_node *ni, 1886 const struct ieee80211_frame *wh, 1887 const uint8_t *frm, const uint8_t *efrm) 1888{ 1889 struct ieee80211com *ic = ni->ni_ic; 1890 struct ieee80211vap *vap = ni->ni_vap; 1891 struct ieee80211_tx_ampdu *tap; 1892 uint8_t dialogtoken, policy; 1893 uint16_t baparamset, batimeout, code; 1894 int tid, ac, bufsiz; 1895 1896 dialogtoken = frm[2]; 1897 code = LE_READ_2(frm+3); 1898 baparamset = LE_READ_2(frm+5); 1899 tid = MS(baparamset, IEEE80211_BAPS_TID); 1900 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1901 policy = MS(baparamset, IEEE80211_BAPS_POLICY); 1902 batimeout = LE_READ_2(frm+7); 1903 1904 ac = TID_TO_WME_AC(tid); 1905 tap = &ni->ni_tx_ampdu[ac]; 1906 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1907 IEEE80211_DISCARD_MAC(vap, 1908 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1909 ni->ni_macaddr, "ADDBA response", 1910 "no pending ADDBA, tid %d dialogtoken %u " 1911 "code %d", tid, dialogtoken, code); 1912 vap->iv_stats.is_addba_norequest++; 1913 return 0; 1914 } 1915 if (dialogtoken != tap->txa_token) { 1916 IEEE80211_DISCARD_MAC(vap, 1917 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1918 ni->ni_macaddr, "ADDBA response", 1919 "dialogtoken mismatch: waiting for %d, " 1920 "received %d, tid %d code %d", 1921 tap->txa_token, dialogtoken, tid, code); 1922 vap->iv_stats.is_addba_badtoken++; 1923 return 0; 1924 } 1925 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */ 1926 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) { 1927 IEEE80211_DISCARD_MAC(vap, 1928 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1929 ni->ni_macaddr, "ADDBA response", 1930 "policy mismatch: expecting %s, " 1931 "received %s, tid %d code %d", 1932 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE, 1933 policy, tid, code); 1934 vap->iv_stats.is_addba_badpolicy++; 1935 return 0; 1936 } 1937#if 0 1938 /* XXX we take MIN in ieee80211_addba_response */ 1939 if (bufsiz > IEEE80211_AGGR_BAWMAX) { 1940 IEEE80211_DISCARD_MAC(vap, 1941 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1942 ni->ni_macaddr, "ADDBA response", 1943 "BA window too large: max %d, " 1944 "received %d, tid %d code %d", 1945 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code); 1946 vap->iv_stats.is_addba_badbawinsize++; 1947 return 0; 1948 } 1949#endif 1950 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1951 "recv ADDBA response: dialogtoken %u code %d " 1952 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1953 dialogtoken, code, baparamset, tid, bufsiz, 1954 batimeout); 1955 ic->ic_addba_response(ni, tap, code, baparamset, batimeout); 1956 return 0; 1957} 1958 1959static int 1960ht_recv_action_ba_delba(struct ieee80211_node *ni, 1961 const struct ieee80211_frame *wh, 1962 const uint8_t *frm, const uint8_t *efrm) 1963{ 1964 struct ieee80211com *ic = ni->ni_ic; 1965 struct ieee80211_rx_ampdu *rap; 1966 struct ieee80211_tx_ampdu *tap; 1967 uint16_t baparamset, code; 1968 int tid, ac; 1969 1970 baparamset = LE_READ_2(frm+2); 1971 code = LE_READ_2(frm+4); 1972 1973 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1974 1975 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1976 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1977 "code %d", baparamset, tid, 1978 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1979 1980 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1981 ac = TID_TO_WME_AC(tid); 1982 tap = &ni->ni_tx_ampdu[ac]; 1983 ic->ic_addba_stop(ni, tap); 1984 } else { 1985 rap = &ni->ni_rx_ampdu[tid]; 1986 ic->ic_ampdu_rx_stop(ni, rap); 1987 } 1988 return 0; 1989} 1990 1991static int 1992ht_recv_action_ht_txchwidth(struct ieee80211_node *ni, 1993 const struct ieee80211_frame *wh, 1994 const uint8_t *frm, const uint8_t *efrm) 1995{ 1996 int chw; 1997 1998 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20; 1999 2000 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2001 "%s: HT txchwidth, width %d%s", 2002 __func__, chw, ni->ni_chw != chw ? "*" : ""); 2003 if (chw != ni->ni_chw) { 2004 ni->ni_chw = chw; 2005 /* XXX notify on change */ 2006 } 2007 return 0; 2008} 2009 2010static int 2011ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni, 2012 const struct ieee80211_frame *wh, 2013 const uint8_t *frm, const uint8_t *efrm) 2014{ 2015 const struct ieee80211_action_ht_mimopowersave *mps = 2016 (const struct ieee80211_action_ht_mimopowersave *) frm; 2017 2018 /* XXX check iv_htcaps */ 2019 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA) 2020 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 2021 else 2022 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 2023 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE) 2024 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 2025 else 2026 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 2027 /* XXX notify on change */ 2028 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2029 "%s: HT MIMO PS (%s%s)", __func__, 2030 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off", 2031 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : "" 2032 ); 2033 return 0; 2034} 2035 2036/* 2037 * Transmit processing. 2038 */ 2039 2040/* 2041 * Check if A-MPDU should be requested/enabled for a stream. 2042 * We require a traffic rate above a per-AC threshold and we 2043 * also handle backoff from previous failed attempts. 2044 * 2045 * Drivers may override this method to bring in information 2046 * such as link state conditions in making the decision. 2047 */ 2048static int 2049ieee80211_ampdu_enable(struct ieee80211_node *ni, 2050 struct ieee80211_tx_ampdu *tap) 2051{ 2052 struct ieee80211vap *vap = ni->ni_vap; 2053 2054 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 2055 return 0; 2056 /* XXX check rssi? */ 2057 if (tap->txa_attempts >= ieee80211_addba_maxtries && 2058 ticks < tap->txa_nextrequest) { 2059 /* 2060 * Don't retry too often; txa_nextrequest is set 2061 * to the minimum interval we'll retry after 2062 * ieee80211_addba_maxtries failed attempts are made. 2063 */ 2064 return 0; 2065 } 2066 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 2067 "enable AMPDU on %s, avgpps %d pkts %d", 2068 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts); 2069 return 1; 2070} 2071 2072/* 2073 * Request A-MPDU tx aggregation. Setup local state and 2074 * issue an ADDBA request. BA use will only happen after 2075 * the other end replies with ADDBA response. 2076 */ 2077int 2078ieee80211_ampdu_request(struct ieee80211_node *ni, 2079 struct ieee80211_tx_ampdu *tap) 2080{ 2081 struct ieee80211com *ic = ni->ni_ic; 2082 uint16_t args[5]; 2083 int tid, dialogtoken; 2084 static int tokens = 0; /* XXX */ 2085 2086 /* XXX locking */ 2087 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 2088 /* do deferred setup of state */ 2089 ampdu_tx_setup(tap); 2090 } 2091 /* XXX hack for not doing proper locking */ 2092 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 2093 2094 dialogtoken = (tokens+1) % 63; /* XXX */ 2095 tid = WME_AC_TO_TID(tap->txa_ac); 2096 tap->txa_start = ni->ni_txseqs[tid]; 2097 2098 args[0] = dialogtoken; 2099 args[1] = 0; /* NB: status code not used */ 2100 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 2101 | SM(tid, IEEE80211_BAPS_TID) 2102 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 2103 ; 2104 args[3] = 0; /* batimeout */ 2105 /* NB: do first so there's no race against reply */ 2106 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) { 2107 /* unable to setup state, don't make request */ 2108 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2109 ni, "%s: could not setup BA stream for AC %d", 2110 __func__, tap->txa_ac); 2111 /* defer next try so we don't slam the driver with requests */ 2112 tap->txa_attempts = ieee80211_addba_maxtries; 2113 /* NB: check in case driver wants to override */ 2114 if (tap->txa_nextrequest <= ticks) 2115 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 2116 return 0; 2117 } 2118 tokens = dialogtoken; /* allocate token */ 2119 /* NB: after calling ic_addba_request so driver can set txa_start */ 2120 args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START) 2121 | SM(0, IEEE80211_BASEQ_FRAG) 2122 ; 2123 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 2124 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 2125} 2126 2127/* 2128 * Terminate an AMPDU tx stream. State is reclaimed 2129 * and the peer notified with a DelBA Action frame. 2130 */ 2131void 2132ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap, 2133 int reason) 2134{ 2135 struct ieee80211com *ic = ni->ni_ic; 2136 struct ieee80211vap *vap = ni->ni_vap; 2137 uint16_t args[4]; 2138 2139 /* XXX locking */ 2140 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2141 if (IEEE80211_AMPDU_RUNNING(tap)) { 2142 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2143 ni, "%s: stop BA stream for AC %d (reason %d)", 2144 __func__, tap->txa_ac, reason); 2145 vap->iv_stats.is_ampdu_stop++; 2146 2147 ic->ic_addba_stop(ni, tap); 2148 args[0] = WME_AC_TO_TID(tap->txa_ac); 2149 args[1] = IEEE80211_DELBAPS_INIT; 2150 args[2] = reason; /* XXX reason code */ 2151 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 2152 IEEE80211_ACTION_BA_DELBA, args); 2153 } else { 2154 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2155 ni, "%s: BA stream for AC %d not running (reason %d)", 2156 __func__, tap->txa_ac, reason); 2157 vap->iv_stats.is_ampdu_stop_failed++; 2158 } 2159} 2160 2161static void 2162bar_timeout(void *arg) 2163{ 2164 struct ieee80211_tx_ampdu *tap = arg; 2165 struct ieee80211_node *ni = tap->txa_ni; 2166 2167 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0, 2168 ("bar/addba collision, flags 0x%x", tap->txa_flags)); 2169 2170 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2171 ni, "%s: tid %u flags 0x%x attempts %d", __func__, 2172 tap->txa_ac, tap->txa_flags, tap->txa_attempts); 2173 2174 /* guard against race with bar_tx_complete */ 2175 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 2176 return; 2177 /* XXX ? */ 2178 if (tap->txa_attempts >= ieee80211_bar_maxtries) 2179 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT); 2180 else 2181 ieee80211_send_bar(ni, tap, tap->txa_seqpending); 2182} 2183 2184static void 2185bar_start_timer(struct ieee80211_tx_ampdu *tap) 2186{ 2187 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap); 2188} 2189 2190static void 2191bar_stop_timer(struct ieee80211_tx_ampdu *tap) 2192{ 2193 callout_stop(&tap->txa_timer); 2194} 2195 2196static void 2197bar_tx_complete(struct ieee80211_node *ni, void *arg, int status) 2198{ 2199 struct ieee80211_tx_ampdu *tap = arg; 2200 2201 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2202 ni, "%s: tid %u flags 0x%x pending %d status %d", 2203 __func__, tap->txa_ac, tap->txa_flags, 2204 callout_pending(&tap->txa_timer), status); 2205 2206 /* XXX locking */ 2207 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) && 2208 callout_pending(&tap->txa_timer)) { 2209 struct ieee80211com *ic = ni->ni_ic; 2210 2211 if (status == 0) /* ACK'd */ 2212 bar_stop_timer(tap); 2213 ic->ic_bar_response(ni, tap, status); 2214 /* NB: just let timer expire so we pace requests */ 2215 } 2216} 2217 2218static void 2219ieee80211_bar_response(struct ieee80211_node *ni, 2220 struct ieee80211_tx_ampdu *tap, int status) 2221{ 2222 2223 if (status == 0) { /* got ACK */ 2224 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2225 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u", 2226 tap->txa_start, 2227 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1), 2228 tap->txa_qframes, tap->txa_seqpending, 2229 WME_AC_TO_TID(tap->txa_ac)); 2230 2231 /* NB: timer already stopped in bar_tx_complete */ 2232 tap->txa_start = tap->txa_seqpending; 2233 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2234 } 2235} 2236 2237/* 2238 * Transmit a BAR frame to the specified node. The 2239 * BAR contents are drawn from the supplied aggregation 2240 * state associated with the node. 2241 * 2242 * NB: we only handle immediate ACK w/ compressed bitmap. 2243 */ 2244int 2245ieee80211_send_bar(struct ieee80211_node *ni, 2246 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq) 2247{ 2248#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2249 struct ieee80211vap *vap = ni->ni_vap; 2250 struct ieee80211com *ic = ni->ni_ic; 2251 struct ieee80211_frame_bar *bar; 2252 struct mbuf *m; 2253 uint16_t barctl, barseqctl; 2254 uint8_t *frm; 2255 int tid, ret; 2256 2257 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) { 2258 /* no ADDBA response, should not happen */ 2259 /* XXX stat+msg */ 2260 return EINVAL; 2261 } 2262 /* XXX locking */ 2263 bar_stop_timer(tap); 2264 2265 ieee80211_ref_node(ni); 2266 2267 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar)); 2268 if (m == NULL) 2269 senderr(ENOMEM, is_tx_nobuf); 2270 2271 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) { 2272 m_freem(m); 2273 senderr(ENOMEM, is_tx_nobuf); /* XXX */ 2274 /* NOTREACHED */ 2275 } 2276 2277 bar = mtod(m, struct ieee80211_frame_bar *); 2278 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2279 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 2280 bar->i_fc[1] = 0; 2281 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr); 2282 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr); 2283 2284 tid = WME_AC_TO_TID(tap->txa_ac); 2285 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 2286 0 : IEEE80211_BAR_NOACK) 2287 | IEEE80211_BAR_COMP 2288 | SM(tid, IEEE80211_BAR_TID) 2289 ; 2290 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START); 2291 /* NB: known to have proper alignment */ 2292 bar->i_ctl = htole16(barctl); 2293 bar->i_seq = htole16(barseqctl); 2294 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar); 2295 2296 M_WME_SETAC(m, WME_AC_VO); 2297 2298 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 2299 2300 /* XXX locking */ 2301 /* init/bump attempts counter */ 2302 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 2303 tap->txa_attempts = 1; 2304 else 2305 tap->txa_attempts++; 2306 tap->txa_seqpending = seq; 2307 tap->txa_flags |= IEEE80211_AGGR_BARPEND; 2308 2309 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N, 2310 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)", 2311 tid, barctl, seq, tap->txa_attempts); 2312 2313 /* 2314 * ic_raw_xmit will free the node reference 2315 * regardless of queue/TX success or failure. 2316 */ 2317 ret = ic->ic_raw_xmit(ni, m, NULL); 2318 if (ret != 0) { 2319 /* xmit failed, clear state flag */ 2320 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2321 return ret; 2322 } 2323 /* XXX hack against tx complete happening before timer is started */ 2324 if (tap->txa_flags & IEEE80211_AGGR_BARPEND) 2325 bar_start_timer(tap); 2326 return 0; 2327bad: 2328 ieee80211_free_node(ni); 2329 return ret; 2330#undef senderr 2331} 2332 2333static int 2334ht_action_output(struct ieee80211_node *ni, struct mbuf *m) 2335{ 2336 struct ieee80211_bpf_params params; 2337 2338 memset(¶ms, 0, sizeof(params)); 2339 params.ibp_pri = WME_AC_VO; 2340 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 2341 /* NB: we know all frames are unicast */ 2342 params.ibp_try0 = ni->ni_txparms->maxretry; 2343 params.ibp_power = ni->ni_txpower; 2344 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION, 2345 ¶ms); 2346} 2347 2348#define ADDSHORT(frm, v) do { \ 2349 frm[0] = (v) & 0xff; \ 2350 frm[1] = (v) >> 8; \ 2351 frm += 2; \ 2352} while (0) 2353 2354/* 2355 * Send an action management frame. The arguments are stuff 2356 * into a frame without inspection; the caller is assumed to 2357 * prepare them carefully (e.g. based on the aggregation state). 2358 */ 2359static int 2360ht_send_action_ba_addba(struct ieee80211_node *ni, 2361 int category, int action, void *arg0) 2362{ 2363 struct ieee80211vap *vap = ni->ni_vap; 2364 struct ieee80211com *ic = ni->ni_ic; 2365 uint16_t *args = arg0; 2366 struct mbuf *m; 2367 uint8_t *frm; 2368 2369 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2370 "send ADDBA %s: dialogtoken %d status %d " 2371 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 2372 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ? 2373 "request" : "response", 2374 args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID), 2375 args[3], args[4]); 2376 2377 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2378 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__, 2379 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); 2380 ieee80211_ref_node(ni); 2381 2382 m = ieee80211_getmgtframe(&frm, 2383 ic->ic_headroom + sizeof(struct ieee80211_frame), 2384 sizeof(uint16_t) /* action+category */ 2385 /* XXX may action payload */ 2386 + sizeof(struct ieee80211_action_ba_addbaresponse) 2387 ); 2388 if (m != NULL) { 2389 *frm++ = category; 2390 *frm++ = action; 2391 *frm++ = args[0]; /* dialog token */ 2392 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE) 2393 ADDSHORT(frm, args[1]); /* status code */ 2394 ADDSHORT(frm, args[2]); /* baparamset */ 2395 ADDSHORT(frm, args[3]); /* batimeout */ 2396 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) 2397 ADDSHORT(frm, args[4]); /* baseqctl */ 2398 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2399 return ht_action_output(ni, m); 2400 } else { 2401 vap->iv_stats.is_tx_nobuf++; 2402 ieee80211_free_node(ni); 2403 return ENOMEM; 2404 } 2405} 2406 2407static int 2408ht_send_action_ba_delba(struct ieee80211_node *ni, 2409 int category, int action, void *arg0) 2410{ 2411 struct ieee80211vap *vap = ni->ni_vap; 2412 struct ieee80211com *ic = ni->ni_ic; 2413 uint16_t *args = arg0; 2414 struct mbuf *m; 2415 uint16_t baparamset; 2416 uint8_t *frm; 2417 2418 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 2419 | args[1] 2420 ; 2421 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2422 "send DELBA action: tid %d, initiator %d reason %d", 2423 args[0], args[1], args[2]); 2424 2425 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2426 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__, 2427 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); 2428 ieee80211_ref_node(ni); 2429 2430 m = ieee80211_getmgtframe(&frm, 2431 ic->ic_headroom + sizeof(struct ieee80211_frame), 2432 sizeof(uint16_t) /* action+category */ 2433 /* XXX may action payload */ 2434 + sizeof(struct ieee80211_action_ba_addbaresponse) 2435 ); 2436 if (m != NULL) { 2437 *frm++ = category; 2438 *frm++ = action; 2439 ADDSHORT(frm, baparamset); 2440 ADDSHORT(frm, args[2]); /* reason code */ 2441 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2442 return ht_action_output(ni, m); 2443 } else { 2444 vap->iv_stats.is_tx_nobuf++; 2445 ieee80211_free_node(ni); 2446 return ENOMEM; 2447 } 2448} 2449 2450static int 2451ht_send_action_ht_txchwidth(struct ieee80211_node *ni, 2452 int category, int action, void *arg0) 2453{ 2454 struct ieee80211vap *vap = ni->ni_vap; 2455 struct ieee80211com *ic = ni->ni_ic; 2456 struct mbuf *m; 2457 uint8_t *frm; 2458 2459 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2460 "send HT txchwidth: width %d", 2461 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20); 2462 2463 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2464 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__, 2465 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); 2466 ieee80211_ref_node(ni); 2467 2468 m = ieee80211_getmgtframe(&frm, 2469 ic->ic_headroom + sizeof(struct ieee80211_frame), 2470 sizeof(uint16_t) /* action+category */ 2471 /* XXX may action payload */ 2472 + sizeof(struct ieee80211_action_ba_addbaresponse) 2473 ); 2474 if (m != NULL) { 2475 *frm++ = category; 2476 *frm++ = action; 2477 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 2478 IEEE80211_A_HT_TXCHWIDTH_2040 : 2479 IEEE80211_A_HT_TXCHWIDTH_20; 2480 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2481 return ht_action_output(ni, m); 2482 } else { 2483 vap->iv_stats.is_tx_nobuf++; 2484 ieee80211_free_node(ni); 2485 return ENOMEM; 2486 } 2487} 2488#undef ADDSHORT 2489 2490/* 2491 * Construct the MCS bit mask for inclusion in an HT capabilities 2492 * information element. 2493 */ 2494static void 2495ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm) 2496{ 2497 int i; 2498 uint8_t txparams; 2499 2500 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4), 2501 ("ic_rxstream %d out of range", ic->ic_rxstream)); 2502 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4), 2503 ("ic_txstream %d out of range", ic->ic_txstream)); 2504 2505 for (i = 0; i < ic->ic_rxstream * 8; i++) 2506 setbit(frm, i); 2507 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) && 2508 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32)) 2509 setbit(frm, 32); 2510 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) { 2511 if (ic->ic_rxstream >= 2) { 2512 for (i = 33; i <= 38; i++) 2513 setbit(frm, i); 2514 } 2515 if (ic->ic_rxstream >= 3) { 2516 for (i = 39; i <= 52; i++) 2517 setbit(frm, i); 2518 } 2519 if (ic->ic_txstream >= 4) { 2520 for (i = 53; i <= 76; i++) 2521 setbit(frm, i); 2522 } 2523 } 2524 2525 if (ic->ic_rxstream != ic->ic_txstream) { 2526 txparams = 0x1; /* TX MCS set defined */ 2527 txparams |= 0x2; /* TX RX MCS not equal */ 2528 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */ 2529 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) 2530 txparams |= 0x16; /* TX unequal modulation sup */ 2531 } else 2532 txparams = 0; 2533 frm[12] = txparams; 2534} 2535 2536/* 2537 * Add body of an HTCAP information element. 2538 */ 2539static uint8_t * 2540ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 2541{ 2542#define ADDSHORT(frm, v) do { \ 2543 frm[0] = (v) & 0xff; \ 2544 frm[1] = (v) >> 8; \ 2545 frm += 2; \ 2546} while (0) 2547 struct ieee80211com *ic = ni->ni_ic; 2548 struct ieee80211vap *vap = ni->ni_vap; 2549 uint16_t caps, extcaps; 2550 int rxmax, density; 2551 2552 /* HT capabilities */ 2553 caps = vap->iv_htcaps & 0xffff; 2554 /* 2555 * Note channel width depends on whether we are operating as 2556 * a sta or not. When operating as a sta we are generating 2557 * a request based on our desired configuration. Otherwise 2558 * we are operational and the channel attributes identify 2559 * how we've been setup (which might be different if a fixed 2560 * channel is specified). 2561 */ 2562 if (vap->iv_opmode == IEEE80211_M_STA) { 2563 /* override 20/40 use based on config */ 2564 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40) 2565 caps |= IEEE80211_HTCAP_CHWIDTH40; 2566 else 2567 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2568 /* use advertised setting (XXX locally constraint) */ 2569 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 2570 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 2571 2572 /* 2573 * NB: Hardware might support HT40 on some but not all 2574 * channels. We can't determine this earlier because only 2575 * after association the channel is upgraded to HT based 2576 * on the negotiated capabilities. 2577 */ 2578 if (ni->ni_chan != IEEE80211_CHAN_ANYC && 2579 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL && 2580 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL) 2581 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2582 } else { 2583 /* override 20/40 use based on current channel */ 2584 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2585 caps |= IEEE80211_HTCAP_CHWIDTH40; 2586 else 2587 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2588 rxmax = vap->iv_ampdu_rxmax; 2589 density = vap->iv_ampdu_density; 2590 } 2591 /* adjust short GI based on channel and config */ 2592 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0) 2593 caps &= ~IEEE80211_HTCAP_SHORTGI20; 2594 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 || 2595 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 2596 caps &= ~IEEE80211_HTCAP_SHORTGI40; 2597 ADDSHORT(frm, caps); 2598 2599 /* HT parameters */ 2600 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 2601 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 2602 ; 2603 frm++; 2604 2605 /* pre-zero remainder of ie */ 2606 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 2607 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 2608 2609 /* supported MCS set */ 2610 /* 2611 * XXX: For sta mode the rate set should be restricted based 2612 * on the AP's capabilities, but ni_htrates isn't setup when 2613 * we're called to form an AssocReq frame so for now we're 2614 * restricted to the device capabilities. 2615 */ 2616 ieee80211_set_mcsset(ni->ni_ic, frm); 2617 2618 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) - 2619 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 2620 2621 /* HT extended capabilities */ 2622 extcaps = vap->iv_htextcaps & 0xffff; 2623 2624 ADDSHORT(frm, extcaps); 2625 2626 frm += sizeof(struct ieee80211_ie_htcap) - 2627 __offsetof(struct ieee80211_ie_htcap, hc_txbf); 2628 2629 return frm; 2630#undef ADDSHORT 2631} 2632 2633/* 2634 * Add 802.11n HT capabilities information element 2635 */ 2636uint8_t * 2637ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2638{ 2639 frm[0] = IEEE80211_ELEMID_HTCAP; 2640 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2641 return ieee80211_add_htcap_body(frm + 2, ni); 2642} 2643 2644/* 2645 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2646 * used for compatibility w/ pre-draft implementations. 2647 */ 2648uint8_t * 2649ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2650{ 2651 frm[0] = IEEE80211_ELEMID_VENDOR; 2652 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2653 frm[2] = (BCM_OUI >> 0) & 0xff; 2654 frm[3] = (BCM_OUI >> 8) & 0xff; 2655 frm[4] = (BCM_OUI >> 16) & 0xff; 2656 frm[5] = BCM_OUI_HTCAP; 2657 return ieee80211_add_htcap_body(frm + 6, ni); 2658} 2659 2660/* 2661 * Construct the MCS bit mask of basic rates 2662 * for inclusion in an HT information element. 2663 */ 2664static void 2665ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2666{ 2667 int i; 2668 2669 for (i = 0; i < rs->rs_nrates; i++) { 2670 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2671 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2672 r < IEEE80211_HTRATE_MAXSIZE) { 2673 /* NB: this assumes a particular implementation */ 2674 setbit(frm, r); 2675 } 2676 } 2677} 2678 2679/* 2680 * Update the HTINFO ie for a beacon frame. 2681 */ 2682void 2683ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2684 struct ieee80211_beacon_offsets *bo) 2685{ 2686#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2687 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2688 struct ieee80211com *ic = vap->iv_ic; 2689 struct ieee80211_ie_htinfo *ht = 2690 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2691 2692 /* XXX only update on channel change */ 2693 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2694 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 2695 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM; 2696 else 2697 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2698 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2699 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2700 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2701 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2702 else 2703 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2704 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2705 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2706 2707 /* protection mode */ 2708 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2709 2710 /* XXX propagate to vendor ie's */ 2711#undef PROTMODE 2712} 2713 2714/* 2715 * Add body of an HTINFO information element. 2716 * 2717 * NB: We don't use struct ieee80211_ie_htinfo because we can 2718 * be called to fillin both a standard ie and a compat ie that 2719 * has a vendor OUI at the front. 2720 */ 2721static uint8_t * 2722ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2723{ 2724 struct ieee80211vap *vap = ni->ni_vap; 2725 struct ieee80211com *ic = ni->ni_ic; 2726 2727 /* pre-zero remainder of ie */ 2728 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2729 2730 /* primary/control channel center */ 2731 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2732 2733 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 2734 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM; 2735 else 2736 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2737 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2738 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2739 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2740 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2741 else 2742 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2743 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2744 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2745 2746 frm[1] = ic->ic_curhtprotmode; 2747 2748 frm += 5; 2749 2750 /* basic MCS set */ 2751 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2752 frm += sizeof(struct ieee80211_ie_htinfo) - 2753 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2754 return frm; 2755} 2756 2757/* 2758 * Add 802.11n HT information information element. 2759 */ 2760uint8_t * 2761ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2762{ 2763 frm[0] = IEEE80211_ELEMID_HTINFO; 2764 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2765 return ieee80211_add_htinfo_body(frm + 2, ni); 2766} 2767 2768/* 2769 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2770 * used for compatibility w/ pre-draft implementations. 2771 */ 2772uint8_t * 2773ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2774{ 2775 frm[0] = IEEE80211_ELEMID_VENDOR; 2776 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2777 frm[2] = (BCM_OUI >> 0) & 0xff; 2778 frm[3] = (BCM_OUI >> 8) & 0xff; 2779 frm[4] = (BCM_OUI >> 16) & 0xff; 2780 frm[5] = BCM_OUI_HTINFO; 2781 return ieee80211_add_htinfo_body(frm + 6, ni); 2782} 2783