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 57 const 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 static const struct ieee80211_htrateset ieee80211_rateset_11n = 138 { 16, { 139 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 140 10, 11, 12, 13, 14, 15 } 141 }; 142 143 #ifdef IEEE80211_AMPDU_AGE 144 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 145 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW, 146 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I", 147 "AMPDU max reorder age (ms)"); 148 #endif 149 150 static int ieee80211_recv_bar_ena = 1; 151 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena, 152 0, "BAR frame processing (ena/dis)"); 153 154 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */ 155 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW, 156 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I", 157 "ADDBA request timeout (ms)"); 158 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */ 159 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW, 160 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I", 161 "ADDBA request backoff (ms)"); 162 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */ 163 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW, 164 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff"); 165 166 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */ 167 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */ 168 169 static ieee80211_recv_action_func ht_recv_action_ba_addba_request; 170 static ieee80211_recv_action_func ht_recv_action_ba_addba_response; 171 static ieee80211_recv_action_func ht_recv_action_ba_delba; 172 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave; 173 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth; 174 175 static ieee80211_send_action_func ht_send_action_ba_addba; 176 static ieee80211_send_action_func ht_send_action_ba_delba; 177 static ieee80211_send_action_func ht_send_action_ht_txchwidth; 178 179 static void 180 ieee80211_ht_init(void) 181 { 182 /* 183 * Setup HT parameters that depends on the clock frequency. 184 */ 185 #ifdef IEEE80211_AMPDU_AGE 186 ieee80211_ampdu_age = msecs_to_ticks(500); 187 #endif 188 ieee80211_addba_timeout = msecs_to_ticks(250); 189 ieee80211_addba_backoff = msecs_to_ticks(10*1000); 190 ieee80211_bar_timeout = msecs_to_ticks(250); 191 /* 192 * Register action frame handlers. 193 */ 194 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 195 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request); 196 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 197 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response); 198 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA, 199 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba); 200 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 201 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave); 202 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT, 203 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth); 204 205 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 206 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba); 207 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 208 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba); 209 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA, 210 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba); 211 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT, 212 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth); 213 } 214 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL); 215 216 static int ieee80211_ampdu_enable(struct ieee80211_node *ni, 217 struct ieee80211_tx_ampdu *tap); 218 static int ieee80211_addba_request(struct ieee80211_node *ni, 219 struct ieee80211_tx_ampdu *tap, 220 int dialogtoken, int baparamset, int batimeout); 221 static int ieee80211_addba_response(struct ieee80211_node *ni, 222 struct ieee80211_tx_ampdu *tap, 223 int code, int baparamset, int batimeout); 224 static void ieee80211_addba_stop(struct ieee80211_node *ni, 225 struct ieee80211_tx_ampdu *tap); 226 static void ieee80211_bar_response(struct ieee80211_node *ni, 227 struct ieee80211_tx_ampdu *tap, int status); 228 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap); 229 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap); 230 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *, 231 int baparamset, int batimeout, int baseqctl); 232 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *); 233 234 void 235 ieee80211_ht_attach(struct ieee80211com *ic) 236 { 237 /* setup default aggregation policy */ 238 ic->ic_recv_action = ieee80211_recv_action; 239 ic->ic_send_action = ieee80211_send_action; 240 ic->ic_ampdu_enable = ieee80211_ampdu_enable; 241 ic->ic_addba_request = ieee80211_addba_request; 242 ic->ic_addba_response = ieee80211_addba_response; 243 ic->ic_addba_stop = ieee80211_addba_stop; 244 ic->ic_bar_response = ieee80211_bar_response; 245 ic->ic_ampdu_rx_start = ampdu_rx_start; 246 ic->ic_ampdu_rx_stop = ampdu_rx_stop; 247 248 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS; 249 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 250 } 251 252 void 253 ieee80211_ht_detach(struct ieee80211com *ic) 254 { 255 } 256 257 void 258 ieee80211_ht_vattach(struct ieee80211vap *vap) 259 { 260 261 /* driver can override defaults */ 262 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 263 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 264 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax; 265 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU; 266 /* tx aggregation traffic thresholds */ 267 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128; 268 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64; 269 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32; 270 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32; 271 272 if (vap->iv_htcaps & IEEE80211_HTC_HT) { 273 /* 274 * Device is HT capable; enable all HT-related 275 * facilities by default. 276 * XXX these choices may be too aggressive. 277 */ 278 vap->iv_flags_ht |= IEEE80211_FHT_HT 279 | IEEE80211_FHT_HTCOMPAT 280 ; 281 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20) 282 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20; 283 /* XXX infer from channel list? */ 284 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 285 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40; 286 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40) 287 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40; 288 } 289 /* enable RIFS if capable */ 290 if (vap->iv_htcaps & IEEE80211_HTC_RIFS) 291 vap->iv_flags_ht |= IEEE80211_FHT_RIFS; 292 293 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 294 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX; 295 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU) 296 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX; 297 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX; 298 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU) 299 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX; 300 } 301 /* NB: disable default legacy WDS, too many issues right now */ 302 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) 303 vap->iv_flags_ht &= ~IEEE80211_FHT_HT; 304 } 305 306 void 307 ieee80211_ht_vdetach(struct ieee80211vap *vap) 308 { 309 } 310 311 static int 312 ht_getrate(struct ieee80211com *ic, int index, int mode, int ratetype) 313 { 314 int mword, rate; 315 316 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode); 317 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 318 return (0); 319 switch (ratetype) { 320 case 0: 321 rate = ieee80211_htrates[index].ht20_rate_800ns; 322 break; 323 case 1: 324 rate = ieee80211_htrates[index].ht20_rate_400ns; 325 break; 326 case 2: 327 rate = ieee80211_htrates[index].ht40_rate_800ns; 328 break; 329 default: 330 rate = ieee80211_htrates[index].ht40_rate_400ns; 331 break; 332 } 333 return (rate); 334 } 335 336 static struct printranges { 337 int minmcs; 338 int maxmcs; 339 int txstream; 340 int ratetype; 341 int htcapflags; 342 } ranges[] = { 343 { 0, 7, 1, 0, 0 }, 344 { 8, 15, 2, 0, 0 }, 345 { 16, 23, 3, 0, 0 }, 346 { 24, 31, 4, 0, 0 }, 347 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 }, 348 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL }, 349 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL }, 350 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL }, 351 { 0, 0, 0, 0, 0 }, 352 }; 353 354 static void 355 ht_rateprint(struct ieee80211com *ic, int mode, int ratetype) 356 { 357 struct ifnet *ifp = ic->ic_ifp; 358 int minrate, maxrate; 359 struct printranges *range; 360 361 for (range = ranges; range->txstream != 0; range++) { 362 if (ic->ic_txstream < range->txstream) 363 continue; 364 if (range->htcapflags && 365 (ic->ic_htcaps & range->htcapflags) == 0) 366 continue; 367 if (ratetype < range->ratetype) 368 continue; 369 minrate = ht_getrate(ic, range->minmcs, mode, ratetype); 370 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype); 371 if (range->maxmcs) { 372 if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n", 373 range->minmcs, range->maxmcs, 374 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""), 375 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : "")); 376 } else { 377 if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs, 378 minrate/2, ((minrate & 0x1) != 0 ? ".5" : "")); 379 } 380 } 381 } 382 383 static void 384 ht_announce(struct ieee80211com *ic, int mode) 385 { 386 struct ifnet *ifp = ic->ic_ifp; 387 const char *modestr = ieee80211_phymode_name[mode]; 388 389 if_printf(ifp, "%s MCS 20Mhz\n", modestr); 390 ht_rateprint(ic, mode, 0); 391 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) { 392 if_printf(ifp, "%s MCS 20Mhz SGI\n", modestr); 393 ht_rateprint(ic, mode, 1); 394 } 395 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 396 if_printf(ifp, "%s MCS 40Mhz:\n", modestr); 397 ht_rateprint(ic, mode, 2); 398 } 399 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) && 400 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) { 401 if_printf(ifp, "%s MCS 40Mhz SGI:\n", modestr); 402 ht_rateprint(ic, mode, 3); 403 } 404 } 405 406 void 407 ieee80211_ht_announce(struct ieee80211com *ic) 408 { 409 struct ifnet *ifp = ic->ic_ifp; 410 411 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) || 412 isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 413 if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream); 414 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 415 ht_announce(ic, IEEE80211_MODE_11NA); 416 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 417 ht_announce(ic, IEEE80211_MODE_11NG); 418 } 419 420 const struct ieee80211_htrateset * 421 ieee80211_get_suphtrates(struct ieee80211com *ic, 422 const struct ieee80211_channel *c) 423 { 424 return &ieee80211_rateset_11n; 425 } 426 427 /* 428 * Receive processing. 429 */ 430 431 /* 432 * Decap the encapsulated A-MSDU frames and dispatch all but 433 * the last for delivery. The last frame is returned for 434 * delivery via the normal path. 435 */ 436 struct mbuf * 437 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 438 { 439 struct ieee80211vap *vap = ni->ni_vap; 440 int framelen; 441 struct mbuf *n; 442 443 /* discard 802.3 header inserted by ieee80211_decap */ 444 m_adj(m, sizeof(struct ether_header)); 445 446 vap->iv_stats.is_amsdu_decap++; 447 448 for (;;) { 449 /* 450 * Decap the first frame, bust it apart from the 451 * remainder and deliver. We leave the last frame 452 * delivery to the caller (for consistency with other 453 * code paths, could also do it here). 454 */ 455 m = ieee80211_decap1(m, &framelen); 456 if (m == NULL) { 457 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 458 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 459 vap->iv_stats.is_amsdu_tooshort++; 460 return NULL; 461 } 462 if (m->m_pkthdr.len == framelen) 463 break; 464 n = m_split(m, framelen, M_NOWAIT); 465 if (n == NULL) { 466 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 467 ni->ni_macaddr, "a-msdu", 468 "%s", "unable to split encapsulated frames"); 469 vap->iv_stats.is_amsdu_split++; 470 m_freem(m); /* NB: must reclaim */ 471 return NULL; 472 } 473 vap->iv_deliver_data(vap, ni, m); 474 475 /* 476 * Remove frame contents; each intermediate frame 477 * is required to be aligned to a 4-byte boundary. 478 */ 479 m = n; 480 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 481 } 482 return m; /* last delivered by caller */ 483 } 484 485 /* 486 * Purge all frames in the A-MPDU re-order queue. 487 */ 488 static void 489 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 490 { 491 struct mbuf *m; 492 int i; 493 494 for (i = 0; i < rap->rxa_wnd; i++) { 495 m = rap->rxa_m[i]; 496 if (m != NULL) { 497 rap->rxa_m[i] = NULL; 498 rap->rxa_qbytes -= m->m_pkthdr.len; 499 m_freem(m); 500 if (--rap->rxa_qframes == 0) 501 break; 502 } 503 } 504 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 505 ("lost %u data, %u frames on ampdu rx q", 506 rap->rxa_qbytes, rap->rxa_qframes)); 507 } 508 509 /* 510 * Start A-MPDU rx/re-order processing for the specified TID. 511 */ 512 static int 513 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap, 514 int baparamset, int batimeout, int baseqctl) 515 { 516 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 517 518 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) { 519 /* 520 * AMPDU previously setup and not terminated with a DELBA, 521 * flush the reorder q's in case anything remains. 522 */ 523 ampdu_rx_purge(rap); 524 } 525 memset(rap, 0, sizeof(*rap)); 526 rap->rxa_wnd = (bufsiz == 0) ? 527 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 528 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START); 529 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND; 530 531 return 0; 532 } 533 534 /* 535 * Stop A-MPDU rx processing for the specified TID. 536 */ 537 static void 538 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 539 { 540 541 ampdu_rx_purge(rap); 542 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND); 543 } 544 545 /* 546 * Dispatch a frame from the A-MPDU reorder queue. The 547 * frame is fed back into ieee80211_input marked with an 548 * M_AMPDU_MPDU flag so it doesn't come back to us (it also 549 * permits ieee80211_input to optimize re-processing). 550 */ 551 static __inline void 552 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 553 { 554 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */ 555 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */ 556 (void) ieee80211_input(ni, m, 0, 0); 557 } 558 559 /* 560 * Dispatch as many frames as possible from the re-order queue. 561 * Frames will always be "at the front"; we process all frames 562 * up to the first empty slot in the window. On completion we 563 * cleanup state if there are still pending frames in the current 564 * BA window. We assume the frame at slot 0 is already handled 565 * by the caller; we always start at slot 1. 566 */ 567 static void 568 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 569 { 570 struct ieee80211vap *vap = ni->ni_vap; 571 struct mbuf *m; 572 int i; 573 574 /* flush run of frames */ 575 for (i = 1; i < rap->rxa_wnd; i++) { 576 m = rap->rxa_m[i]; 577 if (m == NULL) 578 break; 579 rap->rxa_m[i] = NULL; 580 rap->rxa_qbytes -= m->m_pkthdr.len; 581 rap->rxa_qframes--; 582 583 ampdu_dispatch(ni, m); 584 } 585 /* 586 * If frames remain, copy the mbuf pointers down so 587 * they correspond to the offsets in the new window. 588 */ 589 if (rap->rxa_qframes != 0) { 590 int n = rap->rxa_qframes, j; 591 for (j = i+1; j < rap->rxa_wnd; j++) { 592 if (rap->rxa_m[j] != NULL) { 593 rap->rxa_m[j-i] = rap->rxa_m[j]; 594 rap->rxa_m[j] = NULL; 595 if (--n == 0) 596 break; 597 } 598 } 599 KASSERT(n == 0, ("lost %d frames", n)); 600 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 601 } 602 /* 603 * Adjust the start of the BA window to 604 * reflect the frames just dispatched. 605 */ 606 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 607 vap->iv_stats.is_ampdu_rx_oor += i; 608 } 609 610 #ifdef IEEE80211_AMPDU_AGE 611 /* 612 * Dispatch all frames in the A-MPDU re-order queue. 613 */ 614 static void 615 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 616 { 617 struct ieee80211vap *vap = ni->ni_vap; 618 struct mbuf *m; 619 int i; 620 621 for (i = 0; i < rap->rxa_wnd; i++) { 622 m = rap->rxa_m[i]; 623 if (m == NULL) 624 continue; 625 rap->rxa_m[i] = NULL; 626 rap->rxa_qbytes -= m->m_pkthdr.len; 627 rap->rxa_qframes--; 628 vap->iv_stats.is_ampdu_rx_oor++; 629 630 ampdu_dispatch(ni, m); 631 if (rap->rxa_qframes == 0) 632 break; 633 } 634 } 635 #endif /* IEEE80211_AMPDU_AGE */ 636 637 /* 638 * Dispatch all frames in the A-MPDU re-order queue 639 * preceding the specified sequence number. This logic 640 * handles window moves due to a received MSDU or BAR. 641 */ 642 static void 643 ampdu_rx_flush_upto(struct ieee80211_node *ni, 644 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 645 { 646 struct ieee80211vap *vap = ni->ni_vap; 647 struct mbuf *m; 648 ieee80211_seq seqno; 649 int i; 650 651 /* 652 * Flush any complete MSDU's with a sequence number lower 653 * than winstart. Gaps may exist. Note that we may actually 654 * dispatch frames past winstart if a run continues; this is 655 * an optimization that avoids having to do a separate pass 656 * to dispatch frames after moving the BA window start. 657 */ 658 seqno = rap->rxa_start; 659 for (i = 0; i < rap->rxa_wnd; i++) { 660 m = rap->rxa_m[i]; 661 if (m != NULL) { 662 rap->rxa_m[i] = NULL; 663 rap->rxa_qbytes -= m->m_pkthdr.len; 664 rap->rxa_qframes--; 665 vap->iv_stats.is_ampdu_rx_oor++; 666 667 ampdu_dispatch(ni, m); 668 } else { 669 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 670 break; 671 } 672 seqno = IEEE80211_SEQ_INC(seqno); 673 } 674 /* 675 * If frames remain, copy the mbuf pointers down so 676 * they correspond to the offsets in the new window. 677 */ 678 if (rap->rxa_qframes != 0) { 679 int n = rap->rxa_qframes, j; 680 681 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */ 682 KASSERT(rap->rxa_m[0] == NULL, 683 ("%s: BA window slot 0 occupied", __func__)); 684 for (j = i+1; j < rap->rxa_wnd; j++) { 685 if (rap->rxa_m[j] != NULL) { 686 rap->rxa_m[j-i] = rap->rxa_m[j]; 687 rap->rxa_m[j] = NULL; 688 if (--n == 0) 689 break; 690 } 691 } 692 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 693 "BA win <%d:%d> winstart %d", 694 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 695 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 696 winstart)); 697 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes; 698 } 699 /* 700 * Move the start of the BA window; we use the 701 * sequence number of the last MSDU that was 702 * passed up the stack+1 or winstart if stopped on 703 * a gap in the reorder buffer. 704 */ 705 rap->rxa_start = seqno; 706 } 707 708 /* 709 * Process a received QoS data frame for an HT station. Handle 710 * A-MPDU reordering: if this frame is received out of order 711 * and falls within the BA window hold onto it. Otherwise if 712 * this frame completes a run, flush any pending frames. We 713 * return 1 if the frame is consumed. A 0 is returned if 714 * the frame should be processed normally by the caller. 715 */ 716 int 717 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 718 { 719 #define IEEE80211_FC0_QOSDATA \ 720 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 721 #define PROCESS 0 /* caller should process frame */ 722 #define CONSUMED 1 /* frame consumed, caller does nothing */ 723 struct ieee80211vap *vap = ni->ni_vap; 724 struct ieee80211_qosframe *wh; 725 struct ieee80211_rx_ampdu *rap; 726 ieee80211_seq rxseq; 727 uint8_t tid; 728 int off; 729 730 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU, 731 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags)); 732 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 733 734 /* NB: m_len known to be sufficient */ 735 wh = mtod(m, struct ieee80211_qosframe *); 736 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) { 737 /* 738 * Not QoS data, shouldn't get here but just 739 * return it to the caller for processing. 740 */ 741 return PROCESS; 742 } 743 if (IEEE80211_IS_DSTODS(wh)) 744 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 745 else 746 tid = wh->i_qos[0]; 747 tid &= IEEE80211_QOS_TID; 748 rap = &ni->ni_rx_ampdu[tid]; 749 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 750 /* 751 * No ADDBA request yet, don't touch. 752 */ 753 return PROCESS; 754 } 755 rxseq = le16toh(*(uint16_t *)wh->i_seq); 756 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) { 757 /* 758 * Fragments are not allowed; toss. 759 */ 760 IEEE80211_DISCARD_MAC(vap, 761 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 762 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid, 763 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 764 vap->iv_stats.is_ampdu_rx_drop++; 765 IEEE80211_NODE_STAT(ni, rx_drop); 766 m_freem(m); 767 return CONSUMED; 768 } 769 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT; 770 rap->rxa_nframes++; 771 again: 772 if (rxseq == rap->rxa_start) { 773 /* 774 * First frame in window. 775 */ 776 if (rap->rxa_qframes != 0) { 777 /* 778 * Dispatch as many packets as we can. 779 */ 780 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 781 ampdu_dispatch(ni, m); 782 ampdu_rx_dispatch(rap, ni); 783 return CONSUMED; 784 } else { 785 /* 786 * In order; advance window and notify 787 * caller to dispatch directly. 788 */ 789 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 790 return PROCESS; 791 } 792 } 793 /* 794 * Frame is out of order; store if in the BA window. 795 */ 796 /* calculate offset in BA window */ 797 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 798 if (off < rap->rxa_wnd) { 799 /* 800 * Common case (hopefully): in the BA window. 801 * Sec 9.10.7.6.2 a) (p.137) 802 */ 803 #ifdef IEEE80211_AMPDU_AGE 804 /* 805 * Check for frames sitting too long in the reorder queue. 806 * This should only ever happen if frames are not delivered 807 * without the sender otherwise notifying us (e.g. with a 808 * BAR to move the window). Typically this happens because 809 * of vendor bugs that cause the sequence number to jump. 810 * When this happens we get a gap in the reorder queue that 811 * leaves frame sitting on the queue until they get pushed 812 * out due to window moves. When the vendor does not send 813 * BAR this move only happens due to explicit packet sends 814 * 815 * NB: we only track the time of the oldest frame in the 816 * reorder q; this means that if we flush we might push 817 * frames that still "new"; if this happens then subsequent 818 * frames will result in BA window moves which cost something 819 * but is still better than a big throughput dip. 820 */ 821 if (rap->rxa_qframes != 0) { 822 /* XXX honor batimeout? */ 823 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 824 /* 825 * Too long since we received the first 826 * frame; flush the reorder buffer. 827 */ 828 if (rap->rxa_qframes != 0) { 829 vap->iv_stats.is_ampdu_rx_age += 830 rap->rxa_qframes; 831 ampdu_rx_flush(ni, rap); 832 } 833 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 834 return PROCESS; 835 } 836 } else { 837 /* 838 * First frame, start aging timer. 839 */ 840 rap->rxa_age = ticks; 841 } 842 #endif /* IEEE80211_AMPDU_AGE */ 843 /* save packet */ 844 if (rap->rxa_m[off] == NULL) { 845 rap->rxa_m[off] = m; 846 rap->rxa_qframes++; 847 rap->rxa_qbytes += m->m_pkthdr.len; 848 vap->iv_stats.is_ampdu_rx_reorder++; 849 } else { 850 IEEE80211_DISCARD_MAC(vap, 851 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 852 ni->ni_macaddr, "a-mpdu duplicate", 853 "seqno %u tid %u BA win <%u:%u>", 854 rxseq, tid, rap->rxa_start, 855 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 856 vap->iv_stats.is_rx_dup++; 857 IEEE80211_NODE_STAT(ni, rx_dup); 858 m_freem(m); 859 } 860 return CONSUMED; 861 } 862 if (off < IEEE80211_SEQ_BA_RANGE) { 863 /* 864 * Outside the BA window, but within range; 865 * flush the reorder q and move the window. 866 * Sec 9.10.7.6.2 b) (p.138) 867 */ 868 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 869 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 870 rap->rxa_start, 871 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 872 rap->rxa_qframes, rxseq, tid); 873 vap->iv_stats.is_ampdu_rx_move++; 874 875 /* 876 * The spec says to flush frames up to but not including: 877 * WinStart_B = rxseq - rap->rxa_wnd + 1 878 * Then insert the frame or notify the caller to process 879 * it immediately. We can safely do this by just starting 880 * over again because we know the frame will now be within 881 * the BA window. 882 */ 883 /* NB: rxa_wnd known to be >0 */ 884 ampdu_rx_flush_upto(ni, rap, 885 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 886 goto again; 887 } else { 888 /* 889 * Outside the BA window and out of range; toss. 890 * Sec 9.10.7.6.2 c) (p.138) 891 */ 892 IEEE80211_DISCARD_MAC(vap, 893 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 894 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 895 rap->rxa_start, 896 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 897 rap->rxa_qframes, rxseq, tid, 898 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 899 vap->iv_stats.is_ampdu_rx_drop++; 900 IEEE80211_NODE_STAT(ni, rx_drop); 901 m_freem(m); 902 return CONSUMED; 903 } 904 #undef CONSUMED 905 #undef PROCESS 906 #undef IEEE80211_FC0_QOSDATA 907 } 908 909 /* 910 * Process a BAR ctl frame. Dispatch all frames up to 911 * the sequence number of the frame. If this frame is 912 * out of range it's discarded. 913 */ 914 void 915 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 916 { 917 struct ieee80211vap *vap = ni->ni_vap; 918 struct ieee80211_frame_bar *wh; 919 struct ieee80211_rx_ampdu *rap; 920 ieee80211_seq rxseq; 921 int tid, off; 922 923 if (!ieee80211_recv_bar_ena) { 924 #if 0 925 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N, 926 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 927 #endif 928 vap->iv_stats.is_ampdu_bar_bad++; 929 return; 930 } 931 wh = mtod(m0, struct ieee80211_frame_bar *); 932 /* XXX check basic BAR */ 933 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 934 rap = &ni->ni_rx_ampdu[tid]; 935 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 936 /* 937 * No ADDBA request yet, don't touch. 938 */ 939 IEEE80211_DISCARD_MAC(vap, 940 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 941 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 942 vap->iv_stats.is_ampdu_bar_bad++; 943 return; 944 } 945 vap->iv_stats.is_ampdu_bar_rx++; 946 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 947 if (rxseq == rap->rxa_start) 948 return; 949 /* calculate offset in BA window */ 950 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 951 if (off < IEEE80211_SEQ_BA_RANGE) { 952 /* 953 * Flush the reorder q up to rxseq and move the window. 954 * Sec 9.10.7.6.3 a) (p.138) 955 */ 956 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 957 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 958 rap->rxa_start, 959 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 960 rap->rxa_qframes, rxseq, tid); 961 vap->iv_stats.is_ampdu_bar_move++; 962 963 ampdu_rx_flush_upto(ni, rap, rxseq); 964 if (off >= rap->rxa_wnd) { 965 /* 966 * BAR specifies a window start to the right of BA 967 * window; we must move it explicitly since 968 * ampdu_rx_flush_upto will not. 969 */ 970 rap->rxa_start = rxseq; 971 } 972 } else { 973 /* 974 * Out of range; toss. 975 * Sec 9.10.7.6.3 b) (p.138) 976 */ 977 IEEE80211_DISCARD_MAC(vap, 978 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 979 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 980 rap->rxa_start, 981 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 982 rap->rxa_qframes, rxseq, tid, 983 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 984 vap->iv_stats.is_ampdu_bar_oow++; 985 IEEE80211_NODE_STAT(ni, rx_drop); 986 } 987 } 988 989 /* 990 * Setup HT-specific state in a node. Called only 991 * when HT use is negotiated so we don't do extra 992 * work for temporary and/or legacy sta's. 993 */ 994 void 995 ieee80211_ht_node_init(struct ieee80211_node *ni) 996 { 997 struct ieee80211_tx_ampdu *tap; 998 int ac; 999 1000 if (ni->ni_flags & IEEE80211_NODE_HT) { 1001 /* 1002 * Clean AMPDU state on re-associate. This handles the case 1003 * where a station leaves w/o notifying us and then returns 1004 * before node is reaped for inactivity. 1005 */ 1006 ieee80211_ht_node_cleanup(ni); 1007 } 1008 for (ac = 0; ac < WME_NUM_AC; ac++) { 1009 tap = &ni->ni_tx_ampdu[ac]; 1010 tap->txa_ac = ac; 1011 tap->txa_ni = ni; 1012 /* NB: further initialization deferred */ 1013 } 1014 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 1015 } 1016 1017 /* 1018 * Cleanup HT-specific state in a node. Called only 1019 * when HT use has been marked. 1020 */ 1021 void 1022 ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 1023 { 1024 struct ieee80211com *ic = ni->ni_ic; 1025 int i; 1026 1027 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 1028 1029 /* XXX optimize this */ 1030 for (i = 0; i < WME_NUM_AC; i++) { 1031 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 1032 if (tap->txa_flags & IEEE80211_AGGR_SETUP) 1033 ampdu_tx_stop(tap); 1034 } 1035 for (i = 0; i < WME_NUM_TID; i++) 1036 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]); 1037 1038 ni->ni_htcap = 0; 1039 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL; 1040 } 1041 1042 /* 1043 * Age out HT resources for a station. 1044 */ 1045 void 1046 ieee80211_ht_node_age(struct ieee80211_node *ni) 1047 { 1048 #ifdef IEEE80211_AMPDU_AGE 1049 struct ieee80211vap *vap = ni->ni_vap; 1050 uint8_t tid; 1051 #endif 1052 1053 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 1054 1055 #ifdef IEEE80211_AMPDU_AGE 1056 for (tid = 0; tid < WME_NUM_TID; tid++) { 1057 struct ieee80211_rx_ampdu *rap; 1058 1059 rap = &ni->ni_rx_ampdu[tid]; 1060 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) 1061 continue; 1062 if (rap->rxa_qframes == 0) 1063 continue; 1064 /* 1065 * Check for frames sitting too long in the reorder queue. 1066 * See above for more details on what's happening here. 1067 */ 1068 /* XXX honor batimeout? */ 1069 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 1070 /* 1071 * Too long since we received the first 1072 * frame; flush the reorder buffer. 1073 */ 1074 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes; 1075 ampdu_rx_flush(ni, rap); 1076 } 1077 } 1078 #endif /* IEEE80211_AMPDU_AGE */ 1079 } 1080 1081 static struct ieee80211_channel * 1082 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 1083 { 1084 return ieee80211_find_channel(ic, c->ic_freq, 1085 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 1086 } 1087 1088 /* 1089 * Adjust a channel to be HT/non-HT according to the vap's configuration. 1090 */ 1091 struct ieee80211_channel * 1092 ieee80211_ht_adjust_channel(struct ieee80211com *ic, 1093 struct ieee80211_channel *chan, int flags) 1094 { 1095 struct ieee80211_channel *c; 1096 1097 if (flags & IEEE80211_FHT_HT) { 1098 /* promote to HT if possible */ 1099 if (flags & IEEE80211_FHT_USEHT40) { 1100 if (!IEEE80211_IS_CHAN_HT40(chan)) { 1101 /* NB: arbitrarily pick ht40+ over ht40- */ 1102 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 1103 if (c == NULL) 1104 c = findhtchan(ic, chan, 1105 IEEE80211_CHAN_HT40D); 1106 if (c == NULL) 1107 c = findhtchan(ic, chan, 1108 IEEE80211_CHAN_HT20); 1109 if (c != NULL) 1110 chan = c; 1111 } 1112 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 1113 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 1114 if (c != NULL) 1115 chan = c; 1116 } 1117 } else if (IEEE80211_IS_CHAN_HT(chan)) { 1118 /* demote to legacy, HT use is disabled */ 1119 c = ieee80211_find_channel(ic, chan->ic_freq, 1120 chan->ic_flags &~ IEEE80211_CHAN_HT); 1121 if (c != NULL) 1122 chan = c; 1123 } 1124 return chan; 1125 } 1126 1127 /* 1128 * Setup HT-specific state for a legacy WDS peer. 1129 */ 1130 void 1131 ieee80211_ht_wds_init(struct ieee80211_node *ni) 1132 { 1133 struct ieee80211vap *vap = ni->ni_vap; 1134 struct ieee80211_tx_ampdu *tap; 1135 int ac; 1136 1137 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested")); 1138 1139 /* XXX check scan cache in case peer has an ap and we have info */ 1140 /* 1141 * If setup with a legacy channel; locate an HT channel. 1142 * Otherwise if the inherited channel (from a companion 1143 * AP) is suitable use it so we use the same location 1144 * for the extension channel). 1145 */ 1146 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic, 1147 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan)); 1148 1149 ni->ni_htcap = 0; 1150 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) 1151 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 1152 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 1153 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 1154 ni->ni_chw = 40; 1155 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 1156 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 1157 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 1158 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 1159 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) 1160 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 1161 } else { 1162 ni->ni_chw = 20; 1163 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 1164 } 1165 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 1166 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 1167 ni->ni_flags |= IEEE80211_NODE_RIFS; 1168 /* XXX does it make sense to enable SMPS? */ 1169 1170 ni->ni_htopmode = 0; /* XXX need protection state */ 1171 ni->ni_htstbc = 0; /* XXX need info */ 1172 1173 for (ac = 0; ac < WME_NUM_AC; ac++) { 1174 tap = &ni->ni_tx_ampdu[ac]; 1175 tap->txa_ac = ac; 1176 } 1177 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */ 1178 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 1179 } 1180 1181 /* 1182 * Notify hostap vaps of a change in the HTINFO ie. 1183 */ 1184 static void 1185 htinfo_notify(struct ieee80211com *ic) 1186 { 1187 struct ieee80211vap *vap; 1188 int first = 1; 1189 1190 IEEE80211_LOCK_ASSERT(ic); 1191 1192 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 1193 if (vap->iv_opmode != IEEE80211_M_HOSTAP) 1194 continue; 1195 if (vap->iv_state != IEEE80211_S_RUN || 1196 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan)) 1197 continue; 1198 if (first) { 1199 IEEE80211_NOTE(vap, 1200 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 1201 vap->iv_bss, 1202 "HT bss occupancy change: %d sta, %d ht, " 1203 "%d ht40%s, HT protmode now 0x%x" 1204 , ic->ic_sta_assoc 1205 , ic->ic_ht_sta_assoc 1206 , ic->ic_ht40_sta_assoc 1207 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ? 1208 ", non-HT sta present" : "" 1209 , ic->ic_curhtprotmode); 1210 first = 0; 1211 } 1212 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO); 1213 } 1214 } 1215 1216 /* 1217 * Calculate HT protection mode from current 1218 * state and handle updates. 1219 */ 1220 static void 1221 htinfo_update(struct ieee80211com *ic) 1222 { 1223 uint8_t protmode; 1224 1225 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 1226 protmode = IEEE80211_HTINFO_OPMODE_MIXED 1227 | IEEE80211_HTINFO_NONHT_PRESENT; 1228 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) { 1229 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 1230 | IEEE80211_HTINFO_NONHT_PRESENT; 1231 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC && 1232 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 1233 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 1234 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 1235 } else { 1236 protmode = IEEE80211_HTINFO_OPMODE_PURE; 1237 } 1238 if (protmode != ic->ic_curhtprotmode) { 1239 ic->ic_curhtprotmode = protmode; 1240 htinfo_notify(ic); 1241 } 1242 } 1243 1244 /* 1245 * Handle an HT station joining a BSS. 1246 */ 1247 void 1248 ieee80211_ht_node_join(struct ieee80211_node *ni) 1249 { 1250 struct ieee80211com *ic = ni->ni_ic; 1251 1252 IEEE80211_LOCK_ASSERT(ic); 1253 1254 if (ni->ni_flags & IEEE80211_NODE_HT) { 1255 ic->ic_ht_sta_assoc++; 1256 if (ni->ni_chw == 40) 1257 ic->ic_ht40_sta_assoc++; 1258 } 1259 htinfo_update(ic); 1260 } 1261 1262 /* 1263 * Handle an HT station leaving a BSS. 1264 */ 1265 void 1266 ieee80211_ht_node_leave(struct ieee80211_node *ni) 1267 { 1268 struct ieee80211com *ic = ni->ni_ic; 1269 1270 IEEE80211_LOCK_ASSERT(ic); 1271 1272 if (ni->ni_flags & IEEE80211_NODE_HT) { 1273 ic->ic_ht_sta_assoc--; 1274 if (ni->ni_chw == 40) 1275 ic->ic_ht40_sta_assoc--; 1276 } 1277 htinfo_update(ic); 1278 } 1279 1280 /* 1281 * Public version of htinfo_update; used for processing 1282 * beacon frames from overlapping bss. 1283 * 1284 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED 1285 * (on receipt of a beacon that advertises MIXED) or 1286 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon 1287 * from an overlapping legacy bss). We treat MIXED with 1288 * a higher precedence than PROTOPT (i.e. we will not change 1289 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This 1290 * corresponds to how we handle things in htinfo_update. 1291 */ 1292 void 1293 ieee80211_htprot_update(struct ieee80211com *ic, int protmode) 1294 { 1295 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE) 1296 IEEE80211_LOCK(ic); 1297 1298 /* track non-HT station presence */ 1299 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT, 1300 ("protmode 0x%x", protmode)); 1301 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR; 1302 ic->ic_lastnonht = ticks; 1303 1304 if (protmode != ic->ic_curhtprotmode && 1305 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED || 1306 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) { 1307 /* push beacon update */ 1308 ic->ic_curhtprotmode = protmode; 1309 htinfo_notify(ic); 1310 } 1311 IEEE80211_UNLOCK(ic); 1312 #undef OPMODE 1313 } 1314 1315 /* 1316 * Time out presence of an overlapping bss with non-HT 1317 * stations. When operating in hostap mode we listen for 1318 * beacons from other stations and if we identify a non-HT 1319 * station is present we update the opmode field of the 1320 * HTINFO ie. To identify when all non-HT stations are 1321 * gone we time out this condition. 1322 */ 1323 void 1324 ieee80211_ht_timeout(struct ieee80211com *ic) 1325 { 1326 IEEE80211_LOCK_ASSERT(ic); 1327 1328 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) && 1329 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 1330 #if 0 1331 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 1332 "%s", "time out non-HT STA present on channel"); 1333 #endif 1334 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 1335 htinfo_update(ic); 1336 } 1337 } 1338 1339 /* unalligned little endian access */ 1340 #define LE_READ_2(p) \ 1341 ((uint16_t) \ 1342 ((((const uint8_t *)(p))[0] ) | \ 1343 (((const uint8_t *)(p))[1] << 8))) 1344 1345 /* 1346 * Process an 802.11n HT capabilities ie. 1347 */ 1348 void 1349 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1350 { 1351 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1352 /* 1353 * Station used Vendor OUI ie to associate; 1354 * mark the node so when we respond we'll use 1355 * the Vendor OUI's and not the standard ie's. 1356 */ 1357 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1358 ie += 4; 1359 } else 1360 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1361 1362 ni->ni_htcap = LE_READ_2(ie + 1363 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1364 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1365 } 1366 1367 static void 1368 htinfo_parse(struct ieee80211_node *ni, 1369 const struct ieee80211_ie_htinfo *htinfo) 1370 { 1371 uint16_t w; 1372 1373 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1374 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1375 w = LE_READ_2(&htinfo->hi_byte2); 1376 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1377 w = LE_READ_2(&htinfo->hi_byte45); 1378 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1379 } 1380 1381 /* 1382 * Parse an 802.11n HT info ie and save useful information 1383 * to the node state. Note this does not effect any state 1384 * changes such as for channel width change. 1385 */ 1386 void 1387 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1388 { 1389 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1390 ie += 4; 1391 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie); 1392 } 1393 1394 /* 1395 * Handle 11n channel switch. Use the received HT ie's to 1396 * identify the right channel to use. If we cannot locate it 1397 * in the channel table then fallback to legacy operation. 1398 * Note that we use this information to identify the node's 1399 * channel only; the caller is responsible for insuring any 1400 * required channel change is done (e.g. in sta mode when 1401 * parsing the contents of a beacon frame). 1402 */ 1403 static void 1404 htinfo_update_chw(struct ieee80211_node *ni, int htflags) 1405 { 1406 struct ieee80211com *ic = ni->ni_ic; 1407 struct ieee80211_channel *c; 1408 int chanflags; 1409 1410 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1411 if (chanflags != ni->ni_chan->ic_flags) { 1412 /* XXX not right for ht40- */ 1413 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1414 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) { 1415 /* 1416 * No HT40 channel entry in our table; fall back 1417 * to HT20 operation. This should not happen. 1418 */ 1419 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1420 #if 0 1421 IEEE80211_NOTE(ni->ni_vap, 1422 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1423 "no HT40 channel (freq %u), falling back to HT20", 1424 ni->ni_chan->ic_freq); 1425 #endif 1426 /* XXX stat */ 1427 } 1428 if (c != NULL && c != ni->ni_chan) { 1429 IEEE80211_NOTE(ni->ni_vap, 1430 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1431 "switch station to HT%d channel %u/0x%x", 1432 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1433 c->ic_freq, c->ic_flags); 1434 ni->ni_chan = c; 1435 } 1436 /* NB: caller responsible for forcing any channel change */ 1437 } 1438 /* update node's tx channel width */ 1439 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1440 } 1441 1442 /* 1443 * Update 11n MIMO PS state according to received htcap. 1444 */ 1445 static __inline int 1446 htcap_update_mimo_ps(struct ieee80211_node *ni) 1447 { 1448 uint16_t oflags = ni->ni_flags; 1449 1450 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) { 1451 case IEEE80211_HTCAP_SMPS_DYNAMIC: 1452 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1453 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1454 break; 1455 case IEEE80211_HTCAP_SMPS_ENA: 1456 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1457 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1458 break; 1459 case IEEE80211_HTCAP_SMPS_OFF: 1460 default: /* disable on rx of reserved value */ 1461 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1462 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1463 break; 1464 } 1465 return (oflags ^ ni->ni_flags); 1466 } 1467 1468 /* 1469 * Update short GI state according to received htcap 1470 * and local settings. 1471 */ 1472 static __inline void 1473 htcap_update_shortgi(struct ieee80211_node *ni) 1474 { 1475 struct ieee80211vap *vap = ni->ni_vap; 1476 1477 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40); 1478 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) && 1479 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)) 1480 ni->ni_flags |= IEEE80211_NODE_SGI20; 1481 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) && 1482 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)) 1483 ni->ni_flags |= IEEE80211_NODE_SGI40; 1484 } 1485 1486 /* 1487 * Parse and update HT-related state extracted from 1488 * the HT cap and info ie's. 1489 */ 1490 void 1491 ieee80211_ht_updateparams(struct ieee80211_node *ni, 1492 const uint8_t *htcapie, const uint8_t *htinfoie) 1493 { 1494 struct ieee80211vap *vap = ni->ni_vap; 1495 const struct ieee80211_ie_htinfo *htinfo; 1496 int htflags; 1497 1498 ieee80211_parse_htcap(ni, htcapie); 1499 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1500 htcap_update_mimo_ps(ni); 1501 htcap_update_shortgi(ni); 1502 1503 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR) 1504 htinfoie += 4; 1505 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie; 1506 htinfo_parse(ni, htinfo); 1507 1508 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ? 1509 IEEE80211_CHAN_HT20 : 0; 1510 /* NB: honor operating mode constraint */ 1511 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1512 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) { 1513 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1514 htflags = IEEE80211_CHAN_HT40U; 1515 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1516 htflags = IEEE80211_CHAN_HT40D; 1517 } 1518 htinfo_update_chw(ni, htflags); 1519 1520 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) && 1521 (vap->iv_flags_ht & IEEE80211_FHT_RIFS)) 1522 ni->ni_flags |= IEEE80211_NODE_RIFS; 1523 else 1524 ni->ni_flags &= ~IEEE80211_NODE_RIFS; 1525 } 1526 1527 /* 1528 * Parse and update HT-related state extracted from the HT cap ie 1529 * for a station joining an HT BSS. 1530 */ 1531 void 1532 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie) 1533 { 1534 struct ieee80211vap *vap = ni->ni_vap; 1535 int htflags; 1536 1537 ieee80211_parse_htcap(ni, htcapie); 1538 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS) 1539 htcap_update_mimo_ps(ni); 1540 htcap_update_shortgi(ni); 1541 1542 /* NB: honor operating mode constraint */ 1543 /* XXX 40 MHZ intolerant */ 1544 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ? 1545 IEEE80211_CHAN_HT20 : 0; 1546 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1547 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) { 1548 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan)) 1549 htflags = IEEE80211_CHAN_HT40U; 1550 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan)) 1551 htflags = IEEE80211_CHAN_HT40D; 1552 } 1553 htinfo_update_chw(ni, htflags); 1554 } 1555 1556 /* 1557 * Install received HT rate set by parsing the HT cap ie. 1558 */ 1559 int 1560 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1561 { 1562 struct ieee80211vap *vap = ni->ni_vap; 1563 const struct ieee80211_ie_htcap *htcap; 1564 struct ieee80211_htrateset *rs; 1565 int i; 1566 1567 rs = &ni->ni_htrates; 1568 memset(rs, 0, sizeof(*rs)); 1569 if (ie != NULL) { 1570 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1571 ie += 4; 1572 htcap = (const struct ieee80211_ie_htcap *) ie; 1573 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1574 if (isclr(htcap->hc_mcsset, i)) 1575 continue; 1576 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1577 IEEE80211_NOTE(vap, 1578 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1579 "WARNING, HT rate set too large; only " 1580 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1581 vap->iv_stats.is_rx_rstoobig++; 1582 break; 1583 } 1584 rs->rs_rates[rs->rs_nrates++] = i; 1585 } 1586 } 1587 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1588 } 1589 1590 /* 1591 * Mark rates in a node's HT rate set as basic according 1592 * to the information in the supplied HT info ie. 1593 */ 1594 void 1595 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1596 { 1597 const struct ieee80211_ie_htinfo *htinfo; 1598 struct ieee80211_htrateset *rs; 1599 int i, j; 1600 1601 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1602 ie += 4; 1603 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1604 rs = &ni->ni_htrates; 1605 if (rs->rs_nrates == 0) { 1606 IEEE80211_NOTE(ni->ni_vap, 1607 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1608 "%s", "WARNING, empty HT rate set"); 1609 return; 1610 } 1611 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1612 if (isclr(htinfo->hi_basicmcsset, i)) 1613 continue; 1614 for (j = 0; j < rs->rs_nrates; j++) 1615 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1616 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1617 } 1618 } 1619 1620 static void 1621 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap) 1622 { 1623 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1624 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1625 } 1626 1627 static void 1628 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap) 1629 { 1630 struct ieee80211_node *ni = tap->txa_ni; 1631 struct ieee80211com *ic = ni->ni_ic; 1632 1633 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP, 1634 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac)); 1635 1636 /* 1637 * Stop BA stream if setup so driver has a chance 1638 * to reclaim any resources it might have allocated. 1639 */ 1640 ic->ic_addba_stop(ni, tap); 1641 /* 1642 * Stop any pending BAR transmit. 1643 */ 1644 bar_stop_timer(tap); 1645 1646 tap->txa_lastsample = 0; 1647 tap->txa_avgpps = 0; 1648 /* NB: clearing NAK means we may re-send ADDBA */ 1649 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 1650 } 1651 1652 static void 1653 addba_timeout(void *arg) 1654 { 1655 struct ieee80211_tx_ampdu *tap = arg; 1656 1657 /* XXX ? */ 1658 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1659 tap->txa_attempts++; 1660 } 1661 1662 static void 1663 addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1664 { 1665 /* XXX use CALLOUT_PENDING instead? */ 1666 callout_reset(&tap->txa_timer, ieee80211_addba_timeout, 1667 addba_timeout, tap); 1668 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1669 tap->txa_nextrequest = ticks + ieee80211_addba_timeout; 1670 } 1671 1672 static void 1673 addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1674 { 1675 /* XXX use CALLOUT_PENDING instead? */ 1676 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1677 callout_stop(&tap->txa_timer); 1678 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1679 } 1680 } 1681 1682 /* 1683 * Default method for requesting A-MPDU tx aggregation. 1684 * We setup the specified state block and start a timer 1685 * to wait for an ADDBA response frame. 1686 */ 1687 static int 1688 ieee80211_addba_request(struct ieee80211_node *ni, 1689 struct ieee80211_tx_ampdu *tap, 1690 int dialogtoken, int baparamset, int batimeout) 1691 { 1692 int bufsiz; 1693 1694 /* XXX locking */ 1695 tap->txa_token = dialogtoken; 1696 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1697 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1698 tap->txa_wnd = (bufsiz == 0) ? 1699 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1700 addba_start_timeout(tap); 1701 return 1; 1702 } 1703 1704 /* 1705 * Default method for processing an A-MPDU tx aggregation 1706 * response. We shutdown any pending timer and update the 1707 * state block according to the reply. 1708 */ 1709 static int 1710 ieee80211_addba_response(struct ieee80211_node *ni, 1711 struct ieee80211_tx_ampdu *tap, 1712 int status, int baparamset, int batimeout) 1713 { 1714 int bufsiz, tid; 1715 1716 /* XXX locking */ 1717 addba_stop_timeout(tap); 1718 if (status == IEEE80211_STATUS_SUCCESS) { 1719 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1720 /* XXX override our request? */ 1721 tap->txa_wnd = (bufsiz == 0) ? 1722 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1723 /* XXX AC/TID */ 1724 tid = MS(baparamset, IEEE80211_BAPS_TID); 1725 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1726 tap->txa_attempts = 0; 1727 } else { 1728 /* mark tid so we don't try again */ 1729 tap->txa_flags |= IEEE80211_AGGR_NAK; 1730 } 1731 return 1; 1732 } 1733 1734 /* 1735 * Default method for stopping A-MPDU tx aggregation. 1736 * Any timer is cleared and we drain any pending frames. 1737 */ 1738 static void 1739 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1740 { 1741 /* XXX locking */ 1742 addba_stop_timeout(tap); 1743 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1744 /* XXX clear aggregation queue */ 1745 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1746 } 1747 tap->txa_attempts = 0; 1748 } 1749 1750 /* 1751 * Process a received action frame using the default aggregation 1752 * policy. We intercept ADDBA-related frames and use them to 1753 * update our aggregation state. All other frames are passed up 1754 * for processing by ieee80211_recv_action. 1755 */ 1756 static int 1757 ht_recv_action_ba_addba_request(struct ieee80211_node *ni, 1758 const struct ieee80211_frame *wh, 1759 const uint8_t *frm, const uint8_t *efrm) 1760 { 1761 struct ieee80211com *ic = ni->ni_ic; 1762 struct ieee80211vap *vap = ni->ni_vap; 1763 struct ieee80211_rx_ampdu *rap; 1764 uint8_t dialogtoken; 1765 uint16_t baparamset, batimeout, baseqctl; 1766 uint16_t args[5]; 1767 int tid; 1768 1769 dialogtoken = frm[2]; 1770 baparamset = LE_READ_2(frm+3); 1771 batimeout = LE_READ_2(frm+5); 1772 baseqctl = LE_READ_2(frm+7); 1773 1774 tid = MS(baparamset, IEEE80211_BAPS_TID); 1775 1776 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1777 "recv ADDBA request: dialogtoken %u baparamset 0x%x " 1778 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d", 1779 dialogtoken, baparamset, 1780 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ), 1781 batimeout, 1782 MS(baseqctl, IEEE80211_BASEQ_START), 1783 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1784 1785 rap = &ni->ni_rx_ampdu[tid]; 1786 1787 /* Send ADDBA response */ 1788 args[0] = dialogtoken; 1789 /* 1790 * NB: We ack only if the sta associated with HT and 1791 * the ap is configured to do AMPDU rx (the latter 1792 * violates the 11n spec and is mostly for testing). 1793 */ 1794 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1795 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) { 1796 /* XXX handle ampdu_rx_start failure */ 1797 ic->ic_ampdu_rx_start(ni, rap, 1798 baparamset, batimeout, baseqctl); 1799 1800 args[1] = IEEE80211_STATUS_SUCCESS; 1801 } else { 1802 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1803 ni, "reject ADDBA request: %s", 1804 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1805 "administratively disabled" : 1806 "not negotiated for station"); 1807 vap->iv_stats.is_addba_reject++; 1808 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1809 } 1810 /* XXX honor rap flags? */ 1811 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1812 | SM(tid, IEEE80211_BAPS_TID) 1813 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1814 ; 1815 args[3] = 0; 1816 args[4] = 0; 1817 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1818 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1819 return 0; 1820 } 1821 1822 static int 1823 ht_recv_action_ba_addba_response(struct ieee80211_node *ni, 1824 const struct ieee80211_frame *wh, 1825 const uint8_t *frm, const uint8_t *efrm) 1826 { 1827 struct ieee80211com *ic = ni->ni_ic; 1828 struct ieee80211vap *vap = ni->ni_vap; 1829 struct ieee80211_tx_ampdu *tap; 1830 uint8_t dialogtoken, policy; 1831 uint16_t baparamset, batimeout, code; 1832 int tid, ac, bufsiz; 1833 1834 dialogtoken = frm[2]; 1835 code = LE_READ_2(frm+3); 1836 baparamset = LE_READ_2(frm+5); 1837 tid = MS(baparamset, IEEE80211_BAPS_TID); 1838 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1839 policy = MS(baparamset, IEEE80211_BAPS_POLICY); 1840 batimeout = LE_READ_2(frm+7); 1841 1842 ac = TID_TO_WME_AC(tid); 1843 tap = &ni->ni_tx_ampdu[ac]; 1844 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1845 IEEE80211_DISCARD_MAC(vap, 1846 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1847 ni->ni_macaddr, "ADDBA response", 1848 "no pending ADDBA, tid %d dialogtoken %u " 1849 "code %d", tid, dialogtoken, code); 1850 vap->iv_stats.is_addba_norequest++; 1851 return 0; 1852 } 1853 if (dialogtoken != tap->txa_token) { 1854 IEEE80211_DISCARD_MAC(vap, 1855 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1856 ni->ni_macaddr, "ADDBA response", 1857 "dialogtoken mismatch: waiting for %d, " 1858 "received %d, tid %d code %d", 1859 tap->txa_token, dialogtoken, tid, code); 1860 vap->iv_stats.is_addba_badtoken++; 1861 return 0; 1862 } 1863 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */ 1864 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) { 1865 IEEE80211_DISCARD_MAC(vap, 1866 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1867 ni->ni_macaddr, "ADDBA response", 1868 "policy mismatch: expecting %s, " 1869 "received %s, tid %d code %d", 1870 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE, 1871 policy, tid, code); 1872 vap->iv_stats.is_addba_badpolicy++; 1873 return 0; 1874 } 1875 #if 0 1876 /* XXX we take MIN in ieee80211_addba_response */ 1877 if (bufsiz > IEEE80211_AGGR_BAWMAX) { 1878 IEEE80211_DISCARD_MAC(vap, 1879 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1880 ni->ni_macaddr, "ADDBA response", 1881 "BA window too large: max %d, " 1882 "received %d, tid %d code %d", 1883 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code); 1884 vap->iv_stats.is_addba_badbawinsize++; 1885 return 0; 1886 } 1887 #endif 1888 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1889 "recv ADDBA response: dialogtoken %u code %d " 1890 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1891 dialogtoken, code, baparamset, tid, bufsiz, 1892 batimeout); 1893 ic->ic_addba_response(ni, tap, code, baparamset, batimeout); 1894 return 0; 1895 } 1896 1897 static int 1898 ht_recv_action_ba_delba(struct ieee80211_node *ni, 1899 const struct ieee80211_frame *wh, 1900 const uint8_t *frm, const uint8_t *efrm) 1901 { 1902 struct ieee80211com *ic = ni->ni_ic; 1903 struct ieee80211_rx_ampdu *rap; 1904 struct ieee80211_tx_ampdu *tap; 1905 uint16_t baparamset, code; 1906 int tid, ac; 1907 1908 baparamset = LE_READ_2(frm+2); 1909 code = LE_READ_2(frm+4); 1910 1911 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1912 1913 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1914 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1915 "code %d", baparamset, tid, 1916 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1917 1918 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1919 ac = TID_TO_WME_AC(tid); 1920 tap = &ni->ni_tx_ampdu[ac]; 1921 ic->ic_addba_stop(ni, tap); 1922 } else { 1923 rap = &ni->ni_rx_ampdu[tid]; 1924 ic->ic_ampdu_rx_stop(ni, rap); 1925 } 1926 return 0; 1927 } 1928 1929 static int 1930 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni, 1931 const struct ieee80211_frame *wh, 1932 const uint8_t *frm, const uint8_t *efrm) 1933 { 1934 int chw; 1935 1936 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20; 1937 1938 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1939 "%s: HT txchwidth, width %d%s", 1940 __func__, chw, ni->ni_chw != chw ? "*" : ""); 1941 if (chw != ni->ni_chw) { 1942 ni->ni_chw = chw; 1943 /* XXX notify on change */ 1944 } 1945 return 0; 1946 } 1947 1948 static int 1949 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni, 1950 const struct ieee80211_frame *wh, 1951 const uint8_t *frm, const uint8_t *efrm) 1952 { 1953 const struct ieee80211_action_ht_mimopowersave *mps = 1954 (const struct ieee80211_action_ht_mimopowersave *) frm; 1955 1956 /* XXX check iv_htcaps */ 1957 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA) 1958 ni->ni_flags |= IEEE80211_NODE_MIMO_PS; 1959 else 1960 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS; 1961 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE) 1962 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS; 1963 else 1964 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS; 1965 /* XXX notify on change */ 1966 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1967 "%s: HT MIMO PS (%s%s)", __func__, 1968 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off", 1969 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : "" 1970 ); 1971 return 0; 1972 } 1973 1974 /* 1975 * Transmit processing. 1976 */ 1977 1978 /* 1979 * Check if A-MPDU should be requested/enabled for a stream. 1980 * We require a traffic rate above a per-AC threshold and we 1981 * also handle backoff from previous failed attempts. 1982 * 1983 * Drivers may override this method to bring in information 1984 * such as link state conditions in making the decision. 1985 */ 1986 static int 1987 ieee80211_ampdu_enable(struct ieee80211_node *ni, 1988 struct ieee80211_tx_ampdu *tap) 1989 { 1990 struct ieee80211vap *vap = ni->ni_vap; 1991 1992 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac]) 1993 return 0; 1994 /* XXX check rssi? */ 1995 if (tap->txa_attempts >= ieee80211_addba_maxtries && 1996 ticks < tap->txa_nextrequest) { 1997 /* 1998 * Don't retry too often; txa_nextrequest is set 1999 * to the minimum interval we'll retry after 2000 * ieee80211_addba_maxtries failed attempts are made. 2001 */ 2002 return 0; 2003 } 2004 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni, 2005 "enable AMPDU on %s, avgpps %d pkts %d", 2006 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts); 2007 return 1; 2008 } 2009 2010 /* 2011 * Request A-MPDU tx aggregation. Setup local state and 2012 * issue an ADDBA request. BA use will only happen after 2013 * the other end replies with ADDBA response. 2014 */ 2015 int 2016 ieee80211_ampdu_request(struct ieee80211_node *ni, 2017 struct ieee80211_tx_ampdu *tap) 2018 { 2019 struct ieee80211com *ic = ni->ni_ic; 2020 uint16_t args[5]; 2021 int tid, dialogtoken; 2022 static int tokens = 0; /* XXX */ 2023 2024 /* XXX locking */ 2025 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 2026 /* do deferred setup of state */ 2027 ampdu_tx_setup(tap); 2028 } 2029 /* XXX hack for not doing proper locking */ 2030 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 2031 2032 dialogtoken = (tokens+1) % 63; /* XXX */ 2033 tid = WME_AC_TO_TID(tap->txa_ac); 2034 tap->txa_start = ni->ni_txseqs[tid]; 2035 2036 args[0] = dialogtoken; 2037 args[1] = 0; /* NB: status code not used */ 2038 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 2039 | SM(tid, IEEE80211_BAPS_TID) 2040 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 2041 ; 2042 args[3] = 0; /* batimeout */ 2043 /* NB: do first so there's no race against reply */ 2044 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) { 2045 /* unable to setup state, don't make request */ 2046 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2047 ni, "%s: could not setup BA stream for AC %d", 2048 __func__, tap->txa_ac); 2049 /* defer next try so we don't slam the driver with requests */ 2050 tap->txa_attempts = ieee80211_addba_maxtries; 2051 /* NB: check in case driver wants to override */ 2052 if (tap->txa_nextrequest <= ticks) 2053 tap->txa_nextrequest = ticks + ieee80211_addba_backoff; 2054 return 0; 2055 } 2056 tokens = dialogtoken; /* allocate token */ 2057 /* NB: after calling ic_addba_request so driver can set txa_start */ 2058 args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START) 2059 | SM(0, IEEE80211_BASEQ_FRAG) 2060 ; 2061 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 2062 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 2063 } 2064 2065 /* 2066 * Terminate an AMPDU tx stream. State is reclaimed 2067 * and the peer notified with a DelBA Action frame. 2068 */ 2069 void 2070 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap, 2071 int reason) 2072 { 2073 struct ieee80211com *ic = ni->ni_ic; 2074 struct ieee80211vap *vap = ni->ni_vap; 2075 uint16_t args[4]; 2076 2077 /* XXX locking */ 2078 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2079 if (IEEE80211_AMPDU_RUNNING(tap)) { 2080 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2081 ni, "%s: stop BA stream for AC %d (reason %d)", 2082 __func__, tap->txa_ac, reason); 2083 vap->iv_stats.is_ampdu_stop++; 2084 2085 ic->ic_addba_stop(ni, tap); 2086 args[0] = WME_AC_TO_TID(tap->txa_ac); 2087 args[1] = IEEE80211_DELBAPS_INIT; 2088 args[2] = reason; /* XXX reason code */ 2089 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 2090 IEEE80211_ACTION_BA_DELBA, args); 2091 } else { 2092 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 2093 ni, "%s: BA stream for AC %d not running (reason %d)", 2094 __func__, tap->txa_ac, reason); 2095 vap->iv_stats.is_ampdu_stop_failed++; 2096 } 2097 } 2098 2099 static void 2100 bar_timeout(void *arg) 2101 { 2102 struct ieee80211_tx_ampdu *tap = arg; 2103 struct ieee80211_node *ni = tap->txa_ni; 2104 2105 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0, 2106 ("bar/addba collision, flags 0x%x", tap->txa_flags)); 2107 2108 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2109 ni, "%s: tid %u flags 0x%x attempts %d", __func__, 2110 tap->txa_ac, tap->txa_flags, tap->txa_attempts); 2111 2112 /* guard against race with bar_tx_complete */ 2113 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 2114 return; 2115 /* XXX ? */ 2116 if (tap->txa_attempts >= ieee80211_bar_maxtries) 2117 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT); 2118 else 2119 ieee80211_send_bar(ni, tap, tap->txa_seqpending); 2120 } 2121 2122 static void 2123 bar_start_timer(struct ieee80211_tx_ampdu *tap) 2124 { 2125 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap); 2126 } 2127 2128 static void 2129 bar_stop_timer(struct ieee80211_tx_ampdu *tap) 2130 { 2131 callout_stop(&tap->txa_timer); 2132 } 2133 2134 static void 2135 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status) 2136 { 2137 struct ieee80211_tx_ampdu *tap = arg; 2138 2139 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2140 ni, "%s: tid %u flags 0x%x pending %d status %d", 2141 __func__, tap->txa_ac, tap->txa_flags, 2142 callout_pending(&tap->txa_timer), status); 2143 2144 /* XXX locking */ 2145 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) && 2146 callout_pending(&tap->txa_timer)) { 2147 struct ieee80211com *ic = ni->ni_ic; 2148 2149 if (status) /* ACK'd */ 2150 bar_stop_timer(tap); 2151 ic->ic_bar_response(ni, tap, status); 2152 /* NB: just let timer expire so we pace requests */ 2153 } 2154 } 2155 2156 static void 2157 ieee80211_bar_response(struct ieee80211_node *ni, 2158 struct ieee80211_tx_ampdu *tap, int status) 2159 { 2160 2161 if (status != 0) { /* got ACK */ 2162 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, 2163 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u", 2164 tap->txa_start, 2165 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1), 2166 tap->txa_qframes, tap->txa_seqpending, 2167 WME_AC_TO_TID(tap->txa_ac)); 2168 2169 /* NB: timer already stopped in bar_tx_complete */ 2170 tap->txa_start = tap->txa_seqpending; 2171 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2172 } 2173 } 2174 2175 /* 2176 * Transmit a BAR frame to the specified node. The 2177 * BAR contents are drawn from the supplied aggregation 2178 * state associated with the node. 2179 * 2180 * NB: we only handle immediate ACK w/ compressed bitmap. 2181 */ 2182 int 2183 ieee80211_send_bar(struct ieee80211_node *ni, 2184 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq) 2185 { 2186 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2187 struct ieee80211vap *vap = ni->ni_vap; 2188 struct ieee80211com *ic = ni->ni_ic; 2189 struct ieee80211_frame_bar *bar; 2190 struct mbuf *m; 2191 uint16_t barctl, barseqctl; 2192 uint8_t *frm; 2193 int tid, ret; 2194 2195 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) { 2196 /* no ADDBA response, should not happen */ 2197 /* XXX stat+msg */ 2198 return EINVAL; 2199 } 2200 /* XXX locking */ 2201 bar_stop_timer(tap); 2202 2203 ieee80211_ref_node(ni); 2204 2205 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar)); 2206 if (m == NULL) 2207 senderr(ENOMEM, is_tx_nobuf); 2208 2209 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) { 2210 m_freem(m); 2211 senderr(ENOMEM, is_tx_nobuf); /* XXX */ 2212 /* NOTREACHED */ 2213 } 2214 2215 bar = mtod(m, struct ieee80211_frame_bar *); 2216 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2217 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 2218 bar->i_fc[1] = 0; 2219 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr); 2220 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr); 2221 2222 tid = WME_AC_TO_TID(tap->txa_ac); 2223 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 2224 0 : IEEE80211_BAR_NOACK) 2225 | IEEE80211_BAR_COMP 2226 | SM(tid, IEEE80211_BAR_TID) 2227 ; 2228 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START); 2229 /* NB: known to have proper alignment */ 2230 bar->i_ctl = htole16(barctl); 2231 bar->i_seq = htole16(barseqctl); 2232 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar); 2233 2234 M_WME_SETAC(m, WME_AC_VO); 2235 2236 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 2237 2238 /* XXX locking */ 2239 /* init/bump attempts counter */ 2240 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0) 2241 tap->txa_attempts = 1; 2242 else 2243 tap->txa_attempts++; 2244 tap->txa_seqpending = seq; 2245 tap->txa_flags |= IEEE80211_AGGR_BARPEND; 2246 2247 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N, 2248 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)", 2249 tid, barctl, seq, tap->txa_attempts); 2250 2251 ret = ic->ic_raw_xmit(ni, m, NULL); 2252 if (ret != 0) { 2253 /* xmit failed, clear state flag */ 2254 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND; 2255 goto bad; 2256 } 2257 /* XXX hack against tx complete happening before timer is started */ 2258 if (tap->txa_flags & IEEE80211_AGGR_BARPEND) 2259 bar_start_timer(tap); 2260 return 0; 2261 bad: 2262 ieee80211_free_node(ni); 2263 return ret; 2264 #undef senderr 2265 } 2266 2267 static int 2268 ht_action_output(struct ieee80211_node *ni, struct mbuf *m) 2269 { 2270 struct ieee80211_bpf_params params; 2271 2272 memset(¶ms, 0, sizeof(params)); 2273 params.ibp_pri = WME_AC_VO; 2274 params.ibp_rate0 = ni->ni_txparms->mgmtrate; 2275 /* NB: we know all frames are unicast */ 2276 params.ibp_try0 = ni->ni_txparms->maxretry; 2277 params.ibp_power = ni->ni_txpower; 2278 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION, 2279 ¶ms); 2280 } 2281 2282 #define ADDSHORT(frm, v) do { \ 2283 frm[0] = (v) & 0xff; \ 2284 frm[1] = (v) >> 8; \ 2285 frm += 2; \ 2286 } while (0) 2287 2288 /* 2289 * Send an action management frame. The arguments are stuff 2290 * into a frame without inspection; the caller is assumed to 2291 * prepare them carefully (e.g. based on the aggregation state). 2292 */ 2293 static int 2294 ht_send_action_ba_addba(struct ieee80211_node *ni, 2295 int category, int action, void *arg0) 2296 { 2297 struct ieee80211vap *vap = ni->ni_vap; 2298 struct ieee80211com *ic = ni->ni_ic; 2299 uint16_t *args = arg0; 2300 struct mbuf *m; 2301 uint8_t *frm; 2302 2303 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2304 "send ADDBA %s: dialogtoken %d status %d " 2305 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 2306 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ? 2307 "request" : "response", 2308 args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID), 2309 args[3], args[4]); 2310 2311 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2312 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__, 2313 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); 2314 ieee80211_ref_node(ni); 2315 2316 m = ieee80211_getmgtframe(&frm, 2317 ic->ic_headroom + sizeof(struct ieee80211_frame), 2318 sizeof(uint16_t) /* action+category */ 2319 /* XXX may action payload */ 2320 + sizeof(struct ieee80211_action_ba_addbaresponse) 2321 ); 2322 if (m != NULL) { 2323 *frm++ = category; 2324 *frm++ = action; 2325 *frm++ = args[0]; /* dialog token */ 2326 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE) 2327 ADDSHORT(frm, args[1]); /* status code */ 2328 ADDSHORT(frm, args[2]); /* baparamset */ 2329 ADDSHORT(frm, args[3]); /* batimeout */ 2330 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) 2331 ADDSHORT(frm, args[4]); /* baseqctl */ 2332 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2333 return ht_action_output(ni, m); 2334 } else { 2335 vap->iv_stats.is_tx_nobuf++; 2336 ieee80211_free_node(ni); 2337 return ENOMEM; 2338 } 2339 } 2340 2341 static int 2342 ht_send_action_ba_delba(struct ieee80211_node *ni, 2343 int category, int action, void *arg0) 2344 { 2345 struct ieee80211vap *vap = ni->ni_vap; 2346 struct ieee80211com *ic = ni->ni_ic; 2347 uint16_t *args = arg0; 2348 struct mbuf *m; 2349 uint16_t baparamset; 2350 uint8_t *frm; 2351 2352 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 2353 | args[1] 2354 ; 2355 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2356 "send DELBA action: tid %d, initiator %d reason %d", 2357 args[0], args[1], args[2]); 2358 2359 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2360 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__, 2361 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); 2362 ieee80211_ref_node(ni); 2363 2364 m = ieee80211_getmgtframe(&frm, 2365 ic->ic_headroom + sizeof(struct ieee80211_frame), 2366 sizeof(uint16_t) /* action+category */ 2367 /* XXX may action payload */ 2368 + sizeof(struct ieee80211_action_ba_addbaresponse) 2369 ); 2370 if (m != NULL) { 2371 *frm++ = category; 2372 *frm++ = action; 2373 ADDSHORT(frm, baparamset); 2374 ADDSHORT(frm, args[2]); /* reason code */ 2375 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2376 return ht_action_output(ni, m); 2377 } else { 2378 vap->iv_stats.is_tx_nobuf++; 2379 ieee80211_free_node(ni); 2380 return ENOMEM; 2381 } 2382 } 2383 2384 static int 2385 ht_send_action_ht_txchwidth(struct ieee80211_node *ni, 2386 int category, int action, void *arg0) 2387 { 2388 struct ieee80211vap *vap = ni->ni_vap; 2389 struct ieee80211com *ic = ni->ni_ic; 2390 struct mbuf *m; 2391 uint8_t *frm; 2392 2393 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 2394 "send HT txchwidth: width %d", 2395 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20); 2396 2397 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2398 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__, 2399 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); 2400 ieee80211_ref_node(ni); 2401 2402 m = ieee80211_getmgtframe(&frm, 2403 ic->ic_headroom + sizeof(struct ieee80211_frame), 2404 sizeof(uint16_t) /* action+category */ 2405 /* XXX may action payload */ 2406 + sizeof(struct ieee80211_action_ba_addbaresponse) 2407 ); 2408 if (m != NULL) { 2409 *frm++ = category; 2410 *frm++ = action; 2411 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 2412 IEEE80211_A_HT_TXCHWIDTH_2040 : 2413 IEEE80211_A_HT_TXCHWIDTH_20; 2414 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2415 return ht_action_output(ni, m); 2416 } else { 2417 vap->iv_stats.is_tx_nobuf++; 2418 ieee80211_free_node(ni); 2419 return ENOMEM; 2420 } 2421 } 2422 #undef ADDSHORT 2423 2424 /* 2425 * Construct the MCS bit mask for inclusion 2426 * in an HT information element. 2427 */ 2428 static void 2429 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2430 { 2431 int i; 2432 2433 for (i = 0; i < rs->rs_nrates; i++) { 2434 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2435 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 2436 /* NB: this assumes a particular implementation */ 2437 setbit(frm, r); 2438 } 2439 } 2440 } 2441 2442 /* 2443 * Add body of an HTCAP information element. 2444 */ 2445 static uint8_t * 2446 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 2447 { 2448 #define ADDSHORT(frm, v) do { \ 2449 frm[0] = (v) & 0xff; \ 2450 frm[1] = (v) >> 8; \ 2451 frm += 2; \ 2452 } while (0) 2453 struct ieee80211vap *vap = ni->ni_vap; 2454 uint16_t caps, extcaps; 2455 int rxmax, density; 2456 2457 /* HT capabilities */ 2458 caps = vap->iv_htcaps & 0xffff; 2459 /* 2460 * Note channel width depends on whether we are operating as 2461 * a sta or not. When operating as a sta we are generating 2462 * a request based on our desired configuration. Otherwise 2463 * we are operational and the channel attributes identify 2464 * how we've been setup (which might be different if a fixed 2465 * channel is specified). 2466 */ 2467 if (vap->iv_opmode == IEEE80211_M_STA) { 2468 /* override 20/40 use based on config */ 2469 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40) 2470 caps |= IEEE80211_HTCAP_CHWIDTH40; 2471 else 2472 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2473 /* use advertised setting (XXX locally constraint) */ 2474 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 2475 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 2476 } else { 2477 /* override 20/40 use based on current channel */ 2478 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2479 caps |= IEEE80211_HTCAP_CHWIDTH40; 2480 else 2481 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 2482 rxmax = vap->iv_ampdu_rxmax; 2483 density = vap->iv_ampdu_density; 2484 } 2485 /* adjust short GI based on channel and config */ 2486 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0) 2487 caps &= ~IEEE80211_HTCAP_SHORTGI20; 2488 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 || 2489 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 2490 caps &= ~IEEE80211_HTCAP_SHORTGI40; 2491 ADDSHORT(frm, caps); 2492 2493 /* HT parameters */ 2494 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 2495 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 2496 ; 2497 frm++; 2498 2499 /* pre-zero remainder of ie */ 2500 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 2501 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 2502 2503 /* supported MCS set */ 2504 /* 2505 * XXX it would better to get the rate set from ni_htrates 2506 * so we can restrict it but for sta mode ni_htrates isn't 2507 * setup when we're called to form an AssocReq frame so for 2508 * now we're restricted to the default HT rate set. 2509 */ 2510 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 2511 2512 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) - 2513 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 2514 2515 /* HT extended capabilities */ 2516 extcaps = vap->iv_htextcaps & 0xffff; 2517 2518 ADDSHORT(frm, extcaps); 2519 2520 frm += sizeof(struct ieee80211_ie_htcap) - 2521 __offsetof(struct ieee80211_ie_htcap, hc_txbf); 2522 2523 return frm; 2524 #undef ADDSHORT 2525 } 2526 2527 /* 2528 * Add 802.11n HT capabilities information element 2529 */ 2530 uint8_t * 2531 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 2532 { 2533 frm[0] = IEEE80211_ELEMID_HTCAP; 2534 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 2535 return ieee80211_add_htcap_body(frm + 2, ni); 2536 } 2537 2538 /* 2539 * Add Broadcom OUI wrapped standard HTCAP ie; this is 2540 * used for compatibility w/ pre-draft implementations. 2541 */ 2542 uint8_t * 2543 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 2544 { 2545 frm[0] = IEEE80211_ELEMID_VENDOR; 2546 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 2547 frm[2] = (BCM_OUI >> 0) & 0xff; 2548 frm[3] = (BCM_OUI >> 8) & 0xff; 2549 frm[4] = (BCM_OUI >> 16) & 0xff; 2550 frm[5] = BCM_OUI_HTCAP; 2551 return ieee80211_add_htcap_body(frm + 6, ni); 2552 } 2553 2554 /* 2555 * Construct the MCS bit mask of basic rates 2556 * for inclusion in an HT information element. 2557 */ 2558 static void 2559 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 2560 { 2561 int i; 2562 2563 for (i = 0; i < rs->rs_nrates; i++) { 2564 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 2565 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 2566 r < IEEE80211_HTRATE_MAXSIZE) { 2567 /* NB: this assumes a particular implementation */ 2568 setbit(frm, r); 2569 } 2570 } 2571 } 2572 2573 /* 2574 * Update the HTINFO ie for a beacon frame. 2575 */ 2576 void 2577 ieee80211_ht_update_beacon(struct ieee80211vap *vap, 2578 struct ieee80211_beacon_offsets *bo) 2579 { 2580 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 2581 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan; 2582 struct ieee80211com *ic = vap->iv_ic; 2583 struct ieee80211_ie_htinfo *ht = 2584 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 2585 2586 /* XXX only update on channel change */ 2587 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan); 2588 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 2589 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM; 2590 else 2591 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 2592 if (IEEE80211_IS_CHAN_HT40U(bsschan)) 2593 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2594 else if (IEEE80211_IS_CHAN_HT40D(bsschan)) 2595 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2596 else 2597 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 2598 if (IEEE80211_IS_CHAN_HT40(bsschan)) 2599 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 2600 2601 /* protection mode */ 2602 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 2603 2604 /* XXX propagate to vendor ie's */ 2605 #undef PROTMODE 2606 } 2607 2608 /* 2609 * Add body of an HTINFO information element. 2610 * 2611 * NB: We don't use struct ieee80211_ie_htinfo because we can 2612 * be called to fillin both a standard ie and a compat ie that 2613 * has a vendor OUI at the front. 2614 */ 2615 static uint8_t * 2616 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 2617 { 2618 struct ieee80211vap *vap = ni->ni_vap; 2619 struct ieee80211com *ic = ni->ni_ic; 2620 2621 /* pre-zero remainder of ie */ 2622 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 2623 2624 /* primary/control channel center */ 2625 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2626 2627 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS) 2628 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM; 2629 else 2630 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 2631 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 2632 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 2633 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 2634 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 2635 else 2636 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 2637 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) 2638 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 2639 2640 frm[1] = ic->ic_curhtprotmode; 2641 2642 frm += 5; 2643 2644 /* basic MCS set */ 2645 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 2646 frm += sizeof(struct ieee80211_ie_htinfo) - 2647 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 2648 return frm; 2649 } 2650 2651 /* 2652 * Add 802.11n HT information information element. 2653 */ 2654 uint8_t * 2655 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 2656 { 2657 frm[0] = IEEE80211_ELEMID_HTINFO; 2658 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 2659 return ieee80211_add_htinfo_body(frm + 2, ni); 2660 } 2661 2662 /* 2663 * Add Broadcom OUI wrapped standard HTINFO ie; this is 2664 * used for compatibility w/ pre-draft implementations. 2665 */ 2666 uint8_t * 2667 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 2668 { 2669 frm[0] = IEEE80211_ELEMID_VENDOR; 2670 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 2671 frm[2] = (BCM_OUI >> 0) & 0xff; 2672 frm[3] = (BCM_OUI >> 8) & 0xff; 2673 frm[4] = (BCM_OUI >> 16) & 0xff; 2674 frm[5] = BCM_OUI_HTINFO; 2675 return ieee80211_add_htinfo_body(frm + 6, ni); 2676 } 2677