1 /*- 2 * Copyright (c) 2007 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 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/systm.h> 40 #include <sys/endian.h> 41 42 #include <sys/socket.h> 43 44 #include <net/if.h> 45 #include <net/if_media.h> 46 #include <net/ethernet.h> 47 48 #include <net80211/ieee80211_var.h> 49 50 /* define here, used throughout file */ 51 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 52 #define SM(_v, _f) (((_v) << _f##_S) & _f) 53 54 /* XXX need max array size */ 55 /* NB: these are for HT20 w/ long GI */ 56 const int ieee80211_htrates[16] = { 57 13, /* IFM_IEEE80211_MCS0 */ 58 26, /* IFM_IEEE80211_MCS1 */ 59 39, /* IFM_IEEE80211_MCS2 */ 60 52, /* IFM_IEEE80211_MCS3 */ 61 78, /* IFM_IEEE80211_MCS4 */ 62 104, /* IFM_IEEE80211_MCS5 */ 63 117, /* IFM_IEEE80211_MCS6 */ 64 130, /* IFM_IEEE80211_MCS7 */ 65 26, /* IFM_IEEE80211_MCS8 */ 66 52, /* IFM_IEEE80211_MCS9 */ 67 78, /* IFM_IEEE80211_MCS10 */ 68 104, /* IFM_IEEE80211_MCS11 */ 69 156, /* IFM_IEEE80211_MCS12 */ 70 208, /* IFM_IEEE80211_MCS13 */ 71 234, /* IFM_IEEE80211_MCS14 */ 72 260, /* IFM_IEEE80211_MCS15 */ 73 }; 74 75 static const struct ieee80211_htrateset ieee80211_rateset_11n = 76 { 16, { 77 /* MCS: 6.5 13 19.5 26 39 52 58.5 65 13 26 */ 78 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 79 /* 39 52 78 104 117, 130 */ 80 10, 11, 12, 13, 14, 15 } 81 }; 82 83 #ifdef IEEE80211_AMPDU_AGE 84 /* XXX public for sysctl hookup */ 85 int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */ 86 #endif 87 int ieee80211_recv_bar_ena = 1; 88 89 #define IEEE80211_AGGR_TIMEOUT msecs_to_ticks(250) 90 #define IEEE80211_AGGR_MINRETRY msecs_to_ticks(10*1000) 91 #define IEEE80211_AGGR_MAXTRIES 3 92 93 static int ieee80211_addba_request(struct ieee80211_node *ni, 94 struct ieee80211_tx_ampdu *tap, 95 int dialogtoken, int baparamset, int batimeout); 96 static int ieee80211_addba_response(struct ieee80211_node *ni, 97 struct ieee80211_tx_ampdu *tap, 98 int code, int baparamset, int batimeout); 99 static void ieee80211_addba_stop(struct ieee80211_node *ni, 100 struct ieee80211_tx_ampdu *tap); 101 static void ieee80211_aggr_recv_action(struct ieee80211_node *ni, 102 const uint8_t *frm, const uint8_t *efrm); 103 104 void 105 ieee80211_ht_attach(struct ieee80211com *ic) 106 { 107 #ifdef IEEE80211_AMPDU_AGE 108 if (ieee80211_ampdu_age == -1) 109 ieee80211_ampdu_age = msecs_to_ticks(500); 110 #endif 111 112 /* setup default aggregation policy */ 113 ic->ic_recv_action = ieee80211_aggr_recv_action; 114 ic->ic_send_action = ieee80211_send_action; 115 ic->ic_addba_request = ieee80211_addba_request; 116 ic->ic_addba_response = ieee80211_addba_response; 117 ic->ic_addba_stop = ieee80211_addba_stop; 118 119 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS; 120 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE; 121 122 /* XXX get from driver */ 123 ic->ic_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K; 124 ic->ic_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA; 125 ic->ic_ampdu_limit = ic->ic_ampdu_rxmax; 126 ic->ic_amsdu_limit = IEEE80211_HTCAP_MAXAMSDU_3839; 127 128 if (ic->ic_htcaps & IEEE80211_HTC_HT) { 129 /* 130 * Device is HT capable; enable all HT-related 131 * facilities by default. 132 * XXX these choices may be too aggressive. 133 */ 134 ic->ic_flags_ext |= IEEE80211_FEXT_HT 135 | IEEE80211_FEXT_HTCOMPAT 136 ; 137 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) 138 ic->ic_flags_ext |= IEEE80211_FEXT_SHORTGI20; 139 /* XXX infer from channel list? */ 140 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) { 141 ic->ic_flags_ext |= IEEE80211_FEXT_USEHT40; 142 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40) 143 ic->ic_flags_ext |= IEEE80211_FEXT_SHORTGI40; 144 } 145 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */ 146 ic->ic_flags_ext |= IEEE80211_FEXT_AMPDU_RX; 147 if (ic->ic_htcaps & IEEE80211_HTC_AMPDU) 148 ic->ic_flags_ext |= IEEE80211_FEXT_AMPDU_TX; 149 ic->ic_flags_ext |= IEEE80211_FEXT_AMSDU_RX; 150 if (ic->ic_htcaps & IEEE80211_HTC_AMSDU) 151 ic->ic_flags_ext |= IEEE80211_FEXT_AMSDU_TX; 152 } 153 } 154 155 void 156 ieee80211_ht_detach(struct ieee80211com *ic) 157 { 158 } 159 160 static void 161 ht_announce(struct ieee80211com *ic, int mode, 162 const struct ieee80211_htrateset *rs) 163 { 164 struct ifnet *ifp = ic->ic_ifp; 165 int i, rate, mword; 166 167 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]); 168 for (i = 0; i < rs->rs_nrates; i++) { 169 mword = ieee80211_rate2media(ic, 170 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode); 171 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS) 172 continue; 173 rate = ieee80211_htrates[rs->rs_rates[i]]; 174 printf("%s%d%sMbps", (i != 0 ? " " : ""), 175 rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); 176 } 177 printf("\n"); 178 } 179 180 void 181 ieee80211_ht_announce(struct ieee80211com *ic) 182 { 183 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA)) 184 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n); 185 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) 186 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n); 187 } 188 189 const struct ieee80211_htrateset * 190 ieee80211_get_suphtrates(struct ieee80211com *ic, 191 const struct ieee80211_channel *c) 192 { 193 return &ieee80211_rateset_11n; 194 } 195 196 /* 197 * Receive processing. 198 */ 199 200 /* 201 * Decap the encapsulated A-MSDU frames and dispatch all but 202 * the last for delivery. The last frame is returned for 203 * delivery via the normal path. 204 */ 205 struct mbuf * 206 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m) 207 { 208 struct ieee80211com *ic = ni->ni_ic; 209 int framelen; 210 struct mbuf *n; 211 212 /* discard 802.3 header inserted by ieee80211_decap */ 213 m_adj(m, sizeof(struct ether_header)); 214 215 ic->ic_stats.is_amsdu_decap++; 216 217 for (;;) { 218 /* 219 * Decap the first frame, bust it apart from the 220 * remainder and deliver. We leave the last frame 221 * delivery to the caller (for consistency with other 222 * code paths, could also do it here). 223 */ 224 m = ieee80211_decap1(m, &framelen); 225 if (m == NULL) { 226 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 227 ni->ni_macaddr, "a-msdu", "%s", "decap failed"); 228 ic->ic_stats.is_amsdu_tooshort++; 229 return NULL; 230 } 231 if (m->m_pkthdr.len == framelen) 232 break; 233 n = m_split(m, framelen, M_NOWAIT); 234 if (n == NULL) { 235 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, 236 ni->ni_macaddr, "a-msdu", 237 "%s", "unable to split encapsulated frames"); 238 ic->ic_stats.is_amsdu_split++; 239 m_freem(m); /* NB: must reclaim */ 240 return NULL; 241 } 242 ieee80211_deliver_data(ic, ni, m); 243 244 /* 245 * Remove frame contents; each intermediate frame 246 * is required to be aligned to a 4-byte boundary. 247 */ 248 m = n; 249 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */ 250 } 251 return m; /* last delivered by caller */ 252 } 253 254 /* 255 * Start A-MPDU rx/re-order processing for the specified TID. 256 */ 257 static void 258 ampdu_rx_start(struct ieee80211_rx_ampdu *rap, int bufsiz, int start) 259 { 260 memset(rap, 0, sizeof(*rap)); 261 rap->rxa_wnd = (bufsiz == 0) ? 262 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 263 rap->rxa_start = start; 264 rap->rxa_flags |= IEEE80211_AGGR_XCHGPEND; 265 } 266 267 /* 268 * Purge all frames in the A-MPDU re-order queue. 269 */ 270 static void 271 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap) 272 { 273 struct mbuf *m; 274 int i; 275 276 for (i = 0; i < rap->rxa_wnd; i++) { 277 m = rap->rxa_m[i]; 278 if (m != NULL) { 279 rap->rxa_m[i] = NULL; 280 rap->rxa_qbytes -= m->m_pkthdr.len; 281 m_freem(m); 282 if (--rap->rxa_qframes == 0) 283 break; 284 } 285 } 286 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0, 287 ("lost %u data, %u frames on ampdu rx q", 288 rap->rxa_qbytes, rap->rxa_qframes)); 289 } 290 291 /* 292 * Stop A-MPDU rx processing for the specified TID. 293 */ 294 static void 295 ampdu_rx_stop(struct ieee80211_rx_ampdu *rap) 296 { 297 rap->rxa_flags &= ~IEEE80211_AGGR_XCHGPEND; 298 ampdu_rx_purge(rap); 299 } 300 301 /* 302 * Dispatch a frame from the A-MPDU reorder queue. The 303 * frame is fed back into ieee80211_input marked with an 304 * M_AMPDU flag so it doesn't come back to us (it also 305 * permits ieee80211_input to optimize re-processing). 306 */ 307 static __inline void 308 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m) 309 { 310 m->m_flags |= M_AMPDU; /* bypass normal processing */ 311 /* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU set */ 312 (void) ieee80211_input(ni->ni_ic, m, ni, 0, 0, 0); 313 } 314 315 /* 316 * Dispatch as many frames as possible from the re-order queue. 317 * Frames will always be "at the front"; we process all frames 318 * up to the first empty slot in the window. On completion we 319 * cleanup state if there are still pending frames in the current 320 * BA window. We assume the frame at slot 0 is already handled 321 * by the caller; we always start at slot 1. 322 */ 323 static void 324 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni) 325 { 326 struct ieee80211com *ic = ni->ni_ic; 327 struct mbuf *m; 328 int i; 329 330 /* flush run of frames */ 331 for (i = 1; i < rap->rxa_wnd; i++) { 332 m = rap->rxa_m[i]; 333 if (m == NULL) 334 break; 335 rap->rxa_m[i] = NULL; 336 rap->rxa_qbytes -= m->m_pkthdr.len; 337 rap->rxa_qframes--; 338 339 ampdu_dispatch(ni, m); 340 } 341 /* 342 * If frames remain, copy the mbuf pointers down so 343 * they correspond to the offsets in the new window. 344 */ 345 if (rap->rxa_qframes != 0) { 346 int n = rap->rxa_qframes, j; 347 for (j = i+1; j < rap->rxa_wnd; j++) { 348 if (rap->rxa_m[j] != NULL) { 349 rap->rxa_m[j-i] = rap->rxa_m[j]; 350 rap->rxa_m[j] = NULL; 351 if (--n == 0) 352 break; 353 } 354 } 355 KASSERT(n == 0, ("lost %d frames", n)); 356 ic->ic_stats.is_ampdu_rx_copy += rap->rxa_qframes; 357 } 358 /* 359 * Adjust the start of the BA window to 360 * reflect the frames just dispatched. 361 */ 362 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i); 363 ic->ic_stats.is_ampdu_rx_oor += i; 364 } 365 366 #ifdef IEEE80211_AMPDU_AGE 367 /* 368 * Dispatch all frames in the A-MPDU re-order queue. 369 */ 370 static void 371 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap) 372 { 373 struct ieee80211com *ic = ni->ni_ic; 374 struct mbuf *m; 375 int i; 376 377 for (i = 0; i < rap->rxa_wnd; i++) { 378 m = rap->rxa_m[i]; 379 if (m == NULL) 380 continue; 381 rap->rxa_m[i] = NULL; 382 rap->rxa_qbytes -= m->m_pkthdr.len; 383 rap->rxa_qframes--; 384 ic->ic_stats.is_ampdu_rx_oor++; 385 386 ampdu_dispatch(ni, m); 387 if (rap->rxa_qframes == 0) 388 break; 389 } 390 } 391 #endif /* IEEE80211_AMPDU_AGE */ 392 393 /* 394 * Dispatch all frames in the A-MPDU re-order queue 395 * preceding the specified sequence number. This logic 396 * handles window moves due to a received MSDU or BAR. 397 */ 398 static void 399 ampdu_rx_flush_upto(struct ieee80211_node *ni, 400 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart) 401 { 402 struct ieee80211com *ic = ni->ni_ic; 403 struct mbuf *m; 404 ieee80211_seq seqno; 405 int i; 406 407 /* 408 * Flush any complete MSDU's with a sequence number lower 409 * than winstart. Gaps may exist. Note that we may actually 410 * dispatch frames past winstart if a run continues; this is 411 * an optimization that avoids having to do a separate pass 412 * to dispatch frames after moving the BA window start. 413 */ 414 seqno = rap->rxa_start; 415 for (i = 0; i < rap->rxa_wnd; i++) { 416 m = rap->rxa_m[i]; 417 if (m != NULL) { 418 rap->rxa_m[i] = NULL; 419 rap->rxa_qbytes -= m->m_pkthdr.len; 420 rap->rxa_qframes--; 421 ic->ic_stats.is_ampdu_rx_oor++; 422 423 ampdu_dispatch(ni, m); 424 } else { 425 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart)) 426 break; 427 } 428 seqno = IEEE80211_SEQ_INC(seqno); 429 } 430 /* 431 * If frames remain, copy the mbuf pointers down so 432 * they correspond to the offsets in the new window. 433 */ 434 if (rap->rxa_qframes != 0) { 435 int n = rap->rxa_qframes, j; 436 for (j = i+1; j < rap->rxa_wnd; j++) { 437 if (rap->rxa_m[j] != NULL) { 438 rap->rxa_m[j-i] = rap->rxa_m[j]; 439 rap->rxa_m[j] = NULL; 440 if (--n == 0) 441 break; 442 } 443 } 444 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d " 445 "BA win <%d:%d> winstart %d", 446 __func__, n, rap->rxa_qframes, i, rap->rxa_start, 447 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 448 winstart)); 449 ic->ic_stats.is_ampdu_rx_copy += rap->rxa_qframes; 450 } 451 /* 452 * Move the start of the BA window; we use the 453 * sequence number of the last MSDU that was 454 * passed up the stack+1 or winstart if stopped on 455 * a gap in the reorder buffer. 456 */ 457 rap->rxa_start = seqno; 458 } 459 460 /* 461 * Process a received QoS data frame for an HT station. Handle 462 * A-MPDU reordering: if this frame is received out of order 463 * and falls within the BA window hold onto it. Otherwise if 464 * this frame completes a run, flush any pending frames. We 465 * return 1 if the frame is consumed. A 0 is returned if 466 * the frame should be processed normally by the caller. 467 */ 468 int 469 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m) 470 { 471 #define IEEE80211_FC0_QOSDATA \ 472 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0) 473 #define PROCESS 0 /* caller should process frame */ 474 #define CONSUMED 1 /* frame consumed, caller does nothing */ 475 struct ieee80211com *ic = ni->ni_ic; 476 struct ieee80211_qosframe *wh; 477 struct ieee80211_rx_ampdu *rap; 478 ieee80211_seq rxseq; 479 uint8_t tid; 480 int off; 481 482 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta")); 483 484 /* NB: m_len known to be sufficient */ 485 wh = mtod(m, struct ieee80211_qosframe *); 486 KASSERT(wh->i_fc[0] == IEEE80211_FC0_QOSDATA, ("not QoS data")); 487 488 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 489 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0]; 490 else 491 tid = wh->i_qos[0]; 492 tid &= IEEE80211_QOS_TID; 493 rap = &ni->ni_rx_ampdu[tid]; 494 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 495 /* 496 * No ADDBA request yet, don't touch. 497 */ 498 return PROCESS; 499 } 500 rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 501 rap->rxa_nframes++; 502 again: 503 if (rxseq == rap->rxa_start) { 504 /* 505 * First frame in window. 506 */ 507 if (rap->rxa_qframes != 0) { 508 /* 509 * Dispatch as many packets as we can. 510 */ 511 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup")); 512 ampdu_dispatch(ni, m); 513 ampdu_rx_dispatch(rap, ni); 514 return CONSUMED; 515 } else { 516 /* 517 * In order; advance window and notify 518 * caller to dispatch directly. 519 */ 520 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 521 return PROCESS; 522 } 523 } 524 /* 525 * Frame is out of order; store if in the BA window. 526 */ 527 /* calculate offset in BA window */ 528 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 529 if (off < rap->rxa_wnd) { 530 /* 531 * Common case (hopefully): in the BA window. 532 * Sec 9.10.7.6 a) (D2.04 p.118 line 47) 533 */ 534 #ifdef IEEE80211_AMPDU_AGE 535 /* 536 * Check for frames sitting too long in the reorder queue. 537 * This should only ever happen if frames are not delivered 538 * without the sender otherwise notifying us (e.g. with a 539 * BAR to move the window). Typically this happens because 540 * of vendor bugs that cause the sequence number to jump. 541 * When this happens we get a gap in the reorder queue that 542 * leaves frame sitting on the queue until they get pushed 543 * out due to window moves. When the vendor does not send 544 * BAR this move only happens due to explicit packet sends 545 * 546 * NB: we only track the time of the oldest frame in the 547 * reorder q; this means that if we flush we might push 548 * frames that still "new"; if this happens then subsequent 549 * frames will result in BA window moves which cost something 550 * but is still better than a big throughput dip. 551 */ 552 if (rap->rxa_qframes != 0) { 553 /* XXX honor batimeout? */ 554 if (ticks - rap->rxa_age > ieee80211_ampdu_age) { 555 /* 556 * Too long since we received the first 557 * frame; flush the reorder buffer. 558 */ 559 if (rap->rxa_qframes != 0) { 560 ic->ic_stats.is_ampdu_rx_age += 561 rap->rxa_qframes; 562 ampdu_rx_flush(ni, rap); 563 } 564 rap->rxa_start = IEEE80211_SEQ_INC(rxseq); 565 return PROCESS; 566 } 567 } else { 568 /* 569 * First frame, start aging timer. 570 */ 571 rap->rxa_age = ticks; 572 } 573 #endif /* IEEE80211_AMPDU_AGE */ 574 /* save packet */ 575 if (rap->rxa_m[off] == NULL) { 576 rap->rxa_m[off] = m; 577 rap->rxa_qframes++; 578 rap->rxa_qbytes += m->m_pkthdr.len; 579 ic->ic_stats.is_ampdu_rx_reorder++; 580 } else { 581 IEEE80211_DISCARD_MAC(ic, 582 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 583 ni->ni_macaddr, "a-mpdu duplicate", 584 "seqno %u tid %u BA win <%u:%u>", 585 rxseq, tid, rap->rxa_start, 586 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1)); 587 ic->ic_stats.is_rx_dup++; 588 IEEE80211_NODE_STAT(ni, rx_dup); 589 m_freem(m); 590 } 591 return CONSUMED; 592 } 593 if (off < IEEE80211_SEQ_BA_RANGE) { 594 /* 595 * Outside the BA window, but within range; 596 * flush the reorder q and move the window. 597 * Sec 9.10.7.6 b) (D2.04 p.118 line 60) 598 */ 599 IEEE80211_NOTE(ic, IEEE80211_MSG_11N, ni, 600 "move BA win <%u:%u> (%u frames) rxseq %u tid %u", 601 rap->rxa_start, 602 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 603 rap->rxa_qframes, rxseq, tid); 604 ic->ic_stats.is_ampdu_rx_move++; 605 606 /* 607 * The spec says to flush frames up to but not including: 608 * WinStart_B = rxseq - rap->rxa_wnd + 1 609 * Then insert the frame or notify the caller to process 610 * it immediately. We can safely do this by just starting 611 * over again because we know the frame will now be within 612 * the BA window. 613 */ 614 /* NB: rxa_wnd known to be >0 */ 615 ampdu_rx_flush_upto(ni, rap, 616 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1)); 617 goto again; 618 } else { 619 /* 620 * Outside the BA window and out of range; toss. 621 * Sec 9.10.7.6 c) (D2.04 p.119 line 16) 622 */ 623 IEEE80211_DISCARD_MAC(ic, 624 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 625 "MSDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 626 rap->rxa_start, 627 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 628 rap->rxa_qframes, rxseq, tid, 629 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 630 ic->ic_stats.is_ampdu_rx_drop++; 631 IEEE80211_NODE_STAT(ni, rx_drop); 632 m_freem(m); 633 return CONSUMED; 634 } 635 #undef CONSUMED 636 #undef PROCESS 637 #undef IEEE80211_FC0_QOSDATA 638 } 639 640 /* 641 * Process a BAR ctl frame. Dispatch all frames up to 642 * the sequence number of the frame. If this frame is 643 * out of range it's discarded. 644 */ 645 void 646 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0) 647 { 648 struct ieee80211com *ic = ni->ni_ic; 649 struct ieee80211_frame_bar *wh; 650 struct ieee80211_rx_ampdu *rap; 651 ieee80211_seq rxseq; 652 int tid, off; 653 654 if (!ieee80211_recv_bar_ena) { 655 #if 0 656 IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_11N, 657 ni->ni_macaddr, "BAR", "%s", "processing disabled"); 658 #endif 659 ic->ic_stats.is_ampdu_bar_bad++; 660 return; 661 } 662 wh = mtod(m0, struct ieee80211_frame_bar *); 663 /* XXX check basic BAR */ 664 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID); 665 rap = &ni->ni_rx_ampdu[tid]; 666 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 667 /* 668 * No ADDBA request yet, don't touch. 669 */ 670 IEEE80211_DISCARD_MAC(ic, 671 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, 672 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid); 673 ic->ic_stats.is_ampdu_bar_bad++; 674 return; 675 } 676 ic->ic_stats.is_ampdu_bar_rx++; 677 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; 678 if (rxseq == rap->rxa_start) 679 return; 680 /* calculate offset in BA window */ 681 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start); 682 if (off < IEEE80211_SEQ_BA_RANGE) { 683 /* 684 * Flush the reorder q up to rxseq and move the window. 685 * Sec 9.10.7.6 a) (D2.04 p.119 line 22) 686 */ 687 IEEE80211_NOTE(ic, IEEE80211_MSG_11N, ni, 688 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u", 689 rap->rxa_start, 690 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 691 rap->rxa_qframes, rxseq, tid); 692 ic->ic_stats.is_ampdu_bar_move++; 693 694 ampdu_rx_flush_upto(ni, rap, rxseq); 695 if (off >= rap->rxa_wnd) { 696 /* 697 * BAR specifies a window start to the right of BA 698 * window; we must move it explicitly since 699 * ampdu_rx_flush_upto will not. 700 */ 701 rap->rxa_start = rxseq; 702 } 703 } else { 704 /* 705 * Out of range; toss. 706 * Sec 9.10.7.6 b) (D2.04 p.119 line 41) 707 */ 708 IEEE80211_DISCARD_MAC(ic, 709 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr, 710 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s", 711 rap->rxa_start, 712 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1), 713 rap->rxa_qframes, rxseq, tid, 714 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : ""); 715 ic->ic_stats.is_ampdu_bar_oow++; 716 IEEE80211_NODE_STAT(ni, rx_drop); 717 } 718 } 719 720 /* 721 * Setup HT-specific state in a node. Called only 722 * when HT use is negotiated so we don't do extra 723 * work for temporary and/or legacy sta's. 724 */ 725 void 726 ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap) 727 { 728 struct ieee80211_tx_ampdu *tap; 729 int ac; 730 731 if (ni->ni_flags & IEEE80211_NODE_HT) { 732 /* 733 * Clean AMPDU state on re-associate. This handles the case 734 * where a station leaves w/o notifying us and then returns 735 * before node is reaped for inactivity. 736 */ 737 ieee80211_ht_node_cleanup(ni); 738 } 739 ieee80211_parse_htcap(ni, htcap); 740 for (ac = 0; ac < WME_NUM_AC; ac++) { 741 tap = &ni->ni_tx_ampdu[ac]; 742 tap->txa_ac = ac; 743 /* NB: further initialization deferred */ 744 } 745 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 746 } 747 748 /* 749 * Cleanup HT-specific state in a node. Called only 750 * when HT use has been marked. 751 */ 752 void 753 ieee80211_ht_node_cleanup(struct ieee80211_node *ni) 754 { 755 struct ieee80211com *ic = ni->ni_ic; 756 int i; 757 758 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node")); 759 760 /* XXX optimize this */ 761 for (i = 0; i < WME_NUM_AC; i++) { 762 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i]; 763 if (tap->txa_flags & IEEE80211_AGGR_SETUP) { 764 /* 765 * Stop BA stream if setup so driver has a chance 766 * to reclaim any resources it might have allocated. 767 */ 768 ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]); 769 IEEE80211_TAPQ_DESTROY(tap); 770 /* NB: clearing NAK means we may re-send ADDBA */ 771 tap->txa_flags &= 772 ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK); 773 } 774 } 775 for (i = 0; i < WME_NUM_TID; i++) 776 ampdu_rx_stop(&ni->ni_rx_ampdu[i]); 777 778 ni->ni_htcap = 0; 779 ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT | 780 IEEE80211_NODE_AMPDU); 781 } 782 783 static struct ieee80211_channel * 784 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags) 785 { 786 return ieee80211_find_channel(ic, c->ic_freq, 787 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags); 788 } 789 790 /* 791 * Adjust a channel to be HT/non-HT according to the vap's configuration. 792 */ 793 struct ieee80211_channel * 794 ieee80211_ht_adjust_channel(struct ieee80211com *ic, 795 struct ieee80211_channel *chan, int flags) 796 { 797 struct ieee80211_channel *c; 798 799 if (flags & IEEE80211_FEXT_HT) { 800 /* promote to HT if possible */ 801 if (flags & IEEE80211_FEXT_USEHT40) { 802 if (!IEEE80211_IS_CHAN_HT40(chan)) { 803 /* NB: arbitrarily pick ht40+ over ht40- */ 804 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U); 805 if (c == NULL) 806 c = findhtchan(ic, chan, 807 IEEE80211_CHAN_HT40D); 808 if (c == NULL) 809 c = findhtchan(ic, chan, 810 IEEE80211_CHAN_HT20); 811 if (c != NULL) 812 chan = c; 813 } 814 } else if (!IEEE80211_IS_CHAN_HT20(chan)) { 815 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20); 816 if (c != NULL) 817 chan = c; 818 } 819 } else if (IEEE80211_IS_CHAN_HT(chan)) { 820 /* demote to legacy, HT use is disabled */ 821 c = ieee80211_find_channel(ic, chan->ic_freq, 822 chan->ic_flags &~ IEEE80211_CHAN_HT); 823 if (c != NULL) 824 chan = c; 825 } 826 return chan; 827 } 828 829 /* 830 * Setup HT-specific state for a legacy WDS peer. 831 */ 832 void 833 ieee80211_ht_wds_init(struct ieee80211_node *ni) 834 { 835 struct ieee80211com *ic = ni->ni_ic; 836 struct ieee80211_tx_ampdu *tap; 837 int ac; 838 839 KASSERT(ic->ic_flags_ext & IEEE80211_FEXT_HT, ("no HT requested")); 840 841 /* XXX check scan cache in case peer has an ap and we have info */ 842 /* 843 * If setup with a legacy channel; locate an HT channel. 844 * Otherwise if the inherited channel (from a companion 845 * AP) is suitable use it so we use the same location 846 * for the extension channel). 847 */ 848 ni->ni_chan = ieee80211_ht_adjust_channel(ic, ni->ni_chan, 849 ic->ic_flags_ext); 850 851 ni->ni_htcap = 0; 852 if (ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI20) 853 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20; 854 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) { 855 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40; 856 ni->ni_chw = 40; 857 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan)) 858 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE; 859 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan)) 860 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW; 861 if (ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI40) 862 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40; 863 } else { 864 ni->ni_chw = 20; 865 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE; 866 } 867 ni->ni_htctlchan = ni->ni_chan->ic_ieee; 868 869 ni->ni_htopmode = 0; /* XXX need protection state */ 870 ni->ni_htstbc = 0; /* XXX need info */ 871 872 for (ac = 0; ac < WME_NUM_AC; ac++) { 873 tap = &ni->ni_tx_ampdu[ac]; 874 tap->txa_ac = ac; 875 } 876 /* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */ 877 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU; 878 } 879 880 /* 881 * Notify hostap vaps of a change in the HTINFO ie. 882 */ 883 static void 884 htinfo_notify(struct ieee80211com *ic) 885 { 886 if (ic->ic_opmode != IEEE80211_M_HOSTAP) 887 return; 888 IEEE80211_NOTE(ic, 889 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, 890 ic->ic_bss, 891 "HT bss occupancy change: %d sta, %d ht, " 892 "%d ht40%s, HT protmode now 0x%x" 893 , ic->ic_sta_assoc 894 , ic->ic_ht_sta_assoc 895 , ic->ic_ht40_sta_assoc 896 , (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ? 897 ", non-HT sta present" : "" 898 , ic->ic_curhtprotmode); 899 ieee80211_beacon_notify(ic, IEEE80211_BEACON_HTINFO); 900 } 901 902 /* 903 * Calculate HT protection mode from current 904 * state and handle updates. 905 */ 906 static void 907 htinfo_update(struct ieee80211com *ic) 908 { 909 uint8_t protmode; 910 911 if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) { 912 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT 913 | IEEE80211_HTINFO_NONHT_PRESENT; 914 } else if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) { 915 protmode = IEEE80211_HTINFO_OPMODE_MIXED 916 | IEEE80211_HTINFO_NONHT_PRESENT; 917 } else if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) && 918 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) { 919 protmode = IEEE80211_HTINFO_OPMODE_HT20PR; 920 } else { 921 protmode = IEEE80211_HTINFO_OPMODE_PURE; 922 } 923 if (protmode != ic->ic_curhtprotmode) { 924 ic->ic_curhtprotmode = protmode; 925 htinfo_notify(ic); 926 } 927 } 928 929 /* 930 * Handle an HT station joining a BSS. 931 */ 932 void 933 ieee80211_ht_node_join(struct ieee80211_node *ni) 934 { 935 struct ieee80211com *ic = ni->ni_ic; 936 937 IEEE80211_LOCK_ASSERT(ic); 938 939 if (ni->ni_flags & IEEE80211_NODE_HT) { 940 ic->ic_ht_sta_assoc++; 941 if (ni->ni_chw == 40) 942 ic->ic_ht40_sta_assoc++; 943 } 944 htinfo_update(ic); 945 } 946 947 /* 948 * Handle an HT station leaving a BSS. 949 */ 950 void 951 ieee80211_ht_node_leave(struct ieee80211_node *ni) 952 { 953 struct ieee80211com *ic = ni->ni_ic; 954 955 IEEE80211_LOCK_ASSERT(ic); 956 957 if (ni->ni_flags & IEEE80211_NODE_HT) { 958 ic->ic_ht_sta_assoc--; 959 if (ni->ni_chw == 40) 960 ic->ic_ht40_sta_assoc--; 961 } 962 htinfo_update(ic); 963 } 964 965 /* 966 * Public version of htinfo_update; used for processing 967 * beacon frames from overlapping bss in hostap_recv_mgmt. 968 */ 969 void 970 ieee80211_htinfo_update(struct ieee80211com *ic, int protmode) 971 { 972 if (protmode != ic->ic_curhtprotmode) { 973 ic->ic_curhtprotmode = protmode; 974 htinfo_notify(ic); 975 } 976 } 977 978 /* 979 * Time out presence of an overlapping bss with non-HT 980 * stations. When operating in hostap mode we listen for 981 * beacons from other stations and if we identify a non-HT 982 * station is present we update the opmode field of the 983 * HTINFO ie. To identify when all non-HT stations are 984 * gone we time out this condition. 985 */ 986 void 987 ieee80211_ht_timeout(struct ieee80211com *ic) 988 { 989 IEEE80211_LOCK_ASSERT(ic); 990 991 if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) && 992 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) { 993 #if 0 994 IEEE80211_NOTE(ic, IEEE80211_MSG_11N, ni, 995 "%s", "time out non-HT STA present on channel"); 996 #endif 997 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 998 htinfo_update(ic); 999 } 1000 } 1001 1002 /* unalligned little endian access */ 1003 #define LE_READ_2(p) \ 1004 ((uint16_t) \ 1005 ((((const uint8_t *)(p))[0] ) | \ 1006 (((const uint8_t *)(p))[1] << 8))) 1007 1008 /* 1009 * Process an 802.11n HT capabilities ie. 1010 */ 1011 void 1012 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie) 1013 { 1014 struct ieee80211com *ic = ni->ni_ic; 1015 1016 if (ie[0] == IEEE80211_ELEMID_VENDOR) { 1017 /* 1018 * Station used Vendor OUI ie to associate; 1019 * mark the node so when we respond we'll use 1020 * the Vendor OUI's and not the standard ie's. 1021 */ 1022 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT; 1023 ie += 4; 1024 } else 1025 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT; 1026 1027 ni->ni_htcap = LE_READ_2(ie + 1028 __offsetof(struct ieee80211_ie_htcap, hc_cap)); 1029 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)]; 1030 /* XXX needed or will ieee80211_parse_htinfo always be called? */ 1031 ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) && 1032 (ic->ic_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20; 1033 } 1034 1035 /* 1036 * Process an 802.11n HT info ie and update the node state. 1037 * Note that we handle use this information to identify the 1038 * correct channel (HT20, HT40+, HT40-, legacy). The caller 1039 * is responsible for insuring any required channel change is 1040 * done (e.g. in sta mode when parsing the contents of a 1041 * beacon frame). 1042 */ 1043 void 1044 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie) 1045 { 1046 struct ieee80211com *ic = ni->ni_ic; 1047 const struct ieee80211_ie_htinfo *htinfo; 1048 struct ieee80211_channel *c; 1049 uint16_t w; 1050 int htflags, chanflags; 1051 1052 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1053 ie += 4; 1054 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1055 ni->ni_htctlchan = htinfo->hi_ctrlchannel; 1056 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN); 1057 w = LE_READ_2(&htinfo->hi_byte2); 1058 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE); 1059 w = LE_READ_2(&htinfo->hi_byte45); 1060 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS); 1061 /* 1062 * Handle 11n channel switch. Use the received HT ie's to 1063 * identify the right channel to use. If we cannot locate it 1064 * in the channel table then fallback to legacy operation. 1065 */ 1066 htflags = (ic->ic_flags_ext & IEEE80211_FEXT_HT) ? 1067 IEEE80211_CHAN_HT20 : 0; 1068 /* NB: honor operating mode constraint */ 1069 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) && 1070 (ic->ic_flags_ext & IEEE80211_FEXT_USEHT40)) { 1071 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE) 1072 htflags = IEEE80211_CHAN_HT40U; 1073 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW) 1074 htflags = IEEE80211_CHAN_HT40D; 1075 } 1076 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags; 1077 if (chanflags != ni->ni_chan->ic_flags) { 1078 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags); 1079 if (c == NULL && htflags != IEEE80211_CHAN_HT20) { 1080 /* 1081 * No HT40 channel entry in our table; fall back 1082 * to HT20 operation. This should not happen. 1083 */ 1084 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20); 1085 IEEE80211_NOTE(ni->ni_ic, 1086 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1087 "no HT40 channel (freq %u), falling back to HT20", 1088 ni->ni_chan->ic_freq); 1089 /* XXX stat */ 1090 } 1091 if (c != NULL && c != ni->ni_chan) { 1092 IEEE80211_NOTE(ni->ni_ic, 1093 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 1094 "switch station to HT%d channel %u/0x%x", 1095 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20, 1096 c->ic_freq, c->ic_flags); 1097 ni->ni_chan = c; 1098 } 1099 /* NB: caller responsible for forcing any channel change */ 1100 } 1101 /* update node's tx channel width */ 1102 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20; 1103 } 1104 1105 /* 1106 * Install received HT rate set by parsing the HT cap ie. 1107 */ 1108 int 1109 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags) 1110 { 1111 struct ieee80211com *ic = ni->ni_ic; 1112 const struct ieee80211_ie_htcap *htcap; 1113 struct ieee80211_htrateset *rs; 1114 int i; 1115 1116 rs = &ni->ni_htrates; 1117 memset(rs, 0, sizeof(*rs)); 1118 if (ie != NULL) { 1119 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1120 ie += 4; 1121 htcap = (const struct ieee80211_ie_htcap *) ie; 1122 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1123 if (isclr(htcap->hc_mcsset, i)) 1124 continue; 1125 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) { 1126 IEEE80211_NOTE(ic, 1127 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1128 "WARNING, HT rate set too large; only " 1129 "using %u rates", IEEE80211_HTRATE_MAXSIZE); 1130 ic->ic_stats.is_rx_rstoobig++; 1131 break; 1132 } 1133 rs->rs_rates[rs->rs_nrates++] = i; 1134 } 1135 } 1136 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags); 1137 } 1138 1139 /* 1140 * Mark rates in a node's HT rate set as basic according 1141 * to the information in the supplied HT info ie. 1142 */ 1143 void 1144 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie) 1145 { 1146 const struct ieee80211_ie_htinfo *htinfo; 1147 struct ieee80211_htrateset *rs; 1148 int i, j; 1149 1150 if (ie[0] == IEEE80211_ELEMID_VENDOR) 1151 ie += 4; 1152 htinfo = (const struct ieee80211_ie_htinfo *) ie; 1153 rs = &ni->ni_htrates; 1154 if (rs->rs_nrates == 0) { 1155 IEEE80211_NOTE(ni->ni_ic, 1156 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni, 1157 "%s", "WARNING, empty HT rate set"); 1158 return; 1159 } 1160 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) { 1161 if (isclr(htinfo->hi_basicmcsset, i)) 1162 continue; 1163 for (j = 0; j < rs->rs_nrates; j++) 1164 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i) 1165 rs->rs_rates[j] |= IEEE80211_RATE_BASIC; 1166 } 1167 } 1168 1169 static void 1170 addba_timeout(void *arg) 1171 { 1172 struct ieee80211_tx_ampdu *tap = arg; 1173 1174 /* XXX ? */ 1175 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1176 tap->txa_attempts++; 1177 } 1178 1179 static void 1180 addba_start_timeout(struct ieee80211_tx_ampdu *tap) 1181 { 1182 /* XXX use CALLOUT_PENDING instead? */ 1183 callout_reset(&tap->txa_timer, IEEE80211_AGGR_TIMEOUT, 1184 addba_timeout, tap); 1185 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND; 1186 tap->txa_lastrequest = ticks; 1187 } 1188 1189 static void 1190 addba_stop_timeout(struct ieee80211_tx_ampdu *tap) 1191 { 1192 /* XXX use CALLOUT_PENDING instead? */ 1193 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) { 1194 callout_stop(&tap->txa_timer); 1195 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND; 1196 } 1197 } 1198 1199 /* 1200 * Default method for requesting A-MPDU tx aggregation. 1201 * We setup the specified state block and start a timer 1202 * to wait for an ADDBA response frame. 1203 */ 1204 static int 1205 ieee80211_addba_request(struct ieee80211_node *ni, 1206 struct ieee80211_tx_ampdu *tap, 1207 int dialogtoken, int baparamset, int batimeout) 1208 { 1209 int bufsiz; 1210 1211 /* XXX locking */ 1212 tap->txa_token = dialogtoken; 1213 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE; 1214 tap->txa_start = tap->txa_seqstart = 0; 1215 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1216 tap->txa_wnd = (bufsiz == 0) ? 1217 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1218 addba_start_timeout(tap); 1219 return 1; 1220 } 1221 1222 /* 1223 * Default method for processing an A-MPDU tx aggregation 1224 * response. We shutdown any pending timer and update the 1225 * state block according to the reply. 1226 */ 1227 static int 1228 ieee80211_addba_response(struct ieee80211_node *ni, 1229 struct ieee80211_tx_ampdu *tap, 1230 int status, int baparamset, int batimeout) 1231 { 1232 int bufsiz; 1233 1234 /* XXX locking */ 1235 addba_stop_timeout(tap); 1236 if (status == IEEE80211_STATUS_SUCCESS) { 1237 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1238 /* XXX override our request? */ 1239 tap->txa_wnd = (bufsiz == 0) ? 1240 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX); 1241 tap->txa_flags |= IEEE80211_AGGR_RUNNING; 1242 } else { 1243 /* mark tid so we don't try again */ 1244 tap->txa_flags |= IEEE80211_AGGR_NAK; 1245 } 1246 return 1; 1247 } 1248 1249 /* 1250 * Default method for stopping A-MPDU tx aggregation. 1251 * Any timer is cleared and we drain any pending frames. 1252 */ 1253 static void 1254 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1255 { 1256 /* XXX locking */ 1257 addba_stop_timeout(tap); 1258 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) { 1259 /* clear aggregation queue */ 1260 ieee80211_drain_ifq(&tap->txa_q); 1261 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING; 1262 } 1263 tap->txa_attempts = 0; 1264 } 1265 1266 /* 1267 * Process a received action frame using the default aggregation 1268 * policy. We intercept ADDBA-related frames and use them to 1269 * update our aggregation state. All other frames are passed up 1270 * for processing by ieee80211_recv_action. 1271 */ 1272 static void 1273 ieee80211_aggr_recv_action(struct ieee80211_node *ni, 1274 const uint8_t *frm, const uint8_t *efrm) 1275 { 1276 struct ieee80211com *ic = ni->ni_ic; 1277 const struct ieee80211_action *ia; 1278 struct ieee80211_rx_ampdu *rap; 1279 struct ieee80211_tx_ampdu *tap; 1280 uint8_t dialogtoken; 1281 uint16_t baparamset, batimeout, baseqctl, code; 1282 uint16_t args[4]; 1283 int tid, ac, bufsiz; 1284 1285 ia = (const struct ieee80211_action *) frm; 1286 switch (ia->ia_category) { 1287 case IEEE80211_ACTION_CAT_BA: 1288 switch (ia->ia_action) { 1289 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1290 dialogtoken = frm[2]; 1291 baparamset = LE_READ_2(frm+3); 1292 batimeout = LE_READ_2(frm+5); 1293 baseqctl = LE_READ_2(frm+7); 1294 1295 tid = MS(baparamset, IEEE80211_BAPS_TID); 1296 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1297 1298 IEEE80211_NOTE(ic, 1299 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1300 "recv ADDBA request: dialogtoken %u " 1301 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d " 1302 "baseqctl %d:%d", 1303 dialogtoken, baparamset, tid, bufsiz, batimeout, 1304 MS(baseqctl, IEEE80211_BASEQ_START), 1305 MS(baseqctl, IEEE80211_BASEQ_FRAG)); 1306 1307 rap = &ni->ni_rx_ampdu[tid]; 1308 1309 /* Send ADDBA response */ 1310 args[0] = dialogtoken; 1311 /* 1312 * NB: We ack only if the sta associated with HT and 1313 * the ap is configured to do AMPDU rx (the latter 1314 * violates the 11n spec and is mostly for testing). 1315 */ 1316 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) && 1317 (ic->ic_flags_ext & IEEE80211_FEXT_AMPDU_RX)) { 1318 ampdu_rx_start(rap, bufsiz, 1319 MS(baseqctl, IEEE80211_BASEQ_START)); 1320 1321 args[1] = IEEE80211_STATUS_SUCCESS; 1322 } else { 1323 IEEE80211_NOTE(ic, 1324 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1325 ni, "reject ADDBA request: %s", 1326 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ? 1327 "administratively disabled" : 1328 "not negotiated for station"); 1329 ic->ic_stats.is_addba_reject++; 1330 args[1] = IEEE80211_STATUS_UNSPECIFIED; 1331 } 1332 /* XXX honor rap flags? */ 1333 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE 1334 | SM(tid, IEEE80211_BAPS_TID) 1335 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ) 1336 ; 1337 args[3] = 0; 1338 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1339 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args); 1340 return; 1341 1342 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1343 dialogtoken = frm[2]; 1344 code = LE_READ_2(frm+3); 1345 baparamset = LE_READ_2(frm+5); 1346 tid = MS(baparamset, IEEE80211_BAPS_TID); 1347 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ); 1348 batimeout = LE_READ_2(frm+7); 1349 1350 ac = TID_TO_WME_AC(tid); 1351 tap = &ni->ni_tx_ampdu[ac]; 1352 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) { 1353 IEEE80211_DISCARD_MAC(ic, 1354 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1355 ni->ni_macaddr, "ADDBA response", 1356 "no pending ADDBA, tid %d dialogtoken %u " 1357 "code %d", tid, dialogtoken, code); 1358 ic->ic_stats.is_addba_norequest++; 1359 return; 1360 } 1361 if (dialogtoken != tap->txa_token) { 1362 IEEE80211_DISCARD_MAC(ic, 1363 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1364 ni->ni_macaddr, "ADDBA response", 1365 "dialogtoken mismatch: waiting for %d, " 1366 "received %d, tid %d code %d", 1367 tap->txa_token, dialogtoken, tid, code); 1368 ic->ic_stats.is_addba_badtoken++; 1369 return; 1370 } 1371 1372 IEEE80211_NOTE(ic, 1373 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1374 "recv ADDBA response: dialogtoken %u code %d " 1375 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d", 1376 dialogtoken, code, baparamset, tid, bufsiz, 1377 batimeout); 1378 ic->ic_addba_response(ni, tap, 1379 code, baparamset, batimeout); 1380 return; 1381 1382 case IEEE80211_ACTION_BA_DELBA: 1383 baparamset = LE_READ_2(frm+2); 1384 code = LE_READ_2(frm+4); 1385 1386 tid = MS(baparamset, IEEE80211_DELBAPS_TID); 1387 1388 IEEE80211_NOTE(ic, 1389 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1390 "recv DELBA: baparamset 0x%x (tid %d initiator %d) " 1391 "code %d", baparamset, tid, 1392 MS(baparamset, IEEE80211_DELBAPS_INIT), code); 1393 1394 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) { 1395 ac = TID_TO_WME_AC(tid); 1396 tap = &ni->ni_tx_ampdu[ac]; 1397 ic->ic_addba_stop(ni, tap); 1398 } else { 1399 rap = &ni->ni_rx_ampdu[tid]; 1400 ampdu_rx_stop(rap); 1401 } 1402 return; 1403 } 1404 break; 1405 } 1406 ieee80211_recv_action(ni, frm, efrm); 1407 } 1408 1409 /* 1410 * Process a received 802.11n action frame. 1411 * Aggregation-related frames are assumed to be handled 1412 * already; we handle any other frames we can, otherwise 1413 * complain about being unsupported (with debugging). 1414 */ 1415 void 1416 ieee80211_recv_action(struct ieee80211_node *ni, 1417 const uint8_t *frm, const uint8_t *efrm) 1418 { 1419 struct ieee80211com *ic = ni->ni_ic; 1420 const struct ieee80211_action *ia; 1421 int chw; 1422 1423 ia = (const struct ieee80211_action *) frm; 1424 switch (ia->ia_category) { 1425 case IEEE80211_ACTION_CAT_BA: 1426 IEEE80211_NOTE(ic, 1427 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1428 "%s: BA action %d not implemented", __func__, 1429 ia->ia_action); 1430 ic->ic_stats.is_rx_mgtdiscard++; 1431 break; 1432 case IEEE80211_ACTION_CAT_HT: 1433 switch (ia->ia_action) { 1434 case IEEE80211_ACTION_HT_TXCHWIDTH: 1435 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20; 1436 if (chw != ni->ni_chw) { 1437 ni->ni_chw = chw; 1438 ni->ni_flags |= IEEE80211_NODE_CHWUPDATE; 1439 } 1440 IEEE80211_NOTE(ic, 1441 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1442 "%s: HT txchwidth, width %d (%s)", 1443 __func__, chw, 1444 ni->ni_flags & IEEE80211_NODE_CHWUPDATE ? 1445 "new" : "no change"); 1446 break; 1447 case IEEE80211_ACTION_HT_MIMOPWRSAVE: 1448 IEEE80211_NOTE(ic, 1449 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1450 "%s: HT MIMO PS", __func__); 1451 break; 1452 default: 1453 IEEE80211_NOTE(ic, 1454 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1455 "%s: HT action %d not implemented", __func__, 1456 ia->ia_action); 1457 ic->ic_stats.is_rx_mgtdiscard++; 1458 break; 1459 } 1460 break; 1461 default: 1462 IEEE80211_NOTE(ic, 1463 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1464 "%s: category %d not implemented", __func__, 1465 ia->ia_category); 1466 ic->ic_stats.is_rx_mgtdiscard++; 1467 break; 1468 } 1469 } 1470 1471 /* 1472 * Transmit processing. 1473 */ 1474 1475 /* 1476 * Request A-MPDU tx aggregation. Setup local state and 1477 * issue an ADDBA request. BA use will only happen after 1478 * the other end replies with ADDBA response. 1479 */ 1480 int 1481 ieee80211_ampdu_request(struct ieee80211_node *ni, 1482 struct ieee80211_tx_ampdu *tap) 1483 { 1484 struct ieee80211com *ic = ni->ni_ic; 1485 uint16_t args[4]; 1486 int tid, dialogtoken; 1487 static int tokens = 0; /* XXX */ 1488 1489 /* XXX locking */ 1490 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) { 1491 /* do deferred setup of state */ 1492 IEEE80211_TAPQ_INIT(tap); 1493 callout_init(&tap->txa_timer, CALLOUT_MPSAFE); 1494 tap->txa_flags |= IEEE80211_AGGR_SETUP; 1495 } 1496 if (tap->txa_attempts >= IEEE80211_AGGR_MAXTRIES && 1497 (ticks - tap->txa_lastrequest) < IEEE80211_AGGR_MINRETRY) { 1498 /* 1499 * Don't retry too often; IEEE80211_AGGR_MINRETRY 1500 * defines the minimum interval we'll retry after 1501 * IEEE80211_AGGR_MAXTRIES failed attempts to 1502 * negotiate use. 1503 */ 1504 return 0; 1505 } 1506 /* XXX hack for not doing proper locking */ 1507 tap->txa_flags &= ~IEEE80211_AGGR_NAK; 1508 1509 dialogtoken = (tokens+1) % 63; /* XXX */ 1510 1511 tid = WME_AC_TO_TID(tap->txa_ac); 1512 args[0] = dialogtoken; 1513 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE 1514 | SM(tid, IEEE80211_BAPS_TID) 1515 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ) 1516 ; 1517 args[2] = 0; /* batimeout */ 1518 args[3] = SM(0, IEEE80211_BASEQ_START) 1519 | SM(0, IEEE80211_BASEQ_FRAG) 1520 ; 1521 /* NB: do first so there's no race against reply */ 1522 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) { 1523 /* unable to setup state, don't make request */ 1524 IEEE80211_NOTE(ni->ni_ic, IEEE80211_MSG_11N, 1525 ni, "%s: could not setup BA stream for AC %d", 1526 __func__, tap->txa_ac); 1527 /* defer next try so we don't slam the driver with requests */ 1528 tap->txa_attempts = IEEE80211_AGGR_MAXTRIES; 1529 tap->txa_lastrequest = ticks; 1530 return 0; 1531 } 1532 tokens = dialogtoken; /* allocate token */ 1533 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA, 1534 IEEE80211_ACTION_BA_ADDBA_REQUEST, args); 1535 } 1536 1537 /* 1538 * Terminate an AMPDU tx stream. State is reclaimed 1539 * and the peer notified with a DelBA Action frame. 1540 */ 1541 void 1542 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap) 1543 { 1544 struct ieee80211com *ic = ni->ni_ic; 1545 uint16_t args[4]; 1546 1547 /* XXX locking */ 1548 if (IEEE80211_AMPDU_RUNNING(tap)) { 1549 IEEE80211_NOTE(ic, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1550 ni, "%s: stop BA stream for AC %d", __func__, tap->txa_ac); 1551 ic->ic_stats.is_ampdu_stop++; 1552 1553 ic->ic_addba_stop(ni, tap); 1554 args[0] = WME_AC_TO_TID(tap->txa_ac); 1555 args[1] = IEEE80211_DELBAPS_INIT; 1556 args[2] = 1; /* XXX reason code */ 1557 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA, 1558 IEEE80211_ACTION_BA_DELBA, args); 1559 } else { 1560 IEEE80211_NOTE(ic, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1561 ni, "%s: BA stream for AC %d not running", 1562 __func__, tap->txa_ac); 1563 ic->ic_stats.is_ampdu_stop_failed++; 1564 } 1565 } 1566 1567 /* 1568 * Transmit a BAR frame to the specified node. The 1569 * BAR contents are drawn from the supplied aggregation 1570 * state associated with the node. 1571 */ 1572 int 1573 ieee80211_send_bar(struct ieee80211_node *ni, 1574 const struct ieee80211_tx_ampdu *tap) 1575 { 1576 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1577 #define ADDSHORT(frm, v) do { \ 1578 frm[0] = (v) & 0xff; \ 1579 frm[1] = (v) >> 8; \ 1580 frm += 2; \ 1581 } while (0) 1582 struct ieee80211com *ic = ni->ni_ic; 1583 struct ifnet *ifp = ic->ic_ifp; 1584 struct ieee80211_frame_min *wh; 1585 struct mbuf *m; 1586 uint8_t *frm; 1587 uint16_t barctl, barseqctl; 1588 int tid, ret; 1589 1590 ieee80211_ref_node(ni); 1591 1592 m = ieee80211_getmgtframe(&frm, 1593 ic->ic_headroom + sizeof(struct ieee80211_frame_min), 1594 sizeof(struct ieee80211_ba_request) 1595 ); 1596 if (m == NULL) 1597 senderr(ENOMEM, is_tx_nobuf); 1598 1599 wh = mtod(m, struct ieee80211_frame_min *); 1600 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | 1601 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR; 1602 wh->i_fc[1] = 0; 1603 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1604 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1605 1606 tid = WME_AC_TO_TID(tap->txa_ac); 1607 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ? 1608 IEEE80211_BAPS_POLICY_IMMEDIATE : 1609 IEEE80211_BAPS_POLICY_DELAYED) 1610 | SM(tid, IEEE80211_BAPS_TID) 1611 | SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ) 1612 ; 1613 barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START) 1614 | SM(0, IEEE80211_BASEQ_FRAG) 1615 ; 1616 ADDSHORT(frm, barctl); 1617 ADDSHORT(frm, barseqctl); 1618 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1619 1620 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */ 1621 1622 IEEE80211_NOTE(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1623 ni, "send bar frame (tid %u start %u) on channel %u", 1624 tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan)); 1625 1626 m->m_pkthdr.rcvif = (void *)ni; 1627 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 1628 if_start(ifp); 1629 1630 return 0; 1631 bad: 1632 ieee80211_free_node(ni); 1633 return ret; 1634 #undef ADDSHORT 1635 #undef senderr 1636 } 1637 1638 /* 1639 * Send an action management frame. The arguments are stuff 1640 * into a frame without inspection; the caller is assumed to 1641 * prepare them carefully (e.g. based on the aggregation state). 1642 */ 1643 int 1644 ieee80211_send_action(struct ieee80211_node *ni, 1645 int category, int action, uint16_t args[4]) 1646 { 1647 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1648 #define ADDSHORT(frm, v) do { \ 1649 frm[0] = (v) & 0xff; \ 1650 frm[1] = (v) >> 8; \ 1651 frm += 2; \ 1652 } while (0) 1653 struct ieee80211com *ic = ni->ni_ic; 1654 struct mbuf *m; 1655 uint8_t *frm; 1656 uint16_t baparamset; 1657 int ret; 1658 1659 KASSERT(ni != NULL, ("null node")); 1660 1661 /* 1662 * Hold a reference on the node so it doesn't go away until after 1663 * the xmit is complete all the way in the driver. On error we 1664 * will remove our reference. 1665 */ 1666 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1667 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1668 __func__, __LINE__, 1669 ni, ether_sprintf(ni->ni_macaddr), 1670 ieee80211_node_refcnt(ni)+1); 1671 ieee80211_ref_node(ni); 1672 1673 m = ieee80211_getmgtframe(&frm, 1674 ic->ic_headroom + sizeof(struct ieee80211_frame), 1675 sizeof(uint16_t) /* action+category */ 1676 /* XXX may action payload */ 1677 + sizeof(struct ieee80211_action_ba_addbaresponse) 1678 ); 1679 if (m == NULL) 1680 senderr(ENOMEM, is_tx_nobuf); 1681 1682 *frm++ = category; 1683 *frm++ = action; 1684 switch (category) { 1685 case IEEE80211_ACTION_CAT_BA: 1686 switch (action) { 1687 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 1688 IEEE80211_NOTE(ic, 1689 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1690 "send ADDBA request: dialogtoken %d " 1691 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x", 1692 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID), 1693 args[2], args[3]); 1694 1695 *frm++ = args[0]; /* dialog token */ 1696 ADDSHORT(frm, args[1]); /* baparamset */ 1697 ADDSHORT(frm, args[2]); /* batimeout */ 1698 ADDSHORT(frm, args[3]); /* baseqctl */ 1699 break; 1700 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 1701 IEEE80211_NOTE(ic, 1702 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1703 "send ADDBA response: dialogtoken %d status %d " 1704 "baparamset 0x%x (tid %d) batimeout %d", 1705 args[0], args[1], args[2], 1706 MS(args[2], IEEE80211_BAPS_TID), args[3]); 1707 1708 *frm++ = args[0]; /* dialog token */ 1709 ADDSHORT(frm, args[1]); /* statuscode */ 1710 ADDSHORT(frm, args[2]); /* baparamset */ 1711 ADDSHORT(frm, args[3]); /* batimeout */ 1712 break; 1713 case IEEE80211_ACTION_BA_DELBA: 1714 /* XXX */ 1715 baparamset = SM(args[0], IEEE80211_DELBAPS_TID) 1716 | SM(args[1], IEEE80211_DELBAPS_INIT) 1717 ; 1718 ADDSHORT(frm, baparamset); 1719 ADDSHORT(frm, args[2]); /* reason code */ 1720 1721 IEEE80211_NOTE(ic, 1722 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1723 "send DELBA action: tid %d, initiator %d reason %d", 1724 args[0], args[1], args[2]); 1725 break; 1726 default: 1727 goto badaction; 1728 } 1729 break; 1730 case IEEE80211_ACTION_CAT_HT: 1731 switch (action) { 1732 case IEEE80211_ACTION_HT_TXCHWIDTH: 1733 IEEE80211_NOTE(ic, 1734 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, 1735 ni, "send HT txchwidth: width %d", 1736 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) ? 40 : 20 1737 ); 1738 *frm++ = IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) ? 1739 IEEE80211_A_HT_TXCHWIDTH_2040 : 1740 IEEE80211_A_HT_TXCHWIDTH_20; 1741 break; 1742 default: 1743 goto badaction; 1744 } 1745 break; 1746 default: 1747 badaction: 1748 IEEE80211_NOTE(ic, 1749 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni, 1750 "%s: unsupported category %d action %d", __func__, 1751 category, action); 1752 senderr(EINVAL, is_tx_unknownmgt); 1753 /* NOTREACHED */ 1754 } 1755 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1756 1757 ret = ieee80211_mgmt_output(ic, ni, m, IEEE80211_FC0_SUBTYPE_ACTION); 1758 if (ret != 0) 1759 goto bad; 1760 return 0; 1761 bad: 1762 ieee80211_free_node(ni); 1763 return ret; 1764 #undef ADDSHORT 1765 #undef senderr 1766 } 1767 1768 /* 1769 * Construct the MCS bit mask for inclusion 1770 * in an HT information element. 1771 */ 1772 static void 1773 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1774 { 1775 int i; 1776 1777 for (i = 0; i < rs->rs_nrates; i++) { 1778 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1779 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */ 1780 /* NB: this assumes a particular implementation */ 1781 setbit(frm, r); 1782 } 1783 } 1784 } 1785 1786 /* 1787 * Add body of an HTCAP information element. 1788 */ 1789 static uint8_t * 1790 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni) 1791 { 1792 #define ADDSHORT(frm, v) do { \ 1793 frm[0] = (v) & 0xff; \ 1794 frm[1] = (v) >> 8; \ 1795 frm += 2; \ 1796 } while (0) 1797 struct ieee80211com *ic = ni->ni_ic; 1798 uint16_t caps; 1799 int rxmax, density; 1800 1801 /* HT capabilities */ 1802 caps = ic->ic_htcaps & 0xffff; 1803 /* 1804 * Note channel width depends on whether we are operating as 1805 * a sta or not. When operating as a sta we are generating 1806 * a request based on our desired configuration. Otherwise 1807 * we are operational and the channel attributes identify 1808 * how we've been setup (which might be different if a fixed 1809 * channel is specified). 1810 */ 1811 if (ic->ic_opmode == IEEE80211_M_STA) { 1812 /* override 20/40 use based on config */ 1813 if (ic->ic_flags_ext & IEEE80211_FEXT_USEHT40) 1814 caps |= IEEE80211_HTCAP_CHWIDTH40; 1815 else 1816 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1817 /* use advertised setting (XXX locally constraint) */ 1818 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU); 1819 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 1820 } else { 1821 /* override 20/40 use based on current channel */ 1822 if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan)) 1823 caps |= IEEE80211_HTCAP_CHWIDTH40; 1824 else 1825 caps &= ~IEEE80211_HTCAP_CHWIDTH40; 1826 rxmax = ic->ic_ampdu_rxmax; 1827 density = ic->ic_ampdu_density; 1828 } 1829 /* adjust short GI based on channel and config */ 1830 if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0) 1831 caps &= ~IEEE80211_HTCAP_SHORTGI20; 1832 if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 || 1833 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0) 1834 caps &= ~IEEE80211_HTCAP_SHORTGI40; 1835 ADDSHORT(frm, caps); 1836 1837 /* HT parameters */ 1838 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU) 1839 | SM(density, IEEE80211_HTCAP_MPDUDENSITY) 1840 ; 1841 frm++; 1842 1843 /* pre-zero remainder of ie */ 1844 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) - 1845 __offsetof(struct ieee80211_ie_htcap, hc_mcsset)); 1846 1847 /* supported MCS set */ 1848 /* 1849 * XXX it would better to get the rate set from ni_htrates 1850 * so we can restrict it but for sta mode ni_htrates isn't 1851 * setup when we're called to form an AssocReq frame so for 1852 * now we're restricted to the default HT rate set. 1853 */ 1854 ieee80211_set_htrates(frm, &ieee80211_rateset_11n); 1855 1856 frm += sizeof(struct ieee80211_ie_htcap) - 1857 __offsetof(struct ieee80211_ie_htcap, hc_mcsset); 1858 return frm; 1859 #undef ADDSHORT 1860 } 1861 1862 /* 1863 * Add 802.11n HT capabilities information element 1864 */ 1865 uint8_t * 1866 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni) 1867 { 1868 frm[0] = IEEE80211_ELEMID_HTCAP; 1869 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2; 1870 return ieee80211_add_htcap_body(frm + 2, ni); 1871 } 1872 1873 /* 1874 * Add Broadcom OUI wrapped standard HTCAP ie; this is 1875 * used for compatibility w/ pre-draft implementations. 1876 */ 1877 uint8_t * 1878 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni) 1879 { 1880 frm[0] = IEEE80211_ELEMID_VENDOR; 1881 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2; 1882 frm[2] = (BCM_OUI >> 0) & 0xff; 1883 frm[3] = (BCM_OUI >> 8) & 0xff; 1884 frm[4] = (BCM_OUI >> 16) & 0xff; 1885 frm[5] = BCM_OUI_HTCAP; 1886 return ieee80211_add_htcap_body(frm + 6, ni); 1887 } 1888 1889 /* 1890 * Construct the MCS bit mask of basic rates 1891 * for inclusion in an HT information element. 1892 */ 1893 static void 1894 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs) 1895 { 1896 int i; 1897 1898 for (i = 0; i < rs->rs_nrates; i++) { 1899 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL; 1900 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) && 1901 r < IEEE80211_HTRATE_MAXSIZE) { 1902 /* NB: this assumes a particular implementation */ 1903 setbit(frm, r); 1904 } 1905 } 1906 } 1907 1908 /* 1909 * Update the HTINFO ie for a beacon frame. 1910 */ 1911 void 1912 ieee80211_ht_update_beacon(struct ieee80211com *ic, 1913 struct ieee80211_beacon_offsets *bo) 1914 { 1915 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT) 1916 struct ieee80211_ie_htinfo *ht = 1917 (struct ieee80211_ie_htinfo *) bo->bo_htinfo; 1918 1919 /* XXX only update on channel change */ 1920 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, ic->ic_bsschan); 1921 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH; 1922 if (IEEE80211_IS_CHAN_HT40U(ic->ic_bsschan)) 1923 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 1924 else if (IEEE80211_IS_CHAN_HT40D(ic->ic_bsschan)) 1925 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW; 1926 else 1927 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE; 1928 if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan)) 1929 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040; 1930 1931 /* protection mode */ 1932 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode; 1933 1934 /* XXX propagate to vendor ie's */ 1935 #undef PROTMODE 1936 } 1937 1938 /* 1939 * Add body of an HTINFO information element. 1940 * 1941 * NB: We don't use struct ieee80211_ie_htinfo because we can 1942 * be called to fillin both a standard ie and a compat ie that 1943 * has a vendor OUI at the front. 1944 */ 1945 static uint8_t * 1946 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni) 1947 { 1948 struct ieee80211com *ic = ni->ni_ic; 1949 1950 /* pre-zero remainder of ie */ 1951 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2); 1952 1953 /* primary/control channel center */ 1954 *frm++ = ieee80211_chan2ieee(ic, ic->ic_bsschan); 1955 1956 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH; 1957 if (IEEE80211_IS_CHAN_HT40U(ic->ic_bsschan)) 1958 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE; 1959 else if (IEEE80211_IS_CHAN_HT40D(ic->ic_bsschan)) 1960 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW; 1961 else 1962 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE; 1963 if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan)) 1964 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040; 1965 1966 frm[1] = ic->ic_curhtprotmode; 1967 1968 frm += 5; 1969 1970 /* basic MCS set */ 1971 ieee80211_set_basic_htrates(frm, &ni->ni_htrates); 1972 frm += sizeof(struct ieee80211_ie_htinfo) - 1973 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset); 1974 return frm; 1975 } 1976 1977 /* 1978 * Add 802.11n HT information information element. 1979 */ 1980 uint8_t * 1981 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni) 1982 { 1983 frm[0] = IEEE80211_ELEMID_HTINFO; 1984 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2; 1985 return ieee80211_add_htinfo_body(frm + 2, ni); 1986 } 1987 1988 /* 1989 * Add Broadcom OUI wrapped standard HTINFO ie; this is 1990 * used for compatibility w/ pre-draft implementations. 1991 */ 1992 uint8_t * 1993 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni) 1994 { 1995 frm[0] = IEEE80211_ELEMID_VENDOR; 1996 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2; 1997 frm[2] = (BCM_OUI >> 0) & 0xff; 1998 frm[3] = (BCM_OUI >> 8) & 0xff; 1999 frm[4] = (BCM_OUI >> 16) & 0xff; 2000 frm[5] = BCM_OUI_HTINFO; 2001 return ieee80211_add_htinfo_body(frm + 6, ni); 2002 } 2003