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