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 }
Cache object: 303232741c73128158e1a6d82c57f5cf
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