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Remove empty DragonFly CVS IDs.
[dragonfly.git] / sys / netproto / 802_11 / wlan / ieee80211_ht.c
blob94adf669546b3706c041514ded54a6fd70e98b40
1 /*-
2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: head/sys/net80211/ieee80211_ht.c 195377 2009-07-05 17:59:19Z sam $
26 */
27
28 /*
29 * IEEE 802.11n protocol support.
30 */
31
32 #include "opt_inet.h"
33 #include "opt_wlan.h"
34
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/systm.h>
38 #include <sys/endian.h>
39
40 #include <sys/socket.h>
41
42 #include <net/if.h>
43 #include <net/if_media.h>
44 #include <net/ethernet.h>
45 #include <net/route.h>
46
47 #include <netproto/802_11/ieee80211_var.h>
48 #include <netproto/802_11/ieee80211_action.h>
49 #include <netproto/802_11/ieee80211_input.h>
50
51 /* define here, used throughout file */
52 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
53 #define SM(_v, _f) (((_v) << _f##_S) & _f)
54
55 const struct ieee80211_mcs_rates ieee80211_htrates[16] = {
56 { 13, 14, 27, 30 }, /* MCS 0 */
57 { 26, 29, 54, 60 }, /* MCS 1 */
58 { 39, 43, 81, 90 }, /* MCS 2 */
59 { 52, 58, 108, 120 }, /* MCS 3 */
60 { 78, 87, 162, 180 }, /* MCS 4 */
61 { 104, 116, 216, 240 }, /* MCS 5 */
62 { 117, 130, 243, 270 }, /* MCS 6 */
63 { 130, 144, 270, 300 }, /* MCS 7 */
64 { 26, 29, 54, 60 }, /* MCS 8 */
65 { 52, 58, 108, 120 }, /* MCS 9 */
66 { 78, 87, 162, 180 }, /* MCS 10 */
67 { 104, 116, 216, 240 }, /* MCS 11 */
68 { 156, 173, 324, 360 }, /* MCS 12 */
69 { 208, 231, 432, 480 }, /* MCS 13 */
70 { 234, 260, 486, 540 }, /* MCS 14 */
71 { 260, 289, 540, 600 } /* MCS 15 */
72 };
73
74 static const struct ieee80211_htrateset ieee80211_rateset_11n =
75 { 16, {
76 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
77 10, 11, 12, 13, 14, 15 }
78 };
79
80 #ifdef IEEE80211_AMPDU_AGE
81 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
82 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
83 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
84 "AMPDU max reorder age (ms)");
85 #endif
86
87 static int ieee80211_recv_bar_ena = 1;
88 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
89 0, "BAR frame processing (ena/dis)");
90
91 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
92 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
93 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
94 "ADDBA request timeout (ms)");
95 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
96 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
97 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
98 "ADDBA request backoff (ms)");
99 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
100 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW,
101 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
102
103 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
104 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
105
106 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
107 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
108 static ieee80211_recv_action_func ht_recv_action_ba_delba;
109 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
110 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
111
112 static ieee80211_send_action_func ht_send_action_ba_addba;
113 static ieee80211_send_action_func ht_send_action_ba_delba;
114 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
115
116 static void
117 ieee80211_ht_init(void)
118 {
119 /*
120 * Setup HT parameters that depends on the clock frequency.
121 */
122 #ifdef IEEE80211_AMPDU_AGE
123 ieee80211_ampdu_age = msecs_to_ticks(500);
124 #endif
125 ieee80211_addba_timeout = msecs_to_ticks(250);
126 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
127 ieee80211_bar_timeout = msecs_to_ticks(250);
128 /*
129 * Register action frame handlers.
130 */
131 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
132 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
133 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
134 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
135 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
136 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
137 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
138 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
139 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
140 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
141
142 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
143 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
144 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
145 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
146 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
147 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
148 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
149 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
150 }
151 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
152
153 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
154 struct ieee80211_tx_ampdu *tap);
155 static int ieee80211_addba_request(struct ieee80211_node *ni,
156 struct ieee80211_tx_ampdu *tap,
157 int dialogtoken, int baparamset, int batimeout);
158 static int ieee80211_addba_response(struct ieee80211_node *ni,
159 struct ieee80211_tx_ampdu *tap,
160 int code, int baparamset, int batimeout);
161 static void ieee80211_addba_stop(struct ieee80211_node *ni,
162 struct ieee80211_tx_ampdu *tap);
163 static void ieee80211_bar_response(struct ieee80211_node *ni,
164 struct ieee80211_tx_ampdu *tap, int status);
165 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
166 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
167 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
168 int baparamset, int batimeout, int baseqctl);
169 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
170
171 void
172 ieee80211_ht_attach(struct ieee80211com *ic)
173 {
174 /* setup default aggregation policy */
175 ic->ic_recv_action = ieee80211_recv_action;
176 ic->ic_send_action = ieee80211_send_action;
177 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
178 ic->ic_addba_request = ieee80211_addba_request;
179 ic->ic_addba_response = ieee80211_addba_response;
180 ic->ic_addba_stop = ieee80211_addba_stop;
181 ic->ic_bar_response = ieee80211_bar_response;
182 ic->ic_ampdu_rx_start = ampdu_rx_start;
183 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
184
185 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
186 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
187 }
188
189 void
190 ieee80211_ht_detach(struct ieee80211com *ic)
191 {
192 }
193
194 void
195 ieee80211_ht_vattach(struct ieee80211vap *vap)
196 {
197
198 /* driver can override defaults */
199 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
200 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
201 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
202 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
203 /* tx aggregation traffic thresholds */
204 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
205 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
206 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
207 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
208
209 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
210 /*
211 * Device is HT capable; enable all HT-related
212 * facilities by default.
213 * XXX these choices may be too aggressive.
214 */
215 vap->iv_flags_ht |= IEEE80211_FHT_HT
216 | IEEE80211_FHT_HTCOMPAT
217 ;
218 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
219 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
220 /* XXX infer from channel list? */
221 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
222 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
223 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
224 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
225 }
226 /* enable RIFS if capable */
227 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
228 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
229
230 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
231 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
232 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
233 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
234 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
235 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
236 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
237 }
238 /* NB: disable default legacy WDS, too many issues right now */
239 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
240 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
241 }
242
243 void
244 ieee80211_ht_vdetach(struct ieee80211vap *vap)
245 {
246 }
247
248 static void
249 ht_announce(struct ieee80211com *ic, int mode,
250 const struct ieee80211_htrateset *rs)
251 {
252 struct ifnet *ifp = ic->ic_ifp;
253 int i, rate, mword;
254
255 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]);
256 for (i = 0; i < rs->rs_nrates; i++) {
257 mword = ieee80211_rate2media(ic,
258 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode);
259 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
260 continue;
261 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns;
262 kprintf("%s%d%sMbps", (i != 0 ? " " : ""),
263 rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
264 }
265 kprintf("\n");
266 }
267
268 void
269 ieee80211_ht_announce(struct ieee80211com *ic)
270 {
271 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
272 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n);
273 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
274 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n);
275 }
276
277 const struct ieee80211_htrateset *
278 ieee80211_get_suphtrates(struct ieee80211com *ic,
279 const struct ieee80211_channel *c)
280 {
281 return &ieee80211_rateset_11n;
282 }
283
284 /*
285 * Receive processing.
286 */
287
288 /*
289 * Decap the encapsulated A-MSDU frames and dispatch all but
290 * the last for delivery. The last frame is returned for
291 * delivery via the normal path.
292 */
293 struct mbuf *
294 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
295 {
296 struct ieee80211vap *vap = ni->ni_vap;
297 int framelen;
298 struct mbuf *n;
299
300 /* discard 802.3 header inserted by ieee80211_decap */
301 m_adj(m, sizeof(struct ether_header));
302
303 vap->iv_stats.is_amsdu_decap++;
304
305 for (;;) {
306 /*
307 * Decap the first frame, bust it apart from the
308 * remainder and deliver. We leave the last frame
309 * delivery to the caller (for consistency with other
310 * code paths, could also do it here).
311 */
312 m = ieee80211_decap1(m, &framelen);
313 if (m == NULL) {
314 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
315 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
316 vap->iv_stats.is_amsdu_tooshort++;
317 return NULL;
318 }
319 if (m->m_pkthdr.len == framelen)
320 break;
321 n = m_split(m, framelen, MB_DONTWAIT);
322 if (n == NULL) {
323 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
324 ni->ni_macaddr, "a-msdu",
325 "%s", "unable to split encapsulated frames");
326 vap->iv_stats.is_amsdu_split++;
327 m_freem(m); /* NB: must reclaim */
328 return NULL;
329 }
330 vap->iv_deliver_data(vap, ni, m);
331
332 /*
333 * Remove frame contents; each intermediate frame
334 * is required to be aligned to a 4-byte boundary.
335 */
336 m = n;
337 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
338 }
339 return m; /* last delivered by caller */
340 }
341
342 /*
343 * Purge all frames in the A-MPDU re-order queue.
344 */
345 static void
346 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
347 {
348 struct mbuf *m;
349 int i;
350
351 for (i = 0; i < rap->rxa_wnd; i++) {
352 m = rap->rxa_m[i];
353 if (m != NULL) {
354 rap->rxa_m[i] = NULL;
355 rap->rxa_qbytes -= m->m_pkthdr.len;
356 m_freem(m);
357 if (--rap->rxa_qframes == 0)
358 break;
359 }
360 }
361 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
362 ("lost %u data, %u frames on ampdu rx q",
363 rap->rxa_qbytes, rap->rxa_qframes));
364 }
365
366 /*
367 * Start A-MPDU rx/re-order processing for the specified TID.
368 */
369 static int
370 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
371 int baparamset, int batimeout, int baseqctl)
372 {
373 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
374
375 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
376 /*
377 * AMPDU previously setup and not terminated with a DELBA,
378 * flush the reorder q's in case anything remains.
379 */
380 ampdu_rx_purge(rap);
381 }
382 memset(rap, 0, sizeof(*rap));
383 rap->rxa_wnd = (bufsiz == 0) ?
384 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
385 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
386 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
387
388 return 0;
389 }
390
391 /*
392 * Stop A-MPDU rx processing for the specified TID.
393 */
394 static void
395 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
396 {
397 ampdu_rx_purge(rap);
398 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
399 }
400
401 /*
402 * Dispatch a frame from the A-MPDU reorder queue. The
403 * frame is fed back into ieee80211_input marked with an
404 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
405 * permits ieee80211_input to optimize re-processing).
406 */
407 static __inline void
408 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
409 {
410 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
411 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
412 (void) ieee80211_input(ni, m, 0, 0);
413 }
414
415 /*
416 * Dispatch as many frames as possible from the re-order queue.
417 * Frames will always be "at the front"; we process all frames
418 * up to the first empty slot in the window. On completion we
419 * cleanup state if there are still pending frames in the current
420 * BA window. We assume the frame at slot 0 is already handled
421 * by the caller; we always start at slot 1.
422 */
423 static void
424 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
425 {
426 struct ieee80211vap *vap = ni->ni_vap;
427 struct mbuf *m;
428 int i;
429
430 /* flush run of frames */
431 for (i = 1; i < rap->rxa_wnd; i++) {
432 m = rap->rxa_m[i];
433 if (m == NULL)
434 break;
435 rap->rxa_m[i] = NULL;
436 rap->rxa_qbytes -= m->m_pkthdr.len;
437 rap->rxa_qframes--;
438
439 ampdu_dispatch(ni, m);
440 }
441 /*
442 * If frames remain, copy the mbuf pointers down so
443 * they correspond to the offsets in the new window.
444 */
445 if (rap->rxa_qframes != 0) {
446 int n = rap->rxa_qframes, j;
447 for (j = i+1; j < rap->rxa_wnd; j++) {
448 if (rap->rxa_m[j] != NULL) {
449 rap->rxa_m[j-i] = rap->rxa_m[j];
450 rap->rxa_m[j] = NULL;
451 if (--n == 0)
452 break;
453 }
454 }
455 KASSERT(n == 0, ("lost %d frames", n));
456 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
457 }
458 /*
459 * Adjust the start of the BA window to
460 * reflect the frames just dispatched.
461 */
462 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
463 vap->iv_stats.is_ampdu_rx_oor += i;
464 }
465
466 #ifdef IEEE80211_AMPDU_AGE
467 /*
468 * Dispatch all frames in the A-MPDU re-order queue.
469 */
470 static void
471 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
472 {
473 struct ieee80211vap *vap = ni->ni_vap;
474 struct mbuf *m;
475 int i;
476
477 for (i = 0; i < rap->rxa_wnd; i++) {
478 m = rap->rxa_m[i];
479 if (m == NULL)
480 continue;
481 rap->rxa_m[i] = NULL;
482 rap->rxa_qbytes -= m->m_pkthdr.len;
483 rap->rxa_qframes--;
484 vap->iv_stats.is_ampdu_rx_oor++;
485
486 ampdu_dispatch(ni, m);
487 if (rap->rxa_qframes == 0)
488 break;
489 }
490 }
491 #endif /* IEEE80211_AMPDU_AGE */
492
493 /*
494 * Dispatch all frames in the A-MPDU re-order queue
495 * preceding the specified sequence number. This logic
496 * handles window moves due to a received MSDU or BAR.
497 */
498 static void
499 ampdu_rx_flush_upto(struct ieee80211_node *ni,
500 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
501 {
502 struct ieee80211vap *vap = ni->ni_vap;
503 struct mbuf *m;
504 ieee80211_seq seqno;
505 int i;
506
507 /*
508 * Flush any complete MSDU's with a sequence number lower
509 * than winstart. Gaps may exist. Note that we may actually
510 * dispatch frames past winstart if a run continues; this is
511 * an optimization that avoids having to do a separate pass
512 * to dispatch frames after moving the BA window start.
513 */
514 seqno = rap->rxa_start;
515 for (i = 0; i < rap->rxa_wnd; i++) {
516 m = rap->rxa_m[i];
517 if (m != NULL) {
518 rap->rxa_m[i] = NULL;
519 rap->rxa_qbytes -= m->m_pkthdr.len;
520 rap->rxa_qframes--;
521 vap->iv_stats.is_ampdu_rx_oor++;
522
523 ampdu_dispatch(ni, m);
524 } else {
525 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
526 break;
527 }
528 seqno = IEEE80211_SEQ_INC(seqno);
529 }
530 /*
531 * If frames remain, copy the mbuf pointers down so
532 * they correspond to the offsets in the new window.
533 */
534 if (rap->rxa_qframes != 0) {
535 int n = rap->rxa_qframes, j;
536
537 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
538 KASSERT(rap->rxa_m[0] == NULL,
539 ("%s: BA window slot 0 occupied", __func__));
540 for (j = i+1; j < rap->rxa_wnd; j++) {
541 if (rap->rxa_m[j] != NULL) {
542 rap->rxa_m[j-i] = rap->rxa_m[j];
543 rap->rxa_m[j] = NULL;
544 if (--n == 0)
545 break;
546 }
547 }
548 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
549 "BA win <%d:%d> winstart %d",
550 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
551 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
552 winstart));
553 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
554 }
555 /*
556 * Move the start of the BA window; we use the
557 * sequence number of the last MSDU that was
558 * passed up the stack+1 or winstart if stopped on
559 * a gap in the reorder buffer.
560 */
561 rap->rxa_start = seqno;
562 }
563
564 /*
565 * Process a received QoS data frame for an HT station. Handle
566 * A-MPDU reordering: if this frame is received out of order
567 * and falls within the BA window hold onto it. Otherwise if
568 * this frame completes a run, flush any pending frames. We
569 * return 1 if the frame is consumed. A 0 is returned if
570 * the frame should be processed normally by the caller.
571 */
572 int
573 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
574 {
575 #define IEEE80211_FC0_QOSDATA \
576 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
577 #define PROCESS 0 /* caller should process frame */
578 #define CONSUMED 1 /* frame consumed, caller does nothing */
579 struct ieee80211vap *vap = ni->ni_vap;
580 struct ieee80211_qosframe *wh;
581 struct ieee80211_rx_ampdu *rap;
582 ieee80211_seq rxseq;
583 uint8_t tid;
584 int off;
585
586 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
587 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
588 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
589
590 /* NB: m_len known to be sufficient */
591 wh = mtod(m, struct ieee80211_qosframe *);
592 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
593 /*
594 * Not QoS data, shouldn't get here but just
595 * return it to the caller for processing.
596 */
597 return PROCESS;
598 }
599 if (IEEE80211_IS_DSTODS(wh))
600 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
601 else
602 tid = wh->i_qos[0];
603 tid &= IEEE80211_QOS_TID;
604 rap = &ni->ni_rx_ampdu[tid];
605 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
606 /*
607 * No ADDBA request yet, don't touch.
608 */
609 return PROCESS;
610 }
611 rxseq = le16toh(*(uint16_t *)wh->i_seq);
612 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
613 /*
614 * Fragments are not allowed; toss.
615 */
616 IEEE80211_DISCARD_MAC(vap,
617 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
618 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
619 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
620 vap->iv_stats.is_ampdu_rx_drop++;
621 IEEE80211_NODE_STAT(ni, rx_drop);
622 m_freem(m);
623 return CONSUMED;
624 }
625 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
626 rap->rxa_nframes++;
627 again:
628 if (rxseq == rap->rxa_start) {
629 /*
630 * First frame in window.
631 */
632 if (rap->rxa_qframes != 0) {
633 /*
634 * Dispatch as many packets as we can.
635 */
636 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
637 ampdu_dispatch(ni, m);
638 ampdu_rx_dispatch(rap, ni);
639 return CONSUMED;
640 } else {
641 /*
642 * In order; advance window and notify
643 * caller to dispatch directly.
644 */
645 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
646 return PROCESS;
647 }
648 }
649 /*
650 * Frame is out of order; store if in the BA window.
651 */
652 /* calculate offset in BA window */
653 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
654 if (off < rap->rxa_wnd) {
655 /*
656 * Common case (hopefully): in the BA window.
657 * Sec 9.10.7.6 a) (D2.04 p.118 line 47)
658 */
659 #ifdef IEEE80211_AMPDU_AGE
660 /*
661 * Check for frames sitting too long in the reorder queue.
662 * This should only ever happen if frames are not delivered
663 * without the sender otherwise notifying us (e.g. with a
664 * BAR to move the window). Typically this happens because
665 * of vendor bugs that cause the sequence number to jump.
666 * When this happens we get a gap in the reorder queue that
667 * leaves frame sitting on the queue until they get pushed
668 * out due to window moves. When the vendor does not send
669 * BAR this move only happens due to explicit packet sends
670 *
671 * NB: we only track the time of the oldest frame in the
672 * reorder q; this means that if we flush we might push
673 * frames that still "new"; if this happens then subsequent
674 * frames will result in BA window moves which cost something
675 * but is still better than a big throughput dip.
676 */
677 if (rap->rxa_qframes != 0) {
678 /* XXX honor batimeout? */
679 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
680 /*
681 * Too long since we received the first
682 * frame; flush the reorder buffer.
683 */
684 if (rap->rxa_qframes != 0) {
685 vap->iv_stats.is_ampdu_rx_age +=
686 rap->rxa_qframes;
687 ampdu_rx_flush(ni, rap);
688 }
689 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
690 return PROCESS;
691 }
692 } else {
693 /*
694 * First frame, start aging timer.
695 */
696 rap->rxa_age = ticks;
697 }
698 #endif /* IEEE80211_AMPDU_AGE */
699 /* save packet */
700 if (rap->rxa_m[off] == NULL) {
701 rap->rxa_m[off] = m;
702 rap->rxa_qframes++;
703 rap->rxa_qbytes += m->m_pkthdr.len;
704 vap->iv_stats.is_ampdu_rx_reorder++;
705 } else {
706 IEEE80211_DISCARD_MAC(vap,
707 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
708 ni->ni_macaddr, "a-mpdu duplicate",
709 "seqno %u tid %u BA win <%u:%u>",
710 rxseq, tid, rap->rxa_start,
711 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
712 vap->iv_stats.is_rx_dup++;
713 IEEE80211_NODE_STAT(ni, rx_dup);
714 m_freem(m);
715 }
716 return CONSUMED;
717 }
718 if (off < IEEE80211_SEQ_BA_RANGE) {
719 /*
720 * Outside the BA window, but within range;
721 * flush the reorder q and move the window.
722 * Sec 9.10.7.6 b) (D2.04 p.118 line 60)
723 */
724 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
725 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
726 rap->rxa_start,
727 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
728 rap->rxa_qframes, rxseq, tid);
729 vap->iv_stats.is_ampdu_rx_move++;
730
731 /*
732 * The spec says to flush frames up to but not including:
733 * WinStart_B = rxseq - rap->rxa_wnd + 1
734 * Then insert the frame or notify the caller to process
735 * it immediately. We can safely do this by just starting
736 * over again because we know the frame will now be within
737 * the BA window.
738 */
739 /* NB: rxa_wnd known to be >0 */
740 ampdu_rx_flush_upto(ni, rap,
741 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
742 goto again;
743 } else {
744 /*
745 * Outside the BA window and out of range; toss.
746 * Sec 9.10.7.6 c) (D2.04 p.119 line 16)
747 */
748 IEEE80211_DISCARD_MAC(vap,
749 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
750 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
751 rap->rxa_start,
752 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
753 rap->rxa_qframes, rxseq, tid,
754 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
755 vap->iv_stats.is_ampdu_rx_drop++;
756 IEEE80211_NODE_STAT(ni, rx_drop);
757 m_freem(m);
758 return CONSUMED;
759 }
760 #undef CONSUMED
761 #undef PROCESS
762 #undef IEEE80211_FC0_QOSDATA
763 }
764
765 /*
766 * Process a BAR ctl frame. Dispatch all frames up to
767 * the sequence number of the frame. If this frame is
768 * out of range it's discarded.
769 */
770 void
771 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
772 {
773 struct ieee80211vap *vap = ni->ni_vap;
774 struct ieee80211_frame_bar *wh;
775 struct ieee80211_rx_ampdu *rap;
776 ieee80211_seq rxseq;
777 int tid, off;
778
779 if (!ieee80211_recv_bar_ena) {
780 #if 0
781 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
782 ni->ni_macaddr, "BAR", "%s", "processing disabled");
783 #endif
784 vap->iv_stats.is_ampdu_bar_bad++;
785 return;
786 }
787 wh = mtod(m0, struct ieee80211_frame_bar *);
788 /* XXX check basic BAR */
789 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
790 rap = &ni->ni_rx_ampdu[tid];
791 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
792 /*
793 * No ADDBA request yet, don't touch.
794 */
795 IEEE80211_DISCARD_MAC(vap,
796 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
797 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
798 vap->iv_stats.is_ampdu_bar_bad++;
799 return;
800 }
801 vap->iv_stats.is_ampdu_bar_rx++;
802 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
803 if (rxseq == rap->rxa_start)
804 return;
805 /* calculate offset in BA window */
806 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
807 if (off < IEEE80211_SEQ_BA_RANGE) {
808 /*
809 * Flush the reorder q up to rxseq and move the window.
810 * Sec 9.10.7.6 a) (D2.04 p.119 line 22)
811 */
812 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
813 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
814 rap->rxa_start,
815 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
816 rap->rxa_qframes, rxseq, tid);
817 vap->iv_stats.is_ampdu_bar_move++;
818
819 ampdu_rx_flush_upto(ni, rap, rxseq);
820 if (off >= rap->rxa_wnd) {
821 /*
822 * BAR specifies a window start to the right of BA
823 * window; we must move it explicitly since
824 * ampdu_rx_flush_upto will not.
825 */
826 rap->rxa_start = rxseq;
827 }
828 } else {
829 /*
830 * Out of range; toss.
831 * Sec 9.10.7.6 b) (D2.04 p.119 line 41)
832 */
833 IEEE80211_DISCARD_MAC(vap,
834 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
835 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
836 rap->rxa_start,
837 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
838 rap->rxa_qframes, rxseq, tid,
839 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
840 vap->iv_stats.is_ampdu_bar_oow++;
841 IEEE80211_NODE_STAT(ni, rx_drop);
842 }
843 }
844
845 /*
846 * Setup HT-specific state in a node. Called only
847 * when HT use is negotiated so we don't do extra
848 * work for temporary and/or legacy sta's.
849 */
850 void
851 ieee80211_ht_node_init(struct ieee80211_node *ni)
852 {
853 struct ieee80211_tx_ampdu *tap;
854 int ac;
855
856 if (ni->ni_flags & IEEE80211_NODE_HT) {
857 /*
858 * Clean AMPDU state on re-associate. This handles the case
859 * where a station leaves w/o notifying us and then returns
860 * before node is reaped for inactivity.
861 */
862 ieee80211_ht_node_cleanup(ni);
863 }
864 for (ac = 0; ac < WME_NUM_AC; ac++) {
865 tap = &ni->ni_tx_ampdu[ac];
866 tap->txa_ac = ac;
867 tap->txa_ni = ni;
868 /* NB: further initialization deferred */
869 }
870 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
871 }
872
873 /*
874 * Cleanup HT-specific state in a node. Called only
875 * when HT use has been marked.
876 */
877 void
878 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
879 {
880 struct ieee80211com *ic = ni->ni_ic;
881 int i;
882
883 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
884
885 /* XXX optimize this */
886 for (i = 0; i < WME_NUM_AC; i++) {
887 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
888 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
889 ampdu_tx_stop(tap);
890 }
891 for (i = 0; i < WME_NUM_TID; i++)
892 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
893
894 ni->ni_htcap = 0;
895 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
896 }
897
898 /*
899 * Age out HT resources for a station.
900 */
901 void
902 ieee80211_ht_node_age(struct ieee80211_node *ni)
903 {
904 #ifdef IEEE80211_AMPDU_AGE
905 struct ieee80211vap *vap = ni->ni_vap;
906 uint8_t tid;
907 #endif
908
909 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
910
911 #ifdef IEEE80211_AMPDU_AGE
912 for (tid = 0; tid < WME_NUM_TID; tid++) {
913 struct ieee80211_rx_ampdu *rap;
914
915 rap = &ni->ni_rx_ampdu[tid];
916 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
917 continue;
918 if (rap->rxa_qframes == 0)
919 continue;
920 /*
921 * Check for frames sitting too long in the reorder queue.
922 * See above for more details on what's happening here.
923 */
924 /* XXX honor batimeout? */
925 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
926 /*
927 * Too long since we received the first
928 * frame; flush the reorder buffer.
929 */
930 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
931 ampdu_rx_flush(ni, rap);
932 }
933 }
934 #endif /* IEEE80211_AMPDU_AGE */
935 }
936
937 static struct ieee80211_channel *
938 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
939 {
940 return ieee80211_find_channel(ic, c->ic_freq,
941 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
942 }
943
944 /*
945 * Adjust a channel to be HT/non-HT according to the vap's configuration.
946 */
947 struct ieee80211_channel *
948 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
949 struct ieee80211_channel *chan, int flags)
950 {
951 struct ieee80211_channel *c;
952
953 if (flags & IEEE80211_FHT_HT) {
954 /* promote to HT if possible */
955 if (flags & IEEE80211_FHT_USEHT40) {
956 if (!IEEE80211_IS_CHAN_HT40(chan)) {
957 /* NB: arbitrarily pick ht40+ over ht40- */
958 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
959 if (c == NULL)
960 c = findhtchan(ic, chan,
961 IEEE80211_CHAN_HT40D);
962 if (c == NULL)
963 c = findhtchan(ic, chan,
964 IEEE80211_CHAN_HT20);
965 if (c != NULL)
966 chan = c;
967 }
968 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
969 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
970 if (c != NULL)
971 chan = c;
972 }
973 } else if (IEEE80211_IS_CHAN_HT(chan)) {
974 /* demote to legacy, HT use is disabled */
975 c = ieee80211_find_channel(ic, chan->ic_freq,
976 chan->ic_flags &~ IEEE80211_CHAN_HT);
977 if (c != NULL)
978 chan = c;
979 }
980 return chan;
981 }
982
983 /*
984 * Setup HT-specific state for a legacy WDS peer.
985 */
986 void
987 ieee80211_ht_wds_init(struct ieee80211_node *ni)
988 {
989 struct ieee80211vap *vap = ni->ni_vap;
990 struct ieee80211_tx_ampdu *tap;
991 int ac;
992
993 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
994
995 /* XXX check scan cache in case peer has an ap and we have info */
996 /*
997 * If setup with a legacy channel; locate an HT channel.
998 * Otherwise if the inherited channel (from a companion
999 * AP) is suitable use it so we use the same location
1000 * for the extension channel).
1001 */
1002 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1003 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1004
1005 ni->ni_htcap = 0;
1006 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1007 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1008 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1009 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1010 ni->ni_chw = 40;
1011 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1012 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1013 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1014 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1015 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1016 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1017 } else {
1018 ni->ni_chw = 20;
1019 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1020 }
1021 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1022 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1023 ni->ni_flags |= IEEE80211_NODE_RIFS;
1024 /* XXX does it make sense to enable SMPS? */
1025
1026 ni->ni_htopmode = 0; /* XXX need protection state */
1027 ni->ni_htstbc = 0; /* XXX need info */
1028
1029 for (ac = 0; ac < WME_NUM_AC; ac++) {
1030 tap = &ni->ni_tx_ampdu[ac];
1031 tap->txa_ac = ac;
1032 }
1033 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1034 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1035 }
1036
1037 /*
1038 * Notify hostap vaps of a change in the HTINFO ie.
1039 */
1040 static void
1041 htinfo_notify(struct ieee80211com *ic)
1042 {
1043 struct ieee80211vap *vap;
1044 int first = 1;
1045
1046 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1047 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1048 continue;
1049 if (vap->iv_state != IEEE80211_S_RUN ||
1050 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1051 continue;
1052 if (first) {
1053 IEEE80211_NOTE(vap,
1054 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1055 vap->iv_bss,
1056 "HT bss occupancy change: %d sta, %d ht, "
1057 "%d ht40%s, HT protmode now 0x%x"
1058 , ic->ic_sta_assoc
1059 , ic->ic_ht_sta_assoc
1060 , ic->ic_ht40_sta_assoc
1061 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1062 ", non-HT sta present" : ""
1063 , ic->ic_curhtprotmode);
1064 first = 0;
1065 }
1066 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1067 }
1068 }
1069
1070 /*
1071 * Calculate HT protection mode from current
1072 * state and handle updates.
1073 */
1074 static void
1075 htinfo_update(struct ieee80211com *ic)
1076 {
1077 uint8_t protmode;
1078
1079 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1080 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1081 | IEEE80211_HTINFO_NONHT_PRESENT;
1082 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1083 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1084 | IEEE80211_HTINFO_NONHT_PRESENT;
1085 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1086 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1087 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1088 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1089 } else {
1090 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1091 }
1092 if (protmode != ic->ic_curhtprotmode) {
1093 ic->ic_curhtprotmode = protmode;
1094 htinfo_notify(ic);
1095 }
1096 }
1097
1098 /*
1099 * Handle an HT station joining a BSS.
1100 */
1101 void
1102 ieee80211_ht_node_join(struct ieee80211_node *ni)
1103 {
1104 struct ieee80211com *ic = ni->ni_ic;
1105
1106 if (ni->ni_flags & IEEE80211_NODE_HT) {
1107 ic->ic_ht_sta_assoc++;
1108 if (ni->ni_chw == 40)
1109 ic->ic_ht40_sta_assoc++;
1110 }
1111 htinfo_update(ic);
1112 }
1113
1114 /*
1115 * Handle an HT station leaving a BSS.
1116 */
1117 void
1118 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1119 {
1120 struct ieee80211com *ic = ni->ni_ic;
1121
1122 if (ni->ni_flags & IEEE80211_NODE_HT) {
1123 ic->ic_ht_sta_assoc--;
1124 if (ni->ni_chw == 40)
1125 ic->ic_ht40_sta_assoc--;
1126 }
1127 htinfo_update(ic);
1128 }
1129
1130 /*
1131 * Public version of htinfo_update; used for processing
1132 * beacon frames from overlapping bss.
1133 *
1134 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1135 * (on receipt of a beacon that advertises MIXED) or
1136 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1137 * from an overlapping legacy bss). We treat MIXED with
1138 * a higher precedence than PROTOPT (i.e. we will not change
1139 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1140 * corresponds to how we handle things in htinfo_update.
1141 */
1142 void
1143 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1144 {
1145 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1146 /* track non-HT station presence */
1147 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1148 ("protmode 0x%x", protmode));
1149 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1150 ic->ic_lastnonht = ticks;
1151
1152 if (protmode != ic->ic_curhtprotmode &&
1153 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1154 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1155 /* push beacon update */
1156 ic->ic_curhtprotmode = protmode;
1157 htinfo_notify(ic);
1158 }
1159 #undef OPMODE
1160 }
1161
1162 /*
1163 * Time out presence of an overlapping bss with non-HT
1164 * stations. When operating in hostap mode we listen for
1165 * beacons from other stations and if we identify a non-HT
1166 * station is present we update the opmode field of the
1167 * HTINFO ie. To identify when all non-HT stations are
1168 * gone we time out this condition.
1169 */
1170 void
1171 ieee80211_ht_timeout(struct ieee80211com *ic)
1172 {
1173 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1174 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1175 #if 0
1176 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1177 "%s", "time out non-HT STA present on channel");
1178 #endif
1179 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1180 htinfo_update(ic);
1181 }
1182 }
1183
1184 /* unalligned little endian access */
1185 #define LE_READ_2(p) \
1186 ((uint16_t) \
1187 ((((const uint8_t *)(p))[0] ) | \
1188 (((const uint8_t *)(p))[1] << 8)))
1189
1190 /*
1191 * Process an 802.11n HT capabilities ie.
1192 */
1193 void
1194 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1195 {
1196 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1197 /*
1198 * Station used Vendor OUI ie to associate;
1199 * mark the node so when we respond we'll use
1200 * the Vendor OUI's and not the standard ie's.
1201 */
1202 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1203 ie += 4;
1204 } else
1205 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1206
1207 ni->ni_htcap = LE_READ_2(ie +
1208 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1209 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1210 }
1211
1212 static void
1213 htinfo_parse(struct ieee80211_node *ni,
1214 const struct ieee80211_ie_htinfo *htinfo)
1215 {
1216 uint16_t w;
1217
1218 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1219 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1220 w = LE_READ_2(&htinfo->hi_byte2);
1221 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1222 w = LE_READ_2(&htinfo->hi_byte45);
1223 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1224 }
1225
1226 /*
1227 * Parse an 802.11n HT info ie and save useful information
1228 * to the node state. Note this does not effect any state
1229 * changes such as for channel width change.
1230 */
1231 void
1232 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1233 {
1234 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1235 ie += 4;
1236 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1237 }
1238
1239 /*
1240 * Handle 11n channel switch. Use the received HT ie's to
1241 * identify the right channel to use. If we cannot locate it
1242 * in the channel table then fallback to legacy operation.
1243 * Note that we use this information to identify the node's
1244 * channel only; the caller is responsible for insuring any
1245 * required channel change is done (e.g. in sta mode when
1246 * parsing the contents of a beacon frame).
1247 */
1248 static void
1249 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1250 {
1251 struct ieee80211com *ic = ni->ni_ic;
1252 struct ieee80211_channel *c;
1253 int chanflags;
1254
1255 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1256 if (chanflags != ni->ni_chan->ic_flags) {
1257 /* XXX not right for ht40- */
1258 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1259 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1260 /*
1261 * No HT40 channel entry in our table; fall back
1262 * to HT20 operation. This should not happen.
1263 */
1264 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1265 #if 0
1266 IEEE80211_NOTE(ni->ni_vap,
1267 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1268 "no HT40 channel (freq %u), falling back to HT20",
1269 ni->ni_chan->ic_freq);
1270 #endif
1271 /* XXX stat */
1272 }
1273 if (c != NULL && c != ni->ni_chan) {
1274 IEEE80211_NOTE(ni->ni_vap,
1275 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1276 "switch station to HT%d channel %u/0x%x",
1277 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1278 c->ic_freq, c->ic_flags);
1279 ni->ni_chan = c;
1280 }
1281 /* NB: caller responsible for forcing any channel change */
1282 }
1283 /* update node's tx channel width */
1284 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1285 }
1286
1287 /*
1288 * Update 11n MIMO PS state according to received htcap.
1289 */
1290 static __inline int
1291 htcap_update_mimo_ps(struct ieee80211_node *ni)
1292 {
1293 uint16_t oflags = ni->ni_flags;
1294
1295 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1296 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1297 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1298 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1299 break;
1300 case IEEE80211_HTCAP_SMPS_ENA:
1301 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1302 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1303 break;
1304 case IEEE80211_HTCAP_SMPS_OFF:
1305 default: /* disable on rx of reserved value */
1306 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1307 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1308 break;
1309 }
1310 return (oflags ^ ni->ni_flags);
1311 }
1312
1313 /*
1314 * Update short GI state according to received htcap
1315 * and local settings.
1316 */
1317 static __inline void
1318 htcap_update_shortgi(struct ieee80211_node *ni)
1319 {
1320 struct ieee80211vap *vap = ni->ni_vap;
1321
1322 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1323 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1324 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1325 ni->ni_flags |= IEEE80211_NODE_SGI20;
1326 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1327 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1328 ni->ni_flags |= IEEE80211_NODE_SGI40;
1329 }
1330
1331 /*
1332 * Parse and update HT-related state extracted from
1333 * the HT cap and info ie's.
1334 */
1335 void
1336 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1337 const uint8_t *htcapie, const uint8_t *htinfoie)
1338 {
1339 struct ieee80211vap *vap = ni->ni_vap;
1340 const struct ieee80211_ie_htinfo *htinfo;
1341 int htflags;
1342
1343 ieee80211_parse_htcap(ni, htcapie);
1344 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1345 htcap_update_mimo_ps(ni);
1346 htcap_update_shortgi(ni);
1347
1348 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1349 htinfoie += 4;
1350 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1351 htinfo_parse(ni, htinfo);
1352
1353 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1354 IEEE80211_CHAN_HT20 : 0;
1355 /* NB: honor operating mode constraint */
1356 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1357 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1358 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1359 htflags = IEEE80211_CHAN_HT40U;
1360 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1361 htflags = IEEE80211_CHAN_HT40D;
1362 }
1363 htinfo_update_chw(ni, htflags);
1364
1365 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1366 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1367 ni->ni_flags |= IEEE80211_NODE_RIFS;
1368 else
1369 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1370 }
1371
1372 /*
1373 * Parse and update HT-related state extracted from the HT cap ie
1374 * for a station joining an HT BSS.
1375 */
1376 void
1377 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1378 {
1379 struct ieee80211vap *vap = ni->ni_vap;
1380 int htflags;
1381
1382 ieee80211_parse_htcap(ni, htcapie);
1383 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1384 htcap_update_mimo_ps(ni);
1385 htcap_update_shortgi(ni);
1386
1387 /* NB: honor operating mode constraint */
1388 /* XXX 40 MHZ intolerant */
1389 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1390 IEEE80211_CHAN_HT20 : 0;
1391 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1392 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1393 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1394 htflags = IEEE80211_CHAN_HT40U;
1395 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1396 htflags = IEEE80211_CHAN_HT40D;
1397 }
1398 htinfo_update_chw(ni, htflags);
1399 }
1400
1401 /*
1402 * Install received HT rate set by parsing the HT cap ie.
1403 */
1404 int
1405 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1406 {
1407 struct ieee80211vap *vap = ni->ni_vap;
1408 const struct ieee80211_ie_htcap *htcap;
1409 struct ieee80211_htrateset *rs;
1410 int i;
1411
1412 rs = &ni->ni_htrates;
1413 memset(rs, 0, sizeof(*rs));
1414 if (ie != NULL) {
1415 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1416 ie += 4;
1417 htcap = (const struct ieee80211_ie_htcap *) ie;
1418 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1419 if (isclr(htcap->hc_mcsset, i))
1420 continue;
1421 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1422 IEEE80211_NOTE(vap,
1423 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1424 "WARNING, HT rate set too large; only "
1425 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1426 vap->iv_stats.is_rx_rstoobig++;
1427 break;
1428 }
1429 rs->rs_rates[rs->rs_nrates++] = i;
1430 }
1431 }
1432 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1433 }
1434
1435 /*
1436 * Mark rates in a node's HT rate set as basic according
1437 * to the information in the supplied HT info ie.
1438 */
1439 void
1440 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1441 {
1442 const struct ieee80211_ie_htinfo *htinfo;
1443 struct ieee80211_htrateset *rs;
1444 int i, j;
1445
1446 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1447 ie += 4;
1448 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1449 rs = &ni->ni_htrates;
1450 if (rs->rs_nrates == 0) {
1451 IEEE80211_NOTE(ni->ni_vap,
1452 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1453 "%s", "WARNING, empty HT rate set");
1454 return;
1455 }
1456 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1457 if (isclr(htinfo->hi_basicmcsset, i))
1458 continue;
1459 for (j = 0; j < rs->rs_nrates; j++)
1460 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1461 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1462 }
1463 }
1464
1465 static void
1466 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1467 {
1468 callout_init_mp(&tap->txa_timer);
1469 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1470 }
1471
1472 static void
1473 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1474 {
1475 struct ieee80211_node *ni = tap->txa_ni;
1476 struct ieee80211com *ic = ni->ni_ic;
1477
1478 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1479 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
1480
1481 /*
1482 * Stop BA stream if setup so driver has a chance
1483 * to reclaim any resources it might have allocated.
1484 */
1485 ic->ic_addba_stop(ni, tap);
1486 /*
1487 * Stop any pending BAR transmit.
1488 */
1489 bar_stop_timer(tap);
1490
1491 tap->txa_lastsample = 0;
1492 tap->txa_avgpps = 0;
1493 /* NB: clearing NAK means we may re-send ADDBA */
1494 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1495 }
1496
1497 static void
1498 addba_timeout_callout(void *arg)
1499 {
1500 struct ieee80211_tx_ampdu *tap = arg;
1501
1502 wlan_serialize_enter();
1503 /* XXX ? */
1504 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1505 tap->txa_attempts++;
1506 wlan_serialize_exit();
1507 }
1508
1509 static void
1510 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1511 {
1512 /* XXX use CALLOUT_PENDING instead? */
1513 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1514 addba_timeout_callout, tap);
1515 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1516 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1517 }
1518
1519 static void
1520 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1521 {
1522 /* XXX use CALLOUT_PENDING instead? */
1523 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1524 callout_stop(&tap->txa_timer);
1525 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1526 }
1527 }
1528
1529 /*
1530 * Default method for requesting A-MPDU tx aggregation.
1531 * We setup the specified state block and start a timer
1532 * to wait for an ADDBA response frame.
1533 */
1534 static int
1535 ieee80211_addba_request(struct ieee80211_node *ni,
1536 struct ieee80211_tx_ampdu *tap,
1537 int dialogtoken, int baparamset, int batimeout)
1538 {
1539 int bufsiz;
1540
1541 /* XXX locking */
1542 tap->txa_token = dialogtoken;
1543 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1544 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1545 tap->txa_wnd = (bufsiz == 0) ?
1546 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1547 addba_start_timeout(tap);
1548 return 1;
1549 }
1550
1551 /*
1552 * Default method for processing an A-MPDU tx aggregation
1553 * response. We shutdown any pending timer and update the
1554 * state block according to the reply.
1555 */
1556 static int
1557 ieee80211_addba_response(struct ieee80211_node *ni,
1558 struct ieee80211_tx_ampdu *tap,
1559 int status, int baparamset, int batimeout)
1560 {
1561 int bufsiz, tid;
1562
1563 /* XXX locking */
1564 addba_stop_timeout(tap);
1565 if (status == IEEE80211_STATUS_SUCCESS) {
1566 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1567 /* XXX override our request? */
1568 tap->txa_wnd = (bufsiz == 0) ?
1569 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1570 /* XXX AC/TID */
1571 tid = MS(baparamset, IEEE80211_BAPS_TID);
1572 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1573 tap->txa_attempts = 0;
1574 } else {
1575 /* mark tid so we don't try again */
1576 tap->txa_flags |= IEEE80211_AGGR_NAK;
1577 }
1578 return 1;
1579 }
1580
1581 /*
1582 * Default method for stopping A-MPDU tx aggregation.
1583 * Any timer is cleared and we drain any pending frames.
1584 */
1585 static void
1586 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1587 {
1588 /* XXX locking */
1589 addba_stop_timeout(tap);
1590 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1591 /* XXX clear aggregation queue */
1592 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1593 }
1594 tap->txa_attempts = 0;
1595 }
1596
1597 /*
1598 * Process a received action frame using the default aggregation
1599 * policy. We intercept ADDBA-related frames and use them to
1600 * update our aggregation state. All other frames are passed up
1601 * for processing by ieee80211_recv_action.
1602 */
1603 static int
1604 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
1605 const struct ieee80211_frame *wh,
1606 const uint8_t *frm, const uint8_t *efrm)
1607 {
1608 struct ieee80211com *ic = ni->ni_ic;
1609 struct ieee80211vap *vap = ni->ni_vap;
1610 struct ieee80211_rx_ampdu *rap;
1611 uint8_t dialogtoken;
1612 uint16_t baparamset, batimeout, baseqctl;
1613 uint16_t args[4];
1614 int tid;
1615
1616 dialogtoken = frm[2];
1617 baparamset = LE_READ_2(frm+3);
1618 batimeout = LE_READ_2(frm+5);
1619 baseqctl = LE_READ_2(frm+7);
1620
1621 tid = MS(baparamset, IEEE80211_BAPS_TID);
1622
1623 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1624 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
1625 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
1626 dialogtoken, baparamset,
1627 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1628 batimeout,
1629 MS(baseqctl, IEEE80211_BASEQ_START),
1630 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1631
1632 rap = &ni->ni_rx_ampdu[tid];
1633
1634 /* Send ADDBA response */
1635 args[0] = dialogtoken;
1636 /*
1637 * NB: We ack only if the sta associated with HT and
1638 * the ap is configured to do AMPDU rx (the latter
1639 * violates the 11n spec and is mostly for testing).
1640 */
1641 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1642 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1643 /* XXX handle ampdu_rx_start failure */
1644 ic->ic_ampdu_rx_start(ni, rap,
1645 baparamset, batimeout, baseqctl);
1646
1647 args[1] = IEEE80211_STATUS_SUCCESS;
1648 } else {
1649 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1650 ni, "reject ADDBA request: %s",
1651 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1652 "administratively disabled" :
1653 "not negotiated for station");
1654 vap->iv_stats.is_addba_reject++;
1655 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1656 }
1657 /* XXX honor rap flags? */
1658 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1659 | SM(tid, IEEE80211_BAPS_TID)
1660 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1661 ;
1662 args[3] = 0;
1663 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1664 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1665 return 0;
1666 }
1667
1668 static int
1669 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
1670 const struct ieee80211_frame *wh,
1671 const uint8_t *frm, const uint8_t *efrm)
1672 {
1673 struct ieee80211com *ic = ni->ni_ic;
1674 struct ieee80211vap *vap = ni->ni_vap;
1675 struct ieee80211_tx_ampdu *tap;
1676 uint8_t dialogtoken, policy;
1677 uint16_t baparamset, batimeout, code;
1678 int tid, ac, bufsiz;
1679
1680 dialogtoken = frm[2];
1681 code = LE_READ_2(frm+3);
1682 baparamset = LE_READ_2(frm+5);
1683 tid = MS(baparamset, IEEE80211_BAPS_TID);
1684 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1685 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
1686 batimeout = LE_READ_2(frm+7);
1687
1688 ac = TID_TO_WME_AC(tid);
1689 tap = &ni->ni_tx_ampdu[ac];
1690 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1691 IEEE80211_DISCARD_MAC(vap,
1692 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1693 ni->ni_macaddr, "ADDBA response",
1694 "no pending ADDBA, tid %d dialogtoken %u "
1695 "code %d", tid, dialogtoken, code);
1696 vap->iv_stats.is_addba_norequest++;
1697 return 0;
1698 }
1699 if (dialogtoken != tap->txa_token) {
1700 IEEE80211_DISCARD_MAC(vap,
1701 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1702 ni->ni_macaddr, "ADDBA response",
1703 "dialogtoken mismatch: waiting for %d, "
1704 "received %d, tid %d code %d",
1705 tap->txa_token, dialogtoken, tid, code);
1706 vap->iv_stats.is_addba_badtoken++;
1707 return 0;
1708 }
1709 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
1710 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
1711 IEEE80211_DISCARD_MAC(vap,
1712 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1713 ni->ni_macaddr, "ADDBA response",
1714 "policy mismatch: expecting %d, "
1715 "received %d, tid %d code %d",
1716 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
1717 policy, tid, code);
1718 vap->iv_stats.is_addba_badpolicy++;
1719 return 0;
1720 }
1721 #if 0
1722 /* XXX we take MIN in ieee80211_addba_response */
1723 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
1724 IEEE80211_DISCARD_MAC(vap,
1725 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1726 ni->ni_macaddr, "ADDBA response",
1727 "BA window too large: max %d, "
1728 "received %d, tid %d code %d",
1729 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
1730 vap->iv_stats.is_addba_badbawinsize++;
1731 return 0;
1732 }
1733 #endif
1734 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1735 "recv ADDBA response: dialogtoken %u code %d "
1736 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
1737 dialogtoken, code, baparamset, tid, bufsiz,
1738 batimeout);
1739 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
1740 return 0;
1741 }
1742
1743 static int
1744 ht_recv_action_ba_delba(struct ieee80211_node *ni,
1745 const struct ieee80211_frame *wh,
1746 const uint8_t *frm, const uint8_t *efrm)
1747 {
1748 struct ieee80211com *ic = ni->ni_ic;
1749 struct ieee80211_rx_ampdu *rap;
1750 struct ieee80211_tx_ampdu *tap;
1751 uint16_t baparamset, code;
1752 int tid, ac;
1753
1754 baparamset = LE_READ_2(frm+2);
1755 code = LE_READ_2(frm+4);
1756
1757 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
1758
1759 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1760 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
1761 "code %d", baparamset, tid,
1762 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
1763
1764 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
1765 ac = TID_TO_WME_AC(tid);
1766 tap = &ni->ni_tx_ampdu[ac];
1767 ic->ic_addba_stop(ni, tap);
1768 } else {
1769 rap = &ni->ni_rx_ampdu[tid];
1770 ic->ic_ampdu_rx_stop(ni, rap);
1771 }
1772 return 0;
1773 }
1774
1775 static int
1776 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
1777 const struct ieee80211_frame *wh,
1778 const uint8_t *frm, const uint8_t *efrm)
1779 {
1780 int chw;
1781
1782 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
1783
1784 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1785 "%s: HT txchwidth, width %d%s",
1786 __func__, chw, ni->ni_chw != chw ? "*" : "");
1787 if (chw != ni->ni_chw) {
1788 ni->ni_chw = chw;
1789 /* XXX notify on change */
1790 }
1791 return 0;
1792 }
1793
1794 static int
1795 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
1796 const struct ieee80211_frame *wh,
1797 const uint8_t *frm, const uint8_t *efrm)
1798 {
1799 const struct ieee80211_action_ht_mimopowersave *mps =
1800 (const struct ieee80211_action_ht_mimopowersave *) frm;
1801
1802 /* XXX check iv_htcaps */
1803 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
1804 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1805 else
1806 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1807 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
1808 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1809 else
1810 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1811 /* XXX notify on change */
1812 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1813 "%s: HT MIMO PS (%s%s)", __func__,
1814 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
1815 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
1816 );
1817 return 0;
1818 }
1819
1820 /*
1821 * Transmit processing.
1822 */
1823
1824 /*
1825 * Check if A-MPDU should be requested/enabled for a stream.
1826 * We require a traffic rate above a per-AC threshold and we
1827 * also handle backoff from previous failed attempts.
1828 *
1829 * Drivers may override this method to bring in information
1830 * such as link state conditions in making the decision.
1831 */
1832 static int
1833 ieee80211_ampdu_enable(struct ieee80211_node *ni,
1834 struct ieee80211_tx_ampdu *tap)
1835 {
1836 struct ieee80211vap *vap = ni->ni_vap;
1837
1838 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
1839 return 0;
1840 /* XXX check rssi? */
1841 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
1842 ticks < tap->txa_nextrequest) {
1843 /*
1844 * Don't retry too often; txa_nextrequest is set
1845 * to the minimum interval we'll retry after
1846 * ieee80211_addba_maxtries failed attempts are made.
1847 */
1848 return 0;
1849 }
1850 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1851 "enable AMPDU on %s, avgpps %d pkts %d",
1852 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
1853 return 1;
1854 }
1855
1856 /*
1857 * Request A-MPDU tx aggregation. Setup local state and
1858 * issue an ADDBA request. BA use will only happen after
1859 * the other end replies with ADDBA response.
1860 */
1861 int
1862 ieee80211_ampdu_request(struct ieee80211_node *ni,
1863 struct ieee80211_tx_ampdu *tap)
1864 {
1865 struct ieee80211com *ic = ni->ni_ic;
1866 uint16_t args[4];
1867 int tid, dialogtoken;
1868 static int tokens = 0; /* XXX */
1869
1870 /* XXX locking */
1871 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
1872 /* do deferred setup of state */
1873 ampdu_tx_setup(tap);
1874 }
1875 /* XXX hack for not doing proper locking */
1876 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
1877
1878 dialogtoken = (tokens+1) % 63; /* XXX */
1879 tid = WME_AC_TO_TID(tap->txa_ac);
1880 tap->txa_start = ni->ni_txseqs[tid];
1881
1882 args[0] = dialogtoken;
1883 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE
1884 | SM(tid, IEEE80211_BAPS_TID)
1885 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
1886 ;
1887 args[2] = 0; /* batimeout */
1888 /* NB: do first so there's no race against reply */
1889 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) {
1890 /* unable to setup state, don't make request */
1891 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1892 ni, "%s: could not setup BA stream for AC %d",
1893 __func__, tap->txa_ac);
1894 /* defer next try so we don't slam the driver with requests */
1895 tap->txa_attempts = ieee80211_addba_maxtries;
1896 /* NB: check in case driver wants to override */
1897 if (tap->txa_nextrequest <= ticks)
1898 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
1899 return 0;
1900 }
1901 tokens = dialogtoken; /* allocate token */
1902 /* NB: after calling ic_addba_request so driver can set txa_start */
1903 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START)
1904 | SM(0, IEEE80211_BASEQ_FRAG)
1905 ;
1906 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1907 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
1908 }
1909
1910 /*
1911 * Terminate an AMPDU tx stream. State is reclaimed
1912 * and the peer notified with a DelBA Action frame.
1913 */
1914 void
1915 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
1916 int reason)
1917 {
1918 struct ieee80211com *ic = ni->ni_ic;
1919 struct ieee80211vap *vap = ni->ni_vap;
1920 uint16_t args[4];
1921
1922 /* XXX locking */
1923 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
1924 if (IEEE80211_AMPDU_RUNNING(tap)) {
1925 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1926 ni, "%s: stop BA stream for AC %d (reason %d)",
1927 __func__, tap->txa_ac, reason);
1928 vap->iv_stats.is_ampdu_stop++;
1929
1930 ic->ic_addba_stop(ni, tap);
1931 args[0] = WME_AC_TO_TID(tap->txa_ac);
1932 args[1] = IEEE80211_DELBAPS_INIT;
1933 args[2] = reason; /* XXX reason code */
1934 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1935 IEEE80211_ACTION_BA_DELBA, args);
1936 } else {
1937 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1938 ni, "%s: BA stream for AC %d not running (reason %d)",
1939 __func__, tap->txa_ac, reason);
1940 vap->iv_stats.is_ampdu_stop_failed++;
1941 }
1942 }
1943
1944 static void
1945 bar_timeout_callout(void *arg)
1946 {
1947 struct ieee80211_tx_ampdu *tap = arg;
1948 struct ieee80211_node *ni;
1949
1950 wlan_serialize_enter();
1951 ni = tap->txa_ni;
1952 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
1953 ("bar/addba collision, flags 0x%x", tap->txa_flags));
1954
1955 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1956 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
1957 tap->txa_ac, tap->txa_flags, tap->txa_attempts);
1958
1959 /* guard against race with bar_tx_complete */
1960 if (tap->txa_flags & IEEE80211_AGGR_BARPEND) {
1961 /* XXX ? */
1962 if (tap->txa_attempts >= ieee80211_bar_maxtries)
1963 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
1964 else
1965 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
1966 }
1967 wlan_serialize_exit();
1968 }
1969
1970 static void
1971 bar_start_timer(struct ieee80211_tx_ampdu *tap)
1972 {
1973 callout_reset(&tap->txa_timer, ieee80211_bar_timeout,
1974 bar_timeout_callout, tap);
1975 }
1976
1977 static void
1978 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
1979 {
1980 callout_stop(&tap->txa_timer);
1981 }
1982
1983 static void
1984 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
1985 {
1986 struct ieee80211_tx_ampdu *tap = arg;
1987
1988 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1989 ni, "%s: tid %u flags 0x%x pending %d status %d",
1990 __func__, tap->txa_ac, tap->txa_flags,
1991 callout_pending(&tap->txa_timer), status);
1992
1993 /* XXX locking */
1994 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
1995 callout_pending(&tap->txa_timer)) {
1996 struct ieee80211com *ic = ni->ni_ic;
1997
1998 if (status) /* ACK'd */
1999 bar_stop_timer(tap);
2000 ic->ic_bar_response(ni, tap, status);
2001 /* NB: just let timer expire so we pace requests */
2002 }
2003 }
2004
2005 static void
2006 ieee80211_bar_response(struct ieee80211_node *ni,
2007 struct ieee80211_tx_ampdu *tap, int status)
2008 {
2009
2010 if (status != 0) { /* got ACK */
2011 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2012 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2013 tap->txa_start,
2014 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2015 tap->txa_qframes, tap->txa_seqpending,
2016 WME_AC_TO_TID(tap->txa_ac));
2017
2018 /* NB: timer already stopped in bar_tx_complete */
2019 tap->txa_start = tap->txa_seqpending;
2020 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2021 }
2022 }
2023
2024 /*
2025 * Transmit a BAR frame to the specified node. The
2026 * BAR contents are drawn from the supplied aggregation
2027 * state associated with the node.
2028 *
2029 * NB: we only handle immediate ACK w/ compressed bitmap.
2030 */
2031 int
2032 ieee80211_send_bar(struct ieee80211_node *ni,
2033 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2034 {
2035 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2036 struct ieee80211vap *vap = ni->ni_vap;
2037 struct ieee80211com *ic = ni->ni_ic;
2038 struct ieee80211_frame_bar *bar;
2039 struct mbuf *m;
2040 uint16_t barctl, barseqctl;
2041 uint8_t *frm;
2042 int tid, ret;
2043
2044 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2045 /* no ADDBA response, should not happen */
2046 /* XXX stat+msg */
2047 return EINVAL;
2048 }
2049 /* XXX locking */
2050 bar_stop_timer(tap);
2051
2052 ieee80211_ref_node(ni);
2053
2054 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2055 if (m == NULL)
2056 senderr(ENOMEM, is_tx_nobuf);
2057
2058 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2059 m_freem(m);
2060 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2061 /* NOTREACHED */
2062 }
2063
2064 bar = mtod(m, struct ieee80211_frame_bar *);
2065 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2066 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2067 bar->i_fc[1] = 0;
2068 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2069 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2070
2071 tid = WME_AC_TO_TID(tap->txa_ac);
2072 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2073 0 : IEEE80211_BAR_NOACK)
2074 | IEEE80211_BAR_COMP
2075 | SM(tid, IEEE80211_BAR_TID)
2076 ;
2077 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2078 /* NB: known to have proper alignment */
2079 bar->i_ctl = htole16(barctl);
2080 bar->i_seq = htole16(barseqctl);
2081 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2082
2083 M_WME_SETAC(m, WME_AC_VO);
2084
2085 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2086
2087 /* XXX locking */
2088 /* init/bump attempts counter */
2089 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2090 tap->txa_attempts = 1;
2091 else
2092 tap->txa_attempts++;
2093 tap->txa_seqpending = seq;
2094 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2095
2096 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2097 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2098 tid, barctl, seq, tap->txa_attempts);
2099
2100 ret = ic->ic_raw_xmit(ni, m, NULL);
2101 if (ret != 0) {
2102 /* xmit failed, clear state flag */
2103 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2104 goto bad;
2105 }
2106 /* XXX hack against tx complete happening before timer is started */
2107 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2108 bar_start_timer(tap);
2109 return 0;
2110 bad:
2111 ieee80211_free_node(ni);
2112 return ret;
2113 #undef senderr
2114 }
2115
2116 static int
2117 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
2118 {
2119 struct ieee80211_bpf_params params;
2120
2121 memset(&params, 0, sizeof(params));
2122 params.ibp_pri = WME_AC_VO;
2123 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2124 /* NB: we know all frames are unicast */
2125 params.ibp_try0 = ni->ni_txparms->maxretry;
2126 params.ibp_power = ni->ni_txpower;
2127 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2128 &params);
2129 }
2130
2131 #define ADDSHORT(frm, v) do { \
2132 frm[0] = (v) & 0xff; \
2133 frm[1] = (v) >> 8; \
2134 frm += 2; \
2135 } while (0)
2136
2137 /*
2138 * Send an action management frame. The arguments are stuff
2139 * into a frame without inspection; the caller is assumed to
2140 * prepare them carefully (e.g. based on the aggregation state).
2141 */
2142 static int
2143 ht_send_action_ba_addba(struct ieee80211_node *ni,
2144 int category, int action, void *arg0)
2145 {
2146 struct ieee80211vap *vap = ni->ni_vap;
2147 struct ieee80211com *ic = ni->ni_ic;
2148 uint16_t *args = arg0;
2149 struct mbuf *m;
2150 uint8_t *frm;
2151
2152 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2153 "send ADDBA %s: dialogtoken %d "
2154 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2155 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
2156 "request" : "response",
2157 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID),
2158 args[2], args[3]);
2159
2160 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2161 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", __func__, __LINE__,
2162 ni, ni->ni_macaddr, ":", ieee80211_node_refcnt(ni)+1);
2163 ieee80211_ref_node(ni);
2164
2165 m = ieee80211_getmgtframe(&frm,
2166 ic->ic_headroom + sizeof(struct ieee80211_frame),
2167 sizeof(uint16_t) /* action+category */
2168 /* XXX may action payload */
2169 + sizeof(struct ieee80211_action_ba_addbaresponse)
2170 );
2171 if (m != NULL) {
2172 *frm++ = category;
2173 *frm++ = action;
2174 *frm++ = args[0]; /* dialog token */
2175 ADDSHORT(frm, args[1]); /* baparamset */
2176 ADDSHORT(frm, args[2]); /* batimeout */
2177 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
2178 ADDSHORT(frm, args[3]); /* baseqctl */
2179 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2180 return ht_action_output(ni, m);
2181 } else {
2182 vap->iv_stats.is_tx_nobuf++;
2183 ieee80211_free_node(ni);
2184 return ENOMEM;
2185 }
2186 }
2187
2188 static int
2189 ht_send_action_ba_delba(struct ieee80211_node *ni,
2190 int category, int action, void *arg0)
2191 {
2192 struct ieee80211vap *vap = ni->ni_vap;
2193 struct ieee80211com *ic = ni->ni_ic;
2194 uint16_t *args = arg0;
2195 struct mbuf *m;
2196 uint16_t baparamset;
2197 uint8_t *frm;
2198
2199 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2200 | args[1]
2201 ;
2202 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2203 "send DELBA action: tid %d, initiator %d reason %d",
2204 args[0], args[1], args[2]);
2205
2206 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2207 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", __func__, __LINE__,
2208 ni, ni->ni_macaddr, ":", ieee80211_node_refcnt(ni)+1);
2209 ieee80211_ref_node(ni);
2210
2211 m = ieee80211_getmgtframe(&frm,
2212 ic->ic_headroom + sizeof(struct ieee80211_frame),
2213 sizeof(uint16_t) /* action+category */
2214 /* XXX may action payload */
2215 + sizeof(struct ieee80211_action_ba_addbaresponse)
2216 );
2217 if (m != NULL) {
2218 *frm++ = category;
2219 *frm++ = action;
2220 ADDSHORT(frm, baparamset);
2221 ADDSHORT(frm, args[2]); /* reason code */
2222 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2223 return ht_action_output(ni, m);
2224 } else {
2225 vap->iv_stats.is_tx_nobuf++;
2226 ieee80211_free_node(ni);
2227 return ENOMEM;
2228 }
2229 }
2230
2231 static int
2232 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
2233 int category, int action, void *arg0)
2234 {
2235 struct ieee80211vap *vap = ni->ni_vap;
2236 struct ieee80211com *ic = ni->ni_ic;
2237 struct mbuf *m;
2238 uint8_t *frm;
2239
2240 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2241 "send HT txchwidth: width %d",
2242 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
2243
2244 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2245 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", __func__, __LINE__,
2246 ni, ni->ni_macaddr, ":", ieee80211_node_refcnt(ni)+1);
2247 ieee80211_ref_node(ni);
2248
2249 m = ieee80211_getmgtframe(&frm,
2250 ic->ic_headroom + sizeof(struct ieee80211_frame),
2251 sizeof(uint16_t) /* action+category */
2252 /* XXX may action payload */
2253 + sizeof(struct ieee80211_action_ba_addbaresponse)
2254 );
2255 if (m != NULL) {
2256 *frm++ = category;
2257 *frm++ = action;
2258 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2259 IEEE80211_A_HT_TXCHWIDTH_2040 :
2260 IEEE80211_A_HT_TXCHWIDTH_20;
2261 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2262 return ht_action_output(ni, m);
2263 } else {
2264 vap->iv_stats.is_tx_nobuf++;
2265 ieee80211_free_node(ni);
2266 return ENOMEM;
2267 }
2268 }
2269 #undef ADDSHORT
2270
2271 /*
2272 * Construct the MCS bit mask for inclusion
2273 * in an HT information element.
2274 */
2275 static void
2276 ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2277 {
2278 int i;
2279
2280 for (i = 0; i < rs->rs_nrates; i++) {
2281 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2282 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */
2283 /* NB: this assumes a particular implementation */
2284 setbit(frm, r);
2285 }
2286 }
2287 }
2288
2289 /*
2290 * Add body of an HTCAP information element.
2291 */
2292 static uint8_t *
2293 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2294 {
2295 #define ADDSHORT(frm, v) do { \
2296 frm[0] = (v) & 0xff; \
2297 frm[1] = (v) >> 8; \
2298 frm += 2; \
2299 } while (0)
2300 struct ieee80211vap *vap = ni->ni_vap;
2301 uint16_t caps;
2302 int rxmax, density;
2303
2304 /* HT capabilities */
2305 caps = vap->iv_htcaps & 0xffff;
2306 /*
2307 * Note channel width depends on whether we are operating as
2308 * a sta or not. When operating as a sta we are generating
2309 * a request based on our desired configuration. Otherwise
2310 * we are operational and the channel attributes identify
2311 * how we've been setup (which might be different if a fixed
2312 * channel is specified).
2313 */
2314 if (vap->iv_opmode == IEEE80211_M_STA) {
2315 /* override 20/40 use based on config */
2316 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2317 caps |= IEEE80211_HTCAP_CHWIDTH40;
2318 else
2319 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2320 /* use advertised setting (XXX locally constraint) */
2321 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2322 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2323 } else {
2324 /* override 20/40 use based on current channel */
2325 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2326 caps |= IEEE80211_HTCAP_CHWIDTH40;
2327 else
2328 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2329 rxmax = vap->iv_ampdu_rxmax;
2330 density = vap->iv_ampdu_density;
2331 }
2332 /* adjust short GI based on channel and config */
2333 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2334 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2335 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2336 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2337 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2338 ADDSHORT(frm, caps);
2339
2340 /* HT parameters */
2341 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2342 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2343 ;
2344 frm++;
2345
2346 /* pre-zero remainder of ie */
2347 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2348 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2349
2350 /* supported MCS set */
2351 /*
2352 * XXX it would better to get the rate set from ni_htrates
2353 * so we can restrict it but for sta mode ni_htrates isn't
2354 * setup when we're called to form an AssocReq frame so for
2355 * now we're restricted to the default HT rate set.
2356 */
2357 ieee80211_set_htrates(frm, &ieee80211_rateset_11n);
2358
2359 frm += sizeof(struct ieee80211_ie_htcap) -
2360 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2361 return frm;
2362 #undef ADDSHORT
2363 }
2364
2365 /*
2366 * Add 802.11n HT capabilities information element
2367 */
2368 uint8_t *
2369 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2370 {
2371 frm[0] = IEEE80211_ELEMID_HTCAP;
2372 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2373 return ieee80211_add_htcap_body(frm + 2, ni);
2374 }
2375
2376 /*
2377 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2378 * used for compatibility w/ pre-draft implementations.
2379 */
2380 uint8_t *
2381 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2382 {
2383 frm[0] = IEEE80211_ELEMID_VENDOR;
2384 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2385 frm[2] = (BCM_OUI >> 0) & 0xff;
2386 frm[3] = (BCM_OUI >> 8) & 0xff;
2387 frm[4] = (BCM_OUI >> 16) & 0xff;
2388 frm[5] = BCM_OUI_HTCAP;
2389 return ieee80211_add_htcap_body(frm + 6, ni);
2390 }
2391
2392 /*
2393 * Construct the MCS bit mask of basic rates
2394 * for inclusion in an HT information element.
2395 */
2396 static void
2397 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2398 {
2399 int i;
2400
2401 for (i = 0; i < rs->rs_nrates; i++) {
2402 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2403 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2404 r < IEEE80211_HTRATE_MAXSIZE) {
2405 /* NB: this assumes a particular implementation */
2406 setbit(frm, r);
2407 }
2408 }
2409 }
2410
2411 /*
2412 * Update the HTINFO ie for a beacon frame.
2413 */
2414 void
2415 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2416 struct ieee80211_beacon_offsets *bo)
2417 {
2418 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2419 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
2420 struct ieee80211com *ic = vap->iv_ic;
2421 struct ieee80211_ie_htinfo *ht =
2422 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2423
2424 /* XXX only update on channel change */
2425 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2426 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2427 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2428 else
2429 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2430 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2431 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2432 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2433 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2434 else
2435 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2436 if (IEEE80211_IS_CHAN_HT40(bsschan))
2437 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2438
2439 /* protection mode */
2440 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2441
2442 /* XXX propagate to vendor ie's */
2443 #undef PROTMODE
2444 }
2445
2446 /*
2447 * Add body of an HTINFO information element.
2448 *
2449 * NB: We don't use struct ieee80211_ie_htinfo because we can
2450 * be called to fillin both a standard ie and a compat ie that
2451 * has a vendor OUI at the front.
2452 */
2453 static uint8_t *
2454 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2455 {
2456 struct ieee80211vap *vap = ni->ni_vap;
2457 struct ieee80211com *ic = ni->ni_ic;
2458
2459 /* pre-zero remainder of ie */
2460 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2461
2462 /* primary/control channel center */
2463 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2464
2465 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2466 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2467 else
2468 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2469 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2470 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2471 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2472 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2473 else
2474 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2475 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2476 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2477
2478 frm[1] = ic->ic_curhtprotmode;
2479
2480 frm += 5;
2481
2482 /* basic MCS set */
2483 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2484 frm += sizeof(struct ieee80211_ie_htinfo) -
2485 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2486 return frm;
2487 }
2488
2489 /*
2490 * Add 802.11n HT information information element.
2491 */
2492 uint8_t *
2493 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2494 {
2495 frm[0] = IEEE80211_ELEMID_HTINFO;
2496 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2497 return ieee80211_add_htinfo_body(frm + 2, ni);
2498 }
2499
2500 /*
2501 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2502 * used for compatibility w/ pre-draft implementations.
2503 */
2504 uint8_t *
2505 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2506 {
2507 frm[0] = IEEE80211_ELEMID_VENDOR;
2508 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2509 frm[2] = (BCM_OUI >> 0) & 0xff;
2510 frm[3] = (BCM_OUI >> 8) & 0xff;
2511 frm[4] = (BCM_OUI >> 16) & 0xff;
2512 frm[5] = BCM_OUI_HTINFO;
2513 return ieee80211_add_htinfo_body(frm + 6, ni);
2514 }
DragonFly BSD