29#endif
30
31/*
32 * IEEE 802.11n protocol support.
33 */
34
35#include "opt_inet.h"
36#include "opt_wlan.h"
37
38#include <sys/param.h>
39#include <sys/kernel.h>
40#include <sys/systm.h>
41#include <sys/endian.h>
42
43#include <sys/socket.h>
44
45#include <net/if.h>
46#include <net/if_media.h>
47#include <net/ethernet.h>
48
49#include <net80211/ieee80211_var.h>
50#include <net80211/ieee80211_input.h>
51
52/* define here, used throughout file */
53#define MS(_v, _f) (((_v) & _f) >> _f##_S)
54#define SM(_v, _f) (((_v) << _f##_S) & _f)
55
56const struct ieee80211_mcs_rates ieee80211_htrates[16] = {
57 { 13, 14, 27, 30 }, /* MCS 0 */
58 { 26, 29, 54, 60 }, /* MCS 1 */
59 { 39, 43, 81, 90 }, /* MCS 2 */
60 { 52, 58, 108, 120 }, /* MCS 3 */
61 { 78, 87, 162, 180 }, /* MCS 4 */
62 { 104, 116, 216, 240 }, /* MCS 5 */
63 { 117, 130, 243, 270 }, /* MCS 6 */
64 { 130, 144, 270, 300 }, /* MCS 7 */
65 { 26, 29, 54, 60 }, /* MCS 8 */
66 { 52, 58, 108, 120 }, /* MCS 9 */
67 { 78, 87, 162, 180 }, /* MCS 10 */
68 { 104, 116, 216, 240 }, /* MCS 11 */
69 { 156, 173, 324, 360 }, /* MCS 12 */
70 { 208, 231, 432, 480 }, /* MCS 13 */
71 { 234, 260, 486, 540 }, /* MCS 14 */
72 { 260, 289, 540, 600 } /* MCS 15 */
73};
74
75static const struct ieee80211_htrateset ieee80211_rateset_11n =
76 { 16, {
77 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
78 10, 11, 12, 13, 14, 15 }
79 };
80
81#ifdef IEEE80211_AMPDU_AGE
82static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
83SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
84 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
85 "AMPDU max reorder age (ms)");
86#endif
87
88static int ieee80211_recv_bar_ena = 1;
89SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
90 0, "BAR frame processing (ena/dis)");
91
92static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
93SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
94 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
95 "ADDBA request timeout (ms)");
96static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
97SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
98 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
99 "ADDBA request backoff (ms)");
100static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
101SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW,
102 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
103
104static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
105static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
106
107/*
108 * Setup HT parameters that depends on the clock frequency.
109 */
110static void
111ieee80211_ht_setup(void)
112{
113#ifdef IEEE80211_AMPDU_AGE
114 ieee80211_ampdu_age = msecs_to_ticks(500);
115#endif
116 ieee80211_addba_timeout = msecs_to_ticks(250);
117 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
118 ieee80211_bar_timeout = msecs_to_ticks(250);
119}
120SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL);
121
122static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
123 struct ieee80211_tx_ampdu *tap);
124static int ieee80211_addba_request(struct ieee80211_node *ni,
125 struct ieee80211_tx_ampdu *tap,
126 int dialogtoken, int baparamset, int batimeout);
127static int ieee80211_addba_response(struct ieee80211_node *ni,
128 struct ieee80211_tx_ampdu *tap,
129 int code, int baparamset, int batimeout);
130static void ieee80211_addba_stop(struct ieee80211_node *ni,
131 struct ieee80211_tx_ampdu *tap);
132static void ieee80211_aggr_recv_action(struct ieee80211_node *ni,
133 const uint8_t *frm, const uint8_t *efrm);
134static void ieee80211_bar_response(struct ieee80211_node *ni,
135 struct ieee80211_tx_ampdu *tap, int status);
136static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
137static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
138static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
139 int baparamset, int batimeout, int baseqctl);
140static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
141
142void
143ieee80211_ht_attach(struct ieee80211com *ic)
144{
145 /* setup default aggregation policy */
146 ic->ic_recv_action = ieee80211_aggr_recv_action;
147 ic->ic_send_action = ieee80211_send_action;
148 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
149 ic->ic_addba_request = ieee80211_addba_request;
150 ic->ic_addba_response = ieee80211_addba_response;
151 ic->ic_addba_stop = ieee80211_addba_stop;
152 ic->ic_bar_response = ieee80211_bar_response;
153 ic->ic_ampdu_rx_start = ampdu_rx_start;
154 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
155
156 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
157 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
158}
159
160void
161ieee80211_ht_detach(struct ieee80211com *ic)
162{
163}
164
165void
166ieee80211_ht_vattach(struct ieee80211vap *vap)
167{
168
169 /* driver can override defaults */
170 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
171 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
172 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
173 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
174 /* tx aggregation traffic thresholds */
175 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
176 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
177 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
178 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
179
180 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
181 /*
182 * Device is HT capable; enable all HT-related
183 * facilities by default.
184 * XXX these choices may be too aggressive.
185 */
186 vap->iv_flags_ht |= IEEE80211_FHT_HT
187 | IEEE80211_FHT_HTCOMPAT
188 ;
189 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
190 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
191 /* XXX infer from channel list? */
192 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
193 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
194 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
195 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
196 }
197 /* enable RIFS if capable */
198 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
199 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
200
201 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
202 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
203 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
204 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
205 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
206 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
207 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
208 }
209 /* NB: disable default legacy WDS, too many issues right now */
210 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
211 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
212}
213
214void
215ieee80211_ht_vdetach(struct ieee80211vap *vap)
216{
217}
218
219static void
220ht_announce(struct ieee80211com *ic, int mode,
221 const struct ieee80211_htrateset *rs)
222{
223 struct ifnet *ifp = ic->ic_ifp;
224 int i, rate, mword;
225
226 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]);
227 for (i = 0; i < rs->rs_nrates; i++) {
228 mword = ieee80211_rate2media(ic,
229 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode);
230 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
231 continue;
232 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns;
233 printf("%s%d%sMbps", (i != 0 ? " " : ""),
234 rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
235 }
236 printf("\n");
237}
238
239void
240ieee80211_ht_announce(struct ieee80211com *ic)
241{
242 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
243 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n);
244 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
245 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n);
246}
247
248const struct ieee80211_htrateset *
249ieee80211_get_suphtrates(struct ieee80211com *ic,
250 const struct ieee80211_channel *c)
251{
252 return &ieee80211_rateset_11n;
253}
254
255/*
256 * Receive processing.
257 */
258
259/*
260 * Decap the encapsulated A-MSDU frames and dispatch all but
261 * the last for delivery. The last frame is returned for
262 * delivery via the normal path.
263 */
264struct mbuf *
265ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
266{
267 struct ieee80211vap *vap = ni->ni_vap;
268 int framelen;
269 struct mbuf *n;
270
271 /* discard 802.3 header inserted by ieee80211_decap */
272 m_adj(m, sizeof(struct ether_header));
273
274 vap->iv_stats.is_amsdu_decap++;
275
276 for (;;) {
277 /*
278 * Decap the first frame, bust it apart from the
279 * remainder and deliver. We leave the last frame
280 * delivery to the caller (for consistency with other
281 * code paths, could also do it here).
282 */
283 m = ieee80211_decap1(m, &framelen);
284 if (m == NULL) {
285 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
286 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
287 vap->iv_stats.is_amsdu_tooshort++;
288 return NULL;
289 }
290 if (m->m_pkthdr.len == framelen)
291 break;
292 n = m_split(m, framelen, M_NOWAIT);
293 if (n == NULL) {
294 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
295 ni->ni_macaddr, "a-msdu",
296 "%s", "unable to split encapsulated frames");
297 vap->iv_stats.is_amsdu_split++;
298 m_freem(m); /* NB: must reclaim */
299 return NULL;
300 }
301 vap->iv_deliver_data(vap, ni, m);
302
303 /*
304 * Remove frame contents; each intermediate frame
305 * is required to be aligned to a 4-byte boundary.
306 */
307 m = n;
308 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
309 }
310 return m; /* last delivered by caller */
311}
312
313/*
314 * Purge all frames in the A-MPDU re-order queue.
315 */
316static void
317ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
318{
319 struct mbuf *m;
320 int i;
321
322 for (i = 0; i < rap->rxa_wnd; i++) {
323 m = rap->rxa_m[i];
324 if (m != NULL) {
325 rap->rxa_m[i] = NULL;
326 rap->rxa_qbytes -= m->m_pkthdr.len;
327 m_freem(m);
328 if (--rap->rxa_qframes == 0)
329 break;
330 }
331 }
332 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
333 ("lost %u data, %u frames on ampdu rx q",
334 rap->rxa_qbytes, rap->rxa_qframes));
335}
336
337/*
338 * Start A-MPDU rx/re-order processing for the specified TID.
339 */
340static int
341ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
342 int baparamset, int batimeout, int baseqctl)
343{
344 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
345
346 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
347 /*
348 * AMPDU previously setup and not terminated with a DELBA,
349 * flush the reorder q's in case anything remains.
350 */
351 ampdu_rx_purge(rap);
352 }
353 memset(rap, 0, sizeof(*rap));
354 rap->rxa_wnd = (bufsiz == 0) ?
355 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
356 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
357 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
358
359 return 0;
360}
361
362/*
363 * Stop A-MPDU rx processing for the specified TID.
364 */
365static void
366ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
367{
368 ampdu_rx_purge(rap);
369 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
370}
371
372/*
373 * Dispatch a frame from the A-MPDU reorder queue. The
374 * frame is fed back into ieee80211_input marked with an
375 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
376 * permits ieee80211_input to optimize re-processing).
377 */
378static __inline void
379ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
380{
381 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
382 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
383 (void) ieee80211_input(ni, m, 0, 0);
384}
385
386/*
387 * Dispatch as many frames as possible from the re-order queue.
388 * Frames will always be "at the front"; we process all frames
389 * up to the first empty slot in the window. On completion we
390 * cleanup state if there are still pending frames in the current
391 * BA window. We assume the frame at slot 0 is already handled
392 * by the caller; we always start at slot 1.
393 */
394static void
395ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
396{
397 struct ieee80211vap *vap = ni->ni_vap;
398 struct mbuf *m;
399 int i;
400
401 /* flush run of frames */
402 for (i = 1; i < rap->rxa_wnd; i++) {
403 m = rap->rxa_m[i];
404 if (m == NULL)
405 break;
406 rap->rxa_m[i] = NULL;
407 rap->rxa_qbytes -= m->m_pkthdr.len;
408 rap->rxa_qframes--;
409
410 ampdu_dispatch(ni, m);
411 }
412 /*
413 * If frames remain, copy the mbuf pointers down so
414 * they correspond to the offsets in the new window.
415 */
416 if (rap->rxa_qframes != 0) {
417 int n = rap->rxa_qframes, j;
418 for (j = i+1; j < rap->rxa_wnd; j++) {
419 if (rap->rxa_m[j] != NULL) {
420 rap->rxa_m[j-i] = rap->rxa_m[j];
421 rap->rxa_m[j] = NULL;
422 if (--n == 0)
423 break;
424 }
425 }
426 KASSERT(n == 0, ("lost %d frames", n));
427 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
428 }
429 /*
430 * Adjust the start of the BA window to
431 * reflect the frames just dispatched.
432 */
433 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
434 vap->iv_stats.is_ampdu_rx_oor += i;
435}
436
437#ifdef IEEE80211_AMPDU_AGE
438/*
439 * Dispatch all frames in the A-MPDU re-order queue.
440 */
441static void
442ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
443{
444 struct ieee80211vap *vap = ni->ni_vap;
445 struct mbuf *m;
446 int i;
447
448 for (i = 0; i < rap->rxa_wnd; i++) {
449 m = rap->rxa_m[i];
450 if (m == NULL)
451 continue;
452 rap->rxa_m[i] = NULL;
453 rap->rxa_qbytes -= m->m_pkthdr.len;
454 rap->rxa_qframes--;
455 vap->iv_stats.is_ampdu_rx_oor++;
456
457 ampdu_dispatch(ni, m);
458 if (rap->rxa_qframes == 0)
459 break;
460 }
461}
462#endif /* IEEE80211_AMPDU_AGE */
463
464/*
465 * Dispatch all frames in the A-MPDU re-order queue
466 * preceding the specified sequence number. This logic
467 * handles window moves due to a received MSDU or BAR.
468 */
469static void
470ampdu_rx_flush_upto(struct ieee80211_node *ni,
471 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
472{
473 struct ieee80211vap *vap = ni->ni_vap;
474 struct mbuf *m;
475 ieee80211_seq seqno;
476 int i;
477
478 /*
479 * Flush any complete MSDU's with a sequence number lower
480 * than winstart. Gaps may exist. Note that we may actually
481 * dispatch frames past winstart if a run continues; this is
482 * an optimization that avoids having to do a separate pass
483 * to dispatch frames after moving the BA window start.
484 */
485 seqno = rap->rxa_start;
486 for (i = 0; i < rap->rxa_wnd; i++) {
487 m = rap->rxa_m[i];
488 if (m != NULL) {
489 rap->rxa_m[i] = NULL;
490 rap->rxa_qbytes -= m->m_pkthdr.len;
491 rap->rxa_qframes--;
492 vap->iv_stats.is_ampdu_rx_oor++;
493
494 ampdu_dispatch(ni, m);
495 } else {
496 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
497 break;
498 }
499 seqno = IEEE80211_SEQ_INC(seqno);
500 }
501 /*
502 * If frames remain, copy the mbuf pointers down so
503 * they correspond to the offsets in the new window.
504 */
505 if (rap->rxa_qframes != 0) {
506 int n = rap->rxa_qframes, j;
507
508 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
509 KASSERT(rap->rxa_m[0] == NULL,
510 ("%s: BA window slot 0 occupied", __func__));
511 for (j = i+1; j < rap->rxa_wnd; j++) {
512 if (rap->rxa_m[j] != NULL) {
513 rap->rxa_m[j-i] = rap->rxa_m[j];
514 rap->rxa_m[j] = NULL;
515 if (--n == 0)
516 break;
517 }
518 }
519 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
520 "BA win <%d:%d> winstart %d",
521 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
522 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
523 winstart));
524 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
525 }
526 /*
527 * Move the start of the BA window; we use the
528 * sequence number of the last MSDU that was
529 * passed up the stack+1 or winstart if stopped on
530 * a gap in the reorder buffer.
531 */
532 rap->rxa_start = seqno;
533}
534
535/*
536 * Process a received QoS data frame for an HT station. Handle
537 * A-MPDU reordering: if this frame is received out of order
538 * and falls within the BA window hold onto it. Otherwise if
539 * this frame completes a run, flush any pending frames. We
540 * return 1 if the frame is consumed. A 0 is returned if
541 * the frame should be processed normally by the caller.
542 */
543int
544ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
545{
546#define IEEE80211_FC0_QOSDATA \
547 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
548#define PROCESS 0 /* caller should process frame */
549#define CONSUMED 1 /* frame consumed, caller does nothing */
550 struct ieee80211vap *vap = ni->ni_vap;
551 struct ieee80211_qosframe *wh;
552 struct ieee80211_rx_ampdu *rap;
553 ieee80211_seq rxseq;
554 uint8_t tid;
555 int off;
556
557 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
558 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
559 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
560
561 /* NB: m_len known to be sufficient */
562 wh = mtod(m, struct ieee80211_qosframe *);
563 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
564 /*
565 * Not QoS data, shouldn't get here but just
566 * return it to the caller for processing.
567 */
568 return PROCESS;
569 }
| 29#endif
30
31/*
32 * IEEE 802.11n protocol support.
33 */
34
35#include "opt_inet.h"
36#include "opt_wlan.h"
37
38#include <sys/param.h>
39#include <sys/kernel.h>
40#include <sys/systm.h>
41#include <sys/endian.h>
42
43#include <sys/socket.h>
44
45#include <net/if.h>
46#include <net/if_media.h>
47#include <net/ethernet.h>
48
49#include <net80211/ieee80211_var.h>
50#include <net80211/ieee80211_input.h>
51
52/* define here, used throughout file */
53#define MS(_v, _f) (((_v) & _f) >> _f##_S)
54#define SM(_v, _f) (((_v) << _f##_S) & _f)
55
56const struct ieee80211_mcs_rates ieee80211_htrates[16] = {
57 { 13, 14, 27, 30 }, /* MCS 0 */
58 { 26, 29, 54, 60 }, /* MCS 1 */
59 { 39, 43, 81, 90 }, /* MCS 2 */
60 { 52, 58, 108, 120 }, /* MCS 3 */
61 { 78, 87, 162, 180 }, /* MCS 4 */
62 { 104, 116, 216, 240 }, /* MCS 5 */
63 { 117, 130, 243, 270 }, /* MCS 6 */
64 { 130, 144, 270, 300 }, /* MCS 7 */
65 { 26, 29, 54, 60 }, /* MCS 8 */
66 { 52, 58, 108, 120 }, /* MCS 9 */
67 { 78, 87, 162, 180 }, /* MCS 10 */
68 { 104, 116, 216, 240 }, /* MCS 11 */
69 { 156, 173, 324, 360 }, /* MCS 12 */
70 { 208, 231, 432, 480 }, /* MCS 13 */
71 { 234, 260, 486, 540 }, /* MCS 14 */
72 { 260, 289, 540, 600 } /* MCS 15 */
73};
74
75static const struct ieee80211_htrateset ieee80211_rateset_11n =
76 { 16, {
77 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
78 10, 11, 12, 13, 14, 15 }
79 };
80
81#ifdef IEEE80211_AMPDU_AGE
82static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
83SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
84 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
85 "AMPDU max reorder age (ms)");
86#endif
87
88static int ieee80211_recv_bar_ena = 1;
89SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
90 0, "BAR frame processing (ena/dis)");
91
92static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
93SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
94 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
95 "ADDBA request timeout (ms)");
96static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
97SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
98 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
99 "ADDBA request backoff (ms)");
100static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
101SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLTYPE_INT | CTLFLAG_RW,
102 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
103
104static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
105static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
106
107/*
108 * Setup HT parameters that depends on the clock frequency.
109 */
110static void
111ieee80211_ht_setup(void)
112{
113#ifdef IEEE80211_AMPDU_AGE
114 ieee80211_ampdu_age = msecs_to_ticks(500);
115#endif
116 ieee80211_addba_timeout = msecs_to_ticks(250);
117 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
118 ieee80211_bar_timeout = msecs_to_ticks(250);
119}
120SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL);
121
122static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
123 struct ieee80211_tx_ampdu *tap);
124static int ieee80211_addba_request(struct ieee80211_node *ni,
125 struct ieee80211_tx_ampdu *tap,
126 int dialogtoken, int baparamset, int batimeout);
127static int ieee80211_addba_response(struct ieee80211_node *ni,
128 struct ieee80211_tx_ampdu *tap,
129 int code, int baparamset, int batimeout);
130static void ieee80211_addba_stop(struct ieee80211_node *ni,
131 struct ieee80211_tx_ampdu *tap);
132static void ieee80211_aggr_recv_action(struct ieee80211_node *ni,
133 const uint8_t *frm, const uint8_t *efrm);
134static void ieee80211_bar_response(struct ieee80211_node *ni,
135 struct ieee80211_tx_ampdu *tap, int status);
136static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
137static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
138static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
139 int baparamset, int batimeout, int baseqctl);
140static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
141
142void
143ieee80211_ht_attach(struct ieee80211com *ic)
144{
145 /* setup default aggregation policy */
146 ic->ic_recv_action = ieee80211_aggr_recv_action;
147 ic->ic_send_action = ieee80211_send_action;
148 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
149 ic->ic_addba_request = ieee80211_addba_request;
150 ic->ic_addba_response = ieee80211_addba_response;
151 ic->ic_addba_stop = ieee80211_addba_stop;
152 ic->ic_bar_response = ieee80211_bar_response;
153 ic->ic_ampdu_rx_start = ampdu_rx_start;
154 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
155
156 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
157 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
158}
159
160void
161ieee80211_ht_detach(struct ieee80211com *ic)
162{
163}
164
165void
166ieee80211_ht_vattach(struct ieee80211vap *vap)
167{
168
169 /* driver can override defaults */
170 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
171 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
172 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
173 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
174 /* tx aggregation traffic thresholds */
175 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
176 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
177 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
178 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
179
180 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
181 /*
182 * Device is HT capable; enable all HT-related
183 * facilities by default.
184 * XXX these choices may be too aggressive.
185 */
186 vap->iv_flags_ht |= IEEE80211_FHT_HT
187 | IEEE80211_FHT_HTCOMPAT
188 ;
189 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
190 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
191 /* XXX infer from channel list? */
192 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
193 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
194 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
195 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
196 }
197 /* enable RIFS if capable */
198 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
199 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
200
201 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
202 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
203 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
204 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
205 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
206 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
207 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
208 }
209 /* NB: disable default legacy WDS, too many issues right now */
210 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
211 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
212}
213
214void
215ieee80211_ht_vdetach(struct ieee80211vap *vap)
216{
217}
218
219static void
220ht_announce(struct ieee80211com *ic, int mode,
221 const struct ieee80211_htrateset *rs)
222{
223 struct ifnet *ifp = ic->ic_ifp;
224 int i, rate, mword;
225
226 if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]);
227 for (i = 0; i < rs->rs_nrates; i++) {
228 mword = ieee80211_rate2media(ic,
229 rs->rs_rates[i] | IEEE80211_RATE_MCS, mode);
230 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
231 continue;
232 rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns;
233 printf("%s%d%sMbps", (i != 0 ? " " : ""),
234 rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
235 }
236 printf("\n");
237}
238
239void
240ieee80211_ht_announce(struct ieee80211com *ic)
241{
242 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
243 ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n);
244 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
245 ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n);
246}
247
248const struct ieee80211_htrateset *
249ieee80211_get_suphtrates(struct ieee80211com *ic,
250 const struct ieee80211_channel *c)
251{
252 return &ieee80211_rateset_11n;
253}
254
255/*
256 * Receive processing.
257 */
258
259/*
260 * Decap the encapsulated A-MSDU frames and dispatch all but
261 * the last for delivery. The last frame is returned for
262 * delivery via the normal path.
263 */
264struct mbuf *
265ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
266{
267 struct ieee80211vap *vap = ni->ni_vap;
268 int framelen;
269 struct mbuf *n;
270
271 /* discard 802.3 header inserted by ieee80211_decap */
272 m_adj(m, sizeof(struct ether_header));
273
274 vap->iv_stats.is_amsdu_decap++;
275
276 for (;;) {
277 /*
278 * Decap the first frame, bust it apart from the
279 * remainder and deliver. We leave the last frame
280 * delivery to the caller (for consistency with other
281 * code paths, could also do it here).
282 */
283 m = ieee80211_decap1(m, &framelen);
284 if (m == NULL) {
285 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
286 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
287 vap->iv_stats.is_amsdu_tooshort++;
288 return NULL;
289 }
290 if (m->m_pkthdr.len == framelen)
291 break;
292 n = m_split(m, framelen, M_NOWAIT);
293 if (n == NULL) {
294 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
295 ni->ni_macaddr, "a-msdu",
296 "%s", "unable to split encapsulated frames");
297 vap->iv_stats.is_amsdu_split++;
298 m_freem(m); /* NB: must reclaim */
299 return NULL;
300 }
301 vap->iv_deliver_data(vap, ni, m);
302
303 /*
304 * Remove frame contents; each intermediate frame
305 * is required to be aligned to a 4-byte boundary.
306 */
307 m = n;
308 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
309 }
310 return m; /* last delivered by caller */
311}
312
313/*
314 * Purge all frames in the A-MPDU re-order queue.
315 */
316static void
317ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
318{
319 struct mbuf *m;
320 int i;
321
322 for (i = 0; i < rap->rxa_wnd; i++) {
323 m = rap->rxa_m[i];
324 if (m != NULL) {
325 rap->rxa_m[i] = NULL;
326 rap->rxa_qbytes -= m->m_pkthdr.len;
327 m_freem(m);
328 if (--rap->rxa_qframes == 0)
329 break;
330 }
331 }
332 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
333 ("lost %u data, %u frames on ampdu rx q",
334 rap->rxa_qbytes, rap->rxa_qframes));
335}
336
337/*
338 * Start A-MPDU rx/re-order processing for the specified TID.
339 */
340static int
341ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
342 int baparamset, int batimeout, int baseqctl)
343{
344 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
345
346 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
347 /*
348 * AMPDU previously setup and not terminated with a DELBA,
349 * flush the reorder q's in case anything remains.
350 */
351 ampdu_rx_purge(rap);
352 }
353 memset(rap, 0, sizeof(*rap));
354 rap->rxa_wnd = (bufsiz == 0) ?
355 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
356 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
357 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
358
359 return 0;
360}
361
362/*
363 * Stop A-MPDU rx processing for the specified TID.
364 */
365static void
366ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
367{
368 ampdu_rx_purge(rap);
369 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
370}
371
372/*
373 * Dispatch a frame from the A-MPDU reorder queue. The
374 * frame is fed back into ieee80211_input marked with an
375 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
376 * permits ieee80211_input to optimize re-processing).
377 */
378static __inline void
379ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
380{
381 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
382 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
383 (void) ieee80211_input(ni, m, 0, 0);
384}
385
386/*
387 * Dispatch as many frames as possible from the re-order queue.
388 * Frames will always be "at the front"; we process all frames
389 * up to the first empty slot in the window. On completion we
390 * cleanup state if there are still pending frames in the current
391 * BA window. We assume the frame at slot 0 is already handled
392 * by the caller; we always start at slot 1.
393 */
394static void
395ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
396{
397 struct ieee80211vap *vap = ni->ni_vap;
398 struct mbuf *m;
399 int i;
400
401 /* flush run of frames */
402 for (i = 1; i < rap->rxa_wnd; i++) {
403 m = rap->rxa_m[i];
404 if (m == NULL)
405 break;
406 rap->rxa_m[i] = NULL;
407 rap->rxa_qbytes -= m->m_pkthdr.len;
408 rap->rxa_qframes--;
409
410 ampdu_dispatch(ni, m);
411 }
412 /*
413 * If frames remain, copy the mbuf pointers down so
414 * they correspond to the offsets in the new window.
415 */
416 if (rap->rxa_qframes != 0) {
417 int n = rap->rxa_qframes, j;
418 for (j = i+1; j < rap->rxa_wnd; j++) {
419 if (rap->rxa_m[j] != NULL) {
420 rap->rxa_m[j-i] = rap->rxa_m[j];
421 rap->rxa_m[j] = NULL;
422 if (--n == 0)
423 break;
424 }
425 }
426 KASSERT(n == 0, ("lost %d frames", n));
427 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
428 }
429 /*
430 * Adjust the start of the BA window to
431 * reflect the frames just dispatched.
432 */
433 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
434 vap->iv_stats.is_ampdu_rx_oor += i;
435}
436
437#ifdef IEEE80211_AMPDU_AGE
438/*
439 * Dispatch all frames in the A-MPDU re-order queue.
440 */
441static void
442ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
443{
444 struct ieee80211vap *vap = ni->ni_vap;
445 struct mbuf *m;
446 int i;
447
448 for (i = 0; i < rap->rxa_wnd; i++) {
449 m = rap->rxa_m[i];
450 if (m == NULL)
451 continue;
452 rap->rxa_m[i] = NULL;
453 rap->rxa_qbytes -= m->m_pkthdr.len;
454 rap->rxa_qframes--;
455 vap->iv_stats.is_ampdu_rx_oor++;
456
457 ampdu_dispatch(ni, m);
458 if (rap->rxa_qframes == 0)
459 break;
460 }
461}
462#endif /* IEEE80211_AMPDU_AGE */
463
464/*
465 * Dispatch all frames in the A-MPDU re-order queue
466 * preceding the specified sequence number. This logic
467 * handles window moves due to a received MSDU or BAR.
468 */
469static void
470ampdu_rx_flush_upto(struct ieee80211_node *ni,
471 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
472{
473 struct ieee80211vap *vap = ni->ni_vap;
474 struct mbuf *m;
475 ieee80211_seq seqno;
476 int i;
477
478 /*
479 * Flush any complete MSDU's with a sequence number lower
480 * than winstart. Gaps may exist. Note that we may actually
481 * dispatch frames past winstart if a run continues; this is
482 * an optimization that avoids having to do a separate pass
483 * to dispatch frames after moving the BA window start.
484 */
485 seqno = rap->rxa_start;
486 for (i = 0; i < rap->rxa_wnd; i++) {
487 m = rap->rxa_m[i];
488 if (m != NULL) {
489 rap->rxa_m[i] = NULL;
490 rap->rxa_qbytes -= m->m_pkthdr.len;
491 rap->rxa_qframes--;
492 vap->iv_stats.is_ampdu_rx_oor++;
493
494 ampdu_dispatch(ni, m);
495 } else {
496 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
497 break;
498 }
499 seqno = IEEE80211_SEQ_INC(seqno);
500 }
501 /*
502 * If frames remain, copy the mbuf pointers down so
503 * they correspond to the offsets in the new window.
504 */
505 if (rap->rxa_qframes != 0) {
506 int n = rap->rxa_qframes, j;
507
508 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
509 KASSERT(rap->rxa_m[0] == NULL,
510 ("%s: BA window slot 0 occupied", __func__));
511 for (j = i+1; j < rap->rxa_wnd; j++) {
512 if (rap->rxa_m[j] != NULL) {
513 rap->rxa_m[j-i] = rap->rxa_m[j];
514 rap->rxa_m[j] = NULL;
515 if (--n == 0)
516 break;
517 }
518 }
519 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
520 "BA win <%d:%d> winstart %d",
521 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
522 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
523 winstart));
524 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
525 }
526 /*
527 * Move the start of the BA window; we use the
528 * sequence number of the last MSDU that was
529 * passed up the stack+1 or winstart if stopped on
530 * a gap in the reorder buffer.
531 */
532 rap->rxa_start = seqno;
533}
534
535/*
536 * Process a received QoS data frame for an HT station. Handle
537 * A-MPDU reordering: if this frame is received out of order
538 * and falls within the BA window hold onto it. Otherwise if
539 * this frame completes a run, flush any pending frames. We
540 * return 1 if the frame is consumed. A 0 is returned if
541 * the frame should be processed normally by the caller.
542 */
543int
544ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
545{
546#define IEEE80211_FC0_QOSDATA \
547 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
548#define PROCESS 0 /* caller should process frame */
549#define CONSUMED 1 /* frame consumed, caller does nothing */
550 struct ieee80211vap *vap = ni->ni_vap;
551 struct ieee80211_qosframe *wh;
552 struct ieee80211_rx_ampdu *rap;
553 ieee80211_seq rxseq;
554 uint8_t tid;
555 int off;
556
557 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
558 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
559 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
560
561 /* NB: m_len known to be sufficient */
562 wh = mtod(m, struct ieee80211_qosframe *);
563 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
564 /*
565 * Not QoS data, shouldn't get here but just
566 * return it to the caller for processing.
567 */
568 return PROCESS;
569 }
|
571 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
572 else
573 tid = wh->i_qos[0];
574 tid &= IEEE80211_QOS_TID;
575 rap = &ni->ni_rx_ampdu[tid];
576 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
577 /*
578 * No ADDBA request yet, don't touch.
579 */
580 return PROCESS;
581 }
582 rxseq = le16toh(*(uint16_t *)wh->i_seq);
583 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
584 /*
585 * Fragments are not allowed; toss.
586 */
587 IEEE80211_DISCARD_MAC(vap,
588 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
589 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
590 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
591 vap->iv_stats.is_ampdu_rx_drop++;
592 IEEE80211_NODE_STAT(ni, rx_drop);
593 m_freem(m);
594 return CONSUMED;
595 }
596 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
597 rap->rxa_nframes++;
598again:
599 if (rxseq == rap->rxa_start) {
600 /*
601 * First frame in window.
602 */
603 if (rap->rxa_qframes != 0) {
604 /*
605 * Dispatch as many packets as we can.
606 */
607 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
608 ampdu_dispatch(ni, m);
609 ampdu_rx_dispatch(rap, ni);
610 return CONSUMED;
611 } else {
612 /*
613 * In order; advance window and notify
614 * caller to dispatch directly.
615 */
616 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
617 return PROCESS;
618 }
619 }
620 /*
621 * Frame is out of order; store if in the BA window.
622 */
623 /* calculate offset in BA window */
624 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
625 if (off < rap->rxa_wnd) {
626 /*
627 * Common case (hopefully): in the BA window.
628 * Sec 9.10.7.6 a) (D2.04 p.118 line 47)
629 */
630#ifdef IEEE80211_AMPDU_AGE
631 /*
632 * Check for frames sitting too long in the reorder queue.
633 * This should only ever happen if frames are not delivered
634 * without the sender otherwise notifying us (e.g. with a
635 * BAR to move the window). Typically this happens because
636 * of vendor bugs that cause the sequence number to jump.
637 * When this happens we get a gap in the reorder queue that
638 * leaves frame sitting on the queue until they get pushed
639 * out due to window moves. When the vendor does not send
640 * BAR this move only happens due to explicit packet sends
641 *
642 * NB: we only track the time of the oldest frame in the
643 * reorder q; this means that if we flush we might push
644 * frames that still "new"; if this happens then subsequent
645 * frames will result in BA window moves which cost something
646 * but is still better than a big throughput dip.
647 */
648 if (rap->rxa_qframes != 0) {
649 /* XXX honor batimeout? */
650 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
651 /*
652 * Too long since we received the first
653 * frame; flush the reorder buffer.
654 */
655 if (rap->rxa_qframes != 0) {
656 vap->iv_stats.is_ampdu_rx_age +=
657 rap->rxa_qframes;
658 ampdu_rx_flush(ni, rap);
659 }
660 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
661 return PROCESS;
662 }
663 } else {
664 /*
665 * First frame, start aging timer.
666 */
667 rap->rxa_age = ticks;
668 }
669#endif /* IEEE80211_AMPDU_AGE */
670 /* save packet */
671 if (rap->rxa_m[off] == NULL) {
672 rap->rxa_m[off] = m;
673 rap->rxa_qframes++;
674 rap->rxa_qbytes += m->m_pkthdr.len;
675 vap->iv_stats.is_ampdu_rx_reorder++;
676 } else {
677 IEEE80211_DISCARD_MAC(vap,
678 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
679 ni->ni_macaddr, "a-mpdu duplicate",
680 "seqno %u tid %u BA win <%u:%u>",
681 rxseq, tid, rap->rxa_start,
682 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
683 vap->iv_stats.is_rx_dup++;
684 IEEE80211_NODE_STAT(ni, rx_dup);
685 m_freem(m);
686 }
687 return CONSUMED;
688 }
689 if (off < IEEE80211_SEQ_BA_RANGE) {
690 /*
691 * Outside the BA window, but within range;
692 * flush the reorder q and move the window.
693 * Sec 9.10.7.6 b) (D2.04 p.118 line 60)
694 */
695 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
696 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
697 rap->rxa_start,
698 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
699 rap->rxa_qframes, rxseq, tid);
700 vap->iv_stats.is_ampdu_rx_move++;
701
702 /*
703 * The spec says to flush frames up to but not including:
704 * WinStart_B = rxseq - rap->rxa_wnd + 1
705 * Then insert the frame or notify the caller to process
706 * it immediately. We can safely do this by just starting
707 * over again because we know the frame will now be within
708 * the BA window.
709 */
710 /* NB: rxa_wnd known to be >0 */
711 ampdu_rx_flush_upto(ni, rap,
712 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
713 goto again;
714 } else {
715 /*
716 * Outside the BA window and out of range; toss.
717 * Sec 9.10.7.6 c) (D2.04 p.119 line 16)
718 */
719 IEEE80211_DISCARD_MAC(vap,
720 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
721 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
722 rap->rxa_start,
723 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
724 rap->rxa_qframes, rxseq, tid,
725 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
726 vap->iv_stats.is_ampdu_rx_drop++;
727 IEEE80211_NODE_STAT(ni, rx_drop);
728 m_freem(m);
729 return CONSUMED;
730 }
731#undef CONSUMED
732#undef PROCESS
733#undef IEEE80211_FC0_QOSDATA
734}
735
736/*
737 * Process a BAR ctl frame. Dispatch all frames up to
738 * the sequence number of the frame. If this frame is
739 * out of range it's discarded.
740 */
741void
742ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
743{
744 struct ieee80211vap *vap = ni->ni_vap;
745 struct ieee80211_frame_bar *wh;
746 struct ieee80211_rx_ampdu *rap;
747 ieee80211_seq rxseq;
748 int tid, off;
749
750 if (!ieee80211_recv_bar_ena) {
751#if 0
752 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
753 ni->ni_macaddr, "BAR", "%s", "processing disabled");
754#endif
755 vap->iv_stats.is_ampdu_bar_bad++;
756 return;
757 }
758 wh = mtod(m0, struct ieee80211_frame_bar *);
759 /* XXX check basic BAR */
760 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
761 rap = &ni->ni_rx_ampdu[tid];
762 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
763 /*
764 * No ADDBA request yet, don't touch.
765 */
766 IEEE80211_DISCARD_MAC(vap,
767 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
768 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
769 vap->iv_stats.is_ampdu_bar_bad++;
770 return;
771 }
772 vap->iv_stats.is_ampdu_bar_rx++;
773 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
774 if (rxseq == rap->rxa_start)
775 return;
776 /* calculate offset in BA window */
777 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
778 if (off < IEEE80211_SEQ_BA_RANGE) {
779 /*
780 * Flush the reorder q up to rxseq and move the window.
781 * Sec 9.10.7.6 a) (D2.04 p.119 line 22)
782 */
783 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
784 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
785 rap->rxa_start,
786 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
787 rap->rxa_qframes, rxseq, tid);
788 vap->iv_stats.is_ampdu_bar_move++;
789
790 ampdu_rx_flush_upto(ni, rap, rxseq);
791 if (off >= rap->rxa_wnd) {
792 /*
793 * BAR specifies a window start to the right of BA
794 * window; we must move it explicitly since
795 * ampdu_rx_flush_upto will not.
796 */
797 rap->rxa_start = rxseq;
798 }
799 } else {
800 /*
801 * Out of range; toss.
802 * Sec 9.10.7.6 b) (D2.04 p.119 line 41)
803 */
804 IEEE80211_DISCARD_MAC(vap,
805 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
806 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
807 rap->rxa_start,
808 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
809 rap->rxa_qframes, rxseq, tid,
810 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
811 vap->iv_stats.is_ampdu_bar_oow++;
812 IEEE80211_NODE_STAT(ni, rx_drop);
813 }
814}
815
816/*
817 * Setup HT-specific state in a node. Called only
818 * when HT use is negotiated so we don't do extra
819 * work for temporary and/or legacy sta's.
820 */
821void
822ieee80211_ht_node_init(struct ieee80211_node *ni)
823{
824 struct ieee80211_tx_ampdu *tap;
825 int ac;
826
827 if (ni->ni_flags & IEEE80211_NODE_HT) {
828 /*
829 * Clean AMPDU state on re-associate. This handles the case
830 * where a station leaves w/o notifying us and then returns
831 * before node is reaped for inactivity.
832 */
833 ieee80211_ht_node_cleanup(ni);
834 }
835 for (ac = 0; ac < WME_NUM_AC; ac++) {
836 tap = &ni->ni_tx_ampdu[ac];
837 tap->txa_ac = ac;
838 tap->txa_ni = ni;
839 /* NB: further initialization deferred */
840 }
841 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
842}
843
844/*
845 * Cleanup HT-specific state in a node. Called only
846 * when HT use has been marked.
847 */
848void
849ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
850{
851 struct ieee80211com *ic = ni->ni_ic;
852 int i;
853
854 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
855
856 /* XXX optimize this */
857 for (i = 0; i < WME_NUM_AC; i++) {
858 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
859 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
860 ampdu_tx_stop(tap);
861 }
862 for (i = 0; i < WME_NUM_TID; i++)
863 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
864
865 ni->ni_htcap = 0;
866 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
867}
868
869/*
870 * Age out HT resources for a station.
871 */
872void
873ieee80211_ht_node_age(struct ieee80211_node *ni)
874{
875#ifdef IEEE80211_AMPDU_AGE
876 struct ieee80211vap *vap = ni->ni_vap;
877 uint8_t tid;
878#endif
879
880 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
881
882#ifdef IEEE80211_AMPDU_AGE
883 for (tid = 0; tid < WME_NUM_TID; tid++) {
884 struct ieee80211_rx_ampdu *rap;
885
886 rap = &ni->ni_rx_ampdu[tid];
887 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
888 continue;
889 if (rap->rxa_qframes == 0)
890 continue;
891 /*
892 * Check for frames sitting too long in the reorder queue.
893 * See above for more details on what's happening here.
894 */
895 /* XXX honor batimeout? */
896 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
897 /*
898 * Too long since we received the first
899 * frame; flush the reorder buffer.
900 */
901 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
902 ampdu_rx_flush(ni, rap);
903 }
904 }
905#endif /* IEEE80211_AMPDU_AGE */
906}
907
908static struct ieee80211_channel *
909findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
910{
911 return ieee80211_find_channel(ic, c->ic_freq,
912 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
913}
914
915/*
916 * Adjust a channel to be HT/non-HT according to the vap's configuration.
917 */
918struct ieee80211_channel *
919ieee80211_ht_adjust_channel(struct ieee80211com *ic,
920 struct ieee80211_channel *chan, int flags)
921{
922 struct ieee80211_channel *c;
923
924 if (flags & IEEE80211_FHT_HT) {
925 /* promote to HT if possible */
926 if (flags & IEEE80211_FHT_USEHT40) {
927 if (!IEEE80211_IS_CHAN_HT40(chan)) {
928 /* NB: arbitrarily pick ht40+ over ht40- */
929 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
930 if (c == NULL)
931 c = findhtchan(ic, chan,
932 IEEE80211_CHAN_HT40D);
933 if (c == NULL)
934 c = findhtchan(ic, chan,
935 IEEE80211_CHAN_HT20);
936 if (c != NULL)
937 chan = c;
938 }
939 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
940 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
941 if (c != NULL)
942 chan = c;
943 }
944 } else if (IEEE80211_IS_CHAN_HT(chan)) {
945 /* demote to legacy, HT use is disabled */
946 c = ieee80211_find_channel(ic, chan->ic_freq,
947 chan->ic_flags &~ IEEE80211_CHAN_HT);
948 if (c != NULL)
949 chan = c;
950 }
951 return chan;
952}
953
954/*
955 * Setup HT-specific state for a legacy WDS peer.
956 */
957void
958ieee80211_ht_wds_init(struct ieee80211_node *ni)
959{
960 struct ieee80211vap *vap = ni->ni_vap;
961 struct ieee80211_tx_ampdu *tap;
962 int ac;
963
964 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
965
966 /* XXX check scan cache in case peer has an ap and we have info */
967 /*
968 * If setup with a legacy channel; locate an HT channel.
969 * Otherwise if the inherited channel (from a companion
970 * AP) is suitable use it so we use the same location
971 * for the extension channel).
972 */
973 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
974 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
975
976 ni->ni_htcap = 0;
977 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
978 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
979 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
980 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
981 ni->ni_chw = 40;
982 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
983 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
984 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
985 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
986 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
987 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
988 } else {
989 ni->ni_chw = 20;
990 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
991 }
992 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
993 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
994 ni->ni_flags |= IEEE80211_NODE_RIFS;
995 /* XXX does it make sense to enable SMPS? */
996
997 ni->ni_htopmode = 0; /* XXX need protection state */
998 ni->ni_htstbc = 0; /* XXX need info */
999
1000 for (ac = 0; ac < WME_NUM_AC; ac++) {
1001 tap = &ni->ni_tx_ampdu[ac];
1002 tap->txa_ac = ac;
1003 }
1004 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1005 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1006}
1007
1008/*
1009 * Notify hostap vaps of a change in the HTINFO ie.
1010 */
1011static void
1012htinfo_notify(struct ieee80211com *ic)
1013{
1014 struct ieee80211vap *vap;
1015 int first = 1;
1016
1017 IEEE80211_LOCK_ASSERT(ic);
1018
1019 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1020 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1021 continue;
1022 if (vap->iv_state != IEEE80211_S_RUN ||
1023 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1024 continue;
1025 if (first) {
1026 IEEE80211_NOTE(vap,
1027 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1028 vap->iv_bss,
1029 "HT bss occupancy change: %d sta, %d ht, "
1030 "%d ht40%s, HT protmode now 0x%x"
1031 , ic->ic_sta_assoc
1032 , ic->ic_ht_sta_assoc
1033 , ic->ic_ht40_sta_assoc
1034 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1035 ", non-HT sta present" : ""
1036 , ic->ic_curhtprotmode);
1037 first = 0;
1038 }
1039 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1040 }
1041}
1042
1043/*
1044 * Calculate HT protection mode from current
1045 * state and handle updates.
1046 */
1047static void
1048htinfo_update(struct ieee80211com *ic)
1049{
1050 uint8_t protmode;
1051
1052 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1053 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1054 | IEEE80211_HTINFO_NONHT_PRESENT;
1055 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1056 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1057 | IEEE80211_HTINFO_NONHT_PRESENT;
1058 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1059 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1060 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1061 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1062 } else {
1063 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1064 }
1065 if (protmode != ic->ic_curhtprotmode) {
1066 ic->ic_curhtprotmode = protmode;
1067 htinfo_notify(ic);
1068 }
1069}
1070
1071/*
1072 * Handle an HT station joining a BSS.
1073 */
1074void
1075ieee80211_ht_node_join(struct ieee80211_node *ni)
1076{
1077 struct ieee80211com *ic = ni->ni_ic;
1078
1079 IEEE80211_LOCK_ASSERT(ic);
1080
1081 if (ni->ni_flags & IEEE80211_NODE_HT) {
1082 ic->ic_ht_sta_assoc++;
1083 if (ni->ni_chw == 40)
1084 ic->ic_ht40_sta_assoc++;
1085 }
1086 htinfo_update(ic);
1087}
1088
1089/*
1090 * Handle an HT station leaving a BSS.
1091 */
1092void
1093ieee80211_ht_node_leave(struct ieee80211_node *ni)
1094{
1095 struct ieee80211com *ic = ni->ni_ic;
1096
1097 IEEE80211_LOCK_ASSERT(ic);
1098
1099 if (ni->ni_flags & IEEE80211_NODE_HT) {
1100 ic->ic_ht_sta_assoc--;
1101 if (ni->ni_chw == 40)
1102 ic->ic_ht40_sta_assoc--;
1103 }
1104 htinfo_update(ic);
1105}
1106
1107/*
1108 * Public version of htinfo_update; used for processing
1109 * beacon frames from overlapping bss.
1110 *
1111 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1112 * (on receipt of a beacon that advertises MIXED) or
1113 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1114 * from an overlapping legacy bss). We treat MIXED with
1115 * a higher precedence than PROTOPT (i.e. we will not change
1116 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1117 * corresponds to how we handle things in htinfo_update.
1118 */
1119void
1120ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1121{
1122#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1123 IEEE80211_LOCK(ic);
1124
1125 /* track non-HT station presence */
1126 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1127 ("protmode 0x%x", protmode));
1128 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1129 ic->ic_lastnonht = ticks;
1130
1131 if (protmode != ic->ic_curhtprotmode &&
1132 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1133 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1134 /* push beacon update */
1135 ic->ic_curhtprotmode = protmode;
1136 htinfo_notify(ic);
1137 }
1138 IEEE80211_UNLOCK(ic);
1139#undef OPMODE
1140}
1141
1142/*
1143 * Time out presence of an overlapping bss with non-HT
1144 * stations. When operating in hostap mode we listen for
1145 * beacons from other stations and if we identify a non-HT
1146 * station is present we update the opmode field of the
1147 * HTINFO ie. To identify when all non-HT stations are
1148 * gone we time out this condition.
1149 */
1150void
1151ieee80211_ht_timeout(struct ieee80211com *ic)
1152{
1153 IEEE80211_LOCK_ASSERT(ic);
1154
1155 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1156 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1157#if 0
1158 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1159 "%s", "time out non-HT STA present on channel");
1160#endif
1161 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1162 htinfo_update(ic);
1163 }
1164}
1165
1166/* unalligned little endian access */
1167#define LE_READ_2(p) \
1168 ((uint16_t) \
1169 ((((const uint8_t *)(p))[0] ) | \
1170 (((const uint8_t *)(p))[1] << 8)))
1171
1172/*
1173 * Process an 802.11n HT capabilities ie.
1174 */
1175void
1176ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1177{
1178 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1179 /*
1180 * Station used Vendor OUI ie to associate;
1181 * mark the node so when we respond we'll use
1182 * the Vendor OUI's and not the standard ie's.
1183 */
1184 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1185 ie += 4;
1186 } else
1187 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1188
1189 ni->ni_htcap = LE_READ_2(ie +
1190 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1191 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1192}
1193
1194static void
1195htinfo_parse(struct ieee80211_node *ni,
1196 const struct ieee80211_ie_htinfo *htinfo)
1197{
1198 uint16_t w;
1199
1200 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1201 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1202 w = LE_READ_2(&htinfo->hi_byte2);
1203 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1204 w = LE_READ_2(&htinfo->hi_byte45);
1205 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1206}
1207
1208/*
1209 * Parse an 802.11n HT info ie and save useful information
1210 * to the node state. Note this does not effect any state
1211 * changes such as for channel width change.
1212 */
1213void
1214ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1215{
1216 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1217 ie += 4;
1218 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1219}
1220
1221/*
1222 * Handle 11n channel switch. Use the received HT ie's to
1223 * identify the right channel to use. If we cannot locate it
1224 * in the channel table then fallback to legacy operation.
1225 * Note that we use this information to identify the node's
1226 * channel only; the caller is responsible for insuring any
1227 * required channel change is done (e.g. in sta mode when
1228 * parsing the contents of a beacon frame).
1229 */
1230static void
1231htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1232{
1233 struct ieee80211com *ic = ni->ni_ic;
1234 struct ieee80211_channel *c;
1235 int chanflags;
1236
1237 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1238 if (chanflags != ni->ni_chan->ic_flags) {
1239 /* XXX not right for ht40- */
1240 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1241 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1242 /*
1243 * No HT40 channel entry in our table; fall back
1244 * to HT20 operation. This should not happen.
1245 */
1246 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1247#if 0
1248 IEEE80211_NOTE(ni->ni_vap,
1249 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1250 "no HT40 channel (freq %u), falling back to HT20",
1251 ni->ni_chan->ic_freq);
1252#endif
1253 /* XXX stat */
1254 }
1255 if (c != NULL && c != ni->ni_chan) {
1256 IEEE80211_NOTE(ni->ni_vap,
1257 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1258 "switch station to HT%d channel %u/0x%x",
1259 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1260 c->ic_freq, c->ic_flags);
1261 ni->ni_chan = c;
1262 }
1263 /* NB: caller responsible for forcing any channel change */
1264 }
1265 /* update node's tx channel width */
1266 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1267}
1268
1269/*
1270 * Update 11n MIMO PS state according to received htcap.
1271 */
1272static __inline int
1273htcap_update_mimo_ps(struct ieee80211_node *ni)
1274{
1275 uint16_t oflags = ni->ni_flags;
1276
1277 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1278 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1279 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1280 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1281 break;
1282 case IEEE80211_HTCAP_SMPS_ENA:
1283 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1284 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1285 break;
1286 case IEEE80211_HTCAP_SMPS_OFF:
1287 default: /* disable on rx of reserved value */
1288 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1289 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1290 break;
1291 }
1292 return (oflags ^ ni->ni_flags);
1293}
1294
1295/*
1296 * Update short GI state according to received htcap
1297 * and local settings.
1298 */
1299static __inline void
1300htcap_update_shortgi(struct ieee80211_node *ni)
1301{
1302 struct ieee80211vap *vap = ni->ni_vap;
1303
1304 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1305 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1306 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1307 ni->ni_flags |= IEEE80211_NODE_SGI20;
1308 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1309 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1310 ni->ni_flags |= IEEE80211_NODE_SGI40;
1311}
1312
1313/*
1314 * Parse and update HT-related state extracted from
1315 * the HT cap and info ie's.
1316 */
1317void
1318ieee80211_ht_updateparams(struct ieee80211_node *ni,
1319 const uint8_t *htcapie, const uint8_t *htinfoie)
1320{
1321 struct ieee80211vap *vap = ni->ni_vap;
1322 const struct ieee80211_ie_htinfo *htinfo;
1323 int htflags;
1324
1325 ieee80211_parse_htcap(ni, htcapie);
1326 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1327 htcap_update_mimo_ps(ni);
1328 htcap_update_shortgi(ni);
1329
1330 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1331 htinfoie += 4;
1332 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1333 htinfo_parse(ni, htinfo);
1334
1335 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1336 IEEE80211_CHAN_HT20 : 0;
1337 /* NB: honor operating mode constraint */
1338 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1339 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1340 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1341 htflags = IEEE80211_CHAN_HT40U;
1342 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1343 htflags = IEEE80211_CHAN_HT40D;
1344 }
1345 htinfo_update_chw(ni, htflags);
1346
1347 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1348 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1349 ni->ni_flags |= IEEE80211_NODE_RIFS;
1350 else
1351 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1352}
1353
1354/*
1355 * Parse and update HT-related state extracted from the HT cap ie
1356 * for a station joining an HT BSS.
1357 */
1358void
1359ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1360{
1361 struct ieee80211vap *vap = ni->ni_vap;
1362 int htflags;
1363
1364 ieee80211_parse_htcap(ni, htcapie);
1365 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1366 htcap_update_mimo_ps(ni);
1367 htcap_update_shortgi(ni);
1368
1369 /* NB: honor operating mode constraint */
1370 /* XXX 40 MHZ intolerant */
1371 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1372 IEEE80211_CHAN_HT20 : 0;
1373 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1374 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1375 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1376 htflags = IEEE80211_CHAN_HT40U;
1377 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1378 htflags = IEEE80211_CHAN_HT40D;
1379 }
1380 htinfo_update_chw(ni, htflags);
1381}
1382
1383/*
1384 * Install received HT rate set by parsing the HT cap ie.
1385 */
1386int
1387ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1388{
1389 struct ieee80211vap *vap = ni->ni_vap;
1390 const struct ieee80211_ie_htcap *htcap;
1391 struct ieee80211_htrateset *rs;
1392 int i;
1393
1394 rs = &ni->ni_htrates;
1395 memset(rs, 0, sizeof(*rs));
1396 if (ie != NULL) {
1397 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1398 ie += 4;
1399 htcap = (const struct ieee80211_ie_htcap *) ie;
1400 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1401 if (isclr(htcap->hc_mcsset, i))
1402 continue;
1403 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1404 IEEE80211_NOTE(vap,
1405 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1406 "WARNING, HT rate set too large; only "
1407 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1408 vap->iv_stats.is_rx_rstoobig++;
1409 break;
1410 }
1411 rs->rs_rates[rs->rs_nrates++] = i;
1412 }
1413 }
1414 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1415}
1416
1417/*
1418 * Mark rates in a node's HT rate set as basic according
1419 * to the information in the supplied HT info ie.
1420 */
1421void
1422ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1423{
1424 const struct ieee80211_ie_htinfo *htinfo;
1425 struct ieee80211_htrateset *rs;
1426 int i, j;
1427
1428 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1429 ie += 4;
1430 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1431 rs = &ni->ni_htrates;
1432 if (rs->rs_nrates == 0) {
1433 IEEE80211_NOTE(ni->ni_vap,
1434 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1435 "%s", "WARNING, empty HT rate set");
1436 return;
1437 }
1438 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1439 if (isclr(htinfo->hi_basicmcsset, i))
1440 continue;
1441 for (j = 0; j < rs->rs_nrates; j++)
1442 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1443 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1444 }
1445}
1446
1447static void
1448ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1449{
1450 callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
1451 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1452}
1453
1454static void
1455ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1456{
1457 struct ieee80211_node *ni = tap->txa_ni;
1458 struct ieee80211com *ic = ni->ni_ic;
1459
1460 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1461 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
1462
1463 /*
1464 * Stop BA stream if setup so driver has a chance
1465 * to reclaim any resources it might have allocated.
1466 */
1467 ic->ic_addba_stop(ni, tap);
1468 /*
1469 * Stop any pending BAR transmit.
1470 */
1471 bar_stop_timer(tap);
1472
1473 tap->txa_lastsample = 0;
1474 tap->txa_avgpps = 0;
1475 /* NB: clearing NAK means we may re-send ADDBA */
1476 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1477}
1478
1479static void
1480addba_timeout(void *arg)
1481{
1482 struct ieee80211_tx_ampdu *tap = arg;
1483
1484 /* XXX ? */
1485 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1486 tap->txa_attempts++;
1487}
1488
1489static void
1490addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1491{
1492 /* XXX use CALLOUT_PENDING instead? */
1493 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1494 addba_timeout, tap);
1495 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1496 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1497}
1498
1499static void
1500addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1501{
1502 /* XXX use CALLOUT_PENDING instead? */
1503 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1504 callout_stop(&tap->txa_timer);
1505 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1506 }
1507}
1508
1509/*
1510 * Default method for requesting A-MPDU tx aggregation.
1511 * We setup the specified state block and start a timer
1512 * to wait for an ADDBA response frame.
1513 */
1514static int
1515ieee80211_addba_request(struct ieee80211_node *ni,
1516 struct ieee80211_tx_ampdu *tap,
1517 int dialogtoken, int baparamset, int batimeout)
1518{
1519 int bufsiz;
1520
1521 /* XXX locking */
1522 tap->txa_token = dialogtoken;
1523 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1524 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1525 tap->txa_wnd = (bufsiz == 0) ?
1526 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1527 addba_start_timeout(tap);
1528 return 1;
1529}
1530
1531/*
1532 * Default method for processing an A-MPDU tx aggregation
1533 * response. We shutdown any pending timer and update the
1534 * state block according to the reply.
1535 */
1536static int
1537ieee80211_addba_response(struct ieee80211_node *ni,
1538 struct ieee80211_tx_ampdu *tap,
1539 int status, int baparamset, int batimeout)
1540{
1541 int bufsiz, tid;
1542
1543 /* XXX locking */
1544 addba_stop_timeout(tap);
1545 if (status == IEEE80211_STATUS_SUCCESS) {
1546 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1547 /* XXX override our request? */
1548 tap->txa_wnd = (bufsiz == 0) ?
1549 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1550 /* XXX AC/TID */
1551 tid = MS(baparamset, IEEE80211_BAPS_TID);
1552 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1553 tap->txa_attempts = 0;
1554 } else {
1555 /* mark tid so we don't try again */
1556 tap->txa_flags |= IEEE80211_AGGR_NAK;
1557 }
1558 return 1;
1559}
1560
1561/*
1562 * Default method for stopping A-MPDU tx aggregation.
1563 * Any timer is cleared and we drain any pending frames.
1564 */
1565static void
1566ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1567{
1568 /* XXX locking */
1569 addba_stop_timeout(tap);
1570 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1571 /* XXX clear aggregation queue */
1572 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1573 }
1574 tap->txa_attempts = 0;
1575}
1576
1577/*
1578 * Process a received action frame using the default aggregation
1579 * policy. We intercept ADDBA-related frames and use them to
1580 * update our aggregation state. All other frames are passed up
1581 * for processing by ieee80211_recv_action.
1582 */
1583static void
1584ieee80211_aggr_recv_action(struct ieee80211_node *ni,
1585 const uint8_t *frm, const uint8_t *efrm)
1586{
1587 struct ieee80211com *ic = ni->ni_ic;
1588 struct ieee80211vap *vap = ni->ni_vap;
1589 const struct ieee80211_action *ia;
1590 struct ieee80211_rx_ampdu *rap;
1591 struct ieee80211_tx_ampdu *tap;
1592 uint8_t dialogtoken, policy;
1593 uint16_t baparamset, batimeout, baseqctl, code;
1594 uint16_t args[4];
1595 int tid, ac, bufsiz;
1596
1597 ia = (const struct ieee80211_action *) frm;
1598 switch (ia->ia_category) {
1599 case IEEE80211_ACTION_CAT_BA:
1600 switch (ia->ia_action) {
1601 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
1602 dialogtoken = frm[2];
1603 baparamset = LE_READ_2(frm+3);
1604 batimeout = LE_READ_2(frm+5);
1605 baseqctl = LE_READ_2(frm+7);
1606
1607 tid = MS(baparamset, IEEE80211_BAPS_TID);
1608
1609 IEEE80211_NOTE(vap,
1610 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1611 "recv ADDBA request: dialogtoken %u "
1612 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d "
1613 "baseqctl %d:%d",
1614 dialogtoken, baparamset,
1615 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1616 batimeout,
1617 MS(baseqctl, IEEE80211_BASEQ_START),
1618 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1619
1620 rap = &ni->ni_rx_ampdu[tid];
1621
1622 /* Send ADDBA response */
1623 args[0] = dialogtoken;
1624 /*
1625 * NB: We ack only if the sta associated with HT and
1626 * the ap is configured to do AMPDU rx (the latter
1627 * violates the 11n spec and is mostly for testing).
1628 */
1629 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1630 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1631 /* XXX handle ampdu_rx_start failure */
1632 ic->ic_ampdu_rx_start(ni, rap,
1633 baparamset, batimeout, baseqctl);
1634
1635 args[1] = IEEE80211_STATUS_SUCCESS;
1636 } else {
1637 IEEE80211_NOTE(vap,
1638 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1639 ni, "reject ADDBA request: %s",
1640 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1641 "administratively disabled" :
1642 "not negotiated for station");
1643 vap->iv_stats.is_addba_reject++;
1644 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1645 }
1646 /* XXX honor rap flags? */
1647 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1648 | SM(tid, IEEE80211_BAPS_TID)
1649 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1650 ;
1651 args[3] = 0;
1652 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1653 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1654 return;
1655
1656 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
1657 dialogtoken = frm[2];
1658 code = LE_READ_2(frm+3);
1659 baparamset = LE_READ_2(frm+5);
1660 tid = MS(baparamset, IEEE80211_BAPS_TID);
1661 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1662 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
1663 batimeout = LE_READ_2(frm+7);
1664
1665 ac = TID_TO_WME_AC(tid);
1666 tap = &ni->ni_tx_ampdu[ac];
1667 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1668 IEEE80211_DISCARD_MAC(vap,
1669 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1670 ni->ni_macaddr, "ADDBA response",
1671 "no pending ADDBA, tid %d dialogtoken %u "
1672 "code %d", tid, dialogtoken, code);
1673 vap->iv_stats.is_addba_norequest++;
1674 return;
1675 }
1676 if (dialogtoken != tap->txa_token) {
1677 IEEE80211_DISCARD_MAC(vap,
1678 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1679 ni->ni_macaddr, "ADDBA response",
1680 "dialogtoken mismatch: waiting for %d, "
1681 "received %d, tid %d code %d",
1682 tap->txa_token, dialogtoken, tid, code);
1683 vap->iv_stats.is_addba_badtoken++;
1684 return;
1685 }
1686 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
1687 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
1688 IEEE80211_DISCARD_MAC(vap,
1689 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1690 ni->ni_macaddr, "ADDBA response",
1691 "policy mismatch: expecting %s, "
1692 "received %s, tid %d code %d",
1693 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
1694 policy, tid, code);
1695 vap->iv_stats.is_addba_badpolicy++;
1696 return;
1697 }
1698#if 0
1699 /* XXX we take MIN in ieee80211_addba_response */
1700 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
1701 IEEE80211_DISCARD_MAC(vap,
1702 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1703 ni->ni_macaddr, "ADDBA response",
1704 "BA window too large: max %d, "
1705 "received %d, tid %d code %d",
1706 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
1707 vap->iv_stats.is_addba_badbawinsize++;
1708 return;
1709 }
1710#endif
1711 IEEE80211_NOTE(vap,
1712 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1713 "recv ADDBA response: dialogtoken %u code %d "
1714 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
1715 dialogtoken, code, baparamset, tid, bufsiz,
1716 batimeout);
1717 ic->ic_addba_response(ni, tap,
1718 code, baparamset, batimeout);
1719 return;
1720
1721 case IEEE80211_ACTION_BA_DELBA:
1722 baparamset = LE_READ_2(frm+2);
1723 code = LE_READ_2(frm+4);
1724
1725 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
1726
1727 IEEE80211_NOTE(vap,
1728 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1729 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
1730 "code %d", baparamset, tid,
1731 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
1732
1733 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
1734 ac = TID_TO_WME_AC(tid);
1735 tap = &ni->ni_tx_ampdu[ac];
1736 ic->ic_addba_stop(ni, tap);
1737 } else {
1738 rap = &ni->ni_rx_ampdu[tid];
1739 ic->ic_ampdu_rx_stop(ni, rap);
1740 }
1741 return;
1742 }
1743 break;
1744 }
1745 ieee80211_recv_action(ni, frm, efrm);
1746}
1747
1748/*
1749 * Process a received 802.11n action frame.
1750 * Aggregation-related frames are assumed to be handled
1751 * already; we handle any other frames we can, otherwise
1752 * complain about being unsupported (with debugging).
1753 */
1754void
1755ieee80211_recv_action(struct ieee80211_node *ni,
1756 const uint8_t *frm, const uint8_t *efrm)
1757{
1758 struct ieee80211vap *vap = ni->ni_vap;
1759 const struct ieee80211_action *ia;
1760 int chw;
1761
1762 ia = (const struct ieee80211_action *) frm;
1763 switch (ia->ia_category) {
1764 case IEEE80211_ACTION_CAT_BA:
1765 IEEE80211_NOTE(vap,
1766 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1767 "%s: BA action %d not implemented", __func__,
1768 ia->ia_action);
1769 vap->iv_stats.is_rx_mgtdiscard++;
1770 break;
1771 case IEEE80211_ACTION_CAT_HT:
1772 switch (ia->ia_action) {
1773 case IEEE80211_ACTION_HT_TXCHWIDTH:
1774 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20;
1775 IEEE80211_NOTE(vap,
1776 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1777 "%s: HT txchwidth, width %d%s",
1778 __func__, chw, ni->ni_chw != chw ? "*" : "");
1779 if (chw != ni->ni_chw) {
1780 ni->ni_chw = chw;
1781 /* XXX notify on change */
1782 }
1783 break;
1784 case IEEE80211_ACTION_HT_MIMOPWRSAVE: {
1785 const struct ieee80211_action_ht_mimopowersave *mps =
1786 (const struct ieee80211_action_ht_mimopowersave *) ia;
1787 /* XXX check iv_htcaps */
1788 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
1789 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1790 else
1791 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1792 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
1793 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1794 else
1795 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1796 /* XXX notify on change */
1797 IEEE80211_NOTE(vap,
1798 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1799 "%s: HT MIMO PS (%s%s)", __func__,
1800 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ?
1801 "on" : "off",
1802 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ?
1803 "+rts" : ""
1804 );
1805 break;
1806 }
1807 default:
1808 IEEE80211_NOTE(vap,
1809 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1810 "%s: HT action %d not implemented", __func__,
1811 ia->ia_action);
1812 vap->iv_stats.is_rx_mgtdiscard++;
1813 break;
1814 }
1815 break;
1816 default:
1817 IEEE80211_NOTE(vap,
1818 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1819 "%s: category %d not implemented", __func__,
1820 ia->ia_category);
1821 vap->iv_stats.is_rx_mgtdiscard++;
1822 break;
1823 }
1824}
1825
1826/*
1827 * Transmit processing.
1828 */
1829
1830/*
1831 * Check if A-MPDU should be requested/enabled for a stream.
1832 * We require a traffic rate above a per-AC threshold and we
1833 * also handle backoff from previous failed attempts.
1834 *
1835 * Drivers may override this method to bring in information
1836 * such as link state conditions in making the decision.
1837 */
1838static int
1839ieee80211_ampdu_enable(struct ieee80211_node *ni,
1840 struct ieee80211_tx_ampdu *tap)
1841{
1842 struct ieee80211vap *vap = ni->ni_vap;
1843
1844 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
1845 return 0;
1846 /* XXX check rssi? */
1847 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
1848 ticks < tap->txa_nextrequest) {
1849 /*
1850 * Don't retry too often; txa_nextrequest is set
1851 * to the minimum interval we'll retry after
1852 * ieee80211_addba_maxtries failed attempts are made.
1853 */
1854 return 0;
1855 }
1856 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1857 "enable AMPDU on %s, avgpps %d pkts %d",
1858 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
1859 return 1;
1860}
1861
1862/*
1863 * Request A-MPDU tx aggregation. Setup local state and
1864 * issue an ADDBA request. BA use will only happen after
1865 * the other end replies with ADDBA response.
1866 */
1867int
1868ieee80211_ampdu_request(struct ieee80211_node *ni,
1869 struct ieee80211_tx_ampdu *tap)
1870{
1871 struct ieee80211com *ic = ni->ni_ic;
1872 uint16_t args[4];
1873 int tid, dialogtoken;
1874 static int tokens = 0; /* XXX */
1875
1876 /* XXX locking */
1877 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
1878 /* do deferred setup of state */
1879 ampdu_tx_setup(tap);
1880 }
1881 /* XXX hack for not doing proper locking */
1882 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
1883
1884 dialogtoken = (tokens+1) % 63; /* XXX */
1885 tid = WME_AC_TO_TID(tap->txa_ac);
1886 tap->txa_start = ni->ni_txseqs[tid];
1887
1888 args[0] = dialogtoken;
1889 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE
1890 | SM(tid, IEEE80211_BAPS_TID)
1891 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
1892 ;
1893 args[2] = 0; /* batimeout */
1894 /* NB: do first so there's no race against reply */
1895 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) {
1896 /* unable to setup state, don't make request */
1897 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1898 ni, "%s: could not setup BA stream for AC %d",
1899 __func__, tap->txa_ac);
1900 /* defer next try so we don't slam the driver with requests */
1901 tap->txa_attempts = ieee80211_addba_maxtries;
1902 /* NB: check in case driver wants to override */
1903 if (tap->txa_nextrequest <= ticks)
1904 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
1905 return 0;
1906 }
1907 tokens = dialogtoken; /* allocate token */
1908 /* NB: after calling ic_addba_request so driver can set txa_start */
1909 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START)
1910 | SM(0, IEEE80211_BASEQ_FRAG)
1911 ;
1912 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1913 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
1914}
1915
1916/*
1917 * Terminate an AMPDU tx stream. State is reclaimed
1918 * and the peer notified with a DelBA Action frame.
1919 */
1920void
1921ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
1922 int reason)
1923{
1924 struct ieee80211com *ic = ni->ni_ic;
1925 struct ieee80211vap *vap = ni->ni_vap;
1926 uint16_t args[4];
1927
1928 /* XXX locking */
1929 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
1930 if (IEEE80211_AMPDU_RUNNING(tap)) {
1931 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1932 ni, "%s: stop BA stream for AC %d (reason %d)",
1933 __func__, tap->txa_ac, reason);
1934 vap->iv_stats.is_ampdu_stop++;
1935
1936 ic->ic_addba_stop(ni, tap);
1937 args[0] = WME_AC_TO_TID(tap->txa_ac);
1938 args[1] = IEEE80211_DELBAPS_INIT;
1939 args[2] = reason; /* XXX reason code */
1940 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA,
1941 IEEE80211_ACTION_BA_DELBA, args);
1942 } else {
1943 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1944 ni, "%s: BA stream for AC %d not running (reason %d)",
1945 __func__, tap->txa_ac, reason);
1946 vap->iv_stats.is_ampdu_stop_failed++;
1947 }
1948}
1949
1950static void
1951bar_timeout(void *arg)
1952{
1953 struct ieee80211_tx_ampdu *tap = arg;
1954 struct ieee80211_node *ni = tap->txa_ni;
1955
1956 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
1957 ("bar/addba collision, flags 0x%x", tap->txa_flags));
1958
1959 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1960 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
1961 tap->txa_ac, tap->txa_flags, tap->txa_attempts);
1962
1963 /* guard against race with bar_tx_complete */
1964 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
1965 return;
1966 /* XXX ? */
1967 if (tap->txa_attempts >= ieee80211_bar_maxtries)
1968 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
1969 else
1970 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
1971}
1972
1973static void
1974bar_start_timer(struct ieee80211_tx_ampdu *tap)
1975{
1976 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
1977}
1978
1979static void
1980bar_stop_timer(struct ieee80211_tx_ampdu *tap)
1981{
1982 callout_stop(&tap->txa_timer);
1983}
1984
1985static void
1986bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
1987{
1988 struct ieee80211_tx_ampdu *tap = arg;
1989
1990 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1991 ni, "%s: tid %u flags 0x%x pending %d status %d",
1992 __func__, tap->txa_ac, tap->txa_flags,
1993 callout_pending(&tap->txa_timer), status);
1994
1995 /* XXX locking */
1996 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
1997 callout_pending(&tap->txa_timer)) {
1998 struct ieee80211com *ic = ni->ni_ic;
1999
2000 if (status) /* ACK'd */
2001 bar_stop_timer(tap);
2002 ic->ic_bar_response(ni, tap, status);
2003 /* NB: just let timer expire so we pace requests */
2004 }
2005}
2006
2007static void
2008ieee80211_bar_response(struct ieee80211_node *ni,
2009 struct ieee80211_tx_ampdu *tap, int status)
2010{
2011
2012 if (status != 0) { /* got ACK */
2013 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2014 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2015 tap->txa_start,
2016 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2017 tap->txa_qframes, tap->txa_seqpending,
2018 WME_AC_TO_TID(tap->txa_ac));
2019
2020 /* NB: timer already stopped in bar_tx_complete */
2021 tap->txa_start = tap->txa_seqpending;
2022 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2023 }
2024}
2025
2026/*
2027 * Transmit a BAR frame to the specified node. The
2028 * BAR contents are drawn from the supplied aggregation
2029 * state associated with the node.
2030 *
2031 * NB: we only handle immediate ACK w/ compressed bitmap.
2032 */
2033int
2034ieee80211_send_bar(struct ieee80211_node *ni,
2035 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2036{
2037#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2038 struct ieee80211vap *vap = ni->ni_vap;
2039 struct ieee80211com *ic = ni->ni_ic;
2040 struct ieee80211_frame_bar *bar;
2041 struct mbuf *m;
2042 uint16_t barctl, barseqctl;
2043 uint8_t *frm;
2044 int tid, ret;
2045
2046 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2047 /* no ADDBA response, should not happen */
2048 /* XXX stat+msg */
2049 return EINVAL;
2050 }
2051 /* XXX locking */
2052 bar_stop_timer(tap);
2053
2054 ieee80211_ref_node(ni);
2055
2056 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2057 if (m == NULL)
2058 senderr(ENOMEM, is_tx_nobuf);
2059
2060 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2061 m_freem(m);
2062 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2063 /* NOTREACHED */
2064 }
2065
2066 bar = mtod(m, struct ieee80211_frame_bar *);
2067 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2068 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2069 bar->i_fc[1] = 0;
2070 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2071 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2072
2073 tid = WME_AC_TO_TID(tap->txa_ac);
2074 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2075 0 : IEEE80211_BAR_NOACK)
2076 | IEEE80211_BAR_COMP
2077 | SM(tid, IEEE80211_BAR_TID)
2078 ;
2079 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2080 /* NB: known to have proper alignment */
2081 bar->i_ctl = htole16(barctl);
2082 bar->i_seq = htole16(barseqctl);
2083 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2084
2085 M_WME_SETAC(m, WME_AC_VO);
2086
2087 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2088
2089 /* XXX locking */
2090 /* init/bump attempts counter */
2091 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2092 tap->txa_attempts = 1;
2093 else
2094 tap->txa_attempts++;
2095 tap->txa_seqpending = seq;
2096 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2097
2098 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2099 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2100 tid, barctl, seq, tap->txa_attempts);
2101
2102 ret = ic->ic_raw_xmit(ni, m, NULL);
2103 if (ret != 0) {
2104 /* xmit failed, clear state flag */
2105 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2106 goto bad;
2107 }
2108 /* XXX hack against tx complete happening before timer is started */
2109 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2110 bar_start_timer(tap);
2111 return 0;
2112bad:
2113 ieee80211_free_node(ni);
2114 return ret;
2115#undef senderr
2116}
2117
2118/*
2119 * Send an action management frame. The arguments are stuff
2120 * into a frame without inspection; the caller is assumed to
2121 * prepare them carefully (e.g. based on the aggregation state).
2122 */
2123int
2124ieee80211_send_action(struct ieee80211_node *ni,
2125 int category, int action, uint16_t args[4])
2126{
2127#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2128#define ADDSHORT(frm, v) do { \
2129 frm[0] = (v) & 0xff; \
2130 frm[1] = (v) >> 8; \
2131 frm += 2; \
2132} while (0)
2133 struct ieee80211vap *vap = ni->ni_vap;
2134 struct ieee80211com *ic = ni->ni_ic;
2135 struct ieee80211_bpf_params params;
2136 struct mbuf *m;
2137 uint8_t *frm;
2138 uint16_t baparamset;
2139 int ret;
2140
2141 KASSERT(ni != NULL, ("null node"));
2142
2143 /*
2144 * Hold a reference on the node so it doesn't go away until after
2145 * the xmit is complete all the way in the driver. On error we
2146 * will remove our reference.
2147 */
2148 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2149 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2150 __func__, __LINE__,
2151 ni, ether_sprintf(ni->ni_macaddr),
2152 ieee80211_node_refcnt(ni)+1);
2153 ieee80211_ref_node(ni);
2154
2155 m = ieee80211_getmgtframe(&frm,
2156 ic->ic_headroom + sizeof(struct ieee80211_frame),
2157 sizeof(uint16_t) /* action+category */
2158 /* XXX may action payload */
2159 + sizeof(struct ieee80211_action_ba_addbaresponse)
2160 );
2161 if (m == NULL)
2162 senderr(ENOMEM, is_tx_nobuf);
2163
2164 *frm++ = category;
2165 *frm++ = action;
2166 switch (category) {
2167 case IEEE80211_ACTION_CAT_BA:
2168 switch (action) {
2169 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
2170 IEEE80211_NOTE(vap,
2171 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2172 "send ADDBA request: dialogtoken %d "
2173 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2174 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID),
2175 args[2], args[3]);
2176
2177 *frm++ = args[0]; /* dialog token */
2178 ADDSHORT(frm, args[1]); /* baparamset */
2179 ADDSHORT(frm, args[2]); /* batimeout */
2180 ADDSHORT(frm, args[3]); /* baseqctl */
2181 break;
2182 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
2183 IEEE80211_NOTE(vap,
2184 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2185 "send ADDBA response: dialogtoken %d status %d "
2186 "baparamset 0x%x (tid %d) batimeout %d",
2187 args[0], args[1], args[2],
2188 MS(args[2], IEEE80211_BAPS_TID), args[3]);
2189
2190 *frm++ = args[0]; /* dialog token */
2191 ADDSHORT(frm, args[1]); /* statuscode */
2192 ADDSHORT(frm, args[2]); /* baparamset */
2193 ADDSHORT(frm, args[3]); /* batimeout */
2194 break;
2195 case IEEE80211_ACTION_BA_DELBA:
2196 /* XXX */
2197 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2198 | args[1]
2199 ;
2200 ADDSHORT(frm, baparamset);
2201 ADDSHORT(frm, args[2]); /* reason code */
2202
2203 IEEE80211_NOTE(vap,
2204 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2205 "send DELBA action: tid %d, initiator %d reason %d",
2206 args[0], args[1], args[2]);
2207 break;
2208 default:
2209 goto badaction;
2210 }
2211 break;
2212 case IEEE80211_ACTION_CAT_HT:
2213 switch (action) {
2214 case IEEE80211_ACTION_HT_TXCHWIDTH:
2215 IEEE80211_NOTE(vap,
2216 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2217 ni, "send HT txchwidth: width %d",
2218 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20
2219 );
2220 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2221 IEEE80211_A_HT_TXCHWIDTH_2040 :
2222 IEEE80211_A_HT_TXCHWIDTH_20;
2223 break;
2224 default:
2225 goto badaction;
2226 }
2227 break;
2228 default:
2229 badaction:
2230 IEEE80211_NOTE(vap,
2231 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2232 "%s: unsupported category %d action %d", __func__,
2233 category, action);
2234 senderr(EINVAL, is_tx_unknownmgt);
2235 /* NOTREACHED */
2236 }
2237 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2238
2239 memset(¶ms, 0, sizeof(params));
2240 params.ibp_pri = WME_AC_VO;
2241 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2242 /* NB: we know all frames are unicast */
2243 params.ibp_try0 = ni->ni_txparms->maxretry;
2244 params.ibp_power = ni->ni_txpower;
2245 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2246 ¶ms);
2247bad:
2248 ieee80211_free_node(ni);
2249 if (m != NULL)
2250 m_freem(m);
2251 return ret;
2252#undef ADDSHORT
2253#undef senderr
2254}
2255
2256/*
2257 * Construct the MCS bit mask for inclusion
2258 * in an HT information element.
2259 */
2260static void
2261ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2262{
2263 int i;
2264
2265 for (i = 0; i < rs->rs_nrates; i++) {
2266 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2267 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */
2268 /* NB: this assumes a particular implementation */
2269 setbit(frm, r);
2270 }
2271 }
2272}
2273
2274/*
2275 * Add body of an HTCAP information element.
2276 */
2277static uint8_t *
2278ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2279{
2280#define ADDSHORT(frm, v) do { \
2281 frm[0] = (v) & 0xff; \
2282 frm[1] = (v) >> 8; \
2283 frm += 2; \
2284} while (0)
2285 struct ieee80211vap *vap = ni->ni_vap;
2286 uint16_t caps;
2287 int rxmax, density;
2288
2289 /* HT capabilities */
2290 caps = vap->iv_htcaps & 0xffff;
2291 /*
2292 * Note channel width depends on whether we are operating as
2293 * a sta or not. When operating as a sta we are generating
2294 * a request based on our desired configuration. Otherwise
2295 * we are operational and the channel attributes identify
2296 * how we've been setup (which might be different if a fixed
2297 * channel is specified).
2298 */
2299 if (vap->iv_opmode == IEEE80211_M_STA) {
2300 /* override 20/40 use based on config */
2301 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2302 caps |= IEEE80211_HTCAP_CHWIDTH40;
2303 else
2304 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2305 /* use advertised setting (XXX locally constraint) */
2306 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2307 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2308 } else {
2309 /* override 20/40 use based on current channel */
2310 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2311 caps |= IEEE80211_HTCAP_CHWIDTH40;
2312 else
2313 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2314 rxmax = vap->iv_ampdu_rxmax;
2315 density = vap->iv_ampdu_density;
2316 }
2317 /* adjust short GI based on channel and config */
2318 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2319 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2320 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2321 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2322 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2323 ADDSHORT(frm, caps);
2324
2325 /* HT parameters */
2326 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2327 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2328 ;
2329 frm++;
2330
2331 /* pre-zero remainder of ie */
2332 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2333 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2334
2335 /* supported MCS set */
2336 /*
2337 * XXX it would better to get the rate set from ni_htrates
2338 * so we can restrict it but for sta mode ni_htrates isn't
2339 * setup when we're called to form an AssocReq frame so for
2340 * now we're restricted to the default HT rate set.
2341 */
2342 ieee80211_set_htrates(frm, &ieee80211_rateset_11n);
2343
2344 frm += sizeof(struct ieee80211_ie_htcap) -
2345 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2346 return frm;
2347#undef ADDSHORT
2348}
2349
2350/*
2351 * Add 802.11n HT capabilities information element
2352 */
2353uint8_t *
2354ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2355{
2356 frm[0] = IEEE80211_ELEMID_HTCAP;
2357 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2358 return ieee80211_add_htcap_body(frm + 2, ni);
2359}
2360
2361/*
2362 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2363 * used for compatibility w/ pre-draft implementations.
2364 */
2365uint8_t *
2366ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2367{
2368 frm[0] = IEEE80211_ELEMID_VENDOR;
2369 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2370 frm[2] = (BCM_OUI >> 0) & 0xff;
2371 frm[3] = (BCM_OUI >> 8) & 0xff;
2372 frm[4] = (BCM_OUI >> 16) & 0xff;
2373 frm[5] = BCM_OUI_HTCAP;
2374 return ieee80211_add_htcap_body(frm + 6, ni);
2375}
2376
2377/*
2378 * Construct the MCS bit mask of basic rates
2379 * for inclusion in an HT information element.
2380 */
2381static void
2382ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2383{
2384 int i;
2385
2386 for (i = 0; i < rs->rs_nrates; i++) {
2387 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2388 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2389 r < IEEE80211_HTRATE_MAXSIZE) {
2390 /* NB: this assumes a particular implementation */
2391 setbit(frm, r);
2392 }
2393 }
2394}
2395
2396/*
2397 * Update the HTINFO ie for a beacon frame.
2398 */
2399void
2400ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2401 struct ieee80211_beacon_offsets *bo)
2402{
2403#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2404 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
2405 struct ieee80211com *ic = vap->iv_ic;
2406 struct ieee80211_ie_htinfo *ht =
2407 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2408
2409 /* XXX only update on channel change */
2410 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2411 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2412 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2413 else
2414 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2415 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2416 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2417 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2418 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2419 else
2420 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2421 if (IEEE80211_IS_CHAN_HT40(bsschan))
2422 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2423
2424 /* protection mode */
2425 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2426
2427 /* XXX propagate to vendor ie's */
2428#undef PROTMODE
2429}
2430
2431/*
2432 * Add body of an HTINFO information element.
2433 *
2434 * NB: We don't use struct ieee80211_ie_htinfo because we can
2435 * be called to fillin both a standard ie and a compat ie that
2436 * has a vendor OUI at the front.
2437 */
2438static uint8_t *
2439ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2440{
2441 struct ieee80211vap *vap = ni->ni_vap;
2442 struct ieee80211com *ic = ni->ni_ic;
2443
2444 /* pre-zero remainder of ie */
2445 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2446
2447 /* primary/control channel center */
2448 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2449
2450 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2451 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2452 else
2453 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2454 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2455 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2456 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2457 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2458 else
2459 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2460 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2461 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2462
2463 frm[1] = ic->ic_curhtprotmode;
2464
2465 frm += 5;
2466
2467 /* basic MCS set */
2468 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2469 frm += sizeof(struct ieee80211_ie_htinfo) -
2470 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2471 return frm;
2472}
2473
2474/*
2475 * Add 802.11n HT information information element.
2476 */
2477uint8_t *
2478ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2479{
2480 frm[0] = IEEE80211_ELEMID_HTINFO;
2481 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2482 return ieee80211_add_htinfo_body(frm + 2, ni);
2483}
2484
2485/*
2486 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2487 * used for compatibility w/ pre-draft implementations.
2488 */
2489uint8_t *
2490ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2491{
2492 frm[0] = IEEE80211_ELEMID_VENDOR;
2493 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2494 frm[2] = (BCM_OUI >> 0) & 0xff;
2495 frm[3] = (BCM_OUI >> 8) & 0xff;
2496 frm[4] = (BCM_OUI >> 16) & 0xff;
2497 frm[5] = BCM_OUI_HTINFO;
2498 return ieee80211_add_htinfo_body(frm + 6, ni);
2499}
| 571 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
572 else
573 tid = wh->i_qos[0];
574 tid &= IEEE80211_QOS_TID;
575 rap = &ni->ni_rx_ampdu[tid];
576 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
577 /*
578 * No ADDBA request yet, don't touch.
579 */
580 return PROCESS;
581 }
582 rxseq = le16toh(*(uint16_t *)wh->i_seq);
583 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
584 /*
585 * Fragments are not allowed; toss.
586 */
587 IEEE80211_DISCARD_MAC(vap,
588 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
589 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
590 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
591 vap->iv_stats.is_ampdu_rx_drop++;
592 IEEE80211_NODE_STAT(ni, rx_drop);
593 m_freem(m);
594 return CONSUMED;
595 }
596 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
597 rap->rxa_nframes++;
598again:
599 if (rxseq == rap->rxa_start) {
600 /*
601 * First frame in window.
602 */
603 if (rap->rxa_qframes != 0) {
604 /*
605 * Dispatch as many packets as we can.
606 */
607 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
608 ampdu_dispatch(ni, m);
609 ampdu_rx_dispatch(rap, ni);
610 return CONSUMED;
611 } else {
612 /*
613 * In order; advance window and notify
614 * caller to dispatch directly.
615 */
616 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
617 return PROCESS;
618 }
619 }
620 /*
621 * Frame is out of order; store if in the BA window.
622 */
623 /* calculate offset in BA window */
624 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
625 if (off < rap->rxa_wnd) {
626 /*
627 * Common case (hopefully): in the BA window.
628 * Sec 9.10.7.6 a) (D2.04 p.118 line 47)
629 */
630#ifdef IEEE80211_AMPDU_AGE
631 /*
632 * Check for frames sitting too long in the reorder queue.
633 * This should only ever happen if frames are not delivered
634 * without the sender otherwise notifying us (e.g. with a
635 * BAR to move the window). Typically this happens because
636 * of vendor bugs that cause the sequence number to jump.
637 * When this happens we get a gap in the reorder queue that
638 * leaves frame sitting on the queue until they get pushed
639 * out due to window moves. When the vendor does not send
640 * BAR this move only happens due to explicit packet sends
641 *
642 * NB: we only track the time of the oldest frame in the
643 * reorder q; this means that if we flush we might push
644 * frames that still "new"; if this happens then subsequent
645 * frames will result in BA window moves which cost something
646 * but is still better than a big throughput dip.
647 */
648 if (rap->rxa_qframes != 0) {
649 /* XXX honor batimeout? */
650 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
651 /*
652 * Too long since we received the first
653 * frame; flush the reorder buffer.
654 */
655 if (rap->rxa_qframes != 0) {
656 vap->iv_stats.is_ampdu_rx_age +=
657 rap->rxa_qframes;
658 ampdu_rx_flush(ni, rap);
659 }
660 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
661 return PROCESS;
662 }
663 } else {
664 /*
665 * First frame, start aging timer.
666 */
667 rap->rxa_age = ticks;
668 }
669#endif /* IEEE80211_AMPDU_AGE */
670 /* save packet */
671 if (rap->rxa_m[off] == NULL) {
672 rap->rxa_m[off] = m;
673 rap->rxa_qframes++;
674 rap->rxa_qbytes += m->m_pkthdr.len;
675 vap->iv_stats.is_ampdu_rx_reorder++;
676 } else {
677 IEEE80211_DISCARD_MAC(vap,
678 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
679 ni->ni_macaddr, "a-mpdu duplicate",
680 "seqno %u tid %u BA win <%u:%u>",
681 rxseq, tid, rap->rxa_start,
682 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
683 vap->iv_stats.is_rx_dup++;
684 IEEE80211_NODE_STAT(ni, rx_dup);
685 m_freem(m);
686 }
687 return CONSUMED;
688 }
689 if (off < IEEE80211_SEQ_BA_RANGE) {
690 /*
691 * Outside the BA window, but within range;
692 * flush the reorder q and move the window.
693 * Sec 9.10.7.6 b) (D2.04 p.118 line 60)
694 */
695 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
696 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
697 rap->rxa_start,
698 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
699 rap->rxa_qframes, rxseq, tid);
700 vap->iv_stats.is_ampdu_rx_move++;
701
702 /*
703 * The spec says to flush frames up to but not including:
704 * WinStart_B = rxseq - rap->rxa_wnd + 1
705 * Then insert the frame or notify the caller to process
706 * it immediately. We can safely do this by just starting
707 * over again because we know the frame will now be within
708 * the BA window.
709 */
710 /* NB: rxa_wnd known to be >0 */
711 ampdu_rx_flush_upto(ni, rap,
712 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
713 goto again;
714 } else {
715 /*
716 * Outside the BA window and out of range; toss.
717 * Sec 9.10.7.6 c) (D2.04 p.119 line 16)
718 */
719 IEEE80211_DISCARD_MAC(vap,
720 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
721 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
722 rap->rxa_start,
723 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
724 rap->rxa_qframes, rxseq, tid,
725 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
726 vap->iv_stats.is_ampdu_rx_drop++;
727 IEEE80211_NODE_STAT(ni, rx_drop);
728 m_freem(m);
729 return CONSUMED;
730 }
731#undef CONSUMED
732#undef PROCESS
733#undef IEEE80211_FC0_QOSDATA
734}
735
736/*
737 * Process a BAR ctl frame. Dispatch all frames up to
738 * the sequence number of the frame. If this frame is
739 * out of range it's discarded.
740 */
741void
742ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
743{
744 struct ieee80211vap *vap = ni->ni_vap;
745 struct ieee80211_frame_bar *wh;
746 struct ieee80211_rx_ampdu *rap;
747 ieee80211_seq rxseq;
748 int tid, off;
749
750 if (!ieee80211_recv_bar_ena) {
751#if 0
752 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
753 ni->ni_macaddr, "BAR", "%s", "processing disabled");
754#endif
755 vap->iv_stats.is_ampdu_bar_bad++;
756 return;
757 }
758 wh = mtod(m0, struct ieee80211_frame_bar *);
759 /* XXX check basic BAR */
760 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
761 rap = &ni->ni_rx_ampdu[tid];
762 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
763 /*
764 * No ADDBA request yet, don't touch.
765 */
766 IEEE80211_DISCARD_MAC(vap,
767 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
768 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
769 vap->iv_stats.is_ampdu_bar_bad++;
770 return;
771 }
772 vap->iv_stats.is_ampdu_bar_rx++;
773 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
774 if (rxseq == rap->rxa_start)
775 return;
776 /* calculate offset in BA window */
777 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
778 if (off < IEEE80211_SEQ_BA_RANGE) {
779 /*
780 * Flush the reorder q up to rxseq and move the window.
781 * Sec 9.10.7.6 a) (D2.04 p.119 line 22)
782 */
783 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
784 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
785 rap->rxa_start,
786 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
787 rap->rxa_qframes, rxseq, tid);
788 vap->iv_stats.is_ampdu_bar_move++;
789
790 ampdu_rx_flush_upto(ni, rap, rxseq);
791 if (off >= rap->rxa_wnd) {
792 /*
793 * BAR specifies a window start to the right of BA
794 * window; we must move it explicitly since
795 * ampdu_rx_flush_upto will not.
796 */
797 rap->rxa_start = rxseq;
798 }
799 } else {
800 /*
801 * Out of range; toss.
802 * Sec 9.10.7.6 b) (D2.04 p.119 line 41)
803 */
804 IEEE80211_DISCARD_MAC(vap,
805 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
806 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
807 rap->rxa_start,
808 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
809 rap->rxa_qframes, rxseq, tid,
810 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
811 vap->iv_stats.is_ampdu_bar_oow++;
812 IEEE80211_NODE_STAT(ni, rx_drop);
813 }
814}
815
816/*
817 * Setup HT-specific state in a node. Called only
818 * when HT use is negotiated so we don't do extra
819 * work for temporary and/or legacy sta's.
820 */
821void
822ieee80211_ht_node_init(struct ieee80211_node *ni)
823{
824 struct ieee80211_tx_ampdu *tap;
825 int ac;
826
827 if (ni->ni_flags & IEEE80211_NODE_HT) {
828 /*
829 * Clean AMPDU state on re-associate. This handles the case
830 * where a station leaves w/o notifying us and then returns
831 * before node is reaped for inactivity.
832 */
833 ieee80211_ht_node_cleanup(ni);
834 }
835 for (ac = 0; ac < WME_NUM_AC; ac++) {
836 tap = &ni->ni_tx_ampdu[ac];
837 tap->txa_ac = ac;
838 tap->txa_ni = ni;
839 /* NB: further initialization deferred */
840 }
841 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
842}
843
844/*
845 * Cleanup HT-specific state in a node. Called only
846 * when HT use has been marked.
847 */
848void
849ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
850{
851 struct ieee80211com *ic = ni->ni_ic;
852 int i;
853
854 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
855
856 /* XXX optimize this */
857 for (i = 0; i < WME_NUM_AC; i++) {
858 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
859 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
860 ampdu_tx_stop(tap);
861 }
862 for (i = 0; i < WME_NUM_TID; i++)
863 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
864
865 ni->ni_htcap = 0;
866 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
867}
868
869/*
870 * Age out HT resources for a station.
871 */
872void
873ieee80211_ht_node_age(struct ieee80211_node *ni)
874{
875#ifdef IEEE80211_AMPDU_AGE
876 struct ieee80211vap *vap = ni->ni_vap;
877 uint8_t tid;
878#endif
879
880 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
881
882#ifdef IEEE80211_AMPDU_AGE
883 for (tid = 0; tid < WME_NUM_TID; tid++) {
884 struct ieee80211_rx_ampdu *rap;
885
886 rap = &ni->ni_rx_ampdu[tid];
887 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
888 continue;
889 if (rap->rxa_qframes == 0)
890 continue;
891 /*
892 * Check for frames sitting too long in the reorder queue.
893 * See above for more details on what's happening here.
894 */
895 /* XXX honor batimeout? */
896 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
897 /*
898 * Too long since we received the first
899 * frame; flush the reorder buffer.
900 */
901 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
902 ampdu_rx_flush(ni, rap);
903 }
904 }
905#endif /* IEEE80211_AMPDU_AGE */
906}
907
908static struct ieee80211_channel *
909findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
910{
911 return ieee80211_find_channel(ic, c->ic_freq,
912 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
913}
914
915/*
916 * Adjust a channel to be HT/non-HT according to the vap's configuration.
917 */
918struct ieee80211_channel *
919ieee80211_ht_adjust_channel(struct ieee80211com *ic,
920 struct ieee80211_channel *chan, int flags)
921{
922 struct ieee80211_channel *c;
923
924 if (flags & IEEE80211_FHT_HT) {
925 /* promote to HT if possible */
926 if (flags & IEEE80211_FHT_USEHT40) {
927 if (!IEEE80211_IS_CHAN_HT40(chan)) {
928 /* NB: arbitrarily pick ht40+ over ht40- */
929 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
930 if (c == NULL)
931 c = findhtchan(ic, chan,
932 IEEE80211_CHAN_HT40D);
933 if (c == NULL)
934 c = findhtchan(ic, chan,
935 IEEE80211_CHAN_HT20);
936 if (c != NULL)
937 chan = c;
938 }
939 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
940 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
941 if (c != NULL)
942 chan = c;
943 }
944 } else if (IEEE80211_IS_CHAN_HT(chan)) {
945 /* demote to legacy, HT use is disabled */
946 c = ieee80211_find_channel(ic, chan->ic_freq,
947 chan->ic_flags &~ IEEE80211_CHAN_HT);
948 if (c != NULL)
949 chan = c;
950 }
951 return chan;
952}
953
954/*
955 * Setup HT-specific state for a legacy WDS peer.
956 */
957void
958ieee80211_ht_wds_init(struct ieee80211_node *ni)
959{
960 struct ieee80211vap *vap = ni->ni_vap;
961 struct ieee80211_tx_ampdu *tap;
962 int ac;
963
964 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
965
966 /* XXX check scan cache in case peer has an ap and we have info */
967 /*
968 * If setup with a legacy channel; locate an HT channel.
969 * Otherwise if the inherited channel (from a companion
970 * AP) is suitable use it so we use the same location
971 * for the extension channel).
972 */
973 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
974 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
975
976 ni->ni_htcap = 0;
977 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
978 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
979 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
980 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
981 ni->ni_chw = 40;
982 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
983 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
984 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
985 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
986 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
987 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
988 } else {
989 ni->ni_chw = 20;
990 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
991 }
992 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
993 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
994 ni->ni_flags |= IEEE80211_NODE_RIFS;
995 /* XXX does it make sense to enable SMPS? */
996
997 ni->ni_htopmode = 0; /* XXX need protection state */
998 ni->ni_htstbc = 0; /* XXX need info */
999
1000 for (ac = 0; ac < WME_NUM_AC; ac++) {
1001 tap = &ni->ni_tx_ampdu[ac];
1002 tap->txa_ac = ac;
1003 }
1004 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1005 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1006}
1007
1008/*
1009 * Notify hostap vaps of a change in the HTINFO ie.
1010 */
1011static void
1012htinfo_notify(struct ieee80211com *ic)
1013{
1014 struct ieee80211vap *vap;
1015 int first = 1;
1016
1017 IEEE80211_LOCK_ASSERT(ic);
1018
1019 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1020 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1021 continue;
1022 if (vap->iv_state != IEEE80211_S_RUN ||
1023 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1024 continue;
1025 if (first) {
1026 IEEE80211_NOTE(vap,
1027 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1028 vap->iv_bss,
1029 "HT bss occupancy change: %d sta, %d ht, "
1030 "%d ht40%s, HT protmode now 0x%x"
1031 , ic->ic_sta_assoc
1032 , ic->ic_ht_sta_assoc
1033 , ic->ic_ht40_sta_assoc
1034 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1035 ", non-HT sta present" : ""
1036 , ic->ic_curhtprotmode);
1037 first = 0;
1038 }
1039 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1040 }
1041}
1042
1043/*
1044 * Calculate HT protection mode from current
1045 * state and handle updates.
1046 */
1047static void
1048htinfo_update(struct ieee80211com *ic)
1049{
1050 uint8_t protmode;
1051
1052 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1053 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1054 | IEEE80211_HTINFO_NONHT_PRESENT;
1055 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1056 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1057 | IEEE80211_HTINFO_NONHT_PRESENT;
1058 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1059 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1060 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1061 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1062 } else {
1063 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1064 }
1065 if (protmode != ic->ic_curhtprotmode) {
1066 ic->ic_curhtprotmode = protmode;
1067 htinfo_notify(ic);
1068 }
1069}
1070
1071/*
1072 * Handle an HT station joining a BSS.
1073 */
1074void
1075ieee80211_ht_node_join(struct ieee80211_node *ni)
1076{
1077 struct ieee80211com *ic = ni->ni_ic;
1078
1079 IEEE80211_LOCK_ASSERT(ic);
1080
1081 if (ni->ni_flags & IEEE80211_NODE_HT) {
1082 ic->ic_ht_sta_assoc++;
1083 if (ni->ni_chw == 40)
1084 ic->ic_ht40_sta_assoc++;
1085 }
1086 htinfo_update(ic);
1087}
1088
1089/*
1090 * Handle an HT station leaving a BSS.
1091 */
1092void
1093ieee80211_ht_node_leave(struct ieee80211_node *ni)
1094{
1095 struct ieee80211com *ic = ni->ni_ic;
1096
1097 IEEE80211_LOCK_ASSERT(ic);
1098
1099 if (ni->ni_flags & IEEE80211_NODE_HT) {
1100 ic->ic_ht_sta_assoc--;
1101 if (ni->ni_chw == 40)
1102 ic->ic_ht40_sta_assoc--;
1103 }
1104 htinfo_update(ic);
1105}
1106
1107/*
1108 * Public version of htinfo_update; used for processing
1109 * beacon frames from overlapping bss.
1110 *
1111 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1112 * (on receipt of a beacon that advertises MIXED) or
1113 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1114 * from an overlapping legacy bss). We treat MIXED with
1115 * a higher precedence than PROTOPT (i.e. we will not change
1116 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1117 * corresponds to how we handle things in htinfo_update.
1118 */
1119void
1120ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1121{
1122#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1123 IEEE80211_LOCK(ic);
1124
1125 /* track non-HT station presence */
1126 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1127 ("protmode 0x%x", protmode));
1128 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1129 ic->ic_lastnonht = ticks;
1130
1131 if (protmode != ic->ic_curhtprotmode &&
1132 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1133 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1134 /* push beacon update */
1135 ic->ic_curhtprotmode = protmode;
1136 htinfo_notify(ic);
1137 }
1138 IEEE80211_UNLOCK(ic);
1139#undef OPMODE
1140}
1141
1142/*
1143 * Time out presence of an overlapping bss with non-HT
1144 * stations. When operating in hostap mode we listen for
1145 * beacons from other stations and if we identify a non-HT
1146 * station is present we update the opmode field of the
1147 * HTINFO ie. To identify when all non-HT stations are
1148 * gone we time out this condition.
1149 */
1150void
1151ieee80211_ht_timeout(struct ieee80211com *ic)
1152{
1153 IEEE80211_LOCK_ASSERT(ic);
1154
1155 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1156 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1157#if 0
1158 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1159 "%s", "time out non-HT STA present on channel");
1160#endif
1161 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1162 htinfo_update(ic);
1163 }
1164}
1165
1166/* unalligned little endian access */
1167#define LE_READ_2(p) \
1168 ((uint16_t) \
1169 ((((const uint8_t *)(p))[0] ) | \
1170 (((const uint8_t *)(p))[1] << 8)))
1171
1172/*
1173 * Process an 802.11n HT capabilities ie.
1174 */
1175void
1176ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1177{
1178 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1179 /*
1180 * Station used Vendor OUI ie to associate;
1181 * mark the node so when we respond we'll use
1182 * the Vendor OUI's and not the standard ie's.
1183 */
1184 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1185 ie += 4;
1186 } else
1187 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1188
1189 ni->ni_htcap = LE_READ_2(ie +
1190 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1191 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1192}
1193
1194static void
1195htinfo_parse(struct ieee80211_node *ni,
1196 const struct ieee80211_ie_htinfo *htinfo)
1197{
1198 uint16_t w;
1199
1200 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1201 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1202 w = LE_READ_2(&htinfo->hi_byte2);
1203 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1204 w = LE_READ_2(&htinfo->hi_byte45);
1205 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1206}
1207
1208/*
1209 * Parse an 802.11n HT info ie and save useful information
1210 * to the node state. Note this does not effect any state
1211 * changes such as for channel width change.
1212 */
1213void
1214ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1215{
1216 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1217 ie += 4;
1218 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1219}
1220
1221/*
1222 * Handle 11n channel switch. Use the received HT ie's to
1223 * identify the right channel to use. If we cannot locate it
1224 * in the channel table then fallback to legacy operation.
1225 * Note that we use this information to identify the node's
1226 * channel only; the caller is responsible for insuring any
1227 * required channel change is done (e.g. in sta mode when
1228 * parsing the contents of a beacon frame).
1229 */
1230static void
1231htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1232{
1233 struct ieee80211com *ic = ni->ni_ic;
1234 struct ieee80211_channel *c;
1235 int chanflags;
1236
1237 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1238 if (chanflags != ni->ni_chan->ic_flags) {
1239 /* XXX not right for ht40- */
1240 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1241 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1242 /*
1243 * No HT40 channel entry in our table; fall back
1244 * to HT20 operation. This should not happen.
1245 */
1246 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1247#if 0
1248 IEEE80211_NOTE(ni->ni_vap,
1249 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1250 "no HT40 channel (freq %u), falling back to HT20",
1251 ni->ni_chan->ic_freq);
1252#endif
1253 /* XXX stat */
1254 }
1255 if (c != NULL && c != ni->ni_chan) {
1256 IEEE80211_NOTE(ni->ni_vap,
1257 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1258 "switch station to HT%d channel %u/0x%x",
1259 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1260 c->ic_freq, c->ic_flags);
1261 ni->ni_chan = c;
1262 }
1263 /* NB: caller responsible for forcing any channel change */
1264 }
1265 /* update node's tx channel width */
1266 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1267}
1268
1269/*
1270 * Update 11n MIMO PS state according to received htcap.
1271 */
1272static __inline int
1273htcap_update_mimo_ps(struct ieee80211_node *ni)
1274{
1275 uint16_t oflags = ni->ni_flags;
1276
1277 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1278 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1279 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1280 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1281 break;
1282 case IEEE80211_HTCAP_SMPS_ENA:
1283 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1284 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1285 break;
1286 case IEEE80211_HTCAP_SMPS_OFF:
1287 default: /* disable on rx of reserved value */
1288 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1289 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1290 break;
1291 }
1292 return (oflags ^ ni->ni_flags);
1293}
1294
1295/*
1296 * Update short GI state according to received htcap
1297 * and local settings.
1298 */
1299static __inline void
1300htcap_update_shortgi(struct ieee80211_node *ni)
1301{
1302 struct ieee80211vap *vap = ni->ni_vap;
1303
1304 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1305 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1306 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1307 ni->ni_flags |= IEEE80211_NODE_SGI20;
1308 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1309 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1310 ni->ni_flags |= IEEE80211_NODE_SGI40;
1311}
1312
1313/*
1314 * Parse and update HT-related state extracted from
1315 * the HT cap and info ie's.
1316 */
1317void
1318ieee80211_ht_updateparams(struct ieee80211_node *ni,
1319 const uint8_t *htcapie, const uint8_t *htinfoie)
1320{
1321 struct ieee80211vap *vap = ni->ni_vap;
1322 const struct ieee80211_ie_htinfo *htinfo;
1323 int htflags;
1324
1325 ieee80211_parse_htcap(ni, htcapie);
1326 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1327 htcap_update_mimo_ps(ni);
1328 htcap_update_shortgi(ni);
1329
1330 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1331 htinfoie += 4;
1332 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1333 htinfo_parse(ni, htinfo);
1334
1335 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1336 IEEE80211_CHAN_HT20 : 0;
1337 /* NB: honor operating mode constraint */
1338 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1339 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1340 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1341 htflags = IEEE80211_CHAN_HT40U;
1342 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1343 htflags = IEEE80211_CHAN_HT40D;
1344 }
1345 htinfo_update_chw(ni, htflags);
1346
1347 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1348 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1349 ni->ni_flags |= IEEE80211_NODE_RIFS;
1350 else
1351 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1352}
1353
1354/*
1355 * Parse and update HT-related state extracted from the HT cap ie
1356 * for a station joining an HT BSS.
1357 */
1358void
1359ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1360{
1361 struct ieee80211vap *vap = ni->ni_vap;
1362 int htflags;
1363
1364 ieee80211_parse_htcap(ni, htcapie);
1365 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1366 htcap_update_mimo_ps(ni);
1367 htcap_update_shortgi(ni);
1368
1369 /* NB: honor operating mode constraint */
1370 /* XXX 40 MHZ intolerant */
1371 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1372 IEEE80211_CHAN_HT20 : 0;
1373 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1374 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1375 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1376 htflags = IEEE80211_CHAN_HT40U;
1377 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1378 htflags = IEEE80211_CHAN_HT40D;
1379 }
1380 htinfo_update_chw(ni, htflags);
1381}
1382
1383/*
1384 * Install received HT rate set by parsing the HT cap ie.
1385 */
1386int
1387ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1388{
1389 struct ieee80211vap *vap = ni->ni_vap;
1390 const struct ieee80211_ie_htcap *htcap;
1391 struct ieee80211_htrateset *rs;
1392 int i;
1393
1394 rs = &ni->ni_htrates;
1395 memset(rs, 0, sizeof(*rs));
1396 if (ie != NULL) {
1397 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1398 ie += 4;
1399 htcap = (const struct ieee80211_ie_htcap *) ie;
1400 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1401 if (isclr(htcap->hc_mcsset, i))
1402 continue;
1403 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1404 IEEE80211_NOTE(vap,
1405 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1406 "WARNING, HT rate set too large; only "
1407 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1408 vap->iv_stats.is_rx_rstoobig++;
1409 break;
1410 }
1411 rs->rs_rates[rs->rs_nrates++] = i;
1412 }
1413 }
1414 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1415}
1416
1417/*
1418 * Mark rates in a node's HT rate set as basic according
1419 * to the information in the supplied HT info ie.
1420 */
1421void
1422ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1423{
1424 const struct ieee80211_ie_htinfo *htinfo;
1425 struct ieee80211_htrateset *rs;
1426 int i, j;
1427
1428 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1429 ie += 4;
1430 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1431 rs = &ni->ni_htrates;
1432 if (rs->rs_nrates == 0) {
1433 IEEE80211_NOTE(ni->ni_vap,
1434 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1435 "%s", "WARNING, empty HT rate set");
1436 return;
1437 }
1438 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1439 if (isclr(htinfo->hi_basicmcsset, i))
1440 continue;
1441 for (j = 0; j < rs->rs_nrates; j++)
1442 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1443 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1444 }
1445}
1446
1447static void
1448ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1449{
1450 callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
1451 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1452}
1453
1454static void
1455ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1456{
1457 struct ieee80211_node *ni = tap->txa_ni;
1458 struct ieee80211com *ic = ni->ni_ic;
1459
1460 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1461 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
1462
1463 /*
1464 * Stop BA stream if setup so driver has a chance
1465 * to reclaim any resources it might have allocated.
1466 */
1467 ic->ic_addba_stop(ni, tap);
1468 /*
1469 * Stop any pending BAR transmit.
1470 */
1471 bar_stop_timer(tap);
1472
1473 tap->txa_lastsample = 0;
1474 tap->txa_avgpps = 0;
1475 /* NB: clearing NAK means we may re-send ADDBA */
1476 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1477}
1478
1479static void
1480addba_timeout(void *arg)
1481{
1482 struct ieee80211_tx_ampdu *tap = arg;
1483
1484 /* XXX ? */
1485 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1486 tap->txa_attempts++;
1487}
1488
1489static void
1490addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1491{
1492 /* XXX use CALLOUT_PENDING instead? */
1493 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1494 addba_timeout, tap);
1495 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1496 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1497}
1498
1499static void
1500addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1501{
1502 /* XXX use CALLOUT_PENDING instead? */
1503 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1504 callout_stop(&tap->txa_timer);
1505 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1506 }
1507}
1508
1509/*
1510 * Default method for requesting A-MPDU tx aggregation.
1511 * We setup the specified state block and start a timer
1512 * to wait for an ADDBA response frame.
1513 */
1514static int
1515ieee80211_addba_request(struct ieee80211_node *ni,
1516 struct ieee80211_tx_ampdu *tap,
1517 int dialogtoken, int baparamset, int batimeout)
1518{
1519 int bufsiz;
1520
1521 /* XXX locking */
1522 tap->txa_token = dialogtoken;
1523 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1524 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1525 tap->txa_wnd = (bufsiz == 0) ?
1526 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1527 addba_start_timeout(tap);
1528 return 1;
1529}
1530
1531/*
1532 * Default method for processing an A-MPDU tx aggregation
1533 * response. We shutdown any pending timer and update the
1534 * state block according to the reply.
1535 */
1536static int
1537ieee80211_addba_response(struct ieee80211_node *ni,
1538 struct ieee80211_tx_ampdu *tap,
1539 int status, int baparamset, int batimeout)
1540{
1541 int bufsiz, tid;
1542
1543 /* XXX locking */
1544 addba_stop_timeout(tap);
1545 if (status == IEEE80211_STATUS_SUCCESS) {
1546 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1547 /* XXX override our request? */
1548 tap->txa_wnd = (bufsiz == 0) ?
1549 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1550 /* XXX AC/TID */
1551 tid = MS(baparamset, IEEE80211_BAPS_TID);
1552 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1553 tap->txa_attempts = 0;
1554 } else {
1555 /* mark tid so we don't try again */
1556 tap->txa_flags |= IEEE80211_AGGR_NAK;
1557 }
1558 return 1;
1559}
1560
1561/*
1562 * Default method for stopping A-MPDU tx aggregation.
1563 * Any timer is cleared and we drain any pending frames.
1564 */
1565static void
1566ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1567{
1568 /* XXX locking */
1569 addba_stop_timeout(tap);
1570 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1571 /* XXX clear aggregation queue */
1572 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1573 }
1574 tap->txa_attempts = 0;
1575}
1576
1577/*
1578 * Process a received action frame using the default aggregation
1579 * policy. We intercept ADDBA-related frames and use them to
1580 * update our aggregation state. All other frames are passed up
1581 * for processing by ieee80211_recv_action.
1582 */
1583static void
1584ieee80211_aggr_recv_action(struct ieee80211_node *ni,
1585 const uint8_t *frm, const uint8_t *efrm)
1586{
1587 struct ieee80211com *ic = ni->ni_ic;
1588 struct ieee80211vap *vap = ni->ni_vap;
1589 const struct ieee80211_action *ia;
1590 struct ieee80211_rx_ampdu *rap;
1591 struct ieee80211_tx_ampdu *tap;
1592 uint8_t dialogtoken, policy;
1593 uint16_t baparamset, batimeout, baseqctl, code;
1594 uint16_t args[4];
1595 int tid, ac, bufsiz;
1596
1597 ia = (const struct ieee80211_action *) frm;
1598 switch (ia->ia_category) {
1599 case IEEE80211_ACTION_CAT_BA:
1600 switch (ia->ia_action) {
1601 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
1602 dialogtoken = frm[2];
1603 baparamset = LE_READ_2(frm+3);
1604 batimeout = LE_READ_2(frm+5);
1605 baseqctl = LE_READ_2(frm+7);
1606
1607 tid = MS(baparamset, IEEE80211_BAPS_TID);
1608
1609 IEEE80211_NOTE(vap,
1610 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1611 "recv ADDBA request: dialogtoken %u "
1612 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d "
1613 "baseqctl %d:%d",
1614 dialogtoken, baparamset,
1615 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1616 batimeout,
1617 MS(baseqctl, IEEE80211_BASEQ_START),
1618 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1619
1620 rap = &ni->ni_rx_ampdu[tid];
1621
1622 /* Send ADDBA response */
1623 args[0] = dialogtoken;
1624 /*
1625 * NB: We ack only if the sta associated with HT and
1626 * the ap is configured to do AMPDU rx (the latter
1627 * violates the 11n spec and is mostly for testing).
1628 */
1629 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1630 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1631 /* XXX handle ampdu_rx_start failure */
1632 ic->ic_ampdu_rx_start(ni, rap,
1633 baparamset, batimeout, baseqctl);
1634
1635 args[1] = IEEE80211_STATUS_SUCCESS;
1636 } else {
1637 IEEE80211_NOTE(vap,
1638 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1639 ni, "reject ADDBA request: %s",
1640 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1641 "administratively disabled" :
1642 "not negotiated for station");
1643 vap->iv_stats.is_addba_reject++;
1644 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1645 }
1646 /* XXX honor rap flags? */
1647 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1648 | SM(tid, IEEE80211_BAPS_TID)
1649 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1650 ;
1651 args[3] = 0;
1652 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1653 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1654 return;
1655
1656 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
1657 dialogtoken = frm[2];
1658 code = LE_READ_2(frm+3);
1659 baparamset = LE_READ_2(frm+5);
1660 tid = MS(baparamset, IEEE80211_BAPS_TID);
1661 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1662 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
1663 batimeout = LE_READ_2(frm+7);
1664
1665 ac = TID_TO_WME_AC(tid);
1666 tap = &ni->ni_tx_ampdu[ac];
1667 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1668 IEEE80211_DISCARD_MAC(vap,
1669 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1670 ni->ni_macaddr, "ADDBA response",
1671 "no pending ADDBA, tid %d dialogtoken %u "
1672 "code %d", tid, dialogtoken, code);
1673 vap->iv_stats.is_addba_norequest++;
1674 return;
1675 }
1676 if (dialogtoken != tap->txa_token) {
1677 IEEE80211_DISCARD_MAC(vap,
1678 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1679 ni->ni_macaddr, "ADDBA response",
1680 "dialogtoken mismatch: waiting for %d, "
1681 "received %d, tid %d code %d",
1682 tap->txa_token, dialogtoken, tid, code);
1683 vap->iv_stats.is_addba_badtoken++;
1684 return;
1685 }
1686 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
1687 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
1688 IEEE80211_DISCARD_MAC(vap,
1689 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1690 ni->ni_macaddr, "ADDBA response",
1691 "policy mismatch: expecting %s, "
1692 "received %s, tid %d code %d",
1693 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
1694 policy, tid, code);
1695 vap->iv_stats.is_addba_badpolicy++;
1696 return;
1697 }
1698#if 0
1699 /* XXX we take MIN in ieee80211_addba_response */
1700 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
1701 IEEE80211_DISCARD_MAC(vap,
1702 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1703 ni->ni_macaddr, "ADDBA response",
1704 "BA window too large: max %d, "
1705 "received %d, tid %d code %d",
1706 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
1707 vap->iv_stats.is_addba_badbawinsize++;
1708 return;
1709 }
1710#endif
1711 IEEE80211_NOTE(vap,
1712 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1713 "recv ADDBA response: dialogtoken %u code %d "
1714 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
1715 dialogtoken, code, baparamset, tid, bufsiz,
1716 batimeout);
1717 ic->ic_addba_response(ni, tap,
1718 code, baparamset, batimeout);
1719 return;
1720
1721 case IEEE80211_ACTION_BA_DELBA:
1722 baparamset = LE_READ_2(frm+2);
1723 code = LE_READ_2(frm+4);
1724
1725 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
1726
1727 IEEE80211_NOTE(vap,
1728 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1729 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
1730 "code %d", baparamset, tid,
1731 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
1732
1733 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
1734 ac = TID_TO_WME_AC(tid);
1735 tap = &ni->ni_tx_ampdu[ac];
1736 ic->ic_addba_stop(ni, tap);
1737 } else {
1738 rap = &ni->ni_rx_ampdu[tid];
1739 ic->ic_ampdu_rx_stop(ni, rap);
1740 }
1741 return;
1742 }
1743 break;
1744 }
1745 ieee80211_recv_action(ni, frm, efrm);
1746}
1747
1748/*
1749 * Process a received 802.11n action frame.
1750 * Aggregation-related frames are assumed to be handled
1751 * already; we handle any other frames we can, otherwise
1752 * complain about being unsupported (with debugging).
1753 */
1754void
1755ieee80211_recv_action(struct ieee80211_node *ni,
1756 const uint8_t *frm, const uint8_t *efrm)
1757{
1758 struct ieee80211vap *vap = ni->ni_vap;
1759 const struct ieee80211_action *ia;
1760 int chw;
1761
1762 ia = (const struct ieee80211_action *) frm;
1763 switch (ia->ia_category) {
1764 case IEEE80211_ACTION_CAT_BA:
1765 IEEE80211_NOTE(vap,
1766 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1767 "%s: BA action %d not implemented", __func__,
1768 ia->ia_action);
1769 vap->iv_stats.is_rx_mgtdiscard++;
1770 break;
1771 case IEEE80211_ACTION_CAT_HT:
1772 switch (ia->ia_action) {
1773 case IEEE80211_ACTION_HT_TXCHWIDTH:
1774 chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20;
1775 IEEE80211_NOTE(vap,
1776 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1777 "%s: HT txchwidth, width %d%s",
1778 __func__, chw, ni->ni_chw != chw ? "*" : "");
1779 if (chw != ni->ni_chw) {
1780 ni->ni_chw = chw;
1781 /* XXX notify on change */
1782 }
1783 break;
1784 case IEEE80211_ACTION_HT_MIMOPWRSAVE: {
1785 const struct ieee80211_action_ht_mimopowersave *mps =
1786 (const struct ieee80211_action_ht_mimopowersave *) ia;
1787 /* XXX check iv_htcaps */
1788 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
1789 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1790 else
1791 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1792 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
1793 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1794 else
1795 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1796 /* XXX notify on change */
1797 IEEE80211_NOTE(vap,
1798 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1799 "%s: HT MIMO PS (%s%s)", __func__,
1800 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ?
1801 "on" : "off",
1802 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ?
1803 "+rts" : ""
1804 );
1805 break;
1806 }
1807 default:
1808 IEEE80211_NOTE(vap,
1809 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1810 "%s: HT action %d not implemented", __func__,
1811 ia->ia_action);
1812 vap->iv_stats.is_rx_mgtdiscard++;
1813 break;
1814 }
1815 break;
1816 default:
1817 IEEE80211_NOTE(vap,
1818 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1819 "%s: category %d not implemented", __func__,
1820 ia->ia_category);
1821 vap->iv_stats.is_rx_mgtdiscard++;
1822 break;
1823 }
1824}
1825
1826/*
1827 * Transmit processing.
1828 */
1829
1830/*
1831 * Check if A-MPDU should be requested/enabled for a stream.
1832 * We require a traffic rate above a per-AC threshold and we
1833 * also handle backoff from previous failed attempts.
1834 *
1835 * Drivers may override this method to bring in information
1836 * such as link state conditions in making the decision.
1837 */
1838static int
1839ieee80211_ampdu_enable(struct ieee80211_node *ni,
1840 struct ieee80211_tx_ampdu *tap)
1841{
1842 struct ieee80211vap *vap = ni->ni_vap;
1843
1844 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
1845 return 0;
1846 /* XXX check rssi? */
1847 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
1848 ticks < tap->txa_nextrequest) {
1849 /*
1850 * Don't retry too often; txa_nextrequest is set
1851 * to the minimum interval we'll retry after
1852 * ieee80211_addba_maxtries failed attempts are made.
1853 */
1854 return 0;
1855 }
1856 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1857 "enable AMPDU on %s, avgpps %d pkts %d",
1858 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
1859 return 1;
1860}
1861
1862/*
1863 * Request A-MPDU tx aggregation. Setup local state and
1864 * issue an ADDBA request. BA use will only happen after
1865 * the other end replies with ADDBA response.
1866 */
1867int
1868ieee80211_ampdu_request(struct ieee80211_node *ni,
1869 struct ieee80211_tx_ampdu *tap)
1870{
1871 struct ieee80211com *ic = ni->ni_ic;
1872 uint16_t args[4];
1873 int tid, dialogtoken;
1874 static int tokens = 0; /* XXX */
1875
1876 /* XXX locking */
1877 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
1878 /* do deferred setup of state */
1879 ampdu_tx_setup(tap);
1880 }
1881 /* XXX hack for not doing proper locking */
1882 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
1883
1884 dialogtoken = (tokens+1) % 63; /* XXX */
1885 tid = WME_AC_TO_TID(tap->txa_ac);
1886 tap->txa_start = ni->ni_txseqs[tid];
1887
1888 args[0] = dialogtoken;
1889 args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE
1890 | SM(tid, IEEE80211_BAPS_TID)
1891 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
1892 ;
1893 args[2] = 0; /* batimeout */
1894 /* NB: do first so there's no race against reply */
1895 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) {
1896 /* unable to setup state, don't make request */
1897 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1898 ni, "%s: could not setup BA stream for AC %d",
1899 __func__, tap->txa_ac);
1900 /* defer next try so we don't slam the driver with requests */
1901 tap->txa_attempts = ieee80211_addba_maxtries;
1902 /* NB: check in case driver wants to override */
1903 if (tap->txa_nextrequest <= ticks)
1904 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
1905 return 0;
1906 }
1907 tokens = dialogtoken; /* allocate token */
1908 /* NB: after calling ic_addba_request so driver can set txa_start */
1909 args[3] = SM(tap->txa_start, IEEE80211_BASEQ_START)
1910 | SM(0, IEEE80211_BASEQ_FRAG)
1911 ;
1912 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1913 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
1914}
1915
1916/*
1917 * Terminate an AMPDU tx stream. State is reclaimed
1918 * and the peer notified with a DelBA Action frame.
1919 */
1920void
1921ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
1922 int reason)
1923{
1924 struct ieee80211com *ic = ni->ni_ic;
1925 struct ieee80211vap *vap = ni->ni_vap;
1926 uint16_t args[4];
1927
1928 /* XXX locking */
1929 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
1930 if (IEEE80211_AMPDU_RUNNING(tap)) {
1931 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1932 ni, "%s: stop BA stream for AC %d (reason %d)",
1933 __func__, tap->txa_ac, reason);
1934 vap->iv_stats.is_ampdu_stop++;
1935
1936 ic->ic_addba_stop(ni, tap);
1937 args[0] = WME_AC_TO_TID(tap->txa_ac);
1938 args[1] = IEEE80211_DELBAPS_INIT;
1939 args[2] = reason; /* XXX reason code */
1940 ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA,
1941 IEEE80211_ACTION_BA_DELBA, args);
1942 } else {
1943 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1944 ni, "%s: BA stream for AC %d not running (reason %d)",
1945 __func__, tap->txa_ac, reason);
1946 vap->iv_stats.is_ampdu_stop_failed++;
1947 }
1948}
1949
1950static void
1951bar_timeout(void *arg)
1952{
1953 struct ieee80211_tx_ampdu *tap = arg;
1954 struct ieee80211_node *ni = tap->txa_ni;
1955
1956 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
1957 ("bar/addba collision, flags 0x%x", tap->txa_flags));
1958
1959 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1960 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
1961 tap->txa_ac, tap->txa_flags, tap->txa_attempts);
1962
1963 /* guard against race with bar_tx_complete */
1964 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
1965 return;
1966 /* XXX ? */
1967 if (tap->txa_attempts >= ieee80211_bar_maxtries)
1968 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
1969 else
1970 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
1971}
1972
1973static void
1974bar_start_timer(struct ieee80211_tx_ampdu *tap)
1975{
1976 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
1977}
1978
1979static void
1980bar_stop_timer(struct ieee80211_tx_ampdu *tap)
1981{
1982 callout_stop(&tap->txa_timer);
1983}
1984
1985static void
1986bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
1987{
1988 struct ieee80211_tx_ampdu *tap = arg;
1989
1990 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1991 ni, "%s: tid %u flags 0x%x pending %d status %d",
1992 __func__, tap->txa_ac, tap->txa_flags,
1993 callout_pending(&tap->txa_timer), status);
1994
1995 /* XXX locking */
1996 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
1997 callout_pending(&tap->txa_timer)) {
1998 struct ieee80211com *ic = ni->ni_ic;
1999
2000 if (status) /* ACK'd */
2001 bar_stop_timer(tap);
2002 ic->ic_bar_response(ni, tap, status);
2003 /* NB: just let timer expire so we pace requests */
2004 }
2005}
2006
2007static void
2008ieee80211_bar_response(struct ieee80211_node *ni,
2009 struct ieee80211_tx_ampdu *tap, int status)
2010{
2011
2012 if (status != 0) { /* got ACK */
2013 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2014 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2015 tap->txa_start,
2016 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2017 tap->txa_qframes, tap->txa_seqpending,
2018 WME_AC_TO_TID(tap->txa_ac));
2019
2020 /* NB: timer already stopped in bar_tx_complete */
2021 tap->txa_start = tap->txa_seqpending;
2022 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2023 }
2024}
2025
2026/*
2027 * Transmit a BAR frame to the specified node. The
2028 * BAR contents are drawn from the supplied aggregation
2029 * state associated with the node.
2030 *
2031 * NB: we only handle immediate ACK w/ compressed bitmap.
2032 */
2033int
2034ieee80211_send_bar(struct ieee80211_node *ni,
2035 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2036{
2037#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2038 struct ieee80211vap *vap = ni->ni_vap;
2039 struct ieee80211com *ic = ni->ni_ic;
2040 struct ieee80211_frame_bar *bar;
2041 struct mbuf *m;
2042 uint16_t barctl, barseqctl;
2043 uint8_t *frm;
2044 int tid, ret;
2045
2046 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2047 /* no ADDBA response, should not happen */
2048 /* XXX stat+msg */
2049 return EINVAL;
2050 }
2051 /* XXX locking */
2052 bar_stop_timer(tap);
2053
2054 ieee80211_ref_node(ni);
2055
2056 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2057 if (m == NULL)
2058 senderr(ENOMEM, is_tx_nobuf);
2059
2060 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2061 m_freem(m);
2062 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2063 /* NOTREACHED */
2064 }
2065
2066 bar = mtod(m, struct ieee80211_frame_bar *);
2067 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2068 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2069 bar->i_fc[1] = 0;
2070 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2071 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2072
2073 tid = WME_AC_TO_TID(tap->txa_ac);
2074 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2075 0 : IEEE80211_BAR_NOACK)
2076 | IEEE80211_BAR_COMP
2077 | SM(tid, IEEE80211_BAR_TID)
2078 ;
2079 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2080 /* NB: known to have proper alignment */
2081 bar->i_ctl = htole16(barctl);
2082 bar->i_seq = htole16(barseqctl);
2083 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2084
2085 M_WME_SETAC(m, WME_AC_VO);
2086
2087 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2088
2089 /* XXX locking */
2090 /* init/bump attempts counter */
2091 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2092 tap->txa_attempts = 1;
2093 else
2094 tap->txa_attempts++;
2095 tap->txa_seqpending = seq;
2096 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2097
2098 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2099 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2100 tid, barctl, seq, tap->txa_attempts);
2101
2102 ret = ic->ic_raw_xmit(ni, m, NULL);
2103 if (ret != 0) {
2104 /* xmit failed, clear state flag */
2105 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2106 goto bad;
2107 }
2108 /* XXX hack against tx complete happening before timer is started */
2109 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2110 bar_start_timer(tap);
2111 return 0;
2112bad:
2113 ieee80211_free_node(ni);
2114 return ret;
2115#undef senderr
2116}
2117
2118/*
2119 * Send an action management frame. The arguments are stuff
2120 * into a frame without inspection; the caller is assumed to
2121 * prepare them carefully (e.g. based on the aggregation state).
2122 */
2123int
2124ieee80211_send_action(struct ieee80211_node *ni,
2125 int category, int action, uint16_t args[4])
2126{
2127#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2128#define ADDSHORT(frm, v) do { \
2129 frm[0] = (v) & 0xff; \
2130 frm[1] = (v) >> 8; \
2131 frm += 2; \
2132} while (0)
2133 struct ieee80211vap *vap = ni->ni_vap;
2134 struct ieee80211com *ic = ni->ni_ic;
2135 struct ieee80211_bpf_params params;
2136 struct mbuf *m;
2137 uint8_t *frm;
2138 uint16_t baparamset;
2139 int ret;
2140
2141 KASSERT(ni != NULL, ("null node"));
2142
2143 /*
2144 * Hold a reference on the node so it doesn't go away until after
2145 * the xmit is complete all the way in the driver. On error we
2146 * will remove our reference.
2147 */
2148 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2149 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2150 __func__, __LINE__,
2151 ni, ether_sprintf(ni->ni_macaddr),
2152 ieee80211_node_refcnt(ni)+1);
2153 ieee80211_ref_node(ni);
2154
2155 m = ieee80211_getmgtframe(&frm,
2156 ic->ic_headroom + sizeof(struct ieee80211_frame),
2157 sizeof(uint16_t) /* action+category */
2158 /* XXX may action payload */
2159 + sizeof(struct ieee80211_action_ba_addbaresponse)
2160 );
2161 if (m == NULL)
2162 senderr(ENOMEM, is_tx_nobuf);
2163
2164 *frm++ = category;
2165 *frm++ = action;
2166 switch (category) {
2167 case IEEE80211_ACTION_CAT_BA:
2168 switch (action) {
2169 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
2170 IEEE80211_NOTE(vap,
2171 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2172 "send ADDBA request: dialogtoken %d "
2173 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2174 args[0], args[1], MS(args[1], IEEE80211_BAPS_TID),
2175 args[2], args[3]);
2176
2177 *frm++ = args[0]; /* dialog token */
2178 ADDSHORT(frm, args[1]); /* baparamset */
2179 ADDSHORT(frm, args[2]); /* batimeout */
2180 ADDSHORT(frm, args[3]); /* baseqctl */
2181 break;
2182 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
2183 IEEE80211_NOTE(vap,
2184 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2185 "send ADDBA response: dialogtoken %d status %d "
2186 "baparamset 0x%x (tid %d) batimeout %d",
2187 args[0], args[1], args[2],
2188 MS(args[2], IEEE80211_BAPS_TID), args[3]);
2189
2190 *frm++ = args[0]; /* dialog token */
2191 ADDSHORT(frm, args[1]); /* statuscode */
2192 ADDSHORT(frm, args[2]); /* baparamset */
2193 ADDSHORT(frm, args[3]); /* batimeout */
2194 break;
2195 case IEEE80211_ACTION_BA_DELBA:
2196 /* XXX */
2197 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2198 | args[1]
2199 ;
2200 ADDSHORT(frm, baparamset);
2201 ADDSHORT(frm, args[2]); /* reason code */
2202
2203 IEEE80211_NOTE(vap,
2204 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2205 "send DELBA action: tid %d, initiator %d reason %d",
2206 args[0], args[1], args[2]);
2207 break;
2208 default:
2209 goto badaction;
2210 }
2211 break;
2212 case IEEE80211_ACTION_CAT_HT:
2213 switch (action) {
2214 case IEEE80211_ACTION_HT_TXCHWIDTH:
2215 IEEE80211_NOTE(vap,
2216 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2217 ni, "send HT txchwidth: width %d",
2218 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20
2219 );
2220 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2221 IEEE80211_A_HT_TXCHWIDTH_2040 :
2222 IEEE80211_A_HT_TXCHWIDTH_20;
2223 break;
2224 default:
2225 goto badaction;
2226 }
2227 break;
2228 default:
2229 badaction:
2230 IEEE80211_NOTE(vap,
2231 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2232 "%s: unsupported category %d action %d", __func__,
2233 category, action);
2234 senderr(EINVAL, is_tx_unknownmgt);
2235 /* NOTREACHED */
2236 }
2237 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2238
2239 memset(¶ms, 0, sizeof(params));
2240 params.ibp_pri = WME_AC_VO;
2241 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2242 /* NB: we know all frames are unicast */
2243 params.ibp_try0 = ni->ni_txparms->maxretry;
2244 params.ibp_power = ni->ni_txpower;
2245 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2246 ¶ms);
2247bad:
2248 ieee80211_free_node(ni);
2249 if (m != NULL)
2250 m_freem(m);
2251 return ret;
2252#undef ADDSHORT
2253#undef senderr
2254}
2255
2256/*
2257 * Construct the MCS bit mask for inclusion
2258 * in an HT information element.
2259 */
2260static void
2261ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2262{
2263 int i;
2264
2265 for (i = 0; i < rs->rs_nrates; i++) {
2266 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2267 if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */
2268 /* NB: this assumes a particular implementation */
2269 setbit(frm, r);
2270 }
2271 }
2272}
2273
2274/*
2275 * Add body of an HTCAP information element.
2276 */
2277static uint8_t *
2278ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2279{
2280#define ADDSHORT(frm, v) do { \
2281 frm[0] = (v) & 0xff; \
2282 frm[1] = (v) >> 8; \
2283 frm += 2; \
2284} while (0)
2285 struct ieee80211vap *vap = ni->ni_vap;
2286 uint16_t caps;
2287 int rxmax, density;
2288
2289 /* HT capabilities */
2290 caps = vap->iv_htcaps & 0xffff;
2291 /*
2292 * Note channel width depends on whether we are operating as
2293 * a sta or not. When operating as a sta we are generating
2294 * a request based on our desired configuration. Otherwise
2295 * we are operational and the channel attributes identify
2296 * how we've been setup (which might be different if a fixed
2297 * channel is specified).
2298 */
2299 if (vap->iv_opmode == IEEE80211_M_STA) {
2300 /* override 20/40 use based on config */
2301 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2302 caps |= IEEE80211_HTCAP_CHWIDTH40;
2303 else
2304 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2305 /* use advertised setting (XXX locally constraint) */
2306 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2307 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2308 } else {
2309 /* override 20/40 use based on current channel */
2310 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2311 caps |= IEEE80211_HTCAP_CHWIDTH40;
2312 else
2313 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2314 rxmax = vap->iv_ampdu_rxmax;
2315 density = vap->iv_ampdu_density;
2316 }
2317 /* adjust short GI based on channel and config */
2318 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2319 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2320 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2321 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2322 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2323 ADDSHORT(frm, caps);
2324
2325 /* HT parameters */
2326 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2327 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2328 ;
2329 frm++;
2330
2331 /* pre-zero remainder of ie */
2332 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2333 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2334
2335 /* supported MCS set */
2336 /*
2337 * XXX it would better to get the rate set from ni_htrates
2338 * so we can restrict it but for sta mode ni_htrates isn't
2339 * setup when we're called to form an AssocReq frame so for
2340 * now we're restricted to the default HT rate set.
2341 */
2342 ieee80211_set_htrates(frm, &ieee80211_rateset_11n);
2343
2344 frm += sizeof(struct ieee80211_ie_htcap) -
2345 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2346 return frm;
2347#undef ADDSHORT
2348}
2349
2350/*
2351 * Add 802.11n HT capabilities information element
2352 */
2353uint8_t *
2354ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2355{
2356 frm[0] = IEEE80211_ELEMID_HTCAP;
2357 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2358 return ieee80211_add_htcap_body(frm + 2, ni);
2359}
2360
2361/*
2362 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2363 * used for compatibility w/ pre-draft implementations.
2364 */
2365uint8_t *
2366ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2367{
2368 frm[0] = IEEE80211_ELEMID_VENDOR;
2369 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2370 frm[2] = (BCM_OUI >> 0) & 0xff;
2371 frm[3] = (BCM_OUI >> 8) & 0xff;
2372 frm[4] = (BCM_OUI >> 16) & 0xff;
2373 frm[5] = BCM_OUI_HTCAP;
2374 return ieee80211_add_htcap_body(frm + 6, ni);
2375}
2376
2377/*
2378 * Construct the MCS bit mask of basic rates
2379 * for inclusion in an HT information element.
2380 */
2381static void
2382ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2383{
2384 int i;
2385
2386 for (i = 0; i < rs->rs_nrates; i++) {
2387 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2388 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2389 r < IEEE80211_HTRATE_MAXSIZE) {
2390 /* NB: this assumes a particular implementation */
2391 setbit(frm, r);
2392 }
2393 }
2394}
2395
2396/*
2397 * Update the HTINFO ie for a beacon frame.
2398 */
2399void
2400ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2401 struct ieee80211_beacon_offsets *bo)
2402{
2403#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2404 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
2405 struct ieee80211com *ic = vap->iv_ic;
2406 struct ieee80211_ie_htinfo *ht =
2407 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2408
2409 /* XXX only update on channel change */
2410 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2411 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2412 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2413 else
2414 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2415 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2416 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2417 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2418 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2419 else
2420 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2421 if (IEEE80211_IS_CHAN_HT40(bsschan))
2422 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2423
2424 /* protection mode */
2425 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2426
2427 /* XXX propagate to vendor ie's */
2428#undef PROTMODE
2429}
2430
2431/*
2432 * Add body of an HTINFO information element.
2433 *
2434 * NB: We don't use struct ieee80211_ie_htinfo because we can
2435 * be called to fillin both a standard ie and a compat ie that
2436 * has a vendor OUI at the front.
2437 */
2438static uint8_t *
2439ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2440{
2441 struct ieee80211vap *vap = ni->ni_vap;
2442 struct ieee80211com *ic = ni->ni_ic;
2443
2444 /* pre-zero remainder of ie */
2445 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2446
2447 /* primary/control channel center */
2448 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2449
2450 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2451 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2452 else
2453 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2454 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2455 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2456 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2457 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2458 else
2459 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2460 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2461 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2462
2463 frm[1] = ic->ic_curhtprotmode;
2464
2465 frm += 5;
2466
2467 /* basic MCS set */
2468 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2469 frm += sizeof(struct ieee80211_ie_htinfo) -
2470 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2471 return frm;
2472}
2473
2474/*
2475 * Add 802.11n HT information information element.
2476 */
2477uint8_t *
2478ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2479{
2480 frm[0] = IEEE80211_ELEMID_HTINFO;
2481 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2482 return ieee80211_add_htinfo_body(frm + 2, ni);
2483}
2484
2485/*
2486 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2487 * used for compatibility w/ pre-draft implementations.
2488 */
2489uint8_t *
2490ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2491{
2492 frm[0] = IEEE80211_ELEMID_VENDOR;
2493 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2494 frm[2] = (BCM_OUI >> 0) & 0xff;
2495 frm[3] = (BCM_OUI >> 8) & 0xff;
2496 frm[4] = (BCM_OUI >> 16) & 0xff;
2497 frm[5] = BCM_OUI_HTINFO;
2498 return ieee80211_add_htinfo_body(frm + 6, ni);
2499}
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