1 /*-
2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30
31 /*
32 * IEEE 802.11n protocol support.
33 */
34
35 #include "opt_inet.h"
36 #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_action.h>
51 #include <net80211/ieee80211_input.h>
52
53 /* define here, used throughout file */
54 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
55 #define SM(_v, _f) (((_v) << _f##_S) & _f)
56
57 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
58 { 13, 14, 27, 30 }, /* MCS 0 */
59 { 26, 29, 54, 60 }, /* MCS 1 */
60 { 39, 43, 81, 90 }, /* MCS 2 */
61 { 52, 58, 108, 120 }, /* MCS 3 */
62 { 78, 87, 162, 180 }, /* MCS 4 */
63 { 104, 116, 216, 240 }, /* MCS 5 */
64 { 117, 130, 243, 270 }, /* MCS 6 */
65 { 130, 144, 270, 300 }, /* MCS 7 */
66 { 26, 29, 54, 60 }, /* MCS 8 */
67 { 52, 58, 108, 120 }, /* MCS 9 */
68 { 78, 87, 162, 180 }, /* MCS 10 */
69 { 104, 116, 216, 240 }, /* MCS 11 */
70 { 156, 173, 324, 360 }, /* MCS 12 */
71 { 208, 231, 432, 480 }, /* MCS 13 */
72 { 234, 260, 486, 540 }, /* MCS 14 */
73 { 260, 289, 540, 600 }, /* MCS 15 */
74 { 39, 43, 81, 90 }, /* MCS 16 */
75 { 78, 87, 162, 180 }, /* MCS 17 */
76 { 117, 130, 243, 270 }, /* MCS 18 */
77 { 156, 173, 324, 360 }, /* MCS 19 */
78 { 234, 260, 486, 540 }, /* MCS 20 */
79 { 312, 347, 648, 720 }, /* MCS 21 */
80 { 351, 390, 729, 810 }, /* MCS 22 */
81 { 390, 433, 810, 900 }, /* MCS 23 */
82 { 52, 58, 108, 120 }, /* MCS 24 */
83 { 104, 116, 216, 240 }, /* MCS 25 */
84 { 156, 173, 324, 360 }, /* MCS 26 */
85 { 208, 231, 432, 480 }, /* MCS 27 */
86 { 312, 347, 648, 720 }, /* MCS 28 */
87 { 416, 462, 864, 960 }, /* MCS 29 */
88 { 468, 520, 972, 1080 }, /* MCS 30 */
89 { 520, 578, 1080, 1200 }, /* MCS 31 */
90 { 0, 0, 12, 13 }, /* MCS 32 */
91 { 78, 87, 162, 180 }, /* MCS 33 */
92 { 104, 116, 216, 240 }, /* MCS 34 */
93 { 130, 144, 270, 300 }, /* MCS 35 */
94 { 117, 130, 243, 270 }, /* MCS 36 */
95 { 156, 173, 324, 360 }, /* MCS 37 */
96 { 195, 217, 405, 450 }, /* MCS 38 */
97 { 104, 116, 216, 240 }, /* MCS 39 */
98 { 130, 144, 270, 300 }, /* MCS 40 */
99 { 130, 144, 270, 300 }, /* MCS 41 */
100 { 156, 173, 324, 360 }, /* MCS 42 */
101 { 182, 202, 378, 420 }, /* MCS 43 */
102 { 182, 202, 378, 420 }, /* MCS 44 */
103 { 208, 231, 432, 480 }, /* MCS 45 */
104 { 156, 173, 324, 360 }, /* MCS 46 */
105 { 195, 217, 405, 450 }, /* MCS 47 */
106 { 195, 217, 405, 450 }, /* MCS 48 */
107 { 234, 260, 486, 540 }, /* MCS 49 */
108 { 273, 303, 567, 630 }, /* MCS 50 */
109 { 273, 303, 567, 630 }, /* MCS 51 */
110 { 312, 347, 648, 720 }, /* MCS 52 */
111 { 130, 144, 270, 300 }, /* MCS 53 */
112 { 156, 173, 324, 360 }, /* MCS 54 */
113 { 182, 202, 378, 420 }, /* MCS 55 */
114 { 156, 173, 324, 360 }, /* MCS 56 */
115 { 182, 202, 378, 420 }, /* MCS 57 */
116 { 208, 231, 432, 480 }, /* MCS 58 */
117 { 234, 260, 486, 540 }, /* MCS 59 */
118 { 208, 231, 432, 480 }, /* MCS 60 */
119 { 234, 260, 486, 540 }, /* MCS 61 */
120 { 260, 289, 540, 600 }, /* MCS 62 */
121 { 260, 289, 540, 600 }, /* MCS 63 */
122 { 286, 318, 594, 660 }, /* MCS 64 */
123 { 195, 217, 405, 450 }, /* MCS 65 */
124 { 234, 260, 486, 540 }, /* MCS 66 */
125 { 273, 303, 567, 630 }, /* MCS 67 */
126 { 234, 260, 486, 540 }, /* MCS 68 */
127 { 273, 303, 567, 630 }, /* MCS 69 */
128 { 312, 347, 648, 720 }, /* MCS 70 */
129 { 351, 390, 729, 810 }, /* MCS 71 */
130 { 312, 347, 648, 720 }, /* MCS 72 */
131 { 351, 390, 729, 810 }, /* MCS 73 */
132 { 390, 433, 810, 900 }, /* MCS 74 */
133 { 390, 433, 810, 900 }, /* MCS 75 */
134 { 429, 477, 891, 990 }, /* MCS 76 */
135 };
136
137 #ifdef IEEE80211_AMPDU_AGE
138 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
139 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
140 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
141 "AMPDU max reorder age (ms)");
142 #endif
143
144 static int ieee80211_recv_bar_ena = 1;
145 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
146 0, "BAR frame processing (ena/dis)");
147
148 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
149 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
150 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
151 "ADDBA request timeout (ms)");
152 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
153 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
154 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
155 "ADDBA request backoff (ms)");
156 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
157 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
158 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
159
160 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
161 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
162
163 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
164 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
165 static ieee80211_recv_action_func ht_recv_action_ba_delba;
166 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
167 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
168
169 static ieee80211_send_action_func ht_send_action_ba_addba;
170 static ieee80211_send_action_func ht_send_action_ba_delba;
171 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
172
173 static void
174 ieee80211_ht_init(void)
175 {
176 /*
177 * Setup HT parameters that depends on the clock frequency.
178 */
179 #ifdef IEEE80211_AMPDU_AGE
180 ieee80211_ampdu_age = msecs_to_ticks(500);
181 #endif
182 ieee80211_addba_timeout = msecs_to_ticks(250);
183 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
184 ieee80211_bar_timeout = msecs_to_ticks(250);
185 /*
186 * Register action frame handlers.
187 */
188 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
189 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
190 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
191 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
192 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
193 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
194 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
195 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
196 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
197 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
198
199 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
200 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
201 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
202 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
203 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
204 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
205 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
206 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
207 }
208 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
209
210 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
211 struct ieee80211_tx_ampdu *tap);
212 static int ieee80211_addba_request(struct ieee80211_node *ni,
213 struct ieee80211_tx_ampdu *tap,
214 int dialogtoken, int baparamset, int batimeout);
215 static int ieee80211_addba_response(struct ieee80211_node *ni,
216 struct ieee80211_tx_ampdu *tap,
217 int code, int baparamset, int batimeout);
218 static void ieee80211_addba_stop(struct ieee80211_node *ni,
219 struct ieee80211_tx_ampdu *tap);
220 static void null_addba_response_timeout(struct ieee80211_node *ni,
221 struct ieee80211_tx_ampdu *tap);
222
223 static void ieee80211_bar_response(struct ieee80211_node *ni,
224 struct ieee80211_tx_ampdu *tap, int status);
225 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
226 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
227 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
228 int baparamset, int batimeout, int baseqctl);
229 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
230
231 void
232 ieee80211_ht_attach(struct ieee80211com *ic)
233 {
234 /* setup default aggregation policy */
235 ic->ic_recv_action = ieee80211_recv_action;
236 ic->ic_send_action = ieee80211_send_action;
237 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
238 ic->ic_addba_request = ieee80211_addba_request;
239 ic->ic_addba_response = ieee80211_addba_response;
240 ic->ic_addba_response_timeout = null_addba_response_timeout;
241 ic->ic_addba_stop = ieee80211_addba_stop;
242 ic->ic_bar_response = ieee80211_bar_response;
243 ic->ic_ampdu_rx_start = ampdu_rx_start;
244 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
245
246 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
247 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
248 }
249
250 void
251 ieee80211_ht_detach(struct ieee80211com *ic)
252 {
253 }
254
255 void
256 ieee80211_ht_vattach(struct ieee80211vap *vap)
257 {
258
259 /* driver can override defaults */
260 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
261 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
262 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
263 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
264 /* tx aggregation traffic thresholds */
265 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
266 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
267 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
268 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
269
270 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
271 /*
272 * Device is HT capable; enable all HT-related
273 * facilities by default.
274 * XXX these choices may be too aggressive.
275 */
276 vap->iv_flags_ht |= IEEE80211_FHT_HT
277 | IEEE80211_FHT_HTCOMPAT
278 ;
279 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
280 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
281 /* XXX infer from channel list? */
282 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
283 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
284 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
285 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
286 }
287 /* enable RIFS if capable */
288 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
289 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
290
291 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
292 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
293 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
294 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
295 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
296 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
297 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
298 }
299 /* NB: disable default legacy WDS, too many issues right now */
300 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
301 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
302 }
303
304 void
305 ieee80211_ht_vdetach(struct ieee80211vap *vap)
306 {
307 }
308
309 static int
310 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
311 int ratetype)
312 {
313 int mword, rate;
314
315 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
316 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
317 return (0);
318 switch (ratetype) {
319 case 0:
320 rate = ieee80211_htrates[index].ht20_rate_800ns;
321 break;
322 case 1:
323 rate = ieee80211_htrates[index].ht20_rate_400ns;
324 break;
325 case 2:
326 rate = ieee80211_htrates[index].ht40_rate_800ns;
327 break;
328 default:
329 rate = ieee80211_htrates[index].ht40_rate_400ns;
330 break;
331 }
332 return (rate);
333 }
334
335 static struct printranges {
336 int minmcs;
337 int maxmcs;
338 int txstream;
339 int ratetype;
340 int htcapflags;
341 } ranges[] = {
342 { 0, 7, 1, 0, 0 },
343 { 8, 15, 2, 0, 0 },
344 { 16, 23, 3, 0, 0 },
345 { 24, 31, 4, 0, 0 },
346 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
347 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
348 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
349 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
350 { 0, 0, 0, 0, 0 },
351 };
352
353 static void
354 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
355 {
356 struct ifnet *ifp = ic->ic_ifp;
357 int minrate, maxrate;
358 struct printranges *range;
359
360 for (range = ranges; range->txstream != 0; range++) {
361 if (ic->ic_txstream < range->txstream)
362 continue;
363 if (range->htcapflags &&
364 (ic->ic_htcaps & range->htcapflags) == 0)
365 continue;
366 if (ratetype < range->ratetype)
367 continue;
368 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
369 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
370 if (range->maxmcs) {
371 if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
372 range->minmcs, range->maxmcs,
373 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
374 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
375 } else {
376 if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs,
377 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
378 }
379 }
380 }
381
382 static void
383 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
384 {
385 struct ifnet *ifp = ic->ic_ifp;
386 const char *modestr = ieee80211_phymode_name[mode];
387
388 if_printf(ifp, "%s MCS 20MHz\n", modestr);
389 ht_rateprint(ic, mode, 0);
390 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
391 if_printf(ifp, "%s MCS 20MHz SGI\n", modestr);
392 ht_rateprint(ic, mode, 1);
393 }
394 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
395 if_printf(ifp, "%s MCS 40MHz:\n", modestr);
396 ht_rateprint(ic, mode, 2);
397 }
398 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
399 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
400 if_printf(ifp, "%s MCS 40MHz SGI:\n", modestr);
401 ht_rateprint(ic, mode, 3);
402 }
403 }
404
405 void
406 ieee80211_ht_announce(struct ieee80211com *ic)
407 {
408 struct ifnet *ifp = ic->ic_ifp;
409
410 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
411 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
412 if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
413 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
414 ht_announce(ic, IEEE80211_MODE_11NA);
415 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
416 ht_announce(ic, IEEE80211_MODE_11NG);
417 }
418
419 static struct ieee80211_htrateset htrateset;
420
421 const struct ieee80211_htrateset *
422 ieee80211_get_suphtrates(struct ieee80211com *ic,
423 const struct ieee80211_channel *c)
424 {
425 #define ADDRATE(x) do { \
426 htrateset.rs_rates[htrateset.rs_nrates] = x; \
427 htrateset.rs_nrates++; \
428 } while (0)
429 int i;
430
431 memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
432 for (i = 0; i < ic->ic_txstream * 8; i++)
433 ADDRATE(i);
434 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
435 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
436 ADDRATE(32);
437 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
438 if (ic->ic_txstream >= 2) {
439 for (i = 33; i <= 38; i++)
440 ADDRATE(i);
441 }
442 if (ic->ic_txstream >= 3) {
443 for (i = 39; i <= 52; i++)
444 ADDRATE(i);
445 }
446 if (ic->ic_txstream == 4) {
447 for (i = 53; i <= 76; i++)
448 ADDRATE(i);
449 }
450 }
451 return &htrateset;
452 #undef ADDRATE
453 }
454
455 /*
456 * Receive processing.
457 */
458
459 /*
460 * Decap the encapsulated A-MSDU frames and dispatch all but
461 * the last for delivery. The last frame is returned for
462 * delivery via the normal path.
463 */
464 struct mbuf *
465 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
466 {
467 struct ieee80211vap *vap = ni->ni_vap;
468 int framelen;
469 struct mbuf *n;
470
471 /* discard 802.3 header inserted by ieee80211_decap */
472 m_adj(m, sizeof(struct ether_header));
473
474 vap->iv_stats.is_amsdu_decap++;
475
476 for (;;) {
477 /*
478 * Decap the first frame, bust it apart from the
479 * remainder and deliver. We leave the last frame
480 * delivery to the caller (for consistency with other
481 * code paths, could also do it here).
482 */
483 m = ieee80211_decap1(m, &framelen);
484 if (m == NULL) {
485 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
486 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
487 vap->iv_stats.is_amsdu_tooshort++;
488 return NULL;
489 }
490 if (m->m_pkthdr.len == framelen)
491 break;
492 n = m_split(m, framelen, M_NOWAIT);
493 if (n == NULL) {
494 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
495 ni->ni_macaddr, "a-msdu",
496 "%s", "unable to split encapsulated frames");
497 vap->iv_stats.is_amsdu_split++;
498 m_freem(m); /* NB: must reclaim */
499 return NULL;
500 }
501 vap->iv_deliver_data(vap, ni, m);
502
503 /*
504 * Remove frame contents; each intermediate frame
505 * is required to be aligned to a 4-byte boundary.
506 */
507 m = n;
508 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
509 }
510 return m; /* last delivered by caller */
511 }
512
513 /*
514 * Purge all frames in the A-MPDU re-order queue.
515 */
516 static void
517 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
518 {
519 struct mbuf *m;
520 int i;
521
522 for (i = 0; i < rap->rxa_wnd; i++) {
523 m = rap->rxa_m[i];
524 if (m != NULL) {
525 rap->rxa_m[i] = NULL;
526 rap->rxa_qbytes -= m->m_pkthdr.len;
527 m_freem(m);
528 if (--rap->rxa_qframes == 0)
529 break;
530 }
531 }
532 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
533 ("lost %u data, %u frames on ampdu rx q",
534 rap->rxa_qbytes, rap->rxa_qframes));
535 }
536
537 /*
538 * Start A-MPDU rx/re-order processing for the specified TID.
539 */
540 static int
541 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
542 int baparamset, int batimeout, int baseqctl)
543 {
544 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
545
546 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
547 /*
548 * AMPDU previously setup and not terminated with a DELBA,
549 * flush the reorder q's in case anything remains.
550 */
551 ampdu_rx_purge(rap);
552 }
553 memset(rap, 0, sizeof(*rap));
554 rap->rxa_wnd = (bufsiz == 0) ?
555 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
556 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
557 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
558
559 return 0;
560 }
561
562 /*
563 * Stop A-MPDU rx processing for the specified TID.
564 */
565 static void
566 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
567 {
568
569 ampdu_rx_purge(rap);
570 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
571 }
572
573 /*
574 * Dispatch a frame from the A-MPDU reorder queue. The
575 * frame is fed back into ieee80211_input marked with an
576 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
577 * permits ieee80211_input to optimize re-processing).
578 */
579 static __inline void
580 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
581 {
582 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
583 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
584 (void) ieee80211_input(ni, m, 0, 0);
585 }
586
587 /*
588 * Dispatch as many frames as possible from the re-order queue.
589 * Frames will always be "at the front"; we process all frames
590 * up to the first empty slot in the window. On completion we
591 * cleanup state if there are still pending frames in the current
592 * BA window. We assume the frame at slot 0 is already handled
593 * by the caller; we always start at slot 1.
594 */
595 static void
596 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
597 {
598 struct ieee80211vap *vap = ni->ni_vap;
599 struct mbuf *m;
600 int i;
601
602 /* flush run of frames */
603 for (i = 1; i < rap->rxa_wnd; i++) {
604 m = rap->rxa_m[i];
605 if (m == NULL)
606 break;
607 rap->rxa_m[i] = NULL;
608 rap->rxa_qbytes -= m->m_pkthdr.len;
609 rap->rxa_qframes--;
610
611 ampdu_dispatch(ni, m);
612 }
613 /*
614 * If frames remain, copy the mbuf pointers down so
615 * they correspond to the offsets in the new window.
616 */
617 if (rap->rxa_qframes != 0) {
618 int n = rap->rxa_qframes, j;
619 for (j = i+1; j < rap->rxa_wnd; j++) {
620 if (rap->rxa_m[j] != NULL) {
621 rap->rxa_m[j-i] = rap->rxa_m[j];
622 rap->rxa_m[j] = NULL;
623 if (--n == 0)
624 break;
625 }
626 }
627 KASSERT(n == 0, ("lost %d frames", n));
628 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
629 }
630 /*
631 * Adjust the start of the BA window to
632 * reflect the frames just dispatched.
633 */
634 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
635 vap->iv_stats.is_ampdu_rx_oor += i;
636 }
637
638 #ifdef IEEE80211_AMPDU_AGE
639 /*
640 * Dispatch all frames in the A-MPDU re-order queue.
641 */
642 static void
643 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
644 {
645 struct ieee80211vap *vap = ni->ni_vap;
646 struct mbuf *m;
647 int i;
648
649 for (i = 0; i < rap->rxa_wnd; i++) {
650 m = rap->rxa_m[i];
651 if (m == NULL)
652 continue;
653 rap->rxa_m[i] = NULL;
654 rap->rxa_qbytes -= m->m_pkthdr.len;
655 rap->rxa_qframes--;
656 vap->iv_stats.is_ampdu_rx_oor++;
657
658 ampdu_dispatch(ni, m);
659 if (rap->rxa_qframes == 0)
660 break;
661 }
662 }
663 #endif /* IEEE80211_AMPDU_AGE */
664
665 /*
666 * Dispatch all frames in the A-MPDU re-order queue
667 * preceding the specified sequence number. This logic
668 * handles window moves due to a received MSDU or BAR.
669 */
670 static void
671 ampdu_rx_flush_upto(struct ieee80211_node *ni,
672 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
673 {
674 struct ieee80211vap *vap = ni->ni_vap;
675 struct mbuf *m;
676 ieee80211_seq seqno;
677 int i;
678
679 /*
680 * Flush any complete MSDU's with a sequence number lower
681 * than winstart. Gaps may exist. Note that we may actually
682 * dispatch frames past winstart if a run continues; this is
683 * an optimization that avoids having to do a separate pass
684 * to dispatch frames after moving the BA window start.
685 */
686 seqno = rap->rxa_start;
687 for (i = 0; i < rap->rxa_wnd; i++) {
688 m = rap->rxa_m[i];
689 if (m != NULL) {
690 rap->rxa_m[i] = NULL;
691 rap->rxa_qbytes -= m->m_pkthdr.len;
692 rap->rxa_qframes--;
693 vap->iv_stats.is_ampdu_rx_oor++;
694
695 ampdu_dispatch(ni, m);
696 } else {
697 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
698 break;
699 }
700 seqno = IEEE80211_SEQ_INC(seqno);
701 }
702 /*
703 * If frames remain, copy the mbuf pointers down so
704 * they correspond to the offsets in the new window.
705 */
706 if (rap->rxa_qframes != 0) {
707 int n = rap->rxa_qframes, j;
708
709 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
710 KASSERT(rap->rxa_m[0] == NULL,
711 ("%s: BA window slot 0 occupied", __func__));
712 for (j = i+1; j < rap->rxa_wnd; j++) {
713 if (rap->rxa_m[j] != NULL) {
714 rap->rxa_m[j-i] = rap->rxa_m[j];
715 rap->rxa_m[j] = NULL;
716 if (--n == 0)
717 break;
718 }
719 }
720 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
721 "BA win <%d:%d> winstart %d",
722 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
723 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
724 winstart));
725 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
726 }
727 /*
728 * Move the start of the BA window; we use the
729 * sequence number of the last MSDU that was
730 * passed up the stack+1 or winstart if stopped on
731 * a gap in the reorder buffer.
732 */
733 rap->rxa_start = seqno;
734 }
735
736 /*
737 * Process a received QoS data frame for an HT station. Handle
738 * A-MPDU reordering: if this frame is received out of order
739 * and falls within the BA window hold onto it. Otherwise if
740 * this frame completes a run, flush any pending frames. We
741 * return 1 if the frame is consumed. A 0 is returned if
742 * the frame should be processed normally by the caller.
743 */
744 int
745 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
746 {
747 #define IEEE80211_FC0_QOSDATA \
748 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
749 #define PROCESS 0 /* caller should process frame */
750 #define CONSUMED 1 /* frame consumed, caller does nothing */
751 struct ieee80211vap *vap = ni->ni_vap;
752 struct ieee80211_qosframe *wh;
753 struct ieee80211_rx_ampdu *rap;
754 ieee80211_seq rxseq;
755 uint8_t tid;
756 int off;
757
758 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
759 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
760 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
761
762 /* NB: m_len known to be sufficient */
763 wh = mtod(m, struct ieee80211_qosframe *);
764 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
765 /*
766 * Not QoS data, shouldn't get here but just
767 * return it to the caller for processing.
768 */
769 return PROCESS;
770 }
771 if (IEEE80211_IS_DSTODS(wh))
772 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
773 else
774 tid = wh->i_qos[0];
775 tid &= IEEE80211_QOS_TID;
776 rap = &ni->ni_rx_ampdu[tid];
777 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
778 /*
779 * No ADDBA request yet, don't touch.
780 */
781 return PROCESS;
782 }
783 rxseq = le16toh(*(uint16_t *)wh->i_seq);
784 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
785 /*
786 * Fragments are not allowed; toss.
787 */
788 IEEE80211_DISCARD_MAC(vap,
789 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
790 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
791 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
792 vap->iv_stats.is_ampdu_rx_drop++;
793 IEEE80211_NODE_STAT(ni, rx_drop);
794 m_freem(m);
795 return CONSUMED;
796 }
797 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
798 rap->rxa_nframes++;
799 again:
800 if (rxseq == rap->rxa_start) {
801 /*
802 * First frame in window.
803 */
804 if (rap->rxa_qframes != 0) {
805 /*
806 * Dispatch as many packets as we can.
807 */
808 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
809 ampdu_dispatch(ni, m);
810 ampdu_rx_dispatch(rap, ni);
811 return CONSUMED;
812 } else {
813 /*
814 * In order; advance window and notify
815 * caller to dispatch directly.
816 */
817 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
818 return PROCESS;
819 }
820 }
821 /*
822 * Frame is out of order; store if in the BA window.
823 */
824 /* calculate offset in BA window */
825 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
826 if (off < rap->rxa_wnd) {
827 /*
828 * Common case (hopefully): in the BA window.
829 * Sec 9.10.7.6.2 a) (p.137)
830 */
831 #ifdef IEEE80211_AMPDU_AGE
832 /*
833 * Check for frames sitting too long in the reorder queue.
834 * This should only ever happen if frames are not delivered
835 * without the sender otherwise notifying us (e.g. with a
836 * BAR to move the window). Typically this happens because
837 * of vendor bugs that cause the sequence number to jump.
838 * When this happens we get a gap in the reorder queue that
839 * leaves frame sitting on the queue until they get pushed
840 * out due to window moves. When the vendor does not send
841 * BAR this move only happens due to explicit packet sends
842 *
843 * NB: we only track the time of the oldest frame in the
844 * reorder q; this means that if we flush we might push
845 * frames that still "new"; if this happens then subsequent
846 * frames will result in BA window moves which cost something
847 * but is still better than a big throughput dip.
848 */
849 if (rap->rxa_qframes != 0) {
850 /* XXX honor batimeout? */
851 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
852 /*
853 * Too long since we received the first
854 * frame; flush the reorder buffer.
855 */
856 if (rap->rxa_qframes != 0) {
857 vap->iv_stats.is_ampdu_rx_age +=
858 rap->rxa_qframes;
859 ampdu_rx_flush(ni, rap);
860 }
861 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
862 return PROCESS;
863 }
864 } else {
865 /*
866 * First frame, start aging timer.
867 */
868 rap->rxa_age = ticks;
869 }
870 #endif /* IEEE80211_AMPDU_AGE */
871 /* save packet */
872 if (rap->rxa_m[off] == NULL) {
873 rap->rxa_m[off] = m;
874 rap->rxa_qframes++;
875 rap->rxa_qbytes += m->m_pkthdr.len;
876 vap->iv_stats.is_ampdu_rx_reorder++;
877 } else {
878 IEEE80211_DISCARD_MAC(vap,
879 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
880 ni->ni_macaddr, "a-mpdu duplicate",
881 "seqno %u tid %u BA win <%u:%u>",
882 rxseq, tid, rap->rxa_start,
883 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
884 vap->iv_stats.is_rx_dup++;
885 IEEE80211_NODE_STAT(ni, rx_dup);
886 m_freem(m);
887 }
888 return CONSUMED;
889 }
890 if (off < IEEE80211_SEQ_BA_RANGE) {
891 /*
892 * Outside the BA window, but within range;
893 * flush the reorder q and move the window.
894 * Sec 9.10.7.6.2 b) (p.138)
895 */
896 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
897 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
898 rap->rxa_start,
899 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
900 rap->rxa_qframes, rxseq, tid);
901 vap->iv_stats.is_ampdu_rx_move++;
902
903 /*
904 * The spec says to flush frames up to but not including:
905 * WinStart_B = rxseq - rap->rxa_wnd + 1
906 * Then insert the frame or notify the caller to process
907 * it immediately. We can safely do this by just starting
908 * over again because we know the frame will now be within
909 * the BA window.
910 */
911 /* NB: rxa_wnd known to be >0 */
912 ampdu_rx_flush_upto(ni, rap,
913 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
914 goto again;
915 } else {
916 /*
917 * Outside the BA window and out of range; toss.
918 * Sec 9.10.7.6.2 c) (p.138)
919 */
920 IEEE80211_DISCARD_MAC(vap,
921 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
922 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
923 rap->rxa_start,
924 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
925 rap->rxa_qframes, rxseq, tid,
926 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
927 vap->iv_stats.is_ampdu_rx_drop++;
928 IEEE80211_NODE_STAT(ni, rx_drop);
929 m_freem(m);
930 return CONSUMED;
931 }
932 #undef CONSUMED
933 #undef PROCESS
934 #undef IEEE80211_FC0_QOSDATA
935 }
936
937 /*
938 * Process a BAR ctl frame. Dispatch all frames up to
939 * the sequence number of the frame. If this frame is
940 * out of range it's discarded.
941 */
942 void
943 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
944 {
945 struct ieee80211vap *vap = ni->ni_vap;
946 struct ieee80211_frame_bar *wh;
947 struct ieee80211_rx_ampdu *rap;
948 ieee80211_seq rxseq;
949 int tid, off;
950
951 if (!ieee80211_recv_bar_ena) {
952 #if 0
953 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
954 ni->ni_macaddr, "BAR", "%s", "processing disabled");
955 #endif
956 vap->iv_stats.is_ampdu_bar_bad++;
957 return;
958 }
959 wh = mtod(m0, struct ieee80211_frame_bar *);
960 /* XXX check basic BAR */
961 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
962 rap = &ni->ni_rx_ampdu[tid];
963 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
964 /*
965 * No ADDBA request yet, don't touch.
966 */
967 IEEE80211_DISCARD_MAC(vap,
968 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
969 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
970 vap->iv_stats.is_ampdu_bar_bad++;
971 return;
972 }
973 vap->iv_stats.is_ampdu_bar_rx++;
974 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
975 if (rxseq == rap->rxa_start)
976 return;
977 /* calculate offset in BA window */
978 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
979 if (off < IEEE80211_SEQ_BA_RANGE) {
980 /*
981 * Flush the reorder q up to rxseq and move the window.
982 * Sec 9.10.7.6.3 a) (p.138)
983 */
984 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
985 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
986 rap->rxa_start,
987 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
988 rap->rxa_qframes, rxseq, tid);
989 vap->iv_stats.is_ampdu_bar_move++;
990
991 ampdu_rx_flush_upto(ni, rap, rxseq);
992 if (off >= rap->rxa_wnd) {
993 /*
994 * BAR specifies a window start to the right of BA
995 * window; we must move it explicitly since
996 * ampdu_rx_flush_upto will not.
997 */
998 rap->rxa_start = rxseq;
999 }
1000 } else {
1001 /*
1002 * Out of range; toss.
1003 * Sec 9.10.7.6.3 b) (p.138)
1004 */
1005 IEEE80211_DISCARD_MAC(vap,
1006 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1007 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1008 rap->rxa_start,
1009 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1010 rap->rxa_qframes, rxseq, tid,
1011 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1012 vap->iv_stats.is_ampdu_bar_oow++;
1013 IEEE80211_NODE_STAT(ni, rx_drop);
1014 }
1015 }
1016
1017 /*
1018 * Setup HT-specific state in a node. Called only
1019 * when HT use is negotiated so we don't do extra
1020 * work for temporary and/or legacy sta's.
1021 */
1022 void
1023 ieee80211_ht_node_init(struct ieee80211_node *ni)
1024 {
1025 struct ieee80211_tx_ampdu *tap;
1026 int ac;
1027
1028 if (ni->ni_flags & IEEE80211_NODE_HT) {
1029 /*
1030 * Clean AMPDU state on re-associate. This handles the case
1031 * where a station leaves w/o notifying us and then returns
1032 * before node is reaped for inactivity.
1033 */
1034 ieee80211_ht_node_cleanup(ni);
1035 }
1036 for (ac = 0; ac < WME_NUM_AC; ac++) {
1037 tap = &ni->ni_tx_ampdu[ac];
1038 tap->txa_ac = ac;
1039 tap->txa_ni = ni;
1040 /* NB: further initialization deferred */
1041 }
1042 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1043 }
1044
1045 /*
1046 * Cleanup HT-specific state in a node. Called only
1047 * when HT use has been marked.
1048 */
1049 void
1050 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1051 {
1052 struct ieee80211com *ic = ni->ni_ic;
1053 int i;
1054
1055 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1056
1057 /* XXX optimize this */
1058 for (i = 0; i < WME_NUM_AC; i++) {
1059 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1060 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1061 ampdu_tx_stop(tap);
1062 }
1063 for (i = 0; i < WME_NUM_TID; i++)
1064 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1065
1066 ni->ni_htcap = 0;
1067 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1068 }
1069
1070 /*
1071 * Age out HT resources for a station.
1072 */
1073 void
1074 ieee80211_ht_node_age(struct ieee80211_node *ni)
1075 {
1076 #ifdef IEEE80211_AMPDU_AGE
1077 struct ieee80211vap *vap = ni->ni_vap;
1078 uint8_t tid;
1079 #endif
1080
1081 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1082
1083 #ifdef IEEE80211_AMPDU_AGE
1084 for (tid = 0; tid < WME_NUM_TID; tid++) {
1085 struct ieee80211_rx_ampdu *rap;
1086
1087 rap = &ni->ni_rx_ampdu[tid];
1088 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1089 continue;
1090 if (rap->rxa_qframes == 0)
1091 continue;
1092 /*
1093 * Check for frames sitting too long in the reorder queue.
1094 * See above for more details on what's happening here.
1095 */
1096 /* XXX honor batimeout? */
1097 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1098 /*
1099 * Too long since we received the first
1100 * frame; flush the reorder buffer.
1101 */
1102 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1103 ampdu_rx_flush(ni, rap);
1104 }
1105 }
1106 #endif /* IEEE80211_AMPDU_AGE */
1107 }
1108
1109 static struct ieee80211_channel *
1110 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1111 {
1112 return ieee80211_find_channel(ic, c->ic_freq,
1113 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1114 }
1115
1116 /*
1117 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1118 */
1119 struct ieee80211_channel *
1120 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1121 struct ieee80211_channel *chan, int flags)
1122 {
1123 struct ieee80211_channel *c;
1124
1125 if (flags & IEEE80211_FHT_HT) {
1126 /* promote to HT if possible */
1127 if (flags & IEEE80211_FHT_USEHT40) {
1128 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1129 /* NB: arbitrarily pick ht40+ over ht40- */
1130 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1131 if (c == NULL)
1132 c = findhtchan(ic, chan,
1133 IEEE80211_CHAN_HT40D);
1134 if (c == NULL)
1135 c = findhtchan(ic, chan,
1136 IEEE80211_CHAN_HT20);
1137 if (c != NULL)
1138 chan = c;
1139 }
1140 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1141 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1142 if (c != NULL)
1143 chan = c;
1144 }
1145 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1146 /* demote to legacy, HT use is disabled */
1147 c = ieee80211_find_channel(ic, chan->ic_freq,
1148 chan->ic_flags &~ IEEE80211_CHAN_HT);
1149 if (c != NULL)
1150 chan = c;
1151 }
1152 return chan;
1153 }
1154
1155 /*
1156 * Setup HT-specific state for a legacy WDS peer.
1157 */
1158 void
1159 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1160 {
1161 struct ieee80211vap *vap = ni->ni_vap;
1162 struct ieee80211_tx_ampdu *tap;
1163 int ac;
1164
1165 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1166
1167 /* XXX check scan cache in case peer has an ap and we have info */
1168 /*
1169 * If setup with a legacy channel; locate an HT channel.
1170 * Otherwise if the inherited channel (from a companion
1171 * AP) is suitable use it so we use the same location
1172 * for the extension channel).
1173 */
1174 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1175 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1176
1177 ni->ni_htcap = 0;
1178 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1179 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1180 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1181 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1182 ni->ni_chw = 40;
1183 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1184 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1185 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1186 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1187 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1188 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1189 } else {
1190 ni->ni_chw = 20;
1191 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1192 }
1193 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1194 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1195 ni->ni_flags |= IEEE80211_NODE_RIFS;
1196 /* XXX does it make sense to enable SMPS? */
1197
1198 ni->ni_htopmode = 0; /* XXX need protection state */
1199 ni->ni_htstbc = 0; /* XXX need info */
1200
1201 for (ac = 0; ac < WME_NUM_AC; ac++) {
1202 tap = &ni->ni_tx_ampdu[ac];
1203 tap->txa_ac = ac;
1204 }
1205 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1206 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1207 }
1208
1209 /*
1210 * Notify hostap vaps of a change in the HTINFO ie.
1211 */
1212 static void
1213 htinfo_notify(struct ieee80211com *ic)
1214 {
1215 struct ieee80211vap *vap;
1216 int first = 1;
1217
1218 IEEE80211_LOCK_ASSERT(ic);
1219
1220 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1221 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1222 continue;
1223 if (vap->iv_state != IEEE80211_S_RUN ||
1224 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1225 continue;
1226 if (first) {
1227 IEEE80211_NOTE(vap,
1228 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1229 vap->iv_bss,
1230 "HT bss occupancy change: %d sta, %d ht, "
1231 "%d ht40%s, HT protmode now 0x%x"
1232 , ic->ic_sta_assoc
1233 , ic->ic_ht_sta_assoc
1234 , ic->ic_ht40_sta_assoc
1235 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1236 ", non-HT sta present" : ""
1237 , ic->ic_curhtprotmode);
1238 first = 0;
1239 }
1240 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1241 }
1242 }
1243
1244 /*
1245 * Calculate HT protection mode from current
1246 * state and handle updates.
1247 */
1248 static void
1249 htinfo_update(struct ieee80211com *ic)
1250 {
1251 uint8_t protmode;
1252
1253 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1254 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1255 | IEEE80211_HTINFO_NONHT_PRESENT;
1256 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1257 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1258 | IEEE80211_HTINFO_NONHT_PRESENT;
1259 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1260 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1261 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1262 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1263 } else {
1264 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1265 }
1266 if (protmode != ic->ic_curhtprotmode) {
1267 ic->ic_curhtprotmode = protmode;
1268 htinfo_notify(ic);
1269 }
1270 }
1271
1272 /*
1273 * Handle an HT station joining a BSS.
1274 */
1275 void
1276 ieee80211_ht_node_join(struct ieee80211_node *ni)
1277 {
1278 struct ieee80211com *ic = ni->ni_ic;
1279
1280 IEEE80211_LOCK_ASSERT(ic);
1281
1282 if (ni->ni_flags & IEEE80211_NODE_HT) {
1283 ic->ic_ht_sta_assoc++;
1284 if (ni->ni_chw == 40)
1285 ic->ic_ht40_sta_assoc++;
1286 }
1287 htinfo_update(ic);
1288 }
1289
1290 /*
1291 * Handle an HT station leaving a BSS.
1292 */
1293 void
1294 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1295 {
1296 struct ieee80211com *ic = ni->ni_ic;
1297
1298 IEEE80211_LOCK_ASSERT(ic);
1299
1300 if (ni->ni_flags & IEEE80211_NODE_HT) {
1301 ic->ic_ht_sta_assoc--;
1302 if (ni->ni_chw == 40)
1303 ic->ic_ht40_sta_assoc--;
1304 }
1305 htinfo_update(ic);
1306 }
1307
1308 /*
1309 * Public version of htinfo_update; used for processing
1310 * beacon frames from overlapping bss.
1311 *
1312 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1313 * (on receipt of a beacon that advertises MIXED) or
1314 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1315 * from an overlapping legacy bss). We treat MIXED with
1316 * a higher precedence than PROTOPT (i.e. we will not change
1317 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1318 * corresponds to how we handle things in htinfo_update.
1319 */
1320 void
1321 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1322 {
1323 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1324 IEEE80211_LOCK(ic);
1325
1326 /* track non-HT station presence */
1327 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1328 ("protmode 0x%x", protmode));
1329 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1330 ic->ic_lastnonht = ticks;
1331
1332 if (protmode != ic->ic_curhtprotmode &&
1333 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1334 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1335 /* push beacon update */
1336 ic->ic_curhtprotmode = protmode;
1337 htinfo_notify(ic);
1338 }
1339 IEEE80211_UNLOCK(ic);
1340 #undef OPMODE
1341 }
1342
1343 /*
1344 * Time out presence of an overlapping bss with non-HT
1345 * stations. When operating in hostap mode we listen for
1346 * beacons from other stations and if we identify a non-HT
1347 * station is present we update the opmode field of the
1348 * HTINFO ie. To identify when all non-HT stations are
1349 * gone we time out this condition.
1350 */
1351 void
1352 ieee80211_ht_timeout(struct ieee80211com *ic)
1353 {
1354 IEEE80211_LOCK_ASSERT(ic);
1355
1356 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1357 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1358 #if 0
1359 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1360 "%s", "time out non-HT STA present on channel");
1361 #endif
1362 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1363 htinfo_update(ic);
1364 }
1365 }
1366
1367 /* unalligned little endian access */
1368 #define LE_READ_2(p) \
1369 ((uint16_t) \
1370 ((((const uint8_t *)(p))[0] ) | \
1371 (((const uint8_t *)(p))[1] << 8)))
1372
1373 /*
1374 * Process an 802.11n HT capabilities ie.
1375 */
1376 void
1377 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1378 {
1379 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1380 /*
1381 * Station used Vendor OUI ie to associate;
1382 * mark the node so when we respond we'll use
1383 * the Vendor OUI's and not the standard ie's.
1384 */
1385 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1386 ie += 4;
1387 } else
1388 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1389
1390 ni->ni_htcap = LE_READ_2(ie +
1391 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1392 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1393 }
1394
1395 static void
1396 htinfo_parse(struct ieee80211_node *ni,
1397 const struct ieee80211_ie_htinfo *htinfo)
1398 {
1399 uint16_t w;
1400
1401 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1402 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1403 w = LE_READ_2(&htinfo->hi_byte2);
1404 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1405 w = LE_READ_2(&htinfo->hi_byte45);
1406 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1407 }
1408
1409 /*
1410 * Parse an 802.11n HT info ie and save useful information
1411 * to the node state. Note this does not effect any state
1412 * changes such as for channel width change.
1413 */
1414 void
1415 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1416 {
1417 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1418 ie += 4;
1419 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1420 }
1421
1422 /*
1423 * Handle 11n channel switch. Use the received HT ie's to
1424 * identify the right channel to use. If we cannot locate it
1425 * in the channel table then fallback to legacy operation.
1426 * Note that we use this information to identify the node's
1427 * channel only; the caller is responsible for insuring any
1428 * required channel change is done (e.g. in sta mode when
1429 * parsing the contents of a beacon frame).
1430 */
1431 static void
1432 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1433 {
1434 struct ieee80211com *ic = ni->ni_ic;
1435 struct ieee80211_channel *c;
1436 int chanflags;
1437
1438 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1439 if (chanflags != ni->ni_chan->ic_flags) {
1440 /* XXX not right for ht40- */
1441 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1442 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1443 /*
1444 * No HT40 channel entry in our table; fall back
1445 * to HT20 operation. This should not happen.
1446 */
1447 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1448 #if 0
1449 IEEE80211_NOTE(ni->ni_vap,
1450 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1451 "no HT40 channel (freq %u), falling back to HT20",
1452 ni->ni_chan->ic_freq);
1453 #endif
1454 /* XXX stat */
1455 }
1456 if (c != NULL && c != ni->ni_chan) {
1457 IEEE80211_NOTE(ni->ni_vap,
1458 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1459 "switch station to HT%d channel %u/0x%x",
1460 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1461 c->ic_freq, c->ic_flags);
1462 ni->ni_chan = c;
1463 }
1464 /* NB: caller responsible for forcing any channel change */
1465 }
1466 /* update node's tx channel width */
1467 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1468 }
1469
1470 /*
1471 * Update 11n MIMO PS state according to received htcap.
1472 */
1473 static __inline int
1474 htcap_update_mimo_ps(struct ieee80211_node *ni)
1475 {
1476 uint16_t oflags = ni->ni_flags;
1477
1478 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1479 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1480 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1481 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1482 break;
1483 case IEEE80211_HTCAP_SMPS_ENA:
1484 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1485 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1486 break;
1487 case IEEE80211_HTCAP_SMPS_OFF:
1488 default: /* disable on rx of reserved value */
1489 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1490 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1491 break;
1492 }
1493 return (oflags ^ ni->ni_flags);
1494 }
1495
1496 /*
1497 * Update short GI state according to received htcap
1498 * and local settings.
1499 */
1500 static __inline void
1501 htcap_update_shortgi(struct ieee80211_node *ni)
1502 {
1503 struct ieee80211vap *vap = ni->ni_vap;
1504
1505 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1506 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1507 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1508 ni->ni_flags |= IEEE80211_NODE_SGI20;
1509 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1510 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1511 ni->ni_flags |= IEEE80211_NODE_SGI40;
1512 }
1513
1514 /*
1515 * Parse and update HT-related state extracted from
1516 * the HT cap and info ie's.
1517 */
1518 void
1519 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1520 const uint8_t *htcapie, const uint8_t *htinfoie)
1521 {
1522 struct ieee80211vap *vap = ni->ni_vap;
1523 const struct ieee80211_ie_htinfo *htinfo;
1524 int htflags;
1525
1526 ieee80211_parse_htcap(ni, htcapie);
1527 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1528 htcap_update_mimo_ps(ni);
1529 htcap_update_shortgi(ni);
1530
1531 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1532 htinfoie += 4;
1533 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1534 htinfo_parse(ni, htinfo);
1535
1536 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1537 IEEE80211_CHAN_HT20 : 0;
1538 /* NB: honor operating mode constraint */
1539 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1540 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1541 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1542 htflags = IEEE80211_CHAN_HT40U;
1543 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1544 htflags = IEEE80211_CHAN_HT40D;
1545 }
1546 htinfo_update_chw(ni, htflags);
1547
1548 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1549 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1550 ni->ni_flags |= IEEE80211_NODE_RIFS;
1551 else
1552 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1553 }
1554
1555 /*
1556 * Parse and update HT-related state extracted from the HT cap ie
1557 * for a station joining an HT BSS.
1558 */
1559 void
1560 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1561 {
1562 struct ieee80211vap *vap = ni->ni_vap;
1563 int htflags;
1564
1565 ieee80211_parse_htcap(ni, htcapie);
1566 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1567 htcap_update_mimo_ps(ni);
1568 htcap_update_shortgi(ni);
1569
1570 /* NB: honor operating mode constraint */
1571 /* XXX 40 MHz intolerant */
1572 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1573 IEEE80211_CHAN_HT20 : 0;
1574 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1575 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1576 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1577 htflags = IEEE80211_CHAN_HT40U;
1578 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1579 htflags = IEEE80211_CHAN_HT40D;
1580 }
1581 htinfo_update_chw(ni, htflags);
1582 }
1583
1584 /*
1585 * Install received HT rate set by parsing the HT cap ie.
1586 */
1587 int
1588 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1589 {
1590 struct ieee80211com *ic = ni->ni_ic;
1591 struct ieee80211vap *vap = ni->ni_vap;
1592 const struct ieee80211_ie_htcap *htcap;
1593 struct ieee80211_htrateset *rs;
1594 int i, maxequalmcs, maxunequalmcs;
1595
1596 maxequalmcs = ic->ic_txstream * 8 - 1;
1597 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
1598 if (ic->ic_txstream >= 2)
1599 maxunequalmcs = 38;
1600 if (ic->ic_txstream >= 3)
1601 maxunequalmcs = 52;
1602 if (ic->ic_txstream >= 4)
1603 maxunequalmcs = 76;
1604 } else
1605 maxunequalmcs = 0;
1606
1607 rs = &ni->ni_htrates;
1608 memset(rs, 0, sizeof(*rs));
1609 if (ie != NULL) {
1610 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1611 ie += 4;
1612 htcap = (const struct ieee80211_ie_htcap *) ie;
1613 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1614 if (isclr(htcap->hc_mcsset, i))
1615 continue;
1616 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1617 IEEE80211_NOTE(vap,
1618 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1619 "WARNING, HT rate set too large; only "
1620 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1621 vap->iv_stats.is_rx_rstoobig++;
1622 break;
1623 }
1624 if (i <= 31 && i > maxequalmcs)
1625 continue;
1626 if (i == 32 &&
1627 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
1628 continue;
1629 if (i > 32 && i > maxunequalmcs)
1630 continue;
1631 rs->rs_rates[rs->rs_nrates++] = i;
1632 }
1633 }
1634 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1635 }
1636
1637 /*
1638 * Mark rates in a node's HT rate set as basic according
1639 * to the information in the supplied HT info ie.
1640 */
1641 void
1642 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1643 {
1644 const struct ieee80211_ie_htinfo *htinfo;
1645 struct ieee80211_htrateset *rs;
1646 int i, j;
1647
1648 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1649 ie += 4;
1650 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1651 rs = &ni->ni_htrates;
1652 if (rs->rs_nrates == 0) {
1653 IEEE80211_NOTE(ni->ni_vap,
1654 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1655 "%s", "WARNING, empty HT rate set");
1656 return;
1657 }
1658 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1659 if (isclr(htinfo->hi_basicmcsset, i))
1660 continue;
1661 for (j = 0; j < rs->rs_nrates; j++)
1662 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1663 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1664 }
1665 }
1666
1667 static void
1668 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1669 {
1670 callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
1671 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1672 }
1673
1674 static void
1675 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1676 {
1677 struct ieee80211_node *ni = tap->txa_ni;
1678 struct ieee80211com *ic = ni->ni_ic;
1679
1680 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1681 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
1682
1683 /*
1684 * Stop BA stream if setup so driver has a chance
1685 * to reclaim any resources it might have allocated.
1686 */
1687 ic->ic_addba_stop(ni, tap);
1688 /*
1689 * Stop any pending BAR transmit.
1690 */
1691 bar_stop_timer(tap);
1692
1693 tap->txa_lastsample = 0;
1694 tap->txa_avgpps = 0;
1695 /* NB: clearing NAK means we may re-send ADDBA */
1696 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1697 }
1698
1699 /*
1700 * ADDBA response timeout.
1701 *
1702 * If software aggregation and per-TID queue management was done here,
1703 * that queue would be unpaused after the ADDBA timeout occurs.
1704 */
1705 static void
1706 addba_timeout(void *arg)
1707 {
1708 struct ieee80211_tx_ampdu *tap = arg;
1709 struct ieee80211_node *ni = tap->txa_ni;
1710 struct ieee80211com *ic = ni->ni_ic;
1711
1712 /* XXX ? */
1713 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1714 tap->txa_attempts++;
1715 ic->ic_addba_response_timeout(ni, tap);
1716 }
1717
1718 static void
1719 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1720 {
1721 /* XXX use CALLOUT_PENDING instead? */
1722 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1723 addba_timeout, tap);
1724 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1725 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1726 }
1727
1728 static void
1729 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1730 {
1731 /* XXX use CALLOUT_PENDING instead? */
1732 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1733 callout_stop(&tap->txa_timer);
1734 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1735 }
1736 }
1737
1738 static void
1739 null_addba_response_timeout(struct ieee80211_node *ni,
1740 struct ieee80211_tx_ampdu *tap)
1741 {
1742 }
1743
1744 /*
1745 * Default method for requesting A-MPDU tx aggregation.
1746 * We setup the specified state block and start a timer
1747 * to wait for an ADDBA response frame.
1748 */
1749 static int
1750 ieee80211_addba_request(struct ieee80211_node *ni,
1751 struct ieee80211_tx_ampdu *tap,
1752 int dialogtoken, int baparamset, int batimeout)
1753 {
1754 int bufsiz;
1755
1756 /* XXX locking */
1757 tap->txa_token = dialogtoken;
1758 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1759 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1760 tap->txa_wnd = (bufsiz == 0) ?
1761 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1762 addba_start_timeout(tap);
1763 return 1;
1764 }
1765
1766 /*
1767 * Default method for processing an A-MPDU tx aggregation
1768 * response. We shutdown any pending timer and update the
1769 * state block according to the reply.
1770 */
1771 static int
1772 ieee80211_addba_response(struct ieee80211_node *ni,
1773 struct ieee80211_tx_ampdu *tap,
1774 int status, int baparamset, int batimeout)
1775 {
1776 int bufsiz, tid;
1777
1778 /* XXX locking */
1779 addba_stop_timeout(tap);
1780 if (status == IEEE80211_STATUS_SUCCESS) {
1781 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1782 /* XXX override our request? */
1783 tap->txa_wnd = (bufsiz == 0) ?
1784 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1785 /* XXX AC/TID */
1786 tid = MS(baparamset, IEEE80211_BAPS_TID);
1787 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1788 tap->txa_attempts = 0;
1789 } else {
1790 /* mark tid so we don't try again */
1791 tap->txa_flags |= IEEE80211_AGGR_NAK;
1792 }
1793 return 1;
1794 }
1795
1796 /*
1797 * Default method for stopping A-MPDU tx aggregation.
1798 * Any timer is cleared and we drain any pending frames.
1799 */
1800 static void
1801 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1802 {
1803 /* XXX locking */
1804 addba_stop_timeout(tap);
1805 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1806 /* XXX clear aggregation queue */
1807 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1808 }
1809 tap->txa_attempts = 0;
1810 }
1811
1812 /*
1813 * Process a received action frame using the default aggregation
1814 * policy. We intercept ADDBA-related frames and use them to
1815 * update our aggregation state. All other frames are passed up
1816 * for processing by ieee80211_recv_action.
1817 */
1818 static int
1819 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
1820 const struct ieee80211_frame *wh,
1821 const uint8_t *frm, const uint8_t *efrm)
1822 {
1823 struct ieee80211com *ic = ni->ni_ic;
1824 struct ieee80211vap *vap = ni->ni_vap;
1825 struct ieee80211_rx_ampdu *rap;
1826 uint8_t dialogtoken;
1827 uint16_t baparamset, batimeout, baseqctl;
1828 uint16_t args[5];
1829 int tid;
1830
1831 dialogtoken = frm[2];
1832 baparamset = LE_READ_2(frm+3);
1833 batimeout = LE_READ_2(frm+5);
1834 baseqctl = LE_READ_2(frm+7);
1835
1836 tid = MS(baparamset, IEEE80211_BAPS_TID);
1837
1838 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1839 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
1840 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
1841 dialogtoken, baparamset,
1842 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1843 batimeout,
1844 MS(baseqctl, IEEE80211_BASEQ_START),
1845 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1846
1847 rap = &ni->ni_rx_ampdu[tid];
1848
1849 /* Send ADDBA response */
1850 args[0] = dialogtoken;
1851 /*
1852 * NB: We ack only if the sta associated with HT and
1853 * the ap is configured to do AMPDU rx (the latter
1854 * violates the 11n spec and is mostly for testing).
1855 */
1856 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1857 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1858 /* XXX handle ampdu_rx_start failure */
1859 ic->ic_ampdu_rx_start(ni, rap,
1860 baparamset, batimeout, baseqctl);
1861
1862 args[1] = IEEE80211_STATUS_SUCCESS;
1863 } else {
1864 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1865 ni, "reject ADDBA request: %s",
1866 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1867 "administratively disabled" :
1868 "not negotiated for station");
1869 vap->iv_stats.is_addba_reject++;
1870 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1871 }
1872 /* XXX honor rap flags? */
1873 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1874 | SM(tid, IEEE80211_BAPS_TID)
1875 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1876 ;
1877 args[3] = 0;
1878 args[4] = 0;
1879 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1880 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1881 return 0;
1882 }
1883
1884 static int
1885 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
1886 const struct ieee80211_frame *wh,
1887 const uint8_t *frm, const uint8_t *efrm)
1888 {
1889 struct ieee80211com *ic = ni->ni_ic;
1890 struct ieee80211vap *vap = ni->ni_vap;
1891 struct ieee80211_tx_ampdu *tap;
1892 uint8_t dialogtoken, policy;
1893 uint16_t baparamset, batimeout, code;
1894 int tid, ac, bufsiz;
1895
1896 dialogtoken = frm[2];
1897 code = LE_READ_2(frm+3);
1898 baparamset = LE_READ_2(frm+5);
1899 tid = MS(baparamset, IEEE80211_BAPS_TID);
1900 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1901 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
1902 batimeout = LE_READ_2(frm+7);
1903
1904 ac = TID_TO_WME_AC(tid);
1905 tap = &ni->ni_tx_ampdu[ac];
1906 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1907 IEEE80211_DISCARD_MAC(vap,
1908 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1909 ni->ni_macaddr, "ADDBA response",
1910 "no pending ADDBA, tid %d dialogtoken %u "
1911 "code %d", tid, dialogtoken, code);
1912 vap->iv_stats.is_addba_norequest++;
1913 return 0;
1914 }
1915 if (dialogtoken != tap->txa_token) {
1916 IEEE80211_DISCARD_MAC(vap,
1917 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1918 ni->ni_macaddr, "ADDBA response",
1919 "dialogtoken mismatch: waiting for %d, "
1920 "received %d, tid %d code %d",
1921 tap->txa_token, dialogtoken, tid, code);
1922 vap->iv_stats.is_addba_badtoken++;
1923 return 0;
1924 }
1925 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
1926 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
1927 IEEE80211_DISCARD_MAC(vap,
1928 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1929 ni->ni_macaddr, "ADDBA response",
1930 "policy mismatch: expecting %s, "
1931 "received %s, tid %d code %d",
1932 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
1933 policy, tid, code);
1934 vap->iv_stats.is_addba_badpolicy++;
1935 return 0;
1936 }
1937 #if 0
1938 /* XXX we take MIN in ieee80211_addba_response */
1939 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
1940 IEEE80211_DISCARD_MAC(vap,
1941 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1942 ni->ni_macaddr, "ADDBA response",
1943 "BA window too large: max %d, "
1944 "received %d, tid %d code %d",
1945 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
1946 vap->iv_stats.is_addba_badbawinsize++;
1947 return 0;
1948 }
1949 #endif
1950 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1951 "recv ADDBA response: dialogtoken %u code %d "
1952 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
1953 dialogtoken, code, baparamset, tid, bufsiz,
1954 batimeout);
1955 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
1956 return 0;
1957 }
1958
1959 static int
1960 ht_recv_action_ba_delba(struct ieee80211_node *ni,
1961 const struct ieee80211_frame *wh,
1962 const uint8_t *frm, const uint8_t *efrm)
1963 {
1964 struct ieee80211com *ic = ni->ni_ic;
1965 struct ieee80211_rx_ampdu *rap;
1966 struct ieee80211_tx_ampdu *tap;
1967 uint16_t baparamset, code;
1968 int tid, ac;
1969
1970 baparamset = LE_READ_2(frm+2);
1971 code = LE_READ_2(frm+4);
1972
1973 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
1974
1975 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1976 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
1977 "code %d", baparamset, tid,
1978 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
1979
1980 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
1981 ac = TID_TO_WME_AC(tid);
1982 tap = &ni->ni_tx_ampdu[ac];
1983 ic->ic_addba_stop(ni, tap);
1984 } else {
1985 rap = &ni->ni_rx_ampdu[tid];
1986 ic->ic_ampdu_rx_stop(ni, rap);
1987 }
1988 return 0;
1989 }
1990
1991 static int
1992 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
1993 const struct ieee80211_frame *wh,
1994 const uint8_t *frm, const uint8_t *efrm)
1995 {
1996 int chw;
1997
1998 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
1999
2000 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2001 "%s: HT txchwidth, width %d%s",
2002 __func__, chw, ni->ni_chw != chw ? "*" : "");
2003 if (chw != ni->ni_chw) {
2004 ni->ni_chw = chw;
2005 /* XXX notify on change */
2006 }
2007 return 0;
2008 }
2009
2010 static int
2011 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2012 const struct ieee80211_frame *wh,
2013 const uint8_t *frm, const uint8_t *efrm)
2014 {
2015 const struct ieee80211_action_ht_mimopowersave *mps =
2016 (const struct ieee80211_action_ht_mimopowersave *) frm;
2017
2018 /* XXX check iv_htcaps */
2019 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2020 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2021 else
2022 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2023 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2024 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2025 else
2026 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2027 /* XXX notify on change */
2028 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2029 "%s: HT MIMO PS (%s%s)", __func__,
2030 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2031 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2032 );
2033 return 0;
2034 }
2035
2036 /*
2037 * Transmit processing.
2038 */
2039
2040 /*
2041 * Check if A-MPDU should be requested/enabled for a stream.
2042 * We require a traffic rate above a per-AC threshold and we
2043 * also handle backoff from previous failed attempts.
2044 *
2045 * Drivers may override this method to bring in information
2046 * such as link state conditions in making the decision.
2047 */
2048 static int
2049 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2050 struct ieee80211_tx_ampdu *tap)
2051 {
2052 struct ieee80211vap *vap = ni->ni_vap;
2053
2054 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
2055 return 0;
2056 /* XXX check rssi? */
2057 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2058 ticks < tap->txa_nextrequest) {
2059 /*
2060 * Don't retry too often; txa_nextrequest is set
2061 * to the minimum interval we'll retry after
2062 * ieee80211_addba_maxtries failed attempts are made.
2063 */
2064 return 0;
2065 }
2066 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2067 "enable AMPDU on %s, avgpps %d pkts %d",
2068 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
2069 return 1;
2070 }
2071
2072 /*
2073 * Request A-MPDU tx aggregation. Setup local state and
2074 * issue an ADDBA request. BA use will only happen after
2075 * the other end replies with ADDBA response.
2076 */
2077 int
2078 ieee80211_ampdu_request(struct ieee80211_node *ni,
2079 struct ieee80211_tx_ampdu *tap)
2080 {
2081 struct ieee80211com *ic = ni->ni_ic;
2082 uint16_t args[5];
2083 int tid, dialogtoken;
2084 static int tokens = 0; /* XXX */
2085
2086 /* XXX locking */
2087 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2088 /* do deferred setup of state */
2089 ampdu_tx_setup(tap);
2090 }
2091 /* XXX hack for not doing proper locking */
2092 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2093
2094 dialogtoken = (tokens+1) % 63; /* XXX */
2095 tid = WME_AC_TO_TID(tap->txa_ac);
2096 tap->txa_start = ni->ni_txseqs[tid];
2097
2098 args[0] = dialogtoken;
2099 args[1] = 0; /* NB: status code not used */
2100 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2101 | SM(tid, IEEE80211_BAPS_TID)
2102 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
2103 ;
2104 args[3] = 0; /* batimeout */
2105 /* NB: do first so there's no race against reply */
2106 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2107 /* unable to setup state, don't make request */
2108 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2109 ni, "%s: could not setup BA stream for AC %d",
2110 __func__, tap->txa_ac);
2111 /* defer next try so we don't slam the driver with requests */
2112 tap->txa_attempts = ieee80211_addba_maxtries;
2113 /* NB: check in case driver wants to override */
2114 if (tap->txa_nextrequest <= ticks)
2115 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2116 return 0;
2117 }
2118 tokens = dialogtoken; /* allocate token */
2119 /* NB: after calling ic_addba_request so driver can set txa_start */
2120 args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
2121 | SM(0, IEEE80211_BASEQ_FRAG)
2122 ;
2123 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2124 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2125 }
2126
2127 /*
2128 * Terminate an AMPDU tx stream. State is reclaimed
2129 * and the peer notified with a DelBA Action frame.
2130 */
2131 void
2132 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2133 int reason)
2134 {
2135 struct ieee80211com *ic = ni->ni_ic;
2136 struct ieee80211vap *vap = ni->ni_vap;
2137 uint16_t args[4];
2138
2139 /* XXX locking */
2140 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2141 if (IEEE80211_AMPDU_RUNNING(tap)) {
2142 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2143 ni, "%s: stop BA stream for AC %d (reason %d)",
2144 __func__, tap->txa_ac, reason);
2145 vap->iv_stats.is_ampdu_stop++;
2146
2147 ic->ic_addba_stop(ni, tap);
2148 args[0] = WME_AC_TO_TID(tap->txa_ac);
2149 args[1] = IEEE80211_DELBAPS_INIT;
2150 args[2] = reason; /* XXX reason code */
2151 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2152 IEEE80211_ACTION_BA_DELBA, args);
2153 } else {
2154 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2155 ni, "%s: BA stream for AC %d not running (reason %d)",
2156 __func__, tap->txa_ac, reason);
2157 vap->iv_stats.is_ampdu_stop_failed++;
2158 }
2159 }
2160
2161 static void
2162 bar_timeout(void *arg)
2163 {
2164 struct ieee80211_tx_ampdu *tap = arg;
2165 struct ieee80211_node *ni = tap->txa_ni;
2166
2167 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2168 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2169
2170 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2171 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2172 tap->txa_ac, tap->txa_flags, tap->txa_attempts);
2173
2174 /* guard against race with bar_tx_complete */
2175 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2176 return;
2177 /* XXX ? */
2178 if (tap->txa_attempts >= ieee80211_bar_maxtries)
2179 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2180 else
2181 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
2182 }
2183
2184 static void
2185 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2186 {
2187 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2188 }
2189
2190 static void
2191 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2192 {
2193 callout_stop(&tap->txa_timer);
2194 }
2195
2196 static void
2197 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2198 {
2199 struct ieee80211_tx_ampdu *tap = arg;
2200
2201 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2202 ni, "%s: tid %u flags 0x%x pending %d status %d",
2203 __func__, tap->txa_ac, tap->txa_flags,
2204 callout_pending(&tap->txa_timer), status);
2205
2206 /* XXX locking */
2207 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2208 callout_pending(&tap->txa_timer)) {
2209 struct ieee80211com *ic = ni->ni_ic;
2210
2211 if (status == 0) /* ACK'd */
2212 bar_stop_timer(tap);
2213 ic->ic_bar_response(ni, tap, status);
2214 /* NB: just let timer expire so we pace requests */
2215 }
2216 }
2217
2218 static void
2219 ieee80211_bar_response(struct ieee80211_node *ni,
2220 struct ieee80211_tx_ampdu *tap, int status)
2221 {
2222
2223 if (status == 0) { /* got ACK */
2224 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2225 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2226 tap->txa_start,
2227 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2228 tap->txa_qframes, tap->txa_seqpending,
2229 WME_AC_TO_TID(tap->txa_ac));
2230
2231 /* NB: timer already stopped in bar_tx_complete */
2232 tap->txa_start = tap->txa_seqpending;
2233 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2234 }
2235 }
2236
2237 /*
2238 * Transmit a BAR frame to the specified node. The
2239 * BAR contents are drawn from the supplied aggregation
2240 * state associated with the node.
2241 *
2242 * NB: we only handle immediate ACK w/ compressed bitmap.
2243 */
2244 int
2245 ieee80211_send_bar(struct ieee80211_node *ni,
2246 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2247 {
2248 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2249 struct ieee80211vap *vap = ni->ni_vap;
2250 struct ieee80211com *ic = ni->ni_ic;
2251 struct ieee80211_frame_bar *bar;
2252 struct mbuf *m;
2253 uint16_t barctl, barseqctl;
2254 uint8_t *frm;
2255 int tid, ret;
2256
2257 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2258 /* no ADDBA response, should not happen */
2259 /* XXX stat+msg */
2260 return EINVAL;
2261 }
2262 /* XXX locking */
2263 bar_stop_timer(tap);
2264
2265 ieee80211_ref_node(ni);
2266
2267 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2268 if (m == NULL)
2269 senderr(ENOMEM, is_tx_nobuf);
2270
2271 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2272 m_freem(m);
2273 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2274 /* NOTREACHED */
2275 }
2276
2277 bar = mtod(m, struct ieee80211_frame_bar *);
2278 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2279 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2280 bar->i_fc[1] = 0;
2281 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2282 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2283
2284 tid = WME_AC_TO_TID(tap->txa_ac);
2285 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2286 0 : IEEE80211_BAR_NOACK)
2287 | IEEE80211_BAR_COMP
2288 | SM(tid, IEEE80211_BAR_TID)
2289 ;
2290 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2291 /* NB: known to have proper alignment */
2292 bar->i_ctl = htole16(barctl);
2293 bar->i_seq = htole16(barseqctl);
2294 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2295
2296 M_WME_SETAC(m, WME_AC_VO);
2297
2298 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2299
2300 /* XXX locking */
2301 /* init/bump attempts counter */
2302 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2303 tap->txa_attempts = 1;
2304 else
2305 tap->txa_attempts++;
2306 tap->txa_seqpending = seq;
2307 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2308
2309 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2310 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2311 tid, barctl, seq, tap->txa_attempts);
2312
2313 /*
2314 * ic_raw_xmit will free the node reference
2315 * regardless of queue/TX success or failure.
2316 */
2317 ret = ic->ic_raw_xmit(ni, m, NULL);
2318 if (ret != 0) {
2319 /* xmit failed, clear state flag */
2320 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2321 return ret;
2322 }
2323 /* XXX hack against tx complete happening before timer is started */
2324 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2325 bar_start_timer(tap);
2326 return 0;
2327 bad:
2328 ieee80211_free_node(ni);
2329 return ret;
2330 #undef senderr
2331 }
2332
2333 static int
2334 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
2335 {
2336 struct ieee80211_bpf_params params;
2337
2338 memset(¶ms, 0, sizeof(params));
2339 params.ibp_pri = WME_AC_VO;
2340 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2341 /* NB: we know all frames are unicast */
2342 params.ibp_try0 = ni->ni_txparms->maxretry;
2343 params.ibp_power = ni->ni_txpower;
2344 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2345 ¶ms);
2346 }
2347
2348 #define ADDSHORT(frm, v) do { \
2349 frm[0] = (v) & 0xff; \
2350 frm[1] = (v) >> 8; \
2351 frm += 2; \
2352 } while (0)
2353
2354 /*
2355 * Send an action management frame. The arguments are stuff
2356 * into a frame without inspection; the caller is assumed to
2357 * prepare them carefully (e.g. based on the aggregation state).
2358 */
2359 static int
2360 ht_send_action_ba_addba(struct ieee80211_node *ni,
2361 int category, int action, void *arg0)
2362 {
2363 struct ieee80211vap *vap = ni->ni_vap;
2364 struct ieee80211com *ic = ni->ni_ic;
2365 uint16_t *args = arg0;
2366 struct mbuf *m;
2367 uint8_t *frm;
2368
2369 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2370 "send ADDBA %s: dialogtoken %d status %d "
2371 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2372 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
2373 "request" : "response",
2374 args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
2375 args[3], args[4]);
2376
2377 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2378 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2379 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2380 ieee80211_ref_node(ni);
2381
2382 m = ieee80211_getmgtframe(&frm,
2383 ic->ic_headroom + sizeof(struct ieee80211_frame),
2384 sizeof(uint16_t) /* action+category */
2385 /* XXX may action payload */
2386 + sizeof(struct ieee80211_action_ba_addbaresponse)
2387 );
2388 if (m != NULL) {
2389 *frm++ = category;
2390 *frm++ = action;
2391 *frm++ = args[0]; /* dialog token */
2392 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
2393 ADDSHORT(frm, args[1]); /* status code */
2394 ADDSHORT(frm, args[2]); /* baparamset */
2395 ADDSHORT(frm, args[3]); /* batimeout */
2396 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
2397 ADDSHORT(frm, args[4]); /* baseqctl */
2398 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2399 return ht_action_output(ni, m);
2400 } else {
2401 vap->iv_stats.is_tx_nobuf++;
2402 ieee80211_free_node(ni);
2403 return ENOMEM;
2404 }
2405 }
2406
2407 static int
2408 ht_send_action_ba_delba(struct ieee80211_node *ni,
2409 int category, int action, void *arg0)
2410 {
2411 struct ieee80211vap *vap = ni->ni_vap;
2412 struct ieee80211com *ic = ni->ni_ic;
2413 uint16_t *args = arg0;
2414 struct mbuf *m;
2415 uint16_t baparamset;
2416 uint8_t *frm;
2417
2418 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2419 | args[1]
2420 ;
2421 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2422 "send DELBA action: tid %d, initiator %d reason %d",
2423 args[0], args[1], args[2]);
2424
2425 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2426 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2427 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2428 ieee80211_ref_node(ni);
2429
2430 m = ieee80211_getmgtframe(&frm,
2431 ic->ic_headroom + sizeof(struct ieee80211_frame),
2432 sizeof(uint16_t) /* action+category */
2433 /* XXX may action payload */
2434 + sizeof(struct ieee80211_action_ba_addbaresponse)
2435 );
2436 if (m != NULL) {
2437 *frm++ = category;
2438 *frm++ = action;
2439 ADDSHORT(frm, baparamset);
2440 ADDSHORT(frm, args[2]); /* reason code */
2441 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2442 return ht_action_output(ni, m);
2443 } else {
2444 vap->iv_stats.is_tx_nobuf++;
2445 ieee80211_free_node(ni);
2446 return ENOMEM;
2447 }
2448 }
2449
2450 static int
2451 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
2452 int category, int action, void *arg0)
2453 {
2454 struct ieee80211vap *vap = ni->ni_vap;
2455 struct ieee80211com *ic = ni->ni_ic;
2456 struct mbuf *m;
2457 uint8_t *frm;
2458
2459 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2460 "send HT txchwidth: width %d",
2461 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
2462
2463 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2464 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2465 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2466 ieee80211_ref_node(ni);
2467
2468 m = ieee80211_getmgtframe(&frm,
2469 ic->ic_headroom + sizeof(struct ieee80211_frame),
2470 sizeof(uint16_t) /* action+category */
2471 /* XXX may action payload */
2472 + sizeof(struct ieee80211_action_ba_addbaresponse)
2473 );
2474 if (m != NULL) {
2475 *frm++ = category;
2476 *frm++ = action;
2477 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2478 IEEE80211_A_HT_TXCHWIDTH_2040 :
2479 IEEE80211_A_HT_TXCHWIDTH_20;
2480 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2481 return ht_action_output(ni, m);
2482 } else {
2483 vap->iv_stats.is_tx_nobuf++;
2484 ieee80211_free_node(ni);
2485 return ENOMEM;
2486 }
2487 }
2488 #undef ADDSHORT
2489
2490 /*
2491 * Construct the MCS bit mask for inclusion in an HT capabilities
2492 * information element.
2493 */
2494 static void
2495 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
2496 {
2497 int i;
2498 uint8_t txparams;
2499
2500 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
2501 ("ic_rxstream %d out of range", ic->ic_rxstream));
2502 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
2503 ("ic_txstream %d out of range", ic->ic_txstream));
2504
2505 for (i = 0; i < ic->ic_rxstream * 8; i++)
2506 setbit(frm, i);
2507 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
2508 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
2509 setbit(frm, 32);
2510 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
2511 if (ic->ic_rxstream >= 2) {
2512 for (i = 33; i <= 38; i++)
2513 setbit(frm, i);
2514 }
2515 if (ic->ic_rxstream >= 3) {
2516 for (i = 39; i <= 52; i++)
2517 setbit(frm, i);
2518 }
2519 if (ic->ic_txstream >= 4) {
2520 for (i = 53; i <= 76; i++)
2521 setbit(frm, i);
2522 }
2523 }
2524
2525 if (ic->ic_rxstream != ic->ic_txstream) {
2526 txparams = 0x1; /* TX MCS set defined */
2527 txparams |= 0x2; /* TX RX MCS not equal */
2528 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
2529 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
2530 txparams |= 0x16; /* TX unequal modulation sup */
2531 } else
2532 txparams = 0;
2533 frm[12] = txparams;
2534 }
2535
2536 /*
2537 * Add body of an HTCAP information element.
2538 */
2539 static uint8_t *
2540 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2541 {
2542 #define ADDSHORT(frm, v) do { \
2543 frm[0] = (v) & 0xff; \
2544 frm[1] = (v) >> 8; \
2545 frm += 2; \
2546 } while (0)
2547 struct ieee80211com *ic = ni->ni_ic;
2548 struct ieee80211vap *vap = ni->ni_vap;
2549 uint16_t caps, extcaps;
2550 int rxmax, density;
2551
2552 /* HT capabilities */
2553 caps = vap->iv_htcaps & 0xffff;
2554 /*
2555 * Note channel width depends on whether we are operating as
2556 * a sta or not. When operating as a sta we are generating
2557 * a request based on our desired configuration. Otherwise
2558 * we are operational and the channel attributes identify
2559 * how we've been setup (which might be different if a fixed
2560 * channel is specified).
2561 */
2562 if (vap->iv_opmode == IEEE80211_M_STA) {
2563 /* override 20/40 use based on config */
2564 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2565 caps |= IEEE80211_HTCAP_CHWIDTH40;
2566 else
2567 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2568 /* use advertised setting (XXX locally constraint) */
2569 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2570 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2571
2572 /*
2573 * NB: Hardware might support HT40 on some but not all
2574 * channels. We can't determine this earlier because only
2575 * after association the channel is upgraded to HT based
2576 * on the negotiated capabilities.
2577 */
2578 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
2579 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
2580 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
2581 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2582 } else {
2583 /* override 20/40 use based on current channel */
2584 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2585 caps |= IEEE80211_HTCAP_CHWIDTH40;
2586 else
2587 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2588 rxmax = vap->iv_ampdu_rxmax;
2589 density = vap->iv_ampdu_density;
2590 }
2591 /* adjust short GI based on channel and config */
2592 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2593 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2594 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2595 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2596 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2597 ADDSHORT(frm, caps);
2598
2599 /* HT parameters */
2600 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2601 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2602 ;
2603 frm++;
2604
2605 /* pre-zero remainder of ie */
2606 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2607 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2608
2609 /* supported MCS set */
2610 /*
2611 * XXX: For sta mode the rate set should be restricted based
2612 * on the AP's capabilities, but ni_htrates isn't setup when
2613 * we're called to form an AssocReq frame so for now we're
2614 * restricted to the device capabilities.
2615 */
2616 ieee80211_set_mcsset(ni->ni_ic, frm);
2617
2618 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
2619 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2620
2621 /* HT extended capabilities */
2622 extcaps = vap->iv_htextcaps & 0xffff;
2623
2624 ADDSHORT(frm, extcaps);
2625
2626 frm += sizeof(struct ieee80211_ie_htcap) -
2627 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
2628
2629 return frm;
2630 #undef ADDSHORT
2631 }
2632
2633 /*
2634 * Add 802.11n HT capabilities information element
2635 */
2636 uint8_t *
2637 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2638 {
2639 frm[0] = IEEE80211_ELEMID_HTCAP;
2640 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2641 return ieee80211_add_htcap_body(frm + 2, ni);
2642 }
2643
2644 /*
2645 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2646 * used for compatibility w/ pre-draft implementations.
2647 */
2648 uint8_t *
2649 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2650 {
2651 frm[0] = IEEE80211_ELEMID_VENDOR;
2652 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2653 frm[2] = (BCM_OUI >> 0) & 0xff;
2654 frm[3] = (BCM_OUI >> 8) & 0xff;
2655 frm[4] = (BCM_OUI >> 16) & 0xff;
2656 frm[5] = BCM_OUI_HTCAP;
2657 return ieee80211_add_htcap_body(frm + 6, ni);
2658 }
2659
2660 /*
2661 * Construct the MCS bit mask of basic rates
2662 * for inclusion in an HT information element.
2663 */
2664 static void
2665 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2666 {
2667 int i;
2668
2669 for (i = 0; i < rs->rs_nrates; i++) {
2670 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2671 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2672 r < IEEE80211_HTRATE_MAXSIZE) {
2673 /* NB: this assumes a particular implementation */
2674 setbit(frm, r);
2675 }
2676 }
2677 }
2678
2679 /*
2680 * Update the HTINFO ie for a beacon frame.
2681 */
2682 void
2683 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2684 struct ieee80211_beacon_offsets *bo)
2685 {
2686 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2687 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
2688 struct ieee80211com *ic = vap->iv_ic;
2689 struct ieee80211_ie_htinfo *ht =
2690 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2691
2692 /* XXX only update on channel change */
2693 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2694 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2695 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2696 else
2697 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2698 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2699 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2700 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2701 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2702 else
2703 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2704 if (IEEE80211_IS_CHAN_HT40(bsschan))
2705 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2706
2707 /* protection mode */
2708 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2709
2710 /* XXX propagate to vendor ie's */
2711 #undef PROTMODE
2712 }
2713
2714 /*
2715 * Add body of an HTINFO information element.
2716 *
2717 * NB: We don't use struct ieee80211_ie_htinfo because we can
2718 * be called to fillin both a standard ie and a compat ie that
2719 * has a vendor OUI at the front.
2720 */
2721 static uint8_t *
2722 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2723 {
2724 struct ieee80211vap *vap = ni->ni_vap;
2725 struct ieee80211com *ic = ni->ni_ic;
2726
2727 /* pre-zero remainder of ie */
2728 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2729
2730 /* primary/control channel center */
2731 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2732
2733 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2734 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2735 else
2736 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2737 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2738 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2739 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2740 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2741 else
2742 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2743 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2744 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2745
2746 frm[1] = ic->ic_curhtprotmode;
2747
2748 frm += 5;
2749
2750 /* basic MCS set */
2751 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2752 frm += sizeof(struct ieee80211_ie_htinfo) -
2753 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2754 return frm;
2755 }
2756
2757 /*
2758 * Add 802.11n HT information information element.
2759 */
2760 uint8_t *
2761 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2762 {
2763 frm[0] = IEEE80211_ELEMID_HTINFO;
2764 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2765 return ieee80211_add_htinfo_body(frm + 2, ni);
2766 }
2767
2768 /*
2769 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2770 * used for compatibility w/ pre-draft implementations.
2771 */
2772 uint8_t *
2773 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2774 {
2775 frm[0] = IEEE80211_ELEMID_VENDOR;
2776 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2777 frm[2] = (BCM_OUI >> 0) & 0xff;
2778 frm[3] = (BCM_OUI >> 8) & 0xff;
2779 frm[4] = (BCM_OUI >> 16) & 0xff;
2780 frm[5] = BCM_OUI_HTINFO;
2781 return ieee80211_add_htinfo_body(frm + 6, ni);
2782 }
Cache object: b1f772d6bed66029f4dc774ad5d7459b
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