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: releng/9.0/sys/net80211/ieee80211_ht.c 225013 2011-08-19 15:21:13Z adrian $");
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, CTLTYPE_INT | 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, int mode, int ratetype)
311 {
312 int mword, rate;
313
314 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
315 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
316 return (0);
317 switch (ratetype) {
318 case 0:
319 rate = ieee80211_htrates[index].ht20_rate_800ns;
320 break;
321 case 1:
322 rate = ieee80211_htrates[index].ht20_rate_400ns;
323 break;
324 case 2:
325 rate = ieee80211_htrates[index].ht40_rate_800ns;
326 break;
327 default:
328 rate = ieee80211_htrates[index].ht40_rate_400ns;
329 break;
330 }
331 return (rate);
332 }
333
334 static struct printranges {
335 int minmcs;
336 int maxmcs;
337 int txstream;
338 int ratetype;
339 int htcapflags;
340 } ranges[] = {
341 { 0, 7, 1, 0, 0 },
342 { 8, 15, 2, 0, 0 },
343 { 16, 23, 3, 0, 0 },
344 { 24, 31, 4, 0, 0 },
345 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
346 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
347 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
348 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
349 { 0, 0, 0, 0, 0 },
350 };
351
352 static void
353 ht_rateprint(struct ieee80211com *ic, int mode, int ratetype)
354 {
355 struct ifnet *ifp = ic->ic_ifp;
356 int minrate, maxrate;
357 struct printranges *range;
358
359 for (range = ranges; range->txstream != 0; range++) {
360 if (ic->ic_txstream < range->txstream)
361 continue;
362 if (range->htcapflags &&
363 (ic->ic_htcaps & range->htcapflags) == 0)
364 continue;
365 if (ratetype < range->ratetype)
366 continue;
367 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
368 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
369 if (range->maxmcs) {
370 if_printf(ifp, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
371 range->minmcs, range->maxmcs,
372 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
373 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
374 } else {
375 if_printf(ifp, "MCS %d: %d%sMbps\n", range->minmcs,
376 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
377 }
378 }
379 }
380
381 static void
382 ht_announce(struct ieee80211com *ic, int mode)
383 {
384 struct ifnet *ifp = ic->ic_ifp;
385 const char *modestr = ieee80211_phymode_name[mode];
386
387 if_printf(ifp, "%s MCS 20MHz\n", modestr);
388 ht_rateprint(ic, mode, 0);
389 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
390 if_printf(ifp, "%s MCS 20MHz SGI\n", modestr);
391 ht_rateprint(ic, mode, 1);
392 }
393 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
394 if_printf(ifp, "%s MCS 40MHz:\n", modestr);
395 ht_rateprint(ic, mode, 2);
396 }
397 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
398 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
399 if_printf(ifp, "%s MCS 40MHz SGI:\n", modestr);
400 ht_rateprint(ic, mode, 3);
401 }
402 }
403
404 void
405 ieee80211_ht_announce(struct ieee80211com *ic)
406 {
407 struct ifnet *ifp = ic->ic_ifp;
408
409 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
410 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
411 if_printf(ifp, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
412 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
413 ht_announce(ic, IEEE80211_MODE_11NA);
414 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
415 ht_announce(ic, IEEE80211_MODE_11NG);
416 }
417
418 static struct ieee80211_htrateset htrateset;
419
420 const struct ieee80211_htrateset *
421 ieee80211_get_suphtrates(struct ieee80211com *ic,
422 const struct ieee80211_channel *c)
423 {
424 #define ADDRATE(x) do { \
425 htrateset.rs_rates[htrateset.rs_nrates] = x; \
426 htrateset.rs_nrates++; \
427 } while (0)
428 int i;
429
430 memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
431 for (i = 0; i < ic->ic_txstream * 8; i++)
432 ADDRATE(i);
433 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
434 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
435 ADDRATE(i);
436 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
437 if (ic->ic_txstream >= 2) {
438 for (i = 33; i <= 38; i++)
439 ADDRATE(i);
440 }
441 if (ic->ic_txstream >= 3) {
442 for (i = 39; i <= 52; i++)
443 ADDRATE(i);
444 }
445 if (ic->ic_txstream == 4) {
446 for (i = 53; i <= 76; i++)
447 ADDRATE(i);
448 }
449 }
450 return &htrateset;
451 #undef ADDRATE
452 }
453
454 /*
455 * Receive processing.
456 */
457
458 /*
459 * Decap the encapsulated A-MSDU frames and dispatch all but
460 * the last for delivery. The last frame is returned for
461 * delivery via the normal path.
462 */
463 struct mbuf *
464 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
465 {
466 struct ieee80211vap *vap = ni->ni_vap;
467 int framelen;
468 struct mbuf *n;
469
470 /* discard 802.3 header inserted by ieee80211_decap */
471 m_adj(m, sizeof(struct ether_header));
472
473 vap->iv_stats.is_amsdu_decap++;
474
475 for (;;) {
476 /*
477 * Decap the first frame, bust it apart from the
478 * remainder and deliver. We leave the last frame
479 * delivery to the caller (for consistency with other
480 * code paths, could also do it here).
481 */
482 m = ieee80211_decap1(m, &framelen);
483 if (m == NULL) {
484 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
485 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
486 vap->iv_stats.is_amsdu_tooshort++;
487 return NULL;
488 }
489 if (m->m_pkthdr.len == framelen)
490 break;
491 n = m_split(m, framelen, M_NOWAIT);
492 if (n == NULL) {
493 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
494 ni->ni_macaddr, "a-msdu",
495 "%s", "unable to split encapsulated frames");
496 vap->iv_stats.is_amsdu_split++;
497 m_freem(m); /* NB: must reclaim */
498 return NULL;
499 }
500 vap->iv_deliver_data(vap, ni, m);
501
502 /*
503 * Remove frame contents; each intermediate frame
504 * is required to be aligned to a 4-byte boundary.
505 */
506 m = n;
507 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
508 }
509 return m; /* last delivered by caller */
510 }
511
512 /*
513 * Purge all frames in the A-MPDU re-order queue.
514 */
515 static void
516 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
517 {
518 struct mbuf *m;
519 int i;
520
521 for (i = 0; i < rap->rxa_wnd; i++) {
522 m = rap->rxa_m[i];
523 if (m != NULL) {
524 rap->rxa_m[i] = NULL;
525 rap->rxa_qbytes -= m->m_pkthdr.len;
526 m_freem(m);
527 if (--rap->rxa_qframes == 0)
528 break;
529 }
530 }
531 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
532 ("lost %u data, %u frames on ampdu rx q",
533 rap->rxa_qbytes, rap->rxa_qframes));
534 }
535
536 /*
537 * Start A-MPDU rx/re-order processing for the specified TID.
538 */
539 static int
540 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
541 int baparamset, int batimeout, int baseqctl)
542 {
543 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
544
545 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
546 /*
547 * AMPDU previously setup and not terminated with a DELBA,
548 * flush the reorder q's in case anything remains.
549 */
550 ampdu_rx_purge(rap);
551 }
552 memset(rap, 0, sizeof(*rap));
553 rap->rxa_wnd = (bufsiz == 0) ?
554 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
555 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
556 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
557
558 return 0;
559 }
560
561 /*
562 * Stop A-MPDU rx processing for the specified TID.
563 */
564 static void
565 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
566 {
567
568 ampdu_rx_purge(rap);
569 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
570 }
571
572 /*
573 * Dispatch a frame from the A-MPDU reorder queue. The
574 * frame is fed back into ieee80211_input marked with an
575 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
576 * permits ieee80211_input to optimize re-processing).
577 */
578 static __inline void
579 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
580 {
581 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
582 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
583 (void) ieee80211_input(ni, m, 0, 0);
584 }
585
586 /*
587 * Dispatch as many frames as possible from the re-order queue.
588 * Frames will always be "at the front"; we process all frames
589 * up to the first empty slot in the window. On completion we
590 * cleanup state if there are still pending frames in the current
591 * BA window. We assume the frame at slot 0 is already handled
592 * by the caller; we always start at slot 1.
593 */
594 static void
595 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
596 {
597 struct ieee80211vap *vap = ni->ni_vap;
598 struct mbuf *m;
599 int i;
600
601 /* flush run of frames */
602 for (i = 1; i < rap->rxa_wnd; i++) {
603 m = rap->rxa_m[i];
604 if (m == NULL)
605 break;
606 rap->rxa_m[i] = NULL;
607 rap->rxa_qbytes -= m->m_pkthdr.len;
608 rap->rxa_qframes--;
609
610 ampdu_dispatch(ni, m);
611 }
612 /*
613 * If frames remain, copy the mbuf pointers down so
614 * they correspond to the offsets in the new window.
615 */
616 if (rap->rxa_qframes != 0) {
617 int n = rap->rxa_qframes, j;
618 for (j = i+1; j < rap->rxa_wnd; j++) {
619 if (rap->rxa_m[j] != NULL) {
620 rap->rxa_m[j-i] = rap->rxa_m[j];
621 rap->rxa_m[j] = NULL;
622 if (--n == 0)
623 break;
624 }
625 }
626 KASSERT(n == 0, ("lost %d frames", n));
627 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
628 }
629 /*
630 * Adjust the start of the BA window to
631 * reflect the frames just dispatched.
632 */
633 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
634 vap->iv_stats.is_ampdu_rx_oor += i;
635 }
636
637 #ifdef IEEE80211_AMPDU_AGE
638 /*
639 * Dispatch all frames in the A-MPDU re-order queue.
640 */
641 static void
642 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
643 {
644 struct ieee80211vap *vap = ni->ni_vap;
645 struct mbuf *m;
646 int i;
647
648 for (i = 0; i < rap->rxa_wnd; i++) {
649 m = rap->rxa_m[i];
650 if (m == NULL)
651 continue;
652 rap->rxa_m[i] = NULL;
653 rap->rxa_qbytes -= m->m_pkthdr.len;
654 rap->rxa_qframes--;
655 vap->iv_stats.is_ampdu_rx_oor++;
656
657 ampdu_dispatch(ni, m);
658 if (rap->rxa_qframes == 0)
659 break;
660 }
661 }
662 #endif /* IEEE80211_AMPDU_AGE */
663
664 /*
665 * Dispatch all frames in the A-MPDU re-order queue
666 * preceding the specified sequence number. This logic
667 * handles window moves due to a received MSDU or BAR.
668 */
669 static void
670 ampdu_rx_flush_upto(struct ieee80211_node *ni,
671 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
672 {
673 struct ieee80211vap *vap = ni->ni_vap;
674 struct mbuf *m;
675 ieee80211_seq seqno;
676 int i;
677
678 /*
679 * Flush any complete MSDU's with a sequence number lower
680 * than winstart. Gaps may exist. Note that we may actually
681 * dispatch frames past winstart if a run continues; this is
682 * an optimization that avoids having to do a separate pass
683 * to dispatch frames after moving the BA window start.
684 */
685 seqno = rap->rxa_start;
686 for (i = 0; i < rap->rxa_wnd; i++) {
687 m = rap->rxa_m[i];
688 if (m != NULL) {
689 rap->rxa_m[i] = NULL;
690 rap->rxa_qbytes -= m->m_pkthdr.len;
691 rap->rxa_qframes--;
692 vap->iv_stats.is_ampdu_rx_oor++;
693
694 ampdu_dispatch(ni, m);
695 } else {
696 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
697 break;
698 }
699 seqno = IEEE80211_SEQ_INC(seqno);
700 }
701 /*
702 * If frames remain, copy the mbuf pointers down so
703 * they correspond to the offsets in the new window.
704 */
705 if (rap->rxa_qframes != 0) {
706 int n = rap->rxa_qframes, j;
707
708 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
709 KASSERT(rap->rxa_m[0] == NULL,
710 ("%s: BA window slot 0 occupied", __func__));
711 for (j = i+1; j < rap->rxa_wnd; j++) {
712 if (rap->rxa_m[j] != NULL) {
713 rap->rxa_m[j-i] = rap->rxa_m[j];
714 rap->rxa_m[j] = NULL;
715 if (--n == 0)
716 break;
717 }
718 }
719 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
720 "BA win <%d:%d> winstart %d",
721 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
722 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
723 winstart));
724 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
725 }
726 /*
727 * Move the start of the BA window; we use the
728 * sequence number of the last MSDU that was
729 * passed up the stack+1 or winstart if stopped on
730 * a gap in the reorder buffer.
731 */
732 rap->rxa_start = seqno;
733 }
734
735 /*
736 * Process a received QoS data frame for an HT station. Handle
737 * A-MPDU reordering: if this frame is received out of order
738 * and falls within the BA window hold onto it. Otherwise if
739 * this frame completes a run, flush any pending frames. We
740 * return 1 if the frame is consumed. A 0 is returned if
741 * the frame should be processed normally by the caller.
742 */
743 int
744 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
745 {
746 #define IEEE80211_FC0_QOSDATA \
747 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
748 #define PROCESS 0 /* caller should process frame */
749 #define CONSUMED 1 /* frame consumed, caller does nothing */
750 struct ieee80211vap *vap = ni->ni_vap;
751 struct ieee80211_qosframe *wh;
752 struct ieee80211_rx_ampdu *rap;
753 ieee80211_seq rxseq;
754 uint8_t tid;
755 int off;
756
757 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
758 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
759 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
760
761 /* NB: m_len known to be sufficient */
762 wh = mtod(m, struct ieee80211_qosframe *);
763 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
764 /*
765 * Not QoS data, shouldn't get here but just
766 * return it to the caller for processing.
767 */
768 return PROCESS;
769 }
770 if (IEEE80211_IS_DSTODS(wh))
771 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
772 else
773 tid = wh->i_qos[0];
774 tid &= IEEE80211_QOS_TID;
775 rap = &ni->ni_rx_ampdu[tid];
776 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
777 /*
778 * No ADDBA request yet, don't touch.
779 */
780 return PROCESS;
781 }
782 rxseq = le16toh(*(uint16_t *)wh->i_seq);
783 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
784 /*
785 * Fragments are not allowed; toss.
786 */
787 IEEE80211_DISCARD_MAC(vap,
788 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
789 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
790 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
791 vap->iv_stats.is_ampdu_rx_drop++;
792 IEEE80211_NODE_STAT(ni, rx_drop);
793 m_freem(m);
794 return CONSUMED;
795 }
796 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
797 rap->rxa_nframes++;
798 again:
799 if (rxseq == rap->rxa_start) {
800 /*
801 * First frame in window.
802 */
803 if (rap->rxa_qframes != 0) {
804 /*
805 * Dispatch as many packets as we can.
806 */
807 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
808 ampdu_dispatch(ni, m);
809 ampdu_rx_dispatch(rap, ni);
810 return CONSUMED;
811 } else {
812 /*
813 * In order; advance window and notify
814 * caller to dispatch directly.
815 */
816 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
817 return PROCESS;
818 }
819 }
820 /*
821 * Frame is out of order; store if in the BA window.
822 */
823 /* calculate offset in BA window */
824 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
825 if (off < rap->rxa_wnd) {
826 /*
827 * Common case (hopefully): in the BA window.
828 * Sec 9.10.7.6.2 a) (p.137)
829 */
830 #ifdef IEEE80211_AMPDU_AGE
831 /*
832 * Check for frames sitting too long in the reorder queue.
833 * This should only ever happen if frames are not delivered
834 * without the sender otherwise notifying us (e.g. with a
835 * BAR to move the window). Typically this happens because
836 * of vendor bugs that cause the sequence number to jump.
837 * When this happens we get a gap in the reorder queue that
838 * leaves frame sitting on the queue until they get pushed
839 * out due to window moves. When the vendor does not send
840 * BAR this move only happens due to explicit packet sends
841 *
842 * NB: we only track the time of the oldest frame in the
843 * reorder q; this means that if we flush we might push
844 * frames that still "new"; if this happens then subsequent
845 * frames will result in BA window moves which cost something
846 * but is still better than a big throughput dip.
847 */
848 if (rap->rxa_qframes != 0) {
849 /* XXX honor batimeout? */
850 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
851 /*
852 * Too long since we received the first
853 * frame; flush the reorder buffer.
854 */
855 if (rap->rxa_qframes != 0) {
856 vap->iv_stats.is_ampdu_rx_age +=
857 rap->rxa_qframes;
858 ampdu_rx_flush(ni, rap);
859 }
860 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
861 return PROCESS;
862 }
863 } else {
864 /*
865 * First frame, start aging timer.
866 */
867 rap->rxa_age = ticks;
868 }
869 #endif /* IEEE80211_AMPDU_AGE */
870 /* save packet */
871 if (rap->rxa_m[off] == NULL) {
872 rap->rxa_m[off] = m;
873 rap->rxa_qframes++;
874 rap->rxa_qbytes += m->m_pkthdr.len;
875 vap->iv_stats.is_ampdu_rx_reorder++;
876 } else {
877 IEEE80211_DISCARD_MAC(vap,
878 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
879 ni->ni_macaddr, "a-mpdu duplicate",
880 "seqno %u tid %u BA win <%u:%u>",
881 rxseq, tid, rap->rxa_start,
882 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
883 vap->iv_stats.is_rx_dup++;
884 IEEE80211_NODE_STAT(ni, rx_dup);
885 m_freem(m);
886 }
887 return CONSUMED;
888 }
889 if (off < IEEE80211_SEQ_BA_RANGE) {
890 /*
891 * Outside the BA window, but within range;
892 * flush the reorder q and move the window.
893 * Sec 9.10.7.6.2 b) (p.138)
894 */
895 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
896 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
897 rap->rxa_start,
898 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
899 rap->rxa_qframes, rxseq, tid);
900 vap->iv_stats.is_ampdu_rx_move++;
901
902 /*
903 * The spec says to flush frames up to but not including:
904 * WinStart_B = rxseq - rap->rxa_wnd + 1
905 * Then insert the frame or notify the caller to process
906 * it immediately. We can safely do this by just starting
907 * over again because we know the frame will now be within
908 * the BA window.
909 */
910 /* NB: rxa_wnd known to be >0 */
911 ampdu_rx_flush_upto(ni, rap,
912 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
913 goto again;
914 } else {
915 /*
916 * Outside the BA window and out of range; toss.
917 * Sec 9.10.7.6.2 c) (p.138)
918 */
919 IEEE80211_DISCARD_MAC(vap,
920 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
921 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
922 rap->rxa_start,
923 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
924 rap->rxa_qframes, rxseq, tid,
925 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
926 vap->iv_stats.is_ampdu_rx_drop++;
927 IEEE80211_NODE_STAT(ni, rx_drop);
928 m_freem(m);
929 return CONSUMED;
930 }
931 #undef CONSUMED
932 #undef PROCESS
933 #undef IEEE80211_FC0_QOSDATA
934 }
935
936 /*
937 * Process a BAR ctl frame. Dispatch all frames up to
938 * the sequence number of the frame. If this frame is
939 * out of range it's discarded.
940 */
941 void
942 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
943 {
944 struct ieee80211vap *vap = ni->ni_vap;
945 struct ieee80211_frame_bar *wh;
946 struct ieee80211_rx_ampdu *rap;
947 ieee80211_seq rxseq;
948 int tid, off;
949
950 if (!ieee80211_recv_bar_ena) {
951 #if 0
952 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
953 ni->ni_macaddr, "BAR", "%s", "processing disabled");
954 #endif
955 vap->iv_stats.is_ampdu_bar_bad++;
956 return;
957 }
958 wh = mtod(m0, struct ieee80211_frame_bar *);
959 /* XXX check basic BAR */
960 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
961 rap = &ni->ni_rx_ampdu[tid];
962 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
963 /*
964 * No ADDBA request yet, don't touch.
965 */
966 IEEE80211_DISCARD_MAC(vap,
967 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
968 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
969 vap->iv_stats.is_ampdu_bar_bad++;
970 return;
971 }
972 vap->iv_stats.is_ampdu_bar_rx++;
973 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
974 if (rxseq == rap->rxa_start)
975 return;
976 /* calculate offset in BA window */
977 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
978 if (off < IEEE80211_SEQ_BA_RANGE) {
979 /*
980 * Flush the reorder q up to rxseq and move the window.
981 * Sec 9.10.7.6.3 a) (p.138)
982 */
983 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
984 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
985 rap->rxa_start,
986 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
987 rap->rxa_qframes, rxseq, tid);
988 vap->iv_stats.is_ampdu_bar_move++;
989
990 ampdu_rx_flush_upto(ni, rap, rxseq);
991 if (off >= rap->rxa_wnd) {
992 /*
993 * BAR specifies a window start to the right of BA
994 * window; we must move it explicitly since
995 * ampdu_rx_flush_upto will not.
996 */
997 rap->rxa_start = rxseq;
998 }
999 } else {
1000 /*
1001 * Out of range; toss.
1002 * Sec 9.10.7.6.3 b) (p.138)
1003 */
1004 IEEE80211_DISCARD_MAC(vap,
1005 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1006 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1007 rap->rxa_start,
1008 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1009 rap->rxa_qframes, rxseq, tid,
1010 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1011 vap->iv_stats.is_ampdu_bar_oow++;
1012 IEEE80211_NODE_STAT(ni, rx_drop);
1013 }
1014 }
1015
1016 /*
1017 * Setup HT-specific state in a node. Called only
1018 * when HT use is negotiated so we don't do extra
1019 * work for temporary and/or legacy sta's.
1020 */
1021 void
1022 ieee80211_ht_node_init(struct ieee80211_node *ni)
1023 {
1024 struct ieee80211_tx_ampdu *tap;
1025 int ac;
1026
1027 if (ni->ni_flags & IEEE80211_NODE_HT) {
1028 /*
1029 * Clean AMPDU state on re-associate. This handles the case
1030 * where a station leaves w/o notifying us and then returns
1031 * before node is reaped for inactivity.
1032 */
1033 ieee80211_ht_node_cleanup(ni);
1034 }
1035 for (ac = 0; ac < WME_NUM_AC; ac++) {
1036 tap = &ni->ni_tx_ampdu[ac];
1037 tap->txa_ac = ac;
1038 tap->txa_ni = ni;
1039 /* NB: further initialization deferred */
1040 }
1041 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1042 }
1043
1044 /*
1045 * Cleanup HT-specific state in a node. Called only
1046 * when HT use has been marked.
1047 */
1048 void
1049 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1050 {
1051 struct ieee80211com *ic = ni->ni_ic;
1052 int i;
1053
1054 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1055
1056 /* XXX optimize this */
1057 for (i = 0; i < WME_NUM_AC; i++) {
1058 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1059 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1060 ampdu_tx_stop(tap);
1061 }
1062 for (i = 0; i < WME_NUM_TID; i++)
1063 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1064
1065 ni->ni_htcap = 0;
1066 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1067 }
1068
1069 /*
1070 * Age out HT resources for a station.
1071 */
1072 void
1073 ieee80211_ht_node_age(struct ieee80211_node *ni)
1074 {
1075 #ifdef IEEE80211_AMPDU_AGE
1076 struct ieee80211vap *vap = ni->ni_vap;
1077 uint8_t tid;
1078 #endif
1079
1080 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1081
1082 #ifdef IEEE80211_AMPDU_AGE
1083 for (tid = 0; tid < WME_NUM_TID; tid++) {
1084 struct ieee80211_rx_ampdu *rap;
1085
1086 rap = &ni->ni_rx_ampdu[tid];
1087 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1088 continue;
1089 if (rap->rxa_qframes == 0)
1090 continue;
1091 /*
1092 * Check for frames sitting too long in the reorder queue.
1093 * See above for more details on what's happening here.
1094 */
1095 /* XXX honor batimeout? */
1096 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1097 /*
1098 * Too long since we received the first
1099 * frame; flush the reorder buffer.
1100 */
1101 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1102 ampdu_rx_flush(ni, rap);
1103 }
1104 }
1105 #endif /* IEEE80211_AMPDU_AGE */
1106 }
1107
1108 static struct ieee80211_channel *
1109 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1110 {
1111 return ieee80211_find_channel(ic, c->ic_freq,
1112 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1113 }
1114
1115 /*
1116 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1117 */
1118 struct ieee80211_channel *
1119 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1120 struct ieee80211_channel *chan, int flags)
1121 {
1122 struct ieee80211_channel *c;
1123
1124 if (flags & IEEE80211_FHT_HT) {
1125 /* promote to HT if possible */
1126 if (flags & IEEE80211_FHT_USEHT40) {
1127 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1128 /* NB: arbitrarily pick ht40+ over ht40- */
1129 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1130 if (c == NULL)
1131 c = findhtchan(ic, chan,
1132 IEEE80211_CHAN_HT40D);
1133 if (c == NULL)
1134 c = findhtchan(ic, chan,
1135 IEEE80211_CHAN_HT20);
1136 if (c != NULL)
1137 chan = c;
1138 }
1139 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1140 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1141 if (c != NULL)
1142 chan = c;
1143 }
1144 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1145 /* demote to legacy, HT use is disabled */
1146 c = ieee80211_find_channel(ic, chan->ic_freq,
1147 chan->ic_flags &~ IEEE80211_CHAN_HT);
1148 if (c != NULL)
1149 chan = c;
1150 }
1151 return chan;
1152 }
1153
1154 /*
1155 * Setup HT-specific state for a legacy WDS peer.
1156 */
1157 void
1158 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1159 {
1160 struct ieee80211vap *vap = ni->ni_vap;
1161 struct ieee80211_tx_ampdu *tap;
1162 int ac;
1163
1164 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1165
1166 /* XXX check scan cache in case peer has an ap and we have info */
1167 /*
1168 * If setup with a legacy channel; locate an HT channel.
1169 * Otherwise if the inherited channel (from a companion
1170 * AP) is suitable use it so we use the same location
1171 * for the extension channel).
1172 */
1173 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1174 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1175
1176 ni->ni_htcap = 0;
1177 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1178 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1179 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1180 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1181 ni->ni_chw = 40;
1182 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1183 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1184 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1185 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1186 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1187 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1188 } else {
1189 ni->ni_chw = 20;
1190 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1191 }
1192 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1193 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1194 ni->ni_flags |= IEEE80211_NODE_RIFS;
1195 /* XXX does it make sense to enable SMPS? */
1196
1197 ni->ni_htopmode = 0; /* XXX need protection state */
1198 ni->ni_htstbc = 0; /* XXX need info */
1199
1200 for (ac = 0; ac < WME_NUM_AC; ac++) {
1201 tap = &ni->ni_tx_ampdu[ac];
1202 tap->txa_ac = ac;
1203 }
1204 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1205 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1206 }
1207
1208 /*
1209 * Notify hostap vaps of a change in the HTINFO ie.
1210 */
1211 static void
1212 htinfo_notify(struct ieee80211com *ic)
1213 {
1214 struct ieee80211vap *vap;
1215 int first = 1;
1216
1217 IEEE80211_LOCK_ASSERT(ic);
1218
1219 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1220 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1221 continue;
1222 if (vap->iv_state != IEEE80211_S_RUN ||
1223 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1224 continue;
1225 if (first) {
1226 IEEE80211_NOTE(vap,
1227 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1228 vap->iv_bss,
1229 "HT bss occupancy change: %d sta, %d ht, "
1230 "%d ht40%s, HT protmode now 0x%x"
1231 , ic->ic_sta_assoc
1232 , ic->ic_ht_sta_assoc
1233 , ic->ic_ht40_sta_assoc
1234 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1235 ", non-HT sta present" : ""
1236 , ic->ic_curhtprotmode);
1237 first = 0;
1238 }
1239 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1240 }
1241 }
1242
1243 /*
1244 * Calculate HT protection mode from current
1245 * state and handle updates.
1246 */
1247 static void
1248 htinfo_update(struct ieee80211com *ic)
1249 {
1250 uint8_t protmode;
1251
1252 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1253 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1254 | IEEE80211_HTINFO_NONHT_PRESENT;
1255 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1256 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1257 | IEEE80211_HTINFO_NONHT_PRESENT;
1258 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1259 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1260 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1261 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1262 } else {
1263 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1264 }
1265 if (protmode != ic->ic_curhtprotmode) {
1266 ic->ic_curhtprotmode = protmode;
1267 htinfo_notify(ic);
1268 }
1269 }
1270
1271 /*
1272 * Handle an HT station joining a BSS.
1273 */
1274 void
1275 ieee80211_ht_node_join(struct ieee80211_node *ni)
1276 {
1277 struct ieee80211com *ic = ni->ni_ic;
1278
1279 IEEE80211_LOCK_ASSERT(ic);
1280
1281 if (ni->ni_flags & IEEE80211_NODE_HT) {
1282 ic->ic_ht_sta_assoc++;
1283 if (ni->ni_chw == 40)
1284 ic->ic_ht40_sta_assoc++;
1285 }
1286 htinfo_update(ic);
1287 }
1288
1289 /*
1290 * Handle an HT station leaving a BSS.
1291 */
1292 void
1293 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1294 {
1295 struct ieee80211com *ic = ni->ni_ic;
1296
1297 IEEE80211_LOCK_ASSERT(ic);
1298
1299 if (ni->ni_flags & IEEE80211_NODE_HT) {
1300 ic->ic_ht_sta_assoc--;
1301 if (ni->ni_chw == 40)
1302 ic->ic_ht40_sta_assoc--;
1303 }
1304 htinfo_update(ic);
1305 }
1306
1307 /*
1308 * Public version of htinfo_update; used for processing
1309 * beacon frames from overlapping bss.
1310 *
1311 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1312 * (on receipt of a beacon that advertises MIXED) or
1313 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1314 * from an overlapping legacy bss). We treat MIXED with
1315 * a higher precedence than PROTOPT (i.e. we will not change
1316 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1317 * corresponds to how we handle things in htinfo_update.
1318 */
1319 void
1320 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1321 {
1322 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1323 IEEE80211_LOCK(ic);
1324
1325 /* track non-HT station presence */
1326 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1327 ("protmode 0x%x", protmode));
1328 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1329 ic->ic_lastnonht = ticks;
1330
1331 if (protmode != ic->ic_curhtprotmode &&
1332 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1333 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1334 /* push beacon update */
1335 ic->ic_curhtprotmode = protmode;
1336 htinfo_notify(ic);
1337 }
1338 IEEE80211_UNLOCK(ic);
1339 #undef OPMODE
1340 }
1341
1342 /*
1343 * Time out presence of an overlapping bss with non-HT
1344 * stations. When operating in hostap mode we listen for
1345 * beacons from other stations and if we identify a non-HT
1346 * station is present we update the opmode field of the
1347 * HTINFO ie. To identify when all non-HT stations are
1348 * gone we time out this condition.
1349 */
1350 void
1351 ieee80211_ht_timeout(struct ieee80211com *ic)
1352 {
1353 IEEE80211_LOCK_ASSERT(ic);
1354
1355 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1356 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1357 #if 0
1358 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1359 "%s", "time out non-HT STA present on channel");
1360 #endif
1361 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1362 htinfo_update(ic);
1363 }
1364 }
1365
1366 /* unalligned little endian access */
1367 #define LE_READ_2(p) \
1368 ((uint16_t) \
1369 ((((const uint8_t *)(p))[0] ) | \
1370 (((const uint8_t *)(p))[1] << 8)))
1371
1372 /*
1373 * Process an 802.11n HT capabilities ie.
1374 */
1375 void
1376 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1377 {
1378 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1379 /*
1380 * Station used Vendor OUI ie to associate;
1381 * mark the node so when we respond we'll use
1382 * the Vendor OUI's and not the standard ie's.
1383 */
1384 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1385 ie += 4;
1386 } else
1387 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1388
1389 ni->ni_htcap = LE_READ_2(ie +
1390 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1391 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1392 }
1393
1394 static void
1395 htinfo_parse(struct ieee80211_node *ni,
1396 const struct ieee80211_ie_htinfo *htinfo)
1397 {
1398 uint16_t w;
1399
1400 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1401 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1402 w = LE_READ_2(&htinfo->hi_byte2);
1403 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1404 w = LE_READ_2(&htinfo->hi_byte45);
1405 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1406 }
1407
1408 /*
1409 * Parse an 802.11n HT info ie and save useful information
1410 * to the node state. Note this does not effect any state
1411 * changes such as for channel width change.
1412 */
1413 void
1414 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1415 {
1416 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1417 ie += 4;
1418 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1419 }
1420
1421 /*
1422 * Handle 11n channel switch. Use the received HT ie's to
1423 * identify the right channel to use. If we cannot locate it
1424 * in the channel table then fallback to legacy operation.
1425 * Note that we use this information to identify the node's
1426 * channel only; the caller is responsible for insuring any
1427 * required channel change is done (e.g. in sta mode when
1428 * parsing the contents of a beacon frame).
1429 */
1430 static void
1431 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1432 {
1433 struct ieee80211com *ic = ni->ni_ic;
1434 struct ieee80211_channel *c;
1435 int chanflags;
1436
1437 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1438 if (chanflags != ni->ni_chan->ic_flags) {
1439 /* XXX not right for ht40- */
1440 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1441 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1442 /*
1443 * No HT40 channel entry in our table; fall back
1444 * to HT20 operation. This should not happen.
1445 */
1446 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1447 #if 0
1448 IEEE80211_NOTE(ni->ni_vap,
1449 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1450 "no HT40 channel (freq %u), falling back to HT20",
1451 ni->ni_chan->ic_freq);
1452 #endif
1453 /* XXX stat */
1454 }
1455 if (c != NULL && c != ni->ni_chan) {
1456 IEEE80211_NOTE(ni->ni_vap,
1457 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1458 "switch station to HT%d channel %u/0x%x",
1459 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1460 c->ic_freq, c->ic_flags);
1461 ni->ni_chan = c;
1462 }
1463 /* NB: caller responsible for forcing any channel change */
1464 }
1465 /* update node's tx channel width */
1466 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1467 }
1468
1469 /*
1470 * Update 11n MIMO PS state according to received htcap.
1471 */
1472 static __inline int
1473 htcap_update_mimo_ps(struct ieee80211_node *ni)
1474 {
1475 uint16_t oflags = ni->ni_flags;
1476
1477 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1478 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1479 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1480 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1481 break;
1482 case IEEE80211_HTCAP_SMPS_ENA:
1483 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1484 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1485 break;
1486 case IEEE80211_HTCAP_SMPS_OFF:
1487 default: /* disable on rx of reserved value */
1488 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1489 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1490 break;
1491 }
1492 return (oflags ^ ni->ni_flags);
1493 }
1494
1495 /*
1496 * Update short GI state according to received htcap
1497 * and local settings.
1498 */
1499 static __inline void
1500 htcap_update_shortgi(struct ieee80211_node *ni)
1501 {
1502 struct ieee80211vap *vap = ni->ni_vap;
1503
1504 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1505 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1506 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1507 ni->ni_flags |= IEEE80211_NODE_SGI20;
1508 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1509 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1510 ni->ni_flags |= IEEE80211_NODE_SGI40;
1511 }
1512
1513 /*
1514 * Parse and update HT-related state extracted from
1515 * the HT cap and info ie's.
1516 */
1517 void
1518 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1519 const uint8_t *htcapie, const uint8_t *htinfoie)
1520 {
1521 struct ieee80211vap *vap = ni->ni_vap;
1522 const struct ieee80211_ie_htinfo *htinfo;
1523 int htflags;
1524
1525 ieee80211_parse_htcap(ni, htcapie);
1526 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1527 htcap_update_mimo_ps(ni);
1528 htcap_update_shortgi(ni);
1529
1530 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1531 htinfoie += 4;
1532 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1533 htinfo_parse(ni, htinfo);
1534
1535 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1536 IEEE80211_CHAN_HT20 : 0;
1537 /* NB: honor operating mode constraint */
1538 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1539 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1540 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1541 htflags = IEEE80211_CHAN_HT40U;
1542 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1543 htflags = IEEE80211_CHAN_HT40D;
1544 }
1545 htinfo_update_chw(ni, htflags);
1546
1547 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1548 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1549 ni->ni_flags |= IEEE80211_NODE_RIFS;
1550 else
1551 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1552 }
1553
1554 /*
1555 * Parse and update HT-related state extracted from the HT cap ie
1556 * for a station joining an HT BSS.
1557 */
1558 void
1559 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1560 {
1561 struct ieee80211vap *vap = ni->ni_vap;
1562 int htflags;
1563
1564 ieee80211_parse_htcap(ni, htcapie);
1565 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1566 htcap_update_mimo_ps(ni);
1567 htcap_update_shortgi(ni);
1568
1569 /* NB: honor operating mode constraint */
1570 /* XXX 40 MHz intolerant */
1571 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1572 IEEE80211_CHAN_HT20 : 0;
1573 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1574 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1575 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1576 htflags = IEEE80211_CHAN_HT40U;
1577 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1578 htflags = IEEE80211_CHAN_HT40D;
1579 }
1580 htinfo_update_chw(ni, htflags);
1581 }
1582
1583 /*
1584 * Install received HT rate set by parsing the HT cap ie.
1585 */
1586 int
1587 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1588 {
1589 struct ieee80211com *ic = ni->ni_ic;
1590 struct ieee80211vap *vap = ni->ni_vap;
1591 const struct ieee80211_ie_htcap *htcap;
1592 struct ieee80211_htrateset *rs;
1593 int i, maxequalmcs, maxunequalmcs;
1594
1595 maxequalmcs = ic->ic_txstream * 8 - 1;
1596 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
1597 if (ic->ic_txstream >= 2)
1598 maxunequalmcs = 38;
1599 if (ic->ic_txstream >= 3)
1600 maxunequalmcs = 52;
1601 if (ic->ic_txstream >= 4)
1602 maxunequalmcs = 76;
1603 } else
1604 maxunequalmcs = 0;
1605
1606 rs = &ni->ni_htrates;
1607 memset(rs, 0, sizeof(*rs));
1608 if (ie != NULL) {
1609 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1610 ie += 4;
1611 htcap = (const struct ieee80211_ie_htcap *) ie;
1612 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1613 if (isclr(htcap->hc_mcsset, i))
1614 continue;
1615 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1616 IEEE80211_NOTE(vap,
1617 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1618 "WARNING, HT rate set too large; only "
1619 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1620 vap->iv_stats.is_rx_rstoobig++;
1621 break;
1622 }
1623 if (i <= 31 && i > maxequalmcs)
1624 continue;
1625 if (i == 32 &&
1626 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
1627 continue;
1628 if (i > 32 && i > maxunequalmcs)
1629 continue;
1630 rs->rs_rates[rs->rs_nrates++] = i;
1631 }
1632 }
1633 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1634 }
1635
1636 /*
1637 * Mark rates in a node's HT rate set as basic according
1638 * to the information in the supplied HT info ie.
1639 */
1640 void
1641 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1642 {
1643 const struct ieee80211_ie_htinfo *htinfo;
1644 struct ieee80211_htrateset *rs;
1645 int i, j;
1646
1647 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1648 ie += 4;
1649 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1650 rs = &ni->ni_htrates;
1651 if (rs->rs_nrates == 0) {
1652 IEEE80211_NOTE(ni->ni_vap,
1653 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1654 "%s", "WARNING, empty HT rate set");
1655 return;
1656 }
1657 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1658 if (isclr(htinfo->hi_basicmcsset, i))
1659 continue;
1660 for (j = 0; j < rs->rs_nrates; j++)
1661 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1662 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1663 }
1664 }
1665
1666 static void
1667 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1668 {
1669 callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
1670 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1671 }
1672
1673 static void
1674 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1675 {
1676 struct ieee80211_node *ni = tap->txa_ni;
1677 struct ieee80211com *ic = ni->ni_ic;
1678
1679 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1680 ("txa_flags 0x%x ac %d", tap->txa_flags, tap->txa_ac));
1681
1682 /*
1683 * Stop BA stream if setup so driver has a chance
1684 * to reclaim any resources it might have allocated.
1685 */
1686 ic->ic_addba_stop(ni, tap);
1687 /*
1688 * Stop any pending BAR transmit.
1689 */
1690 bar_stop_timer(tap);
1691
1692 tap->txa_lastsample = 0;
1693 tap->txa_avgpps = 0;
1694 /* NB: clearing NAK means we may re-send ADDBA */
1695 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1696 }
1697
1698 /*
1699 * ADDBA response timeout.
1700 *
1701 * If software aggregation and per-TID queue management was done here,
1702 * that queue would be unpaused after the ADDBA timeout occurs.
1703 */
1704 static void
1705 addba_timeout(void *arg)
1706 {
1707 struct ieee80211_tx_ampdu *tap = arg;
1708 struct ieee80211_node *ni = tap->txa_ni;
1709 struct ieee80211com *ic = ni->ni_ic;
1710
1711 /* XXX ? */
1712 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1713 tap->txa_attempts++;
1714 ic->ic_addba_response_timeout(ni, tap);
1715 }
1716
1717 static void
1718 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1719 {
1720 /* XXX use CALLOUT_PENDING instead? */
1721 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1722 addba_timeout, tap);
1723 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1724 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1725 }
1726
1727 static void
1728 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1729 {
1730 /* XXX use CALLOUT_PENDING instead? */
1731 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1732 callout_stop(&tap->txa_timer);
1733 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1734 }
1735 }
1736
1737 static void
1738 null_addba_response_timeout(struct ieee80211_node *ni,
1739 struct ieee80211_tx_ampdu *tap)
1740 {
1741 }
1742
1743 /*
1744 * Default method for requesting A-MPDU tx aggregation.
1745 * We setup the specified state block and start a timer
1746 * to wait for an ADDBA response frame.
1747 */
1748 static int
1749 ieee80211_addba_request(struct ieee80211_node *ni,
1750 struct ieee80211_tx_ampdu *tap,
1751 int dialogtoken, int baparamset, int batimeout)
1752 {
1753 int bufsiz;
1754
1755 /* XXX locking */
1756 tap->txa_token = dialogtoken;
1757 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1758 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1759 tap->txa_wnd = (bufsiz == 0) ?
1760 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1761 addba_start_timeout(tap);
1762 return 1;
1763 }
1764
1765 /*
1766 * Default method for processing an A-MPDU tx aggregation
1767 * response. We shutdown any pending timer and update the
1768 * state block according to the reply.
1769 */
1770 static int
1771 ieee80211_addba_response(struct ieee80211_node *ni,
1772 struct ieee80211_tx_ampdu *tap,
1773 int status, int baparamset, int batimeout)
1774 {
1775 int bufsiz, tid;
1776
1777 /* XXX locking */
1778 addba_stop_timeout(tap);
1779 if (status == IEEE80211_STATUS_SUCCESS) {
1780 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1781 /* XXX override our request? */
1782 tap->txa_wnd = (bufsiz == 0) ?
1783 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1784 /* XXX AC/TID */
1785 tid = MS(baparamset, IEEE80211_BAPS_TID);
1786 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1787 tap->txa_attempts = 0;
1788 } else {
1789 /* mark tid so we don't try again */
1790 tap->txa_flags |= IEEE80211_AGGR_NAK;
1791 }
1792 return 1;
1793 }
1794
1795 /*
1796 * Default method for stopping A-MPDU tx aggregation.
1797 * Any timer is cleared and we drain any pending frames.
1798 */
1799 static void
1800 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1801 {
1802 /* XXX locking */
1803 addba_stop_timeout(tap);
1804 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1805 /* XXX clear aggregation queue */
1806 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1807 }
1808 tap->txa_attempts = 0;
1809 }
1810
1811 /*
1812 * Process a received action frame using the default aggregation
1813 * policy. We intercept ADDBA-related frames and use them to
1814 * update our aggregation state. All other frames are passed up
1815 * for processing by ieee80211_recv_action.
1816 */
1817 static int
1818 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
1819 const struct ieee80211_frame *wh,
1820 const uint8_t *frm, const uint8_t *efrm)
1821 {
1822 struct ieee80211com *ic = ni->ni_ic;
1823 struct ieee80211vap *vap = ni->ni_vap;
1824 struct ieee80211_rx_ampdu *rap;
1825 uint8_t dialogtoken;
1826 uint16_t baparamset, batimeout, baseqctl;
1827 uint16_t args[5];
1828 int tid;
1829
1830 dialogtoken = frm[2];
1831 baparamset = LE_READ_2(frm+3);
1832 batimeout = LE_READ_2(frm+5);
1833 baseqctl = LE_READ_2(frm+7);
1834
1835 tid = MS(baparamset, IEEE80211_BAPS_TID);
1836
1837 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1838 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
1839 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
1840 dialogtoken, baparamset,
1841 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1842 batimeout,
1843 MS(baseqctl, IEEE80211_BASEQ_START),
1844 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1845
1846 rap = &ni->ni_rx_ampdu[tid];
1847
1848 /* Send ADDBA response */
1849 args[0] = dialogtoken;
1850 /*
1851 * NB: We ack only if the sta associated with HT and
1852 * the ap is configured to do AMPDU rx (the latter
1853 * violates the 11n spec and is mostly for testing).
1854 */
1855 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1856 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1857 /* XXX handle ampdu_rx_start failure */
1858 ic->ic_ampdu_rx_start(ni, rap,
1859 baparamset, batimeout, baseqctl);
1860
1861 args[1] = IEEE80211_STATUS_SUCCESS;
1862 } else {
1863 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1864 ni, "reject ADDBA request: %s",
1865 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1866 "administratively disabled" :
1867 "not negotiated for station");
1868 vap->iv_stats.is_addba_reject++;
1869 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1870 }
1871 /* XXX honor rap flags? */
1872 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1873 | SM(tid, IEEE80211_BAPS_TID)
1874 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1875 ;
1876 args[3] = 0;
1877 args[4] = 0;
1878 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1879 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1880 return 0;
1881 }
1882
1883 static int
1884 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
1885 const struct ieee80211_frame *wh,
1886 const uint8_t *frm, const uint8_t *efrm)
1887 {
1888 struct ieee80211com *ic = ni->ni_ic;
1889 struct ieee80211vap *vap = ni->ni_vap;
1890 struct ieee80211_tx_ampdu *tap;
1891 uint8_t dialogtoken, policy;
1892 uint16_t baparamset, batimeout, code;
1893 int tid, ac, bufsiz;
1894
1895 dialogtoken = frm[2];
1896 code = LE_READ_2(frm+3);
1897 baparamset = LE_READ_2(frm+5);
1898 tid = MS(baparamset, IEEE80211_BAPS_TID);
1899 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1900 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
1901 batimeout = LE_READ_2(frm+7);
1902
1903 ac = TID_TO_WME_AC(tid);
1904 tap = &ni->ni_tx_ampdu[ac];
1905 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1906 IEEE80211_DISCARD_MAC(vap,
1907 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1908 ni->ni_macaddr, "ADDBA response",
1909 "no pending ADDBA, tid %d dialogtoken %u "
1910 "code %d", tid, dialogtoken, code);
1911 vap->iv_stats.is_addba_norequest++;
1912 return 0;
1913 }
1914 if (dialogtoken != tap->txa_token) {
1915 IEEE80211_DISCARD_MAC(vap,
1916 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1917 ni->ni_macaddr, "ADDBA response",
1918 "dialogtoken mismatch: waiting for %d, "
1919 "received %d, tid %d code %d",
1920 tap->txa_token, dialogtoken, tid, code);
1921 vap->iv_stats.is_addba_badtoken++;
1922 return 0;
1923 }
1924 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
1925 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
1926 IEEE80211_DISCARD_MAC(vap,
1927 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1928 ni->ni_macaddr, "ADDBA response",
1929 "policy mismatch: expecting %s, "
1930 "received %s, tid %d code %d",
1931 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
1932 policy, tid, code);
1933 vap->iv_stats.is_addba_badpolicy++;
1934 return 0;
1935 }
1936 #if 0
1937 /* XXX we take MIN in ieee80211_addba_response */
1938 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
1939 IEEE80211_DISCARD_MAC(vap,
1940 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1941 ni->ni_macaddr, "ADDBA response",
1942 "BA window too large: max %d, "
1943 "received %d, tid %d code %d",
1944 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
1945 vap->iv_stats.is_addba_badbawinsize++;
1946 return 0;
1947 }
1948 #endif
1949 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1950 "recv ADDBA response: dialogtoken %u code %d "
1951 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
1952 dialogtoken, code, baparamset, tid, bufsiz,
1953 batimeout);
1954 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
1955 return 0;
1956 }
1957
1958 static int
1959 ht_recv_action_ba_delba(struct ieee80211_node *ni,
1960 const struct ieee80211_frame *wh,
1961 const uint8_t *frm, const uint8_t *efrm)
1962 {
1963 struct ieee80211com *ic = ni->ni_ic;
1964 struct ieee80211_rx_ampdu *rap;
1965 struct ieee80211_tx_ampdu *tap;
1966 uint16_t baparamset, code;
1967 int tid, ac;
1968
1969 baparamset = LE_READ_2(frm+2);
1970 code = LE_READ_2(frm+4);
1971
1972 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
1973
1974 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1975 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
1976 "code %d", baparamset, tid,
1977 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
1978
1979 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
1980 ac = TID_TO_WME_AC(tid);
1981 tap = &ni->ni_tx_ampdu[ac];
1982 ic->ic_addba_stop(ni, tap);
1983 } else {
1984 rap = &ni->ni_rx_ampdu[tid];
1985 ic->ic_ampdu_rx_stop(ni, rap);
1986 }
1987 return 0;
1988 }
1989
1990 static int
1991 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
1992 const struct ieee80211_frame *wh,
1993 const uint8_t *frm, const uint8_t *efrm)
1994 {
1995 int chw;
1996
1997 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
1998
1999 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2000 "%s: HT txchwidth, width %d%s",
2001 __func__, chw, ni->ni_chw != chw ? "*" : "");
2002 if (chw != ni->ni_chw) {
2003 ni->ni_chw = chw;
2004 /* XXX notify on change */
2005 }
2006 return 0;
2007 }
2008
2009 static int
2010 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2011 const struct ieee80211_frame *wh,
2012 const uint8_t *frm, const uint8_t *efrm)
2013 {
2014 const struct ieee80211_action_ht_mimopowersave *mps =
2015 (const struct ieee80211_action_ht_mimopowersave *) frm;
2016
2017 /* XXX check iv_htcaps */
2018 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2019 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2020 else
2021 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2022 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2023 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2024 else
2025 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2026 /* XXX notify on change */
2027 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2028 "%s: HT MIMO PS (%s%s)", __func__,
2029 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2030 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2031 );
2032 return 0;
2033 }
2034
2035 /*
2036 * Transmit processing.
2037 */
2038
2039 /*
2040 * Check if A-MPDU should be requested/enabled for a stream.
2041 * We require a traffic rate above a per-AC threshold and we
2042 * also handle backoff from previous failed attempts.
2043 *
2044 * Drivers may override this method to bring in information
2045 * such as link state conditions in making the decision.
2046 */
2047 static int
2048 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2049 struct ieee80211_tx_ampdu *tap)
2050 {
2051 struct ieee80211vap *vap = ni->ni_vap;
2052
2053 if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
2054 return 0;
2055 /* XXX check rssi? */
2056 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2057 ticks < tap->txa_nextrequest) {
2058 /*
2059 * Don't retry too often; txa_nextrequest is set
2060 * to the minimum interval we'll retry after
2061 * ieee80211_addba_maxtries failed attempts are made.
2062 */
2063 return 0;
2064 }
2065 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2066 "enable AMPDU on %s, avgpps %d pkts %d",
2067 ieee80211_wme_acnames[tap->txa_ac], tap->txa_avgpps, tap->txa_pkts);
2068 return 1;
2069 }
2070
2071 /*
2072 * Request A-MPDU tx aggregation. Setup local state and
2073 * issue an ADDBA request. BA use will only happen after
2074 * the other end replies with ADDBA response.
2075 */
2076 int
2077 ieee80211_ampdu_request(struct ieee80211_node *ni,
2078 struct ieee80211_tx_ampdu *tap)
2079 {
2080 struct ieee80211com *ic = ni->ni_ic;
2081 uint16_t args[5];
2082 int tid, dialogtoken;
2083 static int tokens = 0; /* XXX */
2084
2085 /* XXX locking */
2086 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2087 /* do deferred setup of state */
2088 ampdu_tx_setup(tap);
2089 }
2090 /* XXX hack for not doing proper locking */
2091 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2092
2093 dialogtoken = (tokens+1) % 63; /* XXX */
2094 tid = WME_AC_TO_TID(tap->txa_ac);
2095 tap->txa_start = ni->ni_txseqs[tid];
2096
2097 args[0] = dialogtoken;
2098 args[1] = 0; /* NB: status code not used */
2099 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2100 | SM(tid, IEEE80211_BAPS_TID)
2101 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
2102 ;
2103 args[3] = 0; /* batimeout */
2104 /* NB: do first so there's no race against reply */
2105 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2106 /* unable to setup state, don't make request */
2107 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2108 ni, "%s: could not setup BA stream for AC %d",
2109 __func__, tap->txa_ac);
2110 /* defer next try so we don't slam the driver with requests */
2111 tap->txa_attempts = ieee80211_addba_maxtries;
2112 /* NB: check in case driver wants to override */
2113 if (tap->txa_nextrequest <= ticks)
2114 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2115 return 0;
2116 }
2117 tokens = dialogtoken; /* allocate token */
2118 /* NB: after calling ic_addba_request so driver can set txa_start */
2119 args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
2120 | SM(0, IEEE80211_BASEQ_FRAG)
2121 ;
2122 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2123 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2124 }
2125
2126 /*
2127 * Terminate an AMPDU tx stream. State is reclaimed
2128 * and the peer notified with a DelBA Action frame.
2129 */
2130 void
2131 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2132 int reason)
2133 {
2134 struct ieee80211com *ic = ni->ni_ic;
2135 struct ieee80211vap *vap = ni->ni_vap;
2136 uint16_t args[4];
2137
2138 /* XXX locking */
2139 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2140 if (IEEE80211_AMPDU_RUNNING(tap)) {
2141 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2142 ni, "%s: stop BA stream for AC %d (reason %d)",
2143 __func__, tap->txa_ac, reason);
2144 vap->iv_stats.is_ampdu_stop++;
2145
2146 ic->ic_addba_stop(ni, tap);
2147 args[0] = WME_AC_TO_TID(tap->txa_ac);
2148 args[1] = IEEE80211_DELBAPS_INIT;
2149 args[2] = reason; /* XXX reason code */
2150 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2151 IEEE80211_ACTION_BA_DELBA, args);
2152 } else {
2153 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2154 ni, "%s: BA stream for AC %d not running (reason %d)",
2155 __func__, tap->txa_ac, reason);
2156 vap->iv_stats.is_ampdu_stop_failed++;
2157 }
2158 }
2159
2160 static void
2161 bar_timeout(void *arg)
2162 {
2163 struct ieee80211_tx_ampdu *tap = arg;
2164 struct ieee80211_node *ni = tap->txa_ni;
2165
2166 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2167 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2168
2169 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2170 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2171 tap->txa_ac, tap->txa_flags, tap->txa_attempts);
2172
2173 /* guard against race with bar_tx_complete */
2174 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2175 return;
2176 /* XXX ? */
2177 if (tap->txa_attempts >= ieee80211_bar_maxtries)
2178 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2179 else
2180 ieee80211_send_bar(ni, tap, tap->txa_seqpending);
2181 }
2182
2183 static void
2184 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2185 {
2186 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2187 }
2188
2189 static void
2190 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2191 {
2192 callout_stop(&tap->txa_timer);
2193 }
2194
2195 static void
2196 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2197 {
2198 struct ieee80211_tx_ampdu *tap = arg;
2199
2200 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2201 ni, "%s: tid %u flags 0x%x pending %d status %d",
2202 __func__, tap->txa_ac, tap->txa_flags,
2203 callout_pending(&tap->txa_timer), status);
2204
2205 /* XXX locking */
2206 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2207 callout_pending(&tap->txa_timer)) {
2208 struct ieee80211com *ic = ni->ni_ic;
2209
2210 if (status == 0) /* ACK'd */
2211 bar_stop_timer(tap);
2212 ic->ic_bar_response(ni, tap, status);
2213 /* NB: just let timer expire so we pace requests */
2214 }
2215 }
2216
2217 static void
2218 ieee80211_bar_response(struct ieee80211_node *ni,
2219 struct ieee80211_tx_ampdu *tap, int status)
2220 {
2221
2222 if (status == 0) { /* got ACK */
2223 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2224 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2225 tap->txa_start,
2226 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2227 tap->txa_qframes, tap->txa_seqpending,
2228 WME_AC_TO_TID(tap->txa_ac));
2229
2230 /* NB: timer already stopped in bar_tx_complete */
2231 tap->txa_start = tap->txa_seqpending;
2232 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2233 }
2234 }
2235
2236 /*
2237 * Transmit a BAR frame to the specified node. The
2238 * BAR contents are drawn from the supplied aggregation
2239 * state associated with the node.
2240 *
2241 * NB: we only handle immediate ACK w/ compressed bitmap.
2242 */
2243 int
2244 ieee80211_send_bar(struct ieee80211_node *ni,
2245 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2246 {
2247 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2248 struct ieee80211vap *vap = ni->ni_vap;
2249 struct ieee80211com *ic = ni->ni_ic;
2250 struct ieee80211_frame_bar *bar;
2251 struct mbuf *m;
2252 uint16_t barctl, barseqctl;
2253 uint8_t *frm;
2254 int tid, ret;
2255
2256 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2257 /* no ADDBA response, should not happen */
2258 /* XXX stat+msg */
2259 return EINVAL;
2260 }
2261 /* XXX locking */
2262 bar_stop_timer(tap);
2263
2264 ieee80211_ref_node(ni);
2265
2266 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2267 if (m == NULL)
2268 senderr(ENOMEM, is_tx_nobuf);
2269
2270 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2271 m_freem(m);
2272 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2273 /* NOTREACHED */
2274 }
2275
2276 bar = mtod(m, struct ieee80211_frame_bar *);
2277 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2278 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2279 bar->i_fc[1] = 0;
2280 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2281 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2282
2283 tid = WME_AC_TO_TID(tap->txa_ac);
2284 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2285 0 : IEEE80211_BAR_NOACK)
2286 | IEEE80211_BAR_COMP
2287 | SM(tid, IEEE80211_BAR_TID)
2288 ;
2289 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2290 /* NB: known to have proper alignment */
2291 bar->i_ctl = htole16(barctl);
2292 bar->i_seq = htole16(barseqctl);
2293 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2294
2295 M_WME_SETAC(m, WME_AC_VO);
2296
2297 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2298
2299 /* XXX locking */
2300 /* init/bump attempts counter */
2301 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2302 tap->txa_attempts = 1;
2303 else
2304 tap->txa_attempts++;
2305 tap->txa_seqpending = seq;
2306 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2307
2308 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2309 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2310 tid, barctl, seq, tap->txa_attempts);
2311
2312 /*
2313 * ic_raw_xmit will free the node reference
2314 * regardless of queue/TX success or failure.
2315 */
2316 ret = ic->ic_raw_xmit(ni, m, NULL);
2317 if (ret != 0) {
2318 /* xmit failed, clear state flag */
2319 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2320 return ret;
2321 }
2322 /* XXX hack against tx complete happening before timer is started */
2323 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2324 bar_start_timer(tap);
2325 return 0;
2326 bad:
2327 ieee80211_free_node(ni);
2328 return ret;
2329 #undef senderr
2330 }
2331
2332 static int
2333 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
2334 {
2335 struct ieee80211_bpf_params params;
2336
2337 memset(¶ms, 0, sizeof(params));
2338 params.ibp_pri = WME_AC_VO;
2339 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2340 /* NB: we know all frames are unicast */
2341 params.ibp_try0 = ni->ni_txparms->maxretry;
2342 params.ibp_power = ni->ni_txpower;
2343 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2344 ¶ms);
2345 }
2346
2347 #define ADDSHORT(frm, v) do { \
2348 frm[0] = (v) & 0xff; \
2349 frm[1] = (v) >> 8; \
2350 frm += 2; \
2351 } while (0)
2352
2353 /*
2354 * Send an action management frame. The arguments are stuff
2355 * into a frame without inspection; the caller is assumed to
2356 * prepare them carefully (e.g. based on the aggregation state).
2357 */
2358 static int
2359 ht_send_action_ba_addba(struct ieee80211_node *ni,
2360 int category, int action, void *arg0)
2361 {
2362 struct ieee80211vap *vap = ni->ni_vap;
2363 struct ieee80211com *ic = ni->ni_ic;
2364 uint16_t *args = arg0;
2365 struct mbuf *m;
2366 uint8_t *frm;
2367
2368 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2369 "send ADDBA %s: dialogtoken %d status %d "
2370 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2371 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
2372 "request" : "response",
2373 args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
2374 args[3], args[4]);
2375
2376 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2377 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2378 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2379 ieee80211_ref_node(ni);
2380
2381 m = ieee80211_getmgtframe(&frm,
2382 ic->ic_headroom + sizeof(struct ieee80211_frame),
2383 sizeof(uint16_t) /* action+category */
2384 /* XXX may action payload */
2385 + sizeof(struct ieee80211_action_ba_addbaresponse)
2386 );
2387 if (m != NULL) {
2388 *frm++ = category;
2389 *frm++ = action;
2390 *frm++ = args[0]; /* dialog token */
2391 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
2392 ADDSHORT(frm, args[1]); /* status code */
2393 ADDSHORT(frm, args[2]); /* baparamset */
2394 ADDSHORT(frm, args[3]); /* batimeout */
2395 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
2396 ADDSHORT(frm, args[4]); /* baseqctl */
2397 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2398 return ht_action_output(ni, m);
2399 } else {
2400 vap->iv_stats.is_tx_nobuf++;
2401 ieee80211_free_node(ni);
2402 return ENOMEM;
2403 }
2404 }
2405
2406 static int
2407 ht_send_action_ba_delba(struct ieee80211_node *ni,
2408 int category, int action, void *arg0)
2409 {
2410 struct ieee80211vap *vap = ni->ni_vap;
2411 struct ieee80211com *ic = ni->ni_ic;
2412 uint16_t *args = arg0;
2413 struct mbuf *m;
2414 uint16_t baparamset;
2415 uint8_t *frm;
2416
2417 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2418 | args[1]
2419 ;
2420 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2421 "send DELBA action: tid %d, initiator %d reason %d",
2422 args[0], args[1], args[2]);
2423
2424 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2425 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2426 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2427 ieee80211_ref_node(ni);
2428
2429 m = ieee80211_getmgtframe(&frm,
2430 ic->ic_headroom + sizeof(struct ieee80211_frame),
2431 sizeof(uint16_t) /* action+category */
2432 /* XXX may action payload */
2433 + sizeof(struct ieee80211_action_ba_addbaresponse)
2434 );
2435 if (m != NULL) {
2436 *frm++ = category;
2437 *frm++ = action;
2438 ADDSHORT(frm, baparamset);
2439 ADDSHORT(frm, args[2]); /* reason code */
2440 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2441 return ht_action_output(ni, m);
2442 } else {
2443 vap->iv_stats.is_tx_nobuf++;
2444 ieee80211_free_node(ni);
2445 return ENOMEM;
2446 }
2447 }
2448
2449 static int
2450 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
2451 int category, int action, void *arg0)
2452 {
2453 struct ieee80211vap *vap = ni->ni_vap;
2454 struct ieee80211com *ic = ni->ni_ic;
2455 struct mbuf *m;
2456 uint8_t *frm;
2457
2458 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2459 "send HT txchwidth: width %d",
2460 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
2461
2462 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2463 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2464 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2465 ieee80211_ref_node(ni);
2466
2467 m = ieee80211_getmgtframe(&frm,
2468 ic->ic_headroom + sizeof(struct ieee80211_frame),
2469 sizeof(uint16_t) /* action+category */
2470 /* XXX may action payload */
2471 + sizeof(struct ieee80211_action_ba_addbaresponse)
2472 );
2473 if (m != NULL) {
2474 *frm++ = category;
2475 *frm++ = action;
2476 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2477 IEEE80211_A_HT_TXCHWIDTH_2040 :
2478 IEEE80211_A_HT_TXCHWIDTH_20;
2479 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2480 return ht_action_output(ni, m);
2481 } else {
2482 vap->iv_stats.is_tx_nobuf++;
2483 ieee80211_free_node(ni);
2484 return ENOMEM;
2485 }
2486 }
2487 #undef ADDSHORT
2488
2489 /*
2490 * Construct the MCS bit mask for inclusion in an HT capabilities
2491 * information element.
2492 */
2493 static void
2494 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
2495 {
2496 int i;
2497 uint8_t txparams;
2498
2499 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
2500 ("ic_rxstream %d out of range", ic->ic_rxstream));
2501 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
2502 ("ic_txstream %d out of range", ic->ic_txstream));
2503
2504 for (i = 0; i < ic->ic_rxstream * 8; i++)
2505 setbit(frm, i);
2506 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
2507 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
2508 setbit(frm, 32);
2509 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
2510 if (ic->ic_rxstream >= 2) {
2511 for (i = 33; i <= 38; i++)
2512 setbit(frm, i);
2513 }
2514 if (ic->ic_rxstream >= 3) {
2515 for (i = 39; i <= 52; i++)
2516 setbit(frm, i);
2517 }
2518 if (ic->ic_txstream >= 4) {
2519 for (i = 53; i <= 76; i++)
2520 setbit(frm, i);
2521 }
2522 }
2523
2524 if (ic->ic_rxstream != ic->ic_txstream) {
2525 txparams = 0x1; /* TX MCS set defined */
2526 txparams |= 0x2; /* TX RX MCS not equal */
2527 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
2528 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
2529 txparams |= 0x16; /* TX unequal modulation sup */
2530 } else
2531 txparams = 0;
2532 frm[12] = txparams;
2533 }
2534
2535 /*
2536 * Add body of an HTCAP information element.
2537 */
2538 static uint8_t *
2539 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2540 {
2541 #define ADDSHORT(frm, v) do { \
2542 frm[0] = (v) & 0xff; \
2543 frm[1] = (v) >> 8; \
2544 frm += 2; \
2545 } while (0)
2546 struct ieee80211com *ic = ni->ni_ic;
2547 struct ieee80211vap *vap = ni->ni_vap;
2548 uint16_t caps, extcaps;
2549 int rxmax, density;
2550
2551 /* HT capabilities */
2552 caps = vap->iv_htcaps & 0xffff;
2553 /*
2554 * Note channel width depends on whether we are operating as
2555 * a sta or not. When operating as a sta we are generating
2556 * a request based on our desired configuration. Otherwise
2557 * we are operational and the channel attributes identify
2558 * how we've been setup (which might be different if a fixed
2559 * channel is specified).
2560 */
2561 if (vap->iv_opmode == IEEE80211_M_STA) {
2562 /* override 20/40 use based on config */
2563 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2564 caps |= IEEE80211_HTCAP_CHWIDTH40;
2565 else
2566 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2567 /* use advertised setting (XXX locally constraint) */
2568 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2569 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2570
2571 /*
2572 * NB: Hardware might support HT40 on some but not all
2573 * channels. We can't determine this earlier because only
2574 * after association the channel is upgraded to HT based
2575 * on the negotiated capabilities.
2576 */
2577 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
2578 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
2579 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
2580 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2581 } else {
2582 /* override 20/40 use based on current channel */
2583 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2584 caps |= IEEE80211_HTCAP_CHWIDTH40;
2585 else
2586 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2587 rxmax = vap->iv_ampdu_rxmax;
2588 density = vap->iv_ampdu_density;
2589 }
2590 /* adjust short GI based on channel and config */
2591 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2592 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2593 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2594 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2595 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2596 ADDSHORT(frm, caps);
2597
2598 /* HT parameters */
2599 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2600 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2601 ;
2602 frm++;
2603
2604 /* pre-zero remainder of ie */
2605 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2606 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2607
2608 /* supported MCS set */
2609 /*
2610 * XXX: For sta mode the rate set should be restricted based
2611 * on the AP's capabilities, but ni_htrates isn't setup when
2612 * we're called to form an AssocReq frame so for now we're
2613 * restricted to the device capabilities.
2614 */
2615 ieee80211_set_mcsset(ni->ni_ic, frm);
2616
2617 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
2618 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2619
2620 /* HT extended capabilities */
2621 extcaps = vap->iv_htextcaps & 0xffff;
2622
2623 ADDSHORT(frm, extcaps);
2624
2625 frm += sizeof(struct ieee80211_ie_htcap) -
2626 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
2627
2628 return frm;
2629 #undef ADDSHORT
2630 }
2631
2632 /*
2633 * Add 802.11n HT capabilities information element
2634 */
2635 uint8_t *
2636 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2637 {
2638 frm[0] = IEEE80211_ELEMID_HTCAP;
2639 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2640 return ieee80211_add_htcap_body(frm + 2, ni);
2641 }
2642
2643 /*
2644 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2645 * used for compatibility w/ pre-draft implementations.
2646 */
2647 uint8_t *
2648 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2649 {
2650 frm[0] = IEEE80211_ELEMID_VENDOR;
2651 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2652 frm[2] = (BCM_OUI >> 0) & 0xff;
2653 frm[3] = (BCM_OUI >> 8) & 0xff;
2654 frm[4] = (BCM_OUI >> 16) & 0xff;
2655 frm[5] = BCM_OUI_HTCAP;
2656 return ieee80211_add_htcap_body(frm + 6, ni);
2657 }
2658
2659 /*
2660 * Construct the MCS bit mask of basic rates
2661 * for inclusion in an HT information element.
2662 */
2663 static void
2664 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2665 {
2666 int i;
2667
2668 for (i = 0; i < rs->rs_nrates; i++) {
2669 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2670 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2671 r < IEEE80211_HTRATE_MAXSIZE) {
2672 /* NB: this assumes a particular implementation */
2673 setbit(frm, r);
2674 }
2675 }
2676 }
2677
2678 /*
2679 * Update the HTINFO ie for a beacon frame.
2680 */
2681 void
2682 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2683 struct ieee80211_beacon_offsets *bo)
2684 {
2685 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2686 const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
2687 struct ieee80211com *ic = vap->iv_ic;
2688 struct ieee80211_ie_htinfo *ht =
2689 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2690
2691 /* XXX only update on channel change */
2692 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2693 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2694 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2695 else
2696 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2697 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2698 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2699 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2700 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2701 else
2702 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2703 if (IEEE80211_IS_CHAN_HT40(bsschan))
2704 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2705
2706 /* protection mode */
2707 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2708
2709 /* XXX propagate to vendor ie's */
2710 #undef PROTMODE
2711 }
2712
2713 /*
2714 * Add body of an HTINFO information element.
2715 *
2716 * NB: We don't use struct ieee80211_ie_htinfo because we can
2717 * be called to fillin both a standard ie and a compat ie that
2718 * has a vendor OUI at the front.
2719 */
2720 static uint8_t *
2721 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2722 {
2723 struct ieee80211vap *vap = ni->ni_vap;
2724 struct ieee80211com *ic = ni->ni_ic;
2725
2726 /* pre-zero remainder of ie */
2727 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2728
2729 /* primary/control channel center */
2730 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2731
2732 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2733 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2734 else
2735 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2736 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2737 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2738 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2739 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2740 else
2741 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2742 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2743 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2744
2745 frm[1] = ic->ic_curhtprotmode;
2746
2747 frm += 5;
2748
2749 /* basic MCS set */
2750 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2751 frm += sizeof(struct ieee80211_ie_htinfo) -
2752 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2753 return frm;
2754 }
2755
2756 /*
2757 * Add 802.11n HT information information element.
2758 */
2759 uint8_t *
2760 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2761 {
2762 frm[0] = IEEE80211_ELEMID_HTINFO;
2763 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2764 return ieee80211_add_htinfo_body(frm + 2, ni);
2765 }
2766
2767 /*
2768 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2769 * used for compatibility w/ pre-draft implementations.
2770 */
2771 uint8_t *
2772 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2773 {
2774 frm[0] = IEEE80211_ELEMID_VENDOR;
2775 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2776 frm[2] = (BCM_OUI >> 0) & 0xff;
2777 frm[3] = (BCM_OUI >> 8) & 0xff;
2778 frm[4] = (BCM_OUI >> 16) & 0xff;
2779 frm[5] = BCM_OUI_HTINFO;
2780 return ieee80211_add_htinfo_body(frm + 6, ni);
2781 }
Cache object: 29917874ce19925021786fe5c1173f8f
|