1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * IEEE 802.11n protocol support.
30 */
31
32 #include "opt_inet.h"
33 #include "opt_wlan.h"
34
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/systm.h>
39 #include <sys/endian.h>
40
41 #include <sys/socket.h>
42
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/if_media.h>
46 #include <net/ethernet.h>
47
48 #include <net80211/ieee80211_var.h>
49 #include <net80211/ieee80211_action.h>
50 #include <net80211/ieee80211_input.h>
51
52 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
53 { 13, 14, 27, 30 }, /* MCS 0 */
54 { 26, 29, 54, 60 }, /* MCS 1 */
55 { 39, 43, 81, 90 }, /* MCS 2 */
56 { 52, 58, 108, 120 }, /* MCS 3 */
57 { 78, 87, 162, 180 }, /* MCS 4 */
58 { 104, 116, 216, 240 }, /* MCS 5 */
59 { 117, 130, 243, 270 }, /* MCS 6 */
60 { 130, 144, 270, 300 }, /* MCS 7 */
61 { 26, 29, 54, 60 }, /* MCS 8 */
62 { 52, 58, 108, 120 }, /* MCS 9 */
63 { 78, 87, 162, 180 }, /* MCS 10 */
64 { 104, 116, 216, 240 }, /* MCS 11 */
65 { 156, 173, 324, 360 }, /* MCS 12 */
66 { 208, 231, 432, 480 }, /* MCS 13 */
67 { 234, 260, 486, 540 }, /* MCS 14 */
68 { 260, 289, 540, 600 }, /* MCS 15 */
69 { 39, 43, 81, 90 }, /* MCS 16 */
70 { 78, 87, 162, 180 }, /* MCS 17 */
71 { 117, 130, 243, 270 }, /* MCS 18 */
72 { 156, 173, 324, 360 }, /* MCS 19 */
73 { 234, 260, 486, 540 }, /* MCS 20 */
74 { 312, 347, 648, 720 }, /* MCS 21 */
75 { 351, 390, 729, 810 }, /* MCS 22 */
76 { 390, 433, 810, 900 }, /* MCS 23 */
77 { 52, 58, 108, 120 }, /* MCS 24 */
78 { 104, 116, 216, 240 }, /* MCS 25 */
79 { 156, 173, 324, 360 }, /* MCS 26 */
80 { 208, 231, 432, 480 }, /* MCS 27 */
81 { 312, 347, 648, 720 }, /* MCS 28 */
82 { 416, 462, 864, 960 }, /* MCS 29 */
83 { 468, 520, 972, 1080 }, /* MCS 30 */
84 { 520, 578, 1080, 1200 }, /* MCS 31 */
85 { 0, 0, 12, 13 }, /* MCS 32 */
86 { 78, 87, 162, 180 }, /* MCS 33 */
87 { 104, 116, 216, 240 }, /* MCS 34 */
88 { 130, 144, 270, 300 }, /* MCS 35 */
89 { 117, 130, 243, 270 }, /* MCS 36 */
90 { 156, 173, 324, 360 }, /* MCS 37 */
91 { 195, 217, 405, 450 }, /* MCS 38 */
92 { 104, 116, 216, 240 }, /* MCS 39 */
93 { 130, 144, 270, 300 }, /* MCS 40 */
94 { 130, 144, 270, 300 }, /* MCS 41 */
95 { 156, 173, 324, 360 }, /* MCS 42 */
96 { 182, 202, 378, 420 }, /* MCS 43 */
97 { 182, 202, 378, 420 }, /* MCS 44 */
98 { 208, 231, 432, 480 }, /* MCS 45 */
99 { 156, 173, 324, 360 }, /* MCS 46 */
100 { 195, 217, 405, 450 }, /* MCS 47 */
101 { 195, 217, 405, 450 }, /* MCS 48 */
102 { 234, 260, 486, 540 }, /* MCS 49 */
103 { 273, 303, 567, 630 }, /* MCS 50 */
104 { 273, 303, 567, 630 }, /* MCS 51 */
105 { 312, 347, 648, 720 }, /* MCS 52 */
106 { 130, 144, 270, 300 }, /* MCS 53 */
107 { 156, 173, 324, 360 }, /* MCS 54 */
108 { 182, 202, 378, 420 }, /* MCS 55 */
109 { 156, 173, 324, 360 }, /* MCS 56 */
110 { 182, 202, 378, 420 }, /* MCS 57 */
111 { 208, 231, 432, 480 }, /* MCS 58 */
112 { 234, 260, 486, 540 }, /* MCS 59 */
113 { 208, 231, 432, 480 }, /* MCS 60 */
114 { 234, 260, 486, 540 }, /* MCS 61 */
115 { 260, 289, 540, 600 }, /* MCS 62 */
116 { 260, 289, 540, 600 }, /* MCS 63 */
117 { 286, 318, 594, 660 }, /* MCS 64 */
118 { 195, 217, 405, 450 }, /* MCS 65 */
119 { 234, 260, 486, 540 }, /* MCS 66 */
120 { 273, 303, 567, 630 }, /* MCS 67 */
121 { 234, 260, 486, 540 }, /* MCS 68 */
122 { 273, 303, 567, 630 }, /* MCS 69 */
123 { 312, 347, 648, 720 }, /* MCS 70 */
124 { 351, 390, 729, 810 }, /* MCS 71 */
125 { 312, 347, 648, 720 }, /* MCS 72 */
126 { 351, 390, 729, 810 }, /* MCS 73 */
127 { 390, 433, 810, 900 }, /* MCS 74 */
128 { 390, 433, 810, 900 }, /* MCS 75 */
129 { 429, 477, 891, 990 }, /* MCS 76 */
130 };
131
132 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
133 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age,
134 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
135 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
136 "AMPDU max reorder age (ms)");
137
138 static int ieee80211_recv_bar_ena = 1;
139 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
140 0, "BAR frame processing (ena/dis)");
141
142 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
143 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout,
144 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
145 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
146 "ADDBA request timeout (ms)");
147 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
148 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff,
149 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
150 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
151 "ADDBA request backoff (ms)");
152 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
153 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
154 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
155
156 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
157 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
158
159 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
160 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
161 static ieee80211_recv_action_func ht_recv_action_ba_delba;
162 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
163 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
164
165 static ieee80211_send_action_func ht_send_action_ba_addba;
166 static ieee80211_send_action_func ht_send_action_ba_delba;
167 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
168
169 static void
ieee80211_ht_init(void)170 ieee80211_ht_init(void)
171 {
172 /*
173 * Setup HT parameters that depends on the clock frequency.
174 */
175 ieee80211_ampdu_age = msecs_to_ticks(500);
176 ieee80211_addba_timeout = msecs_to_ticks(250);
177 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
178 ieee80211_bar_timeout = msecs_to_ticks(250);
179 /*
180 * Register action frame handlers.
181 */
182 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
183 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
184 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
185 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
186 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
187 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
188 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
189 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
190 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
191 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
192
193 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
194 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
195 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
196 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
197 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
198 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
199 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
200 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
201 }
202 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
203
204 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
205 struct ieee80211_tx_ampdu *tap);
206 static int ieee80211_addba_request(struct ieee80211_node *ni,
207 struct ieee80211_tx_ampdu *tap,
208 int dialogtoken, int baparamset, int batimeout);
209 static int ieee80211_addba_response(struct ieee80211_node *ni,
210 struct ieee80211_tx_ampdu *tap,
211 int code, int baparamset, int batimeout);
212 static void ieee80211_addba_stop(struct ieee80211_node *ni,
213 struct ieee80211_tx_ampdu *tap);
214 static void null_addba_response_timeout(struct ieee80211_node *ni,
215 struct ieee80211_tx_ampdu *tap);
216
217 static void ieee80211_bar_response(struct ieee80211_node *ni,
218 struct ieee80211_tx_ampdu *tap, int status);
219 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
220 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
221 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
222 int baparamset, int batimeout, int baseqctl);
223 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
224
225 void
ieee80211_ht_attach(struct ieee80211com * ic)226 ieee80211_ht_attach(struct ieee80211com *ic)
227 {
228 /* setup default aggregation policy */
229 ic->ic_recv_action = ieee80211_recv_action;
230 ic->ic_send_action = ieee80211_send_action;
231 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
232 ic->ic_addba_request = ieee80211_addba_request;
233 ic->ic_addba_response = ieee80211_addba_response;
234 ic->ic_addba_response_timeout = null_addba_response_timeout;
235 ic->ic_addba_stop = ieee80211_addba_stop;
236 ic->ic_bar_response = ieee80211_bar_response;
237 ic->ic_ampdu_rx_start = ampdu_rx_start;
238 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
239
240 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
241 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
242 }
243
244 void
ieee80211_ht_detach(struct ieee80211com * ic)245 ieee80211_ht_detach(struct ieee80211com *ic)
246 {
247 }
248
249 void
ieee80211_ht_vattach(struct ieee80211vap * vap)250 ieee80211_ht_vattach(struct ieee80211vap *vap)
251 {
252
253 /* driver can override defaults */
254 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
255 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
256 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
257 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
258 /* tx aggregation traffic thresholds */
259 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
260 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
261 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
262 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
263
264 vap->iv_htprotmode = IEEE80211_PROT_RTSCTS;
265 vap->iv_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
266
267 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
268 /*
269 * Device is HT capable; enable all HT-related
270 * facilities by default.
271 * XXX these choices may be too aggressive.
272 */
273 vap->iv_flags_ht |= IEEE80211_FHT_HT
274 | IEEE80211_FHT_HTCOMPAT
275 ;
276 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
277 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
278 /* XXX infer from channel list? */
279 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
280 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
281 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
282 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
283 }
284 /* enable RIFS if capable */
285 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
286 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
287
288 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
289 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
290 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
291 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
292 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
293 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
294 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
295
296 if (vap->iv_htcaps & IEEE80211_HTCAP_TXSTBC)
297 vap->iv_flags_ht |= IEEE80211_FHT_STBC_TX;
298 if (vap->iv_htcaps & IEEE80211_HTCAP_RXSTBC)
299 vap->iv_flags_ht |= IEEE80211_FHT_STBC_RX;
300
301 if (vap->iv_htcaps & IEEE80211_HTCAP_LDPC)
302 vap->iv_flags_ht |= IEEE80211_FHT_LDPC_RX;
303 if (vap->iv_htcaps & IEEE80211_HTC_TXLDPC)
304 vap->iv_flags_ht |= IEEE80211_FHT_LDPC_TX;
305 }
306 /* NB: disable default legacy WDS, too many issues right now */
307 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
308 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
309 }
310
311 void
ieee80211_ht_vdetach(struct ieee80211vap * vap)312 ieee80211_ht_vdetach(struct ieee80211vap *vap)
313 {
314 }
315
316 static int
ht_getrate(struct ieee80211com * ic,int index,enum ieee80211_phymode mode,int ratetype)317 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
318 int ratetype)
319 {
320 int mword, rate;
321
322 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
323 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
324 return (0);
325 switch (ratetype) {
326 case 0:
327 rate = ieee80211_htrates[index].ht20_rate_800ns;
328 break;
329 case 1:
330 rate = ieee80211_htrates[index].ht20_rate_400ns;
331 break;
332 case 2:
333 rate = ieee80211_htrates[index].ht40_rate_800ns;
334 break;
335 default:
336 rate = ieee80211_htrates[index].ht40_rate_400ns;
337 break;
338 }
339 return (rate);
340 }
341
342 static struct printranges {
343 int minmcs;
344 int maxmcs;
345 int txstream;
346 int ratetype;
347 int htcapflags;
348 } ranges[] = {
349 { 0, 7, 1, 0, 0 },
350 { 8, 15, 2, 0, 0 },
351 { 16, 23, 3, 0, 0 },
352 { 24, 31, 4, 0, 0 },
353 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
354 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
355 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
356 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
357 { 0, 0, 0, 0, 0 },
358 };
359
360 static void
ht_rateprint(struct ieee80211com * ic,enum ieee80211_phymode mode,int ratetype)361 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
362 {
363 int minrate, maxrate;
364 struct printranges *range;
365
366 for (range = ranges; range->txstream != 0; range++) {
367 if (ic->ic_txstream < range->txstream)
368 continue;
369 if (range->htcapflags &&
370 (ic->ic_htcaps & range->htcapflags) == 0)
371 continue;
372 if (ratetype < range->ratetype)
373 continue;
374 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
375 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
376 if (range->maxmcs) {
377 ic_printf(ic, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
378 range->minmcs, range->maxmcs,
379 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
380 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
381 } else {
382 ic_printf(ic, "MCS %d: %d%sMbps\n", range->minmcs,
383 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
384 }
385 }
386 }
387
388 static void
ht_announce(struct ieee80211com * ic,enum ieee80211_phymode mode)389 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
390 {
391 const char *modestr = ieee80211_phymode_name[mode];
392
393 ic_printf(ic, "%s MCS 20MHz\n", modestr);
394 ht_rateprint(ic, mode, 0);
395 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
396 ic_printf(ic, "%s MCS 20MHz SGI\n", modestr);
397 ht_rateprint(ic, mode, 1);
398 }
399 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
400 ic_printf(ic, "%s MCS 40MHz:\n", modestr);
401 ht_rateprint(ic, mode, 2);
402 }
403 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
404 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
405 ic_printf(ic, "%s MCS 40MHz SGI:\n", modestr);
406 ht_rateprint(ic, mode, 3);
407 }
408 }
409
410 void
ieee80211_ht_announce(struct ieee80211com * ic)411 ieee80211_ht_announce(struct ieee80211com *ic)
412 {
413
414 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
415 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
416 ic_printf(ic, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
417 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
418 ht_announce(ic, IEEE80211_MODE_11NA);
419 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
420 ht_announce(ic, IEEE80211_MODE_11NG);
421 }
422
423 void
ieee80211_init_suphtrates(struct ieee80211com * ic)424 ieee80211_init_suphtrates(struct ieee80211com *ic)
425 {
426 #define ADDRATE(x) do { \
427 htrateset->rs_rates[htrateset->rs_nrates] = x; \
428 htrateset->rs_nrates++; \
429 } while (0)
430 struct ieee80211_htrateset *htrateset = &ic->ic_sup_htrates;
431 int i;
432
433 memset(htrateset, 0, sizeof(struct ieee80211_htrateset));
434 for (i = 0; i < ic->ic_txstream * 8; i++)
435 ADDRATE(i);
436 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
437 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
438 ADDRATE(32);
439 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
440 if (ic->ic_txstream >= 2) {
441 for (i = 33; i <= 38; i++)
442 ADDRATE(i);
443 }
444 if (ic->ic_txstream >= 3) {
445 for (i = 39; i <= 52; i++)
446 ADDRATE(i);
447 }
448 if (ic->ic_txstream == 4) {
449 for (i = 53; i <= 76; i++)
450 ADDRATE(i);
451 }
452 }
453 #undef ADDRATE
454 }
455
456 /*
457 * Receive processing.
458 */
459
460 /*
461 * Decap the encapsulated A-MSDU frames and dispatch all but
462 * the last for delivery. The last frame is returned for
463 * delivery via the normal path.
464 */
465 struct mbuf *
ieee80211_decap_amsdu(struct ieee80211_node * ni,struct mbuf * m)466 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
467 {
468 struct ieee80211vap *vap = ni->ni_vap;
469 int framelen;
470 struct mbuf *n;
471
472 /* discard 802.3 header inserted by ieee80211_decap */
473 m_adj(m, sizeof(struct ether_header));
474
475 vap->iv_stats.is_amsdu_decap++;
476
477 for (;;) {
478 /*
479 * Decap the first frame, bust it apart from the
480 * remainder and deliver. We leave the last frame
481 * delivery to the caller (for consistency with other
482 * code paths, could also do it here).
483 */
484 m = ieee80211_decap1(m, &framelen);
485 if (m == NULL) {
486 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
487 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
488 vap->iv_stats.is_amsdu_tooshort++;
489 return NULL;
490 }
491 if (m->m_pkthdr.len == framelen)
492 break;
493 n = m_split(m, framelen, IEEE80211_M_NOWAIT);
494 if (n == NULL) {
495 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
496 ni->ni_macaddr, "a-msdu",
497 "%s", "unable to split encapsulated frames");
498 vap->iv_stats.is_amsdu_split++;
499 m_freem(m); /* NB: must reclaim */
500 return NULL;
501 }
502 vap->iv_deliver_data(vap, ni, m);
503
504 /*
505 * Remove frame contents; each intermediate frame
506 * is required to be aligned to a 4-byte boundary.
507 */
508 m = n;
509 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
510 }
511 return m; /* last delivered by caller */
512 }
513
514 static void
ampdu_rx_purge_slot(struct ieee80211_rx_ampdu * rap,int i)515 ampdu_rx_purge_slot(struct ieee80211_rx_ampdu *rap, int i)
516 {
517 struct mbuf *m;
518
519 /* Walk the queue, removing frames as appropriate */
520 for (;;) {
521 m = mbufq_dequeue(&rap->rxa_mq[i]);
522 if (m == NULL)
523 break;
524 rap->rxa_qbytes -= m->m_pkthdr.len;
525 rap->rxa_qframes--;
526 m_freem(m);
527 }
528 }
529
530 /*
531 * Add the given frame to the current RX reorder slot.
532 *
533 * For future offloaded A-MSDU handling where multiple frames with
534 * the same sequence number show up here, this routine will append
535 * those frames as long as they're appropriately tagged.
536 */
537 static int
ampdu_rx_add_slot(struct ieee80211_rx_ampdu * rap,int off,int tid,ieee80211_seq rxseq,struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs)538 ampdu_rx_add_slot(struct ieee80211_rx_ampdu *rap, int off, int tid,
539 ieee80211_seq rxseq,
540 struct ieee80211_node *ni,
541 struct mbuf *m,
542 const struct ieee80211_rx_stats *rxs)
543 {
544 const struct ieee80211_rx_stats *rxs_final = NULL;
545 struct ieee80211vap *vap = ni->ni_vap;
546 int toss_dup;
547 #define PROCESS 0 /* caller should process frame */
548 #define CONSUMED 1 /* frame consumed, caller does nothing */
549
550 /*
551 * Figure out if this is a duplicate frame for the given slot.
552 *
553 * We're assuming that the driver will hand us all the frames
554 * for a given AMSDU decap pass and if we get /a/ frame
555 * for an AMSDU decap then we'll get all of them.
556 *
557 * The tricksy bit is that we don't know when the /end/ of
558 * the decap pass is, because we aren't tracking state here
559 * per-slot to know that we've finished receiving the frame list.
560 *
561 * The driver sets RX_F_AMSDU and RX_F_AMSDU_MORE to tell us
562 * what's going on; so ideally we'd just check the frame at the
563 * end of the reassembly slot to see if its F_AMSDU w/ no F_AMSDU_MORE -
564 * that means we've received the whole AMSDU decap pass.
565 */
566
567 /*
568 * Get the rxs of the final mbuf in the slot, if one exists.
569 */
570 if (!mbufq_empty(&rap->rxa_mq[off])) {
571 rxs_final = ieee80211_get_rx_params_ptr(mbufq_last(&rap->rxa_mq[off]));
572 }
573
574 /* Default to tossing the duplicate frame */
575 toss_dup = 1;
576
577 /*
578 * Check to see if the final frame has F_AMSDU and F_AMSDU set, AND
579 * this frame has F_AMSDU set (MORE or otherwise.) That's a sign
580 * that more can come.
581 */
582
583 if ((rxs != NULL) && (rxs_final != NULL) &&
584 ieee80211_check_rxseq_amsdu(rxs) &&
585 ieee80211_check_rxseq_amsdu(rxs_final)) {
586 if (! ieee80211_check_rxseq_amsdu_more(rxs_final)) {
587 /*
588 * amsdu_more() returning 0 means "it's not the
589 * final frame" so we can append more
590 * frames here.
591 */
592 toss_dup = 0;
593 }
594 }
595
596 /*
597 * If the list is empty OR we have determined we can put more
598 * driver decap'ed AMSDU frames in here, then insert.
599 */
600 if (mbufq_empty(&rap->rxa_mq[off]) || (toss_dup == 0)) {
601 if (mbufq_enqueue(&rap->rxa_mq[off], m) != 0) {
602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
603 ni->ni_macaddr,
604 "a-mpdu queue fail",
605 "seqno %u tid %u BA win <%u:%u> off=%d, qlen=%d, maxqlen=%d",
606 rxseq, tid, rap->rxa_start,
607 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
608 off,
609 mbufq_len(&rap->rxa_mq[off]),
610 rap->rxa_mq[off].mq_maxlen);
611 /* XXX error count */
612 m_freem(m);
613 return CONSUMED;
614 }
615 rap->rxa_qframes++;
616 rap->rxa_qbytes += m->m_pkthdr.len;
617 vap->iv_stats.is_ampdu_rx_reorder++;
618 /*
619 * Statistics for AMSDU decap.
620 */
621 if (rxs != NULL && ieee80211_check_rxseq_amsdu(rxs)) {
622 if (ieee80211_check_rxseq_amsdu_more(rxs)) {
623 /* more=1, AMSDU, end of batch */
624 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
625 } else {
626 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
627 }
628 }
629 } else {
630 IEEE80211_DISCARD_MAC(vap,
631 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
632 ni->ni_macaddr, "a-mpdu duplicate",
633 "seqno %u tid %u BA win <%u:%u>",
634 rxseq, tid, rap->rxa_start,
635 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
636 if (rxs != NULL) {
637 IEEE80211_DISCARD_MAC(vap,
638 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
639 ni->ni_macaddr, "a-mpdu duplicate",
640 "seqno %d tid %u pktflags 0x%08x\n",
641 rxseq, tid, rxs->c_pktflags);
642 }
643 if (rxs_final != NULL) {
644 IEEE80211_DISCARD_MAC(vap,
645 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
646 ni->ni_macaddr, "a-mpdu duplicate",
647 "final: pktflags 0x%08x\n",
648 rxs_final->c_pktflags);
649 }
650 vap->iv_stats.is_rx_dup++;
651 IEEE80211_NODE_STAT(ni, rx_dup);
652 m_freem(m);
653 }
654 return CONSUMED;
655 #undef CONSUMED
656 #undef PROCESS
657 }
658
659 /*
660 * Purge all frames in the A-MPDU re-order queue.
661 */
662 static void
ampdu_rx_purge(struct ieee80211_rx_ampdu * rap)663 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
664 {
665 int i;
666
667 for (i = 0; i < rap->rxa_wnd; i++) {
668 ampdu_rx_purge_slot(rap, i);
669 if (rap->rxa_qframes == 0)
670 break;
671 }
672 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
673 ("lost %u data, %u frames on ampdu rx q",
674 rap->rxa_qbytes, rap->rxa_qframes));
675 }
676
677 static void
ieee80211_ampdu_rx_init_rap(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)678 ieee80211_ampdu_rx_init_rap(struct ieee80211_node *ni,
679 struct ieee80211_rx_ampdu *rap)
680 {
681 int i;
682
683 /* XXX TODO: ensure the queues are empty */
684 memset(rap, 0, sizeof(*rap));
685 for (i = 0; i < IEEE80211_AGGR_BAWMAX; i++)
686 mbufq_init(&rap->rxa_mq[i], 256);
687 }
688
689 /*
690 * Start A-MPDU rx/re-order processing for the specified TID.
691 */
692 static int
ampdu_rx_start(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,int baparamset,int batimeout,int baseqctl)693 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
694 int baparamset, int batimeout, int baseqctl)
695 {
696 struct ieee80211vap *vap = ni->ni_vap;
697 int bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
698
699 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
700 /*
701 * AMPDU previously setup and not terminated with a DELBA,
702 * flush the reorder q's in case anything remains.
703 */
704 ampdu_rx_purge(rap);
705 }
706 ieee80211_ampdu_rx_init_rap(ni, rap);
707 rap->rxa_wnd = (bufsiz == 0) ?
708 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
709 rap->rxa_start = _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_START);
710 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
711
712 /* XXX this should be a configuration flag */
713 if ((vap->iv_htcaps & IEEE80211_HTC_RX_AMSDU_AMPDU) &&
714 (_IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU)))
715 rap->rxa_flags |= IEEE80211_AGGR_AMSDU;
716 else
717 rap->rxa_flags &= ~IEEE80211_AGGR_AMSDU;
718
719 return 0;
720 }
721
722 /*
723 * Public function; manually setup the RX ampdu state.
724 */
725 int
ieee80211_ampdu_rx_start_ext(struct ieee80211_node * ni,int tid,int seq,int baw)726 ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid, int seq, int baw)
727 {
728 struct ieee80211_rx_ampdu *rap;
729
730 /* XXX TODO: sanity check tid, seq, baw */
731
732 rap = &ni->ni_rx_ampdu[tid];
733
734 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
735 /*
736 * AMPDU previously setup and not terminated with a DELBA,
737 * flush the reorder q's in case anything remains.
738 */
739 ampdu_rx_purge(rap);
740 }
741
742 ieee80211_ampdu_rx_init_rap(ni, rap);
743
744 rap->rxa_wnd = (baw== 0) ?
745 IEEE80211_AGGR_BAWMAX : min(baw, IEEE80211_AGGR_BAWMAX);
746 if (seq == -1) {
747 /* Wait for the first RX frame, use that as BAW */
748 rap->rxa_start = 0;
749 rap->rxa_flags |= IEEE80211_AGGR_WAITRX;
750 } else {
751 rap->rxa_start = seq;
752 }
753 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
754
755 /* XXX TODO: no amsdu flag */
756
757 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
758 "%s: tid=%d, start=%d, wnd=%d, flags=0x%08x",
759 __func__,
760 tid,
761 seq,
762 rap->rxa_wnd,
763 rap->rxa_flags);
764
765 return 0;
766 }
767
768 /*
769 * Public function; manually stop the RX AMPDU state.
770 */
771 void
ieee80211_ampdu_rx_stop_ext(struct ieee80211_node * ni,int tid)772 ieee80211_ampdu_rx_stop_ext(struct ieee80211_node *ni, int tid)
773 {
774 struct ieee80211_rx_ampdu *rap;
775
776 /* XXX TODO: sanity check tid, seq, baw */
777 rap = &ni->ni_rx_ampdu[tid];
778 ampdu_rx_stop(ni, rap);
779 }
780
781 /*
782 * Stop A-MPDU rx processing for the specified TID.
783 */
784 static void
ampdu_rx_stop(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)785 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
786 {
787
788 ampdu_rx_purge(rap);
789 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING
790 | IEEE80211_AGGR_XCHGPEND
791 | IEEE80211_AGGR_WAITRX);
792 }
793
794 /*
795 * Dispatch a frame from the A-MPDU reorder queue. The
796 * frame is fed back into ieee80211_input marked with an
797 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
798 * permits ieee80211_input to optimize re-processing).
799 */
800 static __inline void
ampdu_dispatch(struct ieee80211_node * ni,struct mbuf * m)801 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
802 {
803 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
804 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
805 (void) ieee80211_input(ni, m, 0, 0);
806 }
807
808 static int
ampdu_dispatch_slot(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni,int i)809 ampdu_dispatch_slot(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni,
810 int i)
811 {
812 struct mbuf *m;
813 int n = 0;
814
815 for (;;) {
816 m = mbufq_dequeue(&rap->rxa_mq[i]);
817 if (m == NULL)
818 break;
819 n++;
820
821 rap->rxa_qbytes -= m->m_pkthdr.len;
822 rap->rxa_qframes--;
823
824 ampdu_dispatch(ni, m);
825 }
826 return (n);
827 }
828
829 static void
ampdu_rx_moveup(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni,int i,int winstart)830 ampdu_rx_moveup(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni,
831 int i, int winstart)
832 {
833 struct ieee80211vap *vap = ni->ni_vap;
834
835 /*
836 * If frames remain, copy the mbuf pointers down so
837 * they correspond to the offsets in the new window.
838 */
839 if (rap->rxa_qframes != 0) {
840 int n = rap->rxa_qframes, j;
841 for (j = i+1; j < rap->rxa_wnd; j++) {
842 /*
843 * Concat the list contents over, which will
844 * blank the source list for us.
845 */
846 if (mbufq_len(&rap->rxa_mq[j]) != 0) {
847 n = n - mbufq_len(&rap->rxa_mq[j]);
848 mbufq_concat(&rap->rxa_mq[j-i], &rap->rxa_mq[j]);
849 KASSERT(n >= 0, ("%s: n < 0 (%d)", __func__, n));
850 if (n == 0)
851 break;
852 }
853 }
854 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
855 "BA win <%d:%d> winstart %d",
856 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
857 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
858 winstart));
859 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
860 }
861 }
862
863 /*
864 * Dispatch as many frames as possible from the re-order queue.
865 * Frames will always be "at the front"; we process all frames
866 * up to the first empty slot in the window. On completion we
867 * cleanup state if there are still pending frames in the current
868 * BA window. We assume the frame at slot 0 is already handled
869 * by the caller; we always start at slot 1.
870 */
871 static void
ampdu_rx_dispatch(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni)872 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
873 {
874 struct ieee80211vap *vap = ni->ni_vap;
875 int i, r, r2;
876
877 /* flush run of frames */
878 r2 = 0;
879 for (i = 1; i < rap->rxa_wnd; i++) {
880 r = ampdu_dispatch_slot(rap, ni, i);
881 if (r == 0)
882 break;
883 r2 += r;
884 }
885
886 /* move up frames */
887 ampdu_rx_moveup(rap, ni, i, -1);
888
889 /*
890 * Adjust the start of the BA window to
891 * reflect the frames just dispatched.
892 */
893 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
894 vap->iv_stats.is_ampdu_rx_oor += r2;
895
896 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
897 "%s: moved slot up %d slots to start at %d (%d frames)",
898 __func__,
899 i,
900 rap->rxa_start,
901 r2);
902 }
903
904 /*
905 * Dispatch all frames in the A-MPDU re-order queue.
906 */
907 static void
ampdu_rx_flush(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)908 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
909 {
910 int i, r;
911
912 for (i = 0; i < rap->rxa_wnd; i++) {
913 r = ampdu_dispatch_slot(rap, ni, i);
914 if (r == 0)
915 continue;
916 ni->ni_vap->iv_stats.is_ampdu_rx_oor += r;
917
918 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
919 "%s: moved slot up %d slots to start at %d (%d frames)",
920 __func__,
921 1,
922 rap->rxa_start,
923 r);
924
925 if (rap->rxa_qframes == 0)
926 break;
927 }
928 }
929
930 /*
931 * Dispatch all frames in the A-MPDU re-order queue
932 * preceding the specified sequence number. This logic
933 * handles window moves due to a received MSDU or BAR.
934 */
935 static void
ampdu_rx_flush_upto(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,ieee80211_seq winstart)936 ampdu_rx_flush_upto(struct ieee80211_node *ni,
937 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
938 {
939 struct ieee80211vap *vap = ni->ni_vap;
940 ieee80211_seq seqno;
941 int i, r;
942
943 /*
944 * Flush any complete MSDU's with a sequence number lower
945 * than winstart. Gaps may exist. Note that we may actually
946 * dispatch frames past winstart if a run continues; this is
947 * an optimization that avoids having to do a separate pass
948 * to dispatch frames after moving the BA window start.
949 */
950 seqno = rap->rxa_start;
951 for (i = 0; i < rap->rxa_wnd; i++) {
952 if ((r = mbufq_len(&rap->rxa_mq[i])) != 0) {
953 (void) ampdu_dispatch_slot(rap, ni, i);
954 } else {
955 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
956 break;
957 }
958 vap->iv_stats.is_ampdu_rx_oor += r;
959 seqno = IEEE80211_SEQ_INC(seqno);
960
961 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
962 "%s: moved slot up %d slots to start at %d (%d frames)",
963 __func__,
964 1,
965 seqno,
966 r);
967 }
968
969 /*
970 * If frames remain, copy the mbuf pointers down so
971 * they correspond to the offsets in the new window.
972 */
973 ampdu_rx_moveup(rap, ni, i, winstart);
974
975 /*
976 * Move the start of the BA window; we use the
977 * sequence number of the last MSDU that was
978 * passed up the stack+1 or winstart if stopped on
979 * a gap in the reorder buffer.
980 */
981 rap->rxa_start = seqno;
982 }
983
984 /*
985 * Process a received QoS data frame for an HT station. Handle
986 * A-MPDU reordering: if this frame is received out of order
987 * and falls within the BA window hold onto it. Otherwise if
988 * this frame completes a run, flush any pending frames. We
989 * return 1 if the frame is consumed. A 0 is returned if
990 * the frame should be processed normally by the caller.
991 *
992 * A-MSDU: handle hardware decap'ed A-MSDU frames that are
993 * pretending to be MPDU's. They're dispatched directly if
994 * able; or attempted to put into the receive reordering slot.
995 */
996 int
ieee80211_ampdu_reorder(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs)997 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m,
998 const struct ieee80211_rx_stats *rxs)
999 {
1000 #define PROCESS 0 /* caller should process frame */
1001 #define CONSUMED 1 /* frame consumed, caller does nothing */
1002 struct ieee80211vap *vap = ni->ni_vap;
1003 struct ieee80211_qosframe *wh;
1004 struct ieee80211_rx_ampdu *rap;
1005 ieee80211_seq rxseq;
1006 uint8_t tid;
1007 int off;
1008 int amsdu = ieee80211_check_rxseq_amsdu(rxs);
1009 int amsdu_end = ieee80211_check_rxseq_amsdu_more(rxs);
1010
1011 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
1012 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
1013 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1014
1015 /* NB: m_len known to be sufficient */
1016 wh = mtod(m, struct ieee80211_qosframe *);
1017 if (!IEEE80211_IS_QOSDATA(wh)) {
1018 /*
1019 * Not QoS data, shouldn't get here but just
1020 * return it to the caller for processing.
1021 */
1022 return PROCESS;
1023 }
1024
1025 /*
1026 * 802.11-2012 9.3.2.10 - Duplicate detection and recovery.
1027 *
1028 * Multicast QoS data frames are checked against a different
1029 * counter, not the per-TID counter.
1030 */
1031 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
1032 return PROCESS;
1033
1034 tid = ieee80211_getqos(wh)[0];
1035 tid &= IEEE80211_QOS_TID;
1036 rap = &ni->ni_rx_ampdu[tid];
1037 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1038 /*
1039 * No ADDBA request yet, don't touch.
1040 */
1041 return PROCESS;
1042 }
1043 rxseq = le16toh(*(uint16_t *)wh->i_seq);
1044 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
1045 /*
1046 * Fragments are not allowed; toss.
1047 */
1048 IEEE80211_DISCARD_MAC(vap,
1049 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1050 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
1051 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1052 vap->iv_stats.is_ampdu_rx_drop++;
1053 IEEE80211_NODE_STAT(ni, rx_drop);
1054 m_freem(m);
1055 return CONSUMED;
1056 }
1057 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
1058 rap->rxa_nframes++;
1059
1060 /*
1061 * Handle waiting for the first frame to define the BAW.
1062 * Some firmware doesn't provide the RX of the starting point
1063 * of the BAW and we have to cope.
1064 */
1065 if (rap->rxa_flags & IEEE80211_AGGR_WAITRX) {
1066 rap->rxa_flags &= ~IEEE80211_AGGR_WAITRX;
1067 rap->rxa_start = rxseq;
1068 }
1069 again:
1070 if (rxseq == rap->rxa_start) {
1071 /*
1072 * First frame in window.
1073 */
1074 if (rap->rxa_qframes != 0) {
1075 /*
1076 * Dispatch as many packets as we can.
1077 */
1078 KASSERT(mbufq_empty(&rap->rxa_mq[0]), ("unexpected dup"));
1079 ampdu_dispatch(ni, m);
1080 ampdu_rx_dispatch(rap, ni);
1081 return CONSUMED;
1082 } else {
1083 /*
1084 * In order; advance window if needed and notify
1085 * caller to dispatch directly.
1086 */
1087 if (amsdu) {
1088 if (amsdu_end) {
1089 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
1090 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
1091 } else {
1092 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
1093 }
1094 } else {
1095 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
1096 }
1097 return PROCESS;
1098 }
1099 }
1100 /*
1101 * Frame is out of order; store if in the BA window.
1102 */
1103 /* calculate offset in BA window */
1104 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1105 if (off < rap->rxa_wnd) {
1106 /*
1107 * Common case (hopefully): in the BA window.
1108 * Sec 9.10.7.6.2 a) (p.137)
1109 */
1110
1111 /*
1112 * Check for frames sitting too long in the reorder queue.
1113 * This should only ever happen if frames are not delivered
1114 * without the sender otherwise notifying us (e.g. with a
1115 * BAR to move the window). Typically this happens because
1116 * of vendor bugs that cause the sequence number to jump.
1117 * When this happens we get a gap in the reorder queue that
1118 * leaves frame sitting on the queue until they get pushed
1119 * out due to window moves. When the vendor does not send
1120 * BAR this move only happens due to explicit packet sends
1121 *
1122 * NB: we only track the time of the oldest frame in the
1123 * reorder q; this means that if we flush we might push
1124 * frames that still "new"; if this happens then subsequent
1125 * frames will result in BA window moves which cost something
1126 * but is still better than a big throughput dip.
1127 */
1128 if (rap->rxa_qframes != 0) {
1129 /* XXX honor batimeout? */
1130 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1131 /*
1132 * Too long since we received the first
1133 * frame; flush the reorder buffer.
1134 */
1135 if (rap->rxa_qframes != 0) {
1136 vap->iv_stats.is_ampdu_rx_age +=
1137 rap->rxa_qframes;
1138 ampdu_rx_flush(ni, rap);
1139 }
1140 /*
1141 * Advance the window if needed and notify
1142 * the caller to dispatch directly.
1143 */
1144 if (amsdu) {
1145 if (amsdu_end) {
1146 rap->rxa_start =
1147 IEEE80211_SEQ_INC(rxseq);
1148 IEEE80211_NODE_STAT(ni,
1149 rx_amsdu_more_end);
1150 } else {
1151 IEEE80211_NODE_STAT(ni,
1152 rx_amsdu_more);
1153 }
1154 } else {
1155 rap->rxa_start =
1156 IEEE80211_SEQ_INC(rxseq);
1157 }
1158 return PROCESS;
1159 }
1160 } else {
1161 /*
1162 * First frame, start aging timer.
1163 */
1164 rap->rxa_age = ticks;
1165 }
1166
1167 /* save packet - this consumes, no matter what */
1168 ampdu_rx_add_slot(rap, off, tid, rxseq, ni, m, rxs);
1169 return CONSUMED;
1170 }
1171 if (off < IEEE80211_SEQ_BA_RANGE) {
1172 /*
1173 * Outside the BA window, but within range;
1174 * flush the reorder q and move the window.
1175 * Sec 9.10.7.6.2 b) (p.138)
1176 */
1177 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1178 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
1179 rap->rxa_start,
1180 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1181 rap->rxa_qframes, rxseq, tid);
1182 vap->iv_stats.is_ampdu_rx_move++;
1183
1184 /*
1185 * The spec says to flush frames up to but not including:
1186 * WinStart_B = rxseq - rap->rxa_wnd + 1
1187 * Then insert the frame or notify the caller to process
1188 * it immediately. We can safely do this by just starting
1189 * over again because we know the frame will now be within
1190 * the BA window.
1191 */
1192 /* NB: rxa_wnd known to be >0 */
1193 ampdu_rx_flush_upto(ni, rap,
1194 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
1195 goto again;
1196 } else {
1197 /*
1198 * Outside the BA window and out of range; toss.
1199 * Sec 9.10.7.6.2 c) (p.138)
1200 */
1201 IEEE80211_DISCARD_MAC(vap,
1202 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1203 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1204 rap->rxa_start,
1205 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1206 rap->rxa_qframes, rxseq, tid,
1207 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1208 vap->iv_stats.is_ampdu_rx_drop++;
1209 IEEE80211_NODE_STAT(ni, rx_drop);
1210 m_freem(m);
1211 return CONSUMED;
1212 }
1213 #undef CONSUMED
1214 #undef PROCESS
1215 }
1216
1217 /*
1218 * Process a BAR ctl frame. Dispatch all frames up to
1219 * the sequence number of the frame. If this frame is
1220 * out of range it's discarded.
1221 */
1222 void
ieee80211_recv_bar(struct ieee80211_node * ni,struct mbuf * m0)1223 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
1224 {
1225 struct ieee80211vap *vap = ni->ni_vap;
1226 struct ieee80211_frame_bar *wh;
1227 struct ieee80211_rx_ampdu *rap;
1228 ieee80211_seq rxseq;
1229 int tid, off;
1230
1231 if (!ieee80211_recv_bar_ena) {
1232 #if 0
1233 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
1234 ni->ni_macaddr, "BAR", "%s", "processing disabled");
1235 #endif
1236 vap->iv_stats.is_ampdu_bar_bad++;
1237 return;
1238 }
1239 wh = mtod(m0, struct ieee80211_frame_bar *);
1240 /* XXX check basic BAR */
1241 tid = _IEEE80211_MASKSHIFT(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
1242 rap = &ni->ni_rx_ampdu[tid];
1243 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1244 /*
1245 * No ADDBA request yet, don't touch.
1246 */
1247 IEEE80211_DISCARD_MAC(vap,
1248 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
1249 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
1250 vap->iv_stats.is_ampdu_bar_bad++;
1251 return;
1252 }
1253 vap->iv_stats.is_ampdu_bar_rx++;
1254 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
1255 if (rxseq == rap->rxa_start)
1256 return;
1257 /* calculate offset in BA window */
1258 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1259 if (off < IEEE80211_SEQ_BA_RANGE) {
1260 /*
1261 * Flush the reorder q up to rxseq and move the window.
1262 * Sec 9.10.7.6.3 a) (p.138)
1263 */
1264 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1265 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
1266 rap->rxa_start,
1267 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1268 rap->rxa_qframes, rxseq, tid);
1269 vap->iv_stats.is_ampdu_bar_move++;
1270
1271 ampdu_rx_flush_upto(ni, rap, rxseq);
1272 if (off >= rap->rxa_wnd) {
1273 /*
1274 * BAR specifies a window start to the right of BA
1275 * window; we must move it explicitly since
1276 * ampdu_rx_flush_upto will not.
1277 */
1278 rap->rxa_start = rxseq;
1279 }
1280 } else {
1281 /*
1282 * Out of range; toss.
1283 * Sec 9.10.7.6.3 b) (p.138)
1284 */
1285 IEEE80211_DISCARD_MAC(vap,
1286 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1287 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1288 rap->rxa_start,
1289 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1290 rap->rxa_qframes, rxseq, tid,
1291 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1292 vap->iv_stats.is_ampdu_bar_oow++;
1293 IEEE80211_NODE_STAT(ni, rx_drop);
1294 }
1295 }
1296
1297 /*
1298 * Setup HT-specific state in a node. Called only
1299 * when HT use is negotiated so we don't do extra
1300 * work for temporary and/or legacy sta's.
1301 */
1302 void
ieee80211_ht_node_init(struct ieee80211_node * ni)1303 ieee80211_ht_node_init(struct ieee80211_node *ni)
1304 {
1305 struct ieee80211_tx_ampdu *tap;
1306 int tid;
1307
1308 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1309 ni,
1310 "%s: called (%p)",
1311 __func__,
1312 ni);
1313
1314 if (ni->ni_flags & IEEE80211_NODE_HT) {
1315 /*
1316 * Clean AMPDU state on re-associate. This handles the case
1317 * where a station leaves w/o notifying us and then returns
1318 * before node is reaped for inactivity.
1319 */
1320 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1321 ni,
1322 "%s: calling cleanup (%p)",
1323 __func__, ni);
1324 ieee80211_ht_node_cleanup(ni);
1325 }
1326 for (tid = 0; tid < WME_NUM_TID; tid++) {
1327 tap = &ni->ni_tx_ampdu[tid];
1328 tap->txa_tid = tid;
1329 tap->txa_ni = ni;
1330 ieee80211_txampdu_init_pps(tap);
1331 /* NB: further initialization deferred */
1332 ieee80211_ampdu_rx_init_rap(ni, &ni->ni_rx_ampdu[tid]);
1333 }
1334 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU |
1335 IEEE80211_NODE_AMSDU;
1336 }
1337
1338 /*
1339 * Cleanup HT-specific state in a node. Called only
1340 * when HT use has been marked.
1341 */
1342 void
ieee80211_ht_node_cleanup(struct ieee80211_node * ni)1343 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1344 {
1345 struct ieee80211com *ic = ni->ni_ic;
1346 int i;
1347
1348 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1349 ni,
1350 "%s: called (%p)",
1351 __func__, ni);
1352
1353 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1354
1355 /* XXX optimize this */
1356 for (i = 0; i < WME_NUM_TID; i++) {
1357 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1358 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1359 ampdu_tx_stop(tap);
1360 }
1361 for (i = 0; i < WME_NUM_TID; i++)
1362 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1363
1364 ni->ni_htcap = 0;
1365 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1366 }
1367
1368 /*
1369 * Age out HT resources for a station.
1370 */
1371 void
ieee80211_ht_node_age(struct ieee80211_node * ni)1372 ieee80211_ht_node_age(struct ieee80211_node *ni)
1373 {
1374 struct ieee80211vap *vap = ni->ni_vap;
1375 uint8_t tid;
1376
1377 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1378
1379 for (tid = 0; tid < WME_NUM_TID; tid++) {
1380 struct ieee80211_rx_ampdu *rap;
1381
1382 rap = &ni->ni_rx_ampdu[tid];
1383 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1384 continue;
1385 if (rap->rxa_qframes == 0)
1386 continue;
1387 /*
1388 * Check for frames sitting too long in the reorder queue.
1389 * See above for more details on what's happening here.
1390 */
1391 /* XXX honor batimeout? */
1392 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1393 /*
1394 * Too long since we received the first
1395 * frame; flush the reorder buffer.
1396 */
1397 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1398 ampdu_rx_flush(ni, rap);
1399 }
1400 }
1401 }
1402
1403 static struct ieee80211_channel *
findhtchan(struct ieee80211com * ic,struct ieee80211_channel * c,int htflags)1404 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1405 {
1406 return ieee80211_find_channel(ic, c->ic_freq,
1407 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1408 }
1409
1410 /*
1411 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1412 */
1413 struct ieee80211_channel *
ieee80211_ht_adjust_channel(struct ieee80211com * ic,struct ieee80211_channel * chan,int flags)1414 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1415 struct ieee80211_channel *chan, int flags)
1416 {
1417 struct ieee80211_channel *c;
1418
1419 if (flags & IEEE80211_FHT_HT) {
1420 /* promote to HT if possible */
1421 if (flags & IEEE80211_FHT_USEHT40) {
1422 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1423 /* NB: arbitrarily pick ht40+ over ht40- */
1424 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1425 if (c == NULL)
1426 c = findhtchan(ic, chan,
1427 IEEE80211_CHAN_HT40D);
1428 if (c == NULL)
1429 c = findhtchan(ic, chan,
1430 IEEE80211_CHAN_HT20);
1431 if (c != NULL)
1432 chan = c;
1433 }
1434 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1435 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1436 if (c != NULL)
1437 chan = c;
1438 }
1439 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1440 /* demote to legacy, HT use is disabled */
1441 c = ieee80211_find_channel(ic, chan->ic_freq,
1442 chan->ic_flags &~ IEEE80211_CHAN_HT);
1443 if (c != NULL)
1444 chan = c;
1445 }
1446 return chan;
1447 }
1448
1449 /*
1450 * Setup HT-specific state for a legacy WDS peer.
1451 */
1452 void
ieee80211_ht_wds_init(struct ieee80211_node * ni)1453 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1454 {
1455 struct ieee80211vap *vap = ni->ni_vap;
1456 struct ieee80211_tx_ampdu *tap;
1457 int tid;
1458
1459 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1460
1461 /* XXX check scan cache in case peer has an ap and we have info */
1462 /*
1463 * If setup with a legacy channel; locate an HT channel.
1464 * Otherwise if the inherited channel (from a companion
1465 * AP) is suitable use it so we use the same location
1466 * for the extension channel).
1467 */
1468 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1469 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1470
1471 ni->ni_htcap = 0;
1472 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1473 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1474 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1475 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1476 ni->ni_chw = IEEE80211_STA_RX_BW_40;
1477 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1478 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1479 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1480 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1481 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1482 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1483 } else {
1484 ni->ni_chw = IEEE80211_STA_RX_BW_20;
1485 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1486 }
1487 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1488 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1489 ni->ni_flags |= IEEE80211_NODE_RIFS;
1490 /* XXX does it make sense to enable SMPS? */
1491
1492 ni->ni_htopmode = 0; /* XXX need protection state */
1493 ni->ni_htstbc = 0; /* XXX need info */
1494
1495 for (tid = 0; tid < WME_NUM_TID; tid++) {
1496 tap = &ni->ni_tx_ampdu[tid];
1497 tap->txa_tid = tid;
1498 ieee80211_txampdu_init_pps(tap);
1499 }
1500 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1501 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU |
1502 IEEE80211_NODE_AMSDU;
1503 }
1504
1505 /*
1506 * Notify a VAP of a change in the HTINFO ie if it's a hostap VAP.
1507 *
1508 * This is to be called from the deferred HT protection update
1509 * task once the flags are updated.
1510 */
1511 void
ieee80211_htinfo_notify(struct ieee80211vap * vap)1512 ieee80211_htinfo_notify(struct ieee80211vap *vap)
1513 {
1514
1515 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1516
1517 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1518 return;
1519 if (vap->iv_state != IEEE80211_S_RUN ||
1520 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1521 return;
1522
1523 IEEE80211_NOTE(vap,
1524 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1525 vap->iv_bss,
1526 "HT bss occupancy change: %d sta, %d ht, "
1527 "%d ht40%s, HT protmode now 0x%x"
1528 , vap->iv_sta_assoc
1529 , vap->iv_ht_sta_assoc
1530 , vap->iv_ht40_sta_assoc
1531 , (vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1532 ", non-HT sta present" : ""
1533 , vap->iv_curhtprotmode);
1534
1535 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1536 }
1537
1538 /*
1539 * Calculate HT protection mode from current
1540 * state and handle updates.
1541 */
1542 static void
htinfo_update(struct ieee80211vap * vap)1543 htinfo_update(struct ieee80211vap *vap)
1544 {
1545 struct ieee80211com *ic = vap->iv_ic;
1546 uint8_t protmode;
1547
1548 if (vap->iv_sta_assoc != vap->iv_ht_sta_assoc) {
1549 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1550 | IEEE80211_HTINFO_NONHT_PRESENT;
1551 } else if (vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) {
1552 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1553 | IEEE80211_HTINFO_NONHT_PRESENT;
1554 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1555 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1556 vap->iv_sta_assoc != vap->iv_ht40_sta_assoc) {
1557 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1558 } else {
1559 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1560 }
1561 if (protmode != vap->iv_curhtprotmode) {
1562 vap->iv_curhtprotmode = protmode;
1563 /* Update VAP with new protection mode */
1564 ieee80211_vap_update_ht_protmode(vap);
1565 }
1566 }
1567
1568 /*
1569 * Handle an HT station joining a BSS.
1570 */
1571 void
ieee80211_ht_node_join(struct ieee80211_node * ni)1572 ieee80211_ht_node_join(struct ieee80211_node *ni)
1573 {
1574 struct ieee80211vap *vap = ni->ni_vap;
1575
1576 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1577
1578 if (ni->ni_flags & IEEE80211_NODE_HT) {
1579 vap->iv_ht_sta_assoc++;
1580 if (ni->ni_chw == IEEE80211_STA_RX_BW_40)
1581 vap->iv_ht40_sta_assoc++;
1582 }
1583 htinfo_update(vap);
1584 }
1585
1586 /*
1587 * Handle an HT station leaving a BSS.
1588 */
1589 void
ieee80211_ht_node_leave(struct ieee80211_node * ni)1590 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1591 {
1592 struct ieee80211vap *vap = ni->ni_vap;
1593
1594 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1595
1596 if (ni->ni_flags & IEEE80211_NODE_HT) {
1597 vap->iv_ht_sta_assoc--;
1598 if (ni->ni_chw == IEEE80211_STA_RX_BW_40)
1599 vap->iv_ht40_sta_assoc--;
1600 }
1601 htinfo_update(vap);
1602 }
1603
1604 /*
1605 * Public version of htinfo_update; used for processing
1606 * beacon frames from overlapping bss.
1607 *
1608 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1609 * (on receipt of a beacon that advertises MIXED) or
1610 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1611 * from an overlapping legacy bss). We treat MIXED with
1612 * a higher precedence than PROTOPT (i.e. we will not change
1613 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1614 * corresponds to how we handle things in htinfo_update.
1615 *
1616 */
1617 void
ieee80211_htprot_update(struct ieee80211vap * vap,int protmode)1618 ieee80211_htprot_update(struct ieee80211vap *vap, int protmode)
1619 {
1620 struct ieee80211com *ic = vap->iv_ic;
1621 #define OPMODE(x) _IEEE80211_SHIFTMASK(x, IEEE80211_HTINFO_OPMODE)
1622 IEEE80211_LOCK(ic);
1623
1624 /* track non-HT station presence */
1625 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1626 ("protmode 0x%x", protmode));
1627 vap->iv_flags_ht |= IEEE80211_FHT_NONHT_PR;
1628 vap->iv_lastnonht = ticks;
1629
1630 if (protmode != vap->iv_curhtprotmode &&
1631 (OPMODE(vap->iv_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1632 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1633 vap->iv_curhtprotmode = protmode;
1634 /* Update VAP with new protection mode */
1635 ieee80211_vap_update_ht_protmode(vap);
1636 }
1637 IEEE80211_UNLOCK(ic);
1638 #undef OPMODE
1639 }
1640
1641 /*
1642 * Time out presence of an overlapping bss with non-HT
1643 * stations. When operating in hostap mode we listen for
1644 * beacons from other stations and if we identify a non-HT
1645 * station is present we update the opmode field of the
1646 * HTINFO ie. To identify when all non-HT stations are
1647 * gone we time out this condition.
1648 */
1649 void
ieee80211_ht_timeout(struct ieee80211vap * vap)1650 ieee80211_ht_timeout(struct ieee80211vap *vap)
1651 {
1652
1653 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1654
1655 if ((vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1656 ieee80211_time_after(ticks, vap->iv_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1657 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
1658 "%s", "time out non-HT STA present on channel");
1659 vap->iv_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1660 htinfo_update(vap);
1661 }
1662 }
1663
1664 /*
1665 * Process an 802.11n HT capabilities ie.
1666 */
1667 void
ieee80211_parse_htcap(struct ieee80211_node * ni,const uint8_t * ie)1668 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1669 {
1670 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1671 /*
1672 * Station used Vendor OUI ie to associate;
1673 * mark the node so when we respond we'll use
1674 * the Vendor OUI's and not the standard ie's.
1675 */
1676 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1677 ie += 4;
1678 } else
1679 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1680
1681 ni->ni_htcap = le16dec(ie +
1682 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1683 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1684 }
1685
1686 static void
htinfo_parse(struct ieee80211_node * ni,const struct ieee80211_ie_htinfo * htinfo)1687 htinfo_parse(struct ieee80211_node *ni,
1688 const struct ieee80211_ie_htinfo *htinfo)
1689 {
1690 uint16_t w;
1691
1692 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1693 ni->ni_ht2ndchan = _IEEE80211_SHIFTMASK(htinfo->hi_byte1,
1694 IEEE80211_HTINFO_2NDCHAN);
1695 w = le16dec(&htinfo->hi_byte2);
1696 ni->ni_htopmode = _IEEE80211_SHIFTMASK(w, IEEE80211_HTINFO_OPMODE);
1697 w = le16dec(&htinfo->hi_byte45);
1698 ni->ni_htstbc = _IEEE80211_SHIFTMASK(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1699 }
1700
1701 /*
1702 * Parse an 802.11n HT info ie and save useful information
1703 * to the node state. Note this does not effect any state
1704 * changes such as for channel width change.
1705 */
1706 void
ieee80211_parse_htinfo(struct ieee80211_node * ni,const uint8_t * ie)1707 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1708 {
1709 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1710 ie += 4;
1711 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1712 }
1713
1714 /*
1715 * Handle 11n/11ac channel switch.
1716 *
1717 * Use the received HT/VHT ie's to identify the right channel to use.
1718 * If we cannot locate it in the channel table then fallback to
1719 * legacy operation.
1720 *
1721 * Note that we use this information to identify the node's
1722 * channel only; the caller is responsible for insuring any
1723 * required channel change is done (e.g. in sta mode when
1724 * parsing the contents of a beacon frame).
1725 */
1726 static int
htinfo_update_chw(struct ieee80211_node * ni,int htflags,int vhtflags)1727 htinfo_update_chw(struct ieee80211_node *ni, int htflags, int vhtflags)
1728 {
1729 struct ieee80211com *ic = ni->ni_ic;
1730 struct ieee80211_channel *c;
1731 int chanflags;
1732 int ret = 0;
1733
1734 /*
1735 * First step - do HT/VHT only channel lookup based on operating mode
1736 * flags. This involves masking out the VHT flags as well.
1737 * Otherwise we end up doing the full channel walk each time
1738 * we trigger this, which is expensive.
1739 */
1740 chanflags = (ni->ni_chan->ic_flags &~
1741 (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT)) | htflags | vhtflags;
1742
1743 if (chanflags == ni->ni_chan->ic_flags)
1744 goto done;
1745
1746 /*
1747 * If HT /or/ VHT flags have changed then check both.
1748 * We need to start by picking a HT channel anyway.
1749 */
1750
1751 c = NULL;
1752 chanflags = (ni->ni_chan->ic_flags &~
1753 (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT)) | htflags;
1754 /* XXX not right for ht40- */
1755 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1756 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1757 /*
1758 * No HT40 channel entry in our table; fall back
1759 * to HT20 operation. This should not happen.
1760 */
1761 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1762 #if 0
1763 IEEE80211_NOTE(ni->ni_vap,
1764 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1765 "no HT40 channel (freq %u), falling back to HT20",
1766 ni->ni_chan->ic_freq);
1767 #endif
1768 /* XXX stat */
1769 }
1770
1771 /* Nothing found - leave it alone; move onto VHT */
1772 if (c == NULL)
1773 c = ni->ni_chan;
1774
1775 /*
1776 * If it's non-HT, then bail out now.
1777 */
1778 if (! IEEE80211_IS_CHAN_HT(c)) {
1779 IEEE80211_NOTE(ni->ni_vap,
1780 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1781 "not HT; skipping VHT check (%u/0x%x)",
1782 c->ic_freq, c->ic_flags);
1783 goto done;
1784 }
1785
1786 /*
1787 * Next step - look at the current VHT flags and determine
1788 * if we need to upgrade. Mask out the VHT and HT flags since
1789 * the vhtflags field will already have the correct HT
1790 * flags to use.
1791 */
1792 if (IEEE80211_CONF_VHT(ic) && ni->ni_vhtcap != 0 && vhtflags != 0) {
1793 chanflags = (c->ic_flags
1794 &~ (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT))
1795 | vhtflags;
1796 IEEE80211_NOTE(ni->ni_vap,
1797 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1798 ni,
1799 "%s: VHT; chanwidth=0x%02x; vhtflags=0x%08x",
1800 __func__, ni->ni_vht_chanwidth, vhtflags);
1801
1802 IEEE80211_NOTE(ni->ni_vap,
1803 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1804 ni,
1805 "%s: VHT; trying lookup for %d/0x%08x",
1806 __func__, c->ic_freq, chanflags);
1807 c = ieee80211_find_channel(ic, c->ic_freq, chanflags);
1808 }
1809
1810 /* Finally, if it's changed */
1811 if (c != NULL && c != ni->ni_chan) {
1812 IEEE80211_NOTE(ni->ni_vap,
1813 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1814 "switch station to %s%d channel %u/0x%x",
1815 IEEE80211_IS_CHAN_VHT(c) ? "VHT" : "HT",
1816 IEEE80211_IS_CHAN_VHT80(c) ? 80 :
1817 (IEEE80211_IS_CHAN_HT40(c) ? 40 : 20),
1818 c->ic_freq, c->ic_flags);
1819 ni->ni_chan = c;
1820 ret = 1;
1821 }
1822 /* NB: caller responsible for forcing any channel change */
1823
1824 done:
1825 /* update node's (11n) tx channel width */
1826 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
1827 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
1828 return (ret);
1829 }
1830
1831 /*
1832 * Update 11n MIMO PS state according to received htcap.
1833 */
1834 static __inline int
htcap_update_mimo_ps(struct ieee80211_node * ni)1835 htcap_update_mimo_ps(struct ieee80211_node *ni)
1836 {
1837 uint16_t oflags = ni->ni_flags;
1838
1839 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1840 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1841 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1842 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1843 break;
1844 case IEEE80211_HTCAP_SMPS_ENA:
1845 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1846 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1847 break;
1848 case IEEE80211_HTCAP_SMPS_OFF:
1849 default: /* disable on rx of reserved value */
1850 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1851 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1852 break;
1853 }
1854 return (oflags ^ ni->ni_flags);
1855 }
1856
1857 /*
1858 * Update short GI state according to received htcap
1859 * and local settings.
1860 */
1861 static __inline void
htcap_update_shortgi(struct ieee80211_node * ni)1862 htcap_update_shortgi(struct ieee80211_node *ni)
1863 {
1864 struct ieee80211vap *vap = ni->ni_vap;
1865
1866 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1867 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1868 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1869 ni->ni_flags |= IEEE80211_NODE_SGI20;
1870 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1871 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1872 ni->ni_flags |= IEEE80211_NODE_SGI40;
1873 }
1874
1875 /*
1876 * Update LDPC state according to received htcap
1877 * and local settings.
1878 */
1879 static __inline void
htcap_update_ldpc(struct ieee80211_node * ni)1880 htcap_update_ldpc(struct ieee80211_node *ni)
1881 {
1882 struct ieee80211vap *vap = ni->ni_vap;
1883
1884 if ((ni->ni_htcap & IEEE80211_HTCAP_LDPC) &&
1885 (vap->iv_flags_ht & IEEE80211_FHT_LDPC_TX))
1886 ni->ni_flags |= IEEE80211_NODE_LDPC;
1887 }
1888
1889 /*
1890 * Parse and update HT-related state extracted from
1891 * the HT cap and info ie's.
1892 *
1893 * This is called from the STA management path and
1894 * the ieee80211_node_join() path. It will take into
1895 * account the IEs discovered during scanning and
1896 * adjust things accordingly.
1897 */
1898 void
ieee80211_ht_updateparams(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)1899 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1900 const uint8_t *htcapie, const uint8_t *htinfoie)
1901 {
1902 struct ieee80211vap *vap = ni->ni_vap;
1903 const struct ieee80211_ie_htinfo *htinfo;
1904
1905 ieee80211_parse_htcap(ni, htcapie);
1906 if (vap->iv_htcaps & IEEE80211_HTC_SMPS)
1907 htcap_update_mimo_ps(ni);
1908 htcap_update_shortgi(ni);
1909 htcap_update_ldpc(ni);
1910
1911 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1912 htinfoie += 4;
1913 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1914 htinfo_parse(ni, htinfo);
1915
1916 /*
1917 * Defer the node channel change; we need to now
1918 * update VHT parameters before we do it.
1919 */
1920
1921 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1922 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1923 ni->ni_flags |= IEEE80211_NODE_RIFS;
1924 else
1925 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1926 }
1927
1928 static uint32_t
ieee80211_vht_get_vhtflags(struct ieee80211_node * ni,uint32_t htflags)1929 ieee80211_vht_get_vhtflags(struct ieee80211_node *ni, uint32_t htflags)
1930 {
1931 struct ieee80211vap *vap = ni->ni_vap;
1932 uint32_t vhtflags = 0;
1933
1934 vhtflags = 0;
1935 if (ni->ni_flags & IEEE80211_NODE_VHT && vap->iv_vht_flags & IEEE80211_FVHT_VHT) {
1936 if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_160MHZ) &&
1937 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(vap->iv_vht_cap.vht_cap_info) &&
1938 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT160)) {
1939 vhtflags = IEEE80211_CHAN_VHT160;
1940 /* Mirror the HT40 flags */
1941 if (htflags == IEEE80211_CHAN_HT40U) {
1942 vhtflags |= IEEE80211_CHAN_HT40U;
1943 } else if (htflags == IEEE80211_CHAN_HT40D) {
1944 vhtflags |= IEEE80211_CHAN_HT40D;
1945 }
1946 } else if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_80P80MHZ) &&
1947 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(vap->iv_vht_cap.vht_cap_info) &&
1948 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT80P80)) {
1949 vhtflags = IEEE80211_CHAN_VHT80P80;
1950 /* Mirror the HT40 flags */
1951 if (htflags == IEEE80211_CHAN_HT40U) {
1952 vhtflags |= IEEE80211_CHAN_HT40U;
1953 } else if (htflags == IEEE80211_CHAN_HT40D) {
1954 vhtflags |= IEEE80211_CHAN_HT40D;
1955 }
1956 } else if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_80MHZ) &&
1957 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT80)) {
1958 vhtflags = IEEE80211_CHAN_VHT80;
1959 /* Mirror the HT40 flags */
1960 if (htflags == IEEE80211_CHAN_HT40U) {
1961 vhtflags |= IEEE80211_CHAN_HT40U;
1962 } else if (htflags == IEEE80211_CHAN_HT40D) {
1963 vhtflags |= IEEE80211_CHAN_HT40D;
1964 }
1965 } else if (ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_USE_HT) {
1966 /* Mirror the HT40 flags */
1967 /*
1968 * XXX TODO: if ht40 is disabled, but vht40 isn't
1969 * disabled then this logic will get very, very sad.
1970 * It's quite possible the only sane thing to do is
1971 * to not have vht40 as an option, and just obey
1972 * 'ht40' as that flag.
1973 */
1974 if ((htflags == IEEE80211_CHAN_HT40U) &&
1975 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT40)) {
1976 vhtflags = IEEE80211_CHAN_VHT40U
1977 | IEEE80211_CHAN_HT40U;
1978 } else if (htflags == IEEE80211_CHAN_HT40D &&
1979 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT40)) {
1980 vhtflags = IEEE80211_CHAN_VHT40D
1981 | IEEE80211_CHAN_HT40D;
1982 } else if (htflags == IEEE80211_CHAN_HT20) {
1983 vhtflags = IEEE80211_CHAN_VHT20
1984 | IEEE80211_CHAN_HT20;
1985 }
1986 } else {
1987 vhtflags = IEEE80211_CHAN_VHT20;
1988 }
1989 }
1990 return (vhtflags);
1991 }
1992
1993 /*
1994 * Final part of updating the HT parameters.
1995 *
1996 * This is called from the STA management path and
1997 * the ieee80211_node_join() path. It will take into
1998 * account the IEs discovered during scanning and
1999 * adjust things accordingly.
2000 *
2001 * This is done after a call to ieee80211_ht_updateparams()
2002 * because it (and the upcoming VHT version of updateparams)
2003 * needs to ensure everything is parsed before htinfo_update_chw()
2004 * is called - which will change the channel config for the
2005 * node for us.
2006 */
2007 int
ieee80211_ht_updateparams_final(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)2008 ieee80211_ht_updateparams_final(struct ieee80211_node *ni,
2009 const uint8_t *htcapie, const uint8_t *htinfoie)
2010 {
2011 struct ieee80211vap *vap = ni->ni_vap;
2012 const struct ieee80211_ie_htinfo *htinfo;
2013 int htflags, vhtflags;
2014 int ret = 0;
2015
2016 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
2017
2018 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
2019 IEEE80211_CHAN_HT20 : 0;
2020
2021 /* NB: honor operating mode constraint */
2022 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
2023 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
2024 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
2025 htflags = IEEE80211_CHAN_HT40U;
2026 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
2027 htflags = IEEE80211_CHAN_HT40D;
2028 }
2029
2030 /*
2031 * VHT flags - do much the same; check whether VHT is available
2032 * and if so, what our ideal channel use would be based on our
2033 * capabilities and the (pre-parsed) VHT info IE.
2034 */
2035 vhtflags = ieee80211_vht_get_vhtflags(ni, htflags);
2036
2037 if (htinfo_update_chw(ni, htflags, vhtflags))
2038 ret = 1;
2039
2040 return (ret);
2041 }
2042
2043 /*
2044 * Parse and update HT-related state extracted from the HT cap ie
2045 * for a station joining an HT BSS.
2046 *
2047 * This is called from the hostap path for each station.
2048 */
2049 void
ieee80211_ht_updatehtcap(struct ieee80211_node * ni,const uint8_t * htcapie)2050 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
2051 {
2052 struct ieee80211vap *vap = ni->ni_vap;
2053
2054 ieee80211_parse_htcap(ni, htcapie);
2055 if (vap->iv_htcaps & IEEE80211_HTC_SMPS)
2056 htcap_update_mimo_ps(ni);
2057 htcap_update_shortgi(ni);
2058 htcap_update_ldpc(ni);
2059 }
2060
2061 /*
2062 * Called once HT and VHT capabilities are parsed in hostap mode -
2063 * this will adjust the channel configuration of the given node
2064 * based on the configuration and capabilities.
2065 */
2066 void
ieee80211_ht_updatehtcap_final(struct ieee80211_node * ni)2067 ieee80211_ht_updatehtcap_final(struct ieee80211_node *ni)
2068 {
2069 struct ieee80211vap *vap = ni->ni_vap;
2070 int htflags;
2071 int vhtflags;
2072
2073 /* NB: honor operating mode constraint */
2074 /* XXX 40 MHz intolerant */
2075 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
2076 IEEE80211_CHAN_HT20 : 0;
2077 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
2078 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
2079 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
2080 htflags = IEEE80211_CHAN_HT40U;
2081 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
2082 htflags = IEEE80211_CHAN_HT40D;
2083 }
2084 /*
2085 * VHT flags - do much the same; check whether VHT is available
2086 * and if so, what our ideal channel use would be based on our
2087 * capabilities and the (pre-parsed) VHT info IE.
2088 */
2089 vhtflags = ieee80211_vht_get_vhtflags(ni, htflags);
2090
2091 (void) htinfo_update_chw(ni, htflags, vhtflags);
2092 }
2093
2094 /*
2095 * Install received HT rate set by parsing the HT cap ie.
2096 */
2097 int
ieee80211_setup_htrates(struct ieee80211_node * ni,const uint8_t * ie,int flags)2098 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
2099 {
2100 struct ieee80211com *ic = ni->ni_ic;
2101 struct ieee80211vap *vap = ni->ni_vap;
2102 const struct ieee80211_ie_htcap *htcap;
2103 struct ieee80211_htrateset *rs;
2104 int i, maxequalmcs, maxunequalmcs;
2105
2106 maxequalmcs = ic->ic_txstream * 8 - 1;
2107 maxunequalmcs = 0;
2108 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
2109 if (ic->ic_txstream >= 2)
2110 maxunequalmcs = 38;
2111 if (ic->ic_txstream >= 3)
2112 maxunequalmcs = 52;
2113 if (ic->ic_txstream >= 4)
2114 maxunequalmcs = 76;
2115 }
2116
2117 rs = &ni->ni_htrates;
2118 memset(rs, 0, sizeof(*rs));
2119 if (ie != NULL) {
2120 if (ie[0] == IEEE80211_ELEMID_VENDOR)
2121 ie += 4;
2122 htcap = (const struct ieee80211_ie_htcap *) ie;
2123 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
2124 if (isclr(htcap->hc_mcsset, i))
2125 continue;
2126 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
2127 IEEE80211_NOTE(vap,
2128 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
2129 "WARNING, HT rate set too large; only "
2130 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
2131 vap->iv_stats.is_rx_rstoobig++;
2132 break;
2133 }
2134 if (i <= 31 && i > maxequalmcs)
2135 continue;
2136 if (i == 32 &&
2137 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
2138 continue;
2139 if (i > 32 && i > maxunequalmcs)
2140 continue;
2141 rs->rs_rates[rs->rs_nrates++] = i;
2142 }
2143 }
2144 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
2145 }
2146
2147 /*
2148 * Mark rates in a node's HT rate set as basic according
2149 * to the information in the supplied HT info ie.
2150 */
2151 void
ieee80211_setup_basic_htrates(struct ieee80211_node * ni,const uint8_t * ie)2152 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
2153 {
2154 const struct ieee80211_ie_htinfo *htinfo;
2155 struct ieee80211_htrateset *rs;
2156 int i, j;
2157
2158 if (ie[0] == IEEE80211_ELEMID_VENDOR)
2159 ie += 4;
2160 htinfo = (const struct ieee80211_ie_htinfo *) ie;
2161 rs = &ni->ni_htrates;
2162 if (rs->rs_nrates == 0) {
2163 IEEE80211_NOTE(ni->ni_vap,
2164 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
2165 "%s", "WARNING, empty HT rate set");
2166 return;
2167 }
2168 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
2169 if (isclr(htinfo->hi_basicmcsset, i))
2170 continue;
2171 for (j = 0; j < rs->rs_nrates; j++)
2172 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
2173 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
2174 }
2175 }
2176
2177 static void
ampdu_tx_setup(struct ieee80211_tx_ampdu * tap)2178 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
2179 {
2180 callout_init(&tap->txa_timer, 1);
2181 tap->txa_flags |= IEEE80211_AGGR_SETUP;
2182 tap->txa_lastsample = ticks;
2183 }
2184
2185 static void
ampdu_tx_stop(struct ieee80211_tx_ampdu * tap)2186 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
2187 {
2188 struct ieee80211_node *ni = tap->txa_ni;
2189 struct ieee80211com *ic = ni->ni_ic;
2190
2191 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2192 tap->txa_ni,
2193 "%s: called",
2194 __func__);
2195
2196 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
2197 ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
2198 TID_TO_WME_AC(tap->txa_tid)));
2199
2200 /*
2201 * Stop BA stream if setup so driver has a chance
2202 * to reclaim any resources it might have allocated.
2203 */
2204 ic->ic_addba_stop(ni, tap);
2205 /*
2206 * Stop any pending BAR transmit.
2207 */
2208 bar_stop_timer(tap);
2209
2210 /*
2211 * Reset packet estimate.
2212 */
2213 ieee80211_txampdu_init_pps(tap);
2214
2215 /* NB: clearing NAK means we may re-send ADDBA */
2216 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
2217 }
2218
2219 /*
2220 * ADDBA response timeout.
2221 *
2222 * If software aggregation and per-TID queue management was done here,
2223 * that queue would be unpaused after the ADDBA timeout occurs.
2224 */
2225 static void
addba_timeout(void * arg)2226 addba_timeout(void *arg)
2227 {
2228 struct ieee80211_tx_ampdu *tap = arg;
2229 struct ieee80211_node *ni = tap->txa_ni;
2230 struct ieee80211com *ic = ni->ni_ic;
2231
2232 /* XXX ? */
2233 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
2234 tap->txa_attempts++;
2235 ic->ic_addba_response_timeout(ni, tap);
2236 }
2237
2238 static void
addba_start_timeout(struct ieee80211_tx_ampdu * tap)2239 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
2240 {
2241 /* XXX use CALLOUT_PENDING instead? */
2242 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
2243 addba_timeout, tap);
2244 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
2245 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
2246 }
2247
2248 static void
addba_stop_timeout(struct ieee80211_tx_ampdu * tap)2249 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
2250 {
2251 /* XXX use CALLOUT_PENDING instead? */
2252 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
2253 callout_stop(&tap->txa_timer);
2254 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
2255 }
2256 }
2257
2258 static void
null_addba_response_timeout(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2259 null_addba_response_timeout(struct ieee80211_node *ni,
2260 struct ieee80211_tx_ampdu *tap)
2261 {
2262 }
2263
2264 /*
2265 * Default method for requesting A-MPDU tx aggregation.
2266 * We setup the specified state block and start a timer
2267 * to wait for an ADDBA response frame.
2268 */
2269 static int
ieee80211_addba_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int dialogtoken,int baparamset,int batimeout)2270 ieee80211_addba_request(struct ieee80211_node *ni,
2271 struct ieee80211_tx_ampdu *tap,
2272 int dialogtoken, int baparamset, int batimeout)
2273 {
2274 int bufsiz;
2275
2276 /* XXX locking */
2277 tap->txa_token = dialogtoken;
2278 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
2279 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2280 tap->txa_wnd = (bufsiz == 0) ?
2281 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
2282 addba_start_timeout(tap);
2283 return 1;
2284 }
2285
2286 /*
2287 * Called by drivers that wish to request an ADDBA session be
2288 * setup. This brings it up and starts the request timer.
2289 */
2290 int
ieee80211_ampdu_tx_request_ext(struct ieee80211_node * ni,int tid)2291 ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid)
2292 {
2293 struct ieee80211_tx_ampdu *tap;
2294
2295 if (tid < 0 || tid > 15)
2296 return (0);
2297 tap = &ni->ni_tx_ampdu[tid];
2298
2299 /* XXX locking */
2300 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2301 /* do deferred setup of state */
2302 ampdu_tx_setup(tap);
2303 }
2304 /* XXX hack for not doing proper locking */
2305 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2306 addba_start_timeout(tap);
2307 return (1);
2308 }
2309
2310 /*
2311 * Called by drivers that have marked a session as active.
2312 */
2313 int
ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node * ni,int tid,int status)2314 ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni, int tid,
2315 int status)
2316 {
2317 struct ieee80211_tx_ampdu *tap;
2318
2319 if (tid < 0 || tid > 15)
2320 return (0);
2321 tap = &ni->ni_tx_ampdu[tid];
2322
2323 /* XXX locking */
2324 addba_stop_timeout(tap);
2325 if (status == 1) {
2326 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
2327 tap->txa_attempts = 0;
2328 } else {
2329 /* mark tid so we don't try again */
2330 tap->txa_flags |= IEEE80211_AGGR_NAK;
2331 }
2332 return (1);
2333 }
2334
2335 /*
2336 * Default method for processing an A-MPDU tx aggregation
2337 * response. We shutdown any pending timer and update the
2338 * state block according to the reply.
2339 */
2340 static int
ieee80211_addba_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status,int baparamset,int batimeout)2341 ieee80211_addba_response(struct ieee80211_node *ni,
2342 struct ieee80211_tx_ampdu *tap,
2343 int status, int baparamset, int batimeout)
2344 {
2345 struct ieee80211vap *vap = ni->ni_vap;
2346 int bufsiz;
2347
2348 /* XXX locking */
2349 addba_stop_timeout(tap);
2350 if (status == IEEE80211_STATUS_SUCCESS) {
2351 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2352 /* XXX override our request? */
2353 tap->txa_wnd = (bufsiz == 0) ?
2354 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
2355 #ifdef __notyet__
2356 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2357 #endif
2358 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
2359 tap->txa_attempts = 0;
2360 /* TODO: this should be a vap flag */
2361 if ((vap->iv_htcaps & IEEE80211_HTC_TX_AMSDU_AMPDU) &&
2362 (ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
2363 (_IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU)))
2364 tap->txa_flags |= IEEE80211_AGGR_AMSDU;
2365 else
2366 tap->txa_flags &= ~IEEE80211_AGGR_AMSDU;
2367 } else {
2368 /* mark tid so we don't try again */
2369 tap->txa_flags |= IEEE80211_AGGR_NAK;
2370 }
2371 return 1;
2372 }
2373
2374 /*
2375 * Default method for stopping A-MPDU tx aggregation.
2376 * Any timer is cleared and we drain any pending frames.
2377 */
2378 static void
ieee80211_addba_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2379 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
2380 {
2381 /* XXX locking */
2382 addba_stop_timeout(tap);
2383 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
2384 /* XXX clear aggregation queue */
2385 tap->txa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_AMSDU);
2386 }
2387 tap->txa_attempts = 0;
2388 }
2389
2390 /*
2391 * Process a received action frame using the default aggregation
2392 * policy. We intercept ADDBA-related frames and use them to
2393 * update our aggregation state. All other frames are passed up
2394 * for processing by ieee80211_recv_action.
2395 */
2396 static int
ht_recv_action_ba_addba_request(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2397 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
2398 const struct ieee80211_frame *wh,
2399 const uint8_t *frm, const uint8_t *efrm)
2400 {
2401 struct ieee80211com *ic = ni->ni_ic;
2402 struct ieee80211vap *vap = ni->ni_vap;
2403 struct ieee80211_rx_ampdu *rap;
2404 uint8_t dialogtoken;
2405 uint16_t baparamset, batimeout, baseqctl;
2406 uint16_t args[5];
2407 int tid;
2408
2409 dialogtoken = frm[2];
2410 baparamset = le16dec(frm+3);
2411 batimeout = le16dec(frm+5);
2412 baseqctl = le16dec(frm+7);
2413
2414 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2415
2416 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2417 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
2418 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d amsdu %d",
2419 dialogtoken, baparamset,
2420 tid, _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ),
2421 batimeout,
2422 _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_START),
2423 _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_FRAG),
2424 _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU));
2425
2426 rap = &ni->ni_rx_ampdu[tid];
2427
2428 /* Send ADDBA response */
2429 args[0] = dialogtoken;
2430 /*
2431 * NB: We ack only if the sta associated with HT and
2432 * the ap is configured to do AMPDU rx (the latter
2433 * violates the 11n spec and is mostly for testing).
2434 */
2435 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
2436 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
2437 /* XXX TODO: handle ampdu_rx_start failure */
2438 ic->ic_ampdu_rx_start(ni, rap,
2439 baparamset, batimeout, baseqctl);
2440
2441 args[1] = IEEE80211_STATUS_SUCCESS;
2442 } else {
2443 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2444 ni, "reject ADDBA request: %s",
2445 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
2446 "administratively disabled" :
2447 "not negotiated for station");
2448 vap->iv_stats.is_addba_reject++;
2449 args[1] = IEEE80211_STATUS_UNSPECIFIED;
2450 }
2451 /* XXX honor rap flags? */
2452 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2453 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAPS_TID)
2454 | _IEEE80211_SHIFTMASK(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
2455 ;
2456
2457 /*
2458 * TODO: we're out of iv_flags_ht fields; once
2459 * this is extended we should make this configurable.
2460 */
2461 if ((baparamset & IEEE80211_BAPS_AMSDU) &&
2462 (ni->ni_flags & IEEE80211_NODE_AMSDU_RX) &&
2463 (vap->iv_htcaps & IEEE80211_HTC_RX_AMSDU_AMPDU))
2464 args[2] |= IEEE80211_BAPS_AMSDU;
2465
2466 args[3] = 0;
2467 args[4] = 0;
2468 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2469 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
2470 return 0;
2471 }
2472
2473 static int
ht_recv_action_ba_addba_response(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2474 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
2475 const struct ieee80211_frame *wh,
2476 const uint8_t *frm, const uint8_t *efrm)
2477 {
2478 struct ieee80211com *ic = ni->ni_ic;
2479 struct ieee80211vap *vap = ni->ni_vap;
2480 struct ieee80211_tx_ampdu *tap;
2481 uint8_t dialogtoken, policy;
2482 uint16_t baparamset, batimeout, code;
2483 int tid;
2484 #ifdef IEEE80211_DEBUG
2485 int amsdu, bufsiz;
2486 #endif
2487
2488 dialogtoken = frm[2];
2489 code = le16dec(frm+3);
2490 baparamset = le16dec(frm+5);
2491 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2492 #ifdef IEEE80211_DEBUG
2493 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2494 amsdu = !! _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU);
2495 #endif
2496 policy = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_POLICY);
2497 batimeout = le16dec(frm+7);
2498
2499 tap = &ni->ni_tx_ampdu[tid];
2500 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
2501 IEEE80211_DISCARD_MAC(vap,
2502 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2503 ni->ni_macaddr, "ADDBA response",
2504 "no pending ADDBA, tid %d dialogtoken %u "
2505 "code %d", tid, dialogtoken, code);
2506 vap->iv_stats.is_addba_norequest++;
2507 return 0;
2508 }
2509 if (dialogtoken != tap->txa_token) {
2510 IEEE80211_DISCARD_MAC(vap,
2511 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2512 ni->ni_macaddr, "ADDBA response",
2513 "dialogtoken mismatch: waiting for %d, "
2514 "received %d, tid %d code %d",
2515 tap->txa_token, dialogtoken, tid, code);
2516 vap->iv_stats.is_addba_badtoken++;
2517 return 0;
2518 }
2519 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
2520 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
2521 IEEE80211_DISCARD_MAC(vap,
2522 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2523 ni->ni_macaddr, "ADDBA response",
2524 "policy mismatch: expecting %s, "
2525 "received %s, tid %d code %d",
2526 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
2527 policy, tid, code);
2528 vap->iv_stats.is_addba_badpolicy++;
2529 return 0;
2530 }
2531 #if 0
2532 /* XXX we take MIN in ieee80211_addba_response */
2533 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
2534 IEEE80211_DISCARD_MAC(vap,
2535 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2536 ni->ni_macaddr, "ADDBA response",
2537 "BA window too large: max %d, "
2538 "received %d, tid %d code %d",
2539 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
2540 vap->iv_stats.is_addba_badbawinsize++;
2541 return 0;
2542 }
2543 #endif
2544
2545 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2546 "recv ADDBA response: dialogtoken %u code %d "
2547 "baparamset 0x%x (tid %d bufsiz %d amsdu %d) batimeout %d",
2548 dialogtoken, code, baparamset, tid,
2549 bufsiz,
2550 amsdu,
2551 batimeout);
2552 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
2553 return 0;
2554 }
2555
2556 static int
ht_recv_action_ba_delba(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2557 ht_recv_action_ba_delba(struct ieee80211_node *ni,
2558 const struct ieee80211_frame *wh,
2559 const uint8_t *frm, const uint8_t *efrm)
2560 {
2561 struct ieee80211com *ic = ni->ni_ic;
2562 struct ieee80211_rx_ampdu *rap;
2563 struct ieee80211_tx_ampdu *tap;
2564 uint16_t baparamset;
2565 #ifdef IEEE80211_DEBUG
2566 uint16_t code;
2567 #endif
2568 int tid;
2569
2570 baparamset = le16dec(frm+2);
2571 #ifdef IEEE80211_DEBUG
2572 code = le16dec(frm+4);
2573 #endif
2574
2575 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_DELBAPS_TID);
2576
2577 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2578 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
2579 "code %d", baparamset, tid,
2580 _IEEE80211_MASKSHIFT(baparamset, IEEE80211_DELBAPS_INIT), code);
2581
2582 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
2583 tap = &ni->ni_tx_ampdu[tid];
2584 ic->ic_addba_stop(ni, tap);
2585 } else {
2586 rap = &ni->ni_rx_ampdu[tid];
2587 ic->ic_ampdu_rx_stop(ni, rap);
2588 }
2589 return 0;
2590 }
2591
2592 static int
ht_recv_action_ht_txchwidth(struct ieee80211_node * ni,const struct ieee80211_frame * wh __unused,const uint8_t * frm,const uint8_t * efrm __unused)2593 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
2594 const struct ieee80211_frame *wh __unused,
2595 const uint8_t *frm, const uint8_t *efrm __unused)
2596 {
2597 int chw;
2598
2599 /* If 20/40 is not supported the chw cannot change. */
2600 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) == 0)
2601 return (0);
2602
2603 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ?
2604 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
2605
2606 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2607 "%s: HT txchwidth, width %d%s (%s)", __func__,
2608 chw, ni->ni_chw != chw ? "*" : "", ieee80211_ni_chw_to_str(chw));
2609 if (chw != ni->ni_chw) {
2610 /* XXX does this need to change the ht40 station count? */
2611 ni->ni_chw = chw;
2612 /* XXX notify on change */
2613 }
2614 return 0;
2615 }
2616
2617 static int
ht_recv_action_ht_mimopwrsave(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2618 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2619 const struct ieee80211_frame *wh,
2620 const uint8_t *frm, const uint8_t *efrm)
2621 {
2622 const struct ieee80211_action_ht_mimopowersave *mps =
2623 (const struct ieee80211_action_ht_mimopowersave *) frm;
2624
2625 /* XXX check iv_htcaps */
2626 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2627 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2628 else
2629 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2630 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2631 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2632 else
2633 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2634 /* XXX notify on change */
2635 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2636 "%s: HT MIMO PS (%s%s)", __func__,
2637 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2638 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2639 );
2640 return 0;
2641 }
2642
2643 /*
2644 * Transmit processing.
2645 */
2646
2647 /*
2648 * Check if A-MPDU should be requested/enabled for a stream.
2649 * We require a traffic rate above a per-AC threshold and we
2650 * also handle backoff from previous failed attempts.
2651 *
2652 * Drivers may override this method to bring in information
2653 * such as link state conditions in making the decision.
2654 */
2655 static int
ieee80211_ampdu_enable(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2656 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2657 struct ieee80211_tx_ampdu *tap)
2658 {
2659 struct ieee80211vap *vap = ni->ni_vap;
2660
2661 if (tap->txa_avgpps <
2662 vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
2663 return 0;
2664 /* XXX check rssi? */
2665 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2666 ieee80211_time_after(ticks, tap->txa_nextrequest)) {
2667 /*
2668 * Don't retry too often; txa_nextrequest is set
2669 * to the minimum interval we'll retry after
2670 * ieee80211_addba_maxtries failed attempts are made.
2671 */
2672 return 0;
2673 }
2674 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2675 "enable AMPDU on tid %d (%s), avgpps %d pkts %d attempt %d",
2676 tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
2677 tap->txa_avgpps, tap->txa_pkts, tap->txa_attempts);
2678 return 1;
2679 }
2680
2681 /*
2682 * Request A-MPDU tx aggregation. Setup local state and
2683 * issue an ADDBA request. BA use will only happen after
2684 * the other end replies with ADDBA response.
2685 */
2686 int
ieee80211_ampdu_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2687 ieee80211_ampdu_request(struct ieee80211_node *ni,
2688 struct ieee80211_tx_ampdu *tap)
2689 {
2690 struct ieee80211com *ic = ni->ni_ic;
2691 uint16_t args[5];
2692 int tid, dialogtoken;
2693 static int tokens = 0; /* XXX */
2694
2695 /* XXX locking */
2696 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2697 /* do deferred setup of state */
2698 ampdu_tx_setup(tap);
2699 }
2700 /* XXX hack for not doing proper locking */
2701 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2702
2703 dialogtoken = (tokens+1) % 63; /* XXX */
2704 tid = tap->txa_tid;
2705
2706 /*
2707 * XXX TODO: This is racy with any other parallel TX going on. :(
2708 */
2709 tap->txa_start = ni->ni_txseqs[tid];
2710
2711 args[0] = dialogtoken;
2712 args[1] = 0; /* NB: status code not used */
2713 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2714 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAPS_TID)
2715 | _IEEE80211_SHIFTMASK(IEEE80211_AGGR_BAWMAX,
2716 IEEE80211_BAPS_BUFSIZ)
2717 ;
2718
2719 /* XXX TODO: this should be a flag, not iv_htcaps */
2720 if ((ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
2721 (ni->ni_vap->iv_htcaps & IEEE80211_HTC_TX_AMSDU_AMPDU))
2722 args[2] |= IEEE80211_BAPS_AMSDU;
2723
2724 args[3] = 0; /* batimeout */
2725 /* NB: do first so there's no race against reply */
2726 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2727 /* unable to setup state, don't make request */
2728 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2729 ni, "%s: could not setup BA stream for TID %d AC %d",
2730 __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
2731 /* defer next try so we don't slam the driver with requests */
2732 tap->txa_attempts = ieee80211_addba_maxtries;
2733 /* NB: check in case driver wants to override */
2734 if (tap->txa_nextrequest <= ticks)
2735 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2736 return 0;
2737 }
2738 tokens = dialogtoken; /* allocate token */
2739 /* NB: after calling ic_addba_request so driver can set txa_start */
2740 args[4] = _IEEE80211_SHIFTMASK(tap->txa_start, IEEE80211_BASEQ_START)
2741 | _IEEE80211_SHIFTMASK(0, IEEE80211_BASEQ_FRAG)
2742 ;
2743 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2744 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2745 }
2746
2747 /*
2748 * Terminate an AMPDU tx stream. State is reclaimed
2749 * and the peer notified with a DelBA Action frame.
2750 */
2751 void
ieee80211_ampdu_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int reason)2752 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2753 int reason)
2754 {
2755 struct ieee80211com *ic = ni->ni_ic;
2756 struct ieee80211vap *vap = ni->ni_vap;
2757 uint16_t args[4];
2758
2759 /* XXX locking */
2760 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2761 if (IEEE80211_AMPDU_RUNNING(tap)) {
2762 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2763 ni, "%s: stop BA stream for TID %d (reason: %d (%s))",
2764 __func__, tap->txa_tid, reason,
2765 ieee80211_reason_to_string(reason));
2766 vap->iv_stats.is_ampdu_stop++;
2767
2768 ic->ic_addba_stop(ni, tap);
2769 args[0] = tap->txa_tid;
2770 args[1] = IEEE80211_DELBAPS_INIT;
2771 args[2] = reason; /* XXX reason code */
2772 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2773 IEEE80211_ACTION_BA_DELBA, args);
2774 } else {
2775 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2776 ni, "%s: BA stream for TID %d not running "
2777 "(reason: %d (%s))", __func__, tap->txa_tid, reason,
2778 ieee80211_reason_to_string(reason));
2779 vap->iv_stats.is_ampdu_stop_failed++;
2780 }
2781 }
2782
2783 /* XXX */
2784 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
2785
2786 static void
bar_timeout(void * arg)2787 bar_timeout(void *arg)
2788 {
2789 struct ieee80211_tx_ampdu *tap = arg;
2790 struct ieee80211_node *ni = tap->txa_ni;
2791
2792 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2793 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2794
2795 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2796 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2797 tap->txa_tid, tap->txa_flags, tap->txa_attempts);
2798
2799 /* guard against race with bar_tx_complete */
2800 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2801 return;
2802 /* XXX ? */
2803 if (tap->txa_attempts >= ieee80211_bar_maxtries) {
2804 struct ieee80211com *ic = ni->ni_ic;
2805
2806 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
2807 /*
2808 * If (at least) the last BAR TX timeout was due to
2809 * an ieee80211_send_bar() failures, then we need
2810 * to make sure we notify the driver that a BAR
2811 * TX did occur and fail. This gives the driver
2812 * a chance to undo any queue pause that may
2813 * have occurred.
2814 */
2815 ic->ic_bar_response(ni, tap, 1);
2816 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2817 } else {
2818 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
2819 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
2820 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2821 ni, "%s: failed to TX, starting timer\n",
2822 __func__);
2823 /*
2824 * If ieee80211_send_bar() fails here, the
2825 * timer may have stopped and/or the pending
2826 * flag may be clear. Because of this,
2827 * fake the BARPEND and reset the timer.
2828 * A retransmission attempt will then occur
2829 * during the next timeout.
2830 */
2831 /* XXX locking */
2832 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2833 bar_start_timer(tap);
2834 }
2835 }
2836 }
2837
2838 static void
bar_start_timer(struct ieee80211_tx_ampdu * tap)2839 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2840 {
2841 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2842 tap->txa_ni,
2843 "%s: called",
2844 __func__);
2845 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2846 }
2847
2848 static void
bar_stop_timer(struct ieee80211_tx_ampdu * tap)2849 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2850 {
2851 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2852 tap->txa_ni,
2853 "%s: called",
2854 __func__);
2855 callout_stop(&tap->txa_timer);
2856 }
2857
2858 static void
bar_tx_complete(struct ieee80211_node * ni,void * arg,int status)2859 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2860 {
2861 struct ieee80211_tx_ampdu *tap = arg;
2862
2863 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2864 ni, "%s: tid %u flags 0x%x pending %d status %d",
2865 __func__, tap->txa_tid, tap->txa_flags,
2866 callout_pending(&tap->txa_timer), status);
2867
2868 ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
2869 /* XXX locking */
2870 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2871 callout_pending(&tap->txa_timer)) {
2872 struct ieee80211com *ic = ni->ni_ic;
2873
2874 if (status == 0) /* ACK'd */
2875 bar_stop_timer(tap);
2876 ic->ic_bar_response(ni, tap, status);
2877 /* NB: just let timer expire so we pace requests */
2878 }
2879 }
2880
2881 static void
ieee80211_bar_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status)2882 ieee80211_bar_response(struct ieee80211_node *ni,
2883 struct ieee80211_tx_ampdu *tap, int status)
2884 {
2885
2886 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2887 tap->txa_ni,
2888 "%s: called",
2889 __func__);
2890 if (status == 0) { /* got ACK */
2891 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2892 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2893 tap->txa_start,
2894 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2895 tap->txa_qframes, tap->txa_seqpending,
2896 tap->txa_tid);
2897
2898 /* NB: timer already stopped in bar_tx_complete */
2899 tap->txa_start = tap->txa_seqpending;
2900 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2901 }
2902 }
2903
2904 /*
2905 * Transmit a BAR frame to the specified node. The
2906 * BAR contents are drawn from the supplied aggregation
2907 * state associated with the node.
2908 *
2909 * NB: we only handle immediate ACK w/ compressed bitmap.
2910 */
2911 int
ieee80211_send_bar(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,ieee80211_seq seq)2912 ieee80211_send_bar(struct ieee80211_node *ni,
2913 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2914 {
2915 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2916 struct ieee80211vap *vap = ni->ni_vap;
2917 struct ieee80211com *ic = ni->ni_ic;
2918 struct ieee80211_frame_bar *bar;
2919 struct mbuf *m;
2920 uint16_t barctl, barseqctl;
2921 uint8_t *frm;
2922 int tid, ret;
2923
2924 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2925 tap->txa_ni,
2926 "%s: called",
2927 __func__);
2928
2929 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2930 /* no ADDBA response, should not happen */
2931 /* XXX stat+msg */
2932 return EINVAL;
2933 }
2934 /* XXX locking */
2935 bar_stop_timer(tap);
2936
2937 ieee80211_ref_node(ni);
2938
2939 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2940 if (m == NULL)
2941 senderr(ENOMEM, is_tx_nobuf);
2942
2943 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2944 m_freem(m);
2945 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2946 /* NOTREACHED */
2947 }
2948
2949 bar = mtod(m, struct ieee80211_frame_bar *);
2950 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2951 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2952 bar->i_fc[1] = 0;
2953 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2954 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2955
2956 tid = tap->txa_tid;
2957 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2958 0 : IEEE80211_BAR_NOACK)
2959 | IEEE80211_BAR_COMP
2960 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAR_TID)
2961 ;
2962 barseqctl = _IEEE80211_SHIFTMASK(seq, IEEE80211_BAR_SEQ_START);
2963 /* NB: known to have proper alignment */
2964 bar->i_ctl = htole16(barctl);
2965 bar->i_seq = htole16(barseqctl);
2966 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2967
2968 M_WME_SETAC(m, WME_AC_VO);
2969
2970 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2971
2972 /* XXX locking */
2973 /* init/bump attempts counter */
2974 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2975 tap->txa_attempts = 1;
2976 else
2977 tap->txa_attempts++;
2978 tap->txa_seqpending = seq;
2979 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2980
2981 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2982 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2983 tid, barctl, seq, tap->txa_attempts);
2984
2985 /*
2986 * ic_raw_xmit will free the node reference
2987 * regardless of queue/TX success or failure.
2988 */
2989 IEEE80211_TX_LOCK(ic);
2990 ret = ieee80211_raw_output(vap, ni, m, NULL);
2991 IEEE80211_TX_UNLOCK(ic);
2992 if (ret != 0) {
2993 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2994 ni, "send BAR: failed: (ret = %d)\n",
2995 ret);
2996 /* xmit failed, clear state flag */
2997 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2998 vap->iv_stats.is_ampdu_bar_tx_fail++;
2999 return ret;
3000 }
3001 /* XXX hack against tx complete happening before timer is started */
3002 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
3003 bar_start_timer(tap);
3004 return 0;
3005 bad:
3006 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
3007 tap->txa_ni,
3008 "%s: bad! ret=%d",
3009 __func__, ret);
3010 vap->iv_stats.is_ampdu_bar_tx_fail++;
3011 ieee80211_free_node(ni);
3012 return ret;
3013 #undef senderr
3014 }
3015
3016 static int
ht_action_output(struct ieee80211_node * ni,struct mbuf * m)3017 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
3018 {
3019 struct ieee80211_bpf_params params;
3020
3021 memset(¶ms, 0, sizeof(params));
3022 params.ibp_pri = WME_AC_VO;
3023 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
3024 /* NB: we know all frames are unicast */
3025 params.ibp_try0 = ni->ni_txparms->maxretry;
3026 params.ibp_power = ni->ni_txpower;
3027 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
3028 ¶ms);
3029 }
3030
3031 #define ADDSHORT(frm, v) do { \
3032 frm[0] = (v) & 0xff; \
3033 frm[1] = (v) >> 8; \
3034 frm += 2; \
3035 } while (0)
3036
3037 /*
3038 * Send an action management frame. The arguments are stuff
3039 * into a frame without inspection; the caller is assumed to
3040 * prepare them carefully (e.g. based on the aggregation state).
3041 */
3042 static int
ht_send_action_ba_addba(struct ieee80211_node * ni,int category,int action,void * arg0)3043 ht_send_action_ba_addba(struct ieee80211_node *ni,
3044 int category, int action, void *arg0)
3045 {
3046 struct ieee80211vap *vap = ni->ni_vap;
3047 struct ieee80211com *ic = ni->ni_ic;
3048 uint16_t *args = arg0;
3049 struct mbuf *m;
3050 uint8_t *frm;
3051
3052 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3053 "send ADDBA %s: dialogtoken %d status %d "
3054 "baparamset 0x%x (tid %d amsdu %d) batimeout 0x%x baseqctl 0x%x",
3055 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
3056 "request" : "response", args[0], args[1], args[2],
3057 _IEEE80211_MASKSHIFT(args[2], IEEE80211_BAPS_TID),
3058 _IEEE80211_MASKSHIFT(args[2], IEEE80211_BAPS_AMSDU),
3059 args[3], args[4]);
3060
3061 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3062 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3063 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3064 ieee80211_ref_node(ni);
3065
3066 m = ieee80211_getmgtframe(&frm,
3067 ic->ic_headroom + sizeof(struct ieee80211_frame),
3068 sizeof(uint16_t) /* action+category */
3069 /* XXX may action payload */
3070 + sizeof(struct ieee80211_action_ba_addbaresponse)
3071 );
3072 if (m != NULL) {
3073 *frm++ = category;
3074 *frm++ = action;
3075 *frm++ = args[0]; /* dialog token */
3076 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
3077 ADDSHORT(frm, args[1]); /* status code */
3078 ADDSHORT(frm, args[2]); /* baparamset */
3079 ADDSHORT(frm, args[3]); /* batimeout */
3080 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
3081 ADDSHORT(frm, args[4]); /* baseqctl */
3082 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3083 return ht_action_output(ni, m);
3084 } else {
3085 vap->iv_stats.is_tx_nobuf++;
3086 ieee80211_free_node(ni);
3087 return ENOMEM;
3088 }
3089 }
3090
3091 static int
ht_send_action_ba_delba(struct ieee80211_node * ni,int category,int action,void * arg0)3092 ht_send_action_ba_delba(struct ieee80211_node *ni,
3093 int category, int action, void *arg0)
3094 {
3095 struct ieee80211vap *vap = ni->ni_vap;
3096 struct ieee80211com *ic = ni->ni_ic;
3097 uint16_t *args = arg0;
3098 struct mbuf *m;
3099 uint16_t baparamset;
3100 uint8_t *frm;
3101
3102 baparamset = _IEEE80211_SHIFTMASK(args[0], IEEE80211_DELBAPS_TID)
3103 | args[1]
3104 ;
3105 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3106 "send DELBA action: tid %d, initiator %d reason %d (%s)",
3107 args[0], args[1], args[2], ieee80211_reason_to_string(args[2]));
3108
3109 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3110 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3111 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3112 ieee80211_ref_node(ni);
3113
3114 m = ieee80211_getmgtframe(&frm,
3115 ic->ic_headroom + sizeof(struct ieee80211_frame),
3116 sizeof(uint16_t) /* action+category */
3117 /* XXX may action payload */
3118 + sizeof(struct ieee80211_action_ba_addbaresponse)
3119 );
3120 if (m != NULL) {
3121 *frm++ = category;
3122 *frm++ = action;
3123 ADDSHORT(frm, baparamset);
3124 ADDSHORT(frm, args[2]); /* reason code */
3125 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3126 return ht_action_output(ni, m);
3127 } else {
3128 vap->iv_stats.is_tx_nobuf++;
3129 ieee80211_free_node(ni);
3130 return ENOMEM;
3131 }
3132 }
3133
3134 static int
ht_send_action_ht_txchwidth(struct ieee80211_node * ni,int category,int action,void * arg0)3135 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
3136 int category, int action, void *arg0)
3137 {
3138 struct ieee80211vap *vap = ni->ni_vap;
3139 struct ieee80211com *ic = ni->ni_ic;
3140 struct mbuf *m;
3141 uint8_t *frm;
3142
3143 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3144 "send HT txchwidth: width %d",
3145 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
3146
3147 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3148 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3149 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3150 ieee80211_ref_node(ni);
3151
3152 m = ieee80211_getmgtframe(&frm,
3153 ic->ic_headroom + sizeof(struct ieee80211_frame),
3154 sizeof(uint16_t) /* action+category */
3155 /* XXX may action payload */
3156 + sizeof(struct ieee80211_action_ba_addbaresponse)
3157 );
3158 if (m != NULL) {
3159 *frm++ = category;
3160 *frm++ = action;
3161 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
3162 IEEE80211_A_HT_TXCHWIDTH_2040 :
3163 IEEE80211_A_HT_TXCHWIDTH_20;
3164 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3165 return ht_action_output(ni, m);
3166 } else {
3167 vap->iv_stats.is_tx_nobuf++;
3168 ieee80211_free_node(ni);
3169 return ENOMEM;
3170 }
3171 }
3172 #undef ADDSHORT
3173
3174 /*
3175 * Construct the MCS bit mask for inclusion in an HT capabilities
3176 * information element.
3177 */
3178 static void
ieee80211_set_mcsset(struct ieee80211com * ic,uint8_t * frm)3179 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
3180 {
3181 int i;
3182 uint8_t txparams;
3183
3184 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
3185 ("ic_rxstream %d out of range", ic->ic_rxstream));
3186 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
3187 ("ic_txstream %d out of range", ic->ic_txstream));
3188
3189 for (i = 0; i < ic->ic_rxstream * 8; i++)
3190 setbit(frm, i);
3191 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
3192 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
3193 setbit(frm, 32);
3194 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
3195 if (ic->ic_rxstream >= 2) {
3196 for (i = 33; i <= 38; i++)
3197 setbit(frm, i);
3198 }
3199 if (ic->ic_rxstream >= 3) {
3200 for (i = 39; i <= 52; i++)
3201 setbit(frm, i);
3202 }
3203 if (ic->ic_rxstream >= 4) {
3204 for (i = 53; i <= 76; i++)
3205 setbit(frm, i);
3206 }
3207 }
3208
3209 txparams = 0x1; /* TX MCS set defined */
3210 if (ic->ic_rxstream != ic->ic_txstream) {
3211 txparams |= 0x2; /* TX RX MCS not equal */
3212 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
3213 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
3214 txparams |= 0x16; /* TX unequal modulation sup */
3215 }
3216
3217 frm[12] = txparams;
3218 }
3219
3220 /*
3221 * Add body of an HTCAP information element.
3222 */
3223 static uint8_t *
ieee80211_add_htcap_body(uint8_t * frm,struct ieee80211_node * ni)3224 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
3225 {
3226 #define ADDSHORT(frm, v) do { \
3227 frm[0] = (v) & 0xff; \
3228 frm[1] = (v) >> 8; \
3229 frm += 2; \
3230 } while (0)
3231 struct ieee80211com *ic = ni->ni_ic;
3232 struct ieee80211vap *vap = ni->ni_vap;
3233 uint16_t caps, extcaps;
3234 int rxmax, density;
3235
3236 /* HT capabilities */
3237 caps = vap->iv_htcaps & 0xffff;
3238 /*
3239 * Note channel width depends on whether we are operating as
3240 * a sta or not. When operating as a sta we are generating
3241 * a request based on our desired configuration. Otherwise
3242 * we are operational and the channel attributes identify
3243 * how we've been setup (which might be different if a fixed
3244 * channel is specified).
3245 */
3246 if (vap->iv_opmode == IEEE80211_M_STA) {
3247 /* override 20/40 use based on config */
3248 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
3249 caps |= IEEE80211_HTCAP_CHWIDTH40;
3250 else
3251 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3252
3253 /* Start by using the advertised settings */
3254 rxmax = _IEEE80211_MASKSHIFT(ni->ni_htparam,
3255 IEEE80211_HTCAP_MAXRXAMPDU);
3256 density = _IEEE80211_MASKSHIFT(ni->ni_htparam,
3257 IEEE80211_HTCAP_MPDUDENSITY);
3258
3259 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
3260 "%s: advertised rxmax=%d, density=%d, vap rxmax=%d, density=%d\n",
3261 __func__,
3262 rxmax,
3263 density,
3264 vap->iv_ampdu_rxmax,
3265 vap->iv_ampdu_density);
3266
3267 /* Cap at VAP rxmax */
3268 if (rxmax > vap->iv_ampdu_rxmax)
3269 rxmax = vap->iv_ampdu_rxmax;
3270
3271 /*
3272 * If the VAP ampdu density value greater, use that.
3273 *
3274 * (Larger density value == larger minimum gap between A-MPDU
3275 * subframes.)
3276 */
3277 if (vap->iv_ampdu_density > density)
3278 density = vap->iv_ampdu_density;
3279
3280 /*
3281 * NB: Hardware might support HT40 on some but not all
3282 * channels. We can't determine this earlier because only
3283 * after association the channel is upgraded to HT based
3284 * on the negotiated capabilities.
3285 */
3286 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
3287 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
3288 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
3289 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3290 } else {
3291 /* override 20/40 use based on current channel */
3292 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
3293 caps |= IEEE80211_HTCAP_CHWIDTH40;
3294 else
3295 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3296
3297 /* XXX TODO should it start by using advertised settings? */
3298 rxmax = vap->iv_ampdu_rxmax;
3299 density = vap->iv_ampdu_density;
3300 }
3301
3302 /* adjust short GI based on channel and config */
3303 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
3304 caps &= ~IEEE80211_HTCAP_SHORTGI20;
3305 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
3306 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
3307 caps &= ~IEEE80211_HTCAP_SHORTGI40;
3308
3309 /* adjust STBC based on receive capabilities */
3310 if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
3311 caps &= ~IEEE80211_HTCAP_RXSTBC;
3312
3313 /* adjust LDPC based on receive capabilites */
3314 if ((vap->iv_flags_ht & IEEE80211_FHT_LDPC_RX) == 0)
3315 caps &= ~IEEE80211_HTCAP_LDPC;
3316
3317 ADDSHORT(frm, caps);
3318
3319 /* HT parameters */
3320 *frm = _IEEE80211_SHIFTMASK(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
3321 | _IEEE80211_SHIFTMASK(density, IEEE80211_HTCAP_MPDUDENSITY)
3322 ;
3323 frm++;
3324
3325 /* pre-zero remainder of ie */
3326 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
3327 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
3328
3329 /* supported MCS set */
3330 /*
3331 * XXX: For sta mode the rate set should be restricted based
3332 * on the AP's capabilities, but ni_htrates isn't setup when
3333 * we're called to form an AssocReq frame so for now we're
3334 * restricted to the device capabilities.
3335 */
3336 ieee80211_set_mcsset(ni->ni_ic, frm);
3337
3338 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
3339 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
3340
3341 /* HT extended capabilities */
3342 extcaps = vap->iv_htextcaps & 0xffff;
3343
3344 ADDSHORT(frm, extcaps);
3345
3346 frm += sizeof(struct ieee80211_ie_htcap) -
3347 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
3348
3349 return frm;
3350 #undef ADDSHORT
3351 }
3352
3353 /*
3354 * Add 802.11n HT capabilities information element
3355 */
3356 uint8_t *
ieee80211_add_htcap(uint8_t * frm,struct ieee80211_node * ni)3357 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
3358 {
3359 frm[0] = IEEE80211_ELEMID_HTCAP;
3360 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
3361 return ieee80211_add_htcap_body(frm + 2, ni);
3362 }
3363
3364 /*
3365 * Non-associated probe request - add HT capabilities based on
3366 * the current channel configuration.
3367 */
3368 static uint8_t *
ieee80211_add_htcap_body_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)3369 ieee80211_add_htcap_body_ch(uint8_t *frm, struct ieee80211vap *vap,
3370 struct ieee80211_channel *c)
3371 {
3372 #define ADDSHORT(frm, v) do { \
3373 frm[0] = (v) & 0xff; \
3374 frm[1] = (v) >> 8; \
3375 frm += 2; \
3376 } while (0)
3377 struct ieee80211com *ic = vap->iv_ic;
3378 uint16_t caps, extcaps;
3379 int rxmax, density;
3380
3381 /* HT capabilities */
3382 caps = vap->iv_htcaps & 0xffff;
3383
3384 /*
3385 * We don't use this in STA mode; only in IBSS mode.
3386 * So in IBSS mode we base our HTCAP flags on the
3387 * given channel.
3388 */
3389
3390 /* override 20/40 use based on current channel */
3391 if (IEEE80211_IS_CHAN_HT40(c))
3392 caps |= IEEE80211_HTCAP_CHWIDTH40;
3393 else
3394 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3395
3396 /* Use the currently configured values */
3397 rxmax = vap->iv_ampdu_rxmax;
3398 density = vap->iv_ampdu_density;
3399
3400 /* adjust short GI based on channel and config */
3401 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
3402 caps &= ~IEEE80211_HTCAP_SHORTGI20;
3403 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
3404 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
3405 caps &= ~IEEE80211_HTCAP_SHORTGI40;
3406 ADDSHORT(frm, caps);
3407
3408 /* HT parameters */
3409 *frm = _IEEE80211_SHIFTMASK(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
3410 | _IEEE80211_SHIFTMASK(density, IEEE80211_HTCAP_MPDUDENSITY)
3411 ;
3412 frm++;
3413
3414 /* pre-zero remainder of ie */
3415 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
3416 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
3417
3418 /* supported MCS set */
3419 /*
3420 * XXX: For sta mode the rate set should be restricted based
3421 * on the AP's capabilities, but ni_htrates isn't setup when
3422 * we're called to form an AssocReq frame so for now we're
3423 * restricted to the device capabilities.
3424 */
3425 ieee80211_set_mcsset(ic, frm);
3426
3427 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
3428 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
3429
3430 /* HT extended capabilities */
3431 extcaps = vap->iv_htextcaps & 0xffff;
3432
3433 ADDSHORT(frm, extcaps);
3434
3435 frm += sizeof(struct ieee80211_ie_htcap) -
3436 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
3437
3438 return frm;
3439 #undef ADDSHORT
3440 }
3441
3442 /*
3443 * Add 802.11n HT capabilities information element
3444 */
3445 uint8_t *
ieee80211_add_htcap_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)3446 ieee80211_add_htcap_ch(uint8_t *frm, struct ieee80211vap *vap,
3447 struct ieee80211_channel *c)
3448 {
3449 frm[0] = IEEE80211_ELEMID_HTCAP;
3450 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
3451 return ieee80211_add_htcap_body_ch(frm + 2, vap, c);
3452 }
3453
3454 /*
3455 * Add Broadcom OUI wrapped standard HTCAP ie; this is
3456 * used for compatibility w/ pre-draft implementations.
3457 */
3458 uint8_t *
ieee80211_add_htcap_vendor(uint8_t * frm,struct ieee80211_node * ni)3459 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
3460 {
3461 frm[0] = IEEE80211_ELEMID_VENDOR;
3462 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
3463 frm[2] = (BCM_OUI >> 0) & 0xff;
3464 frm[3] = (BCM_OUI >> 8) & 0xff;
3465 frm[4] = (BCM_OUI >> 16) & 0xff;
3466 frm[5] = BCM_OUI_HTCAP;
3467 return ieee80211_add_htcap_body(frm + 6, ni);
3468 }
3469
3470 /*
3471 * Construct the MCS bit mask of basic rates
3472 * for inclusion in an HT information element.
3473 */
3474 static void
ieee80211_set_basic_htrates(uint8_t * frm,const struct ieee80211_htrateset * rs)3475 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
3476 {
3477 int i;
3478
3479 for (i = 0; i < rs->rs_nrates; i++) {
3480 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
3481 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
3482 r < IEEE80211_HTRATE_MAXSIZE) {
3483 /* NB: this assumes a particular implementation */
3484 setbit(frm, r);
3485 }
3486 }
3487 }
3488
3489 /*
3490 * Update the HTINFO ie for a beacon frame.
3491 */
3492 void
ieee80211_ht_update_beacon(struct ieee80211vap * vap,struct ieee80211_beacon_offsets * bo)3493 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
3494 struct ieee80211_beacon_offsets *bo)
3495 {
3496 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
3497 struct ieee80211_node *ni;
3498 const struct ieee80211_channel *bsschan;
3499 struct ieee80211com *ic = vap->iv_ic;
3500 struct ieee80211_ie_htinfo *ht =
3501 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
3502
3503 ni = ieee80211_ref_node(vap->iv_bss);
3504 bsschan = ni->ni_chan;
3505
3506 /* XXX only update on channel change */
3507 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
3508 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
3509 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
3510 else
3511 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
3512 if (IEEE80211_IS_CHAN_HT40U(bsschan))
3513 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
3514 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
3515 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
3516 else
3517 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
3518 if (IEEE80211_IS_CHAN_HT40(bsschan))
3519 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
3520
3521 /* protection mode */
3522 /*
3523 * XXX TODO: this uses the global flag, not the per-VAP flag.
3524 * Eventually (once the protection modes are done per-channel
3525 * rather than per-VAP) we can flip this over to be per-VAP but
3526 * using the channel protection mode.
3527 */
3528 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
3529
3530 ieee80211_free_node(ni);
3531
3532 /* XXX propagate to vendor ie's */
3533 #undef PROTMODE
3534 }
3535
3536 /*
3537 * Add body of an HTINFO information element.
3538 *
3539 * NB: We don't use struct ieee80211_ie_htinfo because we can
3540 * be called to fillin both a standard ie and a compat ie that
3541 * has a vendor OUI at the front.
3542 */
3543 static uint8_t *
ieee80211_add_htinfo_body(uint8_t * frm,struct ieee80211_node * ni)3544 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
3545 {
3546 struct ieee80211vap *vap = ni->ni_vap;
3547 struct ieee80211com *ic = ni->ni_ic;
3548
3549 /* pre-zero remainder of ie */
3550 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
3551
3552 /* primary/control channel center */
3553 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
3554
3555 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
3556 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
3557 else
3558 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
3559 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
3560 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
3561 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
3562 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
3563 else
3564 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
3565 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
3566 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
3567
3568 /*
3569 * Add current protection mode. Unlike for beacons,
3570 * this will respect the per-VAP flags.
3571 */
3572 frm[1] = vap->iv_curhtprotmode;
3573
3574 frm += 5;
3575
3576 /* basic MCS set */
3577 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
3578 frm += sizeof(struct ieee80211_ie_htinfo) -
3579 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
3580 return frm;
3581 }
3582
3583 /*
3584 * Add 802.11n HT information element.
3585 */
3586 uint8_t *
ieee80211_add_htinfo(uint8_t * frm,struct ieee80211_node * ni)3587 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
3588 {
3589 frm[0] = IEEE80211_ELEMID_HTINFO;
3590 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
3591 return ieee80211_add_htinfo_body(frm + 2, ni);
3592 }
3593
3594 /*
3595 * Add Broadcom OUI wrapped standard HTINFO ie; this is
3596 * used for compatibility w/ pre-draft implementations.
3597 */
3598 uint8_t *
ieee80211_add_htinfo_vendor(uint8_t * frm,struct ieee80211_node * ni)3599 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
3600 {
3601 frm[0] = IEEE80211_ELEMID_VENDOR;
3602 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
3603 frm[2] = (BCM_OUI >> 0) & 0xff;
3604 frm[3] = (BCM_OUI >> 8) & 0xff;
3605 frm[4] = (BCM_OUI >> 16) & 0xff;
3606 frm[5] = BCM_OUI_HTINFO;
3607 return ieee80211_add_htinfo_body(frm + 6, ni);
3608 }
3609
3610 /*
3611 * Get the HT density for the given 802.11n node.
3612 *
3613 * Take into account the density advertised from the peer.
3614 * Larger values are longer A-MPDU density spacing values, and
3615 * we want to obey them per station if we get them.
3616 */
3617 int
ieee80211_ht_get_node_ampdu_density(const struct ieee80211_node * ni)3618 ieee80211_ht_get_node_ampdu_density(const struct ieee80211_node *ni)
3619 {
3620 struct ieee80211vap *vap;
3621 int peer_mpdudensity;
3622
3623 vap = ni->ni_vap;
3624 peer_mpdudensity =
3625 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
3626 if (vap->iv_ampdu_density > peer_mpdudensity)
3627 peer_mpdudensity = vap->iv_ampdu_density;
3628 return (peer_mpdudensity);
3629 }
3630
3631 /*
3632 * Get the transmit A-MPDU limit for the given 802.11n node.
3633 *
3634 * Take into account the limit advertised from the peer.
3635 * Smaller values indicate smaller maximum A-MPDU sizes, and
3636 * should be used when forming an A-MPDU to the given peer.
3637 */
3638 int
ieee80211_ht_get_node_ampdu_limit(const struct ieee80211_node * ni)3639 ieee80211_ht_get_node_ampdu_limit(const struct ieee80211_node *ni)
3640 {
3641 struct ieee80211vap *vap;
3642 int peer_mpdulimit;
3643
3644 vap = ni->ni_vap;
3645 peer_mpdulimit =
3646 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
3647
3648 return (MIN(vap->iv_ampdu_limit, peer_mpdulimit));
3649 }
3650
3651 /*
3652 * Return true if short-GI is available when transmitting to
3653 * the given node at 20MHz.
3654 *
3655 * Ensure it's configured and available in the VAP / driver as
3656 * well as the node.
3657 */
3658 bool
ieee80211_ht_check_tx_shortgi_20(const struct ieee80211_node * ni)3659 ieee80211_ht_check_tx_shortgi_20(const struct ieee80211_node *ni)
3660 {
3661 const struct ieee80211vap *vap;
3662 const struct ieee80211com *ic;
3663
3664 if (! ieee80211_ht_check_tx_ht(ni))
3665 return (false);
3666
3667 vap = ni->ni_vap;
3668 ic = ni->ni_ic;
3669
3670 return ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) &&
3671 (ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
3672 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20));
3673 }
3674
3675 /*
3676 * Return true if short-GI is available when transmitting to
3677 * the given node at 40MHz.
3678 *
3679 * Ensure it's configured and available in the VAP / driver as
3680 * well as the node and BSS.
3681 */
3682 bool
ieee80211_ht_check_tx_shortgi_40(const struct ieee80211_node * ni)3683 ieee80211_ht_check_tx_shortgi_40(const struct ieee80211_node *ni)
3684 {
3685 const struct ieee80211vap *vap;
3686 const struct ieee80211com *ic;
3687
3688 if (! ieee80211_ht_check_tx_ht40(ni))
3689 return (false);
3690
3691 vap = ni->ni_vap;
3692 ic = ni->ni_ic;
3693
3694 return ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40) &&
3695 (ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
3696 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40));
3697 }
3698
3699 /*
3700 * Return true if HT rates can be used for the given node.
3701 *
3702 * There are some situations seen in the wild, wild past where
3703 * HT APs would announce HT but no HT rates.
3704 */
3705 bool
ieee80211_ht_check_tx_ht(const struct ieee80211_node * ni)3706 ieee80211_ht_check_tx_ht(const struct ieee80211_node *ni)
3707 {
3708 const struct ieee80211vap *vap;
3709 const struct ieee80211_channel *bss_chan;
3710
3711 if (ni == NULL || ni->ni_chan == IEEE80211_CHAN_ANYC ||
3712 ni->ni_vap == NULL || ni->ni_vap->iv_bss == NULL)
3713 return (false);
3714
3715 vap = ni->ni_vap;
3716 bss_chan = vap->iv_bss->ni_chan;
3717
3718 if (bss_chan == IEEE80211_CHAN_ANYC)
3719 return (false);
3720
3721 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
3722 ni->ni_htrates.rs_nrates == 0)
3723 return (false);
3724 return (IEEE80211_IS_CHAN_HT(ni->ni_chan));
3725 }
3726
3727 /*
3728 * Return true if HT40 rates can be transmitted to the given node.
3729 *
3730 * This verifies that the BSS is HT40 capable and the current
3731 * node channel width is 40MHz.
3732 */
3733 bool
ieee80211_ht_check_tx_ht40(const struct ieee80211_node * ni)3734 ieee80211_ht_check_tx_ht40(const struct ieee80211_node *ni)
3735 {
3736 struct ieee80211vap *vap;
3737 struct ieee80211_channel *bss_chan;
3738
3739 if (! ieee80211_ht_check_tx_ht(ni))
3740 return (false);
3741
3742 vap = ni->ni_vap;
3743 bss_chan = vap->iv_bss->ni_chan;
3744
3745 return (IEEE80211_IS_CHAN_HT40(bss_chan) &&
3746 IEEE80211_IS_CHAN_HT40(ni->ni_chan) &&
3747 (ni->ni_chw == IEEE80211_STA_RX_BW_40));
3748 }
3749