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 #include <sys/cdefs.h>
29 #ifdef __FreeBSD__
30 #endif
31
32 /*
33 * IEEE 802.11n protocol support.
34 */
35
36 #include "opt_inet.h"
37 #include "opt_wlan.h"
38
39 #include <sys/param.h>
40 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/systm.h>
43 #include <sys/endian.h>
44
45 #include <sys/socket.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_media.h>
50 #include <net/ethernet.h>
51
52 #include <net80211/ieee80211_var.h>
53 #include <net80211/ieee80211_action.h>
54 #include <net80211/ieee80211_input.h>
55
56 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
57 { 13, 14, 27, 30 }, /* MCS 0 */
58 { 26, 29, 54, 60 }, /* MCS 1 */
59 { 39, 43, 81, 90 }, /* MCS 2 */
60 { 52, 58, 108, 120 }, /* MCS 3 */
61 { 78, 87, 162, 180 }, /* MCS 4 */
62 { 104, 116, 216, 240 }, /* MCS 5 */
63 { 117, 130, 243, 270 }, /* MCS 6 */
64 { 130, 144, 270, 300 }, /* MCS 7 */
65 { 26, 29, 54, 60 }, /* MCS 8 */
66 { 52, 58, 108, 120 }, /* MCS 9 */
67 { 78, 87, 162, 180 }, /* MCS 10 */
68 { 104, 116, 216, 240 }, /* MCS 11 */
69 { 156, 173, 324, 360 }, /* MCS 12 */
70 { 208, 231, 432, 480 }, /* MCS 13 */
71 { 234, 260, 486, 540 }, /* MCS 14 */
72 { 260, 289, 540, 600 }, /* MCS 15 */
73 { 39, 43, 81, 90 }, /* MCS 16 */
74 { 78, 87, 162, 180 }, /* MCS 17 */
75 { 117, 130, 243, 270 }, /* MCS 18 */
76 { 156, 173, 324, 360 }, /* MCS 19 */
77 { 234, 260, 486, 540 }, /* MCS 20 */
78 { 312, 347, 648, 720 }, /* MCS 21 */
79 { 351, 390, 729, 810 }, /* MCS 22 */
80 { 390, 433, 810, 900 }, /* MCS 23 */
81 { 52, 58, 108, 120 }, /* MCS 24 */
82 { 104, 116, 216, 240 }, /* MCS 25 */
83 { 156, 173, 324, 360 }, /* MCS 26 */
84 { 208, 231, 432, 480 }, /* MCS 27 */
85 { 312, 347, 648, 720 }, /* MCS 28 */
86 { 416, 462, 864, 960 }, /* MCS 29 */
87 { 468, 520, 972, 1080 }, /* MCS 30 */
88 { 520, 578, 1080, 1200 }, /* MCS 31 */
89 { 0, 0, 12, 13 }, /* MCS 32 */
90 { 78, 87, 162, 180 }, /* MCS 33 */
91 { 104, 116, 216, 240 }, /* MCS 34 */
92 { 130, 144, 270, 300 }, /* MCS 35 */
93 { 117, 130, 243, 270 }, /* MCS 36 */
94 { 156, 173, 324, 360 }, /* MCS 37 */
95 { 195, 217, 405, 450 }, /* MCS 38 */
96 { 104, 116, 216, 240 }, /* MCS 39 */
97 { 130, 144, 270, 300 }, /* MCS 40 */
98 { 130, 144, 270, 300 }, /* MCS 41 */
99 { 156, 173, 324, 360 }, /* MCS 42 */
100 { 182, 202, 378, 420 }, /* MCS 43 */
101 { 182, 202, 378, 420 }, /* MCS 44 */
102 { 208, 231, 432, 480 }, /* MCS 45 */
103 { 156, 173, 324, 360 }, /* MCS 46 */
104 { 195, 217, 405, 450 }, /* MCS 47 */
105 { 195, 217, 405, 450 }, /* MCS 48 */
106 { 234, 260, 486, 540 }, /* MCS 49 */
107 { 273, 303, 567, 630 }, /* MCS 50 */
108 { 273, 303, 567, 630 }, /* MCS 51 */
109 { 312, 347, 648, 720 }, /* MCS 52 */
110 { 130, 144, 270, 300 }, /* MCS 53 */
111 { 156, 173, 324, 360 }, /* MCS 54 */
112 { 182, 202, 378, 420 }, /* MCS 55 */
113 { 156, 173, 324, 360 }, /* MCS 56 */
114 { 182, 202, 378, 420 }, /* MCS 57 */
115 { 208, 231, 432, 480 }, /* MCS 58 */
116 { 234, 260, 486, 540 }, /* MCS 59 */
117 { 208, 231, 432, 480 }, /* MCS 60 */
118 { 234, 260, 486, 540 }, /* MCS 61 */
119 { 260, 289, 540, 600 }, /* MCS 62 */
120 { 260, 289, 540, 600 }, /* MCS 63 */
121 { 286, 318, 594, 660 }, /* MCS 64 */
122 { 195, 217, 405, 450 }, /* MCS 65 */
123 { 234, 260, 486, 540 }, /* MCS 66 */
124 { 273, 303, 567, 630 }, /* MCS 67 */
125 { 234, 260, 486, 540 }, /* MCS 68 */
126 { 273, 303, 567, 630 }, /* MCS 69 */
127 { 312, 347, 648, 720 }, /* MCS 70 */
128 { 351, 390, 729, 810 }, /* MCS 71 */
129 { 312, 347, 648, 720 }, /* MCS 72 */
130 { 351, 390, 729, 810 }, /* MCS 73 */
131 { 390, 433, 810, 900 }, /* MCS 74 */
132 { 390, 433, 810, 900 }, /* MCS 75 */
133 { 429, 477, 891, 990 }, /* MCS 76 */
134 };
135
136 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
137 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age,
138 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
139 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
140 "AMPDU max reorder age (ms)");
141
142 static int ieee80211_recv_bar_ena = 1;
143 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
144 0, "BAR frame processing (ena/dis)");
145
146 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
147 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout,
148 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
149 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
150 "ADDBA request timeout (ms)");
151 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
152 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff,
153 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
154 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
155 "ADDBA request backoff (ms)");
156 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
157 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
158 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
159
160 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
161 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
162
163 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
164 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
165 static ieee80211_recv_action_func ht_recv_action_ba_delba;
166 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
167 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
168
169 static ieee80211_send_action_func ht_send_action_ba_addba;
170 static ieee80211_send_action_func ht_send_action_ba_delba;
171 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
172
173 static void
ieee80211_ht_init(void)174 ieee80211_ht_init(void)
175 {
176 /*
177 * Setup HT parameters that depends on the clock frequency.
178 */
179 ieee80211_ampdu_age = msecs_to_ticks(500);
180 ieee80211_addba_timeout = msecs_to_ticks(250);
181 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
182 ieee80211_bar_timeout = msecs_to_ticks(250);
183 /*
184 * Register action frame handlers.
185 */
186 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
187 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
188 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
189 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
190 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
191 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
192 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
193 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
194 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
195 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
196
197 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
198 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
199 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
200 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
201 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
202 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
203 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
204 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
205 }
206 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
207
208 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
209 struct ieee80211_tx_ampdu *tap);
210 static int ieee80211_addba_request(struct ieee80211_node *ni,
211 struct ieee80211_tx_ampdu *tap,
212 int dialogtoken, int baparamset, int batimeout);
213 static int ieee80211_addba_response(struct ieee80211_node *ni,
214 struct ieee80211_tx_ampdu *tap,
215 int code, int baparamset, int batimeout);
216 static void ieee80211_addba_stop(struct ieee80211_node *ni,
217 struct ieee80211_tx_ampdu *tap);
218 static void null_addba_response_timeout(struct ieee80211_node *ni,
219 struct ieee80211_tx_ampdu *tap);
220
221 static void ieee80211_bar_response(struct ieee80211_node *ni,
222 struct ieee80211_tx_ampdu *tap, int status);
223 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
224 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
225 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
226 int baparamset, int batimeout, int baseqctl);
227 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
228
229 void
ieee80211_ht_attach(struct ieee80211com * ic)230 ieee80211_ht_attach(struct ieee80211com *ic)
231 {
232 /* setup default aggregation policy */
233 ic->ic_recv_action = ieee80211_recv_action;
234 ic->ic_send_action = ieee80211_send_action;
235 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
236 ic->ic_addba_request = ieee80211_addba_request;
237 ic->ic_addba_response = ieee80211_addba_response;
238 ic->ic_addba_response_timeout = null_addba_response_timeout;
239 ic->ic_addba_stop = ieee80211_addba_stop;
240 ic->ic_bar_response = ieee80211_bar_response;
241 ic->ic_ampdu_rx_start = ampdu_rx_start;
242 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
243
244 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
245 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
246 }
247
248 void
ieee80211_ht_detach(struct ieee80211com * ic)249 ieee80211_ht_detach(struct ieee80211com *ic)
250 {
251 }
252
253 void
ieee80211_ht_vattach(struct ieee80211vap * vap)254 ieee80211_ht_vattach(struct ieee80211vap *vap)
255 {
256
257 /* driver can override defaults */
258 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
259 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
260 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
261 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
262 /* tx aggregation traffic thresholds */
263 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
264 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
265 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
266 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
267
268 vap->iv_htprotmode = IEEE80211_PROT_RTSCTS;
269 vap->iv_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
270
271 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
272 /*
273 * Device is HT capable; enable all HT-related
274 * facilities by default.
275 * XXX these choices may be too aggressive.
276 */
277 vap->iv_flags_ht |= IEEE80211_FHT_HT
278 | IEEE80211_FHT_HTCOMPAT
279 ;
280 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
281 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
282 /* XXX infer from channel list? */
283 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
284 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
285 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
286 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
287 }
288 /* enable RIFS if capable */
289 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
290 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
291
292 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
293 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
294 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
295 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
296 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
297 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
298 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
299
300 if (vap->iv_htcaps & IEEE80211_HTCAP_TXSTBC)
301 vap->iv_flags_ht |= IEEE80211_FHT_STBC_TX;
302 if (vap->iv_htcaps & IEEE80211_HTCAP_RXSTBC)
303 vap->iv_flags_ht |= IEEE80211_FHT_STBC_RX;
304
305 if (vap->iv_htcaps & IEEE80211_HTCAP_LDPC)
306 vap->iv_flags_ht |= IEEE80211_FHT_LDPC_RX;
307 if (vap->iv_htcaps & IEEE80211_HTC_TXLDPC)
308 vap->iv_flags_ht |= IEEE80211_FHT_LDPC_TX;
309 }
310 /* NB: disable default legacy WDS, too many issues right now */
311 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
312 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
313 }
314
315 void
ieee80211_ht_vdetach(struct ieee80211vap * vap)316 ieee80211_ht_vdetach(struct ieee80211vap *vap)
317 {
318 }
319
320 static int
ht_getrate(struct ieee80211com * ic,int index,enum ieee80211_phymode mode,int ratetype)321 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
322 int ratetype)
323 {
324 int mword, rate;
325
326 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
327 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
328 return (0);
329 switch (ratetype) {
330 case 0:
331 rate = ieee80211_htrates[index].ht20_rate_800ns;
332 break;
333 case 1:
334 rate = ieee80211_htrates[index].ht20_rate_400ns;
335 break;
336 case 2:
337 rate = ieee80211_htrates[index].ht40_rate_800ns;
338 break;
339 default:
340 rate = ieee80211_htrates[index].ht40_rate_400ns;
341 break;
342 }
343 return (rate);
344 }
345
346 static struct printranges {
347 int minmcs;
348 int maxmcs;
349 int txstream;
350 int ratetype;
351 int htcapflags;
352 } ranges[] = {
353 { 0, 7, 1, 0, 0 },
354 { 8, 15, 2, 0, 0 },
355 { 16, 23, 3, 0, 0 },
356 { 24, 31, 4, 0, 0 },
357 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
358 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
359 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
360 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
361 { 0, 0, 0, 0, 0 },
362 };
363
364 static void
ht_rateprint(struct ieee80211com * ic,enum ieee80211_phymode mode,int ratetype)365 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
366 {
367 int minrate, maxrate;
368 struct printranges *range;
369
370 for (range = ranges; range->txstream != 0; range++) {
371 if (ic->ic_txstream < range->txstream)
372 continue;
373 if (range->htcapflags &&
374 (ic->ic_htcaps & range->htcapflags) == 0)
375 continue;
376 if (ratetype < range->ratetype)
377 continue;
378 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
379 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
380 if (range->maxmcs) {
381 ic_printf(ic, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
382 range->minmcs, range->maxmcs,
383 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
384 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
385 } else {
386 ic_printf(ic, "MCS %d: %d%sMbps\n", range->minmcs,
387 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
388 }
389 }
390 }
391
392 static void
ht_announce(struct ieee80211com * ic,enum ieee80211_phymode mode)393 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
394 {
395 const char *modestr = ieee80211_phymode_name[mode];
396
397 ic_printf(ic, "%s MCS 20MHz\n", modestr);
398 ht_rateprint(ic, mode, 0);
399 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
400 ic_printf(ic, "%s MCS 20MHz SGI\n", modestr);
401 ht_rateprint(ic, mode, 1);
402 }
403 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
404 ic_printf(ic, "%s MCS 40MHz:\n", modestr);
405 ht_rateprint(ic, mode, 2);
406 }
407 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
408 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
409 ic_printf(ic, "%s MCS 40MHz SGI:\n", modestr);
410 ht_rateprint(ic, mode, 3);
411 }
412 }
413
414 void
ieee80211_ht_announce(struct ieee80211com * ic)415 ieee80211_ht_announce(struct ieee80211com *ic)
416 {
417
418 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
419 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
420 ic_printf(ic, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
421 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
422 ht_announce(ic, IEEE80211_MODE_11NA);
423 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
424 ht_announce(ic, IEEE80211_MODE_11NG);
425 }
426
427 void
ieee80211_init_suphtrates(struct ieee80211com * ic)428 ieee80211_init_suphtrates(struct ieee80211com *ic)
429 {
430 #define ADDRATE(x) do { \
431 htrateset->rs_rates[htrateset->rs_nrates] = x; \
432 htrateset->rs_nrates++; \
433 } while (0)
434 struct ieee80211_htrateset *htrateset = &ic->ic_sup_htrates;
435 int i;
436
437 memset(htrateset, 0, sizeof(struct ieee80211_htrateset));
438 for (i = 0; i < ic->ic_txstream * 8; i++)
439 ADDRATE(i);
440 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
441 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
442 ADDRATE(32);
443 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
444 if (ic->ic_txstream >= 2) {
445 for (i = 33; i <= 38; i++)
446 ADDRATE(i);
447 }
448 if (ic->ic_txstream >= 3) {
449 for (i = 39; i <= 52; i++)
450 ADDRATE(i);
451 }
452 if (ic->ic_txstream == 4) {
453 for (i = 53; i <= 76; i++)
454 ADDRATE(i);
455 }
456 }
457 #undef ADDRATE
458 }
459
460 /*
461 * Receive processing.
462 */
463
464 /*
465 * Decap the encapsulated A-MSDU frames and dispatch all but
466 * the last for delivery. The last frame is returned for
467 * delivery via the normal path.
468 */
469 struct mbuf *
ieee80211_decap_amsdu(struct ieee80211_node * ni,struct mbuf * m)470 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
471 {
472 struct ieee80211vap *vap = ni->ni_vap;
473 int framelen;
474 struct mbuf *n;
475
476 /* discard 802.3 header inserted by ieee80211_decap */
477 m_adj(m, sizeof(struct ether_header));
478
479 vap->iv_stats.is_amsdu_decap++;
480
481 for (;;) {
482 /*
483 * Decap the first frame, bust it apart from the
484 * remainder and deliver. We leave the last frame
485 * delivery to the caller (for consistency with other
486 * code paths, could also do it here).
487 */
488 m = ieee80211_decap1(m, &framelen);
489 if (m == NULL) {
490 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
491 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
492 vap->iv_stats.is_amsdu_tooshort++;
493 return NULL;
494 }
495 if (m->m_pkthdr.len == framelen)
496 break;
497 n = m_split(m, framelen, IEEE80211_M_NOWAIT);
498 if (n == NULL) {
499 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
500 ni->ni_macaddr, "a-msdu",
501 "%s", "unable to split encapsulated frames");
502 vap->iv_stats.is_amsdu_split++;
503 m_freem(m); /* NB: must reclaim */
504 return NULL;
505 }
506 vap->iv_deliver_data(vap, ni, m);
507
508 /*
509 * Remove frame contents; each intermediate frame
510 * is required to be aligned to a 4-byte boundary.
511 */
512 m = n;
513 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
514 }
515 return m; /* last delivered by caller */
516 }
517
518 static void
ampdu_rx_purge_slot(struct ieee80211_rx_ampdu * rap,int i)519 ampdu_rx_purge_slot(struct ieee80211_rx_ampdu *rap, int i)
520 {
521 struct mbuf *m;
522
523 /* Walk the queue, removing frames as appropriate */
524 for (;;) {
525 m = mbufq_dequeue(&rap->rxa_mq[i]);
526 if (m == NULL)
527 break;
528 rap->rxa_qbytes -= m->m_pkthdr.len;
529 rap->rxa_qframes--;
530 m_freem(m);
531 }
532 }
533
534 /*
535 * Add the given frame to the current RX reorder slot.
536 *
537 * For future offloaded A-MSDU handling where multiple frames with
538 * the same sequence number show up here, this routine will append
539 * those frames as long as they're appropriately tagged.
540 */
541 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)542 ampdu_rx_add_slot(struct ieee80211_rx_ampdu *rap, int off, int tid,
543 ieee80211_seq rxseq,
544 struct ieee80211_node *ni,
545 struct mbuf *m,
546 const struct ieee80211_rx_stats *rxs)
547 {
548 const struct ieee80211_rx_stats *rxs_final = NULL;
549 struct ieee80211vap *vap = ni->ni_vap;
550 int toss_dup;
551 #define PROCESS 0 /* caller should process frame */
552 #define CONSUMED 1 /* frame consumed, caller does nothing */
553
554 /*
555 * Figure out if this is a duplicate frame for the given slot.
556 *
557 * We're assuming that the driver will hand us all the frames
558 * for a given AMSDU decap pass and if we get /a/ frame
559 * for an AMSDU decap then we'll get all of them.
560 *
561 * The tricksy bit is that we don't know when the /end/ of
562 * the decap pass is, because we aren't tracking state here
563 * per-slot to know that we've finished receiving the frame list.
564 *
565 * The driver sets RX_F_AMSDU and RX_F_AMSDU_MORE to tell us
566 * what's going on; so ideally we'd just check the frame at the
567 * end of the reassembly slot to see if its F_AMSDU w/ no F_AMSDU_MORE -
568 * that means we've received the whole AMSDU decap pass.
569 */
570
571 /*
572 * Get the rxs of the final mbuf in the slot, if one exists.
573 */
574 if (!mbufq_empty(&rap->rxa_mq[off])) {
575 rxs_final = ieee80211_get_rx_params_ptr(mbufq_last(&rap->rxa_mq[off]));
576 }
577
578 /* Default to tossing the duplicate frame */
579 toss_dup = 1;
580
581 /*
582 * Check to see if the final frame has F_AMSDU and F_AMSDU set, AND
583 * this frame has F_AMSDU set (MORE or otherwise.) That's a sign
584 * that more can come.
585 */
586
587 if ((rxs != NULL) && (rxs_final != NULL) &&
588 ieee80211_check_rxseq_amsdu(rxs) &&
589 ieee80211_check_rxseq_amsdu(rxs_final)) {
590 if (! ieee80211_check_rxseq_amsdu_more(rxs_final)) {
591 /*
592 * amsdu_more() returning 0 means "it's not the
593 * final frame" so we can append more
594 * frames here.
595 */
596 toss_dup = 0;
597 }
598 }
599
600 /*
601 * If the list is empty OR we have determined we can put more
602 * driver decap'ed AMSDU frames in here, then insert.
603 */
604 if (mbufq_empty(&rap->rxa_mq[off]) || (toss_dup == 0)) {
605 if (mbufq_enqueue(&rap->rxa_mq[off], m) != 0) {
606 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
607 ni->ni_macaddr,
608 "a-mpdu queue fail",
609 "seqno %u tid %u BA win <%u:%u> off=%d, qlen=%d, maxqlen=%d",
610 rxseq, tid, rap->rxa_start,
611 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
612 off,
613 mbufq_len(&rap->rxa_mq[off]),
614 rap->rxa_mq[off].mq_maxlen);
615 /* XXX error count */
616 m_freem(m);
617 return CONSUMED;
618 }
619 rap->rxa_qframes++;
620 rap->rxa_qbytes += m->m_pkthdr.len;
621 vap->iv_stats.is_ampdu_rx_reorder++;
622 /*
623 * Statistics for AMSDU decap.
624 */
625 if (rxs != NULL && ieee80211_check_rxseq_amsdu(rxs)) {
626 if (ieee80211_check_rxseq_amsdu_more(rxs)) {
627 /* more=1, AMSDU, end of batch */
628 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
629 } else {
630 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
631 }
632 }
633 } else {
634 IEEE80211_DISCARD_MAC(vap,
635 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
636 ni->ni_macaddr, "a-mpdu duplicate",
637 "seqno %u tid %u BA win <%u:%u>",
638 rxseq, tid, rap->rxa_start,
639 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
640 if (rxs != NULL) {
641 IEEE80211_DISCARD_MAC(vap,
642 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
643 ni->ni_macaddr, "a-mpdu duplicate",
644 "seqno %d tid %u pktflags 0x%08x\n",
645 rxseq, tid, rxs->c_pktflags);
646 }
647 if (rxs_final != NULL) {
648 IEEE80211_DISCARD_MAC(vap,
649 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
650 ni->ni_macaddr, "a-mpdu duplicate",
651 "final: pktflags 0x%08x\n",
652 rxs_final->c_pktflags);
653 }
654 vap->iv_stats.is_rx_dup++;
655 IEEE80211_NODE_STAT(ni, rx_dup);
656 m_freem(m);
657 }
658 return CONSUMED;
659 #undef CONSUMED
660 #undef PROCESS
661 }
662
663 /*
664 * Purge all frames in the A-MPDU re-order queue.
665 */
666 static void
ampdu_rx_purge(struct ieee80211_rx_ampdu * rap)667 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
668 {
669 int i;
670
671 for (i = 0; i < rap->rxa_wnd; i++) {
672 ampdu_rx_purge_slot(rap, i);
673 if (rap->rxa_qframes == 0)
674 break;
675 }
676 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
677 ("lost %u data, %u frames on ampdu rx q",
678 rap->rxa_qbytes, rap->rxa_qframes));
679 }
680
681 static void
ieee80211_ampdu_rx_init_rap(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)682 ieee80211_ampdu_rx_init_rap(struct ieee80211_node *ni,
683 struct ieee80211_rx_ampdu *rap)
684 {
685 int i;
686
687 /* XXX TODO: ensure the queues are empty */
688 memset(rap, 0, sizeof(*rap));
689 for (i = 0; i < IEEE80211_AGGR_BAWMAX; i++)
690 mbufq_init(&rap->rxa_mq[i], 256);
691 }
692
693 /*
694 * Start A-MPDU rx/re-order processing for the specified TID.
695 */
696 static int
ampdu_rx_start(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,int baparamset,int batimeout,int baseqctl)697 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
698 int baparamset, int batimeout, int baseqctl)
699 {
700 struct ieee80211vap *vap = ni->ni_vap;
701 int bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
702
703 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
704 /*
705 * AMPDU previously setup and not terminated with a DELBA,
706 * flush the reorder q's in case anything remains.
707 */
708 ampdu_rx_purge(rap);
709 }
710 ieee80211_ampdu_rx_init_rap(ni, rap);
711 rap->rxa_wnd = (bufsiz == 0) ?
712 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
713 rap->rxa_start = _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_START);
714 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
715
716 /* XXX this should be a configuration flag */
717 if ((vap->iv_htcaps & IEEE80211_HTC_RX_AMSDU_AMPDU) &&
718 (_IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU)))
719 rap->rxa_flags |= IEEE80211_AGGR_AMSDU;
720 else
721 rap->rxa_flags &= ~IEEE80211_AGGR_AMSDU;
722
723 return 0;
724 }
725
726 /*
727 * Public function; manually setup the RX ampdu state.
728 */
729 int
ieee80211_ampdu_rx_start_ext(struct ieee80211_node * ni,int tid,int seq,int baw)730 ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid, int seq, int baw)
731 {
732 struct ieee80211_rx_ampdu *rap;
733
734 /* XXX TODO: sanity check tid, seq, baw */
735
736 rap = &ni->ni_rx_ampdu[tid];
737
738 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
739 /*
740 * AMPDU previously setup and not terminated with a DELBA,
741 * flush the reorder q's in case anything remains.
742 */
743 ampdu_rx_purge(rap);
744 }
745
746 ieee80211_ampdu_rx_init_rap(ni, rap);
747
748 rap->rxa_wnd = (baw== 0) ?
749 IEEE80211_AGGR_BAWMAX : min(baw, IEEE80211_AGGR_BAWMAX);
750 if (seq == -1) {
751 /* Wait for the first RX frame, use that as BAW */
752 rap->rxa_start = 0;
753 rap->rxa_flags |= IEEE80211_AGGR_WAITRX;
754 } else {
755 rap->rxa_start = seq;
756 }
757 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
758
759 /* XXX TODO: no amsdu flag */
760
761 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
762 "%s: tid=%d, start=%d, wnd=%d, flags=0x%08x",
763 __func__,
764 tid,
765 seq,
766 rap->rxa_wnd,
767 rap->rxa_flags);
768
769 return 0;
770 }
771
772 /*
773 * Public function; manually stop the RX AMPDU state.
774 */
775 void
ieee80211_ampdu_rx_stop_ext(struct ieee80211_node * ni,int tid)776 ieee80211_ampdu_rx_stop_ext(struct ieee80211_node *ni, int tid)
777 {
778 struct ieee80211_rx_ampdu *rap;
779
780 /* XXX TODO: sanity check tid, seq, baw */
781 rap = &ni->ni_rx_ampdu[tid];
782 ampdu_rx_stop(ni, rap);
783 }
784
785 /*
786 * Stop A-MPDU rx processing for the specified TID.
787 */
788 static void
ampdu_rx_stop(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)789 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
790 {
791
792 ampdu_rx_purge(rap);
793 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING
794 | IEEE80211_AGGR_XCHGPEND
795 | IEEE80211_AGGR_WAITRX);
796 }
797
798 /*
799 * Dispatch a frame from the A-MPDU reorder queue. The
800 * frame is fed back into ieee80211_input marked with an
801 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
802 * permits ieee80211_input to optimize re-processing).
803 */
804 static __inline void
ampdu_dispatch(struct ieee80211_node * ni,struct mbuf * m)805 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
806 {
807 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
808 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
809 (void) ieee80211_input(ni, m, 0, 0);
810 }
811
812 static int
ampdu_dispatch_slot(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni,int i)813 ampdu_dispatch_slot(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni,
814 int i)
815 {
816 struct mbuf *m;
817 int n = 0;
818
819 for (;;) {
820 m = mbufq_dequeue(&rap->rxa_mq[i]);
821 if (m == NULL)
822 break;
823 n++;
824
825 rap->rxa_qbytes -= m->m_pkthdr.len;
826 rap->rxa_qframes--;
827
828 ampdu_dispatch(ni, m);
829 }
830 return (n);
831 }
832
833 static void
ampdu_rx_moveup(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni,int i,int winstart)834 ampdu_rx_moveup(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni,
835 int i, int winstart)
836 {
837 struct ieee80211vap *vap = ni->ni_vap;
838
839 /*
840 * If frames remain, copy the mbuf pointers down so
841 * they correspond to the offsets in the new window.
842 */
843 if (rap->rxa_qframes != 0) {
844 int n = rap->rxa_qframes, j;
845 for (j = i+1; j < rap->rxa_wnd; j++) {
846 /*
847 * Concat the list contents over, which will
848 * blank the source list for us.
849 */
850 if (mbufq_len(&rap->rxa_mq[j]) != 0) {
851 n = n - mbufq_len(&rap->rxa_mq[j]);
852 mbufq_concat(&rap->rxa_mq[j-i], &rap->rxa_mq[j]);
853 KASSERT(n >= 0, ("%s: n < 0 (%d)", __func__, n));
854 if (n == 0)
855 break;
856 }
857 }
858 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
859 "BA win <%d:%d> winstart %d",
860 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
861 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
862 winstart));
863 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
864 }
865 }
866
867 /*
868 * Dispatch as many frames as possible from the re-order queue.
869 * Frames will always be "at the front"; we process all frames
870 * up to the first empty slot in the window. On completion we
871 * cleanup state if there are still pending frames in the current
872 * BA window. We assume the frame at slot 0 is already handled
873 * by the caller; we always start at slot 1.
874 */
875 static void
ampdu_rx_dispatch(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni)876 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
877 {
878 struct ieee80211vap *vap = ni->ni_vap;
879 int i, r, r2;
880
881 /* flush run of frames */
882 r2 = 0;
883 for (i = 1; i < rap->rxa_wnd; i++) {
884 r = ampdu_dispatch_slot(rap, ni, i);
885 if (r == 0)
886 break;
887 r2 += r;
888 }
889
890 /* move up frames */
891 ampdu_rx_moveup(rap, ni, i, -1);
892
893 /*
894 * Adjust the start of the BA window to
895 * reflect the frames just dispatched.
896 */
897 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
898 vap->iv_stats.is_ampdu_rx_oor += r2;
899
900 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
901 "%s: moved slot up %d slots to start at %d (%d frames)",
902 __func__,
903 i,
904 rap->rxa_start,
905 r2);
906 }
907
908 /*
909 * Dispatch all frames in the A-MPDU re-order queue.
910 */
911 static void
ampdu_rx_flush(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)912 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
913 {
914 int i, r;
915
916 for (i = 0; i < rap->rxa_wnd; i++) {
917 r = ampdu_dispatch_slot(rap, ni, i);
918 if (r == 0)
919 continue;
920 ni->ni_vap->iv_stats.is_ampdu_rx_oor += r;
921
922 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
923 "%s: moved slot up %d slots to start at %d (%d frames)",
924 __func__,
925 1,
926 rap->rxa_start,
927 r);
928
929 if (rap->rxa_qframes == 0)
930 break;
931 }
932 }
933
934 /*
935 * Dispatch all frames in the A-MPDU re-order queue
936 * preceding the specified sequence number. This logic
937 * handles window moves due to a received MSDU or BAR.
938 */
939 static void
ampdu_rx_flush_upto(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,ieee80211_seq winstart)940 ampdu_rx_flush_upto(struct ieee80211_node *ni,
941 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
942 {
943 struct ieee80211vap *vap = ni->ni_vap;
944 ieee80211_seq seqno;
945 int i, r;
946
947 /*
948 * Flush any complete MSDU's with a sequence number lower
949 * than winstart. Gaps may exist. Note that we may actually
950 * dispatch frames past winstart if a run continues; this is
951 * an optimization that avoids having to do a separate pass
952 * to dispatch frames after moving the BA window start.
953 */
954 seqno = rap->rxa_start;
955 for (i = 0; i < rap->rxa_wnd; i++) {
956 if ((r = mbufq_len(&rap->rxa_mq[i])) != 0) {
957 (void) ampdu_dispatch_slot(rap, ni, i);
958 } else {
959 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
960 break;
961 }
962 vap->iv_stats.is_ampdu_rx_oor += r;
963 seqno = IEEE80211_SEQ_INC(seqno);
964
965 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
966 "%s: moved slot up %d slots to start at %d (%d frames)",
967 __func__,
968 1,
969 seqno,
970 r);
971 }
972
973 /*
974 * If frames remain, copy the mbuf pointers down so
975 * they correspond to the offsets in the new window.
976 */
977 ampdu_rx_moveup(rap, ni, i, winstart);
978
979 /*
980 * Move the start of the BA window; we use the
981 * sequence number of the last MSDU that was
982 * passed up the stack+1 or winstart if stopped on
983 * a gap in the reorder buffer.
984 */
985 rap->rxa_start = seqno;
986 }
987
988 /*
989 * Process a received QoS data frame for an HT station. Handle
990 * A-MPDU reordering: if this frame is received out of order
991 * and falls within the BA window hold onto it. Otherwise if
992 * this frame completes a run, flush any pending frames. We
993 * return 1 if the frame is consumed. A 0 is returned if
994 * the frame should be processed normally by the caller.
995 *
996 * A-MSDU: handle hardware decap'ed A-MSDU frames that are
997 * pretending to be MPDU's. They're dispatched directly if
998 * able; or attempted to put into the receive reordering slot.
999 */
1000 int
ieee80211_ampdu_reorder(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs)1001 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m,
1002 const struct ieee80211_rx_stats *rxs)
1003 {
1004 #define PROCESS 0 /* caller should process frame */
1005 #define CONSUMED 1 /* frame consumed, caller does nothing */
1006 struct ieee80211vap *vap = ni->ni_vap;
1007 struct ieee80211_qosframe *wh;
1008 struct ieee80211_rx_ampdu *rap;
1009 ieee80211_seq rxseq;
1010 uint8_t tid;
1011 int off;
1012 int amsdu = ieee80211_check_rxseq_amsdu(rxs);
1013 int amsdu_end = ieee80211_check_rxseq_amsdu_more(rxs);
1014
1015 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
1016 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
1017 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1018
1019 /* NB: m_len known to be sufficient */
1020 wh = mtod(m, struct ieee80211_qosframe *);
1021 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
1022 /*
1023 * Not QoS data, shouldn't get here but just
1024 * return it to the caller for processing.
1025 */
1026 return PROCESS;
1027 }
1028
1029 /*
1030 * 802.11-2012 9.3.2.10 - Duplicate detection and recovery.
1031 *
1032 * Multicast QoS data frames are checked against a different
1033 * counter, not the per-TID counter.
1034 */
1035 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
1036 return PROCESS;
1037
1038 tid = ieee80211_getqos(wh)[0];
1039 tid &= IEEE80211_QOS_TID;
1040 rap = &ni->ni_rx_ampdu[tid];
1041 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1042 /*
1043 * No ADDBA request yet, don't touch.
1044 */
1045 return PROCESS;
1046 }
1047 rxseq = le16toh(*(uint16_t *)wh->i_seq);
1048 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
1049 /*
1050 * Fragments are not allowed; toss.
1051 */
1052 IEEE80211_DISCARD_MAC(vap,
1053 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1054 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
1055 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1056 vap->iv_stats.is_ampdu_rx_drop++;
1057 IEEE80211_NODE_STAT(ni, rx_drop);
1058 m_freem(m);
1059 return CONSUMED;
1060 }
1061 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
1062 rap->rxa_nframes++;
1063
1064 /*
1065 * Handle waiting for the first frame to define the BAW.
1066 * Some firmware doesn't provide the RX of the starting point
1067 * of the BAW and we have to cope.
1068 */
1069 if (rap->rxa_flags & IEEE80211_AGGR_WAITRX) {
1070 rap->rxa_flags &= ~IEEE80211_AGGR_WAITRX;
1071 rap->rxa_start = rxseq;
1072 }
1073 again:
1074 if (rxseq == rap->rxa_start) {
1075 /*
1076 * First frame in window.
1077 */
1078 if (rap->rxa_qframes != 0) {
1079 /*
1080 * Dispatch as many packets as we can.
1081 */
1082 KASSERT(mbufq_empty(&rap->rxa_mq[0]), ("unexpected dup"));
1083 ampdu_dispatch(ni, m);
1084 ampdu_rx_dispatch(rap, ni);
1085 return CONSUMED;
1086 } else {
1087 /*
1088 * In order; advance window if needed and notify
1089 * caller to dispatch directly.
1090 */
1091 if (amsdu) {
1092 if (amsdu_end) {
1093 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
1094 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
1095 } else {
1096 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
1097 }
1098 } else {
1099 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
1100 }
1101 return PROCESS;
1102 }
1103 }
1104 /*
1105 * Frame is out of order; store if in the BA window.
1106 */
1107 /* calculate offset in BA window */
1108 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1109 if (off < rap->rxa_wnd) {
1110 /*
1111 * Common case (hopefully): in the BA window.
1112 * Sec 9.10.7.6.2 a) (p.137)
1113 */
1114
1115 /*
1116 * Check for frames sitting too long in the reorder queue.
1117 * This should only ever happen if frames are not delivered
1118 * without the sender otherwise notifying us (e.g. with a
1119 * BAR to move the window). Typically this happens because
1120 * of vendor bugs that cause the sequence number to jump.
1121 * When this happens we get a gap in the reorder queue that
1122 * leaves frame sitting on the queue until they get pushed
1123 * out due to window moves. When the vendor does not send
1124 * BAR this move only happens due to explicit packet sends
1125 *
1126 * NB: we only track the time of the oldest frame in the
1127 * reorder q; this means that if we flush we might push
1128 * frames that still "new"; if this happens then subsequent
1129 * frames will result in BA window moves which cost something
1130 * but is still better than a big throughput dip.
1131 */
1132 if (rap->rxa_qframes != 0) {
1133 /* XXX honor batimeout? */
1134 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1135 /*
1136 * Too long since we received the first
1137 * frame; flush the reorder buffer.
1138 */
1139 if (rap->rxa_qframes != 0) {
1140 vap->iv_stats.is_ampdu_rx_age +=
1141 rap->rxa_qframes;
1142 ampdu_rx_flush(ni, rap);
1143 }
1144 /*
1145 * Advance the window if needed and notify
1146 * the caller to dispatch directly.
1147 */
1148 if (amsdu) {
1149 if (amsdu_end) {
1150 rap->rxa_start =
1151 IEEE80211_SEQ_INC(rxseq);
1152 IEEE80211_NODE_STAT(ni,
1153 rx_amsdu_more_end);
1154 } else {
1155 IEEE80211_NODE_STAT(ni,
1156 rx_amsdu_more);
1157 }
1158 } else {
1159 rap->rxa_start =
1160 IEEE80211_SEQ_INC(rxseq);
1161 }
1162 return PROCESS;
1163 }
1164 } else {
1165 /*
1166 * First frame, start aging timer.
1167 */
1168 rap->rxa_age = ticks;
1169 }
1170
1171 /* save packet - this consumes, no matter what */
1172 ampdu_rx_add_slot(rap, off, tid, rxseq, ni, m, rxs);
1173 return CONSUMED;
1174 }
1175 if (off < IEEE80211_SEQ_BA_RANGE) {
1176 /*
1177 * Outside the BA window, but within range;
1178 * flush the reorder q and move the window.
1179 * Sec 9.10.7.6.2 b) (p.138)
1180 */
1181 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1182 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
1183 rap->rxa_start,
1184 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1185 rap->rxa_qframes, rxseq, tid);
1186 vap->iv_stats.is_ampdu_rx_move++;
1187
1188 /*
1189 * The spec says to flush frames up to but not including:
1190 * WinStart_B = rxseq - rap->rxa_wnd + 1
1191 * Then insert the frame or notify the caller to process
1192 * it immediately. We can safely do this by just starting
1193 * over again because we know the frame will now be within
1194 * the BA window.
1195 */
1196 /* NB: rxa_wnd known to be >0 */
1197 ampdu_rx_flush_upto(ni, rap,
1198 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
1199 goto again;
1200 } else {
1201 /*
1202 * Outside the BA window and out of range; toss.
1203 * Sec 9.10.7.6.2 c) (p.138)
1204 */
1205 IEEE80211_DISCARD_MAC(vap,
1206 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1207 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1208 rap->rxa_start,
1209 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1210 rap->rxa_qframes, rxseq, tid,
1211 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1212 vap->iv_stats.is_ampdu_rx_drop++;
1213 IEEE80211_NODE_STAT(ni, rx_drop);
1214 m_freem(m);
1215 return CONSUMED;
1216 }
1217 #undef CONSUMED
1218 #undef PROCESS
1219 }
1220
1221 /*
1222 * Process a BAR ctl frame. Dispatch all frames up to
1223 * the sequence number of the frame. If this frame is
1224 * out of range it's discarded.
1225 */
1226 void
ieee80211_recv_bar(struct ieee80211_node * ni,struct mbuf * m0)1227 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
1228 {
1229 struct ieee80211vap *vap = ni->ni_vap;
1230 struct ieee80211_frame_bar *wh;
1231 struct ieee80211_rx_ampdu *rap;
1232 ieee80211_seq rxseq;
1233 int tid, off;
1234
1235 if (!ieee80211_recv_bar_ena) {
1236 #if 0
1237 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
1238 ni->ni_macaddr, "BAR", "%s", "processing disabled");
1239 #endif
1240 vap->iv_stats.is_ampdu_bar_bad++;
1241 return;
1242 }
1243 wh = mtod(m0, struct ieee80211_frame_bar *);
1244 /* XXX check basic BAR */
1245 tid = _IEEE80211_MASKSHIFT(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
1246 rap = &ni->ni_rx_ampdu[tid];
1247 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1248 /*
1249 * No ADDBA request yet, don't touch.
1250 */
1251 IEEE80211_DISCARD_MAC(vap,
1252 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
1253 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
1254 vap->iv_stats.is_ampdu_bar_bad++;
1255 return;
1256 }
1257 vap->iv_stats.is_ampdu_bar_rx++;
1258 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
1259 if (rxseq == rap->rxa_start)
1260 return;
1261 /* calculate offset in BA window */
1262 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1263 if (off < IEEE80211_SEQ_BA_RANGE) {
1264 /*
1265 * Flush the reorder q up to rxseq and move the window.
1266 * Sec 9.10.7.6.3 a) (p.138)
1267 */
1268 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1269 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
1270 rap->rxa_start,
1271 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1272 rap->rxa_qframes, rxseq, tid);
1273 vap->iv_stats.is_ampdu_bar_move++;
1274
1275 ampdu_rx_flush_upto(ni, rap, rxseq);
1276 if (off >= rap->rxa_wnd) {
1277 /*
1278 * BAR specifies a window start to the right of BA
1279 * window; we must move it explicitly since
1280 * ampdu_rx_flush_upto will not.
1281 */
1282 rap->rxa_start = rxseq;
1283 }
1284 } else {
1285 /*
1286 * Out of range; toss.
1287 * Sec 9.10.7.6.3 b) (p.138)
1288 */
1289 IEEE80211_DISCARD_MAC(vap,
1290 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1291 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1292 rap->rxa_start,
1293 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1294 rap->rxa_qframes, rxseq, tid,
1295 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1296 vap->iv_stats.is_ampdu_bar_oow++;
1297 IEEE80211_NODE_STAT(ni, rx_drop);
1298 }
1299 }
1300
1301 /*
1302 * Setup HT-specific state in a node. Called only
1303 * when HT use is negotiated so we don't do extra
1304 * work for temporary and/or legacy sta's.
1305 */
1306 void
ieee80211_ht_node_init(struct ieee80211_node * ni)1307 ieee80211_ht_node_init(struct ieee80211_node *ni)
1308 {
1309 struct ieee80211_tx_ampdu *tap;
1310 int tid;
1311
1312 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1313 ni,
1314 "%s: called (%p)",
1315 __func__,
1316 ni);
1317
1318 if (ni->ni_flags & IEEE80211_NODE_HT) {
1319 /*
1320 * Clean AMPDU state on re-associate. This handles the case
1321 * where a station leaves w/o notifying us and then returns
1322 * before node is reaped for inactivity.
1323 */
1324 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1325 ni,
1326 "%s: calling cleanup (%p)",
1327 __func__, ni);
1328 ieee80211_ht_node_cleanup(ni);
1329 }
1330 for (tid = 0; tid < WME_NUM_TID; tid++) {
1331 tap = &ni->ni_tx_ampdu[tid];
1332 tap->txa_tid = tid;
1333 tap->txa_ni = ni;
1334 ieee80211_txampdu_init_pps(tap);
1335 /* NB: further initialization deferred */
1336 ieee80211_ampdu_rx_init_rap(ni, &ni->ni_rx_ampdu[tid]);
1337 }
1338 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU |
1339 IEEE80211_NODE_AMSDU;
1340 }
1341
1342 /*
1343 * Cleanup HT-specific state in a node. Called only
1344 * when HT use has been marked.
1345 */
1346 void
ieee80211_ht_node_cleanup(struct ieee80211_node * ni)1347 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1348 {
1349 struct ieee80211com *ic = ni->ni_ic;
1350 int i;
1351
1352 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1353 ni,
1354 "%s: called (%p)",
1355 __func__, ni);
1356
1357 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1358
1359 /* XXX optimize this */
1360 for (i = 0; i < WME_NUM_TID; i++) {
1361 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1362 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1363 ampdu_tx_stop(tap);
1364 }
1365 for (i = 0; i < WME_NUM_TID; i++)
1366 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1367
1368 ni->ni_htcap = 0;
1369 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1370 }
1371
1372 /*
1373 * Age out HT resources for a station.
1374 */
1375 void
ieee80211_ht_node_age(struct ieee80211_node * ni)1376 ieee80211_ht_node_age(struct ieee80211_node *ni)
1377 {
1378 struct ieee80211vap *vap = ni->ni_vap;
1379 uint8_t tid;
1380
1381 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1382
1383 for (tid = 0; tid < WME_NUM_TID; tid++) {
1384 struct ieee80211_rx_ampdu *rap;
1385
1386 rap = &ni->ni_rx_ampdu[tid];
1387 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1388 continue;
1389 if (rap->rxa_qframes == 0)
1390 continue;
1391 /*
1392 * Check for frames sitting too long in the reorder queue.
1393 * See above for more details on what's happening here.
1394 */
1395 /* XXX honor batimeout? */
1396 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1397 /*
1398 * Too long since we received the first
1399 * frame; flush the reorder buffer.
1400 */
1401 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1402 ampdu_rx_flush(ni, rap);
1403 }
1404 }
1405 }
1406
1407 static struct ieee80211_channel *
findhtchan(struct ieee80211com * ic,struct ieee80211_channel * c,int htflags)1408 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1409 {
1410 return ieee80211_find_channel(ic, c->ic_freq,
1411 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1412 }
1413
1414 /*
1415 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1416 */
1417 struct ieee80211_channel *
ieee80211_ht_adjust_channel(struct ieee80211com * ic,struct ieee80211_channel * chan,int flags)1418 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1419 struct ieee80211_channel *chan, int flags)
1420 {
1421 struct ieee80211_channel *c;
1422
1423 if (flags & IEEE80211_FHT_HT) {
1424 /* promote to HT if possible */
1425 if (flags & IEEE80211_FHT_USEHT40) {
1426 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1427 /* NB: arbitrarily pick ht40+ over ht40- */
1428 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1429 if (c == NULL)
1430 c = findhtchan(ic, chan,
1431 IEEE80211_CHAN_HT40D);
1432 if (c == NULL)
1433 c = findhtchan(ic, chan,
1434 IEEE80211_CHAN_HT20);
1435 if (c != NULL)
1436 chan = c;
1437 }
1438 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1439 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1440 if (c != NULL)
1441 chan = c;
1442 }
1443 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1444 /* demote to legacy, HT use is disabled */
1445 c = ieee80211_find_channel(ic, chan->ic_freq,
1446 chan->ic_flags &~ IEEE80211_CHAN_HT);
1447 if (c != NULL)
1448 chan = c;
1449 }
1450 return chan;
1451 }
1452
1453 /*
1454 * Setup HT-specific state for a legacy WDS peer.
1455 */
1456 void
ieee80211_ht_wds_init(struct ieee80211_node * ni)1457 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1458 {
1459 struct ieee80211vap *vap = ni->ni_vap;
1460 struct ieee80211_tx_ampdu *tap;
1461 int tid;
1462
1463 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1464
1465 /* XXX check scan cache in case peer has an ap and we have info */
1466 /*
1467 * If setup with a legacy channel; locate an HT channel.
1468 * Otherwise if the inherited channel (from a companion
1469 * AP) is suitable use it so we use the same location
1470 * for the extension channel).
1471 */
1472 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1473 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1474
1475 ni->ni_htcap = 0;
1476 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1477 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1478 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1479 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1480 ni->ni_chw = IEEE80211_STA_RX_BW_40;
1481 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1482 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1483 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1484 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1485 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1486 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1487 } else {
1488 ni->ni_chw = IEEE80211_STA_RX_BW_20;
1489 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1490 }
1491 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1492 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1493 ni->ni_flags |= IEEE80211_NODE_RIFS;
1494 /* XXX does it make sense to enable SMPS? */
1495
1496 ni->ni_htopmode = 0; /* XXX need protection state */
1497 ni->ni_htstbc = 0; /* XXX need info */
1498
1499 for (tid = 0; tid < WME_NUM_TID; tid++) {
1500 tap = &ni->ni_tx_ampdu[tid];
1501 tap->txa_tid = tid;
1502 ieee80211_txampdu_init_pps(tap);
1503 }
1504 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1505 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU |
1506 IEEE80211_NODE_AMSDU;
1507 }
1508
1509 /*
1510 * Notify a VAP of a change in the HTINFO ie if it's a hostap VAP.
1511 *
1512 * This is to be called from the deferred HT protection update
1513 * task once the flags are updated.
1514 */
1515 void
ieee80211_htinfo_notify(struct ieee80211vap * vap)1516 ieee80211_htinfo_notify(struct ieee80211vap *vap)
1517 {
1518
1519 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1520
1521 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1522 return;
1523 if (vap->iv_state != IEEE80211_S_RUN ||
1524 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1525 return;
1526
1527 IEEE80211_NOTE(vap,
1528 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1529 vap->iv_bss,
1530 "HT bss occupancy change: %d sta, %d ht, "
1531 "%d ht40%s, HT protmode now 0x%x"
1532 , vap->iv_sta_assoc
1533 , vap->iv_ht_sta_assoc
1534 , vap->iv_ht40_sta_assoc
1535 , (vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1536 ", non-HT sta present" : ""
1537 , vap->iv_curhtprotmode);
1538
1539 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1540 }
1541
1542 /*
1543 * Calculate HT protection mode from current
1544 * state and handle updates.
1545 */
1546 static void
htinfo_update(struct ieee80211vap * vap)1547 htinfo_update(struct ieee80211vap *vap)
1548 {
1549 struct ieee80211com *ic = vap->iv_ic;
1550 uint8_t protmode;
1551
1552 if (vap->iv_sta_assoc != vap->iv_ht_sta_assoc) {
1553 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1554 | IEEE80211_HTINFO_NONHT_PRESENT;
1555 } else if (vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) {
1556 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1557 | IEEE80211_HTINFO_NONHT_PRESENT;
1558 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1559 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1560 vap->iv_sta_assoc != vap->iv_ht40_sta_assoc) {
1561 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1562 } else {
1563 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1564 }
1565 if (protmode != vap->iv_curhtprotmode) {
1566 vap->iv_curhtprotmode = protmode;
1567 /* Update VAP with new protection mode */
1568 ieee80211_vap_update_ht_protmode(vap);
1569 }
1570 }
1571
1572 /*
1573 * Handle an HT station joining a BSS.
1574 */
1575 void
ieee80211_ht_node_join(struct ieee80211_node * ni)1576 ieee80211_ht_node_join(struct ieee80211_node *ni)
1577 {
1578 struct ieee80211vap *vap = ni->ni_vap;
1579
1580 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1581
1582 if (ni->ni_flags & IEEE80211_NODE_HT) {
1583 vap->iv_ht_sta_assoc++;
1584 if (ni->ni_chw == IEEE80211_STA_RX_BW_40)
1585 vap->iv_ht40_sta_assoc++;
1586 }
1587 htinfo_update(vap);
1588 }
1589
1590 /*
1591 * Handle an HT station leaving a BSS.
1592 */
1593 void
ieee80211_ht_node_leave(struct ieee80211_node * ni)1594 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1595 {
1596 struct ieee80211vap *vap = ni->ni_vap;
1597
1598 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1599
1600 if (ni->ni_flags & IEEE80211_NODE_HT) {
1601 vap->iv_ht_sta_assoc--;
1602 if (ni->ni_chw == IEEE80211_STA_RX_BW_40)
1603 vap->iv_ht40_sta_assoc--;
1604 }
1605 htinfo_update(vap);
1606 }
1607
1608 /*
1609 * Public version of htinfo_update; used for processing
1610 * beacon frames from overlapping bss.
1611 *
1612 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1613 * (on receipt of a beacon that advertises MIXED) or
1614 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1615 * from an overlapping legacy bss). We treat MIXED with
1616 * a higher precedence than PROTOPT (i.e. we will not change
1617 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1618 * corresponds to how we handle things in htinfo_update.
1619 *
1620 */
1621 void
ieee80211_htprot_update(struct ieee80211vap * vap,int protmode)1622 ieee80211_htprot_update(struct ieee80211vap *vap, int protmode)
1623 {
1624 struct ieee80211com *ic = vap->iv_ic;
1625 #define OPMODE(x) _IEEE80211_SHIFTMASK(x, IEEE80211_HTINFO_OPMODE)
1626 IEEE80211_LOCK(ic);
1627
1628 /* track non-HT station presence */
1629 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1630 ("protmode 0x%x", protmode));
1631 vap->iv_flags_ht |= IEEE80211_FHT_NONHT_PR;
1632 vap->iv_lastnonht = ticks;
1633
1634 if (protmode != vap->iv_curhtprotmode &&
1635 (OPMODE(vap->iv_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1636 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1637 vap->iv_curhtprotmode = protmode;
1638 /* Update VAP with new protection mode */
1639 ieee80211_vap_update_ht_protmode(vap);
1640 }
1641 IEEE80211_UNLOCK(ic);
1642 #undef OPMODE
1643 }
1644
1645 /*
1646 * Time out presence of an overlapping bss with non-HT
1647 * stations. When operating in hostap mode we listen for
1648 * beacons from other stations and if we identify a non-HT
1649 * station is present we update the opmode field of the
1650 * HTINFO ie. To identify when all non-HT stations are
1651 * gone we time out this condition.
1652 */
1653 void
ieee80211_ht_timeout(struct ieee80211vap * vap)1654 ieee80211_ht_timeout(struct ieee80211vap *vap)
1655 {
1656
1657 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1658
1659 if ((vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1660 ieee80211_time_after(ticks, vap->iv_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1661 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
1662 "%s", "time out non-HT STA present on channel");
1663 vap->iv_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1664 htinfo_update(vap);
1665 }
1666 }
1667
1668 /*
1669 * Process an 802.11n HT capabilities ie.
1670 */
1671 void
ieee80211_parse_htcap(struct ieee80211_node * ni,const uint8_t * ie)1672 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1673 {
1674 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1675 /*
1676 * Station used Vendor OUI ie to associate;
1677 * mark the node so when we respond we'll use
1678 * the Vendor OUI's and not the standard ie's.
1679 */
1680 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1681 ie += 4;
1682 } else
1683 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1684
1685 ni->ni_htcap = le16dec(ie +
1686 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1687 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1688 }
1689
1690 static void
htinfo_parse(struct ieee80211_node * ni,const struct ieee80211_ie_htinfo * htinfo)1691 htinfo_parse(struct ieee80211_node *ni,
1692 const struct ieee80211_ie_htinfo *htinfo)
1693 {
1694 uint16_t w;
1695
1696 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1697 ni->ni_ht2ndchan = _IEEE80211_SHIFTMASK(htinfo->hi_byte1,
1698 IEEE80211_HTINFO_2NDCHAN);
1699 w = le16dec(&htinfo->hi_byte2);
1700 ni->ni_htopmode = _IEEE80211_SHIFTMASK(w, IEEE80211_HTINFO_OPMODE);
1701 w = le16dec(&htinfo->hi_byte45);
1702 ni->ni_htstbc = _IEEE80211_SHIFTMASK(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1703 }
1704
1705 /*
1706 * Parse an 802.11n HT info ie and save useful information
1707 * to the node state. Note this does not effect any state
1708 * changes such as for channel width change.
1709 */
1710 void
ieee80211_parse_htinfo(struct ieee80211_node * ni,const uint8_t * ie)1711 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1712 {
1713 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1714 ie += 4;
1715 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1716 }
1717
1718 /*
1719 * Handle 11n/11ac channel switch.
1720 *
1721 * Use the received HT/VHT ie's to identify the right channel to use.
1722 * If we cannot locate it in the channel table then fallback to
1723 * legacy operation.
1724 *
1725 * Note that we use this information to identify the node's
1726 * channel only; the caller is responsible for insuring any
1727 * required channel change is done (e.g. in sta mode when
1728 * parsing the contents of a beacon frame).
1729 */
1730 static int
htinfo_update_chw(struct ieee80211_node * ni,int htflags,int vhtflags)1731 htinfo_update_chw(struct ieee80211_node *ni, int htflags, int vhtflags)
1732 {
1733 struct ieee80211com *ic = ni->ni_ic;
1734 struct ieee80211_channel *c;
1735 int chanflags;
1736 int ret = 0;
1737
1738 /*
1739 * First step - do HT/VHT only channel lookup based on operating mode
1740 * flags. This involves masking out the VHT flags as well.
1741 * Otherwise we end up doing the full channel walk each time
1742 * we trigger this, which is expensive.
1743 */
1744 chanflags = (ni->ni_chan->ic_flags &~
1745 (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT)) | htflags | vhtflags;
1746
1747 if (chanflags == ni->ni_chan->ic_flags)
1748 goto done;
1749
1750 /*
1751 * If HT /or/ VHT flags have changed then check both.
1752 * We need to start by picking a HT channel anyway.
1753 */
1754
1755 c = NULL;
1756 chanflags = (ni->ni_chan->ic_flags &~
1757 (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT)) | htflags;
1758 /* XXX not right for ht40- */
1759 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1760 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1761 /*
1762 * No HT40 channel entry in our table; fall back
1763 * to HT20 operation. This should not happen.
1764 */
1765 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1766 #if 0
1767 IEEE80211_NOTE(ni->ni_vap,
1768 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1769 "no HT40 channel (freq %u), falling back to HT20",
1770 ni->ni_chan->ic_freq);
1771 #endif
1772 /* XXX stat */
1773 }
1774
1775 /* Nothing found - leave it alone; move onto VHT */
1776 if (c == NULL)
1777 c = ni->ni_chan;
1778
1779 /*
1780 * If it's non-HT, then bail out now.
1781 */
1782 if (! IEEE80211_IS_CHAN_HT(c)) {
1783 IEEE80211_NOTE(ni->ni_vap,
1784 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1785 "not HT; skipping VHT check (%u/0x%x)",
1786 c->ic_freq, c->ic_flags);
1787 goto done;
1788 }
1789
1790 /*
1791 * Next step - look at the current VHT flags and determine
1792 * if we need to upgrade. Mask out the VHT and HT flags since
1793 * the vhtflags field will already have the correct HT
1794 * flags to use.
1795 */
1796 if (IEEE80211_CONF_VHT(ic) && ni->ni_vhtcap != 0 && vhtflags != 0) {
1797 chanflags = (c->ic_flags
1798 &~ (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT))
1799 | vhtflags;
1800 IEEE80211_NOTE(ni->ni_vap,
1801 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1802 ni,
1803 "%s: VHT; chanwidth=0x%02x; vhtflags=0x%08x",
1804 __func__, ni->ni_vht_chanwidth, vhtflags);
1805
1806 IEEE80211_NOTE(ni->ni_vap,
1807 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1808 ni,
1809 "%s: VHT; trying lookup for %d/0x%08x",
1810 __func__, c->ic_freq, chanflags);
1811 c = ieee80211_find_channel(ic, c->ic_freq, chanflags);
1812 }
1813
1814 /* Finally, if it's changed */
1815 if (c != NULL && c != ni->ni_chan) {
1816 IEEE80211_NOTE(ni->ni_vap,
1817 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1818 "switch station to %s%d channel %u/0x%x",
1819 IEEE80211_IS_CHAN_VHT(c) ? "VHT" : "HT",
1820 IEEE80211_IS_CHAN_VHT80(c) ? 80 :
1821 (IEEE80211_IS_CHAN_HT40(c) ? 40 : 20),
1822 c->ic_freq, c->ic_flags);
1823 ni->ni_chan = c;
1824 ret = 1;
1825 }
1826 /* NB: caller responsible for forcing any channel change */
1827
1828 done:
1829 /* update node's (11n) tx channel width */
1830 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
1831 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
1832 return (ret);
1833 }
1834
1835 /*
1836 * Update 11n MIMO PS state according to received htcap.
1837 */
1838 static __inline int
htcap_update_mimo_ps(struct ieee80211_node * ni)1839 htcap_update_mimo_ps(struct ieee80211_node *ni)
1840 {
1841 uint16_t oflags = ni->ni_flags;
1842
1843 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1844 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1845 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1846 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1847 break;
1848 case IEEE80211_HTCAP_SMPS_ENA:
1849 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1850 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1851 break;
1852 case IEEE80211_HTCAP_SMPS_OFF:
1853 default: /* disable on rx of reserved value */
1854 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1855 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1856 break;
1857 }
1858 return (oflags ^ ni->ni_flags);
1859 }
1860
1861 /*
1862 * Update short GI state according to received htcap
1863 * and local settings.
1864 */
1865 static __inline void
htcap_update_shortgi(struct ieee80211_node * ni)1866 htcap_update_shortgi(struct ieee80211_node *ni)
1867 {
1868 struct ieee80211vap *vap = ni->ni_vap;
1869
1870 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1871 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1872 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1873 ni->ni_flags |= IEEE80211_NODE_SGI20;
1874 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1875 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1876 ni->ni_flags |= IEEE80211_NODE_SGI40;
1877 }
1878
1879 /*
1880 * Update LDPC state according to received htcap
1881 * and local settings.
1882 */
1883 static __inline void
htcap_update_ldpc(struct ieee80211_node * ni)1884 htcap_update_ldpc(struct ieee80211_node *ni)
1885 {
1886 struct ieee80211vap *vap = ni->ni_vap;
1887
1888 if ((ni->ni_htcap & IEEE80211_HTCAP_LDPC) &&
1889 (vap->iv_flags_ht & IEEE80211_FHT_LDPC_TX))
1890 ni->ni_flags |= IEEE80211_NODE_LDPC;
1891 }
1892
1893 /*
1894 * Parse and update HT-related state extracted from
1895 * the HT cap and info ie's.
1896 *
1897 * This is called from the STA management path and
1898 * the ieee80211_node_join() path. It will take into
1899 * account the IEs discovered during scanning and
1900 * adjust things accordingly.
1901 */
1902 void
ieee80211_ht_updateparams(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)1903 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1904 const uint8_t *htcapie, const uint8_t *htinfoie)
1905 {
1906 struct ieee80211vap *vap = ni->ni_vap;
1907 const struct ieee80211_ie_htinfo *htinfo;
1908
1909 ieee80211_parse_htcap(ni, htcapie);
1910 if (vap->iv_htcaps & IEEE80211_HTC_SMPS)
1911 htcap_update_mimo_ps(ni);
1912 htcap_update_shortgi(ni);
1913 htcap_update_ldpc(ni);
1914
1915 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1916 htinfoie += 4;
1917 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1918 htinfo_parse(ni, htinfo);
1919
1920 /*
1921 * Defer the node channel change; we need to now
1922 * update VHT parameters before we do it.
1923 */
1924
1925 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1926 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1927 ni->ni_flags |= IEEE80211_NODE_RIFS;
1928 else
1929 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1930 }
1931
1932 static uint32_t
ieee80211_vht_get_vhtflags(struct ieee80211_node * ni,uint32_t htflags)1933 ieee80211_vht_get_vhtflags(struct ieee80211_node *ni, uint32_t htflags)
1934 {
1935 struct ieee80211vap *vap = ni->ni_vap;
1936 uint32_t vhtflags = 0;
1937
1938 vhtflags = 0;
1939 if (ni->ni_flags & IEEE80211_NODE_VHT && vap->iv_vht_flags & IEEE80211_FVHT_VHT) {
1940 if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_160MHZ) &&
1941 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(vap->iv_vht_cap.vht_cap_info) &&
1942 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT160)) {
1943 vhtflags = IEEE80211_CHAN_VHT160;
1944 /* Mirror the HT40 flags */
1945 if (htflags == IEEE80211_CHAN_HT40U) {
1946 vhtflags |= IEEE80211_CHAN_HT40U;
1947 } else if (htflags == IEEE80211_CHAN_HT40D) {
1948 vhtflags |= IEEE80211_CHAN_HT40D;
1949 }
1950 } else if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_80P80MHZ) &&
1951 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(vap->iv_vht_cap.vht_cap_info) &&
1952 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT80P80)) {
1953 vhtflags = IEEE80211_CHAN_VHT80P80;
1954 /* Mirror the HT40 flags */
1955 if (htflags == IEEE80211_CHAN_HT40U) {
1956 vhtflags |= IEEE80211_CHAN_HT40U;
1957 } else if (htflags == IEEE80211_CHAN_HT40D) {
1958 vhtflags |= IEEE80211_CHAN_HT40D;
1959 }
1960 } else if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_80MHZ) &&
1961 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT80)) {
1962 vhtflags = IEEE80211_CHAN_VHT80;
1963 /* Mirror the HT40 flags */
1964 if (htflags == IEEE80211_CHAN_HT40U) {
1965 vhtflags |= IEEE80211_CHAN_HT40U;
1966 } else if (htflags == IEEE80211_CHAN_HT40D) {
1967 vhtflags |= IEEE80211_CHAN_HT40D;
1968 }
1969 } else if (ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_USE_HT) {
1970 /* Mirror the HT40 flags */
1971 /*
1972 * XXX TODO: if ht40 is disabled, but vht40 isn't
1973 * disabled then this logic will get very, very sad.
1974 * It's quite possible the only sane thing to do is
1975 * to not have vht40 as an option, and just obey
1976 * 'ht40' as that flag.
1977 */
1978 if ((htflags == IEEE80211_CHAN_HT40U) &&
1979 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT40)) {
1980 vhtflags = IEEE80211_CHAN_VHT40U
1981 | IEEE80211_CHAN_HT40U;
1982 } else if (htflags == IEEE80211_CHAN_HT40D &&
1983 (vap->iv_vht_flags & IEEE80211_FVHT_USEVHT40)) {
1984 vhtflags = IEEE80211_CHAN_VHT40D
1985 | IEEE80211_CHAN_HT40D;
1986 } else if (htflags == IEEE80211_CHAN_HT20) {
1987 vhtflags = IEEE80211_CHAN_VHT20
1988 | IEEE80211_CHAN_HT20;
1989 }
1990 } else {
1991 vhtflags = IEEE80211_CHAN_VHT20;
1992 }
1993 }
1994 return (vhtflags);
1995 }
1996
1997 /*
1998 * Final part of updating the HT parameters.
1999 *
2000 * This is called from the STA management path and
2001 * the ieee80211_node_join() path. It will take into
2002 * account the IEs discovered during scanning and
2003 * adjust things accordingly.
2004 *
2005 * This is done after a call to ieee80211_ht_updateparams()
2006 * because it (and the upcoming VHT version of updateparams)
2007 * needs to ensure everything is parsed before htinfo_update_chw()
2008 * is called - which will change the channel config for the
2009 * node for us.
2010 */
2011 int
ieee80211_ht_updateparams_final(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)2012 ieee80211_ht_updateparams_final(struct ieee80211_node *ni,
2013 const uint8_t *htcapie, const uint8_t *htinfoie)
2014 {
2015 struct ieee80211vap *vap = ni->ni_vap;
2016 const struct ieee80211_ie_htinfo *htinfo;
2017 int htflags, vhtflags;
2018 int ret = 0;
2019
2020 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
2021
2022 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
2023 IEEE80211_CHAN_HT20 : 0;
2024
2025 /* NB: honor operating mode constraint */
2026 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
2027 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
2028 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
2029 htflags = IEEE80211_CHAN_HT40U;
2030 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
2031 htflags = IEEE80211_CHAN_HT40D;
2032 }
2033
2034 /*
2035 * VHT flags - do much the same; check whether VHT is available
2036 * and if so, what our ideal channel use would be based on our
2037 * capabilities and the (pre-parsed) VHT info IE.
2038 */
2039 vhtflags = ieee80211_vht_get_vhtflags(ni, htflags);
2040
2041 if (htinfo_update_chw(ni, htflags, vhtflags))
2042 ret = 1;
2043
2044 return (ret);
2045 }
2046
2047 /*
2048 * Parse and update HT-related state extracted from the HT cap ie
2049 * for a station joining an HT BSS.
2050 *
2051 * This is called from the hostap path for each station.
2052 */
2053 void
ieee80211_ht_updatehtcap(struct ieee80211_node * ni,const uint8_t * htcapie)2054 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
2055 {
2056 struct ieee80211vap *vap = ni->ni_vap;
2057
2058 ieee80211_parse_htcap(ni, htcapie);
2059 if (vap->iv_htcaps & IEEE80211_HTC_SMPS)
2060 htcap_update_mimo_ps(ni);
2061 htcap_update_shortgi(ni);
2062 htcap_update_ldpc(ni);
2063 }
2064
2065 /*
2066 * Called once HT and VHT capabilities are parsed in hostap mode -
2067 * this will adjust the channel configuration of the given node
2068 * based on the configuration and capabilities.
2069 */
2070 void
ieee80211_ht_updatehtcap_final(struct ieee80211_node * ni)2071 ieee80211_ht_updatehtcap_final(struct ieee80211_node *ni)
2072 {
2073 struct ieee80211vap *vap = ni->ni_vap;
2074 int htflags;
2075 int vhtflags;
2076
2077 /* NB: honor operating mode constraint */
2078 /* XXX 40 MHz intolerant */
2079 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
2080 IEEE80211_CHAN_HT20 : 0;
2081 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
2082 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
2083 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
2084 htflags = IEEE80211_CHAN_HT40U;
2085 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
2086 htflags = IEEE80211_CHAN_HT40D;
2087 }
2088 /*
2089 * VHT flags - do much the same; check whether VHT is available
2090 * and if so, what our ideal channel use would be based on our
2091 * capabilities and the (pre-parsed) VHT info IE.
2092 */
2093 vhtflags = ieee80211_vht_get_vhtflags(ni, htflags);
2094
2095 (void) htinfo_update_chw(ni, htflags, vhtflags);
2096 }
2097
2098 /*
2099 * Install received HT rate set by parsing the HT cap ie.
2100 */
2101 int
ieee80211_setup_htrates(struct ieee80211_node * ni,const uint8_t * ie,int flags)2102 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
2103 {
2104 struct ieee80211com *ic = ni->ni_ic;
2105 struct ieee80211vap *vap = ni->ni_vap;
2106 const struct ieee80211_ie_htcap *htcap;
2107 struct ieee80211_htrateset *rs;
2108 int i, maxequalmcs, maxunequalmcs;
2109
2110 maxequalmcs = ic->ic_txstream * 8 - 1;
2111 maxunequalmcs = 0;
2112 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
2113 if (ic->ic_txstream >= 2)
2114 maxunequalmcs = 38;
2115 if (ic->ic_txstream >= 3)
2116 maxunequalmcs = 52;
2117 if (ic->ic_txstream >= 4)
2118 maxunequalmcs = 76;
2119 }
2120
2121 rs = &ni->ni_htrates;
2122 memset(rs, 0, sizeof(*rs));
2123 if (ie != NULL) {
2124 if (ie[0] == IEEE80211_ELEMID_VENDOR)
2125 ie += 4;
2126 htcap = (const struct ieee80211_ie_htcap *) ie;
2127 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
2128 if (isclr(htcap->hc_mcsset, i))
2129 continue;
2130 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
2131 IEEE80211_NOTE(vap,
2132 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
2133 "WARNING, HT rate set too large; only "
2134 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
2135 vap->iv_stats.is_rx_rstoobig++;
2136 break;
2137 }
2138 if (i <= 31 && i > maxequalmcs)
2139 continue;
2140 if (i == 32 &&
2141 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
2142 continue;
2143 if (i > 32 && i > maxunequalmcs)
2144 continue;
2145 rs->rs_rates[rs->rs_nrates++] = i;
2146 }
2147 }
2148 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
2149 }
2150
2151 /*
2152 * Mark rates in a node's HT rate set as basic according
2153 * to the information in the supplied HT info ie.
2154 */
2155 void
ieee80211_setup_basic_htrates(struct ieee80211_node * ni,const uint8_t * ie)2156 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
2157 {
2158 const struct ieee80211_ie_htinfo *htinfo;
2159 struct ieee80211_htrateset *rs;
2160 int i, j;
2161
2162 if (ie[0] == IEEE80211_ELEMID_VENDOR)
2163 ie += 4;
2164 htinfo = (const struct ieee80211_ie_htinfo *) ie;
2165 rs = &ni->ni_htrates;
2166 if (rs->rs_nrates == 0) {
2167 IEEE80211_NOTE(ni->ni_vap,
2168 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
2169 "%s", "WARNING, empty HT rate set");
2170 return;
2171 }
2172 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
2173 if (isclr(htinfo->hi_basicmcsset, i))
2174 continue;
2175 for (j = 0; j < rs->rs_nrates; j++)
2176 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
2177 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
2178 }
2179 }
2180
2181 static void
ampdu_tx_setup(struct ieee80211_tx_ampdu * tap)2182 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
2183 {
2184 callout_init(&tap->txa_timer, 1);
2185 tap->txa_flags |= IEEE80211_AGGR_SETUP;
2186 tap->txa_lastsample = ticks;
2187 }
2188
2189 static void
ampdu_tx_stop(struct ieee80211_tx_ampdu * tap)2190 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
2191 {
2192 struct ieee80211_node *ni = tap->txa_ni;
2193 struct ieee80211com *ic = ni->ni_ic;
2194
2195 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2196 tap->txa_ni,
2197 "%s: called",
2198 __func__);
2199
2200 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
2201 ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
2202 TID_TO_WME_AC(tap->txa_tid)));
2203
2204 /*
2205 * Stop BA stream if setup so driver has a chance
2206 * to reclaim any resources it might have allocated.
2207 */
2208 ic->ic_addba_stop(ni, tap);
2209 /*
2210 * Stop any pending BAR transmit.
2211 */
2212 bar_stop_timer(tap);
2213
2214 /*
2215 * Reset packet estimate.
2216 */
2217 ieee80211_txampdu_init_pps(tap);
2218
2219 /* NB: clearing NAK means we may re-send ADDBA */
2220 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
2221 }
2222
2223 /*
2224 * ADDBA response timeout.
2225 *
2226 * If software aggregation and per-TID queue management was done here,
2227 * that queue would be unpaused after the ADDBA timeout occurs.
2228 */
2229 static void
addba_timeout(void * arg)2230 addba_timeout(void *arg)
2231 {
2232 struct ieee80211_tx_ampdu *tap = arg;
2233 struct ieee80211_node *ni = tap->txa_ni;
2234 struct ieee80211com *ic = ni->ni_ic;
2235
2236 /* XXX ? */
2237 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
2238 tap->txa_attempts++;
2239 ic->ic_addba_response_timeout(ni, tap);
2240 }
2241
2242 static void
addba_start_timeout(struct ieee80211_tx_ampdu * tap)2243 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
2244 {
2245 /* XXX use CALLOUT_PENDING instead? */
2246 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
2247 addba_timeout, tap);
2248 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
2249 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
2250 }
2251
2252 static void
addba_stop_timeout(struct ieee80211_tx_ampdu * tap)2253 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
2254 {
2255 /* XXX use CALLOUT_PENDING instead? */
2256 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
2257 callout_stop(&tap->txa_timer);
2258 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
2259 }
2260 }
2261
2262 static void
null_addba_response_timeout(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2263 null_addba_response_timeout(struct ieee80211_node *ni,
2264 struct ieee80211_tx_ampdu *tap)
2265 {
2266 }
2267
2268 /*
2269 * Default method for requesting A-MPDU tx aggregation.
2270 * We setup the specified state block and start a timer
2271 * to wait for an ADDBA response frame.
2272 */
2273 static int
ieee80211_addba_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int dialogtoken,int baparamset,int batimeout)2274 ieee80211_addba_request(struct ieee80211_node *ni,
2275 struct ieee80211_tx_ampdu *tap,
2276 int dialogtoken, int baparamset, int batimeout)
2277 {
2278 int bufsiz;
2279
2280 /* XXX locking */
2281 tap->txa_token = dialogtoken;
2282 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
2283 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2284 tap->txa_wnd = (bufsiz == 0) ?
2285 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
2286 addba_start_timeout(tap);
2287 return 1;
2288 }
2289
2290 /*
2291 * Called by drivers that wish to request an ADDBA session be
2292 * setup. This brings it up and starts the request timer.
2293 */
2294 int
ieee80211_ampdu_tx_request_ext(struct ieee80211_node * ni,int tid)2295 ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid)
2296 {
2297 struct ieee80211_tx_ampdu *tap;
2298
2299 if (tid < 0 || tid > 15)
2300 return (0);
2301 tap = &ni->ni_tx_ampdu[tid];
2302
2303 /* XXX locking */
2304 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2305 /* do deferred setup of state */
2306 ampdu_tx_setup(tap);
2307 }
2308 /* XXX hack for not doing proper locking */
2309 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2310 addba_start_timeout(tap);
2311 return (1);
2312 }
2313
2314 /*
2315 * Called by drivers that have marked a session as active.
2316 */
2317 int
ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node * ni,int tid,int status)2318 ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni, int tid,
2319 int status)
2320 {
2321 struct ieee80211_tx_ampdu *tap;
2322
2323 if (tid < 0 || tid > 15)
2324 return (0);
2325 tap = &ni->ni_tx_ampdu[tid];
2326
2327 /* XXX locking */
2328 addba_stop_timeout(tap);
2329 if (status == 1) {
2330 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
2331 tap->txa_attempts = 0;
2332 } else {
2333 /* mark tid so we don't try again */
2334 tap->txa_flags |= IEEE80211_AGGR_NAK;
2335 }
2336 return (1);
2337 }
2338
2339 /*
2340 * Default method for processing an A-MPDU tx aggregation
2341 * response. We shutdown any pending timer and update the
2342 * state block according to the reply.
2343 */
2344 static int
ieee80211_addba_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status,int baparamset,int batimeout)2345 ieee80211_addba_response(struct ieee80211_node *ni,
2346 struct ieee80211_tx_ampdu *tap,
2347 int status, int baparamset, int batimeout)
2348 {
2349 struct ieee80211vap *vap = ni->ni_vap;
2350 int bufsiz;
2351
2352 /* XXX locking */
2353 addba_stop_timeout(tap);
2354 if (status == IEEE80211_STATUS_SUCCESS) {
2355 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2356 /* XXX override our request? */
2357 tap->txa_wnd = (bufsiz == 0) ?
2358 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
2359 #ifdef __notyet__
2360 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2361 #endif
2362 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
2363 tap->txa_attempts = 0;
2364 /* TODO: this should be a vap flag */
2365 if ((vap->iv_htcaps & IEEE80211_HTC_TX_AMSDU_AMPDU) &&
2366 (ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
2367 (_IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU)))
2368 tap->txa_flags |= IEEE80211_AGGR_AMSDU;
2369 else
2370 tap->txa_flags &= ~IEEE80211_AGGR_AMSDU;
2371 } else {
2372 /* mark tid so we don't try again */
2373 tap->txa_flags |= IEEE80211_AGGR_NAK;
2374 }
2375 return 1;
2376 }
2377
2378 /*
2379 * Default method for stopping A-MPDU tx aggregation.
2380 * Any timer is cleared and we drain any pending frames.
2381 */
2382 static void
ieee80211_addba_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2383 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
2384 {
2385 /* XXX locking */
2386 addba_stop_timeout(tap);
2387 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
2388 /* XXX clear aggregation queue */
2389 tap->txa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_AMSDU);
2390 }
2391 tap->txa_attempts = 0;
2392 }
2393
2394 /*
2395 * Process a received action frame using the default aggregation
2396 * policy. We intercept ADDBA-related frames and use them to
2397 * update our aggregation state. All other frames are passed up
2398 * for processing by ieee80211_recv_action.
2399 */
2400 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)2401 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
2402 const struct ieee80211_frame *wh,
2403 const uint8_t *frm, const uint8_t *efrm)
2404 {
2405 struct ieee80211com *ic = ni->ni_ic;
2406 struct ieee80211vap *vap = ni->ni_vap;
2407 struct ieee80211_rx_ampdu *rap;
2408 uint8_t dialogtoken;
2409 uint16_t baparamset, batimeout, baseqctl;
2410 uint16_t args[5];
2411 int tid;
2412
2413 dialogtoken = frm[2];
2414 baparamset = le16dec(frm+3);
2415 batimeout = le16dec(frm+5);
2416 baseqctl = le16dec(frm+7);
2417
2418 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2419
2420 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2421 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
2422 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d amsdu %d",
2423 dialogtoken, baparamset,
2424 tid, _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ),
2425 batimeout,
2426 _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_START),
2427 _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_FRAG),
2428 _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU));
2429
2430 rap = &ni->ni_rx_ampdu[tid];
2431
2432 /* Send ADDBA response */
2433 args[0] = dialogtoken;
2434 /*
2435 * NB: We ack only if the sta associated with HT and
2436 * the ap is configured to do AMPDU rx (the latter
2437 * violates the 11n spec and is mostly for testing).
2438 */
2439 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
2440 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
2441 /* XXX TODO: handle ampdu_rx_start failure */
2442 ic->ic_ampdu_rx_start(ni, rap,
2443 baparamset, batimeout, baseqctl);
2444
2445 args[1] = IEEE80211_STATUS_SUCCESS;
2446 } else {
2447 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2448 ni, "reject ADDBA request: %s",
2449 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
2450 "administratively disabled" :
2451 "not negotiated for station");
2452 vap->iv_stats.is_addba_reject++;
2453 args[1] = IEEE80211_STATUS_UNSPECIFIED;
2454 }
2455 /* XXX honor rap flags? */
2456 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2457 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAPS_TID)
2458 | _IEEE80211_SHIFTMASK(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
2459 ;
2460
2461 /*
2462 * TODO: we're out of iv_flags_ht fields; once
2463 * this is extended we should make this configurable.
2464 */
2465 if ((baparamset & IEEE80211_BAPS_AMSDU) &&
2466 (ni->ni_flags & IEEE80211_NODE_AMSDU_RX) &&
2467 (vap->iv_htcaps & IEEE80211_HTC_RX_AMSDU_AMPDU))
2468 args[2] |= IEEE80211_BAPS_AMSDU;
2469
2470 args[3] = 0;
2471 args[4] = 0;
2472 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2473 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
2474 return 0;
2475 }
2476
2477 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)2478 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
2479 const struct ieee80211_frame *wh,
2480 const uint8_t *frm, const uint8_t *efrm)
2481 {
2482 struct ieee80211com *ic = ni->ni_ic;
2483 struct ieee80211vap *vap = ni->ni_vap;
2484 struct ieee80211_tx_ampdu *tap;
2485 uint8_t dialogtoken, policy;
2486 uint16_t baparamset, batimeout, code;
2487 int tid;
2488 #ifdef IEEE80211_DEBUG
2489 int amsdu, bufsiz;
2490 #endif
2491
2492 dialogtoken = frm[2];
2493 code = le16dec(frm+3);
2494 baparamset = le16dec(frm+5);
2495 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2496 #ifdef IEEE80211_DEBUG
2497 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2498 amsdu = !! _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU);
2499 #endif
2500 policy = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_POLICY);
2501 batimeout = le16dec(frm+7);
2502
2503 tap = &ni->ni_tx_ampdu[tid];
2504 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
2505 IEEE80211_DISCARD_MAC(vap,
2506 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2507 ni->ni_macaddr, "ADDBA response",
2508 "no pending ADDBA, tid %d dialogtoken %u "
2509 "code %d", tid, dialogtoken, code);
2510 vap->iv_stats.is_addba_norequest++;
2511 return 0;
2512 }
2513 if (dialogtoken != tap->txa_token) {
2514 IEEE80211_DISCARD_MAC(vap,
2515 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2516 ni->ni_macaddr, "ADDBA response",
2517 "dialogtoken mismatch: waiting for %d, "
2518 "received %d, tid %d code %d",
2519 tap->txa_token, dialogtoken, tid, code);
2520 vap->iv_stats.is_addba_badtoken++;
2521 return 0;
2522 }
2523 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
2524 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
2525 IEEE80211_DISCARD_MAC(vap,
2526 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2527 ni->ni_macaddr, "ADDBA response",
2528 "policy mismatch: expecting %s, "
2529 "received %s, tid %d code %d",
2530 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
2531 policy, tid, code);
2532 vap->iv_stats.is_addba_badpolicy++;
2533 return 0;
2534 }
2535 #if 0
2536 /* XXX we take MIN in ieee80211_addba_response */
2537 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
2538 IEEE80211_DISCARD_MAC(vap,
2539 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2540 ni->ni_macaddr, "ADDBA response",
2541 "BA window too large: max %d, "
2542 "received %d, tid %d code %d",
2543 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
2544 vap->iv_stats.is_addba_badbawinsize++;
2545 return 0;
2546 }
2547 #endif
2548
2549 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2550 "recv ADDBA response: dialogtoken %u code %d "
2551 "baparamset 0x%x (tid %d bufsiz %d amsdu %d) batimeout %d",
2552 dialogtoken, code, baparamset, tid,
2553 bufsiz,
2554 amsdu,
2555 batimeout);
2556 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
2557 return 0;
2558 }
2559
2560 static int
ht_recv_action_ba_delba(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2561 ht_recv_action_ba_delba(struct ieee80211_node *ni,
2562 const struct ieee80211_frame *wh,
2563 const uint8_t *frm, const uint8_t *efrm)
2564 {
2565 struct ieee80211com *ic = ni->ni_ic;
2566 struct ieee80211_rx_ampdu *rap;
2567 struct ieee80211_tx_ampdu *tap;
2568 uint16_t baparamset;
2569 #ifdef IEEE80211_DEBUG
2570 uint16_t code;
2571 #endif
2572 int tid;
2573
2574 baparamset = le16dec(frm+2);
2575 #ifdef IEEE80211_DEBUG
2576 code = le16dec(frm+4);
2577 #endif
2578
2579 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_DELBAPS_TID);
2580
2581 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2582 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
2583 "code %d", baparamset, tid,
2584 _IEEE80211_MASKSHIFT(baparamset, IEEE80211_DELBAPS_INIT), code);
2585
2586 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
2587 tap = &ni->ni_tx_ampdu[tid];
2588 ic->ic_addba_stop(ni, tap);
2589 } else {
2590 rap = &ni->ni_rx_ampdu[tid];
2591 ic->ic_ampdu_rx_stop(ni, rap);
2592 }
2593 return 0;
2594 }
2595
2596 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)2597 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
2598 const struct ieee80211_frame *wh __unused,
2599 const uint8_t *frm, const uint8_t *efrm __unused)
2600 {
2601 int chw;
2602
2603 /* If 20/40 is not supported the chw cannot change. */
2604 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) == 0)
2605 return (0);
2606
2607 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ?
2608 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
2609
2610 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2611 "%s: HT txchwidth, width %d%s (%s)", __func__,
2612 chw, ni->ni_chw != chw ? "*" : "", ieee80211_ni_chw_to_str(chw));
2613 if (chw != ni->ni_chw) {
2614 /* XXX does this need to change the ht40 station count? */
2615 ni->ni_chw = chw;
2616 /* XXX notify on change */
2617 }
2618 return 0;
2619 }
2620
2621 static int
ht_recv_action_ht_mimopwrsave(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2622 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2623 const struct ieee80211_frame *wh,
2624 const uint8_t *frm, const uint8_t *efrm)
2625 {
2626 const struct ieee80211_action_ht_mimopowersave *mps =
2627 (const struct ieee80211_action_ht_mimopowersave *) frm;
2628
2629 /* XXX check iv_htcaps */
2630 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2631 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2632 else
2633 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2634 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2635 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2636 else
2637 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2638 /* XXX notify on change */
2639 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2640 "%s: HT MIMO PS (%s%s)", __func__,
2641 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2642 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2643 );
2644 return 0;
2645 }
2646
2647 /*
2648 * Transmit processing.
2649 */
2650
2651 /*
2652 * Check if A-MPDU should be requested/enabled for a stream.
2653 * We require a traffic rate above a per-AC threshold and we
2654 * also handle backoff from previous failed attempts.
2655 *
2656 * Drivers may override this method to bring in information
2657 * such as link state conditions in making the decision.
2658 */
2659 static int
ieee80211_ampdu_enable(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2660 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2661 struct ieee80211_tx_ampdu *tap)
2662 {
2663 struct ieee80211vap *vap = ni->ni_vap;
2664
2665 if (tap->txa_avgpps <
2666 vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
2667 return 0;
2668 /* XXX check rssi? */
2669 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2670 ieee80211_time_after(ticks, tap->txa_nextrequest)) {
2671 /*
2672 * Don't retry too often; txa_nextrequest is set
2673 * to the minimum interval we'll retry after
2674 * ieee80211_addba_maxtries failed attempts are made.
2675 */
2676 return 0;
2677 }
2678 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2679 "enable AMPDU on tid %d (%s), avgpps %d pkts %d attempt %d",
2680 tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
2681 tap->txa_avgpps, tap->txa_pkts, tap->txa_attempts);
2682 return 1;
2683 }
2684
2685 /*
2686 * Request A-MPDU tx aggregation. Setup local state and
2687 * issue an ADDBA request. BA use will only happen after
2688 * the other end replies with ADDBA response.
2689 */
2690 int
ieee80211_ampdu_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2691 ieee80211_ampdu_request(struct ieee80211_node *ni,
2692 struct ieee80211_tx_ampdu *tap)
2693 {
2694 struct ieee80211com *ic = ni->ni_ic;
2695 uint16_t args[5];
2696 int tid, dialogtoken;
2697 static int tokens = 0; /* XXX */
2698
2699 /* XXX locking */
2700 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2701 /* do deferred setup of state */
2702 ampdu_tx_setup(tap);
2703 }
2704 /* XXX hack for not doing proper locking */
2705 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2706
2707 dialogtoken = (tokens+1) % 63; /* XXX */
2708 tid = tap->txa_tid;
2709
2710 /*
2711 * XXX TODO: This is racy with any other parallel TX going on. :(
2712 */
2713 tap->txa_start = ni->ni_txseqs[tid];
2714
2715 args[0] = dialogtoken;
2716 args[1] = 0; /* NB: status code not used */
2717 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2718 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAPS_TID)
2719 | _IEEE80211_SHIFTMASK(IEEE80211_AGGR_BAWMAX,
2720 IEEE80211_BAPS_BUFSIZ)
2721 ;
2722
2723 /* XXX TODO: this should be a flag, not iv_htcaps */
2724 if ((ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
2725 (ni->ni_vap->iv_htcaps & IEEE80211_HTC_TX_AMSDU_AMPDU))
2726 args[2] |= IEEE80211_BAPS_AMSDU;
2727
2728 args[3] = 0; /* batimeout */
2729 /* NB: do first so there's no race against reply */
2730 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2731 /* unable to setup state, don't make request */
2732 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2733 ni, "%s: could not setup BA stream for TID %d AC %d",
2734 __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
2735 /* defer next try so we don't slam the driver with requests */
2736 tap->txa_attempts = ieee80211_addba_maxtries;
2737 /* NB: check in case driver wants to override */
2738 if (tap->txa_nextrequest <= ticks)
2739 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2740 return 0;
2741 }
2742 tokens = dialogtoken; /* allocate token */
2743 /* NB: after calling ic_addba_request so driver can set txa_start */
2744 args[4] = _IEEE80211_SHIFTMASK(tap->txa_start, IEEE80211_BASEQ_START)
2745 | _IEEE80211_SHIFTMASK(0, IEEE80211_BASEQ_FRAG)
2746 ;
2747 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2748 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2749 }
2750
2751 /*
2752 * Terminate an AMPDU tx stream. State is reclaimed
2753 * and the peer notified with a DelBA Action frame.
2754 */
2755 void
ieee80211_ampdu_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int reason)2756 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2757 int reason)
2758 {
2759 struct ieee80211com *ic = ni->ni_ic;
2760 struct ieee80211vap *vap = ni->ni_vap;
2761 uint16_t args[4];
2762
2763 /* XXX locking */
2764 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2765 if (IEEE80211_AMPDU_RUNNING(tap)) {
2766 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2767 ni, "%s: stop BA stream for TID %d (reason: %d (%s))",
2768 __func__, tap->txa_tid, reason,
2769 ieee80211_reason_to_string(reason));
2770 vap->iv_stats.is_ampdu_stop++;
2771
2772 ic->ic_addba_stop(ni, tap);
2773 args[0] = tap->txa_tid;
2774 args[1] = IEEE80211_DELBAPS_INIT;
2775 args[2] = reason; /* XXX reason code */
2776 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2777 IEEE80211_ACTION_BA_DELBA, args);
2778 } else {
2779 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2780 ni, "%s: BA stream for TID %d not running "
2781 "(reason: %d (%s))", __func__, tap->txa_tid, reason,
2782 ieee80211_reason_to_string(reason));
2783 vap->iv_stats.is_ampdu_stop_failed++;
2784 }
2785 }
2786
2787 /* XXX */
2788 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
2789
2790 static void
bar_timeout(void * arg)2791 bar_timeout(void *arg)
2792 {
2793 struct ieee80211_tx_ampdu *tap = arg;
2794 struct ieee80211_node *ni = tap->txa_ni;
2795
2796 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2797 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2798
2799 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2800 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2801 tap->txa_tid, tap->txa_flags, tap->txa_attempts);
2802
2803 /* guard against race with bar_tx_complete */
2804 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2805 return;
2806 /* XXX ? */
2807 if (tap->txa_attempts >= ieee80211_bar_maxtries) {
2808 struct ieee80211com *ic = ni->ni_ic;
2809
2810 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
2811 /*
2812 * If (at least) the last BAR TX timeout was due to
2813 * an ieee80211_send_bar() failures, then we need
2814 * to make sure we notify the driver that a BAR
2815 * TX did occur and fail. This gives the driver
2816 * a chance to undo any queue pause that may
2817 * have occurred.
2818 */
2819 ic->ic_bar_response(ni, tap, 1);
2820 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2821 } else {
2822 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
2823 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
2824 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2825 ni, "%s: failed to TX, starting timer\n",
2826 __func__);
2827 /*
2828 * If ieee80211_send_bar() fails here, the
2829 * timer may have stopped and/or the pending
2830 * flag may be clear. Because of this,
2831 * fake the BARPEND and reset the timer.
2832 * A retransmission attempt will then occur
2833 * during the next timeout.
2834 */
2835 /* XXX locking */
2836 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2837 bar_start_timer(tap);
2838 }
2839 }
2840 }
2841
2842 static void
bar_start_timer(struct ieee80211_tx_ampdu * tap)2843 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2844 {
2845 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2846 tap->txa_ni,
2847 "%s: called",
2848 __func__);
2849 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2850 }
2851
2852 static void
bar_stop_timer(struct ieee80211_tx_ampdu * tap)2853 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2854 {
2855 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2856 tap->txa_ni,
2857 "%s: called",
2858 __func__);
2859 callout_stop(&tap->txa_timer);
2860 }
2861
2862 static void
bar_tx_complete(struct ieee80211_node * ni,void * arg,int status)2863 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2864 {
2865 struct ieee80211_tx_ampdu *tap = arg;
2866
2867 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2868 ni, "%s: tid %u flags 0x%x pending %d status %d",
2869 __func__, tap->txa_tid, tap->txa_flags,
2870 callout_pending(&tap->txa_timer), status);
2871
2872 ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
2873 /* XXX locking */
2874 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2875 callout_pending(&tap->txa_timer)) {
2876 struct ieee80211com *ic = ni->ni_ic;
2877
2878 if (status == 0) /* ACK'd */
2879 bar_stop_timer(tap);
2880 ic->ic_bar_response(ni, tap, status);
2881 /* NB: just let timer expire so we pace requests */
2882 }
2883 }
2884
2885 static void
ieee80211_bar_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status)2886 ieee80211_bar_response(struct ieee80211_node *ni,
2887 struct ieee80211_tx_ampdu *tap, int status)
2888 {
2889
2890 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2891 tap->txa_ni,
2892 "%s: called",
2893 __func__);
2894 if (status == 0) { /* got ACK */
2895 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2896 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2897 tap->txa_start,
2898 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2899 tap->txa_qframes, tap->txa_seqpending,
2900 tap->txa_tid);
2901
2902 /* NB: timer already stopped in bar_tx_complete */
2903 tap->txa_start = tap->txa_seqpending;
2904 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2905 }
2906 }
2907
2908 /*
2909 * Transmit a BAR frame to the specified node. The
2910 * BAR contents are drawn from the supplied aggregation
2911 * state associated with the node.
2912 *
2913 * NB: we only handle immediate ACK w/ compressed bitmap.
2914 */
2915 int
ieee80211_send_bar(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,ieee80211_seq seq)2916 ieee80211_send_bar(struct ieee80211_node *ni,
2917 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2918 {
2919 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2920 struct ieee80211vap *vap = ni->ni_vap;
2921 struct ieee80211com *ic = ni->ni_ic;
2922 struct ieee80211_frame_bar *bar;
2923 struct mbuf *m;
2924 uint16_t barctl, barseqctl;
2925 uint8_t *frm;
2926 int tid, ret;
2927
2928 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2929 tap->txa_ni,
2930 "%s: called",
2931 __func__);
2932
2933 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2934 /* no ADDBA response, should not happen */
2935 /* XXX stat+msg */
2936 return EINVAL;
2937 }
2938 /* XXX locking */
2939 bar_stop_timer(tap);
2940
2941 ieee80211_ref_node(ni);
2942
2943 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2944 if (m == NULL)
2945 senderr(ENOMEM, is_tx_nobuf);
2946
2947 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2948 m_freem(m);
2949 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2950 /* NOTREACHED */
2951 }
2952
2953 bar = mtod(m, struct ieee80211_frame_bar *);
2954 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2955 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2956 bar->i_fc[1] = 0;
2957 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2958 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2959
2960 tid = tap->txa_tid;
2961 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2962 0 : IEEE80211_BAR_NOACK)
2963 | IEEE80211_BAR_COMP
2964 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAR_TID)
2965 ;
2966 barseqctl = _IEEE80211_SHIFTMASK(seq, IEEE80211_BAR_SEQ_START);
2967 /* NB: known to have proper alignment */
2968 bar->i_ctl = htole16(barctl);
2969 bar->i_seq = htole16(barseqctl);
2970 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2971
2972 M_WME_SETAC(m, WME_AC_VO);
2973
2974 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2975
2976 /* XXX locking */
2977 /* init/bump attempts counter */
2978 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2979 tap->txa_attempts = 1;
2980 else
2981 tap->txa_attempts++;
2982 tap->txa_seqpending = seq;
2983 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2984
2985 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2986 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2987 tid, barctl, seq, tap->txa_attempts);
2988
2989 /*
2990 * ic_raw_xmit will free the node reference
2991 * regardless of queue/TX success or failure.
2992 */
2993 IEEE80211_TX_LOCK(ic);
2994 ret = ieee80211_raw_output(vap, ni, m, NULL);
2995 IEEE80211_TX_UNLOCK(ic);
2996 if (ret != 0) {
2997 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2998 ni, "send BAR: failed: (ret = %d)\n",
2999 ret);
3000 /* xmit failed, clear state flag */
3001 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
3002 vap->iv_stats.is_ampdu_bar_tx_fail++;
3003 return ret;
3004 }
3005 /* XXX hack against tx complete happening before timer is started */
3006 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
3007 bar_start_timer(tap);
3008 return 0;
3009 bad:
3010 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
3011 tap->txa_ni,
3012 "%s: bad! ret=%d",
3013 __func__, ret);
3014 vap->iv_stats.is_ampdu_bar_tx_fail++;
3015 ieee80211_free_node(ni);
3016 return ret;
3017 #undef senderr
3018 }
3019
3020 static int
ht_action_output(struct ieee80211_node * ni,struct mbuf * m)3021 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
3022 {
3023 struct ieee80211_bpf_params params;
3024
3025 memset(¶ms, 0, sizeof(params));
3026 params.ibp_pri = WME_AC_VO;
3027 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
3028 /* NB: we know all frames are unicast */
3029 params.ibp_try0 = ni->ni_txparms->maxretry;
3030 params.ibp_power = ni->ni_txpower;
3031 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
3032 ¶ms);
3033 }
3034
3035 #define ADDSHORT(frm, v) do { \
3036 frm[0] = (v) & 0xff; \
3037 frm[1] = (v) >> 8; \
3038 frm += 2; \
3039 } while (0)
3040
3041 /*
3042 * Send an action management frame. The arguments are stuff
3043 * into a frame without inspection; the caller is assumed to
3044 * prepare them carefully (e.g. based on the aggregation state).
3045 */
3046 static int
ht_send_action_ba_addba(struct ieee80211_node * ni,int category,int action,void * arg0)3047 ht_send_action_ba_addba(struct ieee80211_node *ni,
3048 int category, int action, void *arg0)
3049 {
3050 struct ieee80211vap *vap = ni->ni_vap;
3051 struct ieee80211com *ic = ni->ni_ic;
3052 uint16_t *args = arg0;
3053 struct mbuf *m;
3054 uint8_t *frm;
3055
3056 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3057 "send ADDBA %s: dialogtoken %d status %d "
3058 "baparamset 0x%x (tid %d amsdu %d) batimeout 0x%x baseqctl 0x%x",
3059 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
3060 "request" : "response", args[0], args[1], args[2],
3061 _IEEE80211_MASKSHIFT(args[2], IEEE80211_BAPS_TID),
3062 _IEEE80211_MASKSHIFT(args[2], IEEE80211_BAPS_AMSDU),
3063 args[3], args[4]);
3064
3065 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3066 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3067 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3068 ieee80211_ref_node(ni);
3069
3070 m = ieee80211_getmgtframe(&frm,
3071 ic->ic_headroom + sizeof(struct ieee80211_frame),
3072 sizeof(uint16_t) /* action+category */
3073 /* XXX may action payload */
3074 + sizeof(struct ieee80211_action_ba_addbaresponse)
3075 );
3076 if (m != NULL) {
3077 *frm++ = category;
3078 *frm++ = action;
3079 *frm++ = args[0]; /* dialog token */
3080 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
3081 ADDSHORT(frm, args[1]); /* status code */
3082 ADDSHORT(frm, args[2]); /* baparamset */
3083 ADDSHORT(frm, args[3]); /* batimeout */
3084 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
3085 ADDSHORT(frm, args[4]); /* baseqctl */
3086 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3087 return ht_action_output(ni, m);
3088 } else {
3089 vap->iv_stats.is_tx_nobuf++;
3090 ieee80211_free_node(ni);
3091 return ENOMEM;
3092 }
3093 }
3094
3095 static int
ht_send_action_ba_delba(struct ieee80211_node * ni,int category,int action,void * arg0)3096 ht_send_action_ba_delba(struct ieee80211_node *ni,
3097 int category, int action, void *arg0)
3098 {
3099 struct ieee80211vap *vap = ni->ni_vap;
3100 struct ieee80211com *ic = ni->ni_ic;
3101 uint16_t *args = arg0;
3102 struct mbuf *m;
3103 uint16_t baparamset;
3104 uint8_t *frm;
3105
3106 baparamset = _IEEE80211_SHIFTMASK(args[0], IEEE80211_DELBAPS_TID)
3107 | args[1]
3108 ;
3109 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3110 "send DELBA action: tid %d, initiator %d reason %d (%s)",
3111 args[0], args[1], args[2], ieee80211_reason_to_string(args[2]));
3112
3113 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3114 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3115 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3116 ieee80211_ref_node(ni);
3117
3118 m = ieee80211_getmgtframe(&frm,
3119 ic->ic_headroom + sizeof(struct ieee80211_frame),
3120 sizeof(uint16_t) /* action+category */
3121 /* XXX may action payload */
3122 + sizeof(struct ieee80211_action_ba_addbaresponse)
3123 );
3124 if (m != NULL) {
3125 *frm++ = category;
3126 *frm++ = action;
3127 ADDSHORT(frm, baparamset);
3128 ADDSHORT(frm, args[2]); /* reason code */
3129 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3130 return ht_action_output(ni, m);
3131 } else {
3132 vap->iv_stats.is_tx_nobuf++;
3133 ieee80211_free_node(ni);
3134 return ENOMEM;
3135 }
3136 }
3137
3138 static int
ht_send_action_ht_txchwidth(struct ieee80211_node * ni,int category,int action,void * arg0)3139 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
3140 int category, int action, void *arg0)
3141 {
3142 struct ieee80211vap *vap = ni->ni_vap;
3143 struct ieee80211com *ic = ni->ni_ic;
3144 struct mbuf *m;
3145 uint8_t *frm;
3146
3147 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3148 "send HT txchwidth: width %d",
3149 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
3150
3151 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3152 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3153 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3154 ieee80211_ref_node(ni);
3155
3156 m = ieee80211_getmgtframe(&frm,
3157 ic->ic_headroom + sizeof(struct ieee80211_frame),
3158 sizeof(uint16_t) /* action+category */
3159 /* XXX may action payload */
3160 + sizeof(struct ieee80211_action_ba_addbaresponse)
3161 );
3162 if (m != NULL) {
3163 *frm++ = category;
3164 *frm++ = action;
3165 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
3166 IEEE80211_A_HT_TXCHWIDTH_2040 :
3167 IEEE80211_A_HT_TXCHWIDTH_20;
3168 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3169 return ht_action_output(ni, m);
3170 } else {
3171 vap->iv_stats.is_tx_nobuf++;
3172 ieee80211_free_node(ni);
3173 return ENOMEM;
3174 }
3175 }
3176 #undef ADDSHORT
3177
3178 /*
3179 * Construct the MCS bit mask for inclusion in an HT capabilities
3180 * information element.
3181 */
3182 static void
ieee80211_set_mcsset(struct ieee80211com * ic,uint8_t * frm)3183 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
3184 {
3185 int i;
3186 uint8_t txparams;
3187
3188 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
3189 ("ic_rxstream %d out of range", ic->ic_rxstream));
3190 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
3191 ("ic_txstream %d out of range", ic->ic_txstream));
3192
3193 for (i = 0; i < ic->ic_rxstream * 8; i++)
3194 setbit(frm, i);
3195 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
3196 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
3197 setbit(frm, 32);
3198 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
3199 if (ic->ic_rxstream >= 2) {
3200 for (i = 33; i <= 38; i++)
3201 setbit(frm, i);
3202 }
3203 if (ic->ic_rxstream >= 3) {
3204 for (i = 39; i <= 52; i++)
3205 setbit(frm, i);
3206 }
3207 if (ic->ic_rxstream >= 4) {
3208 for (i = 53; i <= 76; i++)
3209 setbit(frm, i);
3210 }
3211 }
3212
3213 txparams = 0x1; /* TX MCS set defined */
3214 if (ic->ic_rxstream != ic->ic_txstream) {
3215 txparams |= 0x2; /* TX RX MCS not equal */
3216 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
3217 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
3218 txparams |= 0x16; /* TX unequal modulation sup */
3219 }
3220
3221 frm[12] = txparams;
3222 }
3223
3224 /*
3225 * Add body of an HTCAP information element.
3226 */
3227 static uint8_t *
ieee80211_add_htcap_body(uint8_t * frm,struct ieee80211_node * ni)3228 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
3229 {
3230 #define ADDSHORT(frm, v) do { \
3231 frm[0] = (v) & 0xff; \
3232 frm[1] = (v) >> 8; \
3233 frm += 2; \
3234 } while (0)
3235 struct ieee80211com *ic = ni->ni_ic;
3236 struct ieee80211vap *vap = ni->ni_vap;
3237 uint16_t caps, extcaps;
3238 int rxmax, density;
3239
3240 /* HT capabilities */
3241 caps = vap->iv_htcaps & 0xffff;
3242 /*
3243 * Note channel width depends on whether we are operating as
3244 * a sta or not. When operating as a sta we are generating
3245 * a request based on our desired configuration. Otherwise
3246 * we are operational and the channel attributes identify
3247 * how we've been setup (which might be different if a fixed
3248 * channel is specified).
3249 */
3250 if (vap->iv_opmode == IEEE80211_M_STA) {
3251 /* override 20/40 use based on config */
3252 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
3253 caps |= IEEE80211_HTCAP_CHWIDTH40;
3254 else
3255 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3256
3257 /* Start by using the advertised settings */
3258 rxmax = _IEEE80211_MASKSHIFT(ni->ni_htparam,
3259 IEEE80211_HTCAP_MAXRXAMPDU);
3260 density = _IEEE80211_MASKSHIFT(ni->ni_htparam,
3261 IEEE80211_HTCAP_MPDUDENSITY);
3262
3263 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
3264 "%s: advertised rxmax=%d, density=%d, vap rxmax=%d, density=%d\n",
3265 __func__,
3266 rxmax,
3267 density,
3268 vap->iv_ampdu_rxmax,
3269 vap->iv_ampdu_density);
3270
3271 /* Cap at VAP rxmax */
3272 if (rxmax > vap->iv_ampdu_rxmax)
3273 rxmax = vap->iv_ampdu_rxmax;
3274
3275 /*
3276 * If the VAP ampdu density value greater, use that.
3277 *
3278 * (Larger density value == larger minimum gap between A-MPDU
3279 * subframes.)
3280 */
3281 if (vap->iv_ampdu_density > density)
3282 density = vap->iv_ampdu_density;
3283
3284 /*
3285 * NB: Hardware might support HT40 on some but not all
3286 * channels. We can't determine this earlier because only
3287 * after association the channel is upgraded to HT based
3288 * on the negotiated capabilities.
3289 */
3290 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
3291 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
3292 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
3293 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3294 } else {
3295 /* override 20/40 use based on current channel */
3296 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
3297 caps |= IEEE80211_HTCAP_CHWIDTH40;
3298 else
3299 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3300
3301 /* XXX TODO should it start by using advertised settings? */
3302 rxmax = vap->iv_ampdu_rxmax;
3303 density = vap->iv_ampdu_density;
3304 }
3305
3306 /* adjust short GI based on channel and config */
3307 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
3308 caps &= ~IEEE80211_HTCAP_SHORTGI20;
3309 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
3310 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
3311 caps &= ~IEEE80211_HTCAP_SHORTGI40;
3312
3313 /* adjust STBC based on receive capabilities */
3314 if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
3315 caps &= ~IEEE80211_HTCAP_RXSTBC;
3316
3317 /* adjust LDPC based on receive capabilites */
3318 if ((vap->iv_flags_ht & IEEE80211_FHT_LDPC_RX) == 0)
3319 caps &= ~IEEE80211_HTCAP_LDPC;
3320
3321 ADDSHORT(frm, caps);
3322
3323 /* HT parameters */
3324 *frm = _IEEE80211_SHIFTMASK(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
3325 | _IEEE80211_SHIFTMASK(density, IEEE80211_HTCAP_MPDUDENSITY)
3326 ;
3327 frm++;
3328
3329 /* pre-zero remainder of ie */
3330 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
3331 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
3332
3333 /* supported MCS set */
3334 /*
3335 * XXX: For sta mode the rate set should be restricted based
3336 * on the AP's capabilities, but ni_htrates isn't setup when
3337 * we're called to form an AssocReq frame so for now we're
3338 * restricted to the device capabilities.
3339 */
3340 ieee80211_set_mcsset(ni->ni_ic, frm);
3341
3342 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
3343 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
3344
3345 /* HT extended capabilities */
3346 extcaps = vap->iv_htextcaps & 0xffff;
3347
3348 ADDSHORT(frm, extcaps);
3349
3350 frm += sizeof(struct ieee80211_ie_htcap) -
3351 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
3352
3353 return frm;
3354 #undef ADDSHORT
3355 }
3356
3357 /*
3358 * Add 802.11n HT capabilities information element
3359 */
3360 uint8_t *
ieee80211_add_htcap(uint8_t * frm,struct ieee80211_node * ni)3361 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
3362 {
3363 frm[0] = IEEE80211_ELEMID_HTCAP;
3364 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
3365 return ieee80211_add_htcap_body(frm + 2, ni);
3366 }
3367
3368 /*
3369 * Non-associated probe request - add HT capabilities based on
3370 * the current channel configuration.
3371 */
3372 static uint8_t *
ieee80211_add_htcap_body_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)3373 ieee80211_add_htcap_body_ch(uint8_t *frm, struct ieee80211vap *vap,
3374 struct ieee80211_channel *c)
3375 {
3376 #define ADDSHORT(frm, v) do { \
3377 frm[0] = (v) & 0xff; \
3378 frm[1] = (v) >> 8; \
3379 frm += 2; \
3380 } while (0)
3381 struct ieee80211com *ic = vap->iv_ic;
3382 uint16_t caps, extcaps;
3383 int rxmax, density;
3384
3385 /* HT capabilities */
3386 caps = vap->iv_htcaps & 0xffff;
3387
3388 /*
3389 * We don't use this in STA mode; only in IBSS mode.
3390 * So in IBSS mode we base our HTCAP flags on the
3391 * given channel.
3392 */
3393
3394 /* override 20/40 use based on current channel */
3395 if (IEEE80211_IS_CHAN_HT40(c))
3396 caps |= IEEE80211_HTCAP_CHWIDTH40;
3397 else
3398 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3399
3400 /* Use the currently configured values */
3401 rxmax = vap->iv_ampdu_rxmax;
3402 density = vap->iv_ampdu_density;
3403
3404 /* adjust short GI based on channel and config */
3405 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
3406 caps &= ~IEEE80211_HTCAP_SHORTGI20;
3407 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
3408 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
3409 caps &= ~IEEE80211_HTCAP_SHORTGI40;
3410 ADDSHORT(frm, caps);
3411
3412 /* HT parameters */
3413 *frm = _IEEE80211_SHIFTMASK(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
3414 | _IEEE80211_SHIFTMASK(density, IEEE80211_HTCAP_MPDUDENSITY)
3415 ;
3416 frm++;
3417
3418 /* pre-zero remainder of ie */
3419 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
3420 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
3421
3422 /* supported MCS set */
3423 /*
3424 * XXX: For sta mode the rate set should be restricted based
3425 * on the AP's capabilities, but ni_htrates isn't setup when
3426 * we're called to form an AssocReq frame so for now we're
3427 * restricted to the device capabilities.
3428 */
3429 ieee80211_set_mcsset(ic, frm);
3430
3431 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
3432 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
3433
3434 /* HT extended capabilities */
3435 extcaps = vap->iv_htextcaps & 0xffff;
3436
3437 ADDSHORT(frm, extcaps);
3438
3439 frm += sizeof(struct ieee80211_ie_htcap) -
3440 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
3441
3442 return frm;
3443 #undef ADDSHORT
3444 }
3445
3446 /*
3447 * Add 802.11n HT capabilities information element
3448 */
3449 uint8_t *
ieee80211_add_htcap_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)3450 ieee80211_add_htcap_ch(uint8_t *frm, struct ieee80211vap *vap,
3451 struct ieee80211_channel *c)
3452 {
3453 frm[0] = IEEE80211_ELEMID_HTCAP;
3454 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
3455 return ieee80211_add_htcap_body_ch(frm + 2, vap, c);
3456 }
3457
3458 /*
3459 * Add Broadcom OUI wrapped standard HTCAP ie; this is
3460 * used for compatibility w/ pre-draft implementations.
3461 */
3462 uint8_t *
ieee80211_add_htcap_vendor(uint8_t * frm,struct ieee80211_node * ni)3463 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
3464 {
3465 frm[0] = IEEE80211_ELEMID_VENDOR;
3466 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
3467 frm[2] = (BCM_OUI >> 0) & 0xff;
3468 frm[3] = (BCM_OUI >> 8) & 0xff;
3469 frm[4] = (BCM_OUI >> 16) & 0xff;
3470 frm[5] = BCM_OUI_HTCAP;
3471 return ieee80211_add_htcap_body(frm + 6, ni);
3472 }
3473
3474 /*
3475 * Construct the MCS bit mask of basic rates
3476 * for inclusion in an HT information element.
3477 */
3478 static void
ieee80211_set_basic_htrates(uint8_t * frm,const struct ieee80211_htrateset * rs)3479 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
3480 {
3481 int i;
3482
3483 for (i = 0; i < rs->rs_nrates; i++) {
3484 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
3485 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
3486 r < IEEE80211_HTRATE_MAXSIZE) {
3487 /* NB: this assumes a particular implementation */
3488 setbit(frm, r);
3489 }
3490 }
3491 }
3492
3493 /*
3494 * Update the HTINFO ie for a beacon frame.
3495 */
3496 void
ieee80211_ht_update_beacon(struct ieee80211vap * vap,struct ieee80211_beacon_offsets * bo)3497 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
3498 struct ieee80211_beacon_offsets *bo)
3499 {
3500 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
3501 struct ieee80211_node *ni;
3502 const struct ieee80211_channel *bsschan;
3503 struct ieee80211com *ic = vap->iv_ic;
3504 struct ieee80211_ie_htinfo *ht =
3505 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
3506
3507 ni = ieee80211_ref_node(vap->iv_bss);
3508 bsschan = ni->ni_chan;
3509
3510 /* XXX only update on channel change */
3511 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
3512 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
3513 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
3514 else
3515 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
3516 if (IEEE80211_IS_CHAN_HT40U(bsschan))
3517 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
3518 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
3519 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
3520 else
3521 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
3522 if (IEEE80211_IS_CHAN_HT40(bsschan))
3523 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
3524
3525 /* protection mode */
3526 /*
3527 * XXX TODO: this uses the global flag, not the per-VAP flag.
3528 * Eventually (once the protection modes are done per-channel
3529 * rather than per-VAP) we can flip this over to be per-VAP but
3530 * using the channel protection mode.
3531 */
3532 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
3533
3534 ieee80211_free_node(ni);
3535
3536 /* XXX propagate to vendor ie's */
3537 #undef PROTMODE
3538 }
3539
3540 /*
3541 * Add body of an HTINFO information element.
3542 *
3543 * NB: We don't use struct ieee80211_ie_htinfo because we can
3544 * be called to fillin both a standard ie and a compat ie that
3545 * has a vendor OUI at the front.
3546 */
3547 static uint8_t *
ieee80211_add_htinfo_body(uint8_t * frm,struct ieee80211_node * ni)3548 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
3549 {
3550 struct ieee80211vap *vap = ni->ni_vap;
3551 struct ieee80211com *ic = ni->ni_ic;
3552
3553 /* pre-zero remainder of ie */
3554 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
3555
3556 /* primary/control channel center */
3557 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
3558
3559 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
3560 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
3561 else
3562 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
3563 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
3564 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
3565 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
3566 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
3567 else
3568 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
3569 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
3570 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
3571
3572 /*
3573 * Add current protection mode. Unlike for beacons,
3574 * this will respect the per-VAP flags.
3575 */
3576 frm[1] = vap->iv_curhtprotmode;
3577
3578 frm += 5;
3579
3580 /* basic MCS set */
3581 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
3582 frm += sizeof(struct ieee80211_ie_htinfo) -
3583 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
3584 return frm;
3585 }
3586
3587 /*
3588 * Add 802.11n HT information element.
3589 */
3590 uint8_t *
ieee80211_add_htinfo(uint8_t * frm,struct ieee80211_node * ni)3591 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
3592 {
3593 frm[0] = IEEE80211_ELEMID_HTINFO;
3594 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
3595 return ieee80211_add_htinfo_body(frm + 2, ni);
3596 }
3597
3598 /*
3599 * Add Broadcom OUI wrapped standard HTINFO ie; this is
3600 * used for compatibility w/ pre-draft implementations.
3601 */
3602 uint8_t *
ieee80211_add_htinfo_vendor(uint8_t * frm,struct ieee80211_node * ni)3603 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
3604 {
3605 frm[0] = IEEE80211_ELEMID_VENDOR;
3606 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
3607 frm[2] = (BCM_OUI >> 0) & 0xff;
3608 frm[3] = (BCM_OUI >> 8) & 0xff;
3609 frm[4] = (BCM_OUI >> 16) & 0xff;
3610 frm[5] = BCM_OUI_HTINFO;
3611 return ieee80211_add_htinfo_body(frm + 6, ni);
3612 }
3613