1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD: stable/12/sys/net80211/ieee80211_ht.c 367373 2020-11-05 12:08:04Z bz $");
31 #endif
32
33 /*
34 * IEEE 802.11n protocol support.
35 */
36
37 #include "opt_inet.h"
38 #include "opt_wlan.h"
39
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/systm.h>
44 #include <sys/endian.h>
45
46 #include <sys/socket.h>
47
48 #include <net/if.h>
49 #include <net/if_var.h>
50 #include <net/if_media.h>
51 #include <net/ethernet.h>
52
53 #include <net80211/ieee80211_var.h>
54 #include <net80211/ieee80211_action.h>
55 #include <net80211/ieee80211_input.h>
56
57 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
58 { 13, 14, 27, 30 }, /* MCS 0 */
59 { 26, 29, 54, 60 }, /* MCS 1 */
60 { 39, 43, 81, 90 }, /* MCS 2 */
61 { 52, 58, 108, 120 }, /* MCS 3 */
62 { 78, 87, 162, 180 }, /* MCS 4 */
63 { 104, 116, 216, 240 }, /* MCS 5 */
64 { 117, 130, 243, 270 }, /* MCS 6 */
65 { 130, 144, 270, 300 }, /* MCS 7 */
66 { 26, 29, 54, 60 }, /* MCS 8 */
67 { 52, 58, 108, 120 }, /* MCS 9 */
68 { 78, 87, 162, 180 }, /* MCS 10 */
69 { 104, 116, 216, 240 }, /* MCS 11 */
70 { 156, 173, 324, 360 }, /* MCS 12 */
71 { 208, 231, 432, 480 }, /* MCS 13 */
72 { 234, 260, 486, 540 }, /* MCS 14 */
73 { 260, 289, 540, 600 }, /* MCS 15 */
74 { 39, 43, 81, 90 }, /* MCS 16 */
75 { 78, 87, 162, 180 }, /* MCS 17 */
76 { 117, 130, 243, 270 }, /* MCS 18 */
77 { 156, 173, 324, 360 }, /* MCS 19 */
78 { 234, 260, 486, 540 }, /* MCS 20 */
79 { 312, 347, 648, 720 }, /* MCS 21 */
80 { 351, 390, 729, 810 }, /* MCS 22 */
81 { 390, 433, 810, 900 }, /* MCS 23 */
82 { 52, 58, 108, 120 }, /* MCS 24 */
83 { 104, 116, 216, 240 }, /* MCS 25 */
84 { 156, 173, 324, 360 }, /* MCS 26 */
85 { 208, 231, 432, 480 }, /* MCS 27 */
86 { 312, 347, 648, 720 }, /* MCS 28 */
87 { 416, 462, 864, 960 }, /* MCS 29 */
88 { 468, 520, 972, 1080 }, /* MCS 30 */
89 { 520, 578, 1080, 1200 }, /* MCS 31 */
90 { 0, 0, 12, 13 }, /* MCS 32 */
91 { 78, 87, 162, 180 }, /* MCS 33 */
92 { 104, 116, 216, 240 }, /* MCS 34 */
93 { 130, 144, 270, 300 }, /* MCS 35 */
94 { 117, 130, 243, 270 }, /* MCS 36 */
95 { 156, 173, 324, 360 }, /* MCS 37 */
96 { 195, 217, 405, 450 }, /* MCS 38 */
97 { 104, 116, 216, 240 }, /* MCS 39 */
98 { 130, 144, 270, 300 }, /* MCS 40 */
99 { 130, 144, 270, 300 }, /* MCS 41 */
100 { 156, 173, 324, 360 }, /* MCS 42 */
101 { 182, 202, 378, 420 }, /* MCS 43 */
102 { 182, 202, 378, 420 }, /* MCS 44 */
103 { 208, 231, 432, 480 }, /* MCS 45 */
104 { 156, 173, 324, 360 }, /* MCS 46 */
105 { 195, 217, 405, 450 }, /* MCS 47 */
106 { 195, 217, 405, 450 }, /* MCS 48 */
107 { 234, 260, 486, 540 }, /* MCS 49 */
108 { 273, 303, 567, 630 }, /* MCS 50 */
109 { 273, 303, 567, 630 }, /* MCS 51 */
110 { 312, 347, 648, 720 }, /* MCS 52 */
111 { 130, 144, 270, 300 }, /* MCS 53 */
112 { 156, 173, 324, 360 }, /* MCS 54 */
113 { 182, 202, 378, 420 }, /* MCS 55 */
114 { 156, 173, 324, 360 }, /* MCS 56 */
115 { 182, 202, 378, 420 }, /* MCS 57 */
116 { 208, 231, 432, 480 }, /* MCS 58 */
117 { 234, 260, 486, 540 }, /* MCS 59 */
118 { 208, 231, 432, 480 }, /* MCS 60 */
119 { 234, 260, 486, 540 }, /* MCS 61 */
120 { 260, 289, 540, 600 }, /* MCS 62 */
121 { 260, 289, 540, 600 }, /* MCS 63 */
122 { 286, 318, 594, 660 }, /* MCS 64 */
123 { 195, 217, 405, 450 }, /* MCS 65 */
124 { 234, 260, 486, 540 }, /* MCS 66 */
125 { 273, 303, 567, 630 }, /* MCS 67 */
126 { 234, 260, 486, 540 }, /* MCS 68 */
127 { 273, 303, 567, 630 }, /* MCS 69 */
128 { 312, 347, 648, 720 }, /* MCS 70 */
129 { 351, 390, 729, 810 }, /* MCS 71 */
130 { 312, 347, 648, 720 }, /* MCS 72 */
131 { 351, 390, 729, 810 }, /* MCS 73 */
132 { 390, 433, 810, 900 }, /* MCS 74 */
133 { 390, 433, 810, 900 }, /* MCS 75 */
134 { 429, 477, 891, 990 }, /* MCS 76 */
135 };
136
137 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
138 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
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, CTLTYPE_INT | CTLFLAG_RW,
148 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
149 "ADDBA request timeout (ms)");
150 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
151 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
152 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
153 "ADDBA request backoff (ms)");
154 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
155 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
156 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
157
158 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
159 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
160
161 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
162 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
163 static ieee80211_recv_action_func ht_recv_action_ba_delba;
164 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
165 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
166
167 static ieee80211_send_action_func ht_send_action_ba_addba;
168 static ieee80211_send_action_func ht_send_action_ba_delba;
169 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
170
171 static void
ieee80211_ht_init(void)172 ieee80211_ht_init(void)
173 {
174 /*
175 * Setup HT parameters that depends on the clock frequency.
176 */
177 ieee80211_ampdu_age = msecs_to_ticks(500);
178 ieee80211_addba_timeout = msecs_to_ticks(250);
179 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
180 ieee80211_bar_timeout = msecs_to_ticks(250);
181 /*
182 * Register action frame handlers.
183 */
184 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
185 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
186 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
187 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
188 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
189 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
190 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
191 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
192 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
193 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
194
195 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
196 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
197 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
198 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
199 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
200 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
201 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
202 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
203 }
204 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
205
206 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
207 struct ieee80211_tx_ampdu *tap);
208 static int ieee80211_addba_request(struct ieee80211_node *ni,
209 struct ieee80211_tx_ampdu *tap,
210 int dialogtoken, int baparamset, int batimeout);
211 static int ieee80211_addba_response(struct ieee80211_node *ni,
212 struct ieee80211_tx_ampdu *tap,
213 int code, int baparamset, int batimeout);
214 static void ieee80211_addba_stop(struct ieee80211_node *ni,
215 struct ieee80211_tx_ampdu *tap);
216 static void null_addba_response_timeout(struct ieee80211_node *ni,
217 struct ieee80211_tx_ampdu *tap);
218
219 static void ieee80211_bar_response(struct ieee80211_node *ni,
220 struct ieee80211_tx_ampdu *tap, int status);
221 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
222 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
223 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
224 int baparamset, int batimeout, int baseqctl);
225 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
226
227 void
ieee80211_ht_attach(struct ieee80211com * ic)228 ieee80211_ht_attach(struct ieee80211com *ic)
229 {
230 /* setup default aggregation policy */
231 ic->ic_recv_action = ieee80211_recv_action;
232 ic->ic_send_action = ieee80211_send_action;
233 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
234 ic->ic_addba_request = ieee80211_addba_request;
235 ic->ic_addba_response = ieee80211_addba_response;
236 ic->ic_addba_response_timeout = null_addba_response_timeout;
237 ic->ic_addba_stop = ieee80211_addba_stop;
238 ic->ic_bar_response = ieee80211_bar_response;
239 ic->ic_ampdu_rx_start = ampdu_rx_start;
240 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
241
242 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
243 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
244 }
245
246 void
ieee80211_ht_detach(struct ieee80211com * ic)247 ieee80211_ht_detach(struct ieee80211com *ic)
248 {
249 }
250
251 void
ieee80211_ht_vattach(struct ieee80211vap * vap)252 ieee80211_ht_vattach(struct ieee80211vap *vap)
253 {
254
255 /* driver can override defaults */
256 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
257 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
258 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
259 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
260 /* tx aggregation traffic thresholds */
261 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
262 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
263 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
264 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
265
266 vap->iv_htprotmode = IEEE80211_PROT_RTSCTS;
267 vap->iv_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
268
269 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
270 /*
271 * Device is HT capable; enable all HT-related
272 * facilities by default.
273 * XXX these choices may be too aggressive.
274 */
275 vap->iv_flags_ht |= IEEE80211_FHT_HT
276 | IEEE80211_FHT_HTCOMPAT
277 ;
278 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
279 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
280 /* XXX infer from channel list? */
281 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
282 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
283 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
284 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
285 }
286 /* enable RIFS if capable */
287 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
288 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
289
290 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
291 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
292 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
293 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
294 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
295 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
296 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
297
298 if (vap->iv_htcaps & IEEE80211_HTCAP_TXSTBC)
299 vap->iv_flags_ht |= IEEE80211_FHT_STBC_TX;
300 if (vap->iv_htcaps & IEEE80211_HTCAP_RXSTBC)
301 vap->iv_flags_ht |= IEEE80211_FHT_STBC_RX;
302
303 if (vap->iv_htcaps & IEEE80211_HTCAP_LDPC)
304 vap->iv_flags_ht |= IEEE80211_FHT_LDPC_RX;
305 if (vap->iv_htcaps & IEEE80211_HTC_TXLDPC)
306 vap->iv_flags_ht |= IEEE80211_FHT_LDPC_TX;
307 }
308 /* NB: disable default legacy WDS, too many issues right now */
309 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
310 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
311 }
312
313 void
ieee80211_ht_vdetach(struct ieee80211vap * vap)314 ieee80211_ht_vdetach(struct ieee80211vap *vap)
315 {
316 }
317
318 static int
ht_getrate(struct ieee80211com * ic,int index,enum ieee80211_phymode mode,int ratetype)319 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
320 int ratetype)
321 {
322 int mword, rate;
323
324 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
325 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
326 return (0);
327 switch (ratetype) {
328 case 0:
329 rate = ieee80211_htrates[index].ht20_rate_800ns;
330 break;
331 case 1:
332 rate = ieee80211_htrates[index].ht20_rate_400ns;
333 break;
334 case 2:
335 rate = ieee80211_htrates[index].ht40_rate_800ns;
336 break;
337 default:
338 rate = ieee80211_htrates[index].ht40_rate_400ns;
339 break;
340 }
341 return (rate);
342 }
343
344 static struct printranges {
345 int minmcs;
346 int maxmcs;
347 int txstream;
348 int ratetype;
349 int htcapflags;
350 } ranges[] = {
351 { 0, 7, 1, 0, 0 },
352 { 8, 15, 2, 0, 0 },
353 { 16, 23, 3, 0, 0 },
354 { 24, 31, 4, 0, 0 },
355 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
356 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
357 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
358 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
359 { 0, 0, 0, 0, 0 },
360 };
361
362 static void
ht_rateprint(struct ieee80211com * ic,enum ieee80211_phymode mode,int ratetype)363 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
364 {
365 int minrate, maxrate;
366 struct printranges *range;
367
368 for (range = ranges; range->txstream != 0; range++) {
369 if (ic->ic_txstream < range->txstream)
370 continue;
371 if (range->htcapflags &&
372 (ic->ic_htcaps & range->htcapflags) == 0)
373 continue;
374 if (ratetype < range->ratetype)
375 continue;
376 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
377 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
378 if (range->maxmcs) {
379 ic_printf(ic, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
380 range->minmcs, range->maxmcs,
381 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
382 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
383 } else {
384 ic_printf(ic, "MCS %d: %d%sMbps\n", range->minmcs,
385 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
386 }
387 }
388 }
389
390 static void
ht_announce(struct ieee80211com * ic,enum ieee80211_phymode mode)391 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
392 {
393 const char *modestr = ieee80211_phymode_name[mode];
394
395 ic_printf(ic, "%s MCS 20MHz\n", modestr);
396 ht_rateprint(ic, mode, 0);
397 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
398 ic_printf(ic, "%s MCS 20MHz SGI\n", modestr);
399 ht_rateprint(ic, mode, 1);
400 }
401 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
402 ic_printf(ic, "%s MCS 40MHz:\n", modestr);
403 ht_rateprint(ic, mode, 2);
404 }
405 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
406 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
407 ic_printf(ic, "%s MCS 40MHz SGI:\n", modestr);
408 ht_rateprint(ic, mode, 3);
409 }
410 }
411
412 void
ieee80211_ht_announce(struct ieee80211com * ic)413 ieee80211_ht_announce(struct ieee80211com *ic)
414 {
415
416 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
417 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
418 ic_printf(ic, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
419 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
420 ht_announce(ic, IEEE80211_MODE_11NA);
421 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
422 ht_announce(ic, IEEE80211_MODE_11NG);
423 }
424
425 void
ieee80211_init_suphtrates(struct ieee80211com * ic)426 ieee80211_init_suphtrates(struct ieee80211com *ic)
427 {
428 #define ADDRATE(x) do { \
429 htrateset->rs_rates[htrateset->rs_nrates] = x; \
430 htrateset->rs_nrates++; \
431 } while (0)
432 struct ieee80211_htrateset *htrateset = &ic->ic_sup_htrates;
433 int i;
434
435 memset(htrateset, 0, sizeof(struct ieee80211_htrateset));
436 for (i = 0; i < ic->ic_txstream * 8; i++)
437 ADDRATE(i);
438 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
439 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
440 ADDRATE(32);
441 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
442 if (ic->ic_txstream >= 2) {
443 for (i = 33; i <= 38; i++)
444 ADDRATE(i);
445 }
446 if (ic->ic_txstream >= 3) {
447 for (i = 39; i <= 52; i++)
448 ADDRATE(i);
449 }
450 if (ic->ic_txstream == 4) {
451 for (i = 53; i <= 76; i++)
452 ADDRATE(i);
453 }
454 }
455 #undef ADDRATE
456 }
457
458 /*
459 * Receive processing.
460 */
461
462 /*
463 * Decap the encapsulated A-MSDU frames and dispatch all but
464 * the last for delivery. The last frame is returned for
465 * delivery via the normal path.
466 */
467 struct mbuf *
ieee80211_decap_amsdu(struct ieee80211_node * ni,struct mbuf * m)468 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
469 {
470 struct ieee80211vap *vap = ni->ni_vap;
471 int framelen;
472 struct mbuf *n;
473
474 /* discard 802.3 header inserted by ieee80211_decap */
475 m_adj(m, sizeof(struct ether_header));
476
477 vap->iv_stats.is_amsdu_decap++;
478
479 for (;;) {
480 /*
481 * Decap the first frame, bust it apart from the
482 * remainder and deliver. We leave the last frame
483 * delivery to the caller (for consistency with other
484 * code paths, could also do it here).
485 */
486 m = ieee80211_decap1(m, &framelen);
487 if (m == NULL) {
488 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
489 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
490 vap->iv_stats.is_amsdu_tooshort++;
491 return NULL;
492 }
493 if (m->m_pkthdr.len == framelen)
494 break;
495 n = m_split(m, framelen, M_NOWAIT);
496 if (n == NULL) {
497 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
498 ni->ni_macaddr, "a-msdu",
499 "%s", "unable to split encapsulated frames");
500 vap->iv_stats.is_amsdu_split++;
501 m_freem(m); /* NB: must reclaim */
502 return NULL;
503 }
504 vap->iv_deliver_data(vap, ni, m);
505
506 /*
507 * Remove frame contents; each intermediate frame
508 * is required to be aligned to a 4-byte boundary.
509 */
510 m = n;
511 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
512 }
513 return m; /* last delivered by caller */
514 }
515
516 static void
ampdu_rx_purge_slot(struct ieee80211_rx_ampdu * rap,int i)517 ampdu_rx_purge_slot(struct ieee80211_rx_ampdu *rap, int i)
518 {
519 struct mbuf *m;
520
521 /* Walk the queue, removing frames as appropriate */
522 while (mbufq_len(&rap->rxa_mq[i]) != 0) {
523 m = mbufq_dequeue(&rap->rxa_mq[i]);
524 if (m == NULL)
525 break;
526 rap->rxa_qbytes -= m->m_pkthdr.len;
527 rap->rxa_qframes--;
528 m_freem(m);
529 }
530 }
531
532 /*
533 * Add the given frame to the current RX reorder slot.
534 *
535 * For future offloaded A-MSDU handling where multiple frames with
536 * the same sequence number show up here, this routine will append
537 * those frames as long as they're appropriately tagged.
538 */
539 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)540 ampdu_rx_add_slot(struct ieee80211_rx_ampdu *rap, int off, int tid,
541 ieee80211_seq rxseq,
542 struct ieee80211_node *ni,
543 struct mbuf *m,
544 const struct ieee80211_rx_stats *rxs)
545 {
546 const struct ieee80211_rx_stats *rxs_final = NULL;
547 struct ieee80211vap *vap = ni->ni_vap;
548 int toss_dup;
549 #define PROCESS 0 /* caller should process frame */
550 #define CONSUMED 1 /* frame consumed, caller does nothing */
551
552 /*
553 * Figure out if this is a duplicate frame for the given slot.
554 *
555 * We're assuming that the driver will hand us all the frames
556 * for a given AMSDU decap pass and if we get /a/ frame
557 * for an AMSDU decap then we'll get all of them.
558 *
559 * The tricksy bit is that we don't know when the /end/ of
560 * the decap pass is, because we aren't tracking state here
561 * per-slot to know that we've finished receiving the frame list.
562 *
563 * The driver sets RX_F_AMSDU and RX_F_AMSDU_MORE to tell us
564 * what's going on; so ideally we'd just check the frame at the
565 * end of the reassembly slot to see if its F_AMSDU w/ no F_AMSDU_MORE -
566 * that means we've received the whole AMSDU decap pass.
567 */
568
569 /*
570 * Get the rxs of the final mbuf in the slot, if one exists.
571 */
572 if (mbufq_len(&rap->rxa_mq[off]) != 0) {
573 rxs_final = ieee80211_get_rx_params_ptr(mbufq_last(&rap->rxa_mq[off]));
574 }
575
576 /* Default to tossing the duplicate frame */
577 toss_dup = 1;
578
579 /*
580 * Check to see if the final frame has F_AMSDU and F_AMSDU set, AND
581 * this frame has F_AMSDU set (MORE or otherwise.) That's a sign
582 * that more can come.
583 */
584
585 if ((rxs != NULL) && (rxs_final != NULL) &&
586 ieee80211_check_rxseq_amsdu(rxs) &&
587 ieee80211_check_rxseq_amsdu(rxs_final)) {
588 if (! ieee80211_check_rxseq_amsdu_more(rxs_final)) {
589 /*
590 * amsdu_more() returning 0 means "it's not the
591 * final frame" so we can append more
592 * frames here.
593 */
594 toss_dup = 0;
595 }
596 }
597
598 /*
599 * If the list is empty OR we have determined we can put more
600 * driver decap'ed AMSDU frames in here, then insert.
601 */
602 if ((mbufq_len(&rap->rxa_mq[off]) == 0) || (toss_dup == 0)) {
603 if (mbufq_enqueue(&rap->rxa_mq[off], m) != 0) {
604 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
605 ni->ni_macaddr,
606 "a-mpdu queue fail",
607 "seqno %u tid %u BA win <%u:%u> off=%d, qlen=%d, maxqlen=%d",
608 rxseq, tid, rap->rxa_start,
609 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
610 off,
611 mbufq_len(&rap->rxa_mq[off]),
612 rap->rxa_mq[off].mq_maxlen);
613 /* XXX error count */
614 m_freem(m);
615 return CONSUMED;
616 }
617 rap->rxa_qframes++;
618 rap->rxa_qbytes += m->m_pkthdr.len;
619 vap->iv_stats.is_ampdu_rx_reorder++;
620 /*
621 * Statistics for AMSDU decap.
622 */
623 if (rxs != NULL && ieee80211_check_rxseq_amsdu(rxs)) {
624 if (ieee80211_check_rxseq_amsdu_more(rxs)) {
625 /* more=1, AMSDU, end of batch */
626 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
627 } else {
628 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
629 }
630 }
631 } else {
632 IEEE80211_DISCARD_MAC(vap,
633 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
634 ni->ni_macaddr, "a-mpdu duplicate",
635 "seqno %u tid %u BA win <%u:%u>",
636 rxseq, tid, rap->rxa_start,
637 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
638 if (rxs != NULL) {
639 IEEE80211_DISCARD_MAC(vap,
640 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
641 ni->ni_macaddr, "a-mpdu duplicate",
642 "seqno %d tid %u pktflags 0x%08x\n",
643 rxseq, tid, rxs->c_pktflags);
644 }
645 if (rxs_final != NULL) {
646 IEEE80211_DISCARD_MAC(vap,
647 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
648 ni->ni_macaddr, "a-mpdu duplicate",
649 "final: pktflags 0x%08x\n",
650 rxs_final->c_pktflags);
651 }
652 vap->iv_stats.is_rx_dup++;
653 IEEE80211_NODE_STAT(ni, rx_dup);
654 m_freem(m);
655 }
656 return CONSUMED;
657 #undef CONSUMED
658 #undef PROCESS
659 }
660
661 /*
662 * Purge all frames in the A-MPDU re-order queue.
663 */
664 static void
ampdu_rx_purge(struct ieee80211_rx_ampdu * rap)665 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
666 {
667 int i;
668
669 for (i = 0; i < rap->rxa_wnd; i++) {
670 ampdu_rx_purge_slot(rap, i);
671 if (rap->rxa_qframes == 0)
672 break;
673 }
674 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
675 ("lost %u data, %u frames on ampdu rx q",
676 rap->rxa_qbytes, rap->rxa_qframes));
677 }
678
679 static void
ieee80211_ampdu_rx_init_rap(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)680 ieee80211_ampdu_rx_init_rap(struct ieee80211_node *ni,
681 struct ieee80211_rx_ampdu *rap)
682 {
683 int i;
684
685 /* XXX TODO: ensure the queues are empty */
686 memset(rap, 0, sizeof(*rap));
687 for (i = 0; i < IEEE80211_AGGR_BAWMAX; i++)
688 mbufq_init(&rap->rxa_mq[i], 256);
689 }
690
691 /*
692 * Start A-MPDU rx/re-order processing for the specified TID.
693 */
694 static int
ampdu_rx_start(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,int baparamset,int batimeout,int baseqctl)695 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
696 int baparamset, int batimeout, int baseqctl)
697 {
698 struct ieee80211vap *vap = ni->ni_vap;
699 int bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
700
701 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
702 /*
703 * AMPDU previously setup and not terminated with a DELBA,
704 * flush the reorder q's in case anything remains.
705 */
706 ampdu_rx_purge(rap);
707 }
708 ieee80211_ampdu_rx_init_rap(ni, rap);
709 rap->rxa_wnd = (bufsiz == 0) ?
710 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
711 rap->rxa_start = _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_START);
712 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
713
714 /* XXX this should be a configuration flag */
715 if ((vap->iv_htcaps & IEEE80211_HTC_RX_AMSDU_AMPDU) &&
716 (_IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU)))
717 rap->rxa_flags |= IEEE80211_AGGR_AMSDU;
718 else
719 rap->rxa_flags &= ~IEEE80211_AGGR_AMSDU;
720
721 return 0;
722 }
723
724 /*
725 * Public function; manually setup the RX ampdu state.
726 */
727 int
ieee80211_ampdu_rx_start_ext(struct ieee80211_node * ni,int tid,int seq,int baw)728 ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid, int seq, int baw)
729 {
730 struct ieee80211_rx_ampdu *rap;
731
732 /* XXX TODO: sanity check tid, seq, baw */
733
734 rap = &ni->ni_rx_ampdu[tid];
735
736 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
737 /*
738 * AMPDU previously setup and not terminated with a DELBA,
739 * flush the reorder q's in case anything remains.
740 */
741 ampdu_rx_purge(rap);
742 }
743
744 ieee80211_ampdu_rx_init_rap(ni, rap);
745
746 rap->rxa_wnd = (baw== 0) ?
747 IEEE80211_AGGR_BAWMAX : min(baw, IEEE80211_AGGR_BAWMAX);
748 if (seq == -1) {
749 /* Wait for the first RX frame, use that as BAW */
750 rap->rxa_start = 0;
751 rap->rxa_flags |= IEEE80211_AGGR_WAITRX;
752 } else {
753 rap->rxa_start = seq;
754 }
755 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
756
757 /* XXX TODO: no amsdu flag */
758
759 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
760 "%s: tid=%d, start=%d, wnd=%d, flags=0x%08x",
761 __func__,
762 tid,
763 seq,
764 rap->rxa_wnd,
765 rap->rxa_flags);
766
767 return 0;
768 }
769
770 /*
771 * Public function; manually stop the RX AMPDU state.
772 */
773 void
ieee80211_ampdu_rx_stop_ext(struct ieee80211_node * ni,int tid)774 ieee80211_ampdu_rx_stop_ext(struct ieee80211_node *ni, int tid)
775 {
776 struct ieee80211_rx_ampdu *rap;
777
778 /* XXX TODO: sanity check tid, seq, baw */
779 rap = &ni->ni_rx_ampdu[tid];
780 ampdu_rx_stop(ni, rap);
781 }
782
783 /*
784 * Stop A-MPDU rx processing for the specified TID.
785 */
786 static void
ampdu_rx_stop(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)787 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
788 {
789
790 ampdu_rx_purge(rap);
791 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING
792 | IEEE80211_AGGR_XCHGPEND
793 | IEEE80211_AGGR_WAITRX);
794 }
795
796 /*
797 * Dispatch a frame from the A-MPDU reorder queue. The
798 * frame is fed back into ieee80211_input marked with an
799 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
800 * permits ieee80211_input to optimize re-processing).
801 */
802 static __inline void
ampdu_dispatch(struct ieee80211_node * ni,struct mbuf * m)803 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
804 {
805 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
806 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
807 (void) ieee80211_input(ni, m, 0, 0);
808 }
809
810 static int
ampdu_dispatch_slot(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni,int i)811 ampdu_dispatch_slot(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni,
812 int i)
813 {
814 struct mbuf *m;
815 int n = 0;
816
817 while (mbufq_len(&rap->rxa_mq[i]) != 0) {
818 m = mbufq_dequeue(&rap->rxa_mq[i]);
819 if (m == NULL)
820 break;
821 n++;
822
823 rap->rxa_qbytes -= m->m_pkthdr.len;
824 rap->rxa_qframes--;
825
826 ampdu_dispatch(ni, m);
827 }
828 return (n);
829 }
830
831 static void
ampdu_rx_moveup(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni,int i,int winstart)832 ampdu_rx_moveup(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni,
833 int i, int winstart)
834 {
835 struct ieee80211vap *vap = ni->ni_vap;
836
837 /*
838 * If frames remain, copy the mbuf pointers down so
839 * they correspond to the offsets in the new window.
840 */
841 if (rap->rxa_qframes != 0) {
842 int n = rap->rxa_qframes, j;
843 for (j = i+1; j < rap->rxa_wnd; j++) {
844 /*
845 * Concat the list contents over, which will
846 * blank the source list for us.
847 */
848 if (mbufq_len(&rap->rxa_mq[j]) != 0) {
849 n = n - mbufq_len(&rap->rxa_mq[j]);
850 mbufq_concat(&rap->rxa_mq[j-i], &rap->rxa_mq[j]);
851 KASSERT(n >= 0, ("%s: n < 0 (%d)", __func__, n));
852 if (n == 0)
853 break;
854 }
855 }
856 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
857 "BA win <%d:%d> winstart %d",
858 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
859 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
860 winstart));
861 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
862 }
863 }
864
865 /*
866 * Dispatch as many frames as possible from the re-order queue.
867 * Frames will always be "at the front"; we process all frames
868 * up to the first empty slot in the window. On completion we
869 * cleanup state if there are still pending frames in the current
870 * BA window. We assume the frame at slot 0 is already handled
871 * by the caller; we always start at slot 1.
872 */
873 static void
ampdu_rx_dispatch(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni)874 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
875 {
876 struct ieee80211vap *vap = ni->ni_vap;
877 int i, r, r2;
878
879 /* flush run of frames */
880 r2 = 0;
881 for (i = 1; i < rap->rxa_wnd; i++) {
882 r = ampdu_dispatch_slot(rap, ni, i);
883 if (r == 0)
884 break;
885 r2 += r;
886 }
887
888 /* move up frames */
889 ampdu_rx_moveup(rap, ni, i, -1);
890
891 /*
892 * Adjust the start of the BA window to
893 * reflect the frames just dispatched.
894 */
895 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
896 vap->iv_stats.is_ampdu_rx_oor += r2;
897
898 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
899 "%s: moved slot up %d slots to start at %d (%d frames)",
900 __func__,
901 i,
902 rap->rxa_start,
903 r2);
904 }
905
906 /*
907 * Dispatch all frames in the A-MPDU re-order queue.
908 */
909 static void
ampdu_rx_flush(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)910 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
911 {
912 int i, r;
913
914 for (i = 0; i < rap->rxa_wnd; i++) {
915 r = ampdu_dispatch_slot(rap, ni, i);
916 if (r == 0)
917 continue;
918 ni->ni_vap->iv_stats.is_ampdu_rx_oor += r;
919
920 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
921 "%s: moved slot up %d slots to start at %d (%d frames)",
922 __func__,
923 1,
924 rap->rxa_start,
925 r);
926
927 if (rap->rxa_qframes == 0)
928 break;
929 }
930 }
931
932 /*
933 * Dispatch all frames in the A-MPDU re-order queue
934 * preceding the specified sequence number. This logic
935 * handles window moves due to a received MSDU or BAR.
936 */
937 static void
ampdu_rx_flush_upto(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,ieee80211_seq winstart)938 ampdu_rx_flush_upto(struct ieee80211_node *ni,
939 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
940 {
941 struct ieee80211vap *vap = ni->ni_vap;
942 ieee80211_seq seqno;
943 int i, r;
944
945 /*
946 * Flush any complete MSDU's with a sequence number lower
947 * than winstart. Gaps may exist. Note that we may actually
948 * dispatch frames past winstart if a run continues; this is
949 * an optimization that avoids having to do a separate pass
950 * to dispatch frames after moving the BA window start.
951 */
952 seqno = rap->rxa_start;
953 for (i = 0; i < rap->rxa_wnd; i++) {
954 if ((r = mbufq_len(&rap->rxa_mq[i])) != 0) {
955 (void) ampdu_dispatch_slot(rap, ni, i);
956 } else {
957 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
958 break;
959 }
960 vap->iv_stats.is_ampdu_rx_oor += r;
961 seqno = IEEE80211_SEQ_INC(seqno);
962
963 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
964 "%s: moved slot up %d slots to start at %d (%d frames)",
965 __func__,
966 1,
967 seqno,
968 r);
969 }
970
971 /*
972 * If frames remain, copy the mbuf pointers down so
973 * they correspond to the offsets in the new window.
974 */
975 ampdu_rx_moveup(rap, ni, i, winstart);
976
977 /*
978 * Move the start of the BA window; we use the
979 * sequence number of the last MSDU that was
980 * passed up the stack+1 or winstart if stopped on
981 * a gap in the reorder buffer.
982 */
983 rap->rxa_start = seqno;
984 }
985
986 /*
987 * Process a received QoS data frame for an HT station. Handle
988 * A-MPDU reordering: if this frame is received out of order
989 * and falls within the BA window hold onto it. Otherwise if
990 * this frame completes a run, flush any pending frames. We
991 * return 1 if the frame is consumed. A 0 is returned if
992 * the frame should be processed normally by the caller.
993 *
994 * A-MSDU: handle hardware decap'ed A-MSDU frames that are
995 * pretending to be MPDU's. They're dispatched directly if
996 * able; or attempted to put into the receive reordering slot.
997 */
998 int
ieee80211_ampdu_reorder(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs)999 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m,
1000 const struct ieee80211_rx_stats *rxs)
1001 {
1002 #define PROCESS 0 /* caller should process frame */
1003 #define CONSUMED 1 /* frame consumed, caller does nothing */
1004 struct ieee80211vap *vap = ni->ni_vap;
1005 struct ieee80211_qosframe *wh;
1006 struct ieee80211_rx_ampdu *rap;
1007 ieee80211_seq rxseq;
1008 uint8_t tid;
1009 int off;
1010 int amsdu = ieee80211_check_rxseq_amsdu(rxs);
1011 int amsdu_end = ieee80211_check_rxseq_amsdu_more(rxs);
1012
1013 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
1014 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
1015 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1016
1017 /* NB: m_len known to be sufficient */
1018 wh = mtod(m, struct ieee80211_qosframe *);
1019 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
1020 /*
1021 * Not QoS data, shouldn't get here but just
1022 * return it to the caller for processing.
1023 */
1024 return PROCESS;
1025 }
1026
1027 /*
1028 * 802.11-2012 9.3.2.10 - Duplicate detection and recovery.
1029 *
1030 * Multicast QoS data frames are checked against a different
1031 * counter, not the per-TID counter.
1032 */
1033 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
1034 return PROCESS;
1035
1036 tid = ieee80211_getqos(wh)[0];
1037 tid &= IEEE80211_QOS_TID;
1038 rap = &ni->ni_rx_ampdu[tid];
1039 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1040 /*
1041 * No ADDBA request yet, don't touch.
1042 */
1043 return PROCESS;
1044 }
1045 rxseq = le16toh(*(uint16_t *)wh->i_seq);
1046 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
1047 /*
1048 * Fragments are not allowed; toss.
1049 */
1050 IEEE80211_DISCARD_MAC(vap,
1051 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1052 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
1053 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1054 vap->iv_stats.is_ampdu_rx_drop++;
1055 IEEE80211_NODE_STAT(ni, rx_drop);
1056 m_freem(m);
1057 return CONSUMED;
1058 }
1059 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
1060 rap->rxa_nframes++;
1061
1062 /*
1063 * Handle waiting for the first frame to define the BAW.
1064 * Some firmware doesn't provide the RX of the starting point
1065 * of the BAW and we have to cope.
1066 */
1067 if (rap->rxa_flags & IEEE80211_AGGR_WAITRX) {
1068 rap->rxa_flags &= ~IEEE80211_AGGR_WAITRX;
1069 rap->rxa_start = rxseq;
1070 }
1071 again:
1072 if (rxseq == rap->rxa_start) {
1073 /*
1074 * First frame in window.
1075 */
1076 if (rap->rxa_qframes != 0) {
1077 /*
1078 * Dispatch as many packets as we can.
1079 */
1080 KASSERT((mbufq_len(&rap->rxa_mq[0]) == 0), ("unexpected dup"));
1081 ampdu_dispatch(ni, m);
1082 ampdu_rx_dispatch(rap, ni);
1083 return CONSUMED;
1084 } else {
1085 /*
1086 * In order; advance window if needed and notify
1087 * caller to dispatch directly.
1088 */
1089 if (amsdu) {
1090 if (amsdu_end) {
1091 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
1092 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
1093 } else {
1094 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
1095 }
1096 } else {
1097 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
1098 }
1099 return PROCESS;
1100 }
1101 }
1102 /*
1103 * Frame is out of order; store if in the BA window.
1104 */
1105 /* calculate offset in BA window */
1106 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1107 if (off < rap->rxa_wnd) {
1108 /*
1109 * Common case (hopefully): in the BA window.
1110 * Sec 9.10.7.6.2 a) (p.137)
1111 */
1112
1113 /*
1114 * Check for frames sitting too long in the reorder queue.
1115 * This should only ever happen if frames are not delivered
1116 * without the sender otherwise notifying us (e.g. with a
1117 * BAR to move the window). Typically this happens because
1118 * of vendor bugs that cause the sequence number to jump.
1119 * When this happens we get a gap in the reorder queue that
1120 * leaves frame sitting on the queue until they get pushed
1121 * out due to window moves. When the vendor does not send
1122 * BAR this move only happens due to explicit packet sends
1123 *
1124 * NB: we only track the time of the oldest frame in the
1125 * reorder q; this means that if we flush we might push
1126 * frames that still "new"; if this happens then subsequent
1127 * frames will result in BA window moves which cost something
1128 * but is still better than a big throughput dip.
1129 */
1130 if (rap->rxa_qframes != 0) {
1131 /* XXX honor batimeout? */
1132 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1133 /*
1134 * Too long since we received the first
1135 * frame; flush the reorder buffer.
1136 */
1137 if (rap->rxa_qframes != 0) {
1138 vap->iv_stats.is_ampdu_rx_age +=
1139 rap->rxa_qframes;
1140 ampdu_rx_flush(ni, rap);
1141 }
1142 /*
1143 * Advance the window if needed and notify
1144 * the caller to dispatch directly.
1145 */
1146 if (amsdu) {
1147 if (amsdu_end) {
1148 rap->rxa_start =
1149 IEEE80211_SEQ_INC(rxseq);
1150 IEEE80211_NODE_STAT(ni,
1151 rx_amsdu_more_end);
1152 } else {
1153 IEEE80211_NODE_STAT(ni,
1154 rx_amsdu_more);
1155 }
1156 } else {
1157 rap->rxa_start =
1158 IEEE80211_SEQ_INC(rxseq);
1159 }
1160 return PROCESS;
1161 }
1162 } else {
1163 /*
1164 * First frame, start aging timer.
1165 */
1166 rap->rxa_age = ticks;
1167 }
1168
1169 /* save packet - this consumes, no matter what */
1170 ampdu_rx_add_slot(rap, off, tid, rxseq, ni, m, rxs);
1171 return CONSUMED;
1172 }
1173 if (off < IEEE80211_SEQ_BA_RANGE) {
1174 /*
1175 * Outside the BA window, but within range;
1176 * flush the reorder q and move the window.
1177 * Sec 9.10.7.6.2 b) (p.138)
1178 */
1179 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1180 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
1181 rap->rxa_start,
1182 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1183 rap->rxa_qframes, rxseq, tid);
1184 vap->iv_stats.is_ampdu_rx_move++;
1185
1186 /*
1187 * The spec says to flush frames up to but not including:
1188 * WinStart_B = rxseq - rap->rxa_wnd + 1
1189 * Then insert the frame or notify the caller to process
1190 * it immediately. We can safely do this by just starting
1191 * over again because we know the frame will now be within
1192 * the BA window.
1193 */
1194 /* NB: rxa_wnd known to be >0 */
1195 ampdu_rx_flush_upto(ni, rap,
1196 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
1197 goto again;
1198 } else {
1199 /*
1200 * Outside the BA window and out of range; toss.
1201 * Sec 9.10.7.6.2 c) (p.138)
1202 */
1203 IEEE80211_DISCARD_MAC(vap,
1204 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1205 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1206 rap->rxa_start,
1207 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1208 rap->rxa_qframes, rxseq, tid,
1209 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1210 vap->iv_stats.is_ampdu_rx_drop++;
1211 IEEE80211_NODE_STAT(ni, rx_drop);
1212 m_freem(m);
1213 return CONSUMED;
1214 }
1215 #undef CONSUMED
1216 #undef PROCESS
1217 }
1218
1219 /*
1220 * Process a BAR ctl frame. Dispatch all frames up to
1221 * the sequence number of the frame. If this frame is
1222 * out of range it's discarded.
1223 */
1224 void
ieee80211_recv_bar(struct ieee80211_node * ni,struct mbuf * m0)1225 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
1226 {
1227 struct ieee80211vap *vap = ni->ni_vap;
1228 struct ieee80211_frame_bar *wh;
1229 struct ieee80211_rx_ampdu *rap;
1230 ieee80211_seq rxseq;
1231 int tid, off;
1232
1233 if (!ieee80211_recv_bar_ena) {
1234 #if 0
1235 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
1236 ni->ni_macaddr, "BAR", "%s", "processing disabled");
1237 #endif
1238 vap->iv_stats.is_ampdu_bar_bad++;
1239 return;
1240 }
1241 wh = mtod(m0, struct ieee80211_frame_bar *);
1242 /* XXX check basic BAR */
1243 tid = _IEEE80211_MASKSHIFT(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
1244 rap = &ni->ni_rx_ampdu[tid];
1245 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
1246 /*
1247 * No ADDBA request yet, don't touch.
1248 */
1249 IEEE80211_DISCARD_MAC(vap,
1250 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
1251 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
1252 vap->iv_stats.is_ampdu_bar_bad++;
1253 return;
1254 }
1255 vap->iv_stats.is_ampdu_bar_rx++;
1256 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
1257 if (rxseq == rap->rxa_start)
1258 return;
1259 /* calculate offset in BA window */
1260 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1261 if (off < IEEE80211_SEQ_BA_RANGE) {
1262 /*
1263 * Flush the reorder q up to rxseq and move the window.
1264 * Sec 9.10.7.6.3 a) (p.138)
1265 */
1266 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1267 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
1268 rap->rxa_start,
1269 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1270 rap->rxa_qframes, rxseq, tid);
1271 vap->iv_stats.is_ampdu_bar_move++;
1272
1273 ampdu_rx_flush_upto(ni, rap, rxseq);
1274 if (off >= rap->rxa_wnd) {
1275 /*
1276 * BAR specifies a window start to the right of BA
1277 * window; we must move it explicitly since
1278 * ampdu_rx_flush_upto will not.
1279 */
1280 rap->rxa_start = rxseq;
1281 }
1282 } else {
1283 /*
1284 * Out of range; toss.
1285 * Sec 9.10.7.6.3 b) (p.138)
1286 */
1287 IEEE80211_DISCARD_MAC(vap,
1288 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1289 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1290 rap->rxa_start,
1291 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1292 rap->rxa_qframes, rxseq, tid,
1293 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1294 vap->iv_stats.is_ampdu_bar_oow++;
1295 IEEE80211_NODE_STAT(ni, rx_drop);
1296 }
1297 }
1298
1299 /*
1300 * Setup HT-specific state in a node. Called only
1301 * when HT use is negotiated so we don't do extra
1302 * work for temporary and/or legacy sta's.
1303 */
1304 void
ieee80211_ht_node_init(struct ieee80211_node * ni)1305 ieee80211_ht_node_init(struct ieee80211_node *ni)
1306 {
1307 struct ieee80211_tx_ampdu *tap;
1308 int tid;
1309
1310 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1311 ni,
1312 "%s: called (%p)",
1313 __func__,
1314 ni);
1315
1316 if (ni->ni_flags & IEEE80211_NODE_HT) {
1317 /*
1318 * Clean AMPDU state on re-associate. This handles the case
1319 * where a station leaves w/o notifying us and then returns
1320 * before node is reaped for inactivity.
1321 */
1322 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1323 ni,
1324 "%s: calling cleanup (%p)",
1325 __func__, ni);
1326 ieee80211_ht_node_cleanup(ni);
1327 }
1328 for (tid = 0; tid < WME_NUM_TID; tid++) {
1329 tap = &ni->ni_tx_ampdu[tid];
1330 tap->txa_tid = tid;
1331 tap->txa_ni = ni;
1332 ieee80211_txampdu_init_pps(tap);
1333 /* NB: further initialization deferred */
1334 ieee80211_ampdu_rx_init_rap(ni, &ni->ni_rx_ampdu[tid]);
1335 }
1336 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU |
1337 IEEE80211_NODE_AMSDU;
1338 }
1339
1340 /*
1341 * Cleanup HT-specific state in a node. Called only
1342 * when HT use has been marked.
1343 */
1344 void
ieee80211_ht_node_cleanup(struct ieee80211_node * ni)1345 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1346 {
1347 struct ieee80211com *ic = ni->ni_ic;
1348 int i;
1349
1350 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1351 ni,
1352 "%s: called (%p)",
1353 __func__, ni);
1354
1355 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1356
1357 /* XXX optimize this */
1358 for (i = 0; i < WME_NUM_TID; i++) {
1359 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1360 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1361 ampdu_tx_stop(tap);
1362 }
1363 for (i = 0; i < WME_NUM_TID; i++)
1364 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1365
1366 ni->ni_htcap = 0;
1367 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1368 }
1369
1370 /*
1371 * Age out HT resources for a station.
1372 */
1373 void
ieee80211_ht_node_age(struct ieee80211_node * ni)1374 ieee80211_ht_node_age(struct ieee80211_node *ni)
1375 {
1376 struct ieee80211vap *vap = ni->ni_vap;
1377 uint8_t tid;
1378
1379 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1380
1381 for (tid = 0; tid < WME_NUM_TID; tid++) {
1382 struct ieee80211_rx_ampdu *rap;
1383
1384 rap = &ni->ni_rx_ampdu[tid];
1385 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1386 continue;
1387 if (rap->rxa_qframes == 0)
1388 continue;
1389 /*
1390 * Check for frames sitting too long in the reorder queue.
1391 * See above for more details on what's happening here.
1392 */
1393 /* XXX honor batimeout? */
1394 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1395 /*
1396 * Too long since we received the first
1397 * frame; flush the reorder buffer.
1398 */
1399 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1400 ampdu_rx_flush(ni, rap);
1401 }
1402 }
1403 }
1404
1405 static struct ieee80211_channel *
findhtchan(struct ieee80211com * ic,struct ieee80211_channel * c,int htflags)1406 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1407 {
1408 return ieee80211_find_channel(ic, c->ic_freq,
1409 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1410 }
1411
1412 /*
1413 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1414 */
1415 struct ieee80211_channel *
ieee80211_ht_adjust_channel(struct ieee80211com * ic,struct ieee80211_channel * chan,int flags)1416 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1417 struct ieee80211_channel *chan, int flags)
1418 {
1419 struct ieee80211_channel *c;
1420
1421 if (flags & IEEE80211_FHT_HT) {
1422 /* promote to HT if possible */
1423 if (flags & IEEE80211_FHT_USEHT40) {
1424 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1425 /* NB: arbitrarily pick ht40+ over ht40- */
1426 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1427 if (c == NULL)
1428 c = findhtchan(ic, chan,
1429 IEEE80211_CHAN_HT40D);
1430 if (c == NULL)
1431 c = findhtchan(ic, chan,
1432 IEEE80211_CHAN_HT20);
1433 if (c != NULL)
1434 chan = c;
1435 }
1436 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1437 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1438 if (c != NULL)
1439 chan = c;
1440 }
1441 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1442 /* demote to legacy, HT use is disabled */
1443 c = ieee80211_find_channel(ic, chan->ic_freq,
1444 chan->ic_flags &~ IEEE80211_CHAN_HT);
1445 if (c != NULL)
1446 chan = c;
1447 }
1448 return chan;
1449 }
1450
1451 /*
1452 * Setup HT-specific state for a legacy WDS peer.
1453 */
1454 void
ieee80211_ht_wds_init(struct ieee80211_node * ni)1455 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1456 {
1457 struct ieee80211vap *vap = ni->ni_vap;
1458 struct ieee80211_tx_ampdu *tap;
1459 int tid;
1460
1461 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1462
1463 /* XXX check scan cache in case peer has an ap and we have info */
1464 /*
1465 * If setup with a legacy channel; locate an HT channel.
1466 * Otherwise if the inherited channel (from a companion
1467 * AP) is suitable use it so we use the same location
1468 * for the extension channel).
1469 */
1470 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1471 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1472
1473 ni->ni_htcap = 0;
1474 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1475 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1476 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1477 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1478 ni->ni_chw = 40;
1479 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1480 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1481 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1482 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1483 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1484 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1485 } else {
1486 ni->ni_chw = 20;
1487 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1488 }
1489 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1490 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1491 ni->ni_flags |= IEEE80211_NODE_RIFS;
1492 /* XXX does it make sense to enable SMPS? */
1493
1494 ni->ni_htopmode = 0; /* XXX need protection state */
1495 ni->ni_htstbc = 0; /* XXX need info */
1496
1497 for (tid = 0; tid < WME_NUM_TID; tid++) {
1498 tap = &ni->ni_tx_ampdu[tid];
1499 tap->txa_tid = tid;
1500 ieee80211_txampdu_init_pps(tap);
1501 }
1502 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1503 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU |
1504 IEEE80211_NODE_AMSDU;
1505 }
1506
1507 /*
1508 * Notify a VAP of a change in the HTINFO ie if it's a hostap VAP.
1509 *
1510 * This is to be called from the deferred HT protection update
1511 * task once the flags are updated.
1512 */
1513 void
ieee80211_htinfo_notify(struct ieee80211vap * vap)1514 ieee80211_htinfo_notify(struct ieee80211vap *vap)
1515 {
1516
1517 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1518
1519 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1520 return;
1521 if (vap->iv_state != IEEE80211_S_RUN ||
1522 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1523 return;
1524
1525 IEEE80211_NOTE(vap,
1526 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1527 vap->iv_bss,
1528 "HT bss occupancy change: %d sta, %d ht, "
1529 "%d ht40%s, HT protmode now 0x%x"
1530 , vap->iv_sta_assoc
1531 , vap->iv_ht_sta_assoc
1532 , vap->iv_ht40_sta_assoc
1533 , (vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1534 ", non-HT sta present" : ""
1535 , vap->iv_curhtprotmode);
1536
1537 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1538 }
1539
1540 /*
1541 * Calculate HT protection mode from current
1542 * state and handle updates.
1543 */
1544 static void
htinfo_update(struct ieee80211vap * vap)1545 htinfo_update(struct ieee80211vap *vap)
1546 {
1547 struct ieee80211com *ic = vap->iv_ic;
1548 uint8_t protmode;
1549
1550 if (vap->iv_sta_assoc != vap->iv_ht_sta_assoc) {
1551 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1552 | IEEE80211_HTINFO_NONHT_PRESENT;
1553 } else if (vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) {
1554 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1555 | IEEE80211_HTINFO_NONHT_PRESENT;
1556 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1557 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1558 vap->iv_sta_assoc != vap->iv_ht40_sta_assoc) {
1559 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1560 } else {
1561 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1562 }
1563 if (protmode != vap->iv_curhtprotmode) {
1564 vap->iv_curhtprotmode = protmode;
1565 /* Update VAP with new protection mode */
1566 ieee80211_vap_update_ht_protmode(vap);
1567 }
1568 }
1569
1570 /*
1571 * Handle an HT station joining a BSS.
1572 */
1573 void
ieee80211_ht_node_join(struct ieee80211_node * ni)1574 ieee80211_ht_node_join(struct ieee80211_node *ni)
1575 {
1576 struct ieee80211vap *vap = ni->ni_vap;
1577
1578 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1579
1580 if (ni->ni_flags & IEEE80211_NODE_HT) {
1581 vap->iv_ht_sta_assoc++;
1582 if (ni->ni_chw == 40)
1583 vap->iv_ht40_sta_assoc++;
1584 }
1585 htinfo_update(vap);
1586 }
1587
1588 /*
1589 * Handle an HT station leaving a BSS.
1590 */
1591 void
ieee80211_ht_node_leave(struct ieee80211_node * ni)1592 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1593 {
1594 struct ieee80211vap *vap = ni->ni_vap;
1595
1596 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1597
1598 if (ni->ni_flags & IEEE80211_NODE_HT) {
1599 vap->iv_ht_sta_assoc--;
1600 if (ni->ni_chw == 40)
1601 vap->iv_ht40_sta_assoc--;
1602 }
1603 htinfo_update(vap);
1604 }
1605
1606 /*
1607 * Public version of htinfo_update; used for processing
1608 * beacon frames from overlapping bss.
1609 *
1610 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1611 * (on receipt of a beacon that advertises MIXED) or
1612 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1613 * from an overlapping legacy bss). We treat MIXED with
1614 * a higher precedence than PROTOPT (i.e. we will not change
1615 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1616 * corresponds to how we handle things in htinfo_update.
1617 *
1618 */
1619 void
ieee80211_htprot_update(struct ieee80211vap * vap,int protmode)1620 ieee80211_htprot_update(struct ieee80211vap *vap, int protmode)
1621 {
1622 struct ieee80211com *ic = vap->iv_ic;
1623 #define OPMODE(x) _IEEE80211_SHIFTMASK(x, IEEE80211_HTINFO_OPMODE)
1624 IEEE80211_LOCK(ic);
1625
1626 /* track non-HT station presence */
1627 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1628 ("protmode 0x%x", protmode));
1629 vap->iv_flags_ht |= IEEE80211_FHT_NONHT_PR;
1630 vap->iv_lastnonht = ticks;
1631
1632 if (protmode != vap->iv_curhtprotmode &&
1633 (OPMODE(vap->iv_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1634 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1635 vap->iv_curhtprotmode = protmode;
1636 /* Update VAP with new protection mode */
1637 ieee80211_vap_update_ht_protmode(vap);
1638 }
1639 IEEE80211_UNLOCK(ic);
1640 #undef OPMODE
1641 }
1642
1643 /*
1644 * Time out presence of an overlapping bss with non-HT
1645 * stations. When operating in hostap mode we listen for
1646 * beacons from other stations and if we identify a non-HT
1647 * station is present we update the opmode field of the
1648 * HTINFO ie. To identify when all non-HT stations are
1649 * gone we time out this condition.
1650 */
1651 void
ieee80211_ht_timeout(struct ieee80211vap * vap)1652 ieee80211_ht_timeout(struct ieee80211vap *vap)
1653 {
1654
1655 IEEE80211_LOCK_ASSERT(vap->iv_ic);
1656
1657 if ((vap->iv_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1658 ieee80211_time_after(ticks, vap->iv_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1659 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
1660 "%s", "time out non-HT STA present on channel");
1661 vap->iv_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1662 htinfo_update(vap);
1663 }
1664 }
1665
1666 /*
1667 * Process an 802.11n HT capabilities ie.
1668 */
1669 void
ieee80211_parse_htcap(struct ieee80211_node * ni,const uint8_t * ie)1670 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1671 {
1672 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1673 /*
1674 * Station used Vendor OUI ie to associate;
1675 * mark the node so when we respond we'll use
1676 * the Vendor OUI's and not the standard ie's.
1677 */
1678 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1679 ie += 4;
1680 } else
1681 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1682
1683 ni->ni_htcap = le16dec(ie +
1684 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1685 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1686 }
1687
1688 static void
htinfo_parse(struct ieee80211_node * ni,const struct ieee80211_ie_htinfo * htinfo)1689 htinfo_parse(struct ieee80211_node *ni,
1690 const struct ieee80211_ie_htinfo *htinfo)
1691 {
1692 uint16_t w;
1693
1694 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1695 ni->ni_ht2ndchan = _IEEE80211_SHIFTMASK(htinfo->hi_byte1,
1696 IEEE80211_HTINFO_2NDCHAN);
1697 w = le16dec(&htinfo->hi_byte2);
1698 ni->ni_htopmode = _IEEE80211_SHIFTMASK(w, IEEE80211_HTINFO_OPMODE);
1699 w = le16dec(&htinfo->hi_byte45);
1700 ni->ni_htstbc = _IEEE80211_SHIFTMASK(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1701 }
1702
1703 /*
1704 * Parse an 802.11n HT info ie and save useful information
1705 * to the node state. Note this does not effect any state
1706 * changes such as for channel width change.
1707 */
1708 void
ieee80211_parse_htinfo(struct ieee80211_node * ni,const uint8_t * ie)1709 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1710 {
1711 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1712 ie += 4;
1713 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1714 }
1715
1716 /*
1717 * Handle 11n/11ac channel switch.
1718 *
1719 * Use the received HT/VHT ie's to identify the right channel to use.
1720 * If we cannot locate it in the channel table then fallback to
1721 * legacy operation.
1722 *
1723 * Note that we use this information to identify the node's
1724 * channel only; the caller is responsible for insuring any
1725 * required channel change is done (e.g. in sta mode when
1726 * parsing the contents of a beacon frame).
1727 */
1728 static int
htinfo_update_chw(struct ieee80211_node * ni,int htflags,int vhtflags)1729 htinfo_update_chw(struct ieee80211_node *ni, int htflags, int vhtflags)
1730 {
1731 struct ieee80211com *ic = ni->ni_ic;
1732 struct ieee80211_channel *c;
1733 int chanflags;
1734 int ret = 0;
1735
1736 /*
1737 * First step - do HT/VHT only channel lookup based on operating mode
1738 * flags. This involves masking out the VHT flags as well.
1739 * Otherwise we end up doing the full channel walk each time
1740 * we trigger this, which is expensive.
1741 */
1742 chanflags = (ni->ni_chan->ic_flags &~
1743 (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT)) | htflags | vhtflags;
1744
1745 if (chanflags == ni->ni_chan->ic_flags)
1746 goto done;
1747
1748 /*
1749 * If HT /or/ VHT flags have changed then check both.
1750 * We need to start by picking a HT channel anyway.
1751 */
1752
1753 c = NULL;
1754 chanflags = (ni->ni_chan->ic_flags &~
1755 (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT)) | htflags;
1756 /* XXX not right for ht40- */
1757 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1758 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1759 /*
1760 * No HT40 channel entry in our table; fall back
1761 * to HT20 operation. This should not happen.
1762 */
1763 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1764 #if 0
1765 IEEE80211_NOTE(ni->ni_vap,
1766 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1767 "no HT40 channel (freq %u), falling back to HT20",
1768 ni->ni_chan->ic_freq);
1769 #endif
1770 /* XXX stat */
1771 }
1772
1773 /* Nothing found - leave it alone; move onto VHT */
1774 if (c == NULL)
1775 c = ni->ni_chan;
1776
1777 /*
1778 * If it's non-HT, then bail out now.
1779 */
1780 if (! IEEE80211_IS_CHAN_HT(c)) {
1781 IEEE80211_NOTE(ni->ni_vap,
1782 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1783 "not HT; skipping VHT check (%u/0x%x)",
1784 c->ic_freq, c->ic_flags);
1785 goto done;
1786 }
1787
1788 /*
1789 * Next step - look at the current VHT flags and determine
1790 * if we need to upgrade. Mask out the VHT and HT flags since
1791 * the vhtflags field will already have the correct HT
1792 * flags to use.
1793 */
1794 if (IEEE80211_CONF_VHT(ic) && ni->ni_vhtcap != 0 && vhtflags != 0) {
1795 chanflags = (c->ic_flags
1796 &~ (IEEE80211_CHAN_HT | IEEE80211_CHAN_VHT))
1797 | vhtflags;
1798 IEEE80211_NOTE(ni->ni_vap,
1799 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1800 ni,
1801 "%s: VHT; chanwidth=0x%02x; vhtflags=0x%08x",
1802 __func__, ni->ni_vht_chanwidth, vhtflags);
1803
1804 IEEE80211_NOTE(ni->ni_vap,
1805 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1806 ni,
1807 "%s: VHT; trying lookup for %d/0x%08x",
1808 __func__, c->ic_freq, chanflags);
1809 c = ieee80211_find_channel(ic, c->ic_freq, chanflags);
1810 }
1811
1812 /* Finally, if it's changed */
1813 if (c != NULL && c != ni->ni_chan) {
1814 IEEE80211_NOTE(ni->ni_vap,
1815 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1816 "switch station to %s%d channel %u/0x%x",
1817 IEEE80211_IS_CHAN_VHT(c) ? "VHT" : "HT",
1818 IEEE80211_IS_CHAN_VHT80(c) ? 80 :
1819 (IEEE80211_IS_CHAN_HT40(c) ? 40 : 20),
1820 c->ic_freq, c->ic_flags);
1821 ni->ni_chan = c;
1822 ret = 1;
1823 }
1824 /* NB: caller responsible for forcing any channel change */
1825
1826 done:
1827 /* update node's (11n) tx channel width */
1828 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1829 return (ret);
1830 }
1831
1832 /*
1833 * Update 11n MIMO PS state according to received htcap.
1834 */
1835 static __inline int
htcap_update_mimo_ps(struct ieee80211_node * ni)1836 htcap_update_mimo_ps(struct ieee80211_node *ni)
1837 {
1838 uint16_t oflags = ni->ni_flags;
1839
1840 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1841 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1842 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1843 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1844 break;
1845 case IEEE80211_HTCAP_SMPS_ENA:
1846 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1847 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1848 break;
1849 case IEEE80211_HTCAP_SMPS_OFF:
1850 default: /* disable on rx of reserved value */
1851 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1852 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1853 break;
1854 }
1855 return (oflags ^ ni->ni_flags);
1856 }
1857
1858 /*
1859 * Update short GI state according to received htcap
1860 * and local settings.
1861 */
1862 static __inline void
htcap_update_shortgi(struct ieee80211_node * ni)1863 htcap_update_shortgi(struct ieee80211_node *ni)
1864 {
1865 struct ieee80211vap *vap = ni->ni_vap;
1866
1867 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1868 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1869 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1870 ni->ni_flags |= IEEE80211_NODE_SGI20;
1871 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1872 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1873 ni->ni_flags |= IEEE80211_NODE_SGI40;
1874 }
1875
1876 /*
1877 * Update LDPC state according to received htcap
1878 * and local settings.
1879 */
1880 static __inline void
htcap_update_ldpc(struct ieee80211_node * ni)1881 htcap_update_ldpc(struct ieee80211_node *ni)
1882 {
1883 struct ieee80211vap *vap = ni->ni_vap;
1884
1885 if ((ni->ni_htcap & IEEE80211_HTCAP_LDPC) &&
1886 (vap->iv_flags_ht & IEEE80211_FHT_LDPC_TX))
1887 ni->ni_flags |= IEEE80211_NODE_LDPC;
1888 }
1889
1890 /*
1891 * Parse and update HT-related state extracted from
1892 * the HT cap and info ie's.
1893 *
1894 * This is called from the STA management path and
1895 * the ieee80211_node_join() path. It will take into
1896 * account the IEs discovered during scanning and
1897 * adjust things accordingly.
1898 */
1899 void
ieee80211_ht_updateparams(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)1900 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1901 const uint8_t *htcapie, const uint8_t *htinfoie)
1902 {
1903 struct ieee80211vap *vap = ni->ni_vap;
1904 const struct ieee80211_ie_htinfo *htinfo;
1905
1906 ieee80211_parse_htcap(ni, htcapie);
1907 if (vap->iv_htcaps & IEEE80211_HTC_SMPS)
1908 htcap_update_mimo_ps(ni);
1909 htcap_update_shortgi(ni);
1910 htcap_update_ldpc(ni);
1911
1912 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1913 htinfoie += 4;
1914 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1915 htinfo_parse(ni, htinfo);
1916
1917 /*
1918 * Defer the node channel change; we need to now
1919 * update VHT parameters before we do it.
1920 */
1921
1922 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1923 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1924 ni->ni_flags |= IEEE80211_NODE_RIFS;
1925 else
1926 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1927 }
1928
1929 static uint32_t
ieee80211_vht_get_vhtflags(struct ieee80211_node * ni,uint32_t htflags)1930 ieee80211_vht_get_vhtflags(struct ieee80211_node *ni, uint32_t htflags)
1931 {
1932 struct ieee80211vap *vap = ni->ni_vap;
1933 uint32_t vhtflags = 0;
1934
1935 vhtflags = 0;
1936 if (ni->ni_flags & IEEE80211_NODE_VHT && vap->iv_flags_vht & IEEE80211_FVHT_VHT) {
1937 if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_160MHZ) &&
1938 /* XXX 2 means "160MHz and 80+80MHz", 1 means "160MHz" */
1939 (_IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
1940 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK) >= 1) &&
1941 (vap->iv_flags_vht & IEEE80211_FVHT_USEVHT160)) {
1942 vhtflags = IEEE80211_CHAN_VHT160;
1943 /* Mirror the HT40 flags */
1944 if (htflags == IEEE80211_CHAN_HT40U) {
1945 vhtflags |= IEEE80211_CHAN_HT40U;
1946 } else if (htflags == IEEE80211_CHAN_HT40D) {
1947 vhtflags |= IEEE80211_CHAN_HT40D;
1948 }
1949 } else if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_80P80MHZ) &&
1950 /* XXX 2 means "160MHz and 80+80MHz" */
1951 (_IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
1952 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK) == 2) &&
1953 (vap->iv_flags_vht & IEEE80211_FVHT_USEVHT80P80)) {
1954 vhtflags = IEEE80211_CHAN_VHT80P80;
1955 /* Mirror the HT40 flags */
1956 if (htflags == IEEE80211_CHAN_HT40U) {
1957 vhtflags |= IEEE80211_CHAN_HT40U;
1958 } else if (htflags == IEEE80211_CHAN_HT40D) {
1959 vhtflags |= IEEE80211_CHAN_HT40D;
1960 }
1961 } else if ((ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_80MHZ) &&
1962 (vap->iv_flags_vht & IEEE80211_FVHT_USEVHT80)) {
1963 vhtflags = IEEE80211_CHAN_VHT80;
1964 /* Mirror the HT40 flags */
1965 if (htflags == IEEE80211_CHAN_HT40U) {
1966 vhtflags |= IEEE80211_CHAN_HT40U;
1967 } else if (htflags == IEEE80211_CHAN_HT40D) {
1968 vhtflags |= IEEE80211_CHAN_HT40D;
1969 }
1970 } else if (ni->ni_vht_chanwidth == IEEE80211_VHT_CHANWIDTH_USE_HT) {
1971 /* Mirror the HT40 flags */
1972 /*
1973 * XXX TODO: if ht40 is disabled, but vht40 isn't
1974 * disabled then this logic will get very, very sad.
1975 * It's quite possible the only sane thing to do is
1976 * to not have vht40 as an option, and just obey
1977 * 'ht40' as that flag.
1978 */
1979 if ((htflags == IEEE80211_CHAN_HT40U) &&
1980 (vap->iv_flags_vht & IEEE80211_FVHT_USEVHT40)) {
1981 vhtflags = IEEE80211_CHAN_VHT40U
1982 | IEEE80211_CHAN_HT40U;
1983 } else if (htflags == IEEE80211_CHAN_HT40D &&
1984 (vap->iv_flags_vht & IEEE80211_FVHT_USEVHT40)) {
1985 vhtflags = IEEE80211_CHAN_VHT40D
1986 | IEEE80211_CHAN_HT40D;
1987 } else if (htflags == IEEE80211_CHAN_HT20) {
1988 vhtflags = IEEE80211_CHAN_VHT20
1989 | IEEE80211_CHAN_HT20;
1990 }
1991 } else {
1992 vhtflags = IEEE80211_CHAN_VHT20;
1993 }
1994 }
1995 return (vhtflags);
1996 }
1997
1998 /*
1999 * Final part of updating the HT parameters.
2000 *
2001 * This is called from the STA management path and
2002 * the ieee80211_node_join() path. It will take into
2003 * account the IEs discovered during scanning and
2004 * adjust things accordingly.
2005 *
2006 * This is done after a call to ieee80211_ht_updateparams()
2007 * because it (and the upcoming VHT version of updateparams)
2008 * needs to ensure everything is parsed before htinfo_update_chw()
2009 * is called - which will change the channel config for the
2010 * node for us.
2011 */
2012 int
ieee80211_ht_updateparams_final(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)2013 ieee80211_ht_updateparams_final(struct ieee80211_node *ni,
2014 const uint8_t *htcapie, const uint8_t *htinfoie)
2015 {
2016 struct ieee80211vap *vap = ni->ni_vap;
2017 const struct ieee80211_ie_htinfo *htinfo;
2018 int htflags, vhtflags;
2019 int ret = 0;
2020
2021 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
2022
2023 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
2024 IEEE80211_CHAN_HT20 : 0;
2025
2026 /* NB: honor operating mode constraint */
2027 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
2028 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
2029 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
2030 htflags = IEEE80211_CHAN_HT40U;
2031 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
2032 htflags = IEEE80211_CHAN_HT40D;
2033 }
2034
2035 /*
2036 * VHT flags - do much the same; check whether VHT is available
2037 * and if so, what our ideal channel use would be based on our
2038 * capabilities and the (pre-parsed) VHT info IE.
2039 */
2040 vhtflags = ieee80211_vht_get_vhtflags(ni, htflags);
2041
2042 if (htinfo_update_chw(ni, htflags, vhtflags))
2043 ret = 1;
2044
2045 return (ret);
2046 }
2047
2048 /*
2049 * Parse and update HT-related state extracted from the HT cap ie
2050 * for a station joining an HT BSS.
2051 *
2052 * This is called from the hostap path for each station.
2053 */
2054 void
ieee80211_ht_updatehtcap(struct ieee80211_node * ni,const uint8_t * htcapie)2055 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
2056 {
2057 struct ieee80211vap *vap = ni->ni_vap;
2058
2059 ieee80211_parse_htcap(ni, htcapie);
2060 if (vap->iv_htcaps & IEEE80211_HTC_SMPS)
2061 htcap_update_mimo_ps(ni);
2062 htcap_update_shortgi(ni);
2063 htcap_update_ldpc(ni);
2064 }
2065
2066 /*
2067 * Called once HT and VHT capabilities are parsed in hostap mode -
2068 * this will adjust the channel configuration of the given node
2069 * based on the configuration and capabilities.
2070 */
2071 void
ieee80211_ht_updatehtcap_final(struct ieee80211_node * ni)2072 ieee80211_ht_updatehtcap_final(struct ieee80211_node *ni)
2073 {
2074 struct ieee80211vap *vap = ni->ni_vap;
2075 int htflags;
2076 int vhtflags;
2077
2078 /* NB: honor operating mode constraint */
2079 /* XXX 40 MHz intolerant */
2080 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
2081 IEEE80211_CHAN_HT20 : 0;
2082 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
2083 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
2084 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
2085 htflags = IEEE80211_CHAN_HT40U;
2086 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
2087 htflags = IEEE80211_CHAN_HT40D;
2088 }
2089 /*
2090 * VHT flags - do much the same; check whether VHT is available
2091 * and if so, what our ideal channel use would be based on our
2092 * capabilities and the (pre-parsed) VHT info IE.
2093 */
2094 vhtflags = ieee80211_vht_get_vhtflags(ni, htflags);
2095
2096 (void) htinfo_update_chw(ni, htflags, vhtflags);
2097 }
2098
2099 /*
2100 * Install received HT rate set by parsing the HT cap ie.
2101 */
2102 int
ieee80211_setup_htrates(struct ieee80211_node * ni,const uint8_t * ie,int flags)2103 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
2104 {
2105 struct ieee80211com *ic = ni->ni_ic;
2106 struct ieee80211vap *vap = ni->ni_vap;
2107 const struct ieee80211_ie_htcap *htcap;
2108 struct ieee80211_htrateset *rs;
2109 int i, maxequalmcs, maxunequalmcs;
2110
2111 maxequalmcs = ic->ic_txstream * 8 - 1;
2112 maxunequalmcs = 0;
2113 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
2114 if (ic->ic_txstream >= 2)
2115 maxunequalmcs = 38;
2116 if (ic->ic_txstream >= 3)
2117 maxunequalmcs = 52;
2118 if (ic->ic_txstream >= 4)
2119 maxunequalmcs = 76;
2120 }
2121
2122 rs = &ni->ni_htrates;
2123 memset(rs, 0, sizeof(*rs));
2124 if (ie != NULL) {
2125 if (ie[0] == IEEE80211_ELEMID_VENDOR)
2126 ie += 4;
2127 htcap = (const struct ieee80211_ie_htcap *) ie;
2128 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
2129 if (isclr(htcap->hc_mcsset, i))
2130 continue;
2131 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
2132 IEEE80211_NOTE(vap,
2133 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
2134 "WARNING, HT rate set too large; only "
2135 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
2136 vap->iv_stats.is_rx_rstoobig++;
2137 break;
2138 }
2139 if (i <= 31 && i > maxequalmcs)
2140 continue;
2141 if (i == 32 &&
2142 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
2143 continue;
2144 if (i > 32 && i > maxunequalmcs)
2145 continue;
2146 rs->rs_rates[rs->rs_nrates++] = i;
2147 }
2148 }
2149 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
2150 }
2151
2152 /*
2153 * Mark rates in a node's HT rate set as basic according
2154 * to the information in the supplied HT info ie.
2155 */
2156 void
ieee80211_setup_basic_htrates(struct ieee80211_node * ni,const uint8_t * ie)2157 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
2158 {
2159 const struct ieee80211_ie_htinfo *htinfo;
2160 struct ieee80211_htrateset *rs;
2161 int i, j;
2162
2163 if (ie[0] == IEEE80211_ELEMID_VENDOR)
2164 ie += 4;
2165 htinfo = (const struct ieee80211_ie_htinfo *) ie;
2166 rs = &ni->ni_htrates;
2167 if (rs->rs_nrates == 0) {
2168 IEEE80211_NOTE(ni->ni_vap,
2169 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
2170 "%s", "WARNING, empty HT rate set");
2171 return;
2172 }
2173 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
2174 if (isclr(htinfo->hi_basicmcsset, i))
2175 continue;
2176 for (j = 0; j < rs->rs_nrates; j++)
2177 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
2178 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
2179 }
2180 }
2181
2182 static void
ampdu_tx_setup(struct ieee80211_tx_ampdu * tap)2183 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
2184 {
2185 callout_init(&tap->txa_timer, 1);
2186 tap->txa_flags |= IEEE80211_AGGR_SETUP;
2187 tap->txa_lastsample = ticks;
2188 }
2189
2190 static void
ampdu_tx_stop(struct ieee80211_tx_ampdu * tap)2191 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
2192 {
2193 struct ieee80211_node *ni = tap->txa_ni;
2194 struct ieee80211com *ic = ni->ni_ic;
2195
2196 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2197 tap->txa_ni,
2198 "%s: called",
2199 __func__);
2200
2201 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
2202 ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
2203 TID_TO_WME_AC(tap->txa_tid)));
2204
2205 /*
2206 * Stop BA stream if setup so driver has a chance
2207 * to reclaim any resources it might have allocated.
2208 */
2209 ic->ic_addba_stop(ni, tap);
2210 /*
2211 * Stop any pending BAR transmit.
2212 */
2213 bar_stop_timer(tap);
2214
2215 /*
2216 * Reset packet estimate.
2217 */
2218 ieee80211_txampdu_init_pps(tap);
2219
2220 /* NB: clearing NAK means we may re-send ADDBA */
2221 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
2222 }
2223
2224 /*
2225 * ADDBA response timeout.
2226 *
2227 * If software aggregation and per-TID queue management was done here,
2228 * that queue would be unpaused after the ADDBA timeout occurs.
2229 */
2230 static void
addba_timeout(void * arg)2231 addba_timeout(void *arg)
2232 {
2233 struct ieee80211_tx_ampdu *tap = arg;
2234 struct ieee80211_node *ni = tap->txa_ni;
2235 struct ieee80211com *ic = ni->ni_ic;
2236
2237 /* XXX ? */
2238 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
2239 tap->txa_attempts++;
2240 ic->ic_addba_response_timeout(ni, tap);
2241 }
2242
2243 static void
addba_start_timeout(struct ieee80211_tx_ampdu * tap)2244 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
2245 {
2246 /* XXX use CALLOUT_PENDING instead? */
2247 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
2248 addba_timeout, tap);
2249 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
2250 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
2251 }
2252
2253 static void
addba_stop_timeout(struct ieee80211_tx_ampdu * tap)2254 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
2255 {
2256 /* XXX use CALLOUT_PENDING instead? */
2257 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
2258 callout_stop(&tap->txa_timer);
2259 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
2260 }
2261 }
2262
2263 static void
null_addba_response_timeout(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2264 null_addba_response_timeout(struct ieee80211_node *ni,
2265 struct ieee80211_tx_ampdu *tap)
2266 {
2267 }
2268
2269 /*
2270 * Default method for requesting A-MPDU tx aggregation.
2271 * We setup the specified state block and start a timer
2272 * to wait for an ADDBA response frame.
2273 */
2274 static int
ieee80211_addba_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int dialogtoken,int baparamset,int batimeout)2275 ieee80211_addba_request(struct ieee80211_node *ni,
2276 struct ieee80211_tx_ampdu *tap,
2277 int dialogtoken, int baparamset, int batimeout)
2278 {
2279 int bufsiz;
2280
2281 /* XXX locking */
2282 tap->txa_token = dialogtoken;
2283 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
2284 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2285 tap->txa_wnd = (bufsiz == 0) ?
2286 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
2287 addba_start_timeout(tap);
2288 return 1;
2289 }
2290
2291 /*
2292 * Called by drivers that wish to request an ADDBA session be
2293 * setup. This brings it up and starts the request timer.
2294 */
2295 int
ieee80211_ampdu_tx_request_ext(struct ieee80211_node * ni,int tid)2296 ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid)
2297 {
2298 struct ieee80211_tx_ampdu *tap;
2299
2300 if (tid < 0 || tid > 15)
2301 return (0);
2302 tap = &ni->ni_tx_ampdu[tid];
2303
2304 /* XXX locking */
2305 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2306 /* do deferred setup of state */
2307 ampdu_tx_setup(tap);
2308 }
2309 /* XXX hack for not doing proper locking */
2310 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2311 addba_start_timeout(tap);
2312 return (1);
2313 }
2314
2315 /*
2316 * Called by drivers that have marked a session as active.
2317 */
2318 int
ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node * ni,int tid,int status)2319 ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni, int tid,
2320 int status)
2321 {
2322 struct ieee80211_tx_ampdu *tap;
2323
2324 if (tid < 0 || tid > 15)
2325 return (0);
2326 tap = &ni->ni_tx_ampdu[tid];
2327
2328 /* XXX locking */
2329 addba_stop_timeout(tap);
2330 if (status == 1) {
2331 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
2332 tap->txa_attempts = 0;
2333 } else {
2334 /* mark tid so we don't try again */
2335 tap->txa_flags |= IEEE80211_AGGR_NAK;
2336 }
2337 return (1);
2338 }
2339
2340 /*
2341 * Default method for processing an A-MPDU tx aggregation
2342 * response. We shutdown any pending timer and update the
2343 * state block according to the reply.
2344 */
2345 static int
ieee80211_addba_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status,int baparamset,int batimeout)2346 ieee80211_addba_response(struct ieee80211_node *ni,
2347 struct ieee80211_tx_ampdu *tap,
2348 int status, int baparamset, int batimeout)
2349 {
2350 struct ieee80211vap *vap = ni->ni_vap;
2351 int bufsiz, tid;
2352
2353 /* XXX locking */
2354 addba_stop_timeout(tap);
2355 if (status == IEEE80211_STATUS_SUCCESS) {
2356 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2357 /* XXX override our request? */
2358 tap->txa_wnd = (bufsiz == 0) ?
2359 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
2360 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2361 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
2362 tap->txa_attempts = 0;
2363 /* TODO: this should be a vap flag */
2364 if ((vap->iv_htcaps & IEEE80211_HTC_TX_AMSDU_AMPDU) &&
2365 (ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
2366 (_IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU)))
2367 tap->txa_flags |= IEEE80211_AGGR_AMSDU;
2368 else
2369 tap->txa_flags &= ~IEEE80211_AGGR_AMSDU;
2370 } else {
2371 /* mark tid so we don't try again */
2372 tap->txa_flags |= IEEE80211_AGGR_NAK;
2373 }
2374 return 1;
2375 }
2376
2377 /*
2378 * Default method for stopping A-MPDU tx aggregation.
2379 * Any timer is cleared and we drain any pending frames.
2380 */
2381 static void
ieee80211_addba_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2382 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
2383 {
2384 /* XXX locking */
2385 addba_stop_timeout(tap);
2386 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
2387 /* XXX clear aggregation queue */
2388 tap->txa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_AMSDU);
2389 }
2390 tap->txa_attempts = 0;
2391 }
2392
2393 /*
2394 * Process a received action frame using the default aggregation
2395 * policy. We intercept ADDBA-related frames and use them to
2396 * update our aggregation state. All other frames are passed up
2397 * for processing by ieee80211_recv_action.
2398 */
2399 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)2400 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
2401 const struct ieee80211_frame *wh,
2402 const uint8_t *frm, const uint8_t *efrm)
2403 {
2404 struct ieee80211com *ic = ni->ni_ic;
2405 struct ieee80211vap *vap = ni->ni_vap;
2406 struct ieee80211_rx_ampdu *rap;
2407 uint8_t dialogtoken;
2408 uint16_t baparamset, batimeout, baseqctl;
2409 uint16_t args[5];
2410 int tid;
2411
2412 dialogtoken = frm[2];
2413 baparamset = le16dec(frm+3);
2414 batimeout = le16dec(frm+5);
2415 baseqctl = le16dec(frm+7);
2416
2417 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2418
2419 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2420 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
2421 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d amsdu %d",
2422 dialogtoken, baparamset,
2423 tid, _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ),
2424 batimeout,
2425 _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_START),
2426 _IEEE80211_MASKSHIFT(baseqctl, IEEE80211_BASEQ_FRAG),
2427 _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU));
2428
2429 rap = &ni->ni_rx_ampdu[tid];
2430
2431 /* Send ADDBA response */
2432 args[0] = dialogtoken;
2433 /*
2434 * NB: We ack only if the sta associated with HT and
2435 * the ap is configured to do AMPDU rx (the latter
2436 * violates the 11n spec and is mostly for testing).
2437 */
2438 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
2439 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
2440 /* XXX TODO: handle ampdu_rx_start failure */
2441 ic->ic_ampdu_rx_start(ni, rap,
2442 baparamset, batimeout, baseqctl);
2443
2444 args[1] = IEEE80211_STATUS_SUCCESS;
2445 } else {
2446 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2447 ni, "reject ADDBA request: %s",
2448 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
2449 "administratively disabled" :
2450 "not negotiated for station");
2451 vap->iv_stats.is_addba_reject++;
2452 args[1] = IEEE80211_STATUS_UNSPECIFIED;
2453 }
2454 /* XXX honor rap flags? */
2455 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2456 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAPS_TID)
2457 | _IEEE80211_SHIFTMASK(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
2458 ;
2459
2460 /*
2461 * TODO: we're out of iv_flags_ht fields; once
2462 * this is extended we should make this configurable.
2463 */
2464 if ((baparamset & IEEE80211_BAPS_AMSDU) &&
2465 (ni->ni_flags & IEEE80211_NODE_AMSDU_RX) &&
2466 (vap->iv_htcaps & IEEE80211_HTC_RX_AMSDU_AMPDU))
2467 args[2] |= IEEE80211_BAPS_AMSDU;
2468
2469 args[3] = 0;
2470 args[4] = 0;
2471 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2472 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
2473 return 0;
2474 }
2475
2476 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)2477 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
2478 const struct ieee80211_frame *wh,
2479 const uint8_t *frm, const uint8_t *efrm)
2480 {
2481 struct ieee80211com *ic = ni->ni_ic;
2482 struct ieee80211vap *vap = ni->ni_vap;
2483 struct ieee80211_tx_ampdu *tap;
2484 uint8_t dialogtoken, policy;
2485 uint16_t baparamset, batimeout, code;
2486 int tid, bufsiz;
2487 int amsdu;
2488
2489 dialogtoken = frm[2];
2490 code = le16dec(frm+3);
2491 baparamset = le16dec(frm+5);
2492 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_TID);
2493 bufsiz = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_BUFSIZ);
2494 policy = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_POLICY);
2495 amsdu = !! _IEEE80211_MASKSHIFT(baparamset, IEEE80211_BAPS_AMSDU);
2496 batimeout = le16dec(frm+7);
2497
2498 tap = &ni->ni_tx_ampdu[tid];
2499 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
2500 IEEE80211_DISCARD_MAC(vap,
2501 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2502 ni->ni_macaddr, "ADDBA response",
2503 "no pending ADDBA, tid %d dialogtoken %u "
2504 "code %d", tid, dialogtoken, code);
2505 vap->iv_stats.is_addba_norequest++;
2506 return 0;
2507 }
2508 if (dialogtoken != tap->txa_token) {
2509 IEEE80211_DISCARD_MAC(vap,
2510 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2511 ni->ni_macaddr, "ADDBA response",
2512 "dialogtoken mismatch: waiting for %d, "
2513 "received %d, tid %d code %d",
2514 tap->txa_token, dialogtoken, tid, code);
2515 vap->iv_stats.is_addba_badtoken++;
2516 return 0;
2517 }
2518 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
2519 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
2520 IEEE80211_DISCARD_MAC(vap,
2521 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2522 ni->ni_macaddr, "ADDBA response",
2523 "policy mismatch: expecting %s, "
2524 "received %s, tid %d code %d",
2525 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
2526 policy, tid, code);
2527 vap->iv_stats.is_addba_badpolicy++;
2528 return 0;
2529 }
2530 #if 0
2531 /* XXX we take MIN in ieee80211_addba_response */
2532 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
2533 IEEE80211_DISCARD_MAC(vap,
2534 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2535 ni->ni_macaddr, "ADDBA response",
2536 "BA window too large: max %d, "
2537 "received %d, tid %d code %d",
2538 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
2539 vap->iv_stats.is_addba_badbawinsize++;
2540 return 0;
2541 }
2542 #endif
2543
2544 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2545 "recv ADDBA response: dialogtoken %u code %d "
2546 "baparamset 0x%x (tid %d bufsiz %d amsdu %d) batimeout %d",
2547 dialogtoken, code, baparamset, tid,
2548 bufsiz,
2549 amsdu,
2550 batimeout);
2551 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
2552 return 0;
2553 }
2554
2555 static int
ht_recv_action_ba_delba(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2556 ht_recv_action_ba_delba(struct ieee80211_node *ni,
2557 const struct ieee80211_frame *wh,
2558 const uint8_t *frm, const uint8_t *efrm)
2559 {
2560 struct ieee80211com *ic = ni->ni_ic;
2561 struct ieee80211_rx_ampdu *rap;
2562 struct ieee80211_tx_ampdu *tap;
2563 uint16_t baparamset, code;
2564 int tid;
2565
2566 baparamset = le16dec(frm+2);
2567 code = le16dec(frm+4);
2568
2569 tid = _IEEE80211_MASKSHIFT(baparamset, IEEE80211_DELBAPS_TID);
2570
2571 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2572 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
2573 "code %d", baparamset, tid,
2574 _IEEE80211_MASKSHIFT(baparamset, IEEE80211_DELBAPS_INIT), code);
2575
2576 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
2577 tap = &ni->ni_tx_ampdu[tid];
2578 ic->ic_addba_stop(ni, tap);
2579 } else {
2580 rap = &ni->ni_rx_ampdu[tid];
2581 ic->ic_ampdu_rx_stop(ni, rap);
2582 }
2583 return 0;
2584 }
2585
2586 static int
ht_recv_action_ht_txchwidth(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2587 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
2588 const struct ieee80211_frame *wh,
2589 const uint8_t *frm, const uint8_t *efrm)
2590 {
2591 int chw;
2592
2593 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
2594
2595 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2596 "%s: HT txchwidth, width %d%s",
2597 __func__, chw, ni->ni_chw != chw ? "*" : "");
2598 if (chw != ni->ni_chw) {
2599 /* XXX does this need to change the ht40 station count? */
2600 ni->ni_chw = chw;
2601 /* XXX notify on change */
2602 }
2603 return 0;
2604 }
2605
2606 static int
ht_recv_action_ht_mimopwrsave(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2607 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2608 const struct ieee80211_frame *wh,
2609 const uint8_t *frm, const uint8_t *efrm)
2610 {
2611 const struct ieee80211_action_ht_mimopowersave *mps =
2612 (const struct ieee80211_action_ht_mimopowersave *) frm;
2613
2614 /* XXX check iv_htcaps */
2615 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2616 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2617 else
2618 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2619 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2620 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2621 else
2622 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2623 /* XXX notify on change */
2624 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2625 "%s: HT MIMO PS (%s%s)", __func__,
2626 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2627 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2628 );
2629 return 0;
2630 }
2631
2632 /*
2633 * Transmit processing.
2634 */
2635
2636 /*
2637 * Check if A-MPDU should be requested/enabled for a stream.
2638 * We require a traffic rate above a per-AC threshold and we
2639 * also handle backoff from previous failed attempts.
2640 *
2641 * Drivers may override this method to bring in information
2642 * such as link state conditions in making the decision.
2643 */
2644 static int
ieee80211_ampdu_enable(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2645 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2646 struct ieee80211_tx_ampdu *tap)
2647 {
2648 struct ieee80211vap *vap = ni->ni_vap;
2649
2650 if (tap->txa_avgpps <
2651 vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
2652 return 0;
2653 /* XXX check rssi? */
2654 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2655 ieee80211_time_after(ticks, tap->txa_nextrequest)) {
2656 /*
2657 * Don't retry too often; txa_nextrequest is set
2658 * to the minimum interval we'll retry after
2659 * ieee80211_addba_maxtries failed attempts are made.
2660 */
2661 return 0;
2662 }
2663 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2664 "enable AMPDU on tid %d (%s), avgpps %d pkts %d attempt %d",
2665 tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
2666 tap->txa_avgpps, tap->txa_pkts, tap->txa_attempts);
2667 return 1;
2668 }
2669
2670 /*
2671 * Request A-MPDU tx aggregation. Setup local state and
2672 * issue an ADDBA request. BA use will only happen after
2673 * the other end replies with ADDBA response.
2674 */
2675 int
ieee80211_ampdu_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2676 ieee80211_ampdu_request(struct ieee80211_node *ni,
2677 struct ieee80211_tx_ampdu *tap)
2678 {
2679 struct ieee80211com *ic = ni->ni_ic;
2680 uint16_t args[5];
2681 int tid, dialogtoken;
2682 static int tokens = 0; /* XXX */
2683
2684 /* XXX locking */
2685 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2686 /* do deferred setup of state */
2687 ampdu_tx_setup(tap);
2688 }
2689 /* XXX hack for not doing proper locking */
2690 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2691
2692 dialogtoken = (tokens+1) % 63; /* XXX */
2693 tid = tap->txa_tid;
2694
2695 /*
2696 * XXX TODO: This is racy with any other parallel TX going on. :(
2697 */
2698 tap->txa_start = ni->ni_txseqs[tid];
2699
2700 args[0] = dialogtoken;
2701 args[1] = 0; /* NB: status code not used */
2702 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2703 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAPS_TID)
2704 | _IEEE80211_SHIFTMASK(IEEE80211_AGGR_BAWMAX,
2705 IEEE80211_BAPS_BUFSIZ)
2706 ;
2707
2708 /* XXX TODO: this should be a flag, not iv_htcaps */
2709 if ((ni->ni_flags & IEEE80211_NODE_AMSDU_TX) &&
2710 (ni->ni_vap->iv_htcaps & IEEE80211_HTC_TX_AMSDU_AMPDU))
2711 args[2] |= IEEE80211_BAPS_AMSDU;
2712
2713 args[3] = 0; /* batimeout */
2714 /* NB: do first so there's no race against reply */
2715 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2716 /* unable to setup state, don't make request */
2717 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2718 ni, "%s: could not setup BA stream for TID %d AC %d",
2719 __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
2720 /* defer next try so we don't slam the driver with requests */
2721 tap->txa_attempts = ieee80211_addba_maxtries;
2722 /* NB: check in case driver wants to override */
2723 if (tap->txa_nextrequest <= ticks)
2724 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2725 return 0;
2726 }
2727 tokens = dialogtoken; /* allocate token */
2728 /* NB: after calling ic_addba_request so driver can set txa_start */
2729 args[4] = _IEEE80211_SHIFTMASK(tap->txa_start, IEEE80211_BASEQ_START)
2730 | _IEEE80211_SHIFTMASK(0, IEEE80211_BASEQ_FRAG)
2731 ;
2732 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2733 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2734 }
2735
2736 /*
2737 * Terminate an AMPDU tx stream. State is reclaimed
2738 * and the peer notified with a DelBA Action frame.
2739 */
2740 void
ieee80211_ampdu_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int reason)2741 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2742 int reason)
2743 {
2744 struct ieee80211com *ic = ni->ni_ic;
2745 struct ieee80211vap *vap = ni->ni_vap;
2746 uint16_t args[4];
2747
2748 /* XXX locking */
2749 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2750 if (IEEE80211_AMPDU_RUNNING(tap)) {
2751 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2752 ni, "%s: stop BA stream for TID %d (reason: %d (%s))",
2753 __func__, tap->txa_tid, reason,
2754 ieee80211_reason_to_string(reason));
2755 vap->iv_stats.is_ampdu_stop++;
2756
2757 ic->ic_addba_stop(ni, tap);
2758 args[0] = tap->txa_tid;
2759 args[1] = IEEE80211_DELBAPS_INIT;
2760 args[2] = reason; /* XXX reason code */
2761 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2762 IEEE80211_ACTION_BA_DELBA, args);
2763 } else {
2764 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2765 ni, "%s: BA stream for TID %d not running "
2766 "(reason: %d (%s))", __func__, tap->txa_tid, reason,
2767 ieee80211_reason_to_string(reason));
2768 vap->iv_stats.is_ampdu_stop_failed++;
2769 }
2770 }
2771
2772 /* XXX */
2773 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
2774
2775 static void
bar_timeout(void * arg)2776 bar_timeout(void *arg)
2777 {
2778 struct ieee80211_tx_ampdu *tap = arg;
2779 struct ieee80211_node *ni = tap->txa_ni;
2780
2781 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2782 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2783
2784 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2785 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2786 tap->txa_tid, tap->txa_flags, tap->txa_attempts);
2787
2788 /* guard against race with bar_tx_complete */
2789 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2790 return;
2791 /* XXX ? */
2792 if (tap->txa_attempts >= ieee80211_bar_maxtries) {
2793 struct ieee80211com *ic = ni->ni_ic;
2794
2795 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
2796 /*
2797 * If (at least) the last BAR TX timeout was due to
2798 * an ieee80211_send_bar() failures, then we need
2799 * to make sure we notify the driver that a BAR
2800 * TX did occur and fail. This gives the driver
2801 * a chance to undo any queue pause that may
2802 * have occurred.
2803 */
2804 ic->ic_bar_response(ni, tap, 1);
2805 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2806 } else {
2807 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
2808 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
2809 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2810 ni, "%s: failed to TX, starting timer\n",
2811 __func__);
2812 /*
2813 * If ieee80211_send_bar() fails here, the
2814 * timer may have stopped and/or the pending
2815 * flag may be clear. Because of this,
2816 * fake the BARPEND and reset the timer.
2817 * A retransmission attempt will then occur
2818 * during the next timeout.
2819 */
2820 /* XXX locking */
2821 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2822 bar_start_timer(tap);
2823 }
2824 }
2825 }
2826
2827 static void
bar_start_timer(struct ieee80211_tx_ampdu * tap)2828 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2829 {
2830 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2831 tap->txa_ni,
2832 "%s: called",
2833 __func__);
2834 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2835 }
2836
2837 static void
bar_stop_timer(struct ieee80211_tx_ampdu * tap)2838 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2839 {
2840 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2841 tap->txa_ni,
2842 "%s: called",
2843 __func__);
2844 callout_stop(&tap->txa_timer);
2845 }
2846
2847 static void
bar_tx_complete(struct ieee80211_node * ni,void * arg,int status)2848 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2849 {
2850 struct ieee80211_tx_ampdu *tap = arg;
2851
2852 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2853 ni, "%s: tid %u flags 0x%x pending %d status %d",
2854 __func__, tap->txa_tid, tap->txa_flags,
2855 callout_pending(&tap->txa_timer), status);
2856
2857 ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
2858 /* XXX locking */
2859 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2860 callout_pending(&tap->txa_timer)) {
2861 struct ieee80211com *ic = ni->ni_ic;
2862
2863 if (status == 0) /* ACK'd */
2864 bar_stop_timer(tap);
2865 ic->ic_bar_response(ni, tap, status);
2866 /* NB: just let timer expire so we pace requests */
2867 }
2868 }
2869
2870 static void
ieee80211_bar_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status)2871 ieee80211_bar_response(struct ieee80211_node *ni,
2872 struct ieee80211_tx_ampdu *tap, int status)
2873 {
2874
2875 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2876 tap->txa_ni,
2877 "%s: called",
2878 __func__);
2879 if (status == 0) { /* got ACK */
2880 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2881 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2882 tap->txa_start,
2883 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2884 tap->txa_qframes, tap->txa_seqpending,
2885 tap->txa_tid);
2886
2887 /* NB: timer already stopped in bar_tx_complete */
2888 tap->txa_start = tap->txa_seqpending;
2889 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2890 }
2891 }
2892
2893 /*
2894 * Transmit a BAR frame to the specified node. The
2895 * BAR contents are drawn from the supplied aggregation
2896 * state associated with the node.
2897 *
2898 * NB: we only handle immediate ACK w/ compressed bitmap.
2899 */
2900 int
ieee80211_send_bar(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,ieee80211_seq seq)2901 ieee80211_send_bar(struct ieee80211_node *ni,
2902 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2903 {
2904 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2905 struct ieee80211vap *vap = ni->ni_vap;
2906 struct ieee80211com *ic = ni->ni_ic;
2907 struct ieee80211_frame_bar *bar;
2908 struct mbuf *m;
2909 uint16_t barctl, barseqctl;
2910 uint8_t *frm;
2911 int tid, ret;
2912
2913
2914 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2915 tap->txa_ni,
2916 "%s: called",
2917 __func__);
2918
2919 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2920 /* no ADDBA response, should not happen */
2921 /* XXX stat+msg */
2922 return EINVAL;
2923 }
2924 /* XXX locking */
2925 bar_stop_timer(tap);
2926
2927 ieee80211_ref_node(ni);
2928
2929 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2930 if (m == NULL)
2931 senderr(ENOMEM, is_tx_nobuf);
2932
2933 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2934 m_freem(m);
2935 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2936 /* NOTREACHED */
2937 }
2938
2939 bar = mtod(m, struct ieee80211_frame_bar *);
2940 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2941 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2942 bar->i_fc[1] = 0;
2943 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2944 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2945
2946 tid = tap->txa_tid;
2947 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2948 0 : IEEE80211_BAR_NOACK)
2949 | IEEE80211_BAR_COMP
2950 | _IEEE80211_SHIFTMASK(tid, IEEE80211_BAR_TID)
2951 ;
2952 barseqctl = _IEEE80211_SHIFTMASK(seq, IEEE80211_BAR_SEQ_START);
2953 /* NB: known to have proper alignment */
2954 bar->i_ctl = htole16(barctl);
2955 bar->i_seq = htole16(barseqctl);
2956 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2957
2958 M_WME_SETAC(m, WME_AC_VO);
2959
2960 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2961
2962 /* XXX locking */
2963 /* init/bump attempts counter */
2964 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2965 tap->txa_attempts = 1;
2966 else
2967 tap->txa_attempts++;
2968 tap->txa_seqpending = seq;
2969 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2970
2971 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2972 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2973 tid, barctl, seq, tap->txa_attempts);
2974
2975 /*
2976 * ic_raw_xmit will free the node reference
2977 * regardless of queue/TX success or failure.
2978 */
2979 IEEE80211_TX_LOCK(ic);
2980 ret = ieee80211_raw_output(vap, ni, m, NULL);
2981 IEEE80211_TX_UNLOCK(ic);
2982 if (ret != 0) {
2983 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2984 ni, "send BAR: failed: (ret = %d)\n",
2985 ret);
2986 /* xmit failed, clear state flag */
2987 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2988 vap->iv_stats.is_ampdu_bar_tx_fail++;
2989 return ret;
2990 }
2991 /* XXX hack against tx complete happening before timer is started */
2992 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2993 bar_start_timer(tap);
2994 return 0;
2995 bad:
2996 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2997 tap->txa_ni,
2998 "%s: bad! ret=%d",
2999 __func__, ret);
3000 vap->iv_stats.is_ampdu_bar_tx_fail++;
3001 ieee80211_free_node(ni);
3002 return ret;
3003 #undef senderr
3004 }
3005
3006 static int
ht_action_output(struct ieee80211_node * ni,struct mbuf * m)3007 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
3008 {
3009 struct ieee80211_bpf_params params;
3010
3011 memset(¶ms, 0, sizeof(params));
3012 params.ibp_pri = WME_AC_VO;
3013 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
3014 /* NB: we know all frames are unicast */
3015 params.ibp_try0 = ni->ni_txparms->maxretry;
3016 params.ibp_power = ni->ni_txpower;
3017 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
3018 ¶ms);
3019 }
3020
3021 #define ADDSHORT(frm, v) do { \
3022 frm[0] = (v) & 0xff; \
3023 frm[1] = (v) >> 8; \
3024 frm += 2; \
3025 } while (0)
3026
3027 /*
3028 * Send an action management frame. The arguments are stuff
3029 * into a frame without inspection; the caller is assumed to
3030 * prepare them carefully (e.g. based on the aggregation state).
3031 */
3032 static int
ht_send_action_ba_addba(struct ieee80211_node * ni,int category,int action,void * arg0)3033 ht_send_action_ba_addba(struct ieee80211_node *ni,
3034 int category, int action, void *arg0)
3035 {
3036 struct ieee80211vap *vap = ni->ni_vap;
3037 struct ieee80211com *ic = ni->ni_ic;
3038 uint16_t *args = arg0;
3039 struct mbuf *m;
3040 uint8_t *frm;
3041
3042 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3043 "send ADDBA %s: dialogtoken %d status %d "
3044 "baparamset 0x%x (tid %d amsdu %d) batimeout 0x%x baseqctl 0x%x",
3045 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
3046 "request" : "response", args[0], args[1], args[2],
3047 _IEEE80211_MASKSHIFT(args[2], IEEE80211_BAPS_TID),
3048 _IEEE80211_MASKSHIFT(args[2], IEEE80211_BAPS_AMSDU),
3049 args[3], args[4]);
3050
3051 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3052 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3053 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3054 ieee80211_ref_node(ni);
3055
3056 m = ieee80211_getmgtframe(&frm,
3057 ic->ic_headroom + sizeof(struct ieee80211_frame),
3058 sizeof(uint16_t) /* action+category */
3059 /* XXX may action payload */
3060 + sizeof(struct ieee80211_action_ba_addbaresponse)
3061 );
3062 if (m != NULL) {
3063 *frm++ = category;
3064 *frm++ = action;
3065 *frm++ = args[0]; /* dialog token */
3066 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
3067 ADDSHORT(frm, args[1]); /* status code */
3068 ADDSHORT(frm, args[2]); /* baparamset */
3069 ADDSHORT(frm, args[3]); /* batimeout */
3070 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
3071 ADDSHORT(frm, args[4]); /* baseqctl */
3072 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3073 return ht_action_output(ni, m);
3074 } else {
3075 vap->iv_stats.is_tx_nobuf++;
3076 ieee80211_free_node(ni);
3077 return ENOMEM;
3078 }
3079 }
3080
3081 static int
ht_send_action_ba_delba(struct ieee80211_node * ni,int category,int action,void * arg0)3082 ht_send_action_ba_delba(struct ieee80211_node *ni,
3083 int category, int action, void *arg0)
3084 {
3085 struct ieee80211vap *vap = ni->ni_vap;
3086 struct ieee80211com *ic = ni->ni_ic;
3087 uint16_t *args = arg0;
3088 struct mbuf *m;
3089 uint16_t baparamset;
3090 uint8_t *frm;
3091
3092 baparamset = _IEEE80211_SHIFTMASK(args[0], IEEE80211_DELBAPS_TID)
3093 | args[1]
3094 ;
3095 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3096 "send DELBA action: tid %d, initiator %d reason %d (%s)",
3097 args[0], args[1], args[2], ieee80211_reason_to_string(args[2]));
3098
3099 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3100 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3101 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3102 ieee80211_ref_node(ni);
3103
3104 m = ieee80211_getmgtframe(&frm,
3105 ic->ic_headroom + sizeof(struct ieee80211_frame),
3106 sizeof(uint16_t) /* action+category */
3107 /* XXX may action payload */
3108 + sizeof(struct ieee80211_action_ba_addbaresponse)
3109 );
3110 if (m != NULL) {
3111 *frm++ = category;
3112 *frm++ = action;
3113 ADDSHORT(frm, baparamset);
3114 ADDSHORT(frm, args[2]); /* reason code */
3115 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3116 return ht_action_output(ni, m);
3117 } else {
3118 vap->iv_stats.is_tx_nobuf++;
3119 ieee80211_free_node(ni);
3120 return ENOMEM;
3121 }
3122 }
3123
3124 static int
ht_send_action_ht_txchwidth(struct ieee80211_node * ni,int category,int action,void * arg0)3125 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
3126 int category, int action, void *arg0)
3127 {
3128 struct ieee80211vap *vap = ni->ni_vap;
3129 struct ieee80211com *ic = ni->ni_ic;
3130 struct mbuf *m;
3131 uint8_t *frm;
3132
3133 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
3134 "send HT txchwidth: width %d",
3135 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
3136
3137 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
3138 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
3139 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
3140 ieee80211_ref_node(ni);
3141
3142 m = ieee80211_getmgtframe(&frm,
3143 ic->ic_headroom + sizeof(struct ieee80211_frame),
3144 sizeof(uint16_t) /* action+category */
3145 /* XXX may action payload */
3146 + sizeof(struct ieee80211_action_ba_addbaresponse)
3147 );
3148 if (m != NULL) {
3149 *frm++ = category;
3150 *frm++ = action;
3151 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
3152 IEEE80211_A_HT_TXCHWIDTH_2040 :
3153 IEEE80211_A_HT_TXCHWIDTH_20;
3154 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3155 return ht_action_output(ni, m);
3156 } else {
3157 vap->iv_stats.is_tx_nobuf++;
3158 ieee80211_free_node(ni);
3159 return ENOMEM;
3160 }
3161 }
3162 #undef ADDSHORT
3163
3164 /*
3165 * Construct the MCS bit mask for inclusion in an HT capabilities
3166 * information element.
3167 */
3168 static void
ieee80211_set_mcsset(struct ieee80211com * ic,uint8_t * frm)3169 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
3170 {
3171 int i;
3172 uint8_t txparams;
3173
3174 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
3175 ("ic_rxstream %d out of range", ic->ic_rxstream));
3176 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
3177 ("ic_txstream %d out of range", ic->ic_txstream));
3178
3179 for (i = 0; i < ic->ic_rxstream * 8; i++)
3180 setbit(frm, i);
3181 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
3182 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
3183 setbit(frm, 32);
3184 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
3185 if (ic->ic_rxstream >= 2) {
3186 for (i = 33; i <= 38; i++)
3187 setbit(frm, i);
3188 }
3189 if (ic->ic_rxstream >= 3) {
3190 for (i = 39; i <= 52; i++)
3191 setbit(frm, i);
3192 }
3193 if (ic->ic_txstream >= 4) {
3194 for (i = 53; i <= 76; i++)
3195 setbit(frm, i);
3196 }
3197 }
3198
3199 if (ic->ic_rxstream != ic->ic_txstream) {
3200 txparams = 0x1; /* TX MCS set defined */
3201 txparams |= 0x2; /* TX RX MCS not equal */
3202 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
3203 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
3204 txparams |= 0x16; /* TX unequal modulation sup */
3205 } else
3206 txparams = 0;
3207 frm[12] = txparams;
3208 }
3209
3210 /*
3211 * Add body of an HTCAP information element.
3212 */
3213 static uint8_t *
ieee80211_add_htcap_body(uint8_t * frm,struct ieee80211_node * ni)3214 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
3215 {
3216 #define ADDSHORT(frm, v) do { \
3217 frm[0] = (v) & 0xff; \
3218 frm[1] = (v) >> 8; \
3219 frm += 2; \
3220 } while (0)
3221 struct ieee80211com *ic = ni->ni_ic;
3222 struct ieee80211vap *vap = ni->ni_vap;
3223 uint16_t caps, extcaps;
3224 int rxmax, density;
3225
3226 /* HT capabilities */
3227 caps = vap->iv_htcaps & 0xffff;
3228 /*
3229 * Note channel width depends on whether we are operating as
3230 * a sta or not. When operating as a sta we are generating
3231 * a request based on our desired configuration. Otherwise
3232 * we are operational and the channel attributes identify
3233 * how we've been setup (which might be different if a fixed
3234 * channel is specified).
3235 */
3236 if (vap->iv_opmode == IEEE80211_M_STA) {
3237 /* override 20/40 use based on config */
3238 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
3239 caps |= IEEE80211_HTCAP_CHWIDTH40;
3240 else
3241 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3242
3243 /* Start by using the advertised settings */
3244 rxmax = _IEEE80211_MASKSHIFT(ni->ni_htparam,
3245 IEEE80211_HTCAP_MAXRXAMPDU);
3246 density = _IEEE80211_MASKSHIFT(ni->ni_htparam,
3247 IEEE80211_HTCAP_MPDUDENSITY);
3248
3249 IEEE80211_DPRINTF(vap, IEEE80211_MSG_11N,
3250 "%s: advertised rxmax=%d, density=%d, vap rxmax=%d, density=%d\n",
3251 __func__,
3252 rxmax,
3253 density,
3254 vap->iv_ampdu_rxmax,
3255 vap->iv_ampdu_density);
3256
3257 /* Cap at VAP rxmax */
3258 if (rxmax > vap->iv_ampdu_rxmax)
3259 rxmax = vap->iv_ampdu_rxmax;
3260
3261 /*
3262 * If the VAP ampdu density value greater, use that.
3263 *
3264 * (Larger density value == larger minimum gap between A-MPDU
3265 * subframes.)
3266 */
3267 if (vap->iv_ampdu_density > density)
3268 density = vap->iv_ampdu_density;
3269
3270 /*
3271 * NB: Hardware might support HT40 on some but not all
3272 * channels. We can't determine this earlier because only
3273 * after association the channel is upgraded to HT based
3274 * on the negotiated capabilities.
3275 */
3276 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
3277 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
3278 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
3279 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3280 } else {
3281 /* override 20/40 use based on current channel */
3282 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
3283 caps |= IEEE80211_HTCAP_CHWIDTH40;
3284 else
3285 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3286
3287 /* XXX TODO should it start by using advertised settings? */
3288 rxmax = vap->iv_ampdu_rxmax;
3289 density = vap->iv_ampdu_density;
3290 }
3291
3292 /* adjust short GI based on channel and config */
3293 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
3294 caps &= ~IEEE80211_HTCAP_SHORTGI20;
3295 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
3296 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
3297 caps &= ~IEEE80211_HTCAP_SHORTGI40;
3298
3299 /* adjust STBC based on receive capabilities */
3300 if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
3301 caps &= ~IEEE80211_HTCAP_RXSTBC;
3302
3303 /* adjust LDPC based on receive capabilites */
3304 if ((vap->iv_flags_ht & IEEE80211_FHT_LDPC_RX) == 0)
3305 caps &= ~IEEE80211_HTCAP_LDPC;
3306
3307 ADDSHORT(frm, caps);
3308
3309 /* HT parameters */
3310 *frm = _IEEE80211_SHIFTMASK(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
3311 | _IEEE80211_SHIFTMASK(density, IEEE80211_HTCAP_MPDUDENSITY)
3312 ;
3313 frm++;
3314
3315 /* pre-zero remainder of ie */
3316 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
3317 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
3318
3319 /* supported MCS set */
3320 /*
3321 * XXX: For sta mode the rate set should be restricted based
3322 * on the AP's capabilities, but ni_htrates isn't setup when
3323 * we're called to form an AssocReq frame so for now we're
3324 * restricted to the device capabilities.
3325 */
3326 ieee80211_set_mcsset(ni->ni_ic, frm);
3327
3328 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
3329 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
3330
3331 /* HT extended capabilities */
3332 extcaps = vap->iv_htextcaps & 0xffff;
3333
3334 ADDSHORT(frm, extcaps);
3335
3336 frm += sizeof(struct ieee80211_ie_htcap) -
3337 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
3338
3339 return frm;
3340 #undef ADDSHORT
3341 }
3342
3343 /*
3344 * Add 802.11n HT capabilities information element
3345 */
3346 uint8_t *
ieee80211_add_htcap(uint8_t * frm,struct ieee80211_node * ni)3347 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
3348 {
3349 frm[0] = IEEE80211_ELEMID_HTCAP;
3350 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
3351 return ieee80211_add_htcap_body(frm + 2, ni);
3352 }
3353
3354 /*
3355 * Non-associated probe request - add HT capabilities based on
3356 * the current channel configuration.
3357 */
3358 static uint8_t *
ieee80211_add_htcap_body_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)3359 ieee80211_add_htcap_body_ch(uint8_t *frm, struct ieee80211vap *vap,
3360 struct ieee80211_channel *c)
3361 {
3362 #define ADDSHORT(frm, v) do { \
3363 frm[0] = (v) & 0xff; \
3364 frm[1] = (v) >> 8; \
3365 frm += 2; \
3366 } while (0)
3367 struct ieee80211com *ic = vap->iv_ic;
3368 uint16_t caps, extcaps;
3369 int rxmax, density;
3370
3371 /* HT capabilities */
3372 caps = vap->iv_htcaps & 0xffff;
3373
3374 /*
3375 * We don't use this in STA mode; only in IBSS mode.
3376 * So in IBSS mode we base our HTCAP flags on the
3377 * given channel.
3378 */
3379
3380 /* override 20/40 use based on current channel */
3381 if (IEEE80211_IS_CHAN_HT40(c))
3382 caps |= IEEE80211_HTCAP_CHWIDTH40;
3383 else
3384 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
3385
3386 /* Use the currently configured values */
3387 rxmax = vap->iv_ampdu_rxmax;
3388 density = vap->iv_ampdu_density;
3389
3390 /* adjust short GI based on channel and config */
3391 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
3392 caps &= ~IEEE80211_HTCAP_SHORTGI20;
3393 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
3394 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
3395 caps &= ~IEEE80211_HTCAP_SHORTGI40;
3396 ADDSHORT(frm, caps);
3397
3398 /* HT parameters */
3399 *frm = _IEEE80211_SHIFTMASK(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
3400 | _IEEE80211_SHIFTMASK(density, IEEE80211_HTCAP_MPDUDENSITY)
3401 ;
3402 frm++;
3403
3404 /* pre-zero remainder of ie */
3405 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
3406 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
3407
3408 /* supported MCS set */
3409 /*
3410 * XXX: For sta mode the rate set should be restricted based
3411 * on the AP's capabilities, but ni_htrates isn't setup when
3412 * we're called to form an AssocReq frame so for now we're
3413 * restricted to the device capabilities.
3414 */
3415 ieee80211_set_mcsset(ic, frm);
3416
3417 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
3418 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
3419
3420 /* HT extended capabilities */
3421 extcaps = vap->iv_htextcaps & 0xffff;
3422
3423 ADDSHORT(frm, extcaps);
3424
3425 frm += sizeof(struct ieee80211_ie_htcap) -
3426 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
3427
3428 return frm;
3429 #undef ADDSHORT
3430 }
3431
3432 /*
3433 * Add 802.11n HT capabilities information element
3434 */
3435 uint8_t *
ieee80211_add_htcap_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)3436 ieee80211_add_htcap_ch(uint8_t *frm, struct ieee80211vap *vap,
3437 struct ieee80211_channel *c)
3438 {
3439 frm[0] = IEEE80211_ELEMID_HTCAP;
3440 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
3441 return ieee80211_add_htcap_body_ch(frm + 2, vap, c);
3442 }
3443
3444 /*
3445 * Add Broadcom OUI wrapped standard HTCAP ie; this is
3446 * used for compatibility w/ pre-draft implementations.
3447 */
3448 uint8_t *
ieee80211_add_htcap_vendor(uint8_t * frm,struct ieee80211_node * ni)3449 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
3450 {
3451 frm[0] = IEEE80211_ELEMID_VENDOR;
3452 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
3453 frm[2] = (BCM_OUI >> 0) & 0xff;
3454 frm[3] = (BCM_OUI >> 8) & 0xff;
3455 frm[4] = (BCM_OUI >> 16) & 0xff;
3456 frm[5] = BCM_OUI_HTCAP;
3457 return ieee80211_add_htcap_body(frm + 6, ni);
3458 }
3459
3460 /*
3461 * Construct the MCS bit mask of basic rates
3462 * for inclusion in an HT information element.
3463 */
3464 static void
ieee80211_set_basic_htrates(uint8_t * frm,const struct ieee80211_htrateset * rs)3465 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
3466 {
3467 int i;
3468
3469 for (i = 0; i < rs->rs_nrates; i++) {
3470 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
3471 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
3472 r < IEEE80211_HTRATE_MAXSIZE) {
3473 /* NB: this assumes a particular implementation */
3474 setbit(frm, r);
3475 }
3476 }
3477 }
3478
3479 /*
3480 * Update the HTINFO ie for a beacon frame.
3481 */
3482 void
ieee80211_ht_update_beacon(struct ieee80211vap * vap,struct ieee80211_beacon_offsets * bo)3483 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
3484 struct ieee80211_beacon_offsets *bo)
3485 {
3486 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
3487 struct ieee80211_node *ni;
3488 const struct ieee80211_channel *bsschan;
3489 struct ieee80211com *ic = vap->iv_ic;
3490 struct ieee80211_ie_htinfo *ht =
3491 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
3492
3493 ni = ieee80211_ref_node(vap->iv_bss);
3494 bsschan = ni->ni_chan;
3495
3496 /* XXX only update on channel change */
3497 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
3498 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
3499 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
3500 else
3501 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
3502 if (IEEE80211_IS_CHAN_HT40U(bsschan))
3503 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
3504 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
3505 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
3506 else
3507 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
3508 if (IEEE80211_IS_CHAN_HT40(bsschan))
3509 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
3510
3511 /* protection mode */
3512 /*
3513 * XXX TODO: this uses the global flag, not the per-VAP flag.
3514 * Eventually (once the protection modes are done per-channel
3515 * rather than per-VAP) we can flip this over to be per-VAP but
3516 * using the channel protection mode.
3517 */
3518 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
3519
3520 ieee80211_free_node(ni);
3521
3522 /* XXX propagate to vendor ie's */
3523 #undef PROTMODE
3524 }
3525
3526 /*
3527 * Add body of an HTINFO information element.
3528 *
3529 * NB: We don't use struct ieee80211_ie_htinfo because we can
3530 * be called to fillin both a standard ie and a compat ie that
3531 * has a vendor OUI at the front.
3532 */
3533 static uint8_t *
ieee80211_add_htinfo_body(uint8_t * frm,struct ieee80211_node * ni)3534 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
3535 {
3536 struct ieee80211vap *vap = ni->ni_vap;
3537 struct ieee80211com *ic = ni->ni_ic;
3538
3539 /* pre-zero remainder of ie */
3540 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
3541
3542 /* primary/control channel center */
3543 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
3544
3545 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
3546 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
3547 else
3548 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
3549 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
3550 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
3551 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
3552 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
3553 else
3554 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
3555 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
3556 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
3557
3558 /*
3559 * Add current protection mode. Unlike for beacons,
3560 * this will respect the per-VAP flags.
3561 */
3562 frm[1] = vap->iv_curhtprotmode;
3563
3564 frm += 5;
3565
3566 /* basic MCS set */
3567 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
3568 frm += sizeof(struct ieee80211_ie_htinfo) -
3569 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
3570 return frm;
3571 }
3572
3573 /*
3574 * Add 802.11n HT information element.
3575 */
3576 uint8_t *
ieee80211_add_htinfo(uint8_t * frm,struct ieee80211_node * ni)3577 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
3578 {
3579 frm[0] = IEEE80211_ELEMID_HTINFO;
3580 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
3581 return ieee80211_add_htinfo_body(frm + 2, ni);
3582 }
3583
3584 /*
3585 * Add Broadcom OUI wrapped standard HTINFO ie; this is
3586 * used for compatibility w/ pre-draft implementations.
3587 */
3588 uint8_t *
ieee80211_add_htinfo_vendor(uint8_t * frm,struct ieee80211_node * ni)3589 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
3590 {
3591 frm[0] = IEEE80211_ELEMID_VENDOR;
3592 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
3593 frm[2] = (BCM_OUI >> 0) & 0xff;
3594 frm[3] = (BCM_OUI >> 8) & 0xff;
3595 frm[4] = (BCM_OUI >> 16) & 0xff;
3596 frm[5] = BCM_OUI_HTINFO;
3597 return ieee80211_add_htinfo_body(frm + 6, ni);
3598 }
3599