1 /*-
2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 #ifdef __FreeBSD__
28 __FBSDID("$FreeBSD$");
29 #endif
30
31 /*
32 * IEEE 802.11n protocol support.
33 */
34
35 #include "opt_inet.h"
36 #include "opt_wlan.h"
37
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
41 #include <sys/endian.h>
42
43 #include <sys/socket.h>
44
45 #include <net/if.h>
46 #include <net/if_var.h>
47 #include <net/if_media.h>
48 #include <net/ethernet.h>
49
50 #include <net80211/ieee80211_var.h>
51 #include <net80211/ieee80211_action.h>
52 #include <net80211/ieee80211_input.h>
53
54 /* define here, used throughout file */
55 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
56 #define SM(_v, _f) (((_v) << _f##_S) & _f)
57
58 const struct ieee80211_mcs_rates ieee80211_htrates[IEEE80211_HTRATE_MAXSIZE] = {
59 { 13, 14, 27, 30 }, /* MCS 0 */
60 { 26, 29, 54, 60 }, /* MCS 1 */
61 { 39, 43, 81, 90 }, /* MCS 2 */
62 { 52, 58, 108, 120 }, /* MCS 3 */
63 { 78, 87, 162, 180 }, /* MCS 4 */
64 { 104, 116, 216, 240 }, /* MCS 5 */
65 { 117, 130, 243, 270 }, /* MCS 6 */
66 { 130, 144, 270, 300 }, /* MCS 7 */
67 { 26, 29, 54, 60 }, /* MCS 8 */
68 { 52, 58, 108, 120 }, /* MCS 9 */
69 { 78, 87, 162, 180 }, /* MCS 10 */
70 { 104, 116, 216, 240 }, /* MCS 11 */
71 { 156, 173, 324, 360 }, /* MCS 12 */
72 { 208, 231, 432, 480 }, /* MCS 13 */
73 { 234, 260, 486, 540 }, /* MCS 14 */
74 { 260, 289, 540, 600 }, /* MCS 15 */
75 { 39, 43, 81, 90 }, /* MCS 16 */
76 { 78, 87, 162, 180 }, /* MCS 17 */
77 { 117, 130, 243, 270 }, /* MCS 18 */
78 { 156, 173, 324, 360 }, /* MCS 19 */
79 { 234, 260, 486, 540 }, /* MCS 20 */
80 { 312, 347, 648, 720 }, /* MCS 21 */
81 { 351, 390, 729, 810 }, /* MCS 22 */
82 { 390, 433, 810, 900 }, /* MCS 23 */
83 { 52, 58, 108, 120 }, /* MCS 24 */
84 { 104, 116, 216, 240 }, /* MCS 25 */
85 { 156, 173, 324, 360 }, /* MCS 26 */
86 { 208, 231, 432, 480 }, /* MCS 27 */
87 { 312, 347, 648, 720 }, /* MCS 28 */
88 { 416, 462, 864, 960 }, /* MCS 29 */
89 { 468, 520, 972, 1080 }, /* MCS 30 */
90 { 520, 578, 1080, 1200 }, /* MCS 31 */
91 { 0, 0, 12, 13 }, /* MCS 32 */
92 { 78, 87, 162, 180 }, /* MCS 33 */
93 { 104, 116, 216, 240 }, /* MCS 34 */
94 { 130, 144, 270, 300 }, /* MCS 35 */
95 { 117, 130, 243, 270 }, /* MCS 36 */
96 { 156, 173, 324, 360 }, /* MCS 37 */
97 { 195, 217, 405, 450 }, /* MCS 38 */
98 { 104, 116, 216, 240 }, /* MCS 39 */
99 { 130, 144, 270, 300 }, /* MCS 40 */
100 { 130, 144, 270, 300 }, /* MCS 41 */
101 { 156, 173, 324, 360 }, /* MCS 42 */
102 { 182, 202, 378, 420 }, /* MCS 43 */
103 { 182, 202, 378, 420 }, /* MCS 44 */
104 { 208, 231, 432, 480 }, /* MCS 45 */
105 { 156, 173, 324, 360 }, /* MCS 46 */
106 { 195, 217, 405, 450 }, /* MCS 47 */
107 { 195, 217, 405, 450 }, /* MCS 48 */
108 { 234, 260, 486, 540 }, /* MCS 49 */
109 { 273, 303, 567, 630 }, /* MCS 50 */
110 { 273, 303, 567, 630 }, /* MCS 51 */
111 { 312, 347, 648, 720 }, /* MCS 52 */
112 { 130, 144, 270, 300 }, /* MCS 53 */
113 { 156, 173, 324, 360 }, /* MCS 54 */
114 { 182, 202, 378, 420 }, /* MCS 55 */
115 { 156, 173, 324, 360 }, /* MCS 56 */
116 { 182, 202, 378, 420 }, /* MCS 57 */
117 { 208, 231, 432, 480 }, /* MCS 58 */
118 { 234, 260, 486, 540 }, /* MCS 59 */
119 { 208, 231, 432, 480 }, /* MCS 60 */
120 { 234, 260, 486, 540 }, /* MCS 61 */
121 { 260, 289, 540, 600 }, /* MCS 62 */
122 { 260, 289, 540, 600 }, /* MCS 63 */
123 { 286, 318, 594, 660 }, /* MCS 64 */
124 { 195, 217, 405, 450 }, /* MCS 65 */
125 { 234, 260, 486, 540 }, /* MCS 66 */
126 { 273, 303, 567, 630 }, /* MCS 67 */
127 { 234, 260, 486, 540 }, /* MCS 68 */
128 { 273, 303, 567, 630 }, /* MCS 69 */
129 { 312, 347, 648, 720 }, /* MCS 70 */
130 { 351, 390, 729, 810 }, /* MCS 71 */
131 { 312, 347, 648, 720 }, /* MCS 72 */
132 { 351, 390, 729, 810 }, /* MCS 73 */
133 { 390, 433, 810, 900 }, /* MCS 74 */
134 { 390, 433, 810, 900 }, /* MCS 75 */
135 { 429, 477, 891, 990 }, /* MCS 76 */
136 };
137
138 #ifdef IEEE80211_AMPDU_AGE
139 static int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
140 SYSCTL_PROC(_net_wlan, OID_AUTO, ampdu_age, CTLTYPE_INT | CTLFLAG_RW,
141 &ieee80211_ampdu_age, 0, ieee80211_sysctl_msecs_ticks, "I",
142 "AMPDU max reorder age (ms)");
143 #endif
144
145 static int ieee80211_recv_bar_ena = 1;
146 SYSCTL_INT(_net_wlan, OID_AUTO, recv_bar, CTLFLAG_RW, &ieee80211_recv_bar_ena,
147 0, "BAR frame processing (ena/dis)");
148
149 static int ieee80211_addba_timeout = -1;/* timeout for ADDBA response */
150 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_timeout, CTLTYPE_INT | CTLFLAG_RW,
151 &ieee80211_addba_timeout, 0, ieee80211_sysctl_msecs_ticks, "I",
152 "ADDBA request timeout (ms)");
153 static int ieee80211_addba_backoff = -1;/* backoff after max ADDBA requests */
154 SYSCTL_PROC(_net_wlan, OID_AUTO, addba_backoff, CTLTYPE_INT | CTLFLAG_RW,
155 &ieee80211_addba_backoff, 0, ieee80211_sysctl_msecs_ticks, "I",
156 "ADDBA request backoff (ms)");
157 static int ieee80211_addba_maxtries = 3;/* max ADDBA requests before backoff */
158 SYSCTL_INT(_net_wlan, OID_AUTO, addba_maxtries, CTLFLAG_RW,
159 &ieee80211_addba_maxtries, 0, "max ADDBA requests sent before backoff");
160
161 static int ieee80211_bar_timeout = -1; /* timeout waiting for BAR response */
162 static int ieee80211_bar_maxtries = 50;/* max BAR requests before DELBA */
163
164 static ieee80211_recv_action_func ht_recv_action_ba_addba_request;
165 static ieee80211_recv_action_func ht_recv_action_ba_addba_response;
166 static ieee80211_recv_action_func ht_recv_action_ba_delba;
167 static ieee80211_recv_action_func ht_recv_action_ht_mimopwrsave;
168 static ieee80211_recv_action_func ht_recv_action_ht_txchwidth;
169
170 static ieee80211_send_action_func ht_send_action_ba_addba;
171 static ieee80211_send_action_func ht_send_action_ba_delba;
172 static ieee80211_send_action_func ht_send_action_ht_txchwidth;
173
174 static void
ieee80211_ht_init(void)175 ieee80211_ht_init(void)
176 {
177 /*
178 * Setup HT parameters that depends on the clock frequency.
179 */
180 #ifdef IEEE80211_AMPDU_AGE
181 ieee80211_ampdu_age = msecs_to_ticks(500);
182 #endif
183 ieee80211_addba_timeout = msecs_to_ticks(250);
184 ieee80211_addba_backoff = msecs_to_ticks(10*1000);
185 ieee80211_bar_timeout = msecs_to_ticks(250);
186 /*
187 * Register action frame handlers.
188 */
189 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
190 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_recv_action_ba_addba_request);
191 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
192 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_recv_action_ba_addba_response);
193 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_BA,
194 IEEE80211_ACTION_BA_DELBA, ht_recv_action_ba_delba);
195 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
196 IEEE80211_ACTION_HT_MIMOPWRSAVE, ht_recv_action_ht_mimopwrsave);
197 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_HT,
198 IEEE80211_ACTION_HT_TXCHWIDTH, ht_recv_action_ht_txchwidth);
199
200 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
201 IEEE80211_ACTION_BA_ADDBA_REQUEST, ht_send_action_ba_addba);
202 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
203 IEEE80211_ACTION_BA_ADDBA_RESPONSE, ht_send_action_ba_addba);
204 ieee80211_send_action_register(IEEE80211_ACTION_CAT_BA,
205 IEEE80211_ACTION_BA_DELBA, ht_send_action_ba_delba);
206 ieee80211_send_action_register(IEEE80211_ACTION_CAT_HT,
207 IEEE80211_ACTION_HT_TXCHWIDTH, ht_send_action_ht_txchwidth);
208 }
209 SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_init, NULL);
210
211 static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
212 struct ieee80211_tx_ampdu *tap);
213 static int ieee80211_addba_request(struct ieee80211_node *ni,
214 struct ieee80211_tx_ampdu *tap,
215 int dialogtoken, int baparamset, int batimeout);
216 static int ieee80211_addba_response(struct ieee80211_node *ni,
217 struct ieee80211_tx_ampdu *tap,
218 int code, int baparamset, int batimeout);
219 static void ieee80211_addba_stop(struct ieee80211_node *ni,
220 struct ieee80211_tx_ampdu *tap);
221 static void null_addba_response_timeout(struct ieee80211_node *ni,
222 struct ieee80211_tx_ampdu *tap);
223
224 static void ieee80211_bar_response(struct ieee80211_node *ni,
225 struct ieee80211_tx_ampdu *tap, int status);
226 static void ampdu_tx_stop(struct ieee80211_tx_ampdu *tap);
227 static void bar_stop_timer(struct ieee80211_tx_ampdu *tap);
228 static int ampdu_rx_start(struct ieee80211_node *, struct ieee80211_rx_ampdu *,
229 int baparamset, int batimeout, int baseqctl);
230 static void ampdu_rx_stop(struct ieee80211_node *, struct ieee80211_rx_ampdu *);
231
232 void
ieee80211_ht_attach(struct ieee80211com * ic)233 ieee80211_ht_attach(struct ieee80211com *ic)
234 {
235 /* setup default aggregation policy */
236 ic->ic_recv_action = ieee80211_recv_action;
237 ic->ic_send_action = ieee80211_send_action;
238 ic->ic_ampdu_enable = ieee80211_ampdu_enable;
239 ic->ic_addba_request = ieee80211_addba_request;
240 ic->ic_addba_response = ieee80211_addba_response;
241 ic->ic_addba_response_timeout = null_addba_response_timeout;
242 ic->ic_addba_stop = ieee80211_addba_stop;
243 ic->ic_bar_response = ieee80211_bar_response;
244 ic->ic_ampdu_rx_start = ampdu_rx_start;
245 ic->ic_ampdu_rx_stop = ampdu_rx_stop;
246
247 ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
248 ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
249 }
250
251 void
ieee80211_ht_detach(struct ieee80211com * ic)252 ieee80211_ht_detach(struct ieee80211com *ic)
253 {
254 }
255
256 void
ieee80211_ht_vattach(struct ieee80211vap * vap)257 ieee80211_ht_vattach(struct ieee80211vap *vap)
258 {
259
260 /* driver can override defaults */
261 vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
262 vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
263 vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
264 vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
265 /* tx aggregation traffic thresholds */
266 vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
267 vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
268 vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
269 vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
270
271 if (vap->iv_htcaps & IEEE80211_HTC_HT) {
272 /*
273 * Device is HT capable; enable all HT-related
274 * facilities by default.
275 * XXX these choices may be too aggressive.
276 */
277 vap->iv_flags_ht |= IEEE80211_FHT_HT
278 | IEEE80211_FHT_HTCOMPAT
279 ;
280 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
281 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI20;
282 /* XXX infer from channel list? */
283 if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
284 vap->iv_flags_ht |= IEEE80211_FHT_USEHT40;
285 if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
286 vap->iv_flags_ht |= IEEE80211_FHT_SHORTGI40;
287 }
288 /* enable RIFS if capable */
289 if (vap->iv_htcaps & IEEE80211_HTC_RIFS)
290 vap->iv_flags_ht |= IEEE80211_FHT_RIFS;
291
292 /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
293 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_RX;
294 if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
295 vap->iv_flags_ht |= IEEE80211_FHT_AMPDU_TX;
296 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_RX;
297 if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
298 vap->iv_flags_ht |= IEEE80211_FHT_AMSDU_TX;
299 }
300 /* NB: disable default legacy WDS, too many issues right now */
301 if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
302 vap->iv_flags_ht &= ~IEEE80211_FHT_HT;
303 }
304
305 void
ieee80211_ht_vdetach(struct ieee80211vap * vap)306 ieee80211_ht_vdetach(struct ieee80211vap *vap)
307 {
308 }
309
310 static int
ht_getrate(struct ieee80211com * ic,int index,enum ieee80211_phymode mode,int ratetype)311 ht_getrate(struct ieee80211com *ic, int index, enum ieee80211_phymode mode,
312 int ratetype)
313 {
314 int mword, rate;
315
316 mword = ieee80211_rate2media(ic, index | IEEE80211_RATE_MCS, mode);
317 if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
318 return (0);
319 switch (ratetype) {
320 case 0:
321 rate = ieee80211_htrates[index].ht20_rate_800ns;
322 break;
323 case 1:
324 rate = ieee80211_htrates[index].ht20_rate_400ns;
325 break;
326 case 2:
327 rate = ieee80211_htrates[index].ht40_rate_800ns;
328 break;
329 default:
330 rate = ieee80211_htrates[index].ht40_rate_400ns;
331 break;
332 }
333 return (rate);
334 }
335
336 static struct printranges {
337 int minmcs;
338 int maxmcs;
339 int txstream;
340 int ratetype;
341 int htcapflags;
342 } ranges[] = {
343 { 0, 7, 1, 0, 0 },
344 { 8, 15, 2, 0, 0 },
345 { 16, 23, 3, 0, 0 },
346 { 24, 31, 4, 0, 0 },
347 { 32, 0, 1, 2, IEEE80211_HTC_TXMCS32 },
348 { 33, 38, 2, 0, IEEE80211_HTC_TXUNEQUAL },
349 { 39, 52, 3, 0, IEEE80211_HTC_TXUNEQUAL },
350 { 53, 76, 4, 0, IEEE80211_HTC_TXUNEQUAL },
351 { 0, 0, 0, 0, 0 },
352 };
353
354 static void
ht_rateprint(struct ieee80211com * ic,enum ieee80211_phymode mode,int ratetype)355 ht_rateprint(struct ieee80211com *ic, enum ieee80211_phymode mode, int ratetype)
356 {
357 int minrate, maxrate;
358 struct printranges *range;
359
360 for (range = ranges; range->txstream != 0; range++) {
361 if (ic->ic_txstream < range->txstream)
362 continue;
363 if (range->htcapflags &&
364 (ic->ic_htcaps & range->htcapflags) == 0)
365 continue;
366 if (ratetype < range->ratetype)
367 continue;
368 minrate = ht_getrate(ic, range->minmcs, mode, ratetype);
369 maxrate = ht_getrate(ic, range->maxmcs, mode, ratetype);
370 if (range->maxmcs) {
371 ic_printf(ic, "MCS %d-%d: %d%sMbps - %d%sMbps\n",
372 range->minmcs, range->maxmcs,
373 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""),
374 maxrate/2, ((maxrate & 0x1) != 0 ? ".5" : ""));
375 } else {
376 ic_printf(ic, "MCS %d: %d%sMbps\n", range->minmcs,
377 minrate/2, ((minrate & 0x1) != 0 ? ".5" : ""));
378 }
379 }
380 }
381
382 static void
ht_announce(struct ieee80211com * ic,enum ieee80211_phymode mode)383 ht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
384 {
385 const char *modestr = ieee80211_phymode_name[mode];
386
387 ic_printf(ic, "%s MCS 20MHz\n", modestr);
388 ht_rateprint(ic, mode, 0);
389 if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20) {
390 ic_printf(ic, "%s MCS 20MHz SGI\n", modestr);
391 ht_rateprint(ic, mode, 1);
392 }
393 if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
394 ic_printf(ic, "%s MCS 40MHz:\n", modestr);
395 ht_rateprint(ic, mode, 2);
396 }
397 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
398 (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)) {
399 ic_printf(ic, "%s MCS 40MHz SGI:\n", modestr);
400 ht_rateprint(ic, mode, 3);
401 }
402 }
403
404 void
ieee80211_ht_announce(struct ieee80211com * ic)405 ieee80211_ht_announce(struct ieee80211com *ic)
406 {
407
408 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
409 isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
410 ic_printf(ic, "%dT%dR\n", ic->ic_txstream, ic->ic_rxstream);
411 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
412 ht_announce(ic, IEEE80211_MODE_11NA);
413 if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
414 ht_announce(ic, IEEE80211_MODE_11NG);
415 }
416
417 static struct ieee80211_htrateset htrateset;
418
419 const struct ieee80211_htrateset *
ieee80211_get_suphtrates(struct ieee80211com * ic,const struct ieee80211_channel * c)420 ieee80211_get_suphtrates(struct ieee80211com *ic,
421 const struct ieee80211_channel *c)
422 {
423 #define ADDRATE(x) do { \
424 htrateset.rs_rates[htrateset.rs_nrates] = x; \
425 htrateset.rs_nrates++; \
426 } while (0)
427 int i;
428
429 memset(&htrateset, 0, sizeof(struct ieee80211_htrateset));
430 for (i = 0; i < ic->ic_txstream * 8; i++)
431 ADDRATE(i);
432 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
433 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32))
434 ADDRATE(32);
435 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
436 if (ic->ic_txstream >= 2) {
437 for (i = 33; i <= 38; i++)
438 ADDRATE(i);
439 }
440 if (ic->ic_txstream >= 3) {
441 for (i = 39; i <= 52; i++)
442 ADDRATE(i);
443 }
444 if (ic->ic_txstream == 4) {
445 for (i = 53; i <= 76; i++)
446 ADDRATE(i);
447 }
448 }
449 return &htrateset;
450 #undef ADDRATE
451 }
452
453 /*
454 * Receive processing.
455 */
456
457 /*
458 * Decap the encapsulated A-MSDU frames and dispatch all but
459 * the last for delivery. The last frame is returned for
460 * delivery via the normal path.
461 */
462 struct mbuf *
ieee80211_decap_amsdu(struct ieee80211_node * ni,struct mbuf * m)463 ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
464 {
465 struct ieee80211vap *vap = ni->ni_vap;
466 int framelen;
467 struct mbuf *n;
468
469 /* discard 802.3 header inserted by ieee80211_decap */
470 m_adj(m, sizeof(struct ether_header));
471
472 vap->iv_stats.is_amsdu_decap++;
473
474 for (;;) {
475 /*
476 * Decap the first frame, bust it apart from the
477 * remainder and deliver. We leave the last frame
478 * delivery to the caller (for consistency with other
479 * code paths, could also do it here).
480 */
481 m = ieee80211_decap1(m, &framelen);
482 if (m == NULL) {
483 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
484 ni->ni_macaddr, "a-msdu", "%s", "decap failed");
485 vap->iv_stats.is_amsdu_tooshort++;
486 return NULL;
487 }
488 if (m->m_pkthdr.len == framelen)
489 break;
490 n = m_split(m, framelen, M_NOWAIT);
491 if (n == NULL) {
492 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
493 ni->ni_macaddr, "a-msdu",
494 "%s", "unable to split encapsulated frames");
495 vap->iv_stats.is_amsdu_split++;
496 m_freem(m); /* NB: must reclaim */
497 return NULL;
498 }
499 vap->iv_deliver_data(vap, ni, m);
500
501 /*
502 * Remove frame contents; each intermediate frame
503 * is required to be aligned to a 4-byte boundary.
504 */
505 m = n;
506 m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
507 }
508 return m; /* last delivered by caller */
509 }
510
511 /*
512 * Purge all frames in the A-MPDU re-order queue.
513 */
514 static void
ampdu_rx_purge(struct ieee80211_rx_ampdu * rap)515 ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
516 {
517 struct mbuf *m;
518 int i;
519
520 for (i = 0; i < rap->rxa_wnd; i++) {
521 m = rap->rxa_m[i];
522 if (m != NULL) {
523 rap->rxa_m[i] = NULL;
524 rap->rxa_qbytes -= m->m_pkthdr.len;
525 m_freem(m);
526 if (--rap->rxa_qframes == 0)
527 break;
528 }
529 }
530 KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
531 ("lost %u data, %u frames on ampdu rx q",
532 rap->rxa_qbytes, rap->rxa_qframes));
533 }
534
535 /*
536 * Start A-MPDU rx/re-order processing for the specified TID.
537 */
538 static int
ampdu_rx_start(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,int baparamset,int batimeout,int baseqctl)539 ampdu_rx_start(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap,
540 int baparamset, int batimeout, int baseqctl)
541 {
542 int bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
543
544 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
545 /*
546 * AMPDU previously setup and not terminated with a DELBA,
547 * flush the reorder q's in case anything remains.
548 */
549 ampdu_rx_purge(rap);
550 }
551 memset(rap, 0, sizeof(*rap));
552 rap->rxa_wnd = (bufsiz == 0) ?
553 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
554 rap->rxa_start = MS(baseqctl, IEEE80211_BASEQ_START);
555 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
556
557 return 0;
558 }
559
560 /*
561 * Public function; manually setup the RX ampdu state.
562 */
563 int
ieee80211_ampdu_rx_start_ext(struct ieee80211_node * ni,int tid,int seq,int baw)564 ieee80211_ampdu_rx_start_ext(struct ieee80211_node *ni, int tid, int seq, int baw)
565 {
566 struct ieee80211_rx_ampdu *rap;
567
568 /* XXX TODO: sanity check tid, seq, baw */
569
570 rap = &ni->ni_rx_ampdu[tid];
571
572 if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
573 /*
574 * AMPDU previously setup and not terminated with a DELBA,
575 * flush the reorder q's in case anything remains.
576 */
577 ampdu_rx_purge(rap);
578 }
579
580 memset(rap, 0, sizeof(*rap));
581 rap->rxa_wnd = (baw== 0) ?
582 IEEE80211_AGGR_BAWMAX : min(baw, IEEE80211_AGGR_BAWMAX);
583 rap->rxa_start = seq;
584 rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
585
586 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
587 "%s: tid=%d, start=%d, wnd=%d, flags=0x%08x\n",
588 __func__,
589 tid,
590 seq,
591 rap->rxa_wnd,
592 rap->rxa_flags);
593
594 return 0;
595 }
596
597 /*
598 * Stop A-MPDU rx processing for the specified TID.
599 */
600 static void
ampdu_rx_stop(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)601 ampdu_rx_stop(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
602 {
603
604 ampdu_rx_purge(rap);
605 rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
606 }
607
608 /*
609 * Dispatch a frame from the A-MPDU reorder queue. The
610 * frame is fed back into ieee80211_input marked with an
611 * M_AMPDU_MPDU flag so it doesn't come back to us (it also
612 * permits ieee80211_input to optimize re-processing).
613 */
614 static __inline void
ampdu_dispatch(struct ieee80211_node * ni,struct mbuf * m)615 ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
616 {
617 m->m_flags |= M_AMPDU_MPDU; /* bypass normal processing */
618 /* NB: rssi and noise are ignored w/ M_AMPDU_MPDU set */
619 (void) ieee80211_input(ni, m, 0, 0);
620 }
621
622 /*
623 * Dispatch as many frames as possible from the re-order queue.
624 * Frames will always be "at the front"; we process all frames
625 * up to the first empty slot in the window. On completion we
626 * cleanup state if there are still pending frames in the current
627 * BA window. We assume the frame at slot 0 is already handled
628 * by the caller; we always start at slot 1.
629 */
630 static void
ampdu_rx_dispatch(struct ieee80211_rx_ampdu * rap,struct ieee80211_node * ni)631 ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
632 {
633 struct ieee80211vap *vap = ni->ni_vap;
634 struct mbuf *m;
635 int i;
636
637 /* flush run of frames */
638 for (i = 1; i < rap->rxa_wnd; i++) {
639 m = rap->rxa_m[i];
640 if (m == NULL)
641 break;
642 rap->rxa_m[i] = NULL;
643 rap->rxa_qbytes -= m->m_pkthdr.len;
644 rap->rxa_qframes--;
645
646 ampdu_dispatch(ni, m);
647 }
648 /*
649 * If frames remain, copy the mbuf pointers down so
650 * they correspond to the offsets in the new window.
651 */
652 if (rap->rxa_qframes != 0) {
653 int n = rap->rxa_qframes, j;
654 for (j = i+1; j < rap->rxa_wnd; j++) {
655 if (rap->rxa_m[j] != NULL) {
656 rap->rxa_m[j-i] = rap->rxa_m[j];
657 rap->rxa_m[j] = NULL;
658 if (--n == 0)
659 break;
660 }
661 }
662 KASSERT(n == 0, ("lost %d frames", n));
663 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
664 }
665 /*
666 * Adjust the start of the BA window to
667 * reflect the frames just dispatched.
668 */
669 rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
670 vap->iv_stats.is_ampdu_rx_oor += i;
671 }
672
673 #ifdef IEEE80211_AMPDU_AGE
674 /*
675 * Dispatch all frames in the A-MPDU re-order queue.
676 */
677 static void
ampdu_rx_flush(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap)678 ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
679 {
680 struct ieee80211vap *vap = ni->ni_vap;
681 struct mbuf *m;
682 int i;
683
684 for (i = 0; i < rap->rxa_wnd; i++) {
685 m = rap->rxa_m[i];
686 if (m == NULL)
687 continue;
688 rap->rxa_m[i] = NULL;
689 rap->rxa_qbytes -= m->m_pkthdr.len;
690 rap->rxa_qframes--;
691 vap->iv_stats.is_ampdu_rx_oor++;
692
693 ampdu_dispatch(ni, m);
694 if (rap->rxa_qframes == 0)
695 break;
696 }
697 }
698 #endif /* IEEE80211_AMPDU_AGE */
699
700 /*
701 * Dispatch all frames in the A-MPDU re-order queue
702 * preceding the specified sequence number. This logic
703 * handles window moves due to a received MSDU or BAR.
704 */
705 static void
ampdu_rx_flush_upto(struct ieee80211_node * ni,struct ieee80211_rx_ampdu * rap,ieee80211_seq winstart)706 ampdu_rx_flush_upto(struct ieee80211_node *ni,
707 struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
708 {
709 struct ieee80211vap *vap = ni->ni_vap;
710 struct mbuf *m;
711 ieee80211_seq seqno;
712 int i;
713
714 /*
715 * Flush any complete MSDU's with a sequence number lower
716 * than winstart. Gaps may exist. Note that we may actually
717 * dispatch frames past winstart if a run continues; this is
718 * an optimization that avoids having to do a separate pass
719 * to dispatch frames after moving the BA window start.
720 */
721 seqno = rap->rxa_start;
722 for (i = 0; i < rap->rxa_wnd; i++) {
723 m = rap->rxa_m[i];
724 if (m != NULL) {
725 rap->rxa_m[i] = NULL;
726 rap->rxa_qbytes -= m->m_pkthdr.len;
727 rap->rxa_qframes--;
728 vap->iv_stats.is_ampdu_rx_oor++;
729
730 ampdu_dispatch(ni, m);
731 } else {
732 if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
733 break;
734 }
735 seqno = IEEE80211_SEQ_INC(seqno);
736 }
737 /*
738 * If frames remain, copy the mbuf pointers down so
739 * they correspond to the offsets in the new window.
740 */
741 if (rap->rxa_qframes != 0) {
742 int n = rap->rxa_qframes, j;
743
744 /* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
745 KASSERT(rap->rxa_m[0] == NULL,
746 ("%s: BA window slot 0 occupied", __func__));
747 for (j = i+1; j < rap->rxa_wnd; j++) {
748 if (rap->rxa_m[j] != NULL) {
749 rap->rxa_m[j-i] = rap->rxa_m[j];
750 rap->rxa_m[j] = NULL;
751 if (--n == 0)
752 break;
753 }
754 }
755 KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
756 "BA win <%d:%d> winstart %d",
757 __func__, n, rap->rxa_qframes, i, rap->rxa_start,
758 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
759 winstart));
760 vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
761 }
762 /*
763 * Move the start of the BA window; we use the
764 * sequence number of the last MSDU that was
765 * passed up the stack+1 or winstart if stopped on
766 * a gap in the reorder buffer.
767 */
768 rap->rxa_start = seqno;
769 }
770
771 /*
772 * Process a received QoS data frame for an HT station. Handle
773 * A-MPDU reordering: if this frame is received out of order
774 * and falls within the BA window hold onto it. Otherwise if
775 * this frame completes a run, flush any pending frames. We
776 * return 1 if the frame is consumed. A 0 is returned if
777 * the frame should be processed normally by the caller.
778 */
779 int
ieee80211_ampdu_reorder(struct ieee80211_node * ni,struct mbuf * m)780 ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
781 {
782 #define IEEE80211_FC0_QOSDATA \
783 (IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
784 #define PROCESS 0 /* caller should process frame */
785 #define CONSUMED 1 /* frame consumed, caller does nothing */
786 struct ieee80211vap *vap = ni->ni_vap;
787 struct ieee80211_qosframe *wh;
788 struct ieee80211_rx_ampdu *rap;
789 ieee80211_seq rxseq;
790 uint8_t tid;
791 int off;
792
793 KASSERT((m->m_flags & (M_AMPDU | M_AMPDU_MPDU)) == M_AMPDU,
794 ("!a-mpdu or already re-ordered, flags 0x%x", m->m_flags));
795 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
796
797 /* NB: m_len known to be sufficient */
798 wh = mtod(m, struct ieee80211_qosframe *);
799 if (wh->i_fc[0] != IEEE80211_FC0_QOSDATA) {
800 /*
801 * Not QoS data, shouldn't get here but just
802 * return it to the caller for processing.
803 */
804 return PROCESS;
805 }
806 if (IEEE80211_IS_DSTODS(wh))
807 tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
808 else
809 tid = wh->i_qos[0];
810 tid &= IEEE80211_QOS_TID;
811 rap = &ni->ni_rx_ampdu[tid];
812 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
813 /*
814 * No ADDBA request yet, don't touch.
815 */
816 return PROCESS;
817 }
818 rxseq = le16toh(*(uint16_t *)wh->i_seq);
819 if ((rxseq & IEEE80211_SEQ_FRAG_MASK) != 0) {
820 /*
821 * Fragments are not allowed; toss.
822 */
823 IEEE80211_DISCARD_MAC(vap,
824 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
825 "A-MPDU", "fragment, rxseq 0x%x tid %u%s", rxseq, tid,
826 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
827 vap->iv_stats.is_ampdu_rx_drop++;
828 IEEE80211_NODE_STAT(ni, rx_drop);
829 m_freem(m);
830 return CONSUMED;
831 }
832 rxseq >>= IEEE80211_SEQ_SEQ_SHIFT;
833 rap->rxa_nframes++;
834 again:
835 if (rxseq == rap->rxa_start) {
836 /*
837 * First frame in window.
838 */
839 if (rap->rxa_qframes != 0) {
840 /*
841 * Dispatch as many packets as we can.
842 */
843 KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
844 ampdu_dispatch(ni, m);
845 ampdu_rx_dispatch(rap, ni);
846 return CONSUMED;
847 } else {
848 /*
849 * In order; advance window and notify
850 * caller to dispatch directly.
851 */
852 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
853 return PROCESS;
854 }
855 }
856 /*
857 * Frame is out of order; store if in the BA window.
858 */
859 /* calculate offset in BA window */
860 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
861 if (off < rap->rxa_wnd) {
862 /*
863 * Common case (hopefully): in the BA window.
864 * Sec 9.10.7.6.2 a) (p.137)
865 */
866 #ifdef IEEE80211_AMPDU_AGE
867 /*
868 * Check for frames sitting too long in the reorder queue.
869 * This should only ever happen if frames are not delivered
870 * without the sender otherwise notifying us (e.g. with a
871 * BAR to move the window). Typically this happens because
872 * of vendor bugs that cause the sequence number to jump.
873 * When this happens we get a gap in the reorder queue that
874 * leaves frame sitting on the queue until they get pushed
875 * out due to window moves. When the vendor does not send
876 * BAR this move only happens due to explicit packet sends
877 *
878 * NB: we only track the time of the oldest frame in the
879 * reorder q; this means that if we flush we might push
880 * frames that still "new"; if this happens then subsequent
881 * frames will result in BA window moves which cost something
882 * but is still better than a big throughput dip.
883 */
884 if (rap->rxa_qframes != 0) {
885 /* XXX honor batimeout? */
886 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
887 /*
888 * Too long since we received the first
889 * frame; flush the reorder buffer.
890 */
891 if (rap->rxa_qframes != 0) {
892 vap->iv_stats.is_ampdu_rx_age +=
893 rap->rxa_qframes;
894 ampdu_rx_flush(ni, rap);
895 }
896 rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
897 return PROCESS;
898 }
899 } else {
900 /*
901 * First frame, start aging timer.
902 */
903 rap->rxa_age = ticks;
904 }
905 #endif /* IEEE80211_AMPDU_AGE */
906 /* save packet */
907 if (rap->rxa_m[off] == NULL) {
908 rap->rxa_m[off] = m;
909 rap->rxa_qframes++;
910 rap->rxa_qbytes += m->m_pkthdr.len;
911 vap->iv_stats.is_ampdu_rx_reorder++;
912 } else {
913 IEEE80211_DISCARD_MAC(vap,
914 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
915 ni->ni_macaddr, "a-mpdu duplicate",
916 "seqno %u tid %u BA win <%u:%u>",
917 rxseq, tid, rap->rxa_start,
918 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
919 vap->iv_stats.is_rx_dup++;
920 IEEE80211_NODE_STAT(ni, rx_dup);
921 m_freem(m);
922 }
923 return CONSUMED;
924 }
925 if (off < IEEE80211_SEQ_BA_RANGE) {
926 /*
927 * Outside the BA window, but within range;
928 * flush the reorder q and move the window.
929 * Sec 9.10.7.6.2 b) (p.138)
930 */
931 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
932 "move BA win <%u:%u> (%u frames) rxseq %u tid %u",
933 rap->rxa_start,
934 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
935 rap->rxa_qframes, rxseq, tid);
936 vap->iv_stats.is_ampdu_rx_move++;
937
938 /*
939 * The spec says to flush frames up to but not including:
940 * WinStart_B = rxseq - rap->rxa_wnd + 1
941 * Then insert the frame or notify the caller to process
942 * it immediately. We can safely do this by just starting
943 * over again because we know the frame will now be within
944 * the BA window.
945 */
946 /* NB: rxa_wnd known to be >0 */
947 ampdu_rx_flush_upto(ni, rap,
948 IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
949 goto again;
950 } else {
951 /*
952 * Outside the BA window and out of range; toss.
953 * Sec 9.10.7.6.2 c) (p.138)
954 */
955 IEEE80211_DISCARD_MAC(vap,
956 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
957 "MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
958 rap->rxa_start,
959 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
960 rap->rxa_qframes, rxseq, tid,
961 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
962 vap->iv_stats.is_ampdu_rx_drop++;
963 IEEE80211_NODE_STAT(ni, rx_drop);
964 m_freem(m);
965 return CONSUMED;
966 }
967 #undef CONSUMED
968 #undef PROCESS
969 #undef IEEE80211_FC0_QOSDATA
970 }
971
972 /*
973 * Process a BAR ctl frame. Dispatch all frames up to
974 * the sequence number of the frame. If this frame is
975 * out of range it's discarded.
976 */
977 void
ieee80211_recv_bar(struct ieee80211_node * ni,struct mbuf * m0)978 ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
979 {
980 struct ieee80211vap *vap = ni->ni_vap;
981 struct ieee80211_frame_bar *wh;
982 struct ieee80211_rx_ampdu *rap;
983 ieee80211_seq rxseq;
984 int tid, off;
985
986 if (!ieee80211_recv_bar_ena) {
987 #if 0
988 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
989 ni->ni_macaddr, "BAR", "%s", "processing disabled");
990 #endif
991 vap->iv_stats.is_ampdu_bar_bad++;
992 return;
993 }
994 wh = mtod(m0, struct ieee80211_frame_bar *);
995 /* XXX check basic BAR */
996 tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
997 rap = &ni->ni_rx_ampdu[tid];
998 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
999 /*
1000 * No ADDBA request yet, don't touch.
1001 */
1002 IEEE80211_DISCARD_MAC(vap,
1003 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
1004 ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
1005 vap->iv_stats.is_ampdu_bar_bad++;
1006 return;
1007 }
1008 vap->iv_stats.is_ampdu_bar_rx++;
1009 rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
1010 if (rxseq == rap->rxa_start)
1011 return;
1012 /* calculate offset in BA window */
1013 off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
1014 if (off < IEEE80211_SEQ_BA_RANGE) {
1015 /*
1016 * Flush the reorder q up to rxseq and move the window.
1017 * Sec 9.10.7.6.3 a) (p.138)
1018 */
1019 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1020 "BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
1021 rap->rxa_start,
1022 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1023 rap->rxa_qframes, rxseq, tid);
1024 vap->iv_stats.is_ampdu_bar_move++;
1025
1026 ampdu_rx_flush_upto(ni, rap, rxseq);
1027 if (off >= rap->rxa_wnd) {
1028 /*
1029 * BAR specifies a window start to the right of BA
1030 * window; we must move it explicitly since
1031 * ampdu_rx_flush_upto will not.
1032 */
1033 rap->rxa_start = rxseq;
1034 }
1035 } else {
1036 /*
1037 * Out of range; toss.
1038 * Sec 9.10.7.6.3 b) (p.138)
1039 */
1040 IEEE80211_DISCARD_MAC(vap,
1041 IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
1042 "BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
1043 rap->rxa_start,
1044 IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
1045 rap->rxa_qframes, rxseq, tid,
1046 wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
1047 vap->iv_stats.is_ampdu_bar_oow++;
1048 IEEE80211_NODE_STAT(ni, rx_drop);
1049 }
1050 }
1051
1052 /*
1053 * Setup HT-specific state in a node. Called only
1054 * when HT use is negotiated so we don't do extra
1055 * work for temporary and/or legacy sta's.
1056 */
1057 void
ieee80211_ht_node_init(struct ieee80211_node * ni)1058 ieee80211_ht_node_init(struct ieee80211_node *ni)
1059 {
1060 struct ieee80211_tx_ampdu *tap;
1061 int tid;
1062
1063 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1064 ni,
1065 "%s: called",
1066 __func__);
1067
1068 if (ni->ni_flags & IEEE80211_NODE_HT) {
1069 /*
1070 * Clean AMPDU state on re-associate. This handles the case
1071 * where a station leaves w/o notifying us and then returns
1072 * before node is reaped for inactivity.
1073 */
1074 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1075 ni,
1076 "%s: calling cleanup",
1077 __func__);
1078 ieee80211_ht_node_cleanup(ni);
1079 }
1080 for (tid = 0; tid < WME_NUM_TID; tid++) {
1081 tap = &ni->ni_tx_ampdu[tid];
1082 tap->txa_tid = tid;
1083 tap->txa_ni = ni;
1084 ieee80211_txampdu_init_pps(tap);
1085 /* NB: further initialization deferred */
1086 }
1087 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1088 }
1089
1090 /*
1091 * Cleanup HT-specific state in a node. Called only
1092 * when HT use has been marked.
1093 */
1094 void
ieee80211_ht_node_cleanup(struct ieee80211_node * ni)1095 ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
1096 {
1097 struct ieee80211com *ic = ni->ni_ic;
1098 int i;
1099
1100 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
1101 ni,
1102 "%s: called",
1103 __func__);
1104
1105 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
1106
1107 /* XXX optimize this */
1108 for (i = 0; i < WME_NUM_TID; i++) {
1109 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
1110 if (tap->txa_flags & IEEE80211_AGGR_SETUP)
1111 ampdu_tx_stop(tap);
1112 }
1113 for (i = 0; i < WME_NUM_TID; i++)
1114 ic->ic_ampdu_rx_stop(ni, &ni->ni_rx_ampdu[i]);
1115
1116 ni->ni_htcap = 0;
1117 ni->ni_flags &= ~IEEE80211_NODE_HT_ALL;
1118 }
1119
1120 /*
1121 * Age out HT resources for a station.
1122 */
1123 void
ieee80211_ht_node_age(struct ieee80211_node * ni)1124 ieee80211_ht_node_age(struct ieee80211_node *ni)
1125 {
1126 #ifdef IEEE80211_AMPDU_AGE
1127 struct ieee80211vap *vap = ni->ni_vap;
1128 uint8_t tid;
1129 #endif
1130
1131 KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
1132
1133 #ifdef IEEE80211_AMPDU_AGE
1134 for (tid = 0; tid < WME_NUM_TID; tid++) {
1135 struct ieee80211_rx_ampdu *rap;
1136
1137 rap = &ni->ni_rx_ampdu[tid];
1138 if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
1139 continue;
1140 if (rap->rxa_qframes == 0)
1141 continue;
1142 /*
1143 * Check for frames sitting too long in the reorder queue.
1144 * See above for more details on what's happening here.
1145 */
1146 /* XXX honor batimeout? */
1147 if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
1148 /*
1149 * Too long since we received the first
1150 * frame; flush the reorder buffer.
1151 */
1152 vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
1153 ampdu_rx_flush(ni, rap);
1154 }
1155 }
1156 #endif /* IEEE80211_AMPDU_AGE */
1157 }
1158
1159 static struct ieee80211_channel *
findhtchan(struct ieee80211com * ic,struct ieee80211_channel * c,int htflags)1160 findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
1161 {
1162 return ieee80211_find_channel(ic, c->ic_freq,
1163 (c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
1164 }
1165
1166 /*
1167 * Adjust a channel to be HT/non-HT according to the vap's configuration.
1168 */
1169 struct ieee80211_channel *
ieee80211_ht_adjust_channel(struct ieee80211com * ic,struct ieee80211_channel * chan,int flags)1170 ieee80211_ht_adjust_channel(struct ieee80211com *ic,
1171 struct ieee80211_channel *chan, int flags)
1172 {
1173 struct ieee80211_channel *c;
1174
1175 if (flags & IEEE80211_FHT_HT) {
1176 /* promote to HT if possible */
1177 if (flags & IEEE80211_FHT_USEHT40) {
1178 if (!IEEE80211_IS_CHAN_HT40(chan)) {
1179 /* NB: arbitrarily pick ht40+ over ht40- */
1180 c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
1181 if (c == NULL)
1182 c = findhtchan(ic, chan,
1183 IEEE80211_CHAN_HT40D);
1184 if (c == NULL)
1185 c = findhtchan(ic, chan,
1186 IEEE80211_CHAN_HT20);
1187 if (c != NULL)
1188 chan = c;
1189 }
1190 } else if (!IEEE80211_IS_CHAN_HT20(chan)) {
1191 c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
1192 if (c != NULL)
1193 chan = c;
1194 }
1195 } else if (IEEE80211_IS_CHAN_HT(chan)) {
1196 /* demote to legacy, HT use is disabled */
1197 c = ieee80211_find_channel(ic, chan->ic_freq,
1198 chan->ic_flags &~ IEEE80211_CHAN_HT);
1199 if (c != NULL)
1200 chan = c;
1201 }
1202 return chan;
1203 }
1204
1205 /*
1206 * Setup HT-specific state for a legacy WDS peer.
1207 */
1208 void
ieee80211_ht_wds_init(struct ieee80211_node * ni)1209 ieee80211_ht_wds_init(struct ieee80211_node *ni)
1210 {
1211 struct ieee80211vap *vap = ni->ni_vap;
1212 struct ieee80211_tx_ampdu *tap;
1213 int tid;
1214
1215 KASSERT(vap->iv_flags_ht & IEEE80211_FHT_HT, ("no HT requested"));
1216
1217 /* XXX check scan cache in case peer has an ap and we have info */
1218 /*
1219 * If setup with a legacy channel; locate an HT channel.
1220 * Otherwise if the inherited channel (from a companion
1221 * AP) is suitable use it so we use the same location
1222 * for the extension channel).
1223 */
1224 ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
1225 ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
1226
1227 ni->ni_htcap = 0;
1228 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20)
1229 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
1230 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
1231 ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
1232 ni->ni_chw = 40;
1233 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
1234 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
1235 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
1236 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
1237 if (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40)
1238 ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
1239 } else {
1240 ni->ni_chw = 20;
1241 ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
1242 }
1243 ni->ni_htctlchan = ni->ni_chan->ic_ieee;
1244 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
1245 ni->ni_flags |= IEEE80211_NODE_RIFS;
1246 /* XXX does it make sense to enable SMPS? */
1247
1248 ni->ni_htopmode = 0; /* XXX need protection state */
1249 ni->ni_htstbc = 0; /* XXX need info */
1250
1251 for (tid = 0; tid < WME_NUM_TID; tid++) {
1252 tap = &ni->ni_tx_ampdu[tid];
1253 tap->txa_tid = tid;
1254 ieee80211_txampdu_init_pps(tap);
1255 }
1256 /* NB: AMPDU tx/rx governed by IEEE80211_FHT_AMPDU_{TX,RX} */
1257 ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
1258 }
1259
1260 /*
1261 * Notify hostap vaps of a change in the HTINFO ie.
1262 */
1263 static void
htinfo_notify(struct ieee80211com * ic)1264 htinfo_notify(struct ieee80211com *ic)
1265 {
1266 struct ieee80211vap *vap;
1267 int first = 1;
1268
1269 IEEE80211_LOCK_ASSERT(ic);
1270
1271 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1272 if (vap->iv_opmode != IEEE80211_M_HOSTAP)
1273 continue;
1274 if (vap->iv_state != IEEE80211_S_RUN ||
1275 !IEEE80211_IS_CHAN_HT(vap->iv_bss->ni_chan))
1276 continue;
1277 if (first) {
1278 IEEE80211_NOTE(vap,
1279 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
1280 vap->iv_bss,
1281 "HT bss occupancy change: %d sta, %d ht, "
1282 "%d ht40%s, HT protmode now 0x%x"
1283 , ic->ic_sta_assoc
1284 , ic->ic_ht_sta_assoc
1285 , ic->ic_ht40_sta_assoc
1286 , (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) ?
1287 ", non-HT sta present" : ""
1288 , ic->ic_curhtprotmode);
1289 first = 0;
1290 }
1291 ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
1292 }
1293 }
1294
1295 /*
1296 * Calculate HT protection mode from current
1297 * state and handle updates.
1298 */
1299 static void
htinfo_update(struct ieee80211com * ic)1300 htinfo_update(struct ieee80211com *ic)
1301 {
1302 uint8_t protmode;
1303
1304 if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
1305 protmode = IEEE80211_HTINFO_OPMODE_MIXED
1306 | IEEE80211_HTINFO_NONHT_PRESENT;
1307 } else if (ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) {
1308 protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
1309 | IEEE80211_HTINFO_NONHT_PRESENT;
1310 } else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
1311 IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
1312 ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
1313 protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
1314 } else {
1315 protmode = IEEE80211_HTINFO_OPMODE_PURE;
1316 }
1317 if (protmode != ic->ic_curhtprotmode) {
1318 ic->ic_curhtprotmode = protmode;
1319 htinfo_notify(ic);
1320 }
1321 }
1322
1323 /*
1324 * Handle an HT station joining a BSS.
1325 */
1326 void
ieee80211_ht_node_join(struct ieee80211_node * ni)1327 ieee80211_ht_node_join(struct ieee80211_node *ni)
1328 {
1329 struct ieee80211com *ic = ni->ni_ic;
1330
1331 IEEE80211_LOCK_ASSERT(ic);
1332
1333 if (ni->ni_flags & IEEE80211_NODE_HT) {
1334 ic->ic_ht_sta_assoc++;
1335 if (ni->ni_chw == 40)
1336 ic->ic_ht40_sta_assoc++;
1337 }
1338 htinfo_update(ic);
1339 }
1340
1341 /*
1342 * Handle an HT station leaving a BSS.
1343 */
1344 void
ieee80211_ht_node_leave(struct ieee80211_node * ni)1345 ieee80211_ht_node_leave(struct ieee80211_node *ni)
1346 {
1347 struct ieee80211com *ic = ni->ni_ic;
1348
1349 IEEE80211_LOCK_ASSERT(ic);
1350
1351 if (ni->ni_flags & IEEE80211_NODE_HT) {
1352 ic->ic_ht_sta_assoc--;
1353 if (ni->ni_chw == 40)
1354 ic->ic_ht40_sta_assoc--;
1355 }
1356 htinfo_update(ic);
1357 }
1358
1359 /*
1360 * Public version of htinfo_update; used for processing
1361 * beacon frames from overlapping bss.
1362 *
1363 * Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
1364 * (on receipt of a beacon that advertises MIXED) or
1365 * IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
1366 * from an overlapping legacy bss). We treat MIXED with
1367 * a higher precedence than PROTOPT (i.e. we will not change
1368 * change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
1369 * corresponds to how we handle things in htinfo_update.
1370 */
1371 void
ieee80211_htprot_update(struct ieee80211com * ic,int protmode)1372 ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
1373 {
1374 #define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
1375 IEEE80211_LOCK(ic);
1376
1377 /* track non-HT station presence */
1378 KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
1379 ("protmode 0x%x", protmode));
1380 ic->ic_flags_ht |= IEEE80211_FHT_NONHT_PR;
1381 ic->ic_lastnonht = ticks;
1382
1383 if (protmode != ic->ic_curhtprotmode &&
1384 (OPMODE(ic->ic_curhtprotmode) != IEEE80211_HTINFO_OPMODE_MIXED ||
1385 OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)) {
1386 /* push beacon update */
1387 ic->ic_curhtprotmode = protmode;
1388 htinfo_notify(ic);
1389 }
1390 IEEE80211_UNLOCK(ic);
1391 #undef OPMODE
1392 }
1393
1394 /*
1395 * Time out presence of an overlapping bss with non-HT
1396 * stations. When operating in hostap mode we listen for
1397 * beacons from other stations and if we identify a non-HT
1398 * station is present we update the opmode field of the
1399 * HTINFO ie. To identify when all non-HT stations are
1400 * gone we time out this condition.
1401 */
1402 void
ieee80211_ht_timeout(struct ieee80211com * ic)1403 ieee80211_ht_timeout(struct ieee80211com *ic)
1404 {
1405 IEEE80211_LOCK_ASSERT(ic);
1406
1407 if ((ic->ic_flags_ht & IEEE80211_FHT_NONHT_PR) &&
1408 time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
1409 #if 0
1410 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
1411 "%s", "time out non-HT STA present on channel");
1412 #endif
1413 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
1414 htinfo_update(ic);
1415 }
1416 }
1417
1418 /*
1419 * Process an 802.11n HT capabilities ie.
1420 */
1421 void
ieee80211_parse_htcap(struct ieee80211_node * ni,const uint8_t * ie)1422 ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
1423 {
1424 if (ie[0] == IEEE80211_ELEMID_VENDOR) {
1425 /*
1426 * Station used Vendor OUI ie to associate;
1427 * mark the node so when we respond we'll use
1428 * the Vendor OUI's and not the standard ie's.
1429 */
1430 ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
1431 ie += 4;
1432 } else
1433 ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
1434
1435 ni->ni_htcap = LE_READ_2(ie +
1436 __offsetof(struct ieee80211_ie_htcap, hc_cap));
1437 ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
1438 }
1439
1440 static void
htinfo_parse(struct ieee80211_node * ni,const struct ieee80211_ie_htinfo * htinfo)1441 htinfo_parse(struct ieee80211_node *ni,
1442 const struct ieee80211_ie_htinfo *htinfo)
1443 {
1444 uint16_t w;
1445
1446 ni->ni_htctlchan = htinfo->hi_ctrlchannel;
1447 ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
1448 w = LE_READ_2(&htinfo->hi_byte2);
1449 ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
1450 w = LE_READ_2(&htinfo->hi_byte45);
1451 ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
1452 }
1453
1454 /*
1455 * Parse an 802.11n HT info ie and save useful information
1456 * to the node state. Note this does not effect any state
1457 * changes such as for channel width change.
1458 */
1459 void
ieee80211_parse_htinfo(struct ieee80211_node * ni,const uint8_t * ie)1460 ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
1461 {
1462 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1463 ie += 4;
1464 htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
1465 }
1466
1467 /*
1468 * Handle 11n channel switch. Use the received HT ie's to
1469 * identify the right channel to use. If we cannot locate it
1470 * in the channel table then fallback to legacy operation.
1471 * Note that we use this information to identify the node's
1472 * channel only; the caller is responsible for insuring any
1473 * required channel change is done (e.g. in sta mode when
1474 * parsing the contents of a beacon frame).
1475 */
1476 static int
htinfo_update_chw(struct ieee80211_node * ni,int htflags)1477 htinfo_update_chw(struct ieee80211_node *ni, int htflags)
1478 {
1479 struct ieee80211com *ic = ni->ni_ic;
1480 struct ieee80211_channel *c;
1481 int chanflags;
1482 int ret = 0;
1483
1484 chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
1485 if (chanflags != ni->ni_chan->ic_flags) {
1486 /* XXX not right for ht40- */
1487 c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
1488 if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
1489 /*
1490 * No HT40 channel entry in our table; fall back
1491 * to HT20 operation. This should not happen.
1492 */
1493 c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
1494 #if 0
1495 IEEE80211_NOTE(ni->ni_vap,
1496 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1497 "no HT40 channel (freq %u), falling back to HT20",
1498 ni->ni_chan->ic_freq);
1499 #endif
1500 /* XXX stat */
1501 }
1502 if (c != NULL && c != ni->ni_chan) {
1503 IEEE80211_NOTE(ni->ni_vap,
1504 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
1505 "switch station to HT%d channel %u/0x%x",
1506 IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
1507 c->ic_freq, c->ic_flags);
1508 ni->ni_chan = c;
1509 ret = 1;
1510 }
1511 /* NB: caller responsible for forcing any channel change */
1512 }
1513 /* update node's tx channel width */
1514 ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
1515 return (ret);
1516 }
1517
1518 /*
1519 * Update 11n MIMO PS state according to received htcap.
1520 */
1521 static __inline int
htcap_update_mimo_ps(struct ieee80211_node * ni)1522 htcap_update_mimo_ps(struct ieee80211_node *ni)
1523 {
1524 uint16_t oflags = ni->ni_flags;
1525
1526 switch (ni->ni_htcap & IEEE80211_HTCAP_SMPS) {
1527 case IEEE80211_HTCAP_SMPS_DYNAMIC:
1528 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1529 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
1530 break;
1531 case IEEE80211_HTCAP_SMPS_ENA:
1532 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
1533 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1534 break;
1535 case IEEE80211_HTCAP_SMPS_OFF:
1536 default: /* disable on rx of reserved value */
1537 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
1538 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
1539 break;
1540 }
1541 return (oflags ^ ni->ni_flags);
1542 }
1543
1544 /*
1545 * Update short GI state according to received htcap
1546 * and local settings.
1547 */
1548 static __inline void
htcap_update_shortgi(struct ieee80211_node * ni)1549 htcap_update_shortgi(struct ieee80211_node *ni)
1550 {
1551 struct ieee80211vap *vap = ni->ni_vap;
1552
1553 ni->ni_flags &= ~(IEEE80211_NODE_SGI20|IEEE80211_NODE_SGI40);
1554 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) &&
1555 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20))
1556 ni->ni_flags |= IEEE80211_NODE_SGI20;
1557 if ((ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) &&
1558 (vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40))
1559 ni->ni_flags |= IEEE80211_NODE_SGI40;
1560 }
1561
1562 /*
1563 * Parse and update HT-related state extracted from
1564 * the HT cap and info ie's.
1565 */
1566 int
ieee80211_ht_updateparams(struct ieee80211_node * ni,const uint8_t * htcapie,const uint8_t * htinfoie)1567 ieee80211_ht_updateparams(struct ieee80211_node *ni,
1568 const uint8_t *htcapie, const uint8_t *htinfoie)
1569 {
1570 struct ieee80211vap *vap = ni->ni_vap;
1571 const struct ieee80211_ie_htinfo *htinfo;
1572 int htflags;
1573 int ret = 0;
1574
1575 ieee80211_parse_htcap(ni, htcapie);
1576 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1577 htcap_update_mimo_ps(ni);
1578 htcap_update_shortgi(ni);
1579
1580 if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
1581 htinfoie += 4;
1582 htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
1583 htinfo_parse(ni, htinfo);
1584
1585 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1586 IEEE80211_CHAN_HT20 : 0;
1587 /* NB: honor operating mode constraint */
1588 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
1589 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1590 if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
1591 htflags = IEEE80211_CHAN_HT40U;
1592 else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
1593 htflags = IEEE80211_CHAN_HT40D;
1594 }
1595 if (htinfo_update_chw(ni, htflags))
1596 ret = 1;
1597
1598 if ((htinfo->hi_byte1 & IEEE80211_HTINFO_RIFSMODE_PERM) &&
1599 (vap->iv_flags_ht & IEEE80211_FHT_RIFS))
1600 ni->ni_flags |= IEEE80211_NODE_RIFS;
1601 else
1602 ni->ni_flags &= ~IEEE80211_NODE_RIFS;
1603
1604 return (ret);
1605 }
1606
1607 /*
1608 * Parse and update HT-related state extracted from the HT cap ie
1609 * for a station joining an HT BSS.
1610 */
1611 void
ieee80211_ht_updatehtcap(struct ieee80211_node * ni,const uint8_t * htcapie)1612 ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
1613 {
1614 struct ieee80211vap *vap = ni->ni_vap;
1615 int htflags;
1616
1617 ieee80211_parse_htcap(ni, htcapie);
1618 if (vap->iv_htcaps & IEEE80211_HTCAP_SMPS)
1619 htcap_update_mimo_ps(ni);
1620 htcap_update_shortgi(ni);
1621
1622 /* NB: honor operating mode constraint */
1623 /* XXX 40 MHz intolerant */
1624 htflags = (vap->iv_flags_ht & IEEE80211_FHT_HT) ?
1625 IEEE80211_CHAN_HT20 : 0;
1626 if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
1627 (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)) {
1628 if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
1629 htflags = IEEE80211_CHAN_HT40U;
1630 else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
1631 htflags = IEEE80211_CHAN_HT40D;
1632 }
1633 (void) htinfo_update_chw(ni, htflags);
1634 }
1635
1636 /*
1637 * Install received HT rate set by parsing the HT cap ie.
1638 */
1639 int
ieee80211_setup_htrates(struct ieee80211_node * ni,const uint8_t * ie,int flags)1640 ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
1641 {
1642 struct ieee80211com *ic = ni->ni_ic;
1643 struct ieee80211vap *vap = ni->ni_vap;
1644 const struct ieee80211_ie_htcap *htcap;
1645 struct ieee80211_htrateset *rs;
1646 int i, maxequalmcs, maxunequalmcs;
1647
1648 maxequalmcs = ic->ic_txstream * 8 - 1;
1649 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL) {
1650 if (ic->ic_txstream >= 2)
1651 maxunequalmcs = 38;
1652 if (ic->ic_txstream >= 3)
1653 maxunequalmcs = 52;
1654 if (ic->ic_txstream >= 4)
1655 maxunequalmcs = 76;
1656 } else
1657 maxunequalmcs = 0;
1658
1659 rs = &ni->ni_htrates;
1660 memset(rs, 0, sizeof(*rs));
1661 if (ie != NULL) {
1662 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1663 ie += 4;
1664 htcap = (const struct ieee80211_ie_htcap *) ie;
1665 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1666 if (isclr(htcap->hc_mcsset, i))
1667 continue;
1668 if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
1669 IEEE80211_NOTE(vap,
1670 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1671 "WARNING, HT rate set too large; only "
1672 "using %u rates", IEEE80211_HTRATE_MAXSIZE);
1673 vap->iv_stats.is_rx_rstoobig++;
1674 break;
1675 }
1676 if (i <= 31 && i > maxequalmcs)
1677 continue;
1678 if (i == 32 &&
1679 (ic->ic_htcaps & IEEE80211_HTC_TXMCS32) == 0)
1680 continue;
1681 if (i > 32 && i > maxunequalmcs)
1682 continue;
1683 rs->rs_rates[rs->rs_nrates++] = i;
1684 }
1685 }
1686 return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
1687 }
1688
1689 /*
1690 * Mark rates in a node's HT rate set as basic according
1691 * to the information in the supplied HT info ie.
1692 */
1693 void
ieee80211_setup_basic_htrates(struct ieee80211_node * ni,const uint8_t * ie)1694 ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
1695 {
1696 const struct ieee80211_ie_htinfo *htinfo;
1697 struct ieee80211_htrateset *rs;
1698 int i, j;
1699
1700 if (ie[0] == IEEE80211_ELEMID_VENDOR)
1701 ie += 4;
1702 htinfo = (const struct ieee80211_ie_htinfo *) ie;
1703 rs = &ni->ni_htrates;
1704 if (rs->rs_nrates == 0) {
1705 IEEE80211_NOTE(ni->ni_vap,
1706 IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
1707 "%s", "WARNING, empty HT rate set");
1708 return;
1709 }
1710 for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
1711 if (isclr(htinfo->hi_basicmcsset, i))
1712 continue;
1713 for (j = 0; j < rs->rs_nrates; j++)
1714 if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
1715 rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
1716 }
1717 }
1718
1719 static void
ampdu_tx_setup(struct ieee80211_tx_ampdu * tap)1720 ampdu_tx_setup(struct ieee80211_tx_ampdu *tap)
1721 {
1722 callout_init(&tap->txa_timer, 1);
1723 tap->txa_flags |= IEEE80211_AGGR_SETUP;
1724 tap->txa_lastsample = ticks;
1725 }
1726
1727 static void
ampdu_tx_stop(struct ieee80211_tx_ampdu * tap)1728 ampdu_tx_stop(struct ieee80211_tx_ampdu *tap)
1729 {
1730 struct ieee80211_node *ni = tap->txa_ni;
1731 struct ieee80211com *ic = ni->ni_ic;
1732
1733 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
1734 tap->txa_ni,
1735 "%s: called",
1736 __func__);
1737
1738 KASSERT(tap->txa_flags & IEEE80211_AGGR_SETUP,
1739 ("txa_flags 0x%x tid %d ac %d", tap->txa_flags, tap->txa_tid,
1740 TID_TO_WME_AC(tap->txa_tid)));
1741
1742 /*
1743 * Stop BA stream if setup so driver has a chance
1744 * to reclaim any resources it might have allocated.
1745 */
1746 ic->ic_addba_stop(ni, tap);
1747 /*
1748 * Stop any pending BAR transmit.
1749 */
1750 bar_stop_timer(tap);
1751
1752 /*
1753 * Reset packet estimate.
1754 */
1755 ieee80211_txampdu_init_pps(tap);
1756
1757 /* NB: clearing NAK means we may re-send ADDBA */
1758 tap->txa_flags &= ~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
1759 }
1760
1761 /*
1762 * ADDBA response timeout.
1763 *
1764 * If software aggregation and per-TID queue management was done here,
1765 * that queue would be unpaused after the ADDBA timeout occurs.
1766 */
1767 static void
addba_timeout(void * arg)1768 addba_timeout(void *arg)
1769 {
1770 struct ieee80211_tx_ampdu *tap = arg;
1771 struct ieee80211_node *ni = tap->txa_ni;
1772 struct ieee80211com *ic = ni->ni_ic;
1773
1774 /* XXX ? */
1775 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1776 tap->txa_attempts++;
1777 ic->ic_addba_response_timeout(ni, tap);
1778 }
1779
1780 static void
addba_start_timeout(struct ieee80211_tx_ampdu * tap)1781 addba_start_timeout(struct ieee80211_tx_ampdu *tap)
1782 {
1783 /* XXX use CALLOUT_PENDING instead? */
1784 callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
1785 addba_timeout, tap);
1786 tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
1787 tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
1788 }
1789
1790 static void
addba_stop_timeout(struct ieee80211_tx_ampdu * tap)1791 addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
1792 {
1793 /* XXX use CALLOUT_PENDING instead? */
1794 if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
1795 callout_stop(&tap->txa_timer);
1796 tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
1797 }
1798 }
1799
1800 static void
null_addba_response_timeout(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)1801 null_addba_response_timeout(struct ieee80211_node *ni,
1802 struct ieee80211_tx_ampdu *tap)
1803 {
1804 }
1805
1806 /*
1807 * Default method for requesting A-MPDU tx aggregation.
1808 * We setup the specified state block and start a timer
1809 * to wait for an ADDBA response frame.
1810 */
1811 static int
ieee80211_addba_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int dialogtoken,int baparamset,int batimeout)1812 ieee80211_addba_request(struct ieee80211_node *ni,
1813 struct ieee80211_tx_ampdu *tap,
1814 int dialogtoken, int baparamset, int batimeout)
1815 {
1816 int bufsiz;
1817
1818 /* XXX locking */
1819 tap->txa_token = dialogtoken;
1820 tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
1821 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1822 tap->txa_wnd = (bufsiz == 0) ?
1823 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1824 addba_start_timeout(tap);
1825 return 1;
1826 }
1827
1828 /*
1829 * Called by drivers that wish to request an ADDBA session be
1830 * setup. This brings it up and starts the request timer.
1831 */
1832 int
ieee80211_ampdu_tx_request_ext(struct ieee80211_node * ni,int tid)1833 ieee80211_ampdu_tx_request_ext(struct ieee80211_node *ni, int tid)
1834 {
1835 struct ieee80211_tx_ampdu *tap;
1836
1837 if (tid < 0 || tid > 15)
1838 return (0);
1839 tap = &ni->ni_tx_ampdu[tid];
1840
1841 /* XXX locking */
1842 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
1843 /* do deferred setup of state */
1844 ampdu_tx_setup(tap);
1845 }
1846 /* XXX hack for not doing proper locking */
1847 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
1848 addba_start_timeout(tap);
1849 return (1);
1850 }
1851
1852 /*
1853 * Called by drivers that have marked a session as active.
1854 */
1855 int
ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node * ni,int tid,int status)1856 ieee80211_ampdu_tx_request_active_ext(struct ieee80211_node *ni, int tid,
1857 int status)
1858 {
1859 struct ieee80211_tx_ampdu *tap;
1860
1861 if (tid < 0 || tid > 15)
1862 return (0);
1863 tap = &ni->ni_tx_ampdu[tid];
1864
1865 /* XXX locking */
1866 addba_stop_timeout(tap);
1867 if (status == 1) {
1868 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1869 tap->txa_attempts = 0;
1870 } else {
1871 /* mark tid so we don't try again */
1872 tap->txa_flags |= IEEE80211_AGGR_NAK;
1873 }
1874 return (1);
1875 }
1876
1877 /*
1878 * Default method for processing an A-MPDU tx aggregation
1879 * response. We shutdown any pending timer and update the
1880 * state block according to the reply.
1881 */
1882 static int
ieee80211_addba_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status,int baparamset,int batimeout)1883 ieee80211_addba_response(struct ieee80211_node *ni,
1884 struct ieee80211_tx_ampdu *tap,
1885 int status, int baparamset, int batimeout)
1886 {
1887 int bufsiz, tid;
1888
1889 /* XXX locking */
1890 addba_stop_timeout(tap);
1891 if (status == IEEE80211_STATUS_SUCCESS) {
1892 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
1893 /* XXX override our request? */
1894 tap->txa_wnd = (bufsiz == 0) ?
1895 IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
1896 /* XXX AC/TID */
1897 tid = MS(baparamset, IEEE80211_BAPS_TID);
1898 tap->txa_flags |= IEEE80211_AGGR_RUNNING;
1899 tap->txa_attempts = 0;
1900 } else {
1901 /* mark tid so we don't try again */
1902 tap->txa_flags |= IEEE80211_AGGR_NAK;
1903 }
1904 return 1;
1905 }
1906
1907 /*
1908 * Default method for stopping A-MPDU tx aggregation.
1909 * Any timer is cleared and we drain any pending frames.
1910 */
1911 static void
ieee80211_addba_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)1912 ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
1913 {
1914 /* XXX locking */
1915 addba_stop_timeout(tap);
1916 if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
1917 /* XXX clear aggregation queue */
1918 tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
1919 }
1920 tap->txa_attempts = 0;
1921 }
1922
1923 /*
1924 * Process a received action frame using the default aggregation
1925 * policy. We intercept ADDBA-related frames and use them to
1926 * update our aggregation state. All other frames are passed up
1927 * for processing by ieee80211_recv_action.
1928 */
1929 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)1930 ht_recv_action_ba_addba_request(struct ieee80211_node *ni,
1931 const struct ieee80211_frame *wh,
1932 const uint8_t *frm, const uint8_t *efrm)
1933 {
1934 struct ieee80211com *ic = ni->ni_ic;
1935 struct ieee80211vap *vap = ni->ni_vap;
1936 struct ieee80211_rx_ampdu *rap;
1937 uint8_t dialogtoken;
1938 uint16_t baparamset, batimeout, baseqctl;
1939 uint16_t args[5];
1940 int tid;
1941
1942 dialogtoken = frm[2];
1943 baparamset = LE_READ_2(frm+3);
1944 batimeout = LE_READ_2(frm+5);
1945 baseqctl = LE_READ_2(frm+7);
1946
1947 tid = MS(baparamset, IEEE80211_BAPS_TID);
1948
1949 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
1950 "recv ADDBA request: dialogtoken %u baparamset 0x%x "
1951 "(tid %d bufsiz %d) batimeout %d baseqctl %d:%d",
1952 dialogtoken, baparamset,
1953 tid, MS(baparamset, IEEE80211_BAPS_BUFSIZ),
1954 batimeout,
1955 MS(baseqctl, IEEE80211_BASEQ_START),
1956 MS(baseqctl, IEEE80211_BASEQ_FRAG));
1957
1958 rap = &ni->ni_rx_ampdu[tid];
1959
1960 /* Send ADDBA response */
1961 args[0] = dialogtoken;
1962 /*
1963 * NB: We ack only if the sta associated with HT and
1964 * the ap is configured to do AMPDU rx (the latter
1965 * violates the 11n spec and is mostly for testing).
1966 */
1967 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
1968 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_RX)) {
1969 /* XXX handle ampdu_rx_start failure */
1970 ic->ic_ampdu_rx_start(ni, rap,
1971 baparamset, batimeout, baseqctl);
1972
1973 args[1] = IEEE80211_STATUS_SUCCESS;
1974 } else {
1975 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
1976 ni, "reject ADDBA request: %s",
1977 ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
1978 "administratively disabled" :
1979 "not negotiated for station");
1980 vap->iv_stats.is_addba_reject++;
1981 args[1] = IEEE80211_STATUS_UNSPECIFIED;
1982 }
1983 /* XXX honor rap flags? */
1984 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
1985 | SM(tid, IEEE80211_BAPS_TID)
1986 | SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
1987 ;
1988 args[3] = 0;
1989 args[4] = 0;
1990 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
1991 IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
1992 return 0;
1993 }
1994
1995 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)1996 ht_recv_action_ba_addba_response(struct ieee80211_node *ni,
1997 const struct ieee80211_frame *wh,
1998 const uint8_t *frm, const uint8_t *efrm)
1999 {
2000 struct ieee80211com *ic = ni->ni_ic;
2001 struct ieee80211vap *vap = ni->ni_vap;
2002 struct ieee80211_tx_ampdu *tap;
2003 uint8_t dialogtoken, policy;
2004 uint16_t baparamset, batimeout, code;
2005 int tid, bufsiz;
2006
2007 dialogtoken = frm[2];
2008 code = LE_READ_2(frm+3);
2009 baparamset = LE_READ_2(frm+5);
2010 tid = MS(baparamset, IEEE80211_BAPS_TID);
2011 bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
2012 policy = MS(baparamset, IEEE80211_BAPS_POLICY);
2013 batimeout = LE_READ_2(frm+7);
2014
2015 tap = &ni->ni_tx_ampdu[tid];
2016 if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
2017 IEEE80211_DISCARD_MAC(vap,
2018 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2019 ni->ni_macaddr, "ADDBA response",
2020 "no pending ADDBA, tid %d dialogtoken %u "
2021 "code %d", tid, dialogtoken, code);
2022 vap->iv_stats.is_addba_norequest++;
2023 return 0;
2024 }
2025 if (dialogtoken != tap->txa_token) {
2026 IEEE80211_DISCARD_MAC(vap,
2027 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2028 ni->ni_macaddr, "ADDBA response",
2029 "dialogtoken mismatch: waiting for %d, "
2030 "received %d, tid %d code %d",
2031 tap->txa_token, dialogtoken, tid, code);
2032 vap->iv_stats.is_addba_badtoken++;
2033 return 0;
2034 }
2035 /* NB: assumes IEEE80211_AGGR_IMMEDIATE is 1 */
2036 if (policy != (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE)) {
2037 IEEE80211_DISCARD_MAC(vap,
2038 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2039 ni->ni_macaddr, "ADDBA response",
2040 "policy mismatch: expecting %s, "
2041 "received %s, tid %d code %d",
2042 tap->txa_flags & IEEE80211_AGGR_IMMEDIATE,
2043 policy, tid, code);
2044 vap->iv_stats.is_addba_badpolicy++;
2045 return 0;
2046 }
2047 #if 0
2048 /* XXX we take MIN in ieee80211_addba_response */
2049 if (bufsiz > IEEE80211_AGGR_BAWMAX) {
2050 IEEE80211_DISCARD_MAC(vap,
2051 IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2052 ni->ni_macaddr, "ADDBA response",
2053 "BA window too large: max %d, "
2054 "received %d, tid %d code %d",
2055 bufsiz, IEEE80211_AGGR_BAWMAX, tid, code);
2056 vap->iv_stats.is_addba_badbawinsize++;
2057 return 0;
2058 }
2059 #endif
2060 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2061 "recv ADDBA response: dialogtoken %u code %d "
2062 "baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
2063 dialogtoken, code, baparamset, tid, bufsiz,
2064 batimeout);
2065 ic->ic_addba_response(ni, tap, code, baparamset, batimeout);
2066 return 0;
2067 }
2068
2069 static int
ht_recv_action_ba_delba(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2070 ht_recv_action_ba_delba(struct ieee80211_node *ni,
2071 const struct ieee80211_frame *wh,
2072 const uint8_t *frm, const uint8_t *efrm)
2073 {
2074 struct ieee80211com *ic = ni->ni_ic;
2075 struct ieee80211_rx_ampdu *rap;
2076 struct ieee80211_tx_ampdu *tap;
2077 uint16_t baparamset, code;
2078 int tid;
2079
2080 baparamset = LE_READ_2(frm+2);
2081 code = LE_READ_2(frm+4);
2082
2083 tid = MS(baparamset, IEEE80211_DELBAPS_TID);
2084
2085 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2086 "recv DELBA: baparamset 0x%x (tid %d initiator %d) "
2087 "code %d", baparamset, tid,
2088 MS(baparamset, IEEE80211_DELBAPS_INIT), code);
2089
2090 if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
2091 tap = &ni->ni_tx_ampdu[tid];
2092 ic->ic_addba_stop(ni, tap);
2093 } else {
2094 rap = &ni->ni_rx_ampdu[tid];
2095 ic->ic_ampdu_rx_stop(ni, rap);
2096 }
2097 return 0;
2098 }
2099
2100 static int
ht_recv_action_ht_txchwidth(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2101 ht_recv_action_ht_txchwidth(struct ieee80211_node *ni,
2102 const struct ieee80211_frame *wh,
2103 const uint8_t *frm, const uint8_t *efrm)
2104 {
2105 int chw;
2106
2107 chw = (frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040) ? 40 : 20;
2108
2109 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2110 "%s: HT txchwidth, width %d%s",
2111 __func__, chw, ni->ni_chw != chw ? "*" : "");
2112 if (chw != ni->ni_chw) {
2113 ni->ni_chw = chw;
2114 /* XXX notify on change */
2115 }
2116 return 0;
2117 }
2118
2119 static int
ht_recv_action_ht_mimopwrsave(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)2120 ht_recv_action_ht_mimopwrsave(struct ieee80211_node *ni,
2121 const struct ieee80211_frame *wh,
2122 const uint8_t *frm, const uint8_t *efrm)
2123 {
2124 const struct ieee80211_action_ht_mimopowersave *mps =
2125 (const struct ieee80211_action_ht_mimopowersave *) frm;
2126
2127 /* XXX check iv_htcaps */
2128 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_ENA)
2129 ni->ni_flags |= IEEE80211_NODE_MIMO_PS;
2130 else
2131 ni->ni_flags &= ~IEEE80211_NODE_MIMO_PS;
2132 if (mps->am_control & IEEE80211_A_HT_MIMOPWRSAVE_MODE)
2133 ni->ni_flags |= IEEE80211_NODE_MIMO_RTS;
2134 else
2135 ni->ni_flags &= ~IEEE80211_NODE_MIMO_RTS;
2136 /* XXX notify on change */
2137 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2138 "%s: HT MIMO PS (%s%s)", __func__,
2139 (ni->ni_flags & IEEE80211_NODE_MIMO_PS) ? "on" : "off",
2140 (ni->ni_flags & IEEE80211_NODE_MIMO_RTS) ? "+rts" : ""
2141 );
2142 return 0;
2143 }
2144
2145 /*
2146 * Transmit processing.
2147 */
2148
2149 /*
2150 * Check if A-MPDU should be requested/enabled for a stream.
2151 * We require a traffic rate above a per-AC threshold and we
2152 * also handle backoff from previous failed attempts.
2153 *
2154 * Drivers may override this method to bring in information
2155 * such as link state conditions in making the decision.
2156 */
2157 static int
ieee80211_ampdu_enable(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2158 ieee80211_ampdu_enable(struct ieee80211_node *ni,
2159 struct ieee80211_tx_ampdu *tap)
2160 {
2161 struct ieee80211vap *vap = ni->ni_vap;
2162
2163 if (tap->txa_avgpps <
2164 vap->iv_ampdu_mintraffic[TID_TO_WME_AC(tap->txa_tid)])
2165 return 0;
2166 /* XXX check rssi? */
2167 if (tap->txa_attempts >= ieee80211_addba_maxtries &&
2168 ticks < tap->txa_nextrequest) {
2169 /*
2170 * Don't retry too often; txa_nextrequest is set
2171 * to the minimum interval we'll retry after
2172 * ieee80211_addba_maxtries failed attempts are made.
2173 */
2174 return 0;
2175 }
2176 IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
2177 "enable AMPDU on tid %d (%s), avgpps %d pkts %d attempt %d",
2178 tap->txa_tid, ieee80211_wme_acnames[TID_TO_WME_AC(tap->txa_tid)],
2179 tap->txa_avgpps, tap->txa_pkts, tap->txa_attempts);
2180 return 1;
2181 }
2182
2183 /*
2184 * Request A-MPDU tx aggregation. Setup local state and
2185 * issue an ADDBA request. BA use will only happen after
2186 * the other end replies with ADDBA response.
2187 */
2188 int
ieee80211_ampdu_request(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap)2189 ieee80211_ampdu_request(struct ieee80211_node *ni,
2190 struct ieee80211_tx_ampdu *tap)
2191 {
2192 struct ieee80211com *ic = ni->ni_ic;
2193 uint16_t args[5];
2194 int tid, dialogtoken;
2195 static int tokens = 0; /* XXX */
2196
2197 /* XXX locking */
2198 if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
2199 /* do deferred setup of state */
2200 ampdu_tx_setup(tap);
2201 }
2202 /* XXX hack for not doing proper locking */
2203 tap->txa_flags &= ~IEEE80211_AGGR_NAK;
2204
2205 dialogtoken = (tokens+1) % 63; /* XXX */
2206 tid = tap->txa_tid;
2207 tap->txa_start = ni->ni_txseqs[tid];
2208
2209 args[0] = dialogtoken;
2210 args[1] = 0; /* NB: status code not used */
2211 args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
2212 | SM(tid, IEEE80211_BAPS_TID)
2213 | SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
2214 ;
2215 args[3] = 0; /* batimeout */
2216 /* NB: do first so there's no race against reply */
2217 if (!ic->ic_addba_request(ni, tap, dialogtoken, args[2], args[3])) {
2218 /* unable to setup state, don't make request */
2219 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2220 ni, "%s: could not setup BA stream for TID %d AC %d",
2221 __func__, tap->txa_tid, TID_TO_WME_AC(tap->txa_tid));
2222 /* defer next try so we don't slam the driver with requests */
2223 tap->txa_attempts = ieee80211_addba_maxtries;
2224 /* NB: check in case driver wants to override */
2225 if (tap->txa_nextrequest <= ticks)
2226 tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
2227 return 0;
2228 }
2229 tokens = dialogtoken; /* allocate token */
2230 /* NB: after calling ic_addba_request so driver can set txa_start */
2231 args[4] = SM(tap->txa_start, IEEE80211_BASEQ_START)
2232 | SM(0, IEEE80211_BASEQ_FRAG)
2233 ;
2234 return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2235 IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
2236 }
2237
2238 /*
2239 * Terminate an AMPDU tx stream. State is reclaimed
2240 * and the peer notified with a DelBA Action frame.
2241 */
2242 void
ieee80211_ampdu_stop(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int reason)2243 ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
2244 int reason)
2245 {
2246 struct ieee80211com *ic = ni->ni_ic;
2247 struct ieee80211vap *vap = ni->ni_vap;
2248 uint16_t args[4];
2249
2250 /* XXX locking */
2251 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2252 if (IEEE80211_AMPDU_RUNNING(tap)) {
2253 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2254 ni, "%s: stop BA stream for TID %d (reason %d)",
2255 __func__, tap->txa_tid, reason);
2256 vap->iv_stats.is_ampdu_stop++;
2257
2258 ic->ic_addba_stop(ni, tap);
2259 args[0] = tap->txa_tid;
2260 args[1] = IEEE80211_DELBAPS_INIT;
2261 args[2] = reason; /* XXX reason code */
2262 ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
2263 IEEE80211_ACTION_BA_DELBA, args);
2264 } else {
2265 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
2266 ni, "%s: BA stream for TID %d not running (reason %d)",
2267 __func__, tap->txa_tid, reason);
2268 vap->iv_stats.is_ampdu_stop_failed++;
2269 }
2270 }
2271
2272 /* XXX */
2273 static void bar_start_timer(struct ieee80211_tx_ampdu *tap);
2274
2275 static void
bar_timeout(void * arg)2276 bar_timeout(void *arg)
2277 {
2278 struct ieee80211_tx_ampdu *tap = arg;
2279 struct ieee80211_node *ni = tap->txa_ni;
2280
2281 KASSERT((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0,
2282 ("bar/addba collision, flags 0x%x", tap->txa_flags));
2283
2284 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2285 ni, "%s: tid %u flags 0x%x attempts %d", __func__,
2286 tap->txa_tid, tap->txa_flags, tap->txa_attempts);
2287
2288 /* guard against race with bar_tx_complete */
2289 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2290 return;
2291 /* XXX ? */
2292 if (tap->txa_attempts >= ieee80211_bar_maxtries) {
2293 struct ieee80211com *ic = ni->ni_ic;
2294
2295 ni->ni_vap->iv_stats.is_ampdu_bar_tx_fail++;
2296 /*
2297 * If (at least) the last BAR TX timeout was due to
2298 * an ieee80211_send_bar() failures, then we need
2299 * to make sure we notify the driver that a BAR
2300 * TX did occur and fail. This gives the driver
2301 * a chance to undo any queue pause that may
2302 * have occured.
2303 */
2304 ic->ic_bar_response(ni, tap, 1);
2305 ieee80211_ampdu_stop(ni, tap, IEEE80211_REASON_TIMEOUT);
2306 } else {
2307 ni->ni_vap->iv_stats.is_ampdu_bar_tx_retry++;
2308 if (ieee80211_send_bar(ni, tap, tap->txa_seqpending) != 0) {
2309 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2310 ni, "%s: failed to TX, starting timer\n",
2311 __func__);
2312 /*
2313 * If ieee80211_send_bar() fails here, the
2314 * timer may have stopped and/or the pending
2315 * flag may be clear. Because of this,
2316 * fake the BARPEND and reset the timer.
2317 * A retransmission attempt will then occur
2318 * during the next timeout.
2319 */
2320 /* XXX locking */
2321 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2322 bar_start_timer(tap);
2323 }
2324 }
2325 }
2326
2327 static void
bar_start_timer(struct ieee80211_tx_ampdu * tap)2328 bar_start_timer(struct ieee80211_tx_ampdu *tap)
2329 {
2330 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2331 tap->txa_ni,
2332 "%s: called",
2333 __func__);
2334 callout_reset(&tap->txa_timer, ieee80211_bar_timeout, bar_timeout, tap);
2335 }
2336
2337 static void
bar_stop_timer(struct ieee80211_tx_ampdu * tap)2338 bar_stop_timer(struct ieee80211_tx_ampdu *tap)
2339 {
2340 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2341 tap->txa_ni,
2342 "%s: called",
2343 __func__);
2344 callout_stop(&tap->txa_timer);
2345 }
2346
2347 static void
bar_tx_complete(struct ieee80211_node * ni,void * arg,int status)2348 bar_tx_complete(struct ieee80211_node *ni, void *arg, int status)
2349 {
2350 struct ieee80211_tx_ampdu *tap = arg;
2351
2352 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2353 ni, "%s: tid %u flags 0x%x pending %d status %d",
2354 __func__, tap->txa_tid, tap->txa_flags,
2355 callout_pending(&tap->txa_timer), status);
2356
2357 ni->ni_vap->iv_stats.is_ampdu_bar_tx++;
2358 /* XXX locking */
2359 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) &&
2360 callout_pending(&tap->txa_timer)) {
2361 struct ieee80211com *ic = ni->ni_ic;
2362
2363 if (status == 0) /* ACK'd */
2364 bar_stop_timer(tap);
2365 ic->ic_bar_response(ni, tap, status);
2366 /* NB: just let timer expire so we pace requests */
2367 }
2368 }
2369
2370 static void
ieee80211_bar_response(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,int status)2371 ieee80211_bar_response(struct ieee80211_node *ni,
2372 struct ieee80211_tx_ampdu *tap, int status)
2373 {
2374
2375 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2376 tap->txa_ni,
2377 "%s: called",
2378 __func__);
2379 if (status == 0) { /* got ACK */
2380 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
2381 ni, "BAR moves BA win <%u:%u> (%u frames) txseq %u tid %u",
2382 tap->txa_start,
2383 IEEE80211_SEQ_ADD(tap->txa_start, tap->txa_wnd-1),
2384 tap->txa_qframes, tap->txa_seqpending,
2385 tap->txa_tid);
2386
2387 /* NB: timer already stopped in bar_tx_complete */
2388 tap->txa_start = tap->txa_seqpending;
2389 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2390 }
2391 }
2392
2393 /*
2394 * Transmit a BAR frame to the specified node. The
2395 * BAR contents are drawn from the supplied aggregation
2396 * state associated with the node.
2397 *
2398 * NB: we only handle immediate ACK w/ compressed bitmap.
2399 */
2400 int
ieee80211_send_bar(struct ieee80211_node * ni,struct ieee80211_tx_ampdu * tap,ieee80211_seq seq)2401 ieee80211_send_bar(struct ieee80211_node *ni,
2402 struct ieee80211_tx_ampdu *tap, ieee80211_seq seq)
2403 {
2404 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2405 struct ieee80211vap *vap = ni->ni_vap;
2406 struct ieee80211com *ic = ni->ni_ic;
2407 struct ieee80211_frame_bar *bar;
2408 struct mbuf *m;
2409 uint16_t barctl, barseqctl;
2410 uint8_t *frm;
2411 int tid, ret;
2412
2413
2414 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2415 tap->txa_ni,
2416 "%s: called",
2417 __func__);
2418
2419 if ((tap->txa_flags & IEEE80211_AGGR_RUNNING) == 0) {
2420 /* no ADDBA response, should not happen */
2421 /* XXX stat+msg */
2422 return EINVAL;
2423 }
2424 /* XXX locking */
2425 bar_stop_timer(tap);
2426
2427 ieee80211_ref_node(ni);
2428
2429 m = ieee80211_getmgtframe(&frm, ic->ic_headroom, sizeof(*bar));
2430 if (m == NULL)
2431 senderr(ENOMEM, is_tx_nobuf);
2432
2433 if (!ieee80211_add_callback(m, bar_tx_complete, tap)) {
2434 m_freem(m);
2435 senderr(ENOMEM, is_tx_nobuf); /* XXX */
2436 /* NOTREACHED */
2437 }
2438
2439 bar = mtod(m, struct ieee80211_frame_bar *);
2440 bar->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2441 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
2442 bar->i_fc[1] = 0;
2443 IEEE80211_ADDR_COPY(bar->i_ra, ni->ni_macaddr);
2444 IEEE80211_ADDR_COPY(bar->i_ta, vap->iv_myaddr);
2445
2446 tid = tap->txa_tid;
2447 barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
2448 0 : IEEE80211_BAR_NOACK)
2449 | IEEE80211_BAR_COMP
2450 | SM(tid, IEEE80211_BAR_TID)
2451 ;
2452 barseqctl = SM(seq, IEEE80211_BAR_SEQ_START);
2453 /* NB: known to have proper alignment */
2454 bar->i_ctl = htole16(barctl);
2455 bar->i_seq = htole16(barseqctl);
2456 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_bar);
2457
2458 M_WME_SETAC(m, WME_AC_VO);
2459
2460 IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
2461
2462 /* XXX locking */
2463 /* init/bump attempts counter */
2464 if ((tap->txa_flags & IEEE80211_AGGR_BARPEND) == 0)
2465 tap->txa_attempts = 1;
2466 else
2467 tap->txa_attempts++;
2468 tap->txa_seqpending = seq;
2469 tap->txa_flags |= IEEE80211_AGGR_BARPEND;
2470
2471 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2472 ni, "send BAR: tid %u ctl 0x%x start %u (attempt %d)",
2473 tid, barctl, seq, tap->txa_attempts);
2474
2475 /*
2476 * ic_raw_xmit will free the node reference
2477 * regardless of queue/TX success or failure.
2478 */
2479 IEEE80211_TX_LOCK(ic);
2480 ret = ieee80211_raw_output(vap, ni, m, NULL);
2481 IEEE80211_TX_UNLOCK(ic);
2482 if (ret != 0) {
2483 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_11N,
2484 ni, "send BAR: failed: (ret = %d)\n",
2485 ret);
2486 /* xmit failed, clear state flag */
2487 tap->txa_flags &= ~IEEE80211_AGGR_BARPEND;
2488 vap->iv_stats.is_ampdu_bar_tx_fail++;
2489 return ret;
2490 }
2491 /* XXX hack against tx complete happening before timer is started */
2492 if (tap->txa_flags & IEEE80211_AGGR_BARPEND)
2493 bar_start_timer(tap);
2494 return 0;
2495 bad:
2496 IEEE80211_NOTE(tap->txa_ni->ni_vap, IEEE80211_MSG_11N,
2497 tap->txa_ni,
2498 "%s: bad! ret=%d",
2499 __func__, ret);
2500 vap->iv_stats.is_ampdu_bar_tx_fail++;
2501 ieee80211_free_node(ni);
2502 return ret;
2503 #undef senderr
2504 }
2505
2506 static int
ht_action_output(struct ieee80211_node * ni,struct mbuf * m)2507 ht_action_output(struct ieee80211_node *ni, struct mbuf *m)
2508 {
2509 struct ieee80211_bpf_params params;
2510
2511 memset(¶ms, 0, sizeof(params));
2512 params.ibp_pri = WME_AC_VO;
2513 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
2514 /* NB: we know all frames are unicast */
2515 params.ibp_try0 = ni->ni_txparms->maxretry;
2516 params.ibp_power = ni->ni_txpower;
2517 return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
2518 ¶ms);
2519 }
2520
2521 #define ADDSHORT(frm, v) do { \
2522 frm[0] = (v) & 0xff; \
2523 frm[1] = (v) >> 8; \
2524 frm += 2; \
2525 } while (0)
2526
2527 /*
2528 * Send an action management frame. The arguments are stuff
2529 * into a frame without inspection; the caller is assumed to
2530 * prepare them carefully (e.g. based on the aggregation state).
2531 */
2532 static int
ht_send_action_ba_addba(struct ieee80211_node * ni,int category,int action,void * arg0)2533 ht_send_action_ba_addba(struct ieee80211_node *ni,
2534 int category, int action, void *arg0)
2535 {
2536 struct ieee80211vap *vap = ni->ni_vap;
2537 struct ieee80211com *ic = ni->ni_ic;
2538 uint16_t *args = arg0;
2539 struct mbuf *m;
2540 uint8_t *frm;
2541
2542 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2543 "send ADDBA %s: dialogtoken %d status %d "
2544 "baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
2545 (action == IEEE80211_ACTION_BA_ADDBA_REQUEST) ?
2546 "request" : "response",
2547 args[0], args[1], args[2], MS(args[2], IEEE80211_BAPS_TID),
2548 args[3], args[4]);
2549
2550 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2551 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2552 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2553 ieee80211_ref_node(ni);
2554
2555 m = ieee80211_getmgtframe(&frm,
2556 ic->ic_headroom + sizeof(struct ieee80211_frame),
2557 sizeof(uint16_t) /* action+category */
2558 /* XXX may action payload */
2559 + sizeof(struct ieee80211_action_ba_addbaresponse)
2560 );
2561 if (m != NULL) {
2562 *frm++ = category;
2563 *frm++ = action;
2564 *frm++ = args[0]; /* dialog token */
2565 if (action == IEEE80211_ACTION_BA_ADDBA_RESPONSE)
2566 ADDSHORT(frm, args[1]); /* status code */
2567 ADDSHORT(frm, args[2]); /* baparamset */
2568 ADDSHORT(frm, args[3]); /* batimeout */
2569 if (action == IEEE80211_ACTION_BA_ADDBA_REQUEST)
2570 ADDSHORT(frm, args[4]); /* baseqctl */
2571 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2572 return ht_action_output(ni, m);
2573 } else {
2574 vap->iv_stats.is_tx_nobuf++;
2575 ieee80211_free_node(ni);
2576 return ENOMEM;
2577 }
2578 }
2579
2580 static int
ht_send_action_ba_delba(struct ieee80211_node * ni,int category,int action,void * arg0)2581 ht_send_action_ba_delba(struct ieee80211_node *ni,
2582 int category, int action, void *arg0)
2583 {
2584 struct ieee80211vap *vap = ni->ni_vap;
2585 struct ieee80211com *ic = ni->ni_ic;
2586 uint16_t *args = arg0;
2587 struct mbuf *m;
2588 uint16_t baparamset;
2589 uint8_t *frm;
2590
2591 baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
2592 | args[1]
2593 ;
2594 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2595 "send DELBA action: tid %d, initiator %d reason %d",
2596 args[0], args[1], args[2]);
2597
2598 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2599 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2600 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2601 ieee80211_ref_node(ni);
2602
2603 m = ieee80211_getmgtframe(&frm,
2604 ic->ic_headroom + sizeof(struct ieee80211_frame),
2605 sizeof(uint16_t) /* action+category */
2606 /* XXX may action payload */
2607 + sizeof(struct ieee80211_action_ba_addbaresponse)
2608 );
2609 if (m != NULL) {
2610 *frm++ = category;
2611 *frm++ = action;
2612 ADDSHORT(frm, baparamset);
2613 ADDSHORT(frm, args[2]); /* reason code */
2614 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2615 return ht_action_output(ni, m);
2616 } else {
2617 vap->iv_stats.is_tx_nobuf++;
2618 ieee80211_free_node(ni);
2619 return ENOMEM;
2620 }
2621 }
2622
2623 static int
ht_send_action_ht_txchwidth(struct ieee80211_node * ni,int category,int action,void * arg0)2624 ht_send_action_ht_txchwidth(struct ieee80211_node *ni,
2625 int category, int action, void *arg0)
2626 {
2627 struct ieee80211vap *vap = ni->ni_vap;
2628 struct ieee80211com *ic = ni->ni_ic;
2629 struct mbuf *m;
2630 uint8_t *frm;
2631
2632 IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
2633 "send HT txchwidth: width %d",
2634 IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20);
2635
2636 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2637 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
2638 ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
2639 ieee80211_ref_node(ni);
2640
2641 m = ieee80211_getmgtframe(&frm,
2642 ic->ic_headroom + sizeof(struct ieee80211_frame),
2643 sizeof(uint16_t) /* action+category */
2644 /* XXX may action payload */
2645 + sizeof(struct ieee80211_action_ba_addbaresponse)
2646 );
2647 if (m != NULL) {
2648 *frm++ = category;
2649 *frm++ = action;
2650 *frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
2651 IEEE80211_A_HT_TXCHWIDTH_2040 :
2652 IEEE80211_A_HT_TXCHWIDTH_20;
2653 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2654 return ht_action_output(ni, m);
2655 } else {
2656 vap->iv_stats.is_tx_nobuf++;
2657 ieee80211_free_node(ni);
2658 return ENOMEM;
2659 }
2660 }
2661 #undef ADDSHORT
2662
2663 /*
2664 * Construct the MCS bit mask for inclusion in an HT capabilities
2665 * information element.
2666 */
2667 static void
ieee80211_set_mcsset(struct ieee80211com * ic,uint8_t * frm)2668 ieee80211_set_mcsset(struct ieee80211com *ic, uint8_t *frm)
2669 {
2670 int i;
2671 uint8_t txparams;
2672
2673 KASSERT((ic->ic_rxstream > 0 && ic->ic_rxstream <= 4),
2674 ("ic_rxstream %d out of range", ic->ic_rxstream));
2675 KASSERT((ic->ic_txstream > 0 && ic->ic_txstream <= 4),
2676 ("ic_txstream %d out of range", ic->ic_txstream));
2677
2678 for (i = 0; i < ic->ic_rxstream * 8; i++)
2679 setbit(frm, i);
2680 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
2681 (ic->ic_htcaps & IEEE80211_HTC_RXMCS32))
2682 setbit(frm, 32);
2683 if (ic->ic_htcaps & IEEE80211_HTC_RXUNEQUAL) {
2684 if (ic->ic_rxstream >= 2) {
2685 for (i = 33; i <= 38; i++)
2686 setbit(frm, i);
2687 }
2688 if (ic->ic_rxstream >= 3) {
2689 for (i = 39; i <= 52; i++)
2690 setbit(frm, i);
2691 }
2692 if (ic->ic_txstream >= 4) {
2693 for (i = 53; i <= 76; i++)
2694 setbit(frm, i);
2695 }
2696 }
2697
2698 if (ic->ic_rxstream != ic->ic_txstream) {
2699 txparams = 0x1; /* TX MCS set defined */
2700 txparams |= 0x2; /* TX RX MCS not equal */
2701 txparams |= (ic->ic_txstream - 1) << 2; /* num TX streams */
2702 if (ic->ic_htcaps & IEEE80211_HTC_TXUNEQUAL)
2703 txparams |= 0x16; /* TX unequal modulation sup */
2704 } else
2705 txparams = 0;
2706 frm[12] = txparams;
2707 }
2708
2709 /*
2710 * Add body of an HTCAP information element.
2711 */
2712 static uint8_t *
ieee80211_add_htcap_body(uint8_t * frm,struct ieee80211_node * ni)2713 ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
2714 {
2715 #define ADDSHORT(frm, v) do { \
2716 frm[0] = (v) & 0xff; \
2717 frm[1] = (v) >> 8; \
2718 frm += 2; \
2719 } while (0)
2720 struct ieee80211com *ic = ni->ni_ic;
2721 struct ieee80211vap *vap = ni->ni_vap;
2722 uint16_t caps, extcaps;
2723 int rxmax, density;
2724
2725 /* HT capabilities */
2726 caps = vap->iv_htcaps & 0xffff;
2727 /*
2728 * Note channel width depends on whether we are operating as
2729 * a sta or not. When operating as a sta we are generating
2730 * a request based on our desired configuration. Otherwise
2731 * we are operational and the channel attributes identify
2732 * how we've been setup (which might be different if a fixed
2733 * channel is specified).
2734 */
2735 if (vap->iv_opmode == IEEE80211_M_STA) {
2736 /* override 20/40 use based on config */
2737 if (vap->iv_flags_ht & IEEE80211_FHT_USEHT40)
2738 caps |= IEEE80211_HTCAP_CHWIDTH40;
2739 else
2740 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2741
2742 /* Start by using the advertised settings */
2743 rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
2744 density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
2745
2746 /* Cap at VAP rxmax */
2747 if (rxmax > vap->iv_ampdu_rxmax)
2748 rxmax = vap->iv_ampdu_rxmax;
2749
2750 /*
2751 * If the VAP ampdu density value greater, use that.
2752 *
2753 * (Larger density value == larger minimum gap between A-MPDU
2754 * subframes.)
2755 */
2756 if (vap->iv_ampdu_density > density)
2757 density = vap->iv_ampdu_density;
2758
2759 /*
2760 * NB: Hardware might support HT40 on some but not all
2761 * channels. We can't determine this earlier because only
2762 * after association the channel is upgraded to HT based
2763 * on the negotiated capabilities.
2764 */
2765 if (ni->ni_chan != IEEE80211_CHAN_ANYC &&
2766 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40U) == NULL &&
2767 findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT40D) == NULL)
2768 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2769 } else {
2770 /* override 20/40 use based on current channel */
2771 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2772 caps |= IEEE80211_HTCAP_CHWIDTH40;
2773 else
2774 caps &= ~IEEE80211_HTCAP_CHWIDTH40;
2775
2776 /* XXX TODO should it start by using advertised settings? */
2777 rxmax = vap->iv_ampdu_rxmax;
2778 density = vap->iv_ampdu_density;
2779 }
2780
2781 /* adjust short GI based on channel and config */
2782 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) == 0)
2783 caps &= ~IEEE80211_HTCAP_SHORTGI20;
2784 if ((vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) == 0 ||
2785 (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
2786 caps &= ~IEEE80211_HTCAP_SHORTGI40;
2787 ADDSHORT(frm, caps);
2788
2789 /* HT parameters */
2790 *frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
2791 | SM(density, IEEE80211_HTCAP_MPDUDENSITY)
2792 ;
2793 frm++;
2794
2795 /* pre-zero remainder of ie */
2796 memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
2797 __offsetof(struct ieee80211_ie_htcap, hc_mcsset));
2798
2799 /* supported MCS set */
2800 /*
2801 * XXX: For sta mode the rate set should be restricted based
2802 * on the AP's capabilities, but ni_htrates isn't setup when
2803 * we're called to form an AssocReq frame so for now we're
2804 * restricted to the device capabilities.
2805 */
2806 ieee80211_set_mcsset(ni->ni_ic, frm);
2807
2808 frm += __offsetof(struct ieee80211_ie_htcap, hc_extcap) -
2809 __offsetof(struct ieee80211_ie_htcap, hc_mcsset);
2810
2811 /* HT extended capabilities */
2812 extcaps = vap->iv_htextcaps & 0xffff;
2813
2814 ADDSHORT(frm, extcaps);
2815
2816 frm += sizeof(struct ieee80211_ie_htcap) -
2817 __offsetof(struct ieee80211_ie_htcap, hc_txbf);
2818
2819 return frm;
2820 #undef ADDSHORT
2821 }
2822
2823 /*
2824 * Add 802.11n HT capabilities information element
2825 */
2826 uint8_t *
ieee80211_add_htcap(uint8_t * frm,struct ieee80211_node * ni)2827 ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
2828 {
2829 frm[0] = IEEE80211_ELEMID_HTCAP;
2830 frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
2831 return ieee80211_add_htcap_body(frm + 2, ni);
2832 }
2833
2834 /*
2835 * Add Broadcom OUI wrapped standard HTCAP ie; this is
2836 * used for compatibility w/ pre-draft implementations.
2837 */
2838 uint8_t *
ieee80211_add_htcap_vendor(uint8_t * frm,struct ieee80211_node * ni)2839 ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
2840 {
2841 frm[0] = IEEE80211_ELEMID_VENDOR;
2842 frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
2843 frm[2] = (BCM_OUI >> 0) & 0xff;
2844 frm[3] = (BCM_OUI >> 8) & 0xff;
2845 frm[4] = (BCM_OUI >> 16) & 0xff;
2846 frm[5] = BCM_OUI_HTCAP;
2847 return ieee80211_add_htcap_body(frm + 6, ni);
2848 }
2849
2850 /*
2851 * Construct the MCS bit mask of basic rates
2852 * for inclusion in an HT information element.
2853 */
2854 static void
ieee80211_set_basic_htrates(uint8_t * frm,const struct ieee80211_htrateset * rs)2855 ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
2856 {
2857 int i;
2858
2859 for (i = 0; i < rs->rs_nrates; i++) {
2860 int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
2861 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
2862 r < IEEE80211_HTRATE_MAXSIZE) {
2863 /* NB: this assumes a particular implementation */
2864 setbit(frm, r);
2865 }
2866 }
2867 }
2868
2869 /*
2870 * Update the HTINFO ie for a beacon frame.
2871 */
2872 void
ieee80211_ht_update_beacon(struct ieee80211vap * vap,struct ieee80211_beacon_offsets * bo)2873 ieee80211_ht_update_beacon(struct ieee80211vap *vap,
2874 struct ieee80211_beacon_offsets *bo)
2875 {
2876 #define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
2877 struct ieee80211_node *ni;
2878 const struct ieee80211_channel *bsschan;
2879 struct ieee80211com *ic = vap->iv_ic;
2880 struct ieee80211_ie_htinfo *ht =
2881 (struct ieee80211_ie_htinfo *) bo->bo_htinfo;
2882
2883 ni = ieee80211_ref_node(vap->iv_bss);
2884 bsschan = ni->ni_chan;
2885
2886 /* XXX only update on channel change */
2887 ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
2888 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2889 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PERM;
2890 else
2891 ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
2892 if (IEEE80211_IS_CHAN_HT40U(bsschan))
2893 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2894 else if (IEEE80211_IS_CHAN_HT40D(bsschan))
2895 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2896 else
2897 ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
2898 if (IEEE80211_IS_CHAN_HT40(bsschan))
2899 ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
2900
2901 /* protection mode */
2902 ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
2903
2904 ieee80211_free_node(ni);
2905
2906 /* XXX propagate to vendor ie's */
2907 #undef PROTMODE
2908 }
2909
2910 /*
2911 * Add body of an HTINFO information element.
2912 *
2913 * NB: We don't use struct ieee80211_ie_htinfo because we can
2914 * be called to fillin both a standard ie and a compat ie that
2915 * has a vendor OUI at the front.
2916 */
2917 static uint8_t *
ieee80211_add_htinfo_body(uint8_t * frm,struct ieee80211_node * ni)2918 ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
2919 {
2920 struct ieee80211vap *vap = ni->ni_vap;
2921 struct ieee80211com *ic = ni->ni_ic;
2922
2923 /* pre-zero remainder of ie */
2924 memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
2925
2926 /* primary/control channel center */
2927 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2928
2929 if (vap->iv_flags_ht & IEEE80211_FHT_RIFS)
2930 frm[0] = IEEE80211_HTINFO_RIFSMODE_PERM;
2931 else
2932 frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
2933 if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
2934 frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
2935 else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
2936 frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
2937 else
2938 frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
2939 if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
2940 frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
2941
2942 frm[1] = ic->ic_curhtprotmode;
2943
2944 frm += 5;
2945
2946 /* basic MCS set */
2947 ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
2948 frm += sizeof(struct ieee80211_ie_htinfo) -
2949 __offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
2950 return frm;
2951 }
2952
2953 /*
2954 * Add 802.11n HT information information element.
2955 */
2956 uint8_t *
ieee80211_add_htinfo(uint8_t * frm,struct ieee80211_node * ni)2957 ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
2958 {
2959 frm[0] = IEEE80211_ELEMID_HTINFO;
2960 frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
2961 return ieee80211_add_htinfo_body(frm + 2, ni);
2962 }
2963
2964 /*
2965 * Add Broadcom OUI wrapped standard HTINFO ie; this is
2966 * used for compatibility w/ pre-draft implementations.
2967 */
2968 uint8_t *
ieee80211_add_htinfo_vendor(uint8_t * frm,struct ieee80211_node * ni)2969 ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
2970 {
2971 frm[0] = IEEE80211_ELEMID_VENDOR;
2972 frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
2973 frm[2] = (BCM_OUI >> 0) & 0xff;
2974 frm[3] = (BCM_OUI >> 8) & 0xff;
2975 frm[4] = (BCM_OUI >> 16) & 0xff;
2976 frm[5] = BCM_OUI_HTINFO;
2977 return ieee80211_add_htinfo_body(frm + 6, ni);
2978 }
2979