1 /*-
2 * Copyright (c) 2017 Adrian Chadd <adrian@FreeBSD.org>
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 #endif
29
30 /*
31 * IEEE 802.11ac-2013 protocol support.
32 */
33
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.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 #include <net80211/ieee80211_vht.h>
54
55 #define ADDSHORT(frm, v) do { \
56 frm[0] = (v) & 0xff; \
57 frm[1] = (v) >> 8; \
58 frm += 2; \
59 } while (0)
60 #define ADDWORD(frm, v) do { \
61 frm[0] = (v) & 0xff; \
62 frm[1] = ((v) >> 8) & 0xff; \
63 frm[2] = ((v) >> 16) & 0xff; \
64 frm[3] = ((v) >> 24) & 0xff; \
65 frm += 4; \
66 } while (0)
67
68 /*
69 * Immediate TODO:
70 *
71 * + handle WLAN_ACTION_VHT_OPMODE_NOTIF and other VHT action frames
72 * + ensure vhtinfo/vhtcap parameters correctly use the negotiated
73 * capabilities and ratesets
74 * + group ID management operation
75 */
76
77 /*
78 * XXX TODO: handle WLAN_ACTION_VHT_OPMODE_NOTIF
79 *
80 * Look at mac80211/vht.c:ieee80211_vht_handle_opmode() for further details.
81 */
82
83 static int
vht_recv_action_placeholder(struct ieee80211_node * ni,const struct ieee80211_frame * wh,const uint8_t * frm,const uint8_t * efrm)84 vht_recv_action_placeholder(struct ieee80211_node *ni,
85 const struct ieee80211_frame *wh,
86 const uint8_t *frm, const uint8_t *efrm)
87 {
88
89 #ifdef IEEE80211_DEBUG
90 ieee80211_note(ni->ni_vap, "%s: called; fc=0x%.2x/0x%.2x",
91 __func__, wh->i_fc[0], wh->i_fc[1]);
92 #endif
93 return (0);
94 }
95
96 static int
vht_send_action_placeholder(struct ieee80211_node * ni,int category,int action,void * arg0)97 vht_send_action_placeholder(struct ieee80211_node *ni,
98 int category, int action, void *arg0)
99 {
100
101 #ifdef IEEE80211_DEBUG
102 ieee80211_note(ni->ni_vap, "%s: called; category=%d, action=%d",
103 __func__, category, action);
104 #endif
105 return (EINVAL);
106 }
107
108 static void
ieee80211_vht_init(void)109 ieee80211_vht_init(void)
110 {
111
112 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_VHT,
113 WLAN_ACTION_VHT_COMPRESSED_BF, vht_recv_action_placeholder);
114 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_VHT,
115 WLAN_ACTION_VHT_GROUPID_MGMT, vht_recv_action_placeholder);
116 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_VHT,
117 WLAN_ACTION_VHT_OPMODE_NOTIF, vht_recv_action_placeholder);
118
119 ieee80211_send_action_register(IEEE80211_ACTION_CAT_VHT,
120 WLAN_ACTION_VHT_COMPRESSED_BF, vht_send_action_placeholder);
121 ieee80211_send_action_register(IEEE80211_ACTION_CAT_VHT,
122 WLAN_ACTION_VHT_GROUPID_MGMT, vht_send_action_placeholder);
123 ieee80211_send_action_register(IEEE80211_ACTION_CAT_VHT,
124 WLAN_ACTION_VHT_OPMODE_NOTIF, vht_send_action_placeholder);
125 }
126
127 SYSINIT(wlan_vht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_vht_init, NULL);
128
129 void
ieee80211_vht_attach(struct ieee80211com * ic)130 ieee80211_vht_attach(struct ieee80211com *ic)
131 {
132 }
133
134 void
ieee80211_vht_detach(struct ieee80211com * ic)135 ieee80211_vht_detach(struct ieee80211com *ic)
136 {
137 }
138
139 void
ieee80211_vht_vattach(struct ieee80211vap * vap)140 ieee80211_vht_vattach(struct ieee80211vap *vap)
141 {
142 struct ieee80211com *ic = vap->iv_ic;
143
144 if (! IEEE80211_CONF_VHT(ic))
145 return;
146
147 vap->iv_vht_cap.vht_cap_info = ic->ic_vht_cap.vht_cap_info;
148 vap->iv_vhtextcaps = ic->ic_vhtextcaps;
149
150 /* XXX assume VHT80 support; should really check vhtcaps */
151 vap->iv_vht_flags =
152 IEEE80211_FVHT_VHT
153 | IEEE80211_FVHT_USEVHT40
154 | IEEE80211_FVHT_USEVHT80;
155 if (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(vap->iv_vht_cap.vht_cap_info))
156 vap->iv_vht_flags |= IEEE80211_FVHT_USEVHT160;
157 if (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(vap->iv_vht_cap.vht_cap_info))
158 vap->iv_vht_flags |= IEEE80211_FVHT_USEVHT80P80;
159
160 memcpy(&vap->iv_vht_cap.supp_mcs, &ic->ic_vht_cap.supp_mcs,
161 sizeof(struct ieee80211_vht_mcs_info));
162 }
163
164 void
ieee80211_vht_vdetach(struct ieee80211vap * vap)165 ieee80211_vht_vdetach(struct ieee80211vap *vap)
166 {
167 }
168
169 #if 0
170 static void
171 vht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
172 {
173 }
174 #endif
175
176 static int
vht_mcs_to_num(int m)177 vht_mcs_to_num(int m)
178 {
179
180 switch (m) {
181 case IEEE80211_VHT_MCS_SUPPORT_0_7:
182 return (7);
183 case IEEE80211_VHT_MCS_SUPPORT_0_8:
184 return (8);
185 case IEEE80211_VHT_MCS_SUPPORT_0_9:
186 return (9);
187 default:
188 return (0);
189 }
190 }
191
192 void
ieee80211_vht_announce(struct ieee80211com * ic)193 ieee80211_vht_announce(struct ieee80211com *ic)
194 {
195 int i, tx, rx;
196
197 if (! IEEE80211_CONF_VHT(ic))
198 return;
199
200 /* Channel width */
201 ic_printf(ic, "[VHT] Channel Widths: 20MHz, 40MHz, 80MHz%s%s\n",
202 (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(ic->ic_vht_cap.vht_cap_info)) ?
203 ", 160MHz" : "",
204 (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(ic->ic_vht_cap.vht_cap_info)) ?
205 ", 80+80MHz" : "");
206 /* Features */
207 ic_printf(ic, "[VHT] Features: %b\n", ic->ic_vht_cap.vht_cap_info,
208 IEEE80211_VHTCAP_BITS);
209
210 /* For now, just 5GHz VHT. Worry about 2GHz VHT later */
211 for (i = 0; i < 8; i++) {
212 /* Each stream is 2 bits */
213 tx = (ic->ic_vht_cap.supp_mcs.tx_mcs_map >> (2*i)) & 0x3;
214 rx = (ic->ic_vht_cap.supp_mcs.rx_mcs_map >> (2*i)) & 0x3;
215 if (tx == 3 && rx == 3)
216 continue;
217 ic_printf(ic, "[VHT] NSS %d: TX MCS 0..%d, RX MCS 0..%d\n",
218 i + 1, vht_mcs_to_num(tx), vht_mcs_to_num(rx));
219 }
220 }
221
222 void
ieee80211_vht_node_init(struct ieee80211_node * ni)223 ieee80211_vht_node_init(struct ieee80211_node *ni)
224 {
225
226 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
227 "%s: called", __func__);
228 ni->ni_flags |= IEEE80211_NODE_VHT;
229 }
230
231 void
ieee80211_vht_node_cleanup(struct ieee80211_node * ni)232 ieee80211_vht_node_cleanup(struct ieee80211_node *ni)
233 {
234
235 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
236 "%s: called", __func__);
237 ni->ni_flags &= ~IEEE80211_NODE_VHT;
238 ni->ni_vhtcap = 0;
239 bzero(&ni->ni_vht_mcsinfo, sizeof(struct ieee80211_vht_mcs_info));
240 }
241
242 /*
243 * Parse an 802.11ac VHT operation IE.
244 */
245 void
ieee80211_parse_vhtopmode(struct ieee80211_node * ni,const uint8_t * ie)246 ieee80211_parse_vhtopmode(struct ieee80211_node *ni, const uint8_t *ie)
247 {
248 /* vht operation */
249 ni->ni_vht_chanwidth = ie[2];
250 ni->ni_vht_chan1 = ie[3];
251 ni->ni_vht_chan2 = ie[4];
252 ni->ni_vht_basicmcs = le16dec(ie + 5);
253
254 #if 0
255 printf("%s: chan1=%d, chan2=%d, chanwidth=%d, basicmcs=0x%04x\n",
256 __func__, ni->ni_vht_chan1, ni->ni_vht_chan2, ni->ni_vht_chanwidth,
257 ni->ni_vht_basicmcs);
258 #endif
259 }
260
261 /*
262 * Parse an 802.11ac VHT capability IE.
263 */
264 void
ieee80211_parse_vhtcap(struct ieee80211_node * ni,const uint8_t * ie)265 ieee80211_parse_vhtcap(struct ieee80211_node *ni, const uint8_t *ie)
266 {
267
268 /* vht capability */
269 ni->ni_vhtcap = le32dec(ie + 2);
270
271 /* suppmcs */
272 ni->ni_vht_mcsinfo.rx_mcs_map = le16dec(ie + 6);
273 ni->ni_vht_mcsinfo.rx_highest = le16dec(ie + 8);
274 ni->ni_vht_mcsinfo.tx_mcs_map = le16dec(ie + 10);
275 ni->ni_vht_mcsinfo.tx_highest = le16dec(ie + 12);
276 }
277
278 int
ieee80211_vht_updateparams(struct ieee80211_node * ni,const uint8_t * vhtcap_ie,const uint8_t * vhtop_ie)279 ieee80211_vht_updateparams(struct ieee80211_node *ni,
280 const uint8_t *vhtcap_ie,
281 const uint8_t *vhtop_ie)
282 {
283
284 //printf("%s: called\n", __func__);
285
286 ieee80211_parse_vhtcap(ni, vhtcap_ie);
287 ieee80211_parse_vhtopmode(ni, vhtop_ie);
288 return (0);
289 }
290
291 void
ieee80211_setup_vht_rates(struct ieee80211_node * ni,const uint8_t * vhtcap_ie,const uint8_t * vhtop_ie)292 ieee80211_setup_vht_rates(struct ieee80211_node *ni,
293 const uint8_t *vhtcap_ie,
294 const uint8_t *vhtop_ie)
295 {
296
297 //printf("%s: called\n", __func__);
298 /* XXX TODO */
299 }
300
301 void
ieee80211_vht_timeout(struct ieee80211vap * vap)302 ieee80211_vht_timeout(struct ieee80211vap *vap)
303 {
304 }
305
306 void
ieee80211_vht_node_join(struct ieee80211_node * ni)307 ieee80211_vht_node_join(struct ieee80211_node *ni)
308 {
309
310 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
311 "%s: called", __func__);
312 }
313
314 void
ieee80211_vht_node_leave(struct ieee80211_node * ni)315 ieee80211_vht_node_leave(struct ieee80211_node *ni)
316 {
317
318 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
319 "%s: called", __func__);
320 }
321
322 /*
323 * Calculate the VHTCAP IE for a given node.
324 *
325 * This includes calculating the capability intersection based on the
326 * current operating mode and intersection of the TX/RX MCS maps.
327 *
328 * The standard only makes it clear about MCS rate negotiation
329 * and MCS basic rates (which must be a subset of the general
330 * negotiated rates). It doesn't make it clear that the AP should
331 * figure out the minimum functional overlap with the STA and
332 * support that.
333 *
334 * Note: this is in host order, not in 802.11 endian order.
335 *
336 * TODO: ensure I re-read 9.7.11 Rate Selection for VHT STAs.
337 *
338 * TODO: investigate what we should negotiate for MU-MIMO beamforming
339 * options.
340 *
341 * opmode is '1' for "vhtcap as if I'm a STA", 0 otherwise.
342 */
343 void
ieee80211_vht_get_vhtcap_ie(struct ieee80211_node * ni,struct ieee80211_vht_cap * vhtcap,int opmode)344 ieee80211_vht_get_vhtcap_ie(struct ieee80211_node *ni,
345 struct ieee80211_vht_cap *vhtcap, int opmode)
346 {
347 struct ieee80211vap *vap = ni->ni_vap;
348 // struct ieee80211com *ic = vap->iv_ic;
349 uint32_t val, val1, val2;
350 uint32_t new_vhtcap;
351 int i;
352
353 /*
354 * Capabilities - it depends on whether we are a station
355 * or not.
356 */
357 new_vhtcap = 0;
358
359 /*
360 * Station - use our desired configuration based on
361 * local config, local device bits and the already-learnt
362 * vhtcap/vhtinfo IE in the node.
363 */
364
365 /* Limit MPDU size to the smaller of the two */
366 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
367 IEEE80211_VHTCAP_MAX_MPDU_MASK);
368 if (opmode == 1) {
369 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
370 IEEE80211_VHTCAP_MAX_MPDU_MASK);
371 }
372 val = MIN(val1, val2);
373 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_MAX_MPDU_MASK);
374
375 /* Limit supp channel config */
376 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
377 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
378 if (opmode == 1) {
379 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
380 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
381 }
382 if ((val2 == 2) &&
383 ((vap->iv_vht_flags & IEEE80211_FVHT_USEVHT80P80) == 0))
384 val2 = 1;
385 if ((val2 == 1) &&
386 ((vap->iv_vht_flags & IEEE80211_FVHT_USEVHT160) == 0))
387 val2 = 0;
388 val = MIN(val1, val2);
389 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
390 IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
391
392 /* RX LDPC */
393 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
394 IEEE80211_VHTCAP_RXLDPC);
395 if (opmode == 1) {
396 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
397 IEEE80211_VHTCAP_RXLDPC);
398 }
399 val = MIN(val1, val2);
400 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_RXLDPC);
401
402 /* Short-GI 80 */
403 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
404 IEEE80211_VHTCAP_SHORT_GI_80);
405 if (opmode == 1) {
406 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
407 IEEE80211_VHTCAP_SHORT_GI_80);
408 }
409 val = MIN(val1, val2);
410 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_SHORT_GI_80);
411
412 /* Short-GI 160 */
413 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
414 IEEE80211_VHTCAP_SHORT_GI_160);
415 if (opmode == 1) {
416 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
417 IEEE80211_VHTCAP_SHORT_GI_160);
418 }
419 val = MIN(val1, val2);
420 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_SHORT_GI_160);
421
422 /*
423 * STBC is slightly more complicated.
424 *
425 * In non-STA mode, we just announce our capabilities and that
426 * is that.
427 *
428 * In STA mode, we should calculate our capabilities based on
429 * local capabilities /and/ what the remote says. So:
430 *
431 * + Only TX STBC if we support it and the remote supports RX STBC;
432 * + Only announce RX STBC if we support it and the remote supports
433 * TX STBC;
434 * + RX STBC should be the minimum of local and remote RX STBC;
435 */
436
437 /* TX STBC */
438 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
439 IEEE80211_VHTCAP_TXSTBC);
440 if (opmode == 1) {
441 /* STA mode - enable it only if node RXSTBC is non-zero */
442 val2 = !! _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
443 IEEE80211_VHTCAP_RXSTBC_MASK);
444 }
445 val = MIN(val1, val2);
446 if ((vap->iv_vht_flags & IEEE80211_FVHT_STBC_TX) == 0)
447 val = 0;
448 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_TXSTBC);
449
450 /* RX STBC1..4 */
451 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
452 IEEE80211_VHTCAP_RXSTBC_MASK);
453 if (opmode == 1) {
454 /* STA mode - enable it only if node TXSTBC is non-zero */
455 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
456 IEEE80211_VHTCAP_TXSTBC);
457 }
458 val = MIN(val1, val2);
459 if ((vap->iv_vht_flags & IEEE80211_FVHT_STBC_RX) == 0)
460 val = 0;
461 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_RXSTBC_MASK);
462
463 /*
464 * Finally - if RXSTBC is 0, then don't enable TXSTBC.
465 * Strictly speaking a device can TXSTBC and not RXSTBC, but
466 * it would be silly.
467 */
468 if (val == 0)
469 new_vhtcap &= ~IEEE80211_VHTCAP_TXSTBC;
470
471 /*
472 * Some of these fields require other fields to exist.
473 * So before using it, the parent field needs to be checked
474 * otherwise the overridden value may be wrong.
475 *
476 * For example, if SU beamformee is set to 0, then BF STS
477 * needs to be 0.
478 */
479
480 /* SU Beamformer capable */
481 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
482 IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
483 if (opmode == 1) {
484 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
485 IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
486 }
487 val = MIN(val1, val2);
488 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
489 IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
490
491 /* SU Beamformee capable */
492 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
493 IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
494 if (opmode == 1) {
495 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
496 IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
497 }
498 val = MIN(val1, val2);
499 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
500 IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
501
502 /* Beamformee STS capability - only if SU beamformee capable */
503 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
504 IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
505 if (opmode == 1) {
506 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
507 IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
508 }
509 val = MIN(val1, val2);
510 if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE) == 0)
511 val = 0;
512 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
513 IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
514
515 /* Sounding dimensions - only if SU beamformer capable */
516 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
517 IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
518 if (opmode == 1)
519 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
520 IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
521 val = MIN(val1, val2);
522 if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE) == 0)
523 val = 0;
524 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
525 IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
526
527 /*
528 * MU Beamformer capable - only if SU BFF capable, MU BFF capable
529 * and STA (not AP)
530 */
531 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
532 IEEE80211_VHTCAP_MU_BEAMFORMER_CAPABLE);
533 if (opmode == 1)
534 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
535 IEEE80211_VHTCAP_MU_BEAMFORMER_CAPABLE);
536 val = MIN(val1, val2);
537 if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE) == 0)
538 val = 0;
539 if (opmode != 1) /* Only enable for STA mode */
540 val = 0;
541 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
542 IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
543
544 /*
545 * MU Beamformee capable - only if SU BFE capable, MU BFE capable
546 * and AP (not STA)
547 */
548 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
549 IEEE80211_VHTCAP_MU_BEAMFORMEE_CAPABLE);
550 if (opmode == 1)
551 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
552 IEEE80211_VHTCAP_MU_BEAMFORMEE_CAPABLE);
553 val = MIN(val1, val2);
554 if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE) == 0)
555 val = 0;
556 if (opmode != 0) /* Only enable for AP mode */
557 val = 0;
558 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
559 IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
560
561 /* VHT TXOP PS */
562 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
563 IEEE80211_VHTCAP_VHT_TXOP_PS);
564 if (opmode == 1)
565 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
566 IEEE80211_VHTCAP_VHT_TXOP_PS);
567 val = MIN(val1, val2);
568 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_VHT_TXOP_PS);
569
570 /* HTC_VHT */
571 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
572 IEEE80211_VHTCAP_HTC_VHT);
573 if (opmode == 1)
574 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
575 IEEE80211_VHTCAP_HTC_VHT);
576 val = MIN(val1, val2);
577 new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_HTC_VHT);
578
579 /* A-MPDU length max */
580 /* XXX TODO: we need a userland config knob for this */
581 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
582 IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
583 if (opmode == 1)
584 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
585 IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
586 val = MIN(val1, val2);
587 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
588 IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
589
590 /*
591 * Link adaptation is only valid if HTC-VHT capable is 1.
592 * Otherwise, always set it to 0.
593 */
594 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
595 IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
596 if (opmode == 1)
597 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
598 IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
599 val = MIN(val1, val2);
600 if ((new_vhtcap & IEEE80211_VHTCAP_HTC_VHT) == 0)
601 val = 0;
602 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
603 IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
604
605 /*
606 * The following two options are 0 if the pattern may change, 1 if it
607 * does not change. So, downgrade to the higher value.
608 */
609
610 /* RX antenna pattern */
611 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
612 IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
613 if (opmode == 1)
614 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
615 IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
616 val = MAX(val1, val2);
617 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
618 IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
619
620 /* TX antenna pattern */
621 val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vht_cap.vht_cap_info,
622 IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
623 if (opmode == 1)
624 val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
625 IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
626 val = MAX(val1, val2);
627 new_vhtcap |= _IEEE80211_SHIFTMASK(val,
628 IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
629
630 /*
631 * MCS set - again, we announce what we want to use
632 * based on configuration, device capabilities and
633 * already-learnt vhtcap/vhtinfo IE information.
634 */
635
636 /* MCS set - start with whatever the device supports */
637 vhtcap->supp_mcs.rx_mcs_map = vap->iv_vht_cap.supp_mcs.rx_mcs_map;
638 vhtcap->supp_mcs.rx_highest = 0;
639 vhtcap->supp_mcs.tx_mcs_map = vap->iv_vht_cap.supp_mcs.tx_mcs_map;
640 vhtcap->supp_mcs.tx_highest = 0;
641
642 vhtcap->vht_cap_info = new_vhtcap;
643
644 /*
645 * Now, if we're a STA, mask off whatever the AP doesn't support.
646 * Ie, we continue to state we can receive whatever we can do,
647 * but we only announce that we will transmit rates that meet
648 * the AP requirement.
649 *
650 * Note: 0 - MCS0..7; 1 - MCS0..8; 2 - MCS0..9; 3 = not supported.
651 * We can't just use MIN() because '3' means "no", so special case it.
652 */
653 if (opmode) {
654 for (i = 0; i < 8; i++) {
655 val1 = (vhtcap->supp_mcs.tx_mcs_map >> (i*2)) & 0x3;
656 val2 = (ni->ni_vht_mcsinfo.tx_mcs_map >> (i*2)) & 0x3;
657 val = MIN(val1, val2);
658 if (val1 == 3 || val2 == 3)
659 val = 3;
660 vhtcap->supp_mcs.tx_mcs_map &= ~(0x3 << (i*2));
661 vhtcap->supp_mcs.tx_mcs_map |= (val << (i*2));
662 }
663 }
664 }
665
666 /*
667 * Add a VHTCAP field.
668 *
669 * If in station mode, we announce what we would like our
670 * desired configuration to be.
671 *
672 * Else, we announce our capabilities based on our current
673 * configuration.
674 */
675 uint8_t *
ieee80211_add_vhtcap(uint8_t * frm,struct ieee80211_node * ni)676 ieee80211_add_vhtcap(uint8_t *frm, struct ieee80211_node *ni)
677 {
678 struct ieee80211_vht_cap vhtcap;
679
680 ieee80211_vht_get_vhtcap_ie(ni, &vhtcap, 1);
681
682 frm[0] = IEEE80211_ELEMID_VHT_CAP;
683 frm[1] = sizeof(vhtcap);
684 frm += 2;
685
686 /* 32-bit VHT capability */
687 ADDWORD(frm, vhtcap.vht_cap_info);
688
689 /* suppmcs */
690 ADDSHORT(frm, vhtcap.supp_mcs.rx_mcs_map);
691 ADDSHORT(frm, vhtcap.supp_mcs.rx_highest);
692 ADDSHORT(frm, vhtcap.supp_mcs.tx_mcs_map);
693 ADDSHORT(frm, vhtcap.supp_mcs.tx_highest);
694
695 return (frm);
696 }
697
698 /*
699 * Non-associated probe requests. Add VHT capabilities based on
700 * the current channel configuration. No BSS yet.
701 */
702 uint8_t *
ieee80211_add_vhtcap_ch(uint8_t * frm,struct ieee80211vap * vap,struct ieee80211_channel * c)703 ieee80211_add_vhtcap_ch(uint8_t *frm, struct ieee80211vap *vap,
704 struct ieee80211_channel *c)
705 {
706 struct ieee80211_vht_cap *vhtcap;
707
708 memset(frm, 0, 2 + sizeof(*vhtcap));
709 frm[0] = IEEE80211_ELEMID_VHT_CAP;
710 frm[1] = sizeof(*vhtcap);
711 frm += 2;
712
713 /* 32-bit VHT capability */
714 ADDWORD(frm, vap->iv_vht_cap.vht_cap_info);
715
716 /* supp_mcs */
717 ADDSHORT(frm, vap->iv_vht_cap.supp_mcs.rx_mcs_map);
718 ADDSHORT(frm, vap->iv_vht_cap.supp_mcs.rx_highest);
719 ADDSHORT(frm, vap->iv_vht_cap.supp_mcs.tx_mcs_map);
720 ADDSHORT(frm, vap->iv_vht_cap.supp_mcs.tx_highest);
721
722 return (frm);
723 }
724
725 static uint8_t
ieee80211_vht_get_chwidth_ie(struct ieee80211_channel * c)726 ieee80211_vht_get_chwidth_ie(struct ieee80211_channel *c)
727 {
728
729 /*
730 * XXX TODO: look at the node configuration as
731 * well?
732 */
733
734 if (IEEE80211_IS_CHAN_VHT80P80(c))
735 return IEEE80211_VHT_CHANWIDTH_80P80MHZ;
736 if (IEEE80211_IS_CHAN_VHT160(c))
737 return IEEE80211_VHT_CHANWIDTH_160MHZ;
738 if (IEEE80211_IS_CHAN_VHT80(c))
739 return IEEE80211_VHT_CHANWIDTH_80MHZ;
740 if (IEEE80211_IS_CHAN_VHT40(c))
741 return IEEE80211_VHT_CHANWIDTH_USE_HT;
742 if (IEEE80211_IS_CHAN_VHT20(c))
743 return IEEE80211_VHT_CHANWIDTH_USE_HT;
744
745 /* We shouldn't get here */
746 printf("%s: called on a non-VHT channel (freq=%d, flags=0x%08x\n",
747 __func__, (int) c->ic_freq, c->ic_flags);
748 return IEEE80211_VHT_CHANWIDTH_USE_HT;
749 }
750
751 /*
752 * Note: this just uses the current channel information;
753 * it doesn't use the node info after parsing.
754 *
755 * XXX TODO: need to make the basic MCS set configurable.
756 * XXX TODO: read 802.11-2013 to determine what to set
757 * chwidth to when scanning. I have a feeling
758 * it isn't involved in scanning and we shouldn't
759 * be sending it; and I don't yet know what to set
760 * it to for IBSS or hostap where the peer may be
761 * a completely different channel width to us.
762 */
763 uint8_t *
ieee80211_add_vhtinfo(uint8_t * frm,struct ieee80211_node * ni)764 ieee80211_add_vhtinfo(uint8_t *frm, struct ieee80211_node *ni)
765 {
766
767 frm[0] = IEEE80211_ELEMID_VHT_OPMODE;
768 frm[1] = sizeof(struct ieee80211_vht_operation);
769 frm += 2;
770
771 /* 8-bit chanwidth */
772 *frm++ = ieee80211_vht_get_chwidth_ie(ni->ni_chan);
773
774 /* 8-bit freq1 */
775 *frm++ = ni->ni_chan->ic_vht_ch_freq1;
776
777 /* 8-bit freq2 */
778 *frm++ = ni->ni_chan->ic_vht_ch_freq2;
779
780 /* 16-bit basic MCS set - just MCS0..7 for NSS=1 for now */
781 ADDSHORT(frm, 0xfffc);
782
783 return (frm);
784 }
785
786 void
ieee80211_vht_update_cap(struct ieee80211_node * ni,const uint8_t * vhtcap_ie,const uint8_t * vhtop_ie)787 ieee80211_vht_update_cap(struct ieee80211_node *ni, const uint8_t *vhtcap_ie,
788 const uint8_t *vhtop_ie)
789 {
790
791 ieee80211_parse_vhtcap(ni, vhtcap_ie);
792 ieee80211_parse_vhtopmode(ni, vhtop_ie);
793 }
794
795 static struct ieee80211_channel *
findvhtchan(struct ieee80211com * ic,struct ieee80211_channel * c,int vhtflags)796 findvhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int vhtflags)
797 {
798
799 return (ieee80211_find_channel(ic, c->ic_freq,
800 (c->ic_flags & ~IEEE80211_CHAN_VHT) | vhtflags));
801 }
802
803 /*
804 * Handle channel promotion to VHT, similar to ieee80211_ht_adjust_channel().
805 */
806 struct ieee80211_channel *
ieee80211_vht_adjust_channel(struct ieee80211com * ic,struct ieee80211_channel * chan,int flags)807 ieee80211_vht_adjust_channel(struct ieee80211com *ic,
808 struct ieee80211_channel *chan, int flags)
809 {
810 struct ieee80211_channel *c;
811
812 /* First case - handle channel demotion - if VHT isn't set */
813 if ((flags & IEEE80211_FVHT_MASK) == 0) {
814 #if 0
815 printf("%s: demoting channel %d/0x%08x\n", __func__,
816 chan->ic_ieee, chan->ic_flags);
817 #endif
818 c = ieee80211_find_channel(ic, chan->ic_freq,
819 chan->ic_flags & ~IEEE80211_CHAN_VHT);
820 if (c == NULL)
821 c = chan;
822 #if 0
823 printf("%s: .. to %d/0x%08x\n", __func__,
824 c->ic_ieee, c->ic_flags);
825 #endif
826 return (c);
827 }
828
829 /*
830 * We can upgrade to VHT - attempt to do so
831 *
832 * Note: we don't clear the HT flags, these are the hints
833 * for HT40U/HT40D when selecting VHT40 or larger channels.
834 */
835 c = NULL;
836 if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT160))
837 c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT160);
838
839 if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT80P80))
840 c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT80P80);
841
842 if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT80))
843 c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT80);
844
845 if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT40))
846 c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT40U);
847 if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT40))
848 c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT40D);
849 /*
850 * If we get here, VHT20 is always possible because we checked
851 * for IEEE80211_FVHT_VHT above.
852 */
853 if (c == NULL)
854 c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT20);
855
856 if (c != NULL)
857 chan = c;
858
859 #if 0
860 printf("%s: selected %d/0x%08x\n", __func__, c->ic_ieee, c->ic_flags);
861 #endif
862 return (chan);
863 }
864
865 /*
866 * Calculate the VHT operation IE for a given node.
867 *
868 * This includes calculating the suitable channel width/parameters
869 * and basic MCS set.
870 *
871 * TODO: ensure I read 9.7.11 Rate Selection for VHT STAs.
872 * TODO: ensure I read 10.39.7 - BSS Basic VHT-MCS and NSS set operation.
873 */
874 void
ieee80211_vht_get_vhtinfo_ie(struct ieee80211_node * ni,struct ieee80211_vht_operation * vhtop,int opmode)875 ieee80211_vht_get_vhtinfo_ie(struct ieee80211_node *ni,
876 struct ieee80211_vht_operation *vhtop, int opmode)
877 {
878 printf("%s: called; TODO!\n", __func__);
879 }
880