?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Revert "HID: Invert HWHEEL mappings for some Logitech mice"
[wandboard.git] / net / mac80211 / util.c
blobcee4884b9d06215f86b73630362fae1f9ab87168
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/bitmap.h>
23 #include <net/net_namespace.h>
24 #include <net/cfg80211.h>
25 #include <net/rtnetlink.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wme.h"
31
32 /* privid for wiphys to determine whether they belong to us or not */
33 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
34
35 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
36 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
37 const unsigned char rfc1042_header[] __aligned(2) =
38 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
39
40 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
41 const unsigned char bridge_tunnel_header[] __aligned(2) =
42 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
43
44
45 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
47 {
48 __le16 fc = hdr->frame_control;
49
50 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
51 if (len < 16)
52 return NULL;
53
54 if (ieee80211_is_data(fc)) {
55 if (len < 24) /* drop incorrect hdr len (data) */
56 return NULL;
57
58 if (ieee80211_has_a4(fc))
59 return NULL;
60 if (ieee80211_has_tods(fc))
61 return hdr->addr1;
62 if (ieee80211_has_fromds(fc))
63 return hdr->addr2;
64
65 return hdr->addr3;
66 }
67
68 if (ieee80211_is_mgmt(fc)) {
69 if (len < 24) /* drop incorrect hdr len (mgmt) */
70 return NULL;
71 return hdr->addr3;
72 }
73
74 if (ieee80211_is_ctl(fc)) {
75 if(ieee80211_is_pspoll(fc))
76 return hdr->addr1;
77
78 if (ieee80211_is_back_req(fc)) {
79 switch (type) {
80 case NL80211_IFTYPE_STATION:
81 return hdr->addr2;
82 case NL80211_IFTYPE_AP:
83 case NL80211_IFTYPE_AP_VLAN:
84 return hdr->addr1;
85 default:
86 break; /* fall through to the return */
87 }
88 }
89 }
90
91 return NULL;
92 }
93
94 unsigned int ieee80211_hdrlen(__le16 fc)
95 {
96 unsigned int hdrlen = 24;
97
98 if (ieee80211_is_data(fc)) {
99 if (ieee80211_has_a4(fc))
100 hdrlen = 30;
101 if (ieee80211_is_data_qos(fc))
102 hdrlen += IEEE80211_QOS_CTL_LEN;
103 goto out;
104 }
105
106 if (ieee80211_is_ctl(fc)) {
107 /*
108 * ACK and CTS are 10 bytes, all others 16. To see how
109 * to get this condition consider
110 * subtype mask: 0b0000000011110000 (0x00F0)
111 * ACK subtype: 0b0000000011010000 (0x00D0)
112 * CTS subtype: 0b0000000011000000 (0x00C0)
113 * bits that matter: ^^^ (0x00E0)
114 * value of those: 0b0000000011000000 (0x00C0)
115 */
116 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
117 hdrlen = 10;
118 else
119 hdrlen = 16;
120 }
121 out:
122 return hdrlen;
123 }
124 EXPORT_SYMBOL(ieee80211_hdrlen);
125
126 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
127 {
128 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
129 unsigned int hdrlen;
130
131 if (unlikely(skb->len < 10))
132 return 0;
133 hdrlen = ieee80211_hdrlen(hdr->frame_control);
134 if (unlikely(hdrlen > skb->len))
135 return 0;
136 return hdrlen;
137 }
138 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
139
140 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
141 {
142 int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
143 /* 7.1.3.5a.2 */
144 switch (ae) {
145 case 0:
146 return 6;
147 case 1:
148 return 12;
149 case 2:
150 return 18;
151 case 3:
152 return 24;
153 default:
154 return 6;
155 }
156 }
157
158 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
159 {
160 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
161
162 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
163 if (tx->extra_frag) {
164 struct ieee80211_hdr *fhdr;
165 int i;
166 for (i = 0; i < tx->num_extra_frag; i++) {
167 fhdr = (struct ieee80211_hdr *)
168 tx->extra_frag[i]->data;
169 fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
170 }
171 }
172 }
173
174 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
175 int rate, int erp, int short_preamble)
176 {
177 int dur;
178
179 /* calculate duration (in microseconds, rounded up to next higher
180 * integer if it includes a fractional microsecond) to send frame of
181 * len bytes (does not include FCS) at the given rate. Duration will
182 * also include SIFS.
183 *
184 * rate is in 100 kbps, so divident is multiplied by 10 in the
185 * DIV_ROUND_UP() operations.
186 */
187
188 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
189 /*
190 * OFDM:
191 *
192 * N_DBPS = DATARATE x 4
193 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
194 * (16 = SIGNAL time, 6 = tail bits)
195 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
196 *
197 * T_SYM = 4 usec
198 * 802.11a - 17.5.2: aSIFSTime = 16 usec
199 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
200 * signal ext = 6 usec
201 */
202 dur = 16; /* SIFS + signal ext */
203 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
204 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
205 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
206 4 * rate); /* T_SYM x N_SYM */
207 } else {
208 /*
209 * 802.11b or 802.11g with 802.11b compatibility:
210 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
211 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
212 *
213 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
214 * aSIFSTime = 10 usec
215 * aPreambleLength = 144 usec or 72 usec with short preamble
216 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
217 */
218 dur = 10; /* aSIFSTime = 10 usec */
219 dur += short_preamble ? (72 + 24) : (144 + 48);
220
221 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
222 }
223
224 return dur;
225 }
226
227 /* Exported duration function for driver use */
228 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
229 struct ieee80211_vif *vif,
230 size_t frame_len,
231 struct ieee80211_rate *rate)
232 {
233 struct ieee80211_local *local = hw_to_local(hw);
234 struct ieee80211_sub_if_data *sdata;
235 u16 dur;
236 int erp;
237 bool short_preamble = false;
238
239 erp = 0;
240 if (vif) {
241 sdata = vif_to_sdata(vif);
242 short_preamble = sdata->bss_conf.use_short_preamble;
243 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
244 erp = rate->flags & IEEE80211_RATE_ERP_G;
245 }
246
247 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
248 short_preamble);
249
250 return cpu_to_le16(dur);
251 }
252 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
253
254 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
255 struct ieee80211_vif *vif, size_t frame_len,
256 const struct ieee80211_tx_info *frame_txctl)
257 {
258 struct ieee80211_local *local = hw_to_local(hw);
259 struct ieee80211_rate *rate;
260 struct ieee80211_sub_if_data *sdata;
261 bool short_preamble;
262 int erp;
263 u16 dur;
264 struct ieee80211_supported_band *sband;
265
266 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
267
268 short_preamble = false;
269
270 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
271
272 erp = 0;
273 if (vif) {
274 sdata = vif_to_sdata(vif);
275 short_preamble = sdata->bss_conf.use_short_preamble;
276 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
277 erp = rate->flags & IEEE80211_RATE_ERP_G;
278 }
279
280 /* CTS duration */
281 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
282 erp, short_preamble);
283 /* Data frame duration */
284 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
285 erp, short_preamble);
286 /* ACK duration */
287 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
288 erp, short_preamble);
289
290 return cpu_to_le16(dur);
291 }
292 EXPORT_SYMBOL(ieee80211_rts_duration);
293
294 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
295 struct ieee80211_vif *vif,
296 size_t frame_len,
297 const struct ieee80211_tx_info *frame_txctl)
298 {
299 struct ieee80211_local *local = hw_to_local(hw);
300 struct ieee80211_rate *rate;
301 struct ieee80211_sub_if_data *sdata;
302 bool short_preamble;
303 int erp;
304 u16 dur;
305 struct ieee80211_supported_band *sband;
306
307 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
308
309 short_preamble = false;
310
311 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
312 erp = 0;
313 if (vif) {
314 sdata = vif_to_sdata(vif);
315 short_preamble = sdata->bss_conf.use_short_preamble;
316 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
317 erp = rate->flags & IEEE80211_RATE_ERP_G;
318 }
319
320 /* Data frame duration */
321 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
322 erp, short_preamble);
323 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
324 /* ACK duration */
325 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
326 erp, short_preamble);
327 }
328
329 return cpu_to_le16(dur);
330 }
331 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
332
333 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
334 {
335 struct ieee80211_local *local = hw_to_local(hw);
336
337 if (test_bit(queue, local->queues_pending)) {
338 set_bit(queue, local->queues_pending_run);
339 tasklet_schedule(&local->tx_pending_tasklet);
340 } else {
341 netif_wake_subqueue(local->mdev, queue);
342 }
343 }
344 EXPORT_SYMBOL(ieee80211_wake_queue);
345
346 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
347 {
348 struct ieee80211_local *local = hw_to_local(hw);
349
350 netif_stop_subqueue(local->mdev, queue);
351 }
352 EXPORT_SYMBOL(ieee80211_stop_queue);
353
354 void ieee80211_stop_queues(struct ieee80211_hw *hw)
355 {
356 int i;
357
358 for (i = 0; i < ieee80211_num_queues(hw); i++)
359 ieee80211_stop_queue(hw, i);
360 }
361 EXPORT_SYMBOL(ieee80211_stop_queues);
362
363 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
364 {
365 struct ieee80211_local *local = hw_to_local(hw);
366 return __netif_subqueue_stopped(local->mdev, queue);
367 }
368 EXPORT_SYMBOL(ieee80211_queue_stopped);
369
370 void ieee80211_wake_queues(struct ieee80211_hw *hw)
371 {
372 int i;
373
374 for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
375 ieee80211_wake_queue(hw, i);
376 }
377 EXPORT_SYMBOL(ieee80211_wake_queues);
378
379 void ieee80211_iterate_active_interfaces(
380 struct ieee80211_hw *hw,
381 void (*iterator)(void *data, u8 *mac,
382 struct ieee80211_vif *vif),
383 void *data)
384 {
385 struct ieee80211_local *local = hw_to_local(hw);
386 struct ieee80211_sub_if_data *sdata;
387
388 rtnl_lock();
389
390 list_for_each_entry(sdata, &local->interfaces, list) {
391 switch (sdata->vif.type) {
392 case __NL80211_IFTYPE_AFTER_LAST:
393 case NL80211_IFTYPE_UNSPECIFIED:
394 case NL80211_IFTYPE_MONITOR:
395 case NL80211_IFTYPE_AP_VLAN:
396 continue;
397 case NL80211_IFTYPE_AP:
398 case NL80211_IFTYPE_STATION:
399 case NL80211_IFTYPE_ADHOC:
400 case NL80211_IFTYPE_WDS:
401 case NL80211_IFTYPE_MESH_POINT:
402 break;
403 }
404 if (netif_running(sdata->dev))
405 iterator(data, sdata->dev->dev_addr,
406 &sdata->vif);
407 }
408
409 rtnl_unlock();
410 }
411 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
412
413 void ieee80211_iterate_active_interfaces_atomic(
414 struct ieee80211_hw *hw,
415 void (*iterator)(void *data, u8 *mac,
416 struct ieee80211_vif *vif),
417 void *data)
418 {
419 struct ieee80211_local *local = hw_to_local(hw);
420 struct ieee80211_sub_if_data *sdata;
421
422 rcu_read_lock();
423
424 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
425 switch (sdata->vif.type) {
426 case __NL80211_IFTYPE_AFTER_LAST:
427 case NL80211_IFTYPE_UNSPECIFIED:
428 case NL80211_IFTYPE_MONITOR:
429 case NL80211_IFTYPE_AP_VLAN:
430 continue;
431 case NL80211_IFTYPE_AP:
432 case NL80211_IFTYPE_STATION:
433 case NL80211_IFTYPE_ADHOC:
434 case NL80211_IFTYPE_WDS:
435 case NL80211_IFTYPE_MESH_POINT:
436 break;
437 }
438 if (netif_running(sdata->dev))
439 iterator(data, sdata->dev->dev_addr,
440 &sdata->vif);
441 }
442
443 rcu_read_unlock();
444 }
445 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
446
447 void ieee802_11_parse_elems(u8 *start, size_t len,
448 struct ieee802_11_elems *elems)
449 {
450 size_t left = len;
451 u8 *pos = start;
452
453 memset(elems, 0, sizeof(*elems));
454 elems->ie_start = start;
455 elems->total_len = len;
456
457 while (left >= 2) {
458 u8 id, elen;
459
460 id = *pos++;
461 elen = *pos++;
462 left -= 2;
463
464 if (elen > left)
465 return;
466
467 switch (id) {
468 case WLAN_EID_SSID:
469 elems->ssid = pos;
470 elems->ssid_len = elen;
471 break;
472 case WLAN_EID_SUPP_RATES:
473 elems->supp_rates = pos;
474 elems->supp_rates_len = elen;
475 break;
476 case WLAN_EID_FH_PARAMS:
477 elems->fh_params = pos;
478 elems->fh_params_len = elen;
479 break;
480 case WLAN_EID_DS_PARAMS:
481 elems->ds_params = pos;
482 elems->ds_params_len = elen;
483 break;
484 case WLAN_EID_CF_PARAMS:
485 elems->cf_params = pos;
486 elems->cf_params_len = elen;
487 break;
488 case WLAN_EID_TIM:
489 elems->tim = pos;
490 elems->tim_len = elen;
491 break;
492 case WLAN_EID_IBSS_PARAMS:
493 elems->ibss_params = pos;
494 elems->ibss_params_len = elen;
495 break;
496 case WLAN_EID_CHALLENGE:
497 elems->challenge = pos;
498 elems->challenge_len = elen;
499 break;
500 case WLAN_EID_WPA:
501 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
502 pos[2] == 0xf2) {
503 /* Microsoft OUI (00:50:F2) */
504 if (pos[3] == 1) {
505 /* OUI Type 1 - WPA IE */
506 elems->wpa = pos;
507 elems->wpa_len = elen;
508 } else if (elen >= 5 && pos[3] == 2) {
509 if (pos[4] == 0) {
510 elems->wmm_info = pos;
511 elems->wmm_info_len = elen;
512 } else if (pos[4] == 1) {
513 elems->wmm_param = pos;
514 elems->wmm_param_len = elen;
515 }
516 }
517 }
518 break;
519 case WLAN_EID_RSN:
520 elems->rsn = pos;
521 elems->rsn_len = elen;
522 break;
523 case WLAN_EID_ERP_INFO:
524 elems->erp_info = pos;
525 elems->erp_info_len = elen;
526 break;
527 case WLAN_EID_EXT_SUPP_RATES:
528 elems->ext_supp_rates = pos;
529 elems->ext_supp_rates_len = elen;
530 break;
531 case WLAN_EID_HT_CAPABILITY:
532 if (elen >= sizeof(struct ieee80211_ht_cap))
533 elems->ht_cap_elem = (void *)pos;
534 break;
535 case WLAN_EID_HT_EXTRA_INFO:
536 if (elen >= sizeof(struct ieee80211_ht_addt_info))
537 elems->ht_info_elem = (void *)pos;
538 break;
539 case WLAN_EID_MESH_ID:
540 elems->mesh_id = pos;
541 elems->mesh_id_len = elen;
542 break;
543 case WLAN_EID_MESH_CONFIG:
544 elems->mesh_config = pos;
545 elems->mesh_config_len = elen;
546 break;
547 case WLAN_EID_PEER_LINK:
548 elems->peer_link = pos;
549 elems->peer_link_len = elen;
550 break;
551 case WLAN_EID_PREQ:
552 elems->preq = pos;
553 elems->preq_len = elen;
554 break;
555 case WLAN_EID_PREP:
556 elems->prep = pos;
557 elems->prep_len = elen;
558 break;
559 case WLAN_EID_PERR:
560 elems->perr = pos;
561 elems->perr_len = elen;
562 break;
563 case WLAN_EID_CHANNEL_SWITCH:
564 elems->ch_switch_elem = pos;
565 elems->ch_switch_elem_len = elen;
566 break;
567 case WLAN_EID_QUIET:
568 if (!elems->quiet_elem) {
569 elems->quiet_elem = pos;
570 elems->quiet_elem_len = elen;
571 }
572 elems->num_of_quiet_elem++;
573 break;
574 case WLAN_EID_COUNTRY:
575 elems->country_elem = pos;
576 elems->country_elem_len = elen;
577 break;
578 case WLAN_EID_PWR_CONSTRAINT:
579 elems->pwr_constr_elem = pos;
580 elems->pwr_constr_elem_len = elen;
581 break;
582 default:
583 break;
584 }
585
586 left -= elen;
587 pos += elen;
588 }
589 }
590
591 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
592 {
593 struct ieee80211_local *local = sdata->local;
594 struct ieee80211_tx_queue_params qparam;
595 int i;
596
597 if (!local->ops->conf_tx)
598 return;
599
600 memset(&qparam, 0, sizeof(qparam));
601
602 qparam.aifs = 2;
603
604 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
605 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
606 qparam.cw_min = 31;
607 else
608 qparam.cw_min = 15;
609
610 qparam.cw_max = 1023;
611 qparam.txop = 0;
612
613 for (i = 0; i < local_to_hw(local)->queues; i++)
614 local->ops->conf_tx(local_to_hw(local), i, &qparam);
615 }
616
617 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
618 int encrypt)
619 {
620 skb->dev = sdata->local->mdev;
621 skb_set_mac_header(skb, 0);
622 skb_set_network_header(skb, 0);
623 skb_set_transport_header(skb, 0);
624
625 skb->iif = sdata->dev->ifindex;
626 skb->do_not_encrypt = !encrypt;
627
628 dev_queue_xmit(skb);
629 }
630
631 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
632 {
633 int ret = -EINVAL;
634 struct ieee80211_channel *chan;
635 struct ieee80211_local *local = sdata->local;
636
637 chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
638
639 if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
640 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
641 chan->flags & IEEE80211_CHAN_NO_IBSS) {
642 printk(KERN_DEBUG "%s: IBSS not allowed on frequency "
643 "%d MHz\n", sdata->dev->name, chan->center_freq);
644 return ret;
645 }
646 local->oper_channel = chan;
647
648 if (local->sw_scanning || local->hw_scanning)
649 ret = 0;
650 else
651 ret = ieee80211_hw_config(local);
652
653 rate_control_clear(local);
654 }
655
656 return ret;
657 }
658
659 u64 ieee80211_mandatory_rates(struct ieee80211_local *local,
660 enum ieee80211_band band)
661 {
662 struct ieee80211_supported_band *sband;
663 struct ieee80211_rate *bitrates;
664 u64 mandatory_rates;
665 enum ieee80211_rate_flags mandatory_flag;
666 int i;
667
668 sband = local->hw.wiphy->bands[band];
669 if (!sband) {
670 WARN_ON(1);
671 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
672 }
673
674 if (band == IEEE80211_BAND_2GHZ)
675 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
676 else
677 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
678
679 bitrates = sband->bitrates;
680 mandatory_rates = 0;
681 for (i = 0; i < sband->n_bitrates; i++)
682 if (bitrates[i].flags & mandatory_flag)
683 mandatory_rates |= BIT(i);
684 return mandatory_rates;
685 }
WandBoard kernel