diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/ieee80211.h | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 53563d53b5ad..c52e7fba4e40 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h | |||
@@ -540,7 +540,7 @@ struct ieee80211_tim_ie { | |||
540 | u8 dtim_period; | 540 | u8 dtim_period; |
541 | u8 bitmap_ctrl; | 541 | u8 bitmap_ctrl; |
542 | /* variable size: 1 - 251 bytes */ | 542 | /* variable size: 1 - 251 bytes */ |
543 | u8 virtual_map[0]; | 543 | u8 virtual_map[1]; |
544 | } __attribute__ ((packed)); | 544 | } __attribute__ ((packed)); |
545 | 545 | ||
546 | #define WLAN_SA_QUERY_TR_ID_LEN 16 | 546 | #define WLAN_SA_QUERY_TR_ID_LEN 16 |
@@ -1392,4 +1392,34 @@ static inline unsigned long ieee80211_tu_to_usec(unsigned long tu) | |||
1392 | return 1024 * tu; | 1392 | return 1024 * tu; |
1393 | } | 1393 | } |
1394 | 1394 | ||
1395 | /** | ||
1396 | * ieee80211_check_tim - check if AID bit is set in TIM | ||
1397 | * @tim: the TIM IE | ||
1398 | * @tim_len: length of the TIM IE | ||
1399 | * @aid: the AID to look for | ||
1400 | */ | ||
1401 | static inline bool ieee80211_check_tim(struct ieee80211_tim_ie *tim, | ||
1402 | u8 tim_len, u16 aid) | ||
1403 | { | ||
1404 | u8 mask; | ||
1405 | u8 index, indexn1, indexn2; | ||
1406 | |||
1407 | if (unlikely(!tim || tim_len < sizeof(*tim))) | ||
1408 | return false; | ||
1409 | |||
1410 | aid &= 0x3fff; | ||
1411 | index = aid / 8; | ||
1412 | mask = 1 << (aid & 7); | ||
1413 | |||
1414 | indexn1 = tim->bitmap_ctrl & 0xfe; | ||
1415 | indexn2 = tim_len + indexn1 - 4; | ||
1416 | |||
1417 | if (index < indexn1 || index > indexn2) | ||
1418 | return false; | ||
1419 | |||
1420 | index -= indexn1; | ||
1421 | |||
1422 | return !!(tim->virtual_map[index] & mask); | ||
1423 | } | ||
1424 | |||
1395 | #endif /* LINUX_IEEE80211_H */ | 1425 | #endif /* LINUX_IEEE80211_H */ |