diff options
Diffstat (limited to 'include/linux/ieee80211.h')
| -rw-r--r-- | include/linux/ieee80211.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 272f8c8c90da..30621c27159f 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -16,6 +16,7 @@ #define IEEE80211_H #include <linux/types.h> +#include <asm/byteorder.h> #define FCS_LEN 4 @@ -350,4 +351,64 @@ enum ieee80211_eid { #define WLAN_MAX_KEY_LEN 32 +/** + * ieee80211_get_SA - get pointer to SA + * + * Given an 802.11 frame, this function returns the offset + * to the source address (SA). It does not verify that the + * header is long enough to contain the address, and the + * header must be long enough to contain the frame control + * field. + * + * @hdr: the frame + */ +static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr) +{ + u8 *raw = (u8 *) hdr; + u8 tofrom = (*(raw+1)) & 3; /* get the TODS and FROMDS bits */ + + switch (tofrom) { + case 2: + return hdr->addr3; + case 3: + return hdr->addr4; + } + return hdr->addr2; +} + +/** + * ieee80211_get_DA - get pointer to DA + * + * Given an 802.11 frame, this function returns the offset + * to the destination address (DA). It does not verify that + * the header is long enough to contain the address, and the + * header must be long enough to contain the frame control + * field. + * + * @hdr: the frame + */ +static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr) +{ + u8 *raw = (u8 *) hdr; + u8 to_ds = (*(raw+1)) & 1; /* get the TODS bit */ + + if (to_ds) + return hdr->addr3; + return hdr->addr1; +} + +/** + * ieee80211_get_morefrag - determine whether the MOREFRAGS bit is set + * + * This function determines whether the "more fragments" bit is set + * in the frame. + * + * @hdr: the frame + */ +static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr) +{ + return (le16_to_cpu(hdr->frame_control) & + IEEE80211_FCTL_MOREFRAGS) != 0; +} + #endif /* IEEE80211_H */ |