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mac80211: add utility function to get header length

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Take a __le16 directly rather than a host-endian value.

Signed-off-by: Harvey Harrison <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
This commit is contained in:
Harvey Harrison 2008-06-11 14:21:57 -07:00 • committed by John W. Linville
commit 6693be7124
2 changed files with 38 additions and 0 deletions
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32
net/mac80211/util.c
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@ -133,6 +133,38 @@ int ieee80211_get_hdrlen(u16 fc)
}
EXPORT_SYMBOL(ieee80211_get_hdrlen);
unsigned int ieee80211_hdrlen(__le16 fc)
{
unsigned int hdrlen = 24;
if (ieee80211_is_data(fc)) {
if (ieee80211_has_a4(fc))
hdrlen = 30;
if (ieee80211_is_data_qos(fc))
hdrlen += IEEE80211_QOS_CTL_LEN;
goto out;
}
if (ieee80211_is_ctl(fc)) {
/*
* ACK and CTS are 10 bytes, all others 16. To see how
* to get this condition consider
* subtype mask: 0b0000000011110000 (0x00F0)
* ACK subtype: 0b0000000011010000 (0x00D0)
* CTS subtype: 0b0000000011000000 (0x00C0)
* bits that matter: ^^^ (0x00E0)
* value of those: 0b0000000011000000 (0x00C0)
*/
if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
hdrlen = 10;
else
hdrlen = 16;
}
out:
return hdrlen;
}
EXPORT_SYMBOL(ieee80211_hdrlen);
unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
{
const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;