centos man page for ieee80211_get_hdrlen_from_skb

IEEE80211_GET_HDRLEN(9) 					 Utility functions					   IEEE80211_GET_HDRLEN(9)

NAME
       ieee80211_get_hdrlen_from_skb - get header length from data

SYNOPSIS
       unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff * skb);

ARGUMENTS
       skb
	   the frame

DESCRIPTION
       Given an skb with a raw 802.11 header at the data pointer this function returns the 802.11 header length.

RETURN
       The 802.11 header length in bytes (not including encryption headers). Or 0 if the data in the sk_buff is too short to contain a valid
       802.11 header.

AUTHOR
       Johannes Berg <johannes@sipsolutions.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   IEEE80211_GET_HDRLEN(9)