From 179f831bc33104d14deb54a52b7a8b43433f8ccc Mon Sep 17 00:00:00 2001 From: Andy Green Date: Tue, 10 Jul 2007 19:29:38 +0200 Subject: [PATCH] cfg80211: Radiotap parser Generic code to walk through the fields in a radiotap header, accounting for nasties like extended "field present" bitfields and alignment rules Signed-off-by: Andy Green Signed-off-by: Jiri Benc Signed-off-by: John W. Linville --- include/net/cfg80211.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'include/net/cfg80211.h') diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 88171f8ce58..7edaef6b29d 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -11,6 +11,44 @@ * Copyright 2006 Johannes Berg */ + +/* Radiotap header iteration + * implemented in net/wireless/radiotap.c + * docs in Documentation/networking/radiotap-headers.txt + */ +/** + * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args + * @rtheader: pointer to the radiotap header we are walking through + * @max_length: length of radiotap header in cpu byte ordering + * @this_arg_index: IEEE80211_RADIOTAP_... index of current arg + * @this_arg: pointer to current radiotap arg + * @arg_index: internal next argument index + * @arg: internal next argument pointer + * @next_bitmap: internal pointer to next present u32 + * @bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present + */ + +struct ieee80211_radiotap_iterator { + struct ieee80211_radiotap_header *rtheader; + int max_length; + int this_arg_index; + u8 *this_arg; + + int arg_index; + u8 *arg; + __le32 *next_bitmap; + u32 bitmap_shifter; +}; + +extern int ieee80211_radiotap_iterator_init( + struct ieee80211_radiotap_iterator *iterator, + struct ieee80211_radiotap_header *radiotap_header, + int max_length); + +extern int ieee80211_radiotap_iterator_next( + struct ieee80211_radiotap_iterator *iterator); + + /* from net/wireless.h */ struct wiphy; -- cgit v1.2.3