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authorAndy Green <andy@warmcat.com>2007-07-10 19:29:38 +0200
committerJohn W. Linville <linville@tuxdriver.com>2007-07-12 16:07:24 -0400
commit179f831bc33104d14deb54a52b7a8b43433f8ccc (patch)
tree8834c628a493fbd4aff1e09dc77b334154c6a050 /include/net/cfg80211.h
parent08d1f2155cd5b21bb3848f46d9747afb1ccd249d (diff)
[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 <andy@warmcat.com> Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'include/net/cfg80211.h')
-rw-r--r--include/net/cfg80211.h38
1 files changed, 38 insertions, 0 deletions
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 <johannes@sipsolutions.net>
*/
+
+/* 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;