Packets/80211Bundle: Read-only radiotap reimplementation

[senf.git] / senf / Packets / 80211Bundle / radiotap / radiotap_iter.h

diff --git a/senf/Packets/80211Bundle/radiotap/radiotap_iter.h b/senf/Packets/80211Bundle/radiotap/radiotap_iter.h
new file mode 100644 (file)
index 0000000..b768c85
--- /dev/null
+++ b/senf/Packets/80211Bundle/radiotap/radiotap_iter.h
@@ -0,0 +1,96 @@
+#ifndef __RADIOTAP_ITER_H
+#define __RADIOTAP_ITER_H
+
+#include <stdint.h>
+#include "radiotap.h"
+
+/* Radiotap header iteration
+ *   implemented in radiotap.c
+ */
+
+struct radiotap_override {
+       uint8_t field;
+       uint8_t align:4, size:4;
+};
+
+struct radiotap_align_size {
+       uint8_t align:4, size:4;
+};
+
+struct ieee80211_radiotap_namespace {
+       const struct radiotap_align_size *align_size;
+       int n_bits;
+       uint32_t oui;
+       uint8_t subns;
+};
+
+struct ieee80211_radiotap_vendor_namespaces {
+       const struct ieee80211_radiotap_namespace *ns;
+       int n_ns;
+};
+
+/**
+ * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
+ * @this_arg_index: index of current arg, valid after each successful call
+ *     to ieee80211_radiotap_iterator_next()
+ * @this_arg: pointer to current radiotap arg; it is valid after each
+ *     call to ieee80211_radiotap_iterator_next() but also after
+ *     ieee80211_radiotap_iterator_init() where it will point to
+ *     the beginning of the actual data portion
+ * @this_arg_size: length of the current arg, for convenience
+ * @current_namespace: pointer to the current namespace definition
+ *     (or internally %NULL if the current namespace is unknown)
+ * @is_radiotap_ns: indicates whether the current namespace is the default
+ *     radiotap namespace or not
+ *
+ * @overrides: override standard radiotap fields
+ * @n_overrides: number of overrides
+ *
+ * @_rtheader: pointer to the radiotap header we are walking through
+ * @_max_length: length of radiotap header in cpu byte ordering
+ * @_arg_index: next argument index
+ * @_arg: next argument pointer
+ * @_next_bitmap: internal pointer to next present u32
+ * @_bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present
+ * @_vns: vendor namespace definitions
+ * @_next_ns_data: beginning of the next namespace's data
+ * @_reset_on_ext: internal; reset the arg index to 0 when going to the
+ *     next bitmap word
+ *
+ * Describes the radiotap parser state. Fields prefixed with an underscore
+ * must not be used by users of the parser, only by the parser internally.
+ */
+
+struct ieee80211_radiotap_iterator {
+       struct ieee80211_radiotap_header *_rtheader;
+       const struct ieee80211_radiotap_vendor_namespaces *_vns;
+       const struct ieee80211_radiotap_namespace *current_namespace;
+
+       unsigned char *_arg, *_next_ns_data;
+       uint32_t *_next_bitmap;
+
+       unsigned char *this_arg;
+#ifdef RADIOTAP_SUPPORT_OVERRIDES
+       const struct radiotap_override *overrides;
+       int n_overrides;
+#endif
+       int this_arg_index;
+       int this_arg_size;
+
+       int is_radiotap_ns;
+
+       int _max_length;
+       int _arg_index;
+       uint32_t _bitmap_shifter;
+       int _reset_on_ext;
+};
+
+extern int ieee80211_radiotap_iterator_init(
+       struct ieee80211_radiotap_iterator *iterator,
+       struct ieee80211_radiotap_header *radiotap_header,
+       int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns);
+
+extern int ieee80211_radiotap_iterator_next(
+       struct ieee80211_radiotap_iterator *iterator);
+
+#endif /* __RADIOTAP_ITER_H */