X-Git-Url: https://jxself.org/git/?p=carl9170fw.git;a=blobdiff_plain;f=include%2Flinux%2Fieee80211.h;h=e71604bdb53b1e1ffe1a1c863db0e7dd85473684;hp=619bce2e5a68cbae69c1b78eb57b141a7b3dd79f;hb=1a1623e0968ebe738c2f6e3f6e2d95d74f9fa187;hpb=21967f557bfd4e7d5f2b04c4f8996d4a5575b5ff

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 619bce2..e71604b 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -3172,4 +3172,57 @@ static inline bool ieee80211_check_tim(const struct ieee80211_tim_ie *tim,
 #define TU_TO_JIFFIES(x)       (usecs_to_jiffies((x) * 1024))
 #define TU_TO_EXP_TIME(x)      (jiffies + TU_TO_JIFFIES(x))
 
+struct element {
+	u8 id;
+	u8 datalen;
+	u8 data[];
+};
+
+/* element iteration helpers */
+#define for_each_element(element, _data, _datalen)			\
+	for (element = (void *)(_data);					\
+	     (u8 *)(_data) + (_datalen) - (u8 *)element >=		\
+		sizeof(*element) &&					\
+	     (u8 *)(_data) + (_datalen) - (u8 *)element >=		\
+		sizeof(*element) + element->datalen;			\
+	     element = (void *)(element->data + element->datalen))
+
+#define for_each_element_id(element, _id, data, datalen)		\
+	for_each_element(element, data, datalen)			\
+		if (element->id == (_id))
+
+#define for_each_element_extid(element, extid, data, datalen)		\
+	for_each_element(element, data, datalen)			\
+		if (element->id == WLAN_EID_EXTENSION &&		\
+		    element->datalen > 0 &&				\
+		    element->data[0] == (extid))
+
+#define for_each_subelement(sub, element)				\
+	for_each_element(sub, (element)->data, (element)->datalen)
+
+#define for_each_subelement_id(sub, id, element)			\
+	for_each_element_id(sub, id, (element)->data, (element)->datalen)
+
+#define for_each_subelement_extid(sub, extid, element)			\
+	for_each_element_extid(sub, extid, (element)->data, (element)->datalen)
+
+/**
+ * for_each_element_completed - determine if element parsing consumed all data
+ * @element: element pointer after for_each_element() or friends
+ * @data: same data pointer as passed to for_each_element() or friends
+ * @datalen: same data length as passed to for_each_element() or friends
+ *
+ * This function returns %true if all the data was parsed or considered
+ * while walking the elements. Only use this if your for_each_element()
+ * loop cannot be broken out of, otherwise it always returns %false.
+ *
+ * If some data was malformed, this returns %false since the last parsed
+ * element will not fill the whole remaining data.
+ */
+static inline bool for_each_element_completed(const struct element *element,
+					      const void *data, size_t datalen)
+{
+	return (u8 *)element == (u8 *)data + datalen;
+}
+
 #endif /* __LINUX_IEEE80211_H */