--- zzzz-none-000/linux-4.1.52/include/linux/ieee80211.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/linux/ieee80211.h	2022-03-02 11:37:13.000000000 +0000
@@ -2545,4 +2545,58 @@
 	return true;
 }
 
+#ifdef CONFIG_BCM_KF_CFG80211_BACKPORT
+struct element {
+	u8 id;
+	u8 datalen;
+	u8 data[];
+} __packed;
+
+/* element iteration helpers */
+#define for_each_element(_elem, _data, _datalen)			\
+	for (_elem = (const struct element *)(_data);			\
+	     (const u8 *)(_data) + (_datalen) - (const u8 *)_elem >=	\
+		(int)sizeof(*_elem) &&					\
+	     (const u8 *)(_data) + (_datalen) - (const u8 *)_elem >=	\
+		(int)sizeof(*_elem) + _elem->datalen;			\
+	     _elem = (const struct element *)(_elem->data + _elem->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 (const u8 *)element == (const u8 *)data + datalen;
+}
+#endif /* CONFIG_BCM_KF_CFG80211_BACKPORT */
 #endif /* LINUX_IEEE80211_H */