wifi: cfg80211: expose cfg80211_iter_rnr() to drivers

In mac80211 we'll need to look at reduced neighbor report
entries for channel switch purposes, so export the iteration
function to make that simpler.
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240228095718.0954809964ef.I53e95c017aa71f14e8d1057afbbc75982ddb43df@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -6870,6 +6870,38 @@ cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
 	return (const void *)cfg80211_find_vendor_elem(oui, oui_type, ies, len);
 }
 
+/**
+ * enum cfg80211_rnr_iter_ret - reduced neighbor report iteration state
+ * @RNR_ITER_CONTINUE: continue iterating with the next entry
+ * @RNR_ITER_BREAK: break iteration and return success
+ * @RNR_ITER_ERROR: break iteration and return error
+ */
+enum cfg80211_rnr_iter_ret {
+	RNR_ITER_CONTINUE,
+	RNR_ITER_BREAK,
+	RNR_ITER_ERROR,
+};
+
+/**
+ * cfg80211_iter_rnr - iterate reduced neighbor report entries
+ * @elems: the frame elements to iterate RNR elements and then
+ *	their entries in
+ * @elems_len: length of the elements
+ * @iter: iteration function, see also &enum cfg80211_rnr_iter_ret
+ *	for the return value
+ * @iter_data: additional data passed to the iteration function
+ * Return: %true on success (after successfully iterating all entries
+ *	or if the iteration function returned %RNR_ITER_BREAK),
+ *	%false on error (iteration function returned %RNR_ITER_ERROR
+ *	or elements were malformed.)
+ */
+bool cfg80211_iter_rnr(const u8 *elems, size_t elems_len,
+		       enum cfg80211_rnr_iter_ret
+		       (*iter)(void *data, u8 type,
+			       const struct ieee80211_neighbor_ap_info *info,
+			       const u8 *tbtt_info, u8 tbtt_info_len),
+		       void *iter_data);
+
 /**
  * cfg80211_defragment_element - Defrag the given element data into a buffer
  *

net/wireless/scan.c

@@ -611,19 +611,12 @@ static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
 	return 0;
 }
 
-enum cfg80211_rnr_iter_ret {
-	RNR_ITER_CONTINUE,
-	RNR_ITER_BREAK,
-	RNR_ITER_ERROR,
-};
-
-static bool
-cfg80211_iter_rnr(const u8 *elems, size_t elems_len,
-		  enum cfg80211_rnr_iter_ret
-		  (*iter)(void *data, u8 type,
-			  const struct ieee80211_neighbor_ap_info *info,
-			  const u8 *tbtt_info, u8 tbtt_info_len),
-		  void *iter_data)
+bool cfg80211_iter_rnr(const u8 *elems, size_t elems_len,
+		       enum cfg80211_rnr_iter_ret
+		       (*iter)(void *data, u8 type,
+			       const struct ieee80211_neighbor_ap_info *info,
+			       const u8 *tbtt_info, u8 tbtt_info_len),
+		       void *iter_data)
 {
 	const struct element *rnr;
 	const u8 *pos, *end;
@@ -675,6 +668,7 @@ cfg80211_iter_rnr(const u8 *elems, size_t elems_len,
 
 	return true;
 }
+EXPORT_SYMBOL_GPL(cfg80211_iter_rnr);
 
 struct colocated_ap_data {
 	const struct element *ssid_elem;