cfg80211: assimilate and export ieee80211_bss_get_ie

This function from mac80211 seems generally useful, and
I will need it in cfg80211 soon.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 33 insertions, 22 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index fe87819954a5..eb026541f928 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -605,6 +605,15 @@ struct cfg80211_bss {
 };
 
 /**
+ * ieee80211_bss_get_ie - find IE with given ID
+ * @bss: the bss to search
+ * @ie: the IE ID
+ * Returns %NULL if not found.
+ */
+const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie);
+
+
+/**
  * struct cfg80211_crypto_settings - Crypto settings
  * @wpa_versions: indicates which, if any, WPA versions are enabled
  *      (from enum nl80211_wpa_versions)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 2d9b6663253c..5748cda659c2 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -46,26 +46,6 @@ static int ecw2cw(int ecw)
         return (1 << ecw) - 1;
 }
 
-static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
-{
-        u8 *end, *pos;
-
-        pos = bss->cbss.information_elements;
-        if (pos == NULL)
-                return NULL;
-        end = pos + bss->cbss.len_information_elements;
-
-        while (pos + 1 < end) {
-                if (pos + 2 + pos[1] > end)
-                        break;
-                if (pos[0] == ie)
-                        return pos;
-                pos += 2 + pos[1];
-        }
-
-        return NULL;
-}
-
 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
                                       struct ieee80211_supported_band *sband,
                                       u32 *rates)
@@ -181,7 +161,8 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
         struct ieee80211_local *local = sdata->local;
         struct sk_buff *skb;
         struct ieee80211_mgmt *mgmt;
-        u8 *pos, *ies, *ht_ie;
+        u8 *pos;
+        const u8 *ies, *ht_ie;
         int i, len, count, rates_len, supp_rates_len;
         u16 capab;
         struct ieee80211_bss *bss;
@@ -345,7 +326,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
          */
         if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
             sband->ht_cap.ht_supported &&
-            (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
+            (ht_ie = ieee80211_bss_get_ie(&bss->cbss, WLAN_EID_HT_INFORMATION)) &&
             ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
             (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))) {
                 struct ieee80211_ht_info *ht_info =
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 25550692dda6..28f8f96801d4 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -502,3 +502,24 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb)
         return dscp >> 5;
 }
 EXPORT_SYMBOL(cfg80211_classify8021d);
+
+const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
+{
+        u8 *end, *pos;
+
+        pos = bss->information_elements;
+        if (pos == NULL)
+                return NULL;
+        end = pos + bss->len_information_elements;
+
+        while (pos + 1 < end) {
+                if (pos + 2 + pos[1] > end)
+                        break;
+                if (pos[0] == ie)
+                        return pos;
+                pos += 2 + pos[1];
+        }
+
+        return NULL;
+}
+EXPORT_SYMBOL(ieee80211_bss_get_ie);