cfg80211: add more flexible BSS lookup
Johannes Berg [Tue, 10 Feb 2009 20:25:59 +0000 (21:25 +0100)]
Add a more flexible BSS lookup function so that mac80211 or
other drivers can actually use this for getting the BSS to
connect to.

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

include/net/cfg80211.h
net/wireless/scan.c

index f1d2157..c0d1f5b 100644 (file)
@@ -785,7 +785,17 @@ cfg80211_inform_bss_frame(struct wiphy *wiphy,
 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
                                      struct ieee80211_channel *channel,
                                      const u8 *bssid,
-                                     const u8 *ssid, size_t ssid_len);
+                                     const u8 *ssid, size_t ssid_len,
+                                     u16 capa_mask, u16 capa_val);
+static inline struct cfg80211_bss *
+cfg80211_get_ibss(struct wiphy *wiphy,
+                 struct ieee80211_channel *channel,
+                 const u8 *ssid, size_t ssid_len)
+{
+       return cfg80211_get_bss(wiphy, channel, NULL, ssid, ssid_len,
+                               WLAN_CAPABILITY_IBSS, WLAN_CAPABILITY_IBSS);
+}
+
 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
                                       struct ieee80211_channel *channel,
                                       const u8 *meshid, size_t meshidlen,
index aacccc9..b1893c8 100644 (file)
@@ -116,9 +116,12 @@ static bool is_bss(struct cfg80211_bss *a,
 {
        const u8 *ssidie;
 
-       if (compare_ether_addr(a->bssid, bssid))
+       if (bssid && compare_ether_addr(a->bssid, bssid))
                return false;
 
+       if (!ssid)
+               return true;
+
        ssidie = find_ie(WLAN_EID_SSID,
                         a->information_elements,
                         a->len_information_elements);
@@ -199,7 +202,8 @@ static int cmp_bss(struct cfg80211_bss *a,
 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
                                      struct ieee80211_channel *channel,
                                      const u8 *bssid,
-                                     const u8 *ssid, size_t ssid_len)
+                                     const u8 *ssid, size_t ssid_len,
+                                     u16 capa_mask, u16 capa_val)
 {
        struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
        struct cfg80211_internal_bss *bss, *res = NULL;
@@ -207,6 +211,8 @@ struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
        spin_lock_bh(&dev->bss_lock);
 
        list_for_each_entry(bss, &dev->bss_list, list) {
+               if ((bss->pub.capability & capa_mask) != capa_val)
+                       continue;
                if (channel && bss->pub.channel != channel)
                        continue;
                if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {