cfg80211/nl80211: scanning (and mac80211 update to use it)

This patch adds basic scan capability to cfg80211/nl80211 and
changes mac80211 to use it. The BSS list that cfg80211 maintains
is made driver-accessible with a private area in each BSS struct,
but mac80211 doesn't yet use it. That's another large project.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/net/wireless/core.h b/net/wireless/core.h
index f7fb9f413028..e29ad4cd464f 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -8,6 +8,8 @@
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/netdevice.h>
+#include <linux/kref.h>
+#include <linux/rbtree.h>
 #include <net/genetlink.h>
 #include <net/wireless.h>
 #include <net/cfg80211.h>
@@ -41,6 +43,13 @@ struct cfg80211_registered_device {
         struct mutex devlist_mtx;
         struct list_head netdev_list;
 
+        /* BSSes/scanning */
+        spinlock_t bss_lock;
+        struct list_head bss_list;
+        struct rb_root bss_tree;
+        u32 bss_generation;
+        struct cfg80211_scan_request *scan_req; /* protected by RTNL */
+
         /* must be last because of the way we do wiphy_priv(),
          * and it should at least be aligned to NETDEV_ALIGN */
         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
@@ -56,6 +65,15 @@ struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
 extern struct mutex cfg80211_drv_mutex;
 extern struct list_head cfg80211_drv_list;
 
+struct cfg80211_internal_bss {
+        struct list_head list;
+        struct rb_node rbn;
+        unsigned long ts;
+        struct kref ref;
+        /* must be last because of priv member */
+        struct cfg80211_bss pub;
+};
+
 /*
  * This function returns a pointer to the driver
  * that the genl_info item that is passed refers to.
@@ -94,4 +112,6 @@ extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
 void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby);
 
+void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
+
 #endif /* __NET_WIRELESS_CORE_H */