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, 28 insertions, 9 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index bfc47b330687..46b4817cdea9 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1743,7 +1743,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
         }
 
         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
-                                        freq, beacon);
+                                        channel, beacon);
         if (!bss)
                 return;
 
@@ -2162,7 +2162,15 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
 
         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
-        ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
+
+        /* XXX maybe racy? */
+        if (sdata->local->scan_req)
+                return;
+
+        memcpy(sdata->local->int_scan_req.ssids[0].ssid,
+               ifsta->ssid, IEEE80211_MAX_SSID_LEN);
+        sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
+        ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
 }
 
 
@@ -2378,8 +2386,15 @@ dont_join:
                               IEEE80211_SCAN_INTERVAL)) {
                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
                        "join\n", sdata->dev->name);
-                return ieee80211_request_scan(sdata, ifsta->ssid,
-                                              ifsta->ssid_len);
+
+                /* XXX maybe racy? */
+                if (local->scan_req)
+                        return -EBUSY;
+
+                memcpy(local->int_scan_req.ssids[0].ssid,
+                       ifsta->ssid, IEEE80211_MAX_SSID_LEN);
+                local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
+                return ieee80211_request_scan(sdata, &local->int_scan_req);
         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
                 int interval = IEEE80211_SCAN_INTERVAL;
 
@@ -2478,11 +2493,16 @@ static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
         } else {
                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
                         ifsta->assoc_scan_tries++;
+                        /* XXX maybe racy? */
+                        if (local->scan_req)
+                                return -1;
+                        memcpy(local->int_scan_req.ssids[0].ssid,
+                               ifsta->ssid, IEEE80211_MAX_SSID_LEN);
                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
-                                ieee80211_start_scan(sdata, NULL, 0);
+                                local->int_scan_req.ssids[0].ssid_len = 0;
                         else
-                                ieee80211_start_scan(sdata, ifsta->ssid,
-                                                         ifsta->ssid_len);
+                                local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
+                        ieee80211_start_scan(sdata, &local->int_scan_req);
                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
                 } else {
@@ -2520,8 +2540,7 @@ static void ieee80211_sta_work(struct work_struct *work)
             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
-                ieee80211_start_scan(sdata, ifsta->scan_ssid,
-                                     ifsta->scan_ssid_len);
+                ieee80211_start_scan(sdata, local->scan_req);
                 return;
         }