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, 29 insertions, 3 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 956afea4214d..954edfbb6b6f 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -733,6 +733,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
                 return NULL;
 
         wiphy->privid = mac80211_wiphy_privid;
+        wiphy->max_scan_ssids = 4;
 
         local = wiphy_priv(wiphy);
         local->hw.wiphy = wiphy;
@@ -817,25 +818,33 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
         enum ieee80211_band band;
         struct net_device *mdev;
         struct ieee80211_master_priv *mpriv;
+        int channels, i, j;
 
         /*
          * generic code guarantees at least one band,
          * set this very early because much code assumes
          * that hw.conf.channel is assigned
          */
+        channels = 0;
         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
                 struct ieee80211_supported_band *sband;
 
                 sband = local->hw.wiphy->bands[band];
-                if (sband) {
+                if (sband && !local->oper_channel) {
                         /* init channel we're on */
                         local->hw.conf.channel =
                         local->oper_channel =
                         local->scan_channel = &sband->channels[0];
-                        break;
                 }
+                if (sband)
+                        channels += sband->n_channels;
         }
 
+        local->int_scan_req.n_channels = channels;
+        local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
+        if (!local->int_scan_req.channels)
+                return -ENOMEM;
+
         /* if low-level driver supports AP, we also support VLAN */
         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
@@ -845,7 +854,7 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 
         result = wiphy_register(local->hw.wiphy);
         if (result < 0)
-                return result;
+                goto fail_wiphy_register;
 
         /*
          * We use the number of queues for feature tests (QoS, HT) internally
@@ -948,6 +957,20 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 
         ieee80211_led_init(local);
 
+        /* alloc internal scan request */
+        i = 0;
+        local->int_scan_req.ssids = &local->scan_ssid;
+        local->int_scan_req.n_ssids = 1;
+        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+                if (!hw->wiphy->bands[band])
+                        continue;
+                for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
+                        local->int_scan_req.channels[i] =
+                                &hw->wiphy->bands[band]->channels[j];
+                        i++;
+                }
+        }
+
         return 0;
 
 fail_wep:
@@ -966,6 +989,8 @@ fail_workqueue:
                 free_netdev(local->mdev);
 fail_mdev_alloc:
         wiphy_unregister(local->hw.wiphy);
+fail_wiphy_register:
+        kfree(local->int_scan_req.channels);
         return result;
 }
 EXPORT_SYMBOL(ieee80211_register_hw);
@@ -1011,6 +1036,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
         ieee80211_wep_free(local);
         ieee80211_led_exit(local);
         free_netdev(local->mdev);
+        kfree(local->int_scan_req.channels);
 }
 EXPORT_SYMBOL(ieee80211_unregister_hw);