mac80211_hwsim: support scanning with random MAC address

This adds support for scanning with random MAC address for
both software and hardware scan.

Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 6daaad5..c2303db 100644 (file)
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -422,6 +422,7 @@ struct mac80211_hwsim_data {
        struct cfg80211_scan_request *hw_scan_request;
        struct ieee80211_vif *hw_scan_vif;
        int scan_chan_idx;
+       u8 scan_addr[ETH_ALEN];
 
        struct ieee80211_channel *channel;
        u64 beacon_int  /* beacon interval in us */;
@@ -830,6 +831,9 @@ static bool mac80211_hwsim_addr_match(struct mac80211_hwsim_data *data,
                .ret = false,
        };
 
+       if (data->scanning && memcmp(addr, data->scan_addr, ETH_ALEN) == 0)
+               return true;
+
        memcpy(md.addr, addr, ETH_ALEN);
 
        ieee80211_iterate_active_interfaces_atomic(data->hw,
@@ -1802,7 +1806,7 @@ static void hw_scan_work(struct work_struct *work)
                        struct sk_buff *probe;
 
                        probe = ieee80211_probereq_get(hwsim->hw,
-                                                      hwsim->hw_scan_vif->addr,
+                                                      hwsim->scan_addr,
                                                       req->ssids[i].ssid,
                                                       req->ssids[i].ssid_len,
                                                       req->ie_len);
@@ -1840,6 +1844,12 @@ static int mac80211_hwsim_hw_scan(struct ieee80211_hw *hw,
        hwsim->hw_scan_request = req;
        hwsim->hw_scan_vif = vif;
        hwsim->scan_chan_idx = 0;
+       if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
+               get_random_mask_addr(hwsim->scan_addr,
+                                    hw_req->req.mac_addr,
+                                    hw_req->req.mac_addr_mask);
+       else
+               memcpy(hwsim->scan_addr, vif->addr, ETH_ALEN);
        mutex_unlock(&hwsim->mutex);
 
        wiphy_debug(hw->wiphy, "hwsim hw_scan request\n");
@@ -1880,6 +1890,8 @@ static void mac80211_hwsim_sw_scan(struct ieee80211_hw *hw,
        }
 
        printk(KERN_DEBUG "hwsim sw_scan request, prepping stuff\n");
+
+       memcpy(hwsim->scan_addr, mac_addr, ETH_ALEN);
        hwsim->scanning = true;
 
 out:
@@ -1895,6 +1907,7 @@ static void mac80211_hwsim_sw_scan_complete(struct ieee80211_hw *hw,
 
        printk(KERN_DEBUG "hwsim sw_scan_complete\n");
        hwsim->scanning = false;
+       memset(hwsim->scan_addr, 0, ETH_ALEN);
 
        mutex_unlock(&hwsim->mutex);
 }
@@ -2320,7 +2333,8 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
        hw->wiphy->features |= NL80211_FEATURE_ACTIVE_MONITOR |
                               NL80211_FEATURE_AP_MODE_CHAN_WIDTH_CHANGE |
                               NL80211_FEATURE_STATIC_SMPS |
-                              NL80211_FEATURE_DYNAMIC_SMPS;
+                              NL80211_FEATURE_DYNAMIC_SMPS |
+                              NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR;
 
        /* ask mac80211 to reserve space for magic */
        hw->vif_data_size = sizeof(struct hwsim_vif_priv);