3 files changed, 16 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index b3b076a46d50..13b247d26544 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -961,6 +961,7 @@ struct station_info {
  * @MONITOR_FLAG_CONTROL: pass control frames
  * @MONITOR_FLAG_OTHER_BSS: disable BSSID filtering
  * @MONITOR_FLAG_COOK_FRAMES: report frames after processing
+ * @MONITOR_FLAG_ACTIVE: active monitor, ACKs frames on its MAC address
  */
 enum monitor_flags {
         MONITOR_FLAG_FCSFAIL            = 1<<NL80211_MNTR_FLAG_FCSFAIL,
@@ -968,6 +969,7 @@ enum monitor_flags {
         MONITOR_FLAG_CONTROL            = 1<<NL80211_MNTR_FLAG_CONTROL,
         MONITOR_FLAG_OTHER_BSS          = 1<<NL80211_MNTR_FLAG_OTHER_BSS,
         MONITOR_FLAG_COOK_FRAMES        = 1<<NL80211_MNTR_FLAG_COOK_FRAMES,
+        MONITOR_FLAG_ACTIVE             = 1<<NL80211_MNTR_FLAG_ACTIVE,
 };
 
 /**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 32b060ea5266..5920715278c2 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2428,6 +2428,8 @@ enum nl80211_survey_info {
  * @NL80211_MNTR_FLAG_OTHER_BSS: disable BSSID filtering
  * @NL80211_MNTR_FLAG_COOK_FRAMES: report frames after processing.
  *      overrides all other flags.
+ * @NL80211_MNTR_FLAG_ACTIVE: use the configured MAC address
+ *      and ACK incoming unicast packets.
  *
  * @__NL80211_MNTR_FLAG_AFTER_LAST: internal use
  * @NL80211_MNTR_FLAG_MAX: highest possible monitor flag
@@ -2439,6 +2441,7 @@ enum nl80211_mntr_flags {
         NL80211_MNTR_FLAG_CONTROL,
         NL80211_MNTR_FLAG_OTHER_BSS,
         NL80211_MNTR_FLAG_COOK_FRAMES,
+        NL80211_MNTR_FLAG_ACTIVE,
 
         /* keep last */
         __NL80211_MNTR_FLAG_AFTER_LAST,
@@ -3595,6 +3598,7 @@ enum nl80211_feature_flags {
         NL80211_FEATURE_ADVERTISE_CHAN_LIMITS           = 1 << 14,
         NL80211_FEATURE_FULL_AP_CLIENT_STATE            = 1 << 15,
         NL80211_FEATURE_USERSPACE_MPM                   = 1 << 16,
+        NL80211_FEATURE_ACTIVE_MONITOR                  = 1 << 17,
 };
 
 /**
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index fb6abcb359a1..31d265f36d2c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2227,6 +2227,7 @@ static const struct nla_policy mntr_flags_policy[NL80211_MNTR_FLAG_MAX + 1] = {
         [NL80211_MNTR_FLAG_CONTROL] = { .type = NLA_FLAG },
         [NL80211_MNTR_FLAG_OTHER_BSS] = { .type = NLA_FLAG },
         [NL80211_MNTR_FLAG_COOK_FRAMES] = { .type = NLA_FLAG },
+        [NL80211_MNTR_FLAG_ACTIVE] = { .type = NLA_FLAG },
 };
 
 static int parse_monitor_flags(struct nlattr *nla, u32 *mntrflags)
@@ -2338,6 +2339,10 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
                 change = true;
         }
 
+        if (flags && (*flags & NL80211_MNTR_FLAG_ACTIVE) &&
+            !(rdev->wiphy.features & NL80211_FEATURE_ACTIVE_MONITOR))
+                return -EOPNOTSUPP;
+
         if (change)
                 err = cfg80211_change_iface(rdev, dev, ntype, flags, &params);
         else
@@ -2395,6 +2400,11 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
         err = parse_monitor_flags(type == NL80211_IFTYPE_MONITOR ?
                                   info->attrs[NL80211_ATTR_MNTR_FLAGS] : NULL,
                                   &flags);
+
+        if (!err && (flags & NL80211_MNTR_FLAG_ACTIVE) &&
+            !(rdev->wiphy.features & NL80211_FEATURE_ACTIVE_MONITOR))
+                return -EOPNOTSUPP;
+
         wdev = rdev_add_virtual_intf(rdev,
                                 nla_data(info->attrs[NL80211_ATTR_IFNAME]),
                                 type, err ? NULL : &flags, &params);