cfg80211: Add an option to hint indoor operation

Add the option to hint the wireless core that it is operating in an indoor
environment.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

4 files changed, 68 insertions, 12 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index ac5b2d25f0fc..513bfd7b2e5f 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2602,10 +2602,13 @@ enum nl80211_dfs_regions {
  *      present has been registered with the wireless core that
  *      has listed NL80211_FEATURE_CELL_BASE_REG_HINTS as a
  *      supported feature.
+ * @NL80211_USER_REG_HINT_INDOOR: a user sent an hint indicating that the
+ *      platform is operating in an indoor environment.
  */
 enum nl80211_user_reg_hint_type {
         NL80211_USER_REG_HINT_USER      = 0,
         NL80211_USER_REG_HINT_CELL_BASE = 1,
+        NL80211_USER_REG_HINT_INDOOR    = 2,
 };
 
 /**
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b8d81e41b0f7..85bc830fd7e3 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4677,7 +4677,6 @@ static int parse_reg_rule(struct nlattr *tb[],
 
 static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
 {
-        int r;
         char *data = NULL;
         enum nl80211_user_reg_hint_type user_reg_hint_type;
 
@@ -4690,11 +4689,6 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
         if (unlikely(!rcu_access_pointer(cfg80211_regdomain)))
                 return -EINPROGRESS;
 
-        if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
-                return -EINVAL;
-
-        data = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);
-
         if (info->attrs[NL80211_ATTR_USER_REG_HINT_TYPE])
                 user_reg_hint_type =
                   nla_get_u32(info->attrs[NL80211_ATTR_USER_REG_HINT_TYPE]);
@@ -4704,14 +4698,16 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
         switch (user_reg_hint_type) {
         case NL80211_USER_REG_HINT_USER:
         case NL80211_USER_REG_HINT_CELL_BASE:
-                break;
+                if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
+                        return -EINVAL;
+
+                data = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);
+                return regulatory_hint_user(data, user_reg_hint_type);
+        case NL80211_USER_REG_HINT_INDOOR:
+                return regulatory_hint_indoor_user();
         default:
                 return -EINVAL;
         }
-
-        r = regulatory_hint_user(data, user_reg_hint_type);
-
-        return r;
 }
 
 static int nl80211_get_mesh_config(struct sk_buff *skb,
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 58f48b8f42ae..55d68c31ad72 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -65,11 +65,26 @@
 #define REG_DBG_PRINT(args...)
 #endif
 
+/**
+ * enum reg_request_treatment - regulatory request treatment
+ *
+ * @REG_REQ_OK: continue processing the regulatory request
+ * @REG_REQ_IGNORE: ignore the regulatory request
+ * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
+ *      be intersected with the current one.
+ * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
+ *      regulatory settings, and no further processing is required.
+ * @REG_REQ_USER_HINT_HANDLED: a non alpha2  user hint was handled and no
+ *      further processing is required, i.e., not need to update last_request
+ *      etc. This should be used for user hints that do not provide an alpha2
+ *      but some other type of regulatory hint, i.e., indoor operation.
+ */
 enum reg_request_treatment {
         REG_REQ_OK,
         REG_REQ_IGNORE,
         REG_REQ_INTERSECT,
         REG_REQ_ALREADY_SET,
+        REG_REQ_USER_HINT_HANDLED,
 };
 
 static struct regulatory_request core_request_world = {
@@ -106,6 +121,14 @@ const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
  */
 static int reg_num_devs_support_basehint;
 
+/*
+ * State variable indicating if the platform on which the devices
+ * are attached is operating in an indoor environment. The state variable
+ * is relevant for all registered devices.
+ * (protected by RTNL)
+ */
+static bool reg_is_indoor;
+
 static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
 {
         return rtnl_dereference(cfg80211_regdomain);
@@ -1128,6 +1151,13 @@ static bool reg_request_cell_base(struct regulatory_request *request)
         return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
 }
 
+static bool reg_request_indoor(struct regulatory_request *request)
+{
+        if (request->initiator != NL80211_REGDOM_SET_BY_USER)
+                return false;
+        return request->user_reg_hint_type == NL80211_USER_REG_HINT_INDOOR;
+}
+
 bool reg_last_request_cell_base(void)
 {
         return reg_request_cell_base(get_last_request());
@@ -1570,6 +1600,11 @@ __reg_process_hint_user(struct regulatory_request *user_request)
 {
         struct regulatory_request *lr = get_last_request();
 
+        if (reg_request_indoor(user_request)) {
+                reg_is_indoor = true;
+                return REG_REQ_USER_HINT_HANDLED;
+        }
+
         if (reg_request_cell_base(user_request))
                 return reg_ignore_cell_hint(user_request);
 
@@ -1617,7 +1652,8 @@ reg_process_hint_user(struct regulatory_request *user_request)
 
         treatment = __reg_process_hint_user(user_request);
         if (treatment == REG_REQ_IGNORE ||
-            treatment == REG_REQ_ALREADY_SET) {
+            treatment == REG_REQ_ALREADY_SET ||
+            treatment == REG_REQ_USER_HINT_HANDLED) {
                 kfree(user_request);
                 return treatment;
         }
@@ -1678,6 +1714,7 @@ reg_process_hint_driver(struct wiphy *wiphy,
         case REG_REQ_OK:
                 break;
         case REG_REQ_IGNORE:
+        case REG_REQ_USER_HINT_HANDLED:
                 kfree(driver_request);
                 return treatment;
         case REG_REQ_INTERSECT:
@@ -1777,6 +1814,7 @@ reg_process_hint_country_ie(struct wiphy *wiphy,
         case REG_REQ_OK:
                 break;
         case REG_REQ_IGNORE:
+        case REG_REQ_USER_HINT_HANDLED:
                 /* fall through */
         case REG_REQ_ALREADY_SET:
                 kfree(country_ie_request);
@@ -1969,6 +2007,22 @@ int regulatory_hint_user(const char *alpha2,
         return 0;
 }
 
+int regulatory_hint_indoor_user(void)
+{
+        struct regulatory_request *request;
+
+        request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
+        if (!request)
+                return -ENOMEM;
+
+        request->wiphy_idx = WIPHY_IDX_INVALID;
+        request->initiator = NL80211_REGDOM_SET_BY_USER;
+        request->user_reg_hint_type = NL80211_USER_REG_HINT_INDOOR;
+        queue_regulatory_request(request);
+
+        return 0;
+}
+
 /* Driver hints */
 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
 {
@@ -2136,6 +2190,8 @@ static void restore_regulatory_settings(bool reset_user)
 
         ASSERT_RTNL();
 
+        reg_is_indoor = false;
+
         reset_regdomains(true, &world_regdom);
         restore_alpha2(alpha2, reset_user);
 
diff --git a/net/wireless/reg.h b/net/wireless/reg.h
index 334a53af0fc8..2a3842828f6d 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -25,6 +25,7 @@ enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy);
 
 int regulatory_hint_user(const char *alpha2,
                          enum nl80211_user_reg_hint_type user_reg_hint_type);
+int regulatory_hint_indoor_user(void);
 
 void wiphy_regulatory_register(struct wiphy *wiphy);
 void wiphy_regulatory_deregister(struct wiphy *wiphy);