cfg80211: add cellular base station regulatory hint support

Cellular base stations can provide hints to cfg80211 about
where they think we are. This can be done for example on
a cell phone. To enable these hints we simply allow them
through as user regulatory hints but we allow userspace
to clasify the hint as either coming directly from the
user or coming from a cellular base station. This option
is only available when you enable
CONFIG_CFG80211_CERTIFICATION_ONUS.

The base station hints themselves will not be processed
by the core unless at least one device on the system
supports this feature.

Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

4 files changed, 134 insertions, 8 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 71b684b5a675..c0307b05986c 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -542,6 +542,7 @@ int wiphy_register(struct wiphy *wiphy)
 	}
 
 	/* set up regulatory info */
+	wiphy_regulatory_register(wiphy);
 	regulatory_update(wiphy, NL80211_REGDOM_SET_BY_CORE);
 
 	list_add_rcu(&rdev->list, &cfg80211_rdev_list);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9216e45e53a0..50b1a0e84f1a 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -354,6 +354,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
 	[NL80211_ATTR_INACTIVITY_TIMEOUT] = { .type = NLA_U16 },
 	[NL80211_ATTR_BG_SCAN_PERIOD] = { .type = NLA_U16 },
 	[NL80211_ATTR_WDEV] = { .type = NLA_U64 },
+	[NL80211_ATTR_USER_REG_HINT_TYPE] = { .type = NLA_U32 },
 };
 
 /* policy for the key attributes */
@@ -3582,6 +3583,7 @@ 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;
 
 	/*
 	 * You should only get this when cfg80211 hasn't yet initialized
@@ -3601,7 +3603,21 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
 
 	data = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);
 
-	r = regulatory_hint_user(data);
+	if (info->attrs[NL80211_ATTR_USER_REG_HINT_TYPE])
+		user_reg_hint_type =
+		  nla_get_u32(info->attrs[NL80211_ATTR_USER_REG_HINT_TYPE]);
+	else
+		user_reg_hint_type = NL80211_USER_REG_HINT_USER;
+
+	switch (user_reg_hint_type) {
+	case NL80211_USER_REG_HINT_USER:
+	case NL80211_USER_REG_HINT_CELL_BASE:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	r = regulatory_hint_user(data, user_reg_hint_type);
 
 	return r;
 }
@@ -3971,6 +3987,11 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
 			cfg80211_regdomain->dfs_region)))
 		goto nla_put_failure;
 
+	if (reg_last_request_cell_base() &&
+	    nla_put_u32(msg, NL80211_ATTR_USER_REG_HINT_TYPE,
+			NL80211_USER_REG_HINT_CELL_BASE))
+		goto nla_put_failure;
+
 	nl_reg_rules = nla_nest_start(msg, NL80211_ATTR_REG_RULES);
 	if (!nl_reg_rules)
 		goto nla_put_failure;
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index ad6f9029c564..83583a9c15d9 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -97,9 +97,16 @@ const struct ieee80211_regdomain *cfg80211_regdomain;
  *     - cfg80211_world_regdom
  *     - cfg80211_regdom
  *     - last_request
+ *     - reg_num_devs_support_basehint
  */
 static DEFINE_MUTEX(reg_mutex);
 
+/*
+ * Number of devices that registered to the core
+ * that support cellular base station regulatory hints
+ */
+static int reg_num_devs_support_basehint;
+
 static inline void assert_reg_lock(void)
 {
 	lockdep_assert_held(&reg_mutex);
@@ -911,6 +918,59 @@ static void handle_band(struct wiphy *wiphy,
 		handle_channel(wiphy, initiator, band, i);
 }
 
+static bool reg_request_cell_base(struct regulatory_request *request)
+{
+	if (request->initiator != NL80211_REGDOM_SET_BY_USER)
+		return false;
+	if (request->user_reg_hint_type != NL80211_USER_REG_HINT_CELL_BASE)
+		return false;
+	return true;
+}
+
+bool reg_last_request_cell_base(void)
+{
+	assert_cfg80211_lock();
+
+	mutex_lock(&reg_mutex);
+	return reg_request_cell_base(last_request);
+	mutex_unlock(&reg_mutex);
+}
+
+#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
+
+/* Core specific check */
+static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
+{
+	if (!reg_num_devs_support_basehint)
+		return -EOPNOTSUPP;
+
+	if (reg_request_cell_base(last_request)) {
+		if (!regdom_changes(pending_request->alpha2))
+			return -EALREADY;
+		return 0;
+	}
+	return 0;
+}
+
+/* Device specific check */
+static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
+{
+	if (!(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS))
+		return true;
+	return false;
+}
+#else
+static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
+{
+	return -EOPNOTSUPP;
+}
+static int reg_dev_ignore_cell_hint(struct wiphy *wiphy)
+{
+	return true;
+}
+#endif
+
+
 static bool ignore_reg_update(struct wiphy *wiphy,
 			      enum nl80211_reg_initiator initiator)
 {
@@ -944,6 +1004,9 @@ static bool ignore_reg_update(struct wiphy *wiphy,
 		return true;
 	}
 
+	if (reg_request_cell_base(last_request))
+		return reg_dev_ignore_cell_hint(wiphy);
+
 	return false;
 }
 
@@ -1307,6 +1370,13 @@ static int ignore_request(struct wiphy *wiphy,
 		return 0;
 	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 
+		if (reg_request_cell_base(last_request)) {
+			/* Trust a Cell base station over the AP's country IE */
+			if (regdom_changes(pending_request->alpha2))
+				return -EOPNOTSUPP;
+			return -EALREADY;
+		}
+
 		last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
 
 		if (unlikely(!is_an_alpha2(pending_request->alpha2)))
@@ -1351,6 +1421,12 @@ static int ignore_request(struct wiphy *wiphy,
 
 		return REG_INTERSECT;
 	case NL80211_REGDOM_SET_BY_USER:
+		if (reg_request_cell_base(pending_request))
+			return reg_ignore_cell_hint(pending_request);
+
+		if (reg_request_cell_base(last_request))
+			return -EOPNOTSUPP;
+
 		if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
 			return REG_INTERSECT;
 		/*
@@ -1640,7 +1716,8 @@ static int regulatory_hint_core(const char *alpha2)
 }
 
 /* User hints */
-int regulatory_hint_user(const char *alpha2)
+int regulatory_hint_user(const char *alpha2,
+			 enum nl80211_user_reg_hint_type user_reg_hint_type)
 {
 	struct regulatory_request *request;
 
@@ -1654,6 +1731,7 @@ int regulatory_hint_user(const char *alpha2)
 	request->alpha2[0] = alpha2[0];
 	request->alpha2[1] = alpha2[1];
 	request->initiator = NL80211_REGDOM_SET_BY_USER;
+	request->user_reg_hint_type = user_reg_hint_type;
 
 	queue_regulatory_request(request);
 
@@ -1906,7 +1984,7 @@ static void restore_regulatory_settings(bool reset_user)
 	 * settings, user regulatory settings takes precedence.
 	 */
 	if (is_an_alpha2(alpha2))
-		regulatory_hint_user(user_alpha2);
+		regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
 
 	if (list_empty(&tmp_reg_req_list))
 		return;
@@ -2081,9 +2159,16 @@ static void print_regdomain(const struct ieee80211_regdomain *rd)
 	else {
 		if (is_unknown_alpha2(rd->alpha2))
 			pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
-		else
-			pr_info("Regulatory domain changed to country: %c%c\n",
-				rd->alpha2[0], rd->alpha2[1]);
+		else {
+			if (reg_request_cell_base(last_request))
+				pr_info("Regulatory domain changed "
+					"to country: %c%c by Cell Station\n",
+					rd->alpha2[0], rd->alpha2[1]);
+			else
+				pr_info("Regulatory domain changed "
+					"to country: %c%c\n",
+					rd->alpha2[0], rd->alpha2[1]);
+		}
 	}
 	print_dfs_region(rd->dfs_region);
 	print_rd_rules(rd);
@@ -2293,6 +2378,18 @@ int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 }
 #endif /* CONFIG_HOTPLUG */
 
+void wiphy_regulatory_register(struct wiphy *wiphy)
+{
+	assert_cfg80211_lock();
+
+	mutex_lock(&reg_mutex);
+
+	if (!reg_dev_ignore_cell_hint(wiphy))
+		reg_num_devs_support_basehint++;
+
+	mutex_unlock(&reg_mutex);
+}
+
 /* Caller must hold cfg80211_mutex */
 void reg_device_remove(struct wiphy *wiphy)
 {
@@ -2302,6 +2399,9 @@ void reg_device_remove(struct wiphy *wiphy)
 
 	mutex_lock(&reg_mutex);
 
+	if (!reg_dev_ignore_cell_hint(wiphy))
+		reg_num_devs_support_basehint--;
+
 	kfree(wiphy->regd);
 
 	if (last_request)
@@ -2367,7 +2467,8 @@ int __init regulatory_init(void)
 	 * as a user hint.
 	 */
 	if (!is_world_regdom(ieee80211_regdom))
-		regulatory_hint_user(ieee80211_regdom);
+		regulatory_hint_user(ieee80211_regdom,
+				     NL80211_USER_REG_HINT_USER);
 
 	return 0;
 }
diff --git a/net/wireless/reg.h b/net/wireless/reg.h
index e2aaaf525a22..519492fdda3c 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -22,9 +22,11 @@ bool is_world_regdom(const char *alpha2);
 bool reg_is_valid_request(const char *alpha2);
 bool reg_supported_dfs_region(u8 dfs_region);
 
-int regulatory_hint_user(const char *alpha2);
+int regulatory_hint_user(const char *alpha2,
+			 enum nl80211_user_reg_hint_type user_reg_hint_type);
 
 int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env);
+void wiphy_regulatory_register(struct wiphy *wiphy);
 void reg_device_remove(struct wiphy *wiphy);
 
 int __init regulatory_init(void);
@@ -33,6 +35,7 @@ void regulatory_exit(void);
 int set_regdom(const struct ieee80211_regdomain *rd);
 
 void regulatory_update(struct wiphy *wiphy, enum nl80211_reg_initiator setby);
+bool reg_last_request_cell_base(void);
 
 /**
  * regulatory_hint_found_beacon - hints a beacon was found on a channel