cfg80211: Add support for QoS mapping

This allows QoS mapping from external networks to be implemented as
defined in IEEE Std 802.11-2012, 10.24.9. APs can use this to advertise
DSCP ranges and exceptions for mapping frames to a specific UP over
Wi-Fi.

The payload of the QoS Map Set element (IEEE Std 802.11-2012, 8.4.2.97)
is sent to the driver through the new NL80211_ATTR_QOS_MAP attribute to
configure the local behavior either on the AP (based on local
configuration) or on a station (based on information received from the
AP).

Signed-off-by: Kyeyoon Park <kyeyoonp@qca.qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 52 insertions, 1 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 6d238a4331bd..56c597793d6d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1972,6 +1972,50 @@ struct cfg80211_mgmt_tx_params {
 };
 
 /**
+ * struct cfg80211_dscp_exception - DSCP exception
+ *
+ * @dscp: DSCP value that does not adhere to the user priority range definition
+ * @up: user priority value to which the corresponding DSCP value belongs
+ */
+struct cfg80211_dscp_exception {
+        u8 dscp;
+        u8 up;
+};
+
+/**
+ * struct cfg80211_dscp_range - DSCP range definition for user priority
+ *
+ * @low: lowest DSCP value of this user priority range, inclusive
+ * @high: highest DSCP value of this user priority range, inclusive
+ */
+struct cfg80211_dscp_range {
+        u8 low;
+        u8 high;
+};
+
+/* QoS Map Set element length defined in IEEE Std 802.11-2012, 8.4.2.97 */
+#define IEEE80211_QOS_MAP_MAX_EX        21
+#define IEEE80211_QOS_MAP_LEN_MIN       16
+#define IEEE80211_QOS_MAP_LEN_MAX \
+        (IEEE80211_QOS_MAP_LEN_MIN + 2 * IEEE80211_QOS_MAP_MAX_EX)
+
+/**
+ * struct cfg80211_qos_map - QoS Map Information
+ *
+ * This struct defines the Interworking QoS map setting for DSCP values
+ *
+ * @num_des: number of DSCP exceptions (0..21)
+ * @dscp_exception: optionally up to maximum of 21 DSCP exceptions from
+ *      the user priority DSCP range definition
+ * @up: DSCP range definition for a particular user priority
+ */
+struct cfg80211_qos_map {
+        u8 num_des;
+        struct cfg80211_dscp_exception dscp_exception[IEEE80211_QOS_MAP_MAX_EX];
+        struct cfg80211_dscp_range up[8];
+};
+
+/**
  * struct cfg80211_ops - backend description for wireless configuration
  *
  * This struct is registered by fullmac card drivers and/or wireless stacks
@@ -2213,6 +2257,8 @@ struct cfg80211_mgmt_tx_params {
  * @set_coalesce: Set coalesce parameters.
  *
  * @channel_switch: initiate channel-switch procedure (with CSA)
+ *
+ * @set_qos_map: Set QoS mapping information to the driver
  */
 struct cfg80211_ops {
         int     (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -2454,6 +2500,9 @@ struct cfg80211_ops {
         int     (*channel_switch)(struct wiphy *wiphy,
                                   struct net_device *dev,
                                   struct cfg80211_csa_settings *params);
+        int     (*set_qos_map)(struct wiphy *wiphy,
+                               struct net_device *dev,
+                               struct cfg80211_qos_map *qos_map);
 };
 
 /*
@@ -3432,9 +3481,11 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 /**
  * cfg80211_classify8021d - determine the 802.1p/1d tag for a data frame
  * @skb: the data frame
+ * @qos_map: Interworking QoS mapping or %NULL if not in use
  * Return: The 802.1p/1d tag.
  */
-unsigned int cfg80211_classify8021d(struct sk_buff *skb);
+unsigned int cfg80211_classify8021d(struct sk_buff *skb,
+                                    struct cfg80211_qos_map *qos_map);
 
 /**
  * cfg80211_find_ie - find information element in data