nl80211: Add frequency configuration (including HT40)

Index: wireless-testing/include/linux/nl80211.h
===================================================================
@@ -26,8 +26,9 @@
  * @NL80211_CMD_GET_WIPHY: request information about a wiphy or dump request
  *	to get a list of all present wiphys.
  * @NL80211_CMD_SET_WIPHY: set wiphy parameters, needs %NL80211_ATTR_WIPHY or
- *	%NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME
- *	and/or %NL80211_ATTR_WIPHY_TXQ_PARAMS.
+ *	%NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME,
+ *	%NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ, and/or
+ *	%NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET.
  * @NL80211_CMD_NEW_WIPHY: Newly created wiphy, response to get request
  *	or rename notification. Has attributes %NL80211_ATTR_WIPHY and
  *	%NL80211_ATTR_WIPHY_NAME.

@@ -180,6 +181,14 @@
  *	/sys/class/ieee80211/<phyname>/index
  * @NL80211_ATTR_WIPHY_NAME: wiphy name (used for renaming)
  * @NL80211_ATTR_WIPHY_TXQ_PARAMS: a nested array of TX queue parameters
+ * @NL80211_ATTR_WIPHY_FREQ: frequency of the selected channel in MHz
+ * @NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET: included with NL80211_ATTR_WIPHY_FREQ
+ *	if HT20 or HT40 are allowed (i.e., 802.11n disabled if not included):
+ *	NL80211_SEC_CHAN_NO_HT = HT not allowed (i.e., same as not including
+ *		this attribute)
+ *	NL80211_SEC_CHAN_DISABLED = HT20 only
+ *	NL80211_SEC_CHAN_BELOW = secondary channel is below the primary channel
+ *	NL80211_SEC_CHAN_ABOVE = secondary channel is above the primary channel
  *
  * @NL80211_ATTR_IFINDEX: network interface index of the device to operate on
  * @NL80211_ATTR_IFNAME: network interface name

@@ -315,6 +324,8 @@
 	NL80211_ATTR_BSS_BASIC_RATES,
 
 	NL80211_ATTR_WIPHY_TXQ_PARAMS,
+	NL80211_ATTR_WIPHY_FREQ,
+	NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET,
 
 	/* add attributes here, update the policy in nl80211.c */
 

@@ -329,6 +340,8 @@
 #define NL80211_ATTR_HT_CAPABILITY NL80211_ATTR_HT_CAPABILITY
 #define NL80211_ATTR_BSS_BASIC_RATES NL80211_ATTR_BSS_BASIC_RATES
 #define NL80211_ATTR_WIPHY_TXQ_PARAMS NL80211_ATTR_WIPHY_TXQ_PARAMS
+#define NL80211_ATTR_WIPHY_FREQ NL80211_ATTR_WIPHY_FREQ
+#define NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET
 
 #define NL80211_MAX_SUPP_RATES			32
 #define NL80211_MAX_SUPP_REG_RULES		32

@@ -742,4 +755,10 @@
 	NL80211_TXQ_Q_BK
 };
 
+enum nl80211_sec_chan_offset {
+	NL80211_SEC_CHAN_NO_HT /* No HT */,
+	NL80211_SEC_CHAN_DISABLED /* HT20 only */,
+	NL80211_SEC_CHAN_BELOW /* HT40- */,
+	NL80211_SEC_CHAN_ABOVE /* HT40+ */
+};
 #endif /* __LINUX_NL80211_H */

Index: wireless-testing/include/net/cfg80211.h
===================================================================
@@ -392,6 +392,9 @@
 /* from net/wireless.h */
 struct wiphy;
 
+/* from net/ieee80211.h */
+struct ieee80211_channel;
+
 /**
  * struct cfg80211_ops - backend description for wireless configuration
  *

@@ -450,6 +453,8 @@
  * @change_bss: Modify parameters for a given BSS.
  *
  * @set_txq_params: Set TX queue parameters
+ *
+ * @set_channel: Set channel
  */
 struct cfg80211_ops {
 	int	(*add_virtual_intf)(struct wiphy *wiphy, char *name,

@@ -513,6 +518,10 @@
 
 	int	(*set_txq_params)(struct wiphy *wiphy,
 				  struct ieee80211_txq_params *params);
+
+	int	(*set_channel)(struct wiphy *wiphy,
+			       struct ieee80211_channel *chan,
+			       enum nl80211_sec_chan_offset);
 };
 
 #endif /* __NET_CFG80211_H */

Index: wireless-testing/net/mac80211/cfg.c
===================================================================
@@ -1095,6 +1095,18 @@
 	return 0;
 }
 
+static int ieee80211_set_channel(struct wiphy *wiphy,
+				 struct ieee80211_channel *chan,
+				 enum nl80211_sec_chan_offset sec_chan_offset)
+{
+	struct ieee80211_local *local = wiphy_priv(wiphy);
+
+	local->oper_channel = chan;
+	local->oper_sec_chan_offset = sec_chan_offset;
+
+	return ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+}
+
 struct cfg80211_ops mac80211_config_ops = {
 	.add_virtual_intf = ieee80211_add_iface,
 	.del_virtual_intf = ieee80211_del_iface,

@@ -1122,4 +1134,5 @@
 #endif
 	.change_bss = ieee80211_change_bss,
 	.set_txq_params = ieee80211_set_txq_params,
+	.set_channel = ieee80211_set_channel,
 };

69 lines not on this page · raw message

Index: wireless-testing/include/net/mac80211.h
===================================================================
@@ -507,6 +507,9 @@
 
 struct ieee80211_ht_conf {
 	bool enabled;
+	int sec_chan_offset; /* 0 = HT40 disabled; -1 = HT40 enabled, secondary
+			      * channel below primary; 1 = HT40 enabled,
+			      * secondary channel above primary */
 };
 
 /**

Index: wireless-testing/net/mac80211/util.c
===================================================================
@@ -641,6 +641,7 @@
 		    chan->flags & IEEE80211_CHAN_NO_IBSS)
 			return ret;
 		local->oper_channel = chan;
+		local->oper_sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
 
 		if (local->sw_scanning || local->hw_scanning)
 			ret = 0;

Index: wireless-testing/net/mac80211/ieee80211_i.h
===================================================================
@@ -626,6 +626,7 @@
 	struct delayed_work scan_work;
 	struct ieee80211_sub_if_data *scan_sdata;
 	struct ieee80211_channel *oper_channel, *scan_channel;
+	enum nl80211_sec_chan_offset oper_sec_chan_offset;
 	u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
 	size_t scan_ssid_len;
 	struct list_head bss_list;

Index: wireless-testing/net/mac80211/main.c
===================================================================
@@ -195,20 +195,42 @@
 	struct ieee80211_channel *chan;
 	int ret = 0;
 	int power;
+	enum nl80211_sec_chan_offset sec_chan_offset;
 
 	might_sleep();
 
-	if (local->sw_scanning)
+	if (local->sw_scanning) {
 		chan = local->scan_channel;
-	else
+		sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
+	} else {
 		chan = local->oper_channel;
+		sec_chan_offset = local->oper_sec_chan_offset;
+	}
 
-	if (chan != local->hw.conf.channel) {
+	if (chan != local->hw.conf.channel ||
+	    sec_chan_offset != local->hw.conf.ht.sec_chan_offset) {
 		local->hw.conf.channel = chan;
+		switch (sec_chan_offset) {
+		case NL80211_SEC_CHAN_NO_HT:
+			local->hw.conf.ht.enabled = false;
+			local->hw.conf.ht.sec_chan_offset = 0;
+			break;
+		case NL80211_SEC_CHAN_DISABLED:
+			local->hw.conf.ht.enabled = true;
+			local->hw.conf.ht.sec_chan_offset = 0;
+			break;
+		case NL80211_SEC_CHAN_BELOW:
+			local->hw.conf.ht.enabled = true;
+			local->hw.conf.ht.sec_chan_offset = -1;
+			break;
+		case NL80211_SEC_CHAN_ABOVE:
+			local->hw.conf.ht.enabled = true;
+			local->hw.conf.ht.sec_chan_offset = 1;
+			break;
+		}
 		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 	}
 
-
 	if (!local->hw.conf.power_level)
 		power = chan->max_power;
 	else