nl80211: Use max tx power from regulatory domain

Previously the Country element contained the max TX power the local
hardware was capable of. Change this to just use the regulatory limit.

Signed-hostap: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>

src/drivers/driver.h

@@ -57,7 +57,7 @@ struct hostapd_channel_data {
 	int flag;
 
 	/**
-	 * max_tx_power - Maximum transmit power in dBm
+	 * max_tx_power - Regulatory transmit power limit in dBm
 	 */
 	u8 max_tx_power;
 

src/drivers/driver_nl80211.c

@@ -5645,10 +5645,6 @@ static void phy_info_freq(struct hostapd_hw_modes *mode,
 	if (tb_freq[NL80211_FREQUENCY_ATTR_RADAR])
 		chan->flag |= HOSTAPD_CHAN_RADAR;
 
-	if (tb_freq[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] &&
-	    !tb_freq[NL80211_FREQUENCY_ATTR_DISABLED])
-		chan->max_tx_power = nla_get_u32(
-			tb_freq[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]) / 100;
 	if (tb_freq[NL80211_FREQUENCY_ATTR_DFS_STATE]) {
 		enum nl80211_dfs_state state =
 			nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_DFS_STATE]);
@@ -5971,6 +5967,38 @@ static void nl80211_set_ht40_mode_sec(struct hostapd_hw_modes *mode, int start,
 }
 
 
+static void nl80211_reg_rule_max_eirp(struct nlattr *tb[],
+				      struct phy_info_arg *results)
+{
+	u32 start, end, max_eirp;
+	u16 m;
+
+	if (tb[NL80211_ATTR_FREQ_RANGE_START] == NULL ||
+	    tb[NL80211_ATTR_FREQ_RANGE_END] == NULL ||
+	    tb[NL80211_ATTR_POWER_RULE_MAX_EIRP] == NULL)
+		return;
+
+	start = nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_START]) / 1000;
+	end = nla_get_u32(tb[NL80211_ATTR_FREQ_RANGE_END]) / 1000;
+	max_eirp = nla_get_u32(tb[NL80211_ATTR_POWER_RULE_MAX_EIRP]) / 100;
+
+	wpa_printf(MSG_DEBUG, "nl80211: %u-%u @ %u mBm",
+		   start, end, max_eirp);
+
+	for (m = 0; m < *results->num_modes; m++) {
+		int c;
+		struct hostapd_hw_modes *mode = &results->modes[m];
+
+		for (c = 0; c < mode->num_channels; c++) {
+			struct hostapd_channel_data *chan = &mode->channels[c];
+			if ((u32) chan->freq - 10 >= start &&
+			    (u32) chan->freq + 10 <= end)
+				chan->max_tx_power = max_eirp;
+		}
+	}
+}
+
+
 static void nl80211_reg_rule_ht40(struct nlattr *tb[],
 				  struct phy_info_arg *results)
 {
@@ -6061,6 +6089,7 @@ static int nl80211_get_reg(struct nl_msg *msg, void *arg)
 		nla_parse(tb_rule, NL80211_FREQUENCY_ATTR_MAX,
 			  nla_data(nl_rule), nla_len(nl_rule), reg_policy);
 		nl80211_reg_rule_ht40(tb_rule, results);
+		nl80211_reg_rule_max_eirp(tb_rule, results);
 	}
 
 	nla_for_each_nested(nl_rule, tb_msg[NL80211_ATTR_REG_RULES], rem_rule)