cfg80211: process regulatory DFS region for countries

The wireless-regdb now has support for mapping a country to
one DFS region. CRDA sends this to us now so process it
so we can provide that hint to drivers. This will later be
used by code for processing DFS in a way that meets the
criteria for the DFS region the country belongs to.

Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 53 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 6bc7c4b32fa5..50482e129263 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -199,6 +199,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
 	[NL80211_ATTR_DONT_WAIT_FOR_ACK] = { .type = NLA_FLAG },
 	[NL80211_ATTR_PROBE_RESP] = { .type = NLA_BINARY,
 				      .len = IEEE80211_MAX_DATA_LEN },
+	[NL80211_ATTR_DFS_REGION] = { .type = NLA_U8 },
 };
 
 /* policy for the key attributes */
@@ -3382,6 +3383,9 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
 
 	NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2,
 		cfg80211_regdomain->alpha2);
+	if (cfg80211_regdomain->dfs_region)
+		NLA_PUT_U8(msg, NL80211_ATTR_DFS_REGION,
+			   cfg80211_regdomain->dfs_region);
 
 	nl_reg_rules = nla_nest_start(msg, NL80211_ATTR_REG_RULES);
 	if (!nl_reg_rules)
@@ -3440,6 +3444,7 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 	char *alpha2 = NULL;
 	int rem_reg_rules = 0, r = 0;
 	u32 num_rules = 0, rule_idx = 0, size_of_regd;
+	u8 dfs_region = 0;
 	struct ieee80211_regdomain *rd = NULL;
 
 	if (!info->attrs[NL80211_ATTR_REG_ALPHA2])
@@ -3450,6 +3455,9 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 
 	alpha2 = nla_data(info->attrs[NL80211_ATTR_REG_ALPHA2]);
 
+	if (info->attrs[NL80211_ATTR_DFS_REGION])
+		dfs_region = nla_get_u8(info->attrs[NL80211_ATTR_DFS_REGION]);
+
 	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
 			rem_reg_rules) {
 		num_rules++;
@@ -3477,6 +3485,13 @@ static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
 	rd->alpha2[0] = alpha2[0];
 	rd->alpha2[1] = alpha2[1];
 
+	/*
+	 * Disable DFS master mode if the DFS region was
+	 * not supported or known on this kernel.
+	 */
+	if (reg_supported_dfs_region(dfs_region))
+		rd->dfs_region = dfs_region;
+
 	nla_for_each_nested(nl_reg_rule, info->attrs[NL80211_ATTR_REG_RULES],
 			rem_reg_rules) {
 		nla_parse(tb, NL80211_REG_RULE_ATTR_MAX,
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 2520a1b7e7db..69141ed1f6df 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1946,6 +1946,42 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd)
 	}
 }
 
+bool reg_supported_dfs_region(u8 dfs_region)
+{
+	switch (dfs_region) {
+	case NL80211_DFS_UNSET:
+	case NL80211_DFS_FCC:
+	case NL80211_DFS_ETSI:
+	case NL80211_DFS_JP:
+		return true;
+	default:
+		REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
+			      dfs_region);
+		return false;
+	}
+}
+
+static void print_dfs_region(u8 dfs_region)
+{
+	if (!dfs_region)
+		return;
+
+	switch (dfs_region) {
+	case NL80211_DFS_FCC:
+		pr_info(" DFS Master region FCC");
+		break;
+	case NL80211_DFS_ETSI:
+		pr_info(" DFS Master region ETSI");
+		break;
+	case NL80211_DFS_JP:
+		pr_info(" DFS Master region JP");
+		break;
+	default:
+		pr_info(" DFS Master region Uknown");
+		break;
+	}
+}
+
 static void print_regdomain(const struct ieee80211_regdomain *rd)
 {
 
@@ -1973,6 +2009,7 @@ static void print_regdomain(const struct ieee80211_regdomain *rd)
 			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);
 }
 
diff --git a/net/wireless/reg.h b/net/wireless/reg.h
index 4a56799d868d..786e414afd91 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -5,6 +5,7 @@ extern const struct ieee80211_regdomain *cfg80211_regdomain;
 
 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);