From 4347abcaf63d899fc8196523e7a4f1905645bff6 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jow@openwrt.org>
Date: Fri, 6 Jul 2012 01:00:14 +0000
Subject: [PATCH] iwinfo: find channel & frequency via nl80211 or hostapd
 instead of wext

SVN-Revision: 32630
---
 package/iwinfo/Makefile             |  2 +-
 package/iwinfo/src/iwinfo_nl80211.c | 71 ++++++++++++++++++++++++-----
 2 files changed, 60 insertions(+), 13 deletions(-)

diff --git a/package/iwinfo/Makefile b/package/iwinfo/Makefile
index 5fd04d3d15..aa85298c2c 100644
--- a/package/iwinfo/Makefile
+++ b/package/iwinfo/Makefile
@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libiwinfo
-PKG_RELEASE:=33
+PKG_RELEASE:=34
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 PKG_CONFIG_DEPENDS := \
diff --git a/package/iwinfo/src/iwinfo_nl80211.c b/package/iwinfo/src/iwinfo_nl80211.c
index 4205336f6a..7595ea838c 100644
--- a/package/iwinfo/src/iwinfo_nl80211.c
+++ b/package/iwinfo/src/iwinfo_nl80211.c
@@ -351,6 +351,17 @@ static int nl80211_freq2channel(int freq)
 	return (freq / 5) - 1000;
 }
 
+static int nl80211_channel2freq(int channel)
+{
+	if (channel == 14)
+		return 2484;
+
+	if (channel < 14)
+		return (channel * 5) + 2407;
+
+	return (1000 + channel) * 5;
+}
+
 static char * nl80211_getval(const char *ifname, const char *buf, const char *key)
 {
 	int i, len;
@@ -751,32 +762,68 @@ int nl80211_get_bssid(const char *ifname, char *buf)
 	return -1;
 }
 
+
+static int nl80211_get_channel_cb(struct nl_msg *msg, void *arg)
+{
+	int *channel = arg;
+	struct nlattr **attr = nl80211_parse(msg);
+	struct nlattr *binfo[NL80211_BSS_MAX + 1];
+
+	static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
+		[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
+	};
+
+	if (attr[NL80211_ATTR_BSS] &&
+	    !nla_parse_nested(binfo, NL80211_BSS_MAX,
+						  attr[NL80211_ATTR_BSS], bss_policy))
+	{
+		if (binfo[NL80211_BSS_FREQUENCY])
+			*channel =
+				nl80211_freq2channel(nla_get_u32(binfo[NL80211_BSS_FREQUENCY]));
+	}
+
+	return NL_SKIP;
+}
+
 int nl80211_get_channel(const char *ifname, int *buf)
 {
-	char *first;
+	char *res;
+	struct nl80211_msg_conveyor *req;
 
-	if (!wext_get_channel(ifname, buf))
-		return 0;
+	*buf = 0;
 
-	else if ((first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL)
-		return wext_get_channel(first, buf);
+	if ((res = nl80211_hostapd_info(ifname)) &&
+	    (res = nl80211_getval(NULL, res, "channel")))
+	{
+		*buf = atoi(res);
+	}
+	else
+	{
+		res = nl80211_phy2ifname(ifname);
+		req = nl80211_msg(res ? res : ifname, NL80211_CMD_GET_SCAN, NLM_F_DUMP);
 
-	return -1;
+		if (req)
+		{
+			nl80211_send(req, nl80211_get_channel_cb, buf);
+			nl80211_free(req);
+		}
+	}
+
+	return (*buf == 0) ? -1 : 0;
 }
 
 int nl80211_get_frequency(const char *ifname, int *buf)
 {
-	char *first;
-
-	if (!wext_get_frequency(ifname, buf))
+	if (!nl80211_get_channel(ifname, buf))
+	{
+		*buf = nl80211_channel2freq(*buf);
 		return 0;
-
-	else if ((first = nl80211_phy2ifname(nl80211_ifname2phy(ifname))) != NULL)
-		return wext_get_frequency(first, buf);
+	}
 
 	return -1;
 }
 
+
 int nl80211_get_txpower(const char *ifname, int *buf)
 {
 	return wext_get_txpower(ifname, buf);
-- 
2.25.1