nl80211: Parse channel type attribute in an ibss join request
Prepare cfg80211 for IBSS HT:
* extend cfg80211 ibss struct with channel_type
* Check if extension channel can be used
* Export can_beacon_sec_chan for use in mac80211 (will be called
from ibss.c later).
Signed-off-by: Alexander Simon <an.alexsimon@googlemail.com>
[siwu@hrz.tu-chemnitz.de: Updates]
* fix cfg80211_can_beacon_ext_chan comment
* remove implicit channel_type enum assumptions
* remove radar channel flags check
* add HT IBSS feature flag
* reword commit message
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index f51e3bf..a187606 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -2785,9 +2785,11 @@
* @NL80211_FEATURE_SK_TX_STATUS: This driver supports reflecting back
* TX status to the socket error queue when requested with the
* socket option.
+ * @NL80211_FEATURE_HT_IBSS: This driver supports IBSS with HT datarates.
*/
enum nl80211_feature_flags {
NL80211_FEATURE_SK_TX_STATUS = 1 << 0,
+ NL80211_FEATURE_HT_IBSS = 1 << 1,
};
/**
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index f0e82b2..3de1c39 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1149,6 +1149,7 @@
u8 *ssid;
u8 *bssid;
struct ieee80211_channel *channel;
+ enum nl80211_channel_type channel_type;
u8 *ie;
u8 ssid_len, ie_len;
u16 beacon_interval;
@@ -3267,6 +3268,16 @@
const u8 *frame, size_t len,
int freq, gfp_t gfp);
+/*
+ * cfg80211_can_beacon_sec_chan - test if ht40 on extension channel can be used
+ * @wiphy: the wiphy
+ * @chan: main channel
+ * @channel_type: HT mode
+ */
+int cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
+ struct ieee80211_channel *chan,
+ enum nl80211_channel_type channel_type);
+
/* Logging, debugging and troubleshooting/diagnostic helpers. */
/* wiphy_printk helpers, similar to dev_printk */
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 17cd0c0..2fcfe09 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -6,6 +6,7 @@
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
*/
+#include <linux/export.h>
#include <net/cfg80211.h>
#include "core.h"
@@ -44,9 +45,9 @@
return chan;
}
-static bool can_beacon_sec_chan(struct wiphy *wiphy,
- struct ieee80211_channel *chan,
- enum nl80211_channel_type channel_type)
+int cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
+ struct ieee80211_channel *chan,
+ enum nl80211_channel_type channel_type)
{
struct ieee80211_channel *sec_chan;
int diff;
@@ -75,6 +76,7 @@
return true;
}
+EXPORT_SYMBOL(cfg80211_can_beacon_sec_chan);
int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev, int freq,
@@ -109,8 +111,8 @@
switch (channel_type) {
case NL80211_CHAN_HT40PLUS:
case NL80211_CHAN_HT40MINUS:
- if (!can_beacon_sec_chan(&rdev->wiphy, chan,
- channel_type)) {
+ if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, chan,
+ channel_type)) {
printk(KERN_DEBUG
"cfg80211: Secondary channel not "
"allowed to initiate communication\n");
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 8a9b4d8..ba43966 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4682,13 +4682,41 @@
ibss.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
}
- ibss.channel = ieee80211_get_channel(wiphy,
- nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
+ if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
+ enum nl80211_channel_type channel_type;
+
+ channel_type = nla_get_u32(
+ info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
+ if (channel_type != NL80211_CHAN_NO_HT &&
+ channel_type != NL80211_CHAN_HT20 &&
+ channel_type != NL80211_CHAN_HT40MINUS &&
+ channel_type != NL80211_CHAN_HT40PLUS)
+ return -EINVAL;
+
+ if (channel_type != NL80211_CHAN_NO_HT &&
+ !(wiphy->features & NL80211_FEATURE_HT_IBSS))
+ return -EINVAL;
+
+ ibss.channel_type = channel_type;
+ } else {
+ ibss.channel_type = NL80211_CHAN_NO_HT;
+ }
+
+ ibss.channel = rdev_freq_to_chan(rdev,
+ nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]),
+ ibss.channel_type);
if (!ibss.channel ||
ibss.channel->flags & IEEE80211_CHAN_NO_IBSS ||
ibss.channel->flags & IEEE80211_CHAN_DISABLED)
return -EINVAL;
+ /* Both channels should be able to initiate communication */
+ if ((ibss.channel_type == NL80211_CHAN_HT40PLUS ||
+ ibss.channel_type == NL80211_CHAN_HT40MINUS) &&
+ !cfg80211_can_beacon_sec_chan(&rdev->wiphy, ibss.channel,
+ ibss.channel_type))
+ return -EINVAL;
+
ibss.channel_fixed = !!info->attrs[NL80211_ATTR_FREQ_FIXED];
ibss.privacy = !!info->attrs[NL80211_ATTR_PRIVACY];