Extend cfg80211 ibss struct for HT mode
Check if extension channel can be used
Export can_beacon_sec_chan for use in mac80211.
Must be called from ibss.c because the channel may change.
Signed-off-by: Alexander Simon <an.alexsimon@xxxxxxxxxxxxxx>
---
include/net/cfg80211.h | 11 +++++++++++
net/wireless/chan.c | 11 ++++++-----
net/wireless/nl80211.c | 25 +++++++++++++++++++++++--
3 files changed, 40 insertions(+), 7 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index b42136a..eaa3a9d 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1105,6 +1105,7 @@ struct cfg80211_ibss_params {
u8 *ssid;
u8 *bssid;
struct ieee80211_channel *channel;
+ enum nl80211_channel_type channel_type;
u8 *ie;
u8 ssid_len, ie_len;
u16 beacon_interval;
@@ -3118,6 +3119,16 @@ void cfg80211_cqm_pktloss_notify(struct net_device *dev,
void cfg80211_gtk_rekey_notify(struct net_device *dev, const u8 *bssid,
const u8 *replay_ctr, gfp_t gfp);
+/**
+ * cfg80211_can_use_ext_chan - test if ht40 on extension channel can be used
+ * @wiphy: the wiphy
+ * @chan: main channel
+ * @channel_type: HT mode
+ */
+bool 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..81740af 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -44,9 +44,9 @@ rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
return chan;
}
-static bool can_beacon_sec_chan(struct wiphy *wiphy,
- struct ieee80211_channel *chan,
- enum nl80211_channel_type channel_type)
+bool 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 +75,7 @@ static bool can_beacon_sec_chan(struct wiphy *wiphy,
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 +110,8 @@ int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
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 1108954..320f61e 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4537,13 +4537,34 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
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_HT40PLUS)
+ 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_RADAR ||
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];
--
1.7.3.4
--
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