Check if the requested HT mode can be used.
Extend cfg80211 IBSS struct for HT mode.
Signed-off-by: Alexander Simon <alexander.simon@xxxxxxxxx>
---
As there were no replies for my RFC post, i am resending this as PATCH.
include/net/cfg80211.h | 1 +
net/wireless/chan.c | 2 +-
net/wireless/core.h | 3 +++
net/wireless/nl80211.c | 34 +++++++++++++++++++++++++++++++---
4 files changed, 36 insertions(+), 4 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d17f47f..738db17 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1040,6 +1040,7 @@ 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;
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 17cd0c0..cd630e1 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -44,7 +44,7 @@ rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
return chan;
}
-static bool can_beacon_sec_chan(struct wiphy *wiphy,
+bool can_beacon_sec_chan(struct wiphy *wiphy,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type)
{
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 8672e02..a7d8e59 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -441,6 +441,9 @@ cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
struct ieee80211_channel *
rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
int freq, enum nl80211_channel_type channel_type);
+bool can_beacon_sec_chan(struct wiphy *wiphy,
+ struct ieee80211_channel *chan,
+ enum nl80211_channel_type channel_type);
int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev, int freq,
enum nl80211_channel_type channel_type);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 28d2aa1..7f3f46c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4346,12 +4346,40 @@ 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_NO_HT &&
+ channel_type != NL80211_CHAN_HT20 &&
+ channel_type != NL80211_CHAN_HT40PLUS &&
+ channel_type != NL80211_CHAN_HT40MINUS)
+ 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_PASSIVE_SCAN ||
ibss.channel->flags & IEEE80211_CHAN_NO_IBSS ||
- ibss.channel->flags & IEEE80211_CHAN_DISABLED)
+ ibss.channel->flags & IEEE80211_CHAN_RADAR)
+ return -EINVAL;
+
+ /* Both channels should be able to initiate communication */
+ if ((ibss.channel_type == NL80211_CHAN_HT40PLUS ||
+ ibss.channel_type == NL80211_CHAN_HT40MINUS) &&
+ !can_beacon_sec_chan(&rdev->wiphy, ibss.channel,
+ ibss.channel_type)) {
+ printk(KERN_DEBUG
+ "cfg80211: Secondary channel not "
+ "allowed to initiate communication\n");
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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