summaryrefslogtreecommitdiff
path: root/net/wireless
diff options
context:
space:
mode:
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/chan.c54
-rw-r--r--net/wireless/nl80211.c4
2 files changed, 56 insertions, 2 deletions
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index d0c92dddb26b..17cd0c04d139 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -44,6 +44,38 @@ 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)
+{
+ struct ieee80211_channel *sec_chan;
+ int diff;
+
+ switch (channel_type) {
+ case NL80211_CHAN_HT40PLUS:
+ diff = 20;
+ break;
+ case NL80211_CHAN_HT40MINUS:
+ diff = -20;
+ break;
+ default:
+ return false;
+ }
+
+ sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff);
+ if (!sec_chan)
+ return false;
+
+ /* we'll need a DFS capability later */
+ if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
+ IEEE80211_CHAN_PASSIVE_SCAN |
+ IEEE80211_CHAN_NO_IBSS |
+ IEEE80211_CHAN_RADAR))
+ return false;
+
+ return true;
+}
+
int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev, int freq,
enum nl80211_channel_type channel_type)
@@ -68,6 +100,28 @@ int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
if (!chan)
return -EINVAL;
+ /* Both channels should be able to initiate communication */
+ if (wdev && (wdev->iftype == NL80211_IFTYPE_ADHOC ||
+ wdev->iftype == NL80211_IFTYPE_AP ||
+ wdev->iftype == NL80211_IFTYPE_AP_VLAN ||
+ wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
+ wdev->iftype == NL80211_IFTYPE_P2P_GO)) {
+ switch (channel_type) {
+ case NL80211_CHAN_HT40PLUS:
+ case NL80211_CHAN_HT40MINUS:
+ if (!can_beacon_sec_chan(&rdev->wiphy, chan,
+ channel_type)) {
+ printk(KERN_DEBUG
+ "cfg80211: Secondary channel not "
+ "allowed to initiate communication\n");
+ return -EINVAL;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
result = rdev->ops->set_channel(&rdev->wiphy,
wdev ? wdev->netdev : NULL,
chan, channel_type);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 605553842226..b15eb77195d8 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -230,8 +230,8 @@ static int nl80211_prepare_netdev_dump(struct sk_buff *skb,
}
*rdev = cfg80211_get_dev_from_ifindex(sock_net(skb->sk), ifidx);
- if (IS_ERR(dev)) {
- err = PTR_ERR(dev);
+ if (IS_ERR(*rdev)) {
+ err = PTR_ERR(*rdev);
goto out_rtnl;
}