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authorJohannes Berg <johannes@sipsolutions.net>2009-08-07 17:22:35 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-08-14 09:13:42 -0400
commit59bbb6f7574bc693ed8313b98eac641116c95b94 (patch)
treeda24ed15c5e375782e79b3dab7022d2100a7987a /net/wireless/ibss.c
parentf26b32ed4bd5780855a79bb17fb1a431fa867dad (diff)
downloadlinux-59bbb6f7574bc693ed8313b98eac641116c95b94.tar.bz2
cfg80211: validate channel settings across interfaces
Currently, there's a problem that affects regulatory enforcement and connection stability, in that it is possible to switch the channel while connected to a network or joined to an IBSS. The problem comes from the fact that we only validate the channel against the current interface's type, not against any other interface. Thus, you have any type of interface up, additionally bring up a monitor mode interface and switch the channel on the monitor. This will obviously also switch the channel on the other interface. The problem now is that if you do that while sending beacons for IBSS mode, you can switch to a disabled channel or a channel that doesn't allow beaconing. Combined with a managed mode interface connected to an AP instead of an IBSS interface, you can easily break the connection that way. To fix this, this patch validates any channel change with all available interfaces, and disallows such changes on secondary interfaces if another interface is connected to an AP or joined to an IBSS. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/ibss.c')
-rw-r--r--net/wireless/ibss.c61
1 files changed, 39 insertions, 22 deletions
diff --git a/net/wireless/ibss.c b/net/wireless/ibss.c
index 4d7a084b35e2..42840a01be74 100644
--- a/net/wireless/ibss.c
+++ b/net/wireless/ibss.c
@@ -78,10 +78,15 @@ int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
struct cfg80211_cached_keys *connkeys)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
+ struct ieee80211_channel *chan;
int err;
ASSERT_WDEV_LOCK(wdev);
+ chan = rdev_fixed_channel(rdev, wdev);
+ if (chan && chan != params->channel)
+ return -EBUSY;
+
if (wdev->ssid_len)
return -EALREADY;
@@ -112,9 +117,11 @@ int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev = dev->ieee80211_ptr;
int err;
+ mutex_lock(&rdev->devlist_mtx);
wdev_lock(wdev);
err = __cfg80211_join_ibss(rdev, dev, params, connkeys);
wdev_unlock(wdev);
+ mutex_unlock(&rdev->devlist_mtx);
return err;
}
@@ -264,27 +271,32 @@ int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
struct iw_request_info *info,
- struct iw_freq *freq, char *extra)
+ struct iw_freq *wextfreq, char *extra)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
- struct ieee80211_channel *chan;
- int err;
+ struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+ struct ieee80211_channel *chan = NULL;
+ int err, freq;
/* call only for ibss! */
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
return -EINVAL;
- if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
+ if (!rdev->ops->join_ibss)
return -EOPNOTSUPP;
- chan = cfg80211_wext_freq(wdev->wiphy, freq);
- if (chan && IS_ERR(chan))
- return PTR_ERR(chan);
+ freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
+ if (freq < 0)
+ return freq;
- if (chan &&
- (chan->flags & IEEE80211_CHAN_NO_IBSS ||
- chan->flags & IEEE80211_CHAN_DISABLED))
- return -EINVAL;
+ if (freq) {
+ chan = ieee80211_get_channel(wdev->wiphy, freq);
+ if (!chan)
+ return -EINVAL;
+ if (chan->flags & IEEE80211_CHAN_NO_IBSS ||
+ chan->flags & IEEE80211_CHAN_DISABLED)
+ return -EINVAL;
+ }
if (wdev->wext.ibss.channel == chan)
return 0;
@@ -292,8 +304,7 @@ int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
wdev_lock(wdev);
err = 0;
if (wdev->ssid_len)
- err = __cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
- dev, true);
+ err = __cfg80211_leave_ibss(rdev, dev, true);
wdev_unlock(wdev);
if (err)
@@ -307,9 +318,11 @@ int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
wdev->wext.ibss.channel_fixed = false;
}
+ mutex_lock(&rdev->devlist_mtx);
wdev_lock(wdev);
- err = cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
+ err = cfg80211_ibss_wext_join(rdev, wdev);
wdev_unlock(wdev);
+ mutex_unlock(&rdev->devlist_mtx);
return err;
}
@@ -347,6 +360,7 @@ int cfg80211_ibss_wext_siwessid(struct net_device *dev,
struct iw_point *data, char *ssid)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
+ struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
size_t len = data->length;
int err;
@@ -354,14 +368,13 @@ int cfg80211_ibss_wext_siwessid(struct net_device *dev,
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
return -EINVAL;
- if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
+ if (!rdev->ops->join_ibss)
return -EOPNOTSUPP;
wdev_lock(wdev);
err = 0;
if (wdev->ssid_len)
- err = __cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
- dev, true);
+ err = __cfg80211_leave_ibss(rdev, dev, true);
wdev_unlock(wdev);
if (err)
@@ -375,9 +388,11 @@ int cfg80211_ibss_wext_siwessid(struct net_device *dev,
memcpy(wdev->wext.ibss.ssid, ssid, len);
wdev->wext.ibss.ssid_len = len;
+ mutex_lock(&rdev->devlist_mtx);
wdev_lock(wdev);
- err = cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
+ err = cfg80211_ibss_wext_join(rdev, wdev);
wdev_unlock(wdev);
+ mutex_unlock(&rdev->devlist_mtx);
return err;
}
@@ -414,6 +429,7 @@ int cfg80211_ibss_wext_siwap(struct net_device *dev,
struct sockaddr *ap_addr, char *extra)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
+ struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
u8 *bssid = ap_addr->sa_data;
int err;
@@ -421,7 +437,7 @@ int cfg80211_ibss_wext_siwap(struct net_device *dev,
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_ADHOC))
return -EINVAL;
- if (!wiphy_to_dev(wdev->wiphy)->ops->join_ibss)
+ if (!rdev->ops->join_ibss)
return -EOPNOTSUPP;
if (ap_addr->sa_family != ARPHRD_ETHER)
@@ -443,8 +459,7 @@ int cfg80211_ibss_wext_siwap(struct net_device *dev,
wdev_lock(wdev);
err = 0;
if (wdev->ssid_len)
- err = __cfg80211_leave_ibss(wiphy_to_dev(wdev->wiphy),
- dev, true);
+ err = __cfg80211_leave_ibss(rdev, dev, true);
wdev_unlock(wdev);
if (err)
@@ -456,9 +471,11 @@ int cfg80211_ibss_wext_siwap(struct net_device *dev,
} else
wdev->wext.ibss.bssid = NULL;
+ mutex_lock(&rdev->devlist_mtx);
wdev_lock(wdev);
- err = cfg80211_ibss_wext_join(wiphy_to_dev(wdev->wiphy), wdev);
+ err = cfg80211_ibss_wext_join(rdev, wdev);
wdev_unlock(wdev);
+ mutex_unlock(&rdev->devlist_mtx);
return err;
}