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authorVasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>2017-02-27 17:04:34 +0530
committerJohannes Berg <johannes.berg@intel.com>2017-03-06 13:54:19 +0100
commit34373d12f3cbb74960a73431138ef619d857996f (patch)
tree1939db7951c3b42925d9c43c61e76d01ec208fee /net/wireless
parentb35a51c7dd25a823767969e3089542d7478777e9 (diff)
downloadlinux-34373d12f3cbb74960a73431138ef619d857996f.tar.bz2
cfg80211: Disallow moving out of operating DFS channel in non-ETSI
For non-ETSI regulatory domain, CAC result on DFS channel may not be valid once moving out of that channel (as done during remain-on-channel, scannning and off-channel tx). Running CAC on an operating DFS channel after every off-channel operation will only add complexity and disturb the current link. Better do not allow any off-channel switch from a DFS operating channel in non-ETSI domain. Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/nl80211.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d516527fcb8e..b15903b9c0ab 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6556,6 +6556,19 @@ static int nl80211_parse_random_mac(struct nlattr **attrs,
return 0;
}
+static bool cfg80211_off_channel_oper_allowed(struct wireless_dev *wdev)
+{
+ ASSERT_WDEV_LOCK(wdev);
+
+ if (!cfg80211_beaconing_iface_active(wdev))
+ return true;
+
+ if (!(wdev->chandef.chan->flags & IEEE80211_CHAN_RADAR))
+ return true;
+
+ return regulatory_pre_cac_allowed(wdev->wiphy);
+}
+
static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -6681,6 +6694,25 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
request->n_channels = i;
+ wdev_lock(wdev);
+ if (!cfg80211_off_channel_oper_allowed(wdev)) {
+ struct ieee80211_channel *chan;
+
+ if (request->n_channels != 1) {
+ wdev_unlock(wdev);
+ err = -EBUSY;
+ goto out_free;
+ }
+
+ chan = request->channels[0];
+ if (chan->center_freq != wdev->chandef.chan->center_freq) {
+ wdev_unlock(wdev);
+ err = -EBUSY;
+ goto out_free;
+ }
+ }
+ wdev_unlock(wdev);
+
i = 0;
if (n_ssids) {
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) {
@@ -9103,6 +9135,7 @@ static int nl80211_remain_on_channel(struct sk_buff *skb,
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct wireless_dev *wdev = info->user_ptr[1];
struct cfg80211_chan_def chandef;
+ const struct cfg80211_chan_def *compat_chandef;
struct sk_buff *msg;
void *hdr;
u64 cookie;
@@ -9131,6 +9164,18 @@ static int nl80211_remain_on_channel(struct sk_buff *skb,
if (err)
return err;
+ wdev_lock(wdev);
+ if (!cfg80211_off_channel_oper_allowed(wdev) &&
+ !cfg80211_chandef_identical(&wdev->chandef, &chandef)) {
+ compat_chandef = cfg80211_chandef_compatible(&wdev->chandef,
+ &chandef);
+ if (compat_chandef != &chandef) {
+ wdev_unlock(wdev);
+ return -EBUSY;
+ }
+ }
+ wdev_unlock(wdev);
+
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
@@ -9306,6 +9351,13 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
if (!chandef.chan && params.offchan)
return -EINVAL;
+ wdev_lock(wdev);
+ if (params.offchan && !cfg80211_off_channel_oper_allowed(wdev)) {
+ wdev_unlock(wdev);
+ return -EBUSY;
+ }
+ wdev_unlock(wdev);
+
params.buf = nla_data(info->attrs[NL80211_ATTR_FRAME]);
params.len = nla_len(info->attrs[NL80211_ATTR_FRAME]);