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@xxxxxxxxxxxxxxxx>
---
net/wireless/nl80211.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 63dfa60..c614af4 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6506,6 +6506,17 @@ static int nl80211_parse_random_mac(struct nlattr **attrs,
return 0;
}
+static bool cfg80211_off_channel_oper_allowed(struct wireless_dev *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];
@@ -6631,6 +6642,21 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
request->n_channels = i;
+ if (!cfg80211_off_channel_oper_allowed(wdev)) {
+ struct ieee80211_channel *chan;
+
+ if (request->n_channels != 1) {
+ err = -EBUSY;
+ goto out_free;
+ }
+
+ chan = request->channels[0];
+ if (chan->center_freq != wdev->chandef.chan->center_freq) {
+ err = -EBUSY;
+ goto out_free;
+ }
+ }
+
i = 0;
if (n_ssids) {
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) {
@@ -9053,6 +9079,7 @@ 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;
@@ -9081,6 +9108,14 @@ static int nl80211_remain_on_channel(struct sk_buff *skb,
if (err)
return err;
+ 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)
+ return -EBUSY;
+ }
+
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
@@ -9256,6 +9291,9 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
if (!chandef.chan && params.offchan)
return -EINVAL;
+ if (params.offchan && !cfg80211_off_channel_oper_allowed(wdev))
+ return -EBUSY;
+
params.buf = nla_data(info->attrs[NL80211_ATTR_FRAME]);
params.len = nla_len(info->attrs[NL80211_ATTR_FRAME]);
--
1.9.1
