The dfs master device should monitor radar channels
for potential radar interference for a minimum of
CAC (channel availability check) time, during this
period no tx can occur. If no radar interference
is detected the dfs master may initiate the tx with
new NL80211_CMD_DFS_ENABLE_TX command.
If this command is invoked prior performing a CAC or
the time passed sines the beginning of the CAC is
less than min CAC time (60 sec), -EPERM is returned.
Signed-off-by: Victor Goldenshtein <victorg@xxxxxx>
---
include/linux/nl80211.h | 11 +++++++++++
include/net/cfg80211.h | 3 +++
net/wireless/nl80211.c | 36 ++++++++++++++++++++++++++++++++++++
3 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index ea6ce93..2f869a4 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -556,6 +556,15 @@
* @NL80211_CMD_RADAR_DETECT: Start radar detection in the driver/HW. Once
* radar detected usermode notified with this event.
*
+ * @NL80211_CMD_DFS_ENABLE_TX: Initiate tx after verifying radar clearness on
+ * dfs channel. The dfs master device should monitor radar channels
+ * for potential radar interference for a minimum of CAC (channel
+ * availability check) time, during this period no tx can occur. If no
+ * radar interference is detected during this period the dfs master may
+ * initiate the tx. If this command is invoked prior performing a CAC or
+ * the time passed sines the beginning of the CAC is less than
+ * NL80211_DFS_MIN_CAC_TIME_MS, -EPERM is returned.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -701,6 +710,8 @@ enum nl80211_commands {
NL80211_CMD_RADAR_DETECT,
+ NL80211_CMD_DFS_ENABLE_TX,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 32dfc1f..030ed2f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1531,6 +1531,7 @@ struct cfg80211_gtk_rekey_data {
* See @ethtool_ops.get_strings
*
* @start_radar_detection: Start radar detection in the driver.
+ * @dfs_en_tx: Enable tx after radar interference check.
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -1740,6 +1741,8 @@ struct cfg80211_ops {
int (*start_radar_detection)(struct wiphy *wiphy,
struct net_device *dev,
struct ieee80211_channel *chan);
+ int (*dfs_en_tx)(struct wiphy *wiphy, struct net_device *dev,
+ struct ieee80211_channel *chan);
};
/*
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 573c966..eabe819 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4273,6 +4273,34 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
return cfg80211_start_radar_detection(rdev, dev, chan);
}
+static int nl80211_dfs_en_tx(struct sk_buff *skb, struct genl_info *info)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ struct net_device *dev = info->user_ptr[1];
+ bool dfs_supported = !!(rdev->wiphy.features & NL80211_FEATURE_DFS);
+ struct ieee80211_channel *chan;
+ int freq;
+
+ if (!rdev->ops->dfs_en_tx || !dfs_supported)
+ return -EOPNOTSUPP;
+
+ if (info->attrs[NL80211_ATTR_WIPHY_FREQ])
+ freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
+ else
+ return -EINVAL;
+
+ chan = ieee80211_get_channel(&rdev->wiphy, freq);
+ if (!chan)
+ return -EINVAL;
+
+ if ((!chan->radar_detect_timeout ||
+ time_is_after_jiffies(chan->radar_detect_timeout)) &&
+ (chan->flags & IEEE80211_CHAN_RADAR))
+ return -EPERM;
+
+ return rdev->ops->dfs_en_tx(&rdev->wiphy, dev, chan);
+}
+
static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
u32 seq, int flags,
struct cfg80211_registered_device *rdev,
@@ -7030,6 +7058,14 @@ static struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL80211_CMD_DFS_ENABLE_TX,
+ .doit = nl80211_dfs_en_tx,
+ .policy = nl80211_policy,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
--
1.7.5.4
--
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