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authorSriram R <srirrama@codeaurora.org>2018-12-04 17:46:52 +0530
committerJohannes Berg <johannes.berg@intel.com>2018-12-18 14:13:05 +0100
commit30c63115e20b70f89b7cfb66b35e2a0ef4b0ef07 (patch)
tree360700ca3908bc0d56e51d1e526a9af0123e3110 /net/wireless
parent344f8e00933da8c275fa293caadfc62680d46d21 (diff)
downloadlinux-stericsson-30c63115e20b70f89b7cfb66b35e2a0ef4b0ef07.tar.gz
nl80211: Add support to notify radar event info received from STA
Currently radar detection and corresponding channel switch is handled at the AP device. STA ignores these detected radar events since the radar signal can be seen mostly by the AP as well. But in scenarios where a radar signal is seen only at STA, notifying this event to the AP which can trigger a channel switch can be useful. Stations can report such radar events autonomously through Spectrum management (Measurement Report) action frame to its AP. The userspace on processing the report can notify the kernel with the use of the added NL80211_CMD_NOTIFY_RADAR to indicate the detected event and inturn adding the reported channel to NOL. Signed-off-by: Sriram R <srirrama@codeaurora.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/nl80211.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4e9133e4587b..71a54ada377b 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7990,6 +7990,60 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
return err;
}
+static int nl80211_notify_radar_detection(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];
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+ struct wiphy *wiphy = wdev->wiphy;
+ struct cfg80211_chan_def chandef;
+ enum nl80211_dfs_regions dfs_region;
+ int err;
+
+ dfs_region = reg_get_dfs_region(wiphy);
+ if (dfs_region == NL80211_DFS_UNSET) {
+ GENL_SET_ERR_MSG(info,
+ "DFS Region is not set. Unexpected Radar indication");
+ return -EINVAL;
+ }
+
+ err = nl80211_parse_chandef(rdev, info, &chandef);
+ if (err) {
+ GENL_SET_ERR_MSG(info, "Unable to extract chandef info");
+ return err;
+ }
+
+ err = cfg80211_chandef_dfs_required(wiphy, &chandef, wdev->iftype);
+ if (err < 0) {
+ GENL_SET_ERR_MSG(info, "chandef is invalid");
+ return err;
+ }
+
+ if (err == 0) {
+ GENL_SET_ERR_MSG(info,
+ "Unexpected Radar indication for chandef/iftype");
+ return -EINVAL;
+ }
+
+ /* Do not process this notification if radar is already detected
+ * by kernel on this channel, and return success.
+ */
+ if (chandef.chan->dfs_state == NL80211_DFS_UNAVAILABLE)
+ return 0;
+
+ cfg80211_set_dfs_state(wiphy, &chandef, NL80211_DFS_UNAVAILABLE);
+
+ cfg80211_sched_dfs_chan_update(rdev);
+
+ memcpy(&rdev->radar_chandef, &chandef, sizeof(chandef));
+
+ /* Propagate this notification to other radios as well */
+ queue_work(cfg80211_wq, &rdev->propagate_radar_detect_wk);
+
+ return 0;
+}
+
static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -14074,6 +14128,14 @@ static const struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_WDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL80211_CMD_NOTIFY_RADAR,
+ .doit = nl80211_notify_radar_detection,
+ .policy = nl80211_policy,
+ .flags = GENL_UNS_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
static struct genl_family nl80211_fam __ro_after_init = {