[RFC PATCH 2/2] nl80211: implement beacon change notifier

[Sergey Matyukevich]

From: Vasily Ulyanov <vulya...@quantenna.com>

Notify user-space listeners about beacon data change.

Signed-off-by: Vasily Ulyanov <vulya...@quantenna.com>
---
 net/wireless/nl80211.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f03f9989efbc..98e52e5ffc13 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3950,6 +3950,26 @@ static int nl80211_send_beacon(struct sk_buff *msg, u32 
portid,
        return -EMSGSIZE;
 }
 
+static void nl80211_notify_beacon_change(struct net_device *dev,
+                                        enum nl80211_commands cmd,
+                                        struct cfg80211_beacon_data *bcn)
+{
+       struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
+       struct sk_buff *msg;
+
+       msg = nlmsg_new(nl80211_beacon_size(bcn), GFP_KERNEL);
+       if (!msg)
+               return;
+
+       if (nl80211_send_beacon(msg, cmd, 0, 0, 0, bcn) < 0) {
+               nlmsg_free(msg);
+               return;
+       }
+
+       genlmsg_multicast_netns(&nl80211_fam, wiphy_net(wiphy), msg, 0,
+                               NL80211_MCGRP_MLME, GFP_KERNEL);
+}
+
 static void nl80211_check_ap_rate_selectors(struct cfg80211_ap_settings 
*params,
                                            const u8 *rates)
 {
@@ -4250,6 +4270,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct 
genl_info *info)
                wdev->ssid_len = params.ssid_len;
                memcpy(wdev->ssid, params.ssid, wdev->ssid_len);
                nl80211_assign_beacon(&wdev->beacon, &new_bcn);
+               nl80211_notify_beacon_change(dev, NL80211_CMD_START_AP,
+                                            &wdev->beacon);
        }
        wdev_unlock(wdev);
 
@@ -4317,8 +4339,11 @@ static int nl80211_set_beacon(struct sk_buff *skb, 
struct genl_info *info)
 
        wdev_lock(wdev);
        err = rdev_change_beacon(rdev, dev, &params);
-       if (!err)
+       if (!err) {
                nl80211_assign_beacon(&wdev->beacon, &merged_bcn);
+               nl80211_notify_beacon_change(dev, NL80211_CMD_SET_BEACON,
+                                            &wdev->beacon);
+       }
        wdev_unlock(wdev);
 
        if (err)
-- 
2.11.0