cfg80211: allow using CQM event to notify packet loss

This adds the ability for drivers to use CQM events
to notify about packet loss for specific stations
(which could be the AP for the managed mode case).
Since the threshold might be determined by the
driver (it isn't passed in right now) it will be
passed out of the driver to userspace in the event.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 61 insertions, 0 deletions

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 26838d903b9..6980a0c315b 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -1028,3 +1028,15 @@ void cfg80211_cqm_rssi_notify(struct net_device *dev,
         nl80211_send_cqm_rssi_notify(rdev, dev, rssi_event, gfp);
 }
 EXPORT_SYMBOL(cfg80211_cqm_rssi_notify);
+
+void cfg80211_cqm_pktloss_notify(struct net_device *dev,
+                                 const u8 *peer, u32 num_packets, gfp_t gfp)
+{
+        struct wireless_dev *wdev = dev->ieee80211_ptr;
+        struct wiphy *wiphy = wdev->wiphy;
+        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+        /* Indicate roaming trigger event to user space */
+        nl80211_send_cqm_pktloss_notify(rdev, dev, peer, num_packets, gfp);
+}
+EXPORT_SYMBOL(cfg80211_cqm_pktloss_notify);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 8734efa663d..67ff7e92cb9 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5715,6 +5715,51 @@ nl80211_send_cqm_rssi_notify(struct cfg80211_registered_device *rdev,
         nlmsg_free(msg);
 }
 
+void
+nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
+                                struct net_device *netdev, const u8 *peer,
+                                u32 num_packets, gfp_t gfp)
+{
+        struct sk_buff *msg;
+        struct nlattr *pinfoattr;
+        void *hdr;
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+        if (!msg)
+                return;
+
+        hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_NOTIFY_CQM);
+        if (!hdr) {
+                nlmsg_free(msg);
+                return;
+        }
+
+        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
+        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
+        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, peer);
+
+        pinfoattr = nla_nest_start(msg, NL80211_ATTR_CQM);
+        if (!pinfoattr)
+                goto nla_put_failure;
+
+        NLA_PUT_U32(msg, NL80211_ATTR_CQM_PKT_LOSS_EVENT, num_packets);
+
+        nla_nest_end(msg, pinfoattr);
+
+        if (genlmsg_end(msg, hdr) < 0) {
+                nlmsg_free(msg);
+                return;
+        }
+
+        genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
+                                nl80211_mlme_mcgrp.id, gfp);
+        return;
+
+ nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+        nlmsg_free(msg);
+}
+
 static int nl80211_netlink_notify(struct notifier_block * nb,
                                   unsigned long state,
                                   void *_notify)
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 30d2f939150..16c2f719076 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -87,5 +87,9 @@ nl80211_send_cqm_rssi_notify(struct cfg80211_registered_device *rdev,
                              struct net_device *netdev,
                              enum nl80211_cqm_rssi_threshold_event rssi_event,
                              gfp_t gfp);
+void
+nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
+                                struct net_device *netdev, const u8 *peer,
+                                u32 num_packets, gfp_t gfp);
 
 #endif /* __NET_WIRELESS_NL80211_H */