From: Antonio Quartulli <antonio@xxxxxxxxxxxxx>
Userspace applications may be listening for events (e.g.
matching mgmt frame) on a given interface. If such interface
is deleted they would keep hanging because no event will be
delivered anymore.
Send a CMD_INTERFACE event on NETDEV_UNREGISTER to notify
userspace that the interface does not exist anymore.
Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxxxx>
---
net/wireless/core.c | 2 ++
net/wireless/nl80211.c | 31 +++++++++++++++++++++++++++++++
net/wireless/nl80211.h | 3 +++
3 files changed, 36 insertions(+)
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 389a3f2..ae4c148 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -913,6 +913,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
}
break;
case NETDEV_UNREGISTER:
+ nl80211_send_del_iface(rdev, dev, GFP_KERNEL);
+
/*
* It is possible to get NETDEV_UNREGISTER
* multiple times. To detect that, check
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f7cb121..61be4ea 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -10022,6 +10022,37 @@ void nl80211_send_disconnected(struct cfg80211_registered_device *rdev,
}
+void nl80211_send_del_iface(struct cfg80211_registered_device *rdev,
+ struct net_device *netdev, gfp_t gfp)
+{
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
+ if (!msg)
+ return;
+
+ hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_DEL_INTERFACE);
+ if (!hdr) {
+ nlmsg_free(msg);
+ return;
+ }
+
+ if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
+ nla_put_u32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex))
+ goto nla_put_failure;
+
+ genlmsg_end(msg, hdr);
+
+ 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);
+}
+
void nl80211_send_ibss_bssid(struct cfg80211_registered_device *rdev,
struct net_device *netdev, const u8 *bssid,
gfp_t gfp)
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 44341bf..6071557 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -59,6 +59,9 @@ nl80211_send_beacon_hint_event(struct wiphy *wiphy,
struct ieee80211_channel *channel_before,
struct ieee80211_channel *channel_after);
+void nl80211_send_del_iface(struct cfg80211_registered_device *rdev,
+ struct net_device *netdev, gfp_t gfp);
+
void nl80211_send_ibss_bssid(struct cfg80211_registered_device *rdev,
struct net_device *netdev, const u8 *bssid,
gfp_t gfp);
--
1.8.1.5
--
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