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cfg80211: NL80211_ATTR_SOCKET_OWNER support for CMD_CONNECT

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Disconnect or deauthenticate when the owning socket is closed if this
flag is supplied to CMD_CONNECT or CMD_ASSOCIATE.  This may be used
to ensure userspace daemon doesn't leave an unmanaged connection behind.

In some situations it would be possible to account for that, to some
degree, in the deamon restart code or in the up/down scripts without
the use of this attribute.  But there will be systems where the daemon
can go away for varying periods without a warning due to local resource
management.

Signed-off-by: Andrew Zaborowski <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Andrzej Zaborowski 2017-01-06 16:33:43 -05:00 • committed by Johannes Berg
commit bd2522b168
7 changed files with 76 additions and 1 deletions
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3
net/wireless/core.c
View file

@ -1142,6 +1142,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
dev->priv_flags |= IFF_DONT_BRIDGE;
INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
break;
case NETDEV_GOING_DOWN:
@ -1230,6 +1232,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
#ifdef CONFIG_CFG80211_WEXT
kzfree(wdev->wext.keys);
#endif
flush_work(&wdev->disconnect_wk);
}
/*
* synchronise (so that we won't find this netdev

1
net/wireless/core.h
View file

@ -400,6 +400,7 @@ void __cfg80211_roamed(struct wireless_dev *wdev,
const u8 *resp_ie, size_t resp_ie_len);
int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev);
void cfg80211_autodisconnect_wk(struct work_struct *work);
/* SME implementation */
void cfg80211_conn_work(struct work_struct *work);

5
net/wireless/mlme.c
View file

@ -345,6 +345,11 @@ int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
!ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
return 0;
if (ether_addr_equal(wdev->disconnect_bssid, bssid) ||
(wdev->current_bss &&
ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
wdev->conn_owner_nlportid = 0;
return rdev_deauth(rdev, dev, &req);
}

26
net/wireless/nl80211.c
View file

@ -8050,8 +8050,17 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
err = nl80211_crypto_settings(rdev, info, &req.crypto, 1);
if (!err) {
wdev_lock(dev->ieee80211_ptr);
err = cfg80211_mlme_assoc(rdev, dev, chan, bssid,
ssid, ssid_len, &req);
if (!err && info->attrs[NL80211_ATTR_SOCKET_OWNER]) {
dev->ieee80211_ptr->conn_owner_nlportid =
info->snd_portid;
memcpy(dev->ieee80211_ptr->disconnect_bssid,
bssid, ETH_ALEN);
}
wdev_unlock(dev->ieee80211_ptr);
}
@ -8770,11 +8779,24 @@ static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
}
wdev_lock(dev->ieee80211_ptr);
err = cfg80211_connect(rdev, dev, &connect, connkeys,
connect.prev_bssid);
wdev_unlock(dev->ieee80211_ptr);
if (err)
kzfree(connkeys);
if (!err && info->attrs[NL80211_ATTR_SOCKET_OWNER]) {
dev->ieee80211_ptr->conn_owner_nlportid = info->snd_portid;
if (connect.bssid)
memcpy(dev->ieee80211_ptr->disconnect_bssid,
connect.bssid, ETH_ALEN);
else
memset(dev->ieee80211_ptr->disconnect_bssid,
0, ETH_ALEN);
}
wdev_unlock(dev->ieee80211_ptr);
return err;
}
@ -14491,6 +14513,8 @@ static int nl80211_netlink_notify(struct notifier_block * nb,
if (wdev->owner_nlportid == notify->portid)
schedule_destroy_work = true;
else if (wdev->conn_owner_nlportid == notify->portid)
schedule_work(&wdev->disconnect_wk);
}
spin_lock_bh(&rdev->beacon_registrations_lock);

33
net/wireless/sme.c
View file

@ -727,6 +727,7 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
kzfree(wdev->connect_keys);
wdev->connect_keys = NULL;
wdev->ssid_len = 0;
wdev->conn_owner_nlportid = 0;
if (bss) {
cfg80211_unhold_bss(bss_from_pub(bss));
cfg80211_put_bss(wdev->wiphy, bss);
@ -955,6 +956,7 @@ void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
wdev->current_bss = NULL;
wdev->ssid_len = 0;
wdev->conn_owner_nlportid = 0;
nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);
@ -1098,6 +1100,8 @@ int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
kzfree(wdev->connect_keys);
wdev->connect_keys = NULL;
wdev->conn_owner_nlportid = 0;
if (wdev->conn)
err = cfg80211_sme_disconnect(wdev, reason);
else if (!rdev->ops->disconnect)
@ -1107,3 +1111,32 @@ int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
return err;
}
/*
* Used to clean up after the connection / connection attempt owner socket
* disconnects
*/
void cfg80211_autodisconnect_wk(struct work_struct *work)
{
struct wireless_dev *wdev =
container_of(work, struct wireless_dev, disconnect_wk);
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
wdev_lock(wdev);
if (wdev->conn_owner_nlportid) {
/*
* Use disconnect_bssid if still connecting and ops->disconnect
* not implemented. Otherwise we can use cfg80211_disconnect.
*/
if (rdev->ops->disconnect || wdev->current_bss)
cfg80211_disconnect(rdev, wdev->netdev,
WLAN_REASON_DEAUTH_LEAVING, true);
else
cfg80211_mlme_deauth(rdev, wdev->netdev,
wdev->disconnect_bssid, NULL, 0,
WLAN_REASON_DEAUTH_LEAVING, false);
}
wdev_unlock(wdev);
}