linux/net/openvswitch
David S. Miller cf124db566 net: Fix inconsistent teardown and release of private netdev state.
Network devices can allocate reasources and private memory using
netdev_ops->ndo_init().  However, the release of these resources
can occur in one of two different places.

Either netdev_ops->ndo_uninit() or netdev->destructor().

The decision of which operation frees the resources depends upon
whether it is necessary for all netdev refs to be released before it
is safe to perform the freeing.

netdev_ops->ndo_uninit() presumably can occur right after the
NETDEV_UNREGISTER notifier completes and the unicast and multicast
address lists are flushed.

netdev->destructor(), on the other hand, does not run until the
netdev references all go away.

Further complicating the situation is that netdev->destructor()
almost universally does also a free_netdev().

This creates a problem for the logic in register_netdevice().
Because all callers of register_netdevice() manage the freeing
of the netdev, and invoke free_netdev(dev) if register_netdevice()
fails.

If netdev_ops->ndo_init() succeeds, but something else fails inside
of register_netdevice(), it does call ndo_ops->ndo_uninit().  But
it is not able to invoke netdev->destructor().

This is because netdev->destructor() will do a free_netdev() and
then the caller of register_netdevice() will do the same.

However, this means that the resources that would normally be released
by netdev->destructor() will not be.

Over the years drivers have added local hacks to deal with this, by
invoking their destructor parts by hand when register_netdevice()
fails.

Many drivers do not try to deal with this, and instead we have leaks.

Let's close this hole by formalizing the distinction between what
private things need to be freed up by netdev->destructor() and whether
the driver needs unregister_netdevice() to perform the free_netdev().

netdev->priv_destructor() performs all actions to free up the private
resources that used to be freed by netdev->destructor(), except for
free_netdev().

netdev->needs_free_netdev is a boolean that indicates whether
free_netdev() should be done at the end of unregister_netdevice().

Now, register_netdevice() can sanely release all resources after
ndo_ops->ndo_init() succeeds, by invoking both ndo_ops->ndo_uninit()
and netdev->priv_destructor().

And at the end of unregister_netdevice(), we invoke
netdev->priv_destructor() and optionally call free_netdev().

Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-07 15:53:24 -04:00
..
Kconfig openvswitch: call only into reachable nf-nat code 2016-03-28 17:58:59 +02:00
Makefile openvswitch: Remove conntrack Kconfig option. 2015-09-06 23:48:33 -07:00
actions.c Openvswitch: Refactor sample and recirc actions implementation 2017-03-22 11:28:35 -07:00
conntrack.c netfilter: introduce nf_conntrack_helper_put helper function 2017-05-15 12:42:29 +02:00
conntrack.h openvswitch: Pack struct sw_flow_key. 2017-02-09 22:59:34 -05:00
datapath.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
datapath.h openvswitch: Optimize sample action for the clone use cases 2017-03-22 11:28:35 -07:00
dp_notify.c openvswitch: fix hangup on vxlan/gre/geneve device deletion 2015-12-03 14:29:25 -05:00
flow.c openvswitch: Fix ovs_flow_key_update() 2017-04-01 12:16:46 -07:00
flow.h openvswitch: Pack struct sw_flow_key. 2017-02-09 22:59:34 -05:00
flow_netlink.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
flow_netlink.h openvswitch: Add original direction conntrack tuple to sw_flow_key. 2017-02-09 22:59:34 -05:00
flow_table.c openvswitch: use percpu flow stats 2016-09-18 22:14:01 -04:00
flow_table.h openvswitch: Zero flows on allocation. 2015-09-22 17:33:41 -07:00
vport-geneve.c openvswitch: do not ignore netdev errors when creating tunnel vports 2016-08-10 23:13:23 -07:00
vport-gre.c openvswitch: do not ignore netdev errors when creating tunnel vports 2016-08-10 23:13:23 -07:00
vport-internal_dev.c net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
vport-internal_dev.h openvswitch: introduce rtnl ops stub 2014-07-01 14:40:17 -07:00
vport-netdev.c openvswitch: allow L3 netdev ports 2016-11-13 00:51:02 -05:00
vport-netdev.h openvswitch: Use dev_queue_xmit for vport send. 2015-10-22 06:46:16 -07:00
vport-vxlan.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
vport.c openvswitch: add processing of L3 packets 2016-11-13 00:51:02 -05:00
vport.h openvswitch: pass mac_proto to ovs_vport_send 2016-11-13 00:51:02 -05:00