[v3,00/21] exit_net checks for objects initialized in net_init hook

This patch set checks that lists initialized in net_init hooks were
return to initial state at end of net_exit hooks.

I hope such checks allows to detect leaked per-netns objects.
Also I hope that all new pernet_operations will inherit such checks too.

I assume that elements added into per-net lists should not live longer than net namespace,
and should be deleted from the list. I think exit_net hook is good place for such check.

Recently I've found lost list_entry and enabled timer on stop of net namespace.
Then I've reviewed all existing pernet_operations and found that many drivers
have such checks already. So I decided to complete this task and add such checks
into all affected subsystems.

v3:
- use net->ns.inum as net Id
- removed patches for hashlimit and recent,
    they handle tables list in exit_net hook.
- added patches for grace and lockd

v2:
- net pointer removed from output
- fixed compilation for phonet driver

Vasily Averin (21):
  grace: replace BUG_ON by WARN_ONCE in exit_net hook
  lockd: added cleanup checks in exit_net hook
  exit_net cleanup: geneve sock_list check
  ppp: exit_net cleanup checks added
  vxlan: exit_net cleanup checks added
  netdev: exit_net cleanup check added
  nfs4blocklayout: exit_net cleanup check added
  nfs client: exit_net cleanup check added
  fib_notifier: exit_net cleanup check added
  fib_rules: exit_net cleanup check added
  clusterip: exit_net cleanup check added
  xfrm6_tunnel: exit_net cleanup check added
  af_key: replace BUG_ON on WARN_ONCE in net_exit hook
  l2tp: exit_net cleanup check added
  nf_tables: exit_net cleanup check added
  nfnetlink_log: exit_net cleanup check added
  nfnetlink_gueue: exit_net cleanup check added
  x_tables: exit_net cleanup check added
  packet: exit_net cleanup check added
  phonet: exit_net cleanup check added
  sunrpc: exit_net cleanup check added

 drivers/net/geneve.c               |  3 +++
 drivers/net/ppp/ppp_generic.c      |  6 ++++++
 drivers/net/vxlan.c                |  7 +++++++
 fs/lockd/svc.c                     | 11 +++++++++++
 fs/nfs/blocklayout/rpc_pipefs.c    |  3 +++
 fs/nfs/client.c                    |  4 ++++
 fs/nfs_common/grace.c              |  4 +++-
 net/core/dev.c                     |  4 ++++
 net/core/fib_notifier.c            |  8 ++++++++
 net/core/fib_rules.c               |  8 ++++++++
 net/ipv4/netfilter/ipt_CLUSTERIP.c |  3 +++
 net/ipv6/xfrm6_tunnel.c            | 14 ++++++++++++++
 net/key/af_key.c                   |  4 +++-
 net/l2tp/l2tp_core.c               |  7 +++++++
 net/netfilter/nf_tables_api.c      | 11 +++++++++++
 net/netfilter/nfnetlink_log.c      |  7 +++++++
 net/netfilter/nfnetlink_queue.c    |  8 ++++++++
 net/netfilter/x_tables.c           | 12 ++++++++++++
 net/packet/af_packet.c             |  2 ++
 net/phonet/pn_dev.c                |  5 +++++
 net/sunrpc/sunrpc_syms.c           |  5 +++++
 21 files changed, 134 insertions(+), 2 deletions(-)