net: net_cls: move cgroupfs classid handling into core

Zefan Li requested [1] to perform the following cleanup/refactoring:

- Split cgroupfs classid handling into net core to better express a
  possible more generic use.

- Disable module support for cgroupfs bits as the majority of other
  cgroupfs subsystems do not have that, and seems to be not wished
  from cgroup side. Zefan probably might want to follow-up for netprio
  later on.

- By this, code can be further reduced which previously took care of
  functionality built when compiled as module.

cgroupfs bits are being placed under net/core/netclassid_cgroup.c, so
that we are consistent with {netclassid,netprio}_cgroup naming that is
under net/core/ as suggested by Zefan.

No change in functionality, but only code refactoring that is being
done here.

 [1] http://patchwork.ozlabs.org/patch/304825/

Suggested-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: Thomas Graf <tgraf@suug.ch>
Cc: cgroups@vger.kernel.org
Acked-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/Kconfig b/net/Kconfig
index d334678c0bd8..7da10b830d70 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -245,6 +245,13 @@ config NETPRIO_CGROUP
           Cgroup subsystem for use in assigning processes to network priorities on
           a per-interface basis
 
+config CGROUP_NET_CLASSID
+        boolean "Network classid cgroup"
+        depends on CGROUPS
+        ---help---
+          Cgroup subsystem for use as general purpose socket classid marker that is
+          being used in cls_cgroup and for netfilter matching.
+
 config NET_RX_BUSY_POLL
         boolean
         default y