br_netfilter: add struct netns_brnf

This adds struct netns_brnf in preparation for per-network-namespace
br_netfilter settings. The individual br_netfilter sysctl options are moved
into a central place in struct net. The struct is only included when
the CONFIG_BRIDGE_NETFILTER kconfig option is enabled in the kernel.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
3 files changed