Re: [PATCH nf-next] netfilter: ebtables: do not hook tables by default

[Pablo Neira Ayuso <pablo@netfilter.org>]

On Fri, Jul 23, 2021 at 03:18:01PM +0200, Florian Westphal wrote:
> If any of these modules is loaded, hooks get registered in all netns:
> 
> Before: 'unshare -n nft list hooks' shows:
> family bridge hook prerouting {
> 	-2147483648 ebt_broute
> 	-0000000300 ebt_nat_hook
> }
> family bridge hook input {
> 	-0000000200 ebt_filter_hook
> }
> family bridge hook forward {
> 	-0000000200 ebt_filter_hook
> }
> family bridge hook output {
> 	+0000000100 ebt_nat_hook
> 	+0000000200 ebt_filter_hook
> }
> family bridge hook postrouting {
> 	+0000000300 ebt_nat_hook
> }
> 
> This adds 'template 'tables' for ebtables.
> 
> Each ebtable_foo registers the table as a template, with an init function
> that gets called once the first get/setsockopt call is made.
> 
> ebtables core then searches the (per netns) list of tables.
> If no table is found, it searches the list of templates instead.
> If a template entry exists, the init function is called which will
> enable the table and register the hooks (so packets are diverted
> to the table).
> 
> If no entry is found in the template list, request_module is called.
> 
> After this, hook registration is delayed until the 'ebtables'
> (set/getsockopt) request is made for a given table and will only
> happen in the specific namespace.

Applied, thanks.