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SubjectRe: [PATCH RESEND net-next 1/2] br_netfilter: add struct netns_brnf
On Fri, Jun 07, 2019 at 03:25:16PM +0200, Christian Brauner wrote:
> On Thu, Jun 06, 2019 at 06:30:35PM +0200, Pablo Neira Ayuso wrote:
> > On Thu, Jun 06, 2019 at 05:19:39PM +0200, Christian Brauner wrote:
> > > On Thu, Jun 06, 2019 at 08:14:40AM -0700, Stephen Hemminger wrote:
> > > > On Thu, 6 Jun 2019 13:41:41 +0200
> > > > Christian Brauner <christian@brauner.io> wrote:
> > > >
> > > > > +struct netns_brnf {
> > > > > +#ifdef CONFIG_SYSCTL
> > > > > + struct ctl_table_header *ctl_hdr;
> > > > > +#endif
> > > > > +
> > > > > + /* default value is 1 */
> > > > > + int call_iptables;
> > > > > + int call_ip6tables;
> > > > > + int call_arptables;
> > > > > +
> > > > > + /* default value is 0 */
> > > > > + int filter_vlan_tagged;
> > > > > + int filter_pppoe_tagged;
> > > > > + int pass_vlan_indev;
> > > > > +};
> > > >
> > > > Do you really need to waste four bytes for each
> > > > flag value. If you use a u8 that would work just as well.
> > >
> > > I think we had discussed something like this but the problem why we
> > > can't do this stems from how the sysctl-table stuff is implemented.
> > > I distinctly remember that it couldn't be done with a flag due to that.
> >
> > Could you define a pernet_operations object? I mean, define the id and size
> > fields, then pass it to register_pernet_subsys() for registration.
> > Similar to what we do in net/ipv4/netfilter/ipt_CLUSTER.c, see
> > clusterip_net_ops and clusterip_pernet() for instance.
>
> Hm, I don't think that would work. The sysctls for br_netfilter are
> located in /proc/sys/net/bridge under /proc/sys/net which is tightly
> integrated with the sysctls infrastructure for all of net/ and all the
> folder underneath it including "core", "ipv4" and "ipv6".
> I don't think creating and managing files manually in /proc/sys/net is
> going to fly. It also doesn't seem very wise from a consistency and
> complexity pov. I'm also not sure if this would work at all wrt to file
> creation and reference counting if there are two different ways of
> managing them in the same subfolder...
> (clusterip creates files manually underneath /proc/net which probably is
> the reason why it gets away with it.)

br_netfilter is now a module, and br_netfilter_hooks.c is part of it
IIRC, this file registers these sysctl entries from the module __init
path.

It would be a matter of adding a new .init callback to the existing
brnf_net_ops object in br_netfilter_hooks.c. Then, call
register_net_sysctl() from this .init callback to register the sysctl
entries per netns.

There is already a brnf_net area that you can reuse for this purpose,
to place these pernetns flags...

struct brnf_net {
bool enabled;
};

which is going to be glad to have more fields (under the #ifdef
CONFIG_SYSCTL) there.

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