From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Christian Brauner <christian@brauner.io>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
davem@davemloft.net, netdev@vger.kernel.org,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
bridge@lists.linux-foundation.org, tyhicks@canonical.com,
kadlec@blackhole.kfki.hu, fw@strlen.de,
roopa@cumulusnetworks.com, nikolay@cumulusnetworks.com,
linux-kernel@vger.kernel.org, richardrose@google.com,
vapier@chromium.org, bhthompson@google.com,
smbarber@chromium.org, joelhockey@chromium.org,
ueberall@themenzentrisch.de
Subject: Re: [PATCH RESEND net-next 1/2] br_netfilter: add struct netns_brnf
Date: Fri, 7 Jun 2019 16:28:58 +0200 [thread overview]
Message-ID: <20190607142858.vgkljqohn34rxhe2@salvia> (raw)
In-Reply-To: <20190607132516.q3zwmzrynvqo7mzn@brauner.io>
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.
next prev parent reply other threads:[~2019-06-07 14:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 11:41 [PATCH RESEND net-next 0/2] br_netfilter: enable in non-initial netns Christian Brauner
2019-06-06 11:41 ` [PATCH RESEND net-next 1/2] br_netfilter: add struct netns_brnf Christian Brauner
2019-06-06 15:14 ` Stephen Hemminger
2019-06-06 15:19 ` Christian Brauner
2019-06-06 16:30 ` Pablo Neira Ayuso
2019-06-07 13:25 ` Christian Brauner
2019-06-07 14:28 ` Pablo Neira Ayuso [this message]
2019-06-07 14:43 ` Pablo Neira Ayuso
2019-06-09 15:44 ` Christian Brauner
2019-06-06 11:41 ` [PATCH RESEND net-next 2/2] br_netfilter: namespace bridge netfilter sysctls Christian Brauner
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