On Mon, 2016-01-04 at 11:47 -0800, Tom Herbert wrote:
> On Mon, Jan 4, 2016 at 10:45 AM, Saurabh Mohan
> <saur...@cplanenetworks.com> wrote:
> >
> > This patch enchances a tunnel interface, like gre, to have the tunnel
> > encap/decap be in the context of a network namespace that is different from
> > the namespace of the tunnel interface.
> >
> > From userspace this feature may be configured using the new 'onetns'
> > keyword:
> > ip netns exec custa ip link add dev tun1 type gre local 10.0.0.1 \
> > remote 10.0.0.2 onetns outside
> >
> > In the above example the tunnel would be in the 'custa' namespace and the
> > tunnel endpoints would be in the 'outside' namespace.
> >
> > Also, proposing the use of netns name 'global' to specify the global
> > namespace.
> >
> > If this patch set is accepted then I will add support for other tunnels as
> > well.
> >
> This might be interesting. Can you please ad a 0/n patch that
> describes the motivation for this, in particular I would like to know
> if this has a positive impact on ns performance if somehow we are
> eliminating indirection.
[]
> > diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
[]
> > @@ -3,6 +3,7 @@
> >
> > #include
> > #include
> > +#include
> >
> >
> > #define SIOCGETTUNNEL (SIOCDEVPRIVATE + 0)
> > @@ -27,6 +28,14 @@
> > #define GRE_FLAGS __cpu_to_be16(0x00F8)
> > #define GRE_VERSION __cpu_to_be16(0x0007)
> >
> > +struct o_netns_parm {
> > + __u8 o_netns_flag;
> > + __u32 o_netns_fd;
> > + char netns[NAME_MAX];
> > +};
Trivia:
It could eliminate a few padding bytes if the
o_netns_fd and o_netns_flag fields were reversed.
and netns[NAME_MAX] is normally netns[NAME_MAX + 1]
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