[Devel] [PATCH 10/12] L2 network namespace: playing with pass-through device

[Dmitry Mishin]

On Tuesday 12 December 2006 17:10, Daniel Lezcano wrote:
> Dmitry Mishin wrote:
> > On Tuesday 12 December 2006 16:59, Daniel Lezcano wrote:
> >> Dmitry Mishin wrote:
> >>> Temporary code to debug and play with pass-through device.
> >>> Create device pair by
> >>> 	modprobe veth
> >>>         echo 'add veth1 0:1:2:3:4:1 eth0 0:1:2:3:4:2' >/proc/net/veth_ctl
> >>> and your shell will appear into a new namespace with `eth0' device.
> >>> Configure device in this namespace
> >>>         ip l s eth0 up
> >>>         ip a a 1.2.3.4/24 dev eth0
> >>> and in the root namespace
> >>>         ip l s veth1 up
> >>>         ip a a 1.2.3.1/24 dev veth1
> >>> to establish a communication channel between root namespace and the newly
> >>> created one.
> >>>
> >>> Code is done by Andrey Savochkin and ported by me over Cedric'c patchset
> >>>
> >>> Signed-off-by: Dmitry Mishin <dim at openvz.org>
> >>>
> >> [ ... ]
> >>
> >>> --- linux-2.6.19-rc6-mm2.orig/include/linux/net_namespace.h
> >>> +++ linux-2.6.19-rc6-mm2/include/linux/net_namespace.h
> >>> @@ -24,6 +24,9 @@ struct net_namespace {
> >>>  	int			fib4_trie_last_dflt;
> >>>  #endif
> >>>  	unsigned int		hash;
> >>> +	struct net_namespace	*parent;
> >>> +	struct list_head	child_list, sibling_list;
> >>> +	unsigned int		id;
> >>>  };
> >> Why do yo need to have a child list and sibling list ?
> > Because of the level2<->level3 hierarchy, for example.
> 
> This hierarchy doesn't exist with ns->parent ? Do you have an example 
> when the hierarchy should be used ? I mean when we need to browse from 
> l2 -> l3 ?
For example, to check that new ifaddr is already used by child l3 namespace.

-- 
Thanks,
Dmitry.