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

[Daniel Lezcano]

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 ?