netdev - Re: [PATCH] netns: Don't receive new packets in a dead network namespace.

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Message-ID: <20080621005125.GA5711@martell.zuzino.mipt.ru>
Date:	Sat, 21 Jun 2008 04:51:25 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	den@...nvz.org, xemul@...nvz.org, dlezcano@...ibm.com,
	benjamin.thery@...l.net
Subject: Re: [PATCH] netns: Don't receive new packets in a dead network
	namespace.

On Fri, Jun 20, 2008 at 05:17:05PM -0700, Eric W. Biederman wrote:
> --- a/include/net/net_namespace.h
> +++ b/include/net/net_namespace.h
> @@ -95,6 +95,11 @@ extern struct list_head net_namespace_list;
>  #ifdef CONFIG_NET_NS
>  extern void __put_net(struct net *net);
>  
> +static inline int net_alive(struct net *net)
> +{
> +	return net && atomic_read(&net->count);
> +}

netns pointers are always valid, right?

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