[nf-next,v2,01/10] netfilter: make /proc/net/netfilter pernet

Now,only init net has directroy /proc/net/netfilter,
this patch makes this proc dentry pernet.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
---
 include/net/net_namespace.h   |  2 ++
 include/net/netns/netfilter.h | 11 +++++++++++
 net/netfilter/core.c          | 36 +++++++++++++++++++++++++++++++-----
 3 files changed, 44 insertions(+), 5 deletions(-)
 create mode 100644 include/net/netns/netfilter.h

On Mon, Mar 25, 2013 at 05:50:39PM +0800, Gao feng wrote:
> Now,only init net has directroy /proc/net/netfilter,
> this patch makes this proc dentry pernet.

Applied with minor glitch, see below:

> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
> ---
>  include/net/net_namespace.h   |  2 ++
>  include/net/netns/netfilter.h | 11 +++++++++++
>  net/netfilter/core.c          | 36 +++++++++++++++++++++++++++++++-----
>  3 files changed, 44 insertions(+), 5 deletions(-)
>  create mode 100644 include/net/netns/netfilter.h
> 
> diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
> index de644bc..b176978 100644
> --- a/include/net/net_namespace.h
> +++ b/include/net/net_namespace.h
> @@ -17,6 +17,7 @@
>  #include <net/netns/ipv6.h>
>  #include <net/netns/sctp.h>
>  #include <net/netns/dccp.h>
> +#include <net/netns/netfilter.h>
>  #include <net/netns/x_tables.h>
>  #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
>  #include <net/netns/conntrack.h>
> @@ -94,6 +95,7 @@ struct net {
>  	struct netns_dccp	dccp;
>  #endif
>  #ifdef CONFIG_NETFILTER
> +	struct netns_nf		nf;
>  	struct netns_xt		xt;
>  #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
>  	struct netns_ct		ct;
> diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h
> new file mode 100644
> index 0000000..248ca1c
> --- /dev/null
> +++ b/include/net/netns/netfilter.h
> @@ -0,0 +1,11 @@
> +#ifndef __NETNS_NETFILTER_H
> +#define __NETNS_NETFILTER_H
> +
> +#include <linux/proc_fs.h>
> +
> +struct netns_nf {
> +#if defined CONFIG_PROC_FS
> +	struct proc_dir_entry *proc_netfilter;
> +#endif
> +};
> +#endif
> diff --git a/net/netfilter/core.c b/net/netfilter/core.c
> index a9c488b..e054799 100644
> --- a/net/netfilter/core.c
> +++ b/net/netfilter/core.c
> @@ -281,6 +281,35 @@ struct proc_dir_entry *proc_net_netfilter;
>  EXPORT_SYMBOL(proc_net_netfilter);
>  #endif
>  
> +static int __net_init netfilter_net_init(struct net *net)
> +{
> +#ifdef CONFIG_PROC_FS
> +	net->nf.proc_netfilter = proc_net_mkdir(net,
> +						"netfilter",
> +						net->proc_net);
> +	if (net_eq(net, &init_net)) {
> +		if (!net->nf.proc_netfilter)
> +			panic("cannot create netfilter proc entry");

Moved this panic() to netfilter_init and it just returns -ENOMEM.

> +		else
> +			proc_net_netfilter = net->nf.proc_netfilter;
> +	} else if (!net->nf.proc_netfilter) {
> +		pr_err("cannot create netfilter proc entry");
> +		return -ENOMEM;
> +	}
> +#endif
> +	return 0;
> +}
> +
> +static void __net_exit netfilter_net_exit(struct net *net)
> +{
> +	remove_proc_entry("netfilter", net->proc_net);
> +}
> +
> +static struct pernet_operations netfilter_net_ops = {
> +	.init = netfilter_net_init,
> +	.exit = netfilter_net_exit,
> +};
> +
>  void __init netfilter_init(void)
>  {
>  	int i, h;
> @@ -289,11 +318,8 @@ void __init netfilter_init(void)
>  			INIT_LIST_HEAD(&nf_hooks[i][h]);
>  	}
>  
> -#ifdef CONFIG_PROC_FS
> -	proc_net_netfilter = proc_mkdir("netfilter", init_net.proc_net);
> -	if (!proc_net_netfilter)
> -		panic("cannot create netfilter proc entry");
> -#endif
> +	if (register_pernet_subsys(&netfilter_net_ops) < 0)
> +		return;
>  
>  	if (netfilter_log_init() < 0)
>  		panic("cannot initialize nf_log");
> -- 
> 1.7.11.7
> 
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