netdev - Re: [PATCH 9/9] netfilter: implement xt

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Date:	Sat, 21 Nov 2015 17:56:06 +0100
From:	Florian Westphal <fw@...len.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	davem@...emloft.net, pablo@...filter.org, kaber@...sh.net,
	kadlec@...ckhole.kfki.hu, daniel@...earbox.net,
	daniel.wagner@...-carit.de, nhorman@...driver.co,
	lizefan@...wei.com, hannes@...xchg.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com, ninasc@...com,
	Neil Horman <nhorman@...driver.com>,
	Jan Engelhardt <jengelh@...i.de>
Subject: Re: [PATCH 9/9] netfilter: implement xt_cgroup cgroup2 path match

Tejun Heo <tj@...nel.org> wrote:
> This patch implements xt_cgroup path match which matches cgroup2
> membership of the associated socket.  The match is recursive and
> invertible.
> 
> For rationales on introducing another cgroup based match, please refer
> to a preceding commit "sock, cgroup: add sock->sk_cgroup".
> 
> v3: Folded into xt_cgroup as a new revision interface as suggested by
>     Pablo.
> 
> v2: Included linux/limits.h from xt_cgroup2.h for PATH_MAX.  Added
>     explicit alignment to the priv field.  Both suggested by Jan.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Daniel Wagner <daniel.wagner@...-carit.de>
> CC: Neil Horman <nhorman@...driver.com>
> Cc: Jan Engelhardt <jengelh@...i.de>
> Cc: Pablo Neira Ayuso <pablo@...filter.org>
> ---
>  include/uapi/linux/netfilter/xt_cgroup.h | 13 ++++++
>  net/netfilter/xt_cgroup.c                | 69 ++++++++++++++++++++++++++++++++
>  2 files changed, 82 insertions(+)
> 
> diff --git a/include/uapi/linux/netfilter/xt_cgroup.h b/include/uapi/linux/netfilter/xt_cgroup.h
> index 577c9e0..1e4b37b 100644
> --- a/include/uapi/linux/netfilter/xt_cgroup.h
> +++ b/include/uapi/linux/netfilter/xt_cgroup.h
> @@ -2,10 +2,23 @@
>  #define _UAPI_XT_CGROUP_H
>  
>  #include <linux/types.h>
> +#include <linux/limits.h>
>  
>  struct xt_cgroup_info_v0 {
>  	__u32 id;
>  	__u32 invert;
>  };
>  
> +struct xt_cgroup_info_v1 {
> +	__u8		has_path;
> +	__u8		has_classid;
> +	__u8		invert_path;
> +	__u8		invert_classid;
> +	char		path[PATH_MAX];
> +	__u32		classid;
> +
> +	/* kernel internal data */
> +	void		*priv __attribute__((aligned(8)));
> +};

Ahem.  Am I reading this right? This struct is > 4k in size?
If so -- Ugh.  Does sizeof(path) really have to be PATH_MAX?

Thanks!
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