netdev - Re: [PATCH net-next 1/2] netfilter: xt_bpf: don't include linux/filter.h from uapi header

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Date:	Tue, 29 Jul 2014 11:43:57 -0400
From:	Willem de Bruijn <willemb@...gle.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	netfilter-devel <netfilter-devel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Daniel Borkmann <dborkman@...hat.com>, keescook@...omium.org
Subject: Re: [PATCH net-next 1/2] netfilter: xt_bpf: don't include
 linux/filter.h from uapi header

> In e6f30c7 ("netfilter: x_tables: add xt_bpf match"), the internal
> linux/filter.h header slipped through in the user exposed xt_bpf.h
> header as included file.

is that true? #include <linux/filter.h> should include
include/uapi/linux/filter.h in userspace builds.

>
> +struct sk_filter;
> +
>  struct xt_bpf_info {
>         __u16 bpf_program_num_elem;
>         struct sock_filter bpf_program[XT_BPF_MAX_NUM_INSTR];

I think include/uapi/linux/filter.h is still needed for the definition
of struct sock_filter.

The uapi file does not declare sk_filter, so we do need to add the
forward declaration. Thanks, Pablo.
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