netdev - [RFC 1/3] MPEG2/TS drop analyzer file: xt

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Message-ID: <Pine.LNX.4.64.1010191624300.19390@ask.diku.dk>
Date:	Tue, 19 Oct 2010 16:25:24 +0200 (CEST)
From:	Jesper Dangaard Brouer <hawk@...u.dk>
To:	Netfilter Developers <netfilter-devel@...r.kernel.org>
Cc:	paulmck@...ux.vnet.ibm.com, Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: [RFC 1/3] MPEG2/TS drop analyzer file: xt_mp2t.h

/*
  * Header file for MPEG2 TS match extension "mp2t" for Xtables.
  *
  * Copyright (c) Jesper Dangaard Brouer <jdb@...x.dk>, 2009+
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License; either
  * version 2 of the License, or any later version, as published by the
  * Free Software Foundation.
  *
  */
#ifndef _LINUX_NETFILTER_XT_MP2T_MATCH_H
#define _LINUX_NETFILTER_XT_MP2T_MATCH_H 1

#define XT_MODULE_NAME		"xt_mp2t"
#define XT_MODULE_VERSION	"0.2.1-devel"
#define XT_MODULE_RELDATE	"Sep 15, 2010"
#define PFX			XT_MODULE_NAME ": "

static char version[] =
 	XT_MODULE_NAME ".c:v" XT_MODULE_VERSION " (" XT_MODULE_RELDATE ")";

enum {
 	XT_MP2T_DETECT_DROP = 1 << 0,
 	XT_MP2T_MAX_STREAMS = 1 << 1,
 	XT_MP2T_PARAM_NAME  = 1 << 2,
};

/* Details of this hash structure is hidden in kernel space xt_mp2t.c */
struct xt_rule_mp2t_conn_htable;

struct mp2t_cfg {

 	/* Hash table setup */
 	u_int32_t size;		/* how many hash buckets */
 	u_int32_t max;		/* max number of entries */
 	u_int32_t max_list;	/* warn if list searches exceed this number */
};

struct xt_mp2t_mtinfo {
 	__u16 flags;

 	/* FIXME:

 	   I need to fix the problem, where I have to reallocated data
 	   each time a single rule change occur.

 	   The idea with rule_name and rule_id is that the name is
 	   optional, simply to provide a name in /proc/, the rule_id
 	   is the real lookup-key in the internal kernel list of the
 	   rules associated dynamic-allocated-data.

 	 */
 	char rule_name[IFNAMSIZ];

 	struct mp2t_cfg cfg;

 	/** Below used internally by the kernel **/
 	__u32 rule_id;

 	/* Hash table pointer */
 	struct xt_rule_mp2t_conn_htable *hinfo __attribute__((aligned(8)));
};

#endif /* _LINUX_NETFILTER_XT_MP2T_MATCH_H */
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