xt_mp2t: initial import

This is my iptables match module for analyzing IPTV MPEG2/TS streams.
Currently it only detects dropped packets, but I want to extend it for
analyzing jitter and bursts.

extensions/xt_mp2t.h

@@ -0,0 +1,66 @@
+/*
+ * Header file for MPEG2 TS match extension "mp2t" for Xtables.
+ *
+ * Copyright (c) Jesper Dangaard Brouer <jdb@comx.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 */