Index: linux-2.6.23.1/include/linux/netfilter_ipv4/ipt_ipp2p.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23.1/include/linux/netfilter_ipv4/ipt_ipp2p.h	2007-11-19 18:22:19.000000000 -0600
@@ -0,0 +1,31 @@
+#ifndef __IPT_IPP2P_H
+#define __IPT_IPP2P_H
+#define IPP2P_VERSION "0.8.1_rc1"
+
+struct ipt_p2p_info {
+    int cmd;
+    int debug;
+};
+
+#endif //__IPT_IPP2P_H
+
+#define SHORT_HAND_IPP2P	1 /* --ipp2p switch*/
+//#define SHORT_HAND_DATA		4 /* --ipp2p-data switch*/
+#define SHORT_HAND_NONE		5 /* no short hand*/
+
+#define IPP2P_EDK		(1 << 1)
+#define IPP2P_DATA_KAZAA	(1 << 2)
+#define IPP2P_DATA_EDK		(1 << 3)
+#define IPP2P_DATA_DC		(1 << 4)
+#define IPP2P_DC		(1 << 5)
+#define IPP2P_DATA_GNU		(1 << 6)
+#define IPP2P_GNU		(1 << 7)
+#define IPP2P_KAZAA		(1 << 8)
+#define IPP2P_BIT		(1 << 9)
+#define IPP2P_APPLE		(1 << 10)
+#define IPP2P_SOUL		(1 << 11)
+#define IPP2P_WINMX		(1 << 12)
+#define IPP2P_ARES		(1 << 13)
+#define IPP2P_MUTE		(1 << 14)
+#define IPP2P_WASTE		(1 << 15)
+#define IPP2P_XDCC		(1 << 16)
Index: linux-2.6.23.1/net/ipv4/netfilter/ipt_ipp2p.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23.1/net/ipv4/netfilter/ipt_ipp2p.c	2007-11-19 18:22:19.000000000 -0600
@@ -0,0 +1,856 @@
+#if defined(MODVERSIONS)
+#include <linux/modversions.h>
+#endif
+#include <linux/module.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/version.h>
+#include <linux/netfilter_ipv4/ipt_ipp2p.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+
+#define get_u8(X,O)  (*(__u8 *)(X + O))
+#define get_u16(X,O)  (*(__u16 *)(X + O))
+#define get_u32(X,O)  (*(__u32 *)(X + O))
+
+MODULE_AUTHOR("Eicke Friedrich/Klaus Degner <ipp2p@ipp2p.org>");
+MODULE_DESCRIPTION("An extension to iptables to identify P2P traffic.");
+MODULE_LICENSE("GPL");
+
+
+/*Search for UDP eDonkey/eMule/Kad commands*/
+int
+udp_search_edk (unsigned char *haystack, int packet_len)
+{
+    unsigned char *t = haystack;
+    t += 8;
+
+	switch (t[0]) {
+		case 0xe3:
+		{	/*edonkey*/
+			switch (t[1])
+			{
+				/* client -> server status request */
+				case 0x96:
+					if (packet_len == 14) return ((IPP2P_EDK * 100) + 50);
+					break;
+				/* server -> client status request */
+				case 0x97: if (packet_len == 42) return ((IPP2P_EDK * 100) + 51);
+					break;
+						/* server description request */
+						/* e3 2a ff f0 .. | size == 6 */
+				case 0xa2: if ( (packet_len == 14) && ( get_u16(t,2) == __constant_htons(0xfff0) ) ) return ((IPP2P_EDK * 100) + 52);
+					break;
+						/* server description response */
+						/* e3 a3 ff f0 ..  | size > 40 && size < 200 */
+				//case 0xa3: return ((IPP2P_EDK * 100) + 53);
+				//	break;
+				case 0x9a: if (packet_len==26) return ((IPP2P_EDK * 100) + 54);
+					break;
+
+				case 0x92: if (packet_len==18) return ((IPP2P_EDK * 100) + 55);
+					break;
+			}
+			break;
+		}
+		case 0xe4:
+		{
+			switch (t[1])
+			{
+						/* e4 20 .. | size == 43 */
+				case 0x20: if ((packet_len == 43) && (t[2] != 0x00) && (t[34] != 0x00)) return ((IPP2P_EDK * 100) + 60);
+					break;
+						/* e4 00 .. 00 | size == 35 ? */
+				case 0x00: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 61);
+					break;
+						/* e4 10 .. 00 | size == 35 ? */
+				case 0x10: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 62);
+					break;
+						/* e4 18 .. 00 | size == 35 ? */
+				case 0x18: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 63);
+					break;
+						/* e4 52 .. | size = 44 */
+				case 0x52: if (packet_len == 44 ) return ((IPP2P_EDK * 100) + 64);
+					break;
+						/* e4 58 .. | size == 6 */
+				case 0x58: if (packet_len == 14 ) return ((IPP2P_EDK * 100) + 65);
+					break;
+						/* e4 59 .. | size == 2 */
+				case 0x59: if (packet_len == 10 )return ((IPP2P_EDK * 100) + 66);
+					break;
+					/* e4 28 .. | packet_len == 52,77,102,127... */
+				case 0x28: if (((packet_len-52) % 25) == 0) return ((IPP2P_EDK * 100) + 67);
+					break;
+					/* e4 50 xx xx | size == 4 */
+				case 0x50: if (packet_len == 12) return ((IPP2P_EDK * 100) + 68);
+					break;
+					/* e4 40 xx xx | size == 48 */
+				case 0x40: if (packet_len == 56) return ((IPP2P_EDK * 100) + 69);
+					break;
+			}
+			break;
+		}
+	} /* end of switch (t[0]) */
+    return 0;
+}/*udp_search_edk*/
+
+
+/*Search for UDP Gnutella commands*/
+int
+udp_search_gnu (unsigned char *haystack, int packet_len)
+{
+    unsigned char *t = haystack;
+    t += 8;
+
+    if (memcmp(t, "GND", 3) == 0) return ((IPP2P_GNU * 100) + 51);
+    if (memcmp(t, "GNUTELLA ", 9) == 0) return ((IPP2P_GNU * 100) + 52);
+    return 0;
+}/*udp_search_gnu*/
+
+
+/*Search for UDP KaZaA commands*/
+int
+udp_search_kazaa (unsigned char *haystack, int packet_len)
+{
+    unsigned char *t = haystack;
+
+    if (t[packet_len-1] == 0x00){
+	t += (packet_len - 6);
+	if (memcmp(t, "KaZaA", 5) == 0) return (IPP2P_KAZAA * 100 +50);
+    }
+
+    return 0;
+}/*udp_search_kazaa*/
+
+/*Search for UDP DirectConnect commands*/
+int
+udp_search_directconnect (unsigned char *haystack, int packet_len)
+{
+    unsigned char *t = haystack;
+    if ((*(t + 8) == 0x24) && (*(t + packet_len - 1) == 0x7c)) {
+    	t+=8;
+    	if (memcmp(t, "SR ", 3) == 0)	 		return ((IPP2P_DC * 100) + 60);
+    	if (memcmp(t, "Ping ", 5) == 0)	 		return ((IPP2P_DC * 100) + 61);
+    }
+    return 0;
+}/*udp_search_directconnect*/
+
+
+
+/*Search for UDP BitTorrent commands*/
+int
+udp_search_bit (unsigned char *haystack, int packet_len)
+{
+	switch(packet_len)
+	{
+		case 24:
+			/* ^ 00 00 04 17 27 10 19 80 */
+			if ((ntohl(get_u32(haystack, 8)) == 0x00000417) && (ntohl(get_u32(haystack, 12)) == 0x27101980))
+				return (IPP2P_BIT * 100 + 50);
+			break;
+		case 44:
+			if (get_u32(haystack, 16) == __constant_htonl(0x00000400) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
+				return (IPP2P_BIT * 100 + 51);
+			if (get_u32(haystack, 16) == __constant_htonl(0x00000400))
+				return (IPP2P_BIT * 100 + 61);
+			break;
+		case 65:
+			if (get_u32(haystack, 16) == __constant_htonl(0x00000404) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
+				return (IPP2P_BIT * 100 + 52);
+			if (get_u32(haystack, 16) == __constant_htonl(0x00000404))
+				return (IPP2P_BIT * 100 + 62);
+			break;
+		case 67:
+			if (get_u32(haystack, 16) == __constant_htonl(0x00000406) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
+				return (IPP2P_BIT * 100 + 53);
+			if (get_u32(haystack, 16) == __constant_htonl(0x00000406))
+				return (IPP2P_BIT * 100 + 63);
+			break;
+		case 211:
+			if (get_u32(haystack, 8) == __constant_htonl(0x00000405))
+				return (IPP2P_BIT * 100 + 54);
+			break;
+		case 29:
+			if ((get_u32(haystack, 8) == __constant_htonl(0x00000401)))
+				return (IPP2P_BIT * 100 + 55);
+			break;
+		case 52:
+			if (get_u32(haystack,8)  == __constant_htonl(0x00000827) &&
+			get_u32(haystack,12) == __constant_htonl(0x37502950))
+				return (IPP2P_BIT * 100 + 80);
+			break;
+		default:
+			/* this packet does not have a constant size */
+			if (packet_len >= 40 && get_u32(haystack, 16) == __constant_htonl(0x00000402) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
+				return (IPP2P_BIT * 100 + 56);
+			break;
+	}
+
+	/* some extra-bitcomet rules:
+	* "d1:" [a|r] "d2:id20:"
+	*/
+	if (packet_len > 30 && get_u8(haystack, 8) == 'd' && get_u8(haystack, 9) == '1' && get_u8(haystack, 10) == ':' )
+	{
+		if (get_u8(haystack, 11) == 'a' || get_u8(haystack, 11) == 'r')
+		{
+			if (memcmp(haystack+12,"d2:id20:",8)==0)
+				return (IPP2P_BIT * 100 + 57);
+		}
+	}
+
+#if 0
+	/* bitlord rules */
+	/* packetlen must be bigger than 40 */
+	/* first 4 bytes are zero */
+	if (packet_len > 40 && get_u32(haystack, 8) == 0x00000000)
+	{
+		/* first rule: 00 00 00 00 01 00 00 xx xx xx xx 00 00 00 00*/
+		if (get_u32(haystack, 12) == 0x00000000 &&
+		    get_u32(haystack, 16) == 0x00010000 &&
+		    get_u32(haystack, 24) == 0x00000000 )
+			return (IPP2P_BIT * 100 + 71);
+
+		/* 00 01 00 00 0d 00 00 xx xx xx xx 00 00 00 00*/
+		if (get_u32(haystack, 12) == 0x00000001 &&
+		    get_u32(haystack, 16) == 0x000d0000 &&
+		    get_u32(haystack, 24) == 0x00000000 )
+			return (IPP2P_BIT * 100 + 71);
+
+
+	}
+#endif
+
+    return 0;
+}/*udp_search_bit*/
+
+
+
+/*Search for Ares commands*/
+//#define IPP2P_DEBUG_ARES
+int
+search_ares (const unsigned char *payload, const u16 plen)
+//int search_ares (unsigned char *haystack, int packet_len, int head_len)
+{
+//	const unsigned char *t = haystack + head_len;
+
+	/* all ares packets start with  */
+	if (payload[1] == 0 && (plen - payload[0]) == 3)
+	{
+		switch (payload[2])
+		{
+			case 0x5a:
+				/* ares connect */
+				if ( plen == 6 && payload[5] == 0x05 ) return ((IPP2P_ARES * 100) + 1);
+				break;
+			case 0x09:
+				/* ares search, min 3 chars --> 14 bytes
+				 * lets define a search can be up to 30 chars --> max 34 bytes
+				 */
+				if ( plen >= 14 && plen <= 34 ) return ((IPP2P_ARES * 100) + 1);
+				break;
+#ifdef IPP2P_DEBUG_ARES
+			default:
+			printk(KERN_DEBUG "Unknown Ares command %x recognized, len: %u \n", (unsigned int) payload[2],plen);
+#endif /* IPP2P_DEBUG_ARES */
+		}
+	}
+
+#if 0
+	/* found connect packet: 03 00 5a 04 03 05 */
+	/* new version ares 1.8: 03 00 5a xx xx 05 */
+    if ((plen) == 6){	/* possible connect command*/
+	if ((payload[0] == 0x03) && (payload[1] == 0x00) && (payload[2] == 0x5a) && (payload[5] == 0x05))
+	    return ((IPP2P_ARES * 100) + 1);
+    }
+    if ((plen) == 60){	/* possible download command*/
+	if ((payload[59] == 0x0a) && (payload[58] == 0x0a)){
+	    if (memcmp(t, "PUSH SHA1:", 10) == 0) /* found download command */
+	    	return ((IPP2P_ARES * 100) + 2);
+	}
+    }
+#endif
+
+    return 0;
+} /*search_ares*/
+
+/*Search for SoulSeek commands*/
+int
+search_soul (const unsigned char *payload, const u16 plen)
+{
+//#define IPP2P_DEBUG_SOUL
+    /* match: xx xx xx xx | xx = sizeof(payload) - 4 */
+    if (get_u32(payload, 0) == (plen - 4)){
+	const __u32 m=get_u32(payload, 4);
+	/* match 00 yy yy 00, yy can be everything */
+        if ( get_u8(payload, 4) == 0x00 && get_u8(payload, 7) == 0x00 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+	printk(KERN_DEBUG "0: Soulseek command 0x%x recognized\n",get_u32(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 1);
+	}
+
+        /* next match: 01 yy 00 00 | yy can be everything */
+        if ( get_u8(payload, 4) == 0x01 && get_u16(payload, 6) == 0x0000 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+	printk(KERN_DEBUG "1: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 2);
+	}
+
+	/* other soulseek commandos are: 1-5,7,9,13-18,22,23,26,28,35-37,40-46,50,51,60,62-69,91,92,1001 */
+	/* try to do this in an intelligent way */
+	/* get all small commandos */
+	switch(m)
+	{
+		case 7:
+		case 9:
+		case 22:
+		case 23:
+		case 26:
+		case 28:
+		case 50:
+		case 51:
+		case 60:
+		case 91:
+		case 92:
+		case 1001:
+#ifdef IPP2P_DEBUG_SOUL
+		printk(KERN_DEBUG "2: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 3);
+	}
+
+	if (m > 0 && m < 6 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+		printk(KERN_DEBUG "3: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 4);
+	}
+	if (m > 12 && m < 19 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+		printk(KERN_DEBUG "4: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 5);
+	}
+
+	if (m > 34 && m < 38 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+		printk(KERN_DEBUG "5: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 6);
+	}
+
+	if (m > 39 && m < 47 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+		printk(KERN_DEBUG "6: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 7);
+	}
+
+	if (m > 61 && m < 70 )
+	{
+#ifdef IPP2P_DEBUG_SOUL
+		printk(KERN_DEBUG "7: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
+#endif /* IPP2P_DEBUG_SOUL */
+		return ((IPP2P_SOUL * 100) + 8);
+	}
+
+#ifdef IPP2P_DEBUG_SOUL
+	printk(KERN_DEBUG "unknown SOULSEEK command: 0x%x, first 16 bit: 0x%x, first 8 bit: 0x%x ,soulseek ???\n",get_u32(payload, 4),get_u16(payload, 4) >> 16,get_u8(payload, 4) >> 24);
+#endif /* IPP2P_DEBUG_SOUL */
+    }
+
+	/* match 14 00 00 00 01 yy 00 00 00 STRING(YY) 01 00 00 00 00 46|50 00 00 00 00 */
+	/* without size at the beginning !!! */
+	if ( get_u32(payload, 0) == 0x14 && get_u8(payload, 4) == 0x01 )
+	{
+		__u32 y=get_u32(payload, 5);
+		/* we need 19 chars + string */
+		if ( (y + 19) <= (plen) )
+		{
+			const unsigned char *w=payload+9+y;
+			if (get_u32(w, 0) == 0x01 && ( get_u16(w, 4) == 0x4600 || get_u16(w, 4) == 0x5000) && get_u32(w, 6) == 0x00);
+#ifdef IPP2P_DEBUG_SOUL
+	    		printk(KERN_DEBUG "Soulssek special client command recognized\n");
+#endif /* IPP2P_DEBUG_SOUL */
+	    		return ((IPP2P_SOUL * 100) + 9);
+		}
+	}
+    return 0;
+}
+
+
+/*Search for WinMX commands*/
+int
+search_winmx (const unsigned char *payload, const u16 plen)
+{
+//#define IPP2P_DEBUG_WINMX
+    if (((plen) == 4) && (memcmp(payload, "SEND", 4) == 0))  return ((IPP2P_WINMX * 100) + 1);
+    if (((plen) == 3) && (memcmp(payload, "GET", 3) == 0))  return ((IPP2P_WINMX * 100) + 2);
+    //if (packet_len < (head_len + 10)) return 0;
+    if (plen < 10) return 0;
+
+    if ((memcmp(payload, "SEND", 4) == 0) || (memcmp(payload, "GET", 3) == 0)){
+        u16 c=4;
+        const u16 end=plen-2;
+        u8 count=0;
+        while (c < end)
+        {
+        	if (payload[c]== 0x20 && payload[c+1] == 0x22)
+        	{
+        		c++;
+        		count++;
+        		if (count>=2) return ((IPP2P_WINMX * 100) + 3);
+        	}
+        	c++;
+        }
+    }
+
+    if ( plen == 149 && payload[0] == '8' )
+    {
+#ifdef IPP2P_DEBUG_WINMX
+    	printk(KERN_INFO "maybe WinMX\n");
+#endif
+    	if (get_u32(payload,17) == 0 && get_u32(payload,21) == 0 && get_u32(payload,25) == 0 &&
+//    	    get_u32(payload,33) == __constant_htonl(0x71182b1a) && get_u32(payload,37) == __constant_htonl(0x05050000) &&
+//    	    get_u32(payload,133) == __constant_htonl(0x31097edf) && get_u32(payload,145) == __constant_htonl(0xdcb8f792))
+    	    get_u16(payload,39) == 0 && get_u16(payload,135) == __constant_htons(0x7edf) && get_u16(payload,147) == __constant_htons(0xf792))
+
+    	{
+#ifdef IPP2P_DEBUG_WINMX
+    		printk(KERN_INFO "got WinMX\n");
+#endif
+    		return ((IPP2P_WINMX * 100) + 4);
+    	}
+    }
+    return 0;
+} /*search_winmx*/
+
+
+/*Search for appleJuice commands*/
+int
+search_apple (const unsigned char *payload, const u16 plen)
+{
+    if ( (plen > 7) && (payload[6] == 0x0d) && (payload[7] == 0x0a) && (memcmp(payload, "ajprot", 6) == 0))  return (IPP2P_APPLE * 100);
+
+    return 0;
+}
+
+
+/*Search for BitTorrent commands*/
+int
+search_bittorrent (const unsigned char *payload, const u16 plen)
+{
+    if (plen > 20)
+    {
+	/* test for match 0x13+"BitTorrent protocol" */
+	if (payload[0] == 0x13)
+	{
+		if (memcmp(payload+1, "BitTorrent protocol", 19) == 0) return (IPP2P_BIT * 100);
+	}
+
+	/* get tracker commandos, all starts with GET /
+	* then it can follow: scrape| announce
+	* and then ?hash_info=
+	*/
+	if (memcmp(payload,"GET /",5) == 0)
+	{
+		/* message scrape */
+		if ( memcmp(payload+5,"scrape?info_hash=",17)==0 ) return (IPP2P_BIT * 100 + 1);
+		/* message announce */
+		if ( memcmp(payload+5,"announce?info_hash=",19)==0 ) return (IPP2P_BIT * 100 + 2);
+	}
+    }
+    else
+    {
+    	/* bitcomet encryptes the first packet, so we have to detect another
+    	 * one later in the flow */
+    	 /* first try failed, too many missdetections */
+    	//if ( size == 5 && get_u32(t,0) == __constant_htonl(1) && t[4] < 3) return (IPP2P_BIT * 100 + 3);
+
+    	/* second try: block request packets */
+    	if ( plen == 17 && get_u32(payload,0) == __constant_htonl(0x0d) && payload[4] == 0x06 && get_u32(payload,13) == __constant_htonl(0x4000) ) return (IPP2P_BIT * 100 + 3);
+    }
+
+    return 0;
+}
+
+
+
+/*check for Kazaa get command*/
+int
+search_kazaa (const unsigned char *payload, const u16 plen)
+
+{
+    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a) && memcmp(payload, "GET /.hash=", 11) == 0)
+	return (IPP2P_DATA_KAZAA * 100);
+
+    return 0;
+}
+
+
+/*check for gnutella get command*/
+int
+search_gnu (const unsigned char *payload, const u16 plen)
+{
+    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a))
+    {
+	if (memcmp(payload, "GET /get/", 9) == 0)	return ((IPP2P_DATA_GNU * 100) + 1);
+	if (memcmp(payload, "GET /uri-res/", 13) == 0) return ((IPP2P_DATA_GNU * 100) + 2);
+    }
+    return 0;
+}
+
+
+/*check for gnutella get commands and other typical data*/
+int
+search_all_gnu (const unsigned char *payload, const u16 plen)
+{
+
+    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a))
+    {
+
+	if (memcmp(payload, "GNUTELLA CONNECT/", 17) == 0) return ((IPP2P_GNU * 100) + 1);
+	if (memcmp(payload, "GNUTELLA/", 9) == 0) return ((IPP2P_GNU * 100) + 2);
+
+
+	if ((memcmp(payload, "GET /get/", 9) == 0) || (memcmp(payload, "GET /uri-res/", 13) == 0))
+	{
+		u16 c=8;
+		const u16 end=plen-22;
+		while (c < end) {
+			if ( payload[c] == 0x0a && payload[c+1] == 0x0d && ((memcmp(&payload[c+2], "X-Gnutella-", 11) == 0) || (memcmp(&payload[c+2], "X-Queue:", 8) == 0)))
+				return ((IPP2P_GNU * 100) + 3);
+			c++;
+		}
+	}
+    }
+    return 0;
+}
+
+
+/*check for KaZaA download commands and other typical data*/
+int
+search_all_kazaa (const unsigned char *payload, const u16 plen)
+{
+    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a))
+    {
+
+	if (memcmp(payload, "GIVE ", 5) == 0) return ((IPP2P_KAZAA * 100) + 1);
+
+    	if (memcmp(payload, "GET /", 5) == 0) {
+		u16 c = 8;
+		const u16 end=plen-22;
+		while (c < end) {
+			if ( payload[c] == 0x0a && payload[c+1] == 0x0d && ((memcmp(&payload[c+2], "X-Kazaa-Username: ", 18) == 0) || (memcmp(&payload[c+2], "User-Agent: PeerEnabler/", 24) == 0)))
+				return ((IPP2P_KAZAA * 100) + 2);
+			c++;
+		}
+	}
+    }
+    return 0;
+}
+
+/*fast check for edonkey file segment transfer command*/
+int
+search_edk (const unsigned char *payload, const u16 plen)
+{
+    if (payload[0] != 0xe3)
+	return 0;
+    else {
+	if (payload[5] == 0x47)
+	    return (IPP2P_DATA_EDK * 100);
+	else
+	    return 0;
+    }
+}
+
+
+
+/*intensive but slower search for some edonkey packets including size-check*/
+int
+search_all_edk (const unsigned char *payload, const u16 plen)
+{
+    if (payload[0] != 0xe3)
+	return 0;
+    else {
+	//t += head_len;
+	const u16 cmd = get_u16(payload, 1);
+	if (cmd == (plen - 5)) {
+	    switch (payload[5]) {
+		case 0x01: return ((IPP2P_EDK * 100) + 1);	/*Client: hello or Server:hello*/
+		case 0x4c: return ((IPP2P_EDK * 100) + 9);	/*Client: Hello-Answer*/
+	    }
+	}
+	return 0;
+     }
+}
+
+
+/*fast check for Direct Connect send command*/
+int
+search_dc (const unsigned char *payload, const u16 plen)
+{
+
+    if (payload[0] != 0x24 )
+	return 0;
+    else {
+	if (memcmp(&payload[1], "Send|", 5) == 0)
+	    return (IPP2P_DATA_DC * 100);
+	else
+	    return 0;
+    }
+
+}
+
+
+/*intensive but slower check for all direct connect packets*/
+int
+search_all_dc (const unsigned char *payload, const u16 plen)
+{
+//    unsigned char *t = haystack;
+
+    if (payload[0] == 0x24 && payload[plen-1] == 0x7c)
+    {
+    	const unsigned char *t=&payload[1];
+    		/* Client-Hub-Protocol */
+	if (memcmp(t, "Lock ", 5) == 0)	 		return ((IPP2P_DC * 100) + 1);
+	/* Client-Client-Protocol, some are already recognized by client-hub (like lock) */
+	if (memcmp(t, "MyNick ", 7) == 0)	 	return ((IPP2P_DC * 100) + 38);
+    }
+    return 0;
+}
+
+/*check for mute*/
+int
+search_mute (const unsigned char *payload, const u16 plen)
+{
+	if ( plen == 209 || plen == 345 || plen == 473 || plen == 609 || plen == 1121 )
+	{
+		//printk(KERN_DEBUG "size hit: %u",size);
+		if (memcmp(payload,"PublicKey: ",11) == 0 )
+		{
+			return ((IPP2P_MUTE * 100) + 0);
+
+/*			if (memcmp(t+size-14,"\x0aEndPublicKey\x0a",14) == 0)
+			{
+				printk(KERN_DEBUG "end pubic key hit: %u",size);
+
+			}*/
+		}
+	}
+	return 0;
+}
+
+
+/* check for xdcc */
+int
+search_xdcc (const unsigned char *payload, const u16 plen)
+{
+	/* search in small packets only */
+	if (plen > 20 && plen < 200 && payload[plen-1] == 0x0a && payload[plen-2] == 0x0d && memcmp(payload,"PRIVMSG ",8) == 0)
+	{
+
+		u16 x=10;
+		const u16 end=plen - 13;
+
+		/* is seems to be a irc private massage, chedck for xdcc command */
+		while (x < end)
+		{
+			if (payload[x] == ':')
+			{
+				if ( memcmp(&payload[x+1],"xdcc send #",11) == 0 )
+					return ((IPP2P_XDCC * 100) + 0);
+			}
+			x++;
+		}
+	}
+	return 0;
+}
+
+/* search for waste */
+int search_waste(const unsigned char *payload, const u16 plen)
+{
+	if ( plen >= 8 && memcmp(payload,"GET.sha1:",9) == 0)
+		return ((IPP2P_WASTE * 100) + 0);
+
+	return 0;
+}
+
+
+static struct {
+    int command;
+    __u8 short_hand;			/*for fucntions included in short hands*/
+    int packet_len;
+    int (*function_name) (const unsigned char *, const u16);
+} matchlist[] = {
+    {IPP2P_EDK,SHORT_HAND_IPP2P,20, &search_all_edk},
+//    {IPP2P_DATA_KAZAA,SHORT_HAND_DATA,200, &search_kazaa},
+//    {IPP2P_DATA_EDK,SHORT_HAND_DATA,60, &search_edk},
+//    {IPP2P_DATA_DC,SHORT_HAND_DATA,26, &search_dc},
+    {IPP2P_DC,SHORT_HAND_IPP2P,5, search_all_dc},
+//    {IPP2P_DATA_GNU,SHORT_HAND_DATA,40, &search_gnu},
+    {IPP2P_GNU,SHORT_HAND_IPP2P,5, &search_all_gnu},
+    {IPP2P_KAZAA,SHORT_HAND_IPP2P,5, &search_all_kazaa},
+    {IPP2P_BIT,SHORT_HAND_IPP2P,20, &search_bittorrent},
+    {IPP2P_APPLE,SHORT_HAND_IPP2P,5, &search_apple},
+    {IPP2P_SOUL,SHORT_HAND_IPP2P,5, &search_soul},
+    {IPP2P_WINMX,SHORT_HAND_IPP2P,2, &search_winmx},
+    {IPP2P_ARES,SHORT_HAND_IPP2P,5, &search_ares},
+    {IPP2P_MUTE,SHORT_HAND_NONE,200, &search_mute},
+    {IPP2P_WASTE,SHORT_HAND_NONE,5, &search_waste},
+    {IPP2P_XDCC,SHORT_HAND_NONE,5, &search_xdcc},
+    {0,0,0,NULL}
+};
+
+
+static struct {
+    int command;
+    __u8 short_hand;			/*for fucntions included in short hands*/
+    int packet_len;
+    int (*function_name) (unsigned char *, int);
+} udp_list[] = {
+    {IPP2P_KAZAA,SHORT_HAND_IPP2P,14, &udp_search_kazaa},
+    {IPP2P_BIT,SHORT_HAND_IPP2P,23, &udp_search_bit},
+    {IPP2P_GNU,SHORT_HAND_IPP2P,11, &udp_search_gnu},
+    {IPP2P_EDK,SHORT_HAND_IPP2P,9, &udp_search_edk},
+    {IPP2P_DC,SHORT_HAND_IPP2P,12, &udp_search_directconnect},
+    {0,0,0,NULL}
+};
+
+
+static bool
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const struct xt_match *match,
+      const void *matchinfo,
+      int offset,
+      unsigned int protoff,
+      bool *hotdrop)
+{
+    const struct ipt_p2p_info *info = matchinfo;
+    unsigned char  *haystack;
+    struct iphdr *ip = ip_hdr(skb);
+    int p2p_result = 0, i = 0;
+//    int head_len;
+    int hlen = ntohs(ip->tot_len)-(ip->ihl*4);	/*hlen = packet-data length*/
+
+    /*must not be a fragment*/
+    if (offset) {
+	if (info->debug) printk("IPP2P.match: offset found %i \n",offset);
+	return 0;
+    }
+
+    /*make sure that skb is linear*/
+    if(skb_is_nonlinear(skb)){
+	if (info->debug) printk("IPP2P.match: nonlinear skb found\n");
+	return 0;
+    }
+
+
+    haystack=(char *)ip+(ip->ihl*4);		/*haystack = packet data*/
+
+    switch (ip->protocol){
+	case IPPROTO_TCP:		/*what to do with a TCP packet*/
+	{
+	    struct tcphdr *tcph = (void *) ip + ip->ihl * 4;
+
+	    if (tcph->fin) return 0;  /*if FIN bit is set bail out*/
+	    if (tcph->syn) return 0;  /*if SYN bit is set bail out*/
+	    if (tcph->rst) return 0;  /*if RST bit is set bail out*/
+
+	    haystack += tcph->doff * 4; /*get TCP-Header-Size*/
+	    hlen -= tcph->doff * 4;
+	    while (matchlist[i].command) {
+		if ((((info->cmd & matchlist[i].command) == matchlist[i].command) ||
+		    ((info->cmd & matchlist[i].short_hand) == matchlist[i].short_hand)) &&
+		    (hlen > matchlist[i].packet_len)) {
+			    p2p_result = matchlist[i].function_name(haystack, hlen);
+			    if (p2p_result)
+			    {
+				if (info->debug) printk("IPP2P.debug:TCP-match: %i from: %u.%u.%u.%u:%i to: %u.%u.%u.%u:%i Length: %i\n",
+				    p2p_result, NIPQUAD(ip->saddr),ntohs(tcph->source), NIPQUAD(ip->daddr),ntohs(tcph->dest),hlen);
+				return p2p_result;
+    			    }
+    		}
+	    i++;
+	    }
+	    return p2p_result;
+	}
+
+	case IPPROTO_UDP:		/*what to do with an UDP packet*/
+	{
+	    struct udphdr *udph = (void *) ip + ip->ihl * 4;
+
+	    while (udp_list[i].command){
+		if ((((info->cmd & udp_list[i].command) == udp_list[i].command) ||
+		    ((info->cmd & udp_list[i].short_hand) == udp_list[i].short_hand)) &&
+		    (hlen > udp_list[i].packet_len)) {
+			    p2p_result = udp_list[i].function_name(haystack, hlen);
+			    if (p2p_result){
+				if (info->debug) printk("IPP2P.debug:UDP-match: %i from: %u.%u.%u.%u:%i to: %u.%u.%u.%u:%i Length: %i\n",
+				    p2p_result, NIPQUAD(ip->saddr),ntohs(udph->source), NIPQUAD(ip->daddr),ntohs(udph->dest),hlen);
+				return p2p_result;
+			    }
+		}
+	    i++;
+	    }
+	    return p2p_result;
+	}
+
+	default: return 0;
+    }
+}
+
+
+
+static bool
+checkentry(const char *tablename,
+	    const void *ip,
+	    const struct xt_match *match,
+	    void *matchinfo,
+	    unsigned int hook_mask)
+{
+        /* Must specify -p tcp */
+/*    if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) {
+ *	printk("ipp2p: Only works on TCP packets, use -p tcp\n");
+ *	return 0;
+ *    }*/
+    return 1;
+}
+
+
+
+
+static struct ipt_match ipp2p_match = {
+	.name		= "ipp2p",
+	.match		= &match,
+	.family		= AF_INET,
+	.matchsize	= sizeof(struct ipt_p2p_info),
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+
+static int __init init(void)
+{
+    printk(KERN_INFO "IPP2P v%s loading\n", IPP2P_VERSION);
+    return xt_register_match(&ipp2p_match);
+}
+
+static void __exit fini(void)
+{
+    xt_unregister_match(&ipp2p_match);
+    printk(KERN_INFO "IPP2P v%s unloaded\n", IPP2P_VERSION);
+}
+
+module_init(init);
+module_exit(fini);
+
+
Index: linux-2.6.23.1/net/ipv4/netfilter/Kconfig
===================================================================
--- linux-2.6.23.1.orig/net/ipv4/netfilter/Kconfig	2007-11-19 18:21:55.000000000 -0600
+++ linux-2.6.23.1/net/ipv4/netfilter/Kconfig	2007-11-19 18:22:19.000000000 -0600
@@ -63,6 +63,12 @@
 	  To compile it as a module, choose M here.  If unsure, say N.
 
 # The matches.
+config IP_NF_MATCH_IPP2P
+	tristate "IPP2P"
+	depends on IP_NF_IPTABLES
+	help
+	  Module for matching traffic of various Peer-to-Peer applications
+
 config IP_NF_MATCH_RECENT
 	tristate '"recent" match support'
 	depends on IP_NF_IPTABLES
Index: linux-2.6.23.1/net/ipv4/netfilter/Makefile
===================================================================
--- linux-2.6.23.1.orig/net/ipv4/netfilter/Makefile	2007-11-19 18:21:55.000000000 -0600
+++ linux-2.6.23.1/net/ipv4/netfilter/Makefile	2007-11-19 18:23:45.000000000 -0600
@@ -50,6 +50,8 @@
 obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
 obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
 
+obj-$(CONFIG_IP_NF_MATCH_IPP2P) += ipt_ipp2p.o
+
 # targets
 obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
 obj-$(CONFIG_IP_NF_TARGET_TOS) += ipt_TOS.o