path: root/recipes/linux/linux-wrt-2.4.30/304-netfilter-ipp2p-0.7.4

diff -urN linux-2.4.29.old/include/linux/netfilter_ipv4/ipt_ipp2p.h linux-2.4.29/include/linux/netfilter_ipv4/ipt_ipp2p.h
--- linux-2.4.29.old/include/linux/netfilter_ipv4/ipt_ipp2p.h	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.29/include/linux/netfilter_ipv4/ipt_ipp2p.h	2005-03-12 00:44:17.000000000 +0100
@@ -0,0 +1,29 @@
+#ifndef __IPT_IPP2P_H
+#define __IPT_IPP2P_H
+#define IPP2P_VERSION "0.7.4"
+
+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		2
+#define IPP2P_DATA_KAZAA	8
+#define IPP2P_DATA_EDK		16
+#define IPP2P_DATA_DC		32
+#define IPP2P_DC		64
+#define IPP2P_DATA_GNU		128
+#define IPP2P_GNU		256
+#define IPP2P_KAZAA		512
+#define IPP2P_BIT		1024
+#define IPP2P_APPLE		2048
+#define IPP2P_SOUL		4096
+#define IPP2P_WINMX		8192
+#define IPP2P_ARES		16384
+
diff -urN linux-2.4.29.old/net/ipv4/netfilter/Config.in linux-2.4.29/net/ipv4/netfilter/Config.in
--- linux-2.4.29.old/net/ipv4/netfilter/Config.in	2005-03-12 00:40:38.000000000 +0100
+++ linux-2.4.29/net/ipv4/netfilter/Config.in	2005-03-12 00:42:57.000000000 +0100
@@ -26,6 +26,7 @@
   dep_tristate '  TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
   dep_tristate '  recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
   dep_tristate '  ECN match support' CONFIG_IP_NF_MATCH_ECN $CONFIG_IP_NF_IPTABLES
+  dep_tristate '  peer to peer traffic match support' CONFIG_IP_NF_MATCH_IPP2P $CONFIG_IP_NF_IPTABLES
  
   dep_tristate '  DSCP match support' CONFIG_IP_NF_MATCH_DSCP $CONFIG_IP_NF_IPTABLES
  
diff -urN linux-2.4.29.old/net/ipv4/netfilter/ipt_ipp2p.c linux-2.4.29/net/ipv4/netfilter/ipt_ipp2p.c
--- linux-2.4.29.old/net/ipv4/netfilter/ipt_ipp2p.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.29/net/ipv4/netfilter/ipt_ipp2p.c	2005-03-12 00:44:02.000000000 +0100
@@ -0,0 +1,661 @@
+#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 "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 <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]) {
+			/* e3 9a + 16Bytes Hash | size == 26 */
+	case 0x9a: if (packet_len == 26) return ((IPP2P_EDK * 100) + 1);
+			/* e3 96 xx yy zz kk | size == 14 | server status request */
+	case 0x96: if (packet_len == 14) return ((IPP2P_EDK * 100) + 2);
+			/* e3 a2 | size == 10 or 14 <-- recheck*/
+	}
+    }
+
+    case 0xc5: {	/*emule*/
+	switch (t[1]) {
+			/* c5 91 xx yy | size == 12 (8+4) | xx != 0x00  -- xx yy queue rating */
+	case 0x91: if ((packet_len == 12) && (t[2] != 0x00)) return ((IPP2P_EDK * 100) + 3);
+			/* c5 90 xx ..  yy | size == 26 (8+2+16) | xx .. yy == hash  -- file ping */
+	case 0x90: if ((packet_len == 26) && (t[2] != 0x00)) return ((IPP2P_EDK * 100) + 4);
+			/* c5 92 | size == 10 (8+2) -- file not found */
+	case 0x92: if (packet_len == 10) return ((IPP2P_EDK * 100) + 5);
+			/* c5 93 | size == 10 (8+2) -- queue full */
+	case 0x93: if (packet_len == 10) return ((IPP2P_EDK * 100) + 6);
+	}
+    }
+
+    case 0xe4: {	/*kad*/
+	switch (t[1]) {
+			/* e4 50 | size == 12 */
+	    case 0x50: if (packet_len == 12) return ((IPP2P_EDK * 100) + 7);
+			/* e4 58 | size == 14 */
+	    case 0x58: if ((packet_len == 14) && (t[2] != 0x00)) return ((IPP2P_EDK * 100) + 8);
+			/* e4 59 | size == 10 */
+	    case 0x59: if (packet_len == 10) return ((IPP2P_EDK * 100) + 9);
+			/* e4 30 .. | t[18] == 0x01 | size > 26 | --> search */
+	    case 0x30: if ((packet_len > 26) && (t[18] == 0x01)) return ((IPP2P_EDK * 100) + 10);
+			/* e4 28 .. 00 | t[68] == 0x00 | size > 76 */
+	    case 0x28: if ((packet_len > 76) && (t[68] == 0x00)) return ((IPP2P_EDK * 100) + 11);
+			/* e4 20 .. | size == 43 */
+	    case 0x20: if ((packet_len == 43) && (t[2] != 0x00) && (t[34] != 0x00)) return ((IPP2P_EDK * 100) + 12);
+			/* e4 00 .. 00 | size == 35 ? */
+	    case 0x00: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 13);
+			/* e4 10 .. 00 | size == 35 ? */
+	    case 0x10: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 14);
+			/* e4 18 .. 00 | size == 35 ? */
+	    case 0x18: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 15);
+			/* e4 40 .. | t[18] == 0x01 | t[19] == 0x00 | size > 40 */
+	    case 0x40: if ((packet_len > 40) && (t[18] == 0x01) && (t[19] == 0x00)) return ((IPP2P_EDK * 100) + 16);
+	}
+    }
+    
+    default: return 0;
+    } /* end of switch (t[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) + 1);
+    if (memcmp(t, "GNUTELLA ", 9) == 0) return ((IPP2P_GNU * 100) + 2);
+    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);
+    }
+    return 0;
+}/*udp_search_kazaa*/
+
+
+/*Search for UDP BitTorrent commands*/
+int
+udp_search_bit (unsigned char *haystack, int packet_len)
+{
+    unsigned char *t = haystack;
+    
+    /* packet_len has to be 24 */
+    if (packet_len != 24) return 0;
+
+    t += 8;    
+
+    /* ^ 00 00 04 17 27 10 19 80 */
+    if ((ntohl(get_u32(t, 0)) == 0x00000417) && (ntohl(get_u32(t, 4)) == 0x27101980)) return (IPP2P_BIT * 100);
+
+    return 0;
+}/*udp_search_bit*/
+
+
+
+/*Search for Ares commands*/
+int
+search_ares (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    t += head_len;
+
+    if ((packet_len - head_len) == 6){	/* possible connect command*/
+	if ((t[0] == 0x03) && (t[1] == 0x00) && (t[2] == 0x5a) && (t[3] == 0x04) && (t[4] == 0x03) && (t[5] == 0x05))
+	    return ((IPP2P_ARES * 100) + 1);			/* found connect packet: 03 00 5a 04 03 05 */
+    }
+    if ((packet_len - head_len) == 60){	/* possible download command*/
+	if ((t[59] == 0x0a) && (t[58] == 0x0a)){
+	    if (memcmp(t, "PUSH SHA1:", 10) == 0) /* found download command */
+	    	return ((IPP2P_ARES * 100) + 2);
+	}
+    }
+    return 0;
+} /*search_ares*/
+
+
+/*Search for SoulSeek commands*/
+int
+search_soul (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    t += head_len;
+
+    if (get_u16(t, 0) == (packet_len - head_len - 4)){
+	    /* xx xx 00 00 yy zz 00 00 .. | xx = sizeof(payload) - 4 */
+	if ((get_u16(t,2) == 0x0000) &&(t[4] != 0x00) && (get_u16(t,6) == 0x0000))
+	    return ((IPP2P_SOUL * 100) + 1);
+    } else {
+	    /* 00 00 00 00 00 00 00 00 + sizeof(payload) == 8*/
+	if (((packet_len - head_len) == 8) && (get_u32(t, 0) == 0x00000000) && (get_u32(t, 4) == 0x00000000))
+	    return ((IPP2P_SOUL * 100) + 2);
+    }
+    
+    /* 01 xx 00 00 00 yy .. zz 00 00 00 .. | xx == sizeof(nick) | yy .. zz == nick */
+    if ((t[0] == 0x01) && (t[2] == 0x00) && (get_u16(t,3) == 0x0000) && ((packet_len - head_len) > ((get_u8(t,1))+6)) && 
+	(t[(get_u8(t,1))+4] != 0x00) && (t[(get_u8(t,1))+5] == 0x01) && (t[(get_u8(t,1))+6] == 0x00))
+	    return ((IPP2P_SOUL * 100) + 3);
+    return 0;
+}
+
+
+/*Search for WinMX commands*/
+int
+search_winmx (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    int c;
+    t += head_len;
+
+    if (((packet_len - head_len) == 4) && (memcmp(t, "SEND", 4) == 0))  return ((IPP2P_WINMX * 100) + 1);
+    if (((packet_len - head_len) == 3) && (memcmp(t, "GET", 3) == 0))  return ((IPP2P_WINMX * 100) + 2);
+    if (packet_len < (head_len + 10)) return 0;
+
+    if ((memcmp(t, "SEND", 4) == 0) || (memcmp(t, "GET", 3) == 0)){
+        c = head_len + 4;
+	t += 4;
+	while (c < packet_len - 5) {
+	    if ((t[0] == 0x20) && (t[1] == 0x22)){
+		c += 2;
+		t += 2;
+		while (c < packet_len - 2) {
+		    if ((t[0] == 0x22) && (t[1] == 0x20)) return ((IPP2P_WINMX * 100) + 3);
+		    t++;
+		    c++;
+		}
+	    }
+	    t++;
+	    c++;
+	}    
+    }
+    return 0;
+} /*search_winmx*/
+
+
+/*Search for appleJuice commands*/
+int
+search_apple (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    t += head_len;
+    
+    if ((memcmp(t, "ajprot", 6) == 0) && (t[6] == 0x0d) && (t[7] == 0x0a))  return (IPP2P_APPLE * 100);
+    
+    return 0;
+}
+
+
+/*Search for BitTorrent commands*/
+int
+search_bittorrent (unsigned char *haystack, int packet_len, int head_len)
+{
+
+    unsigned char *t = haystack;
+    if (*(haystack+head_len) != 0x13) return 0; /*Bail out of first byte != 0x13*/
+    
+    t += head_len + 1;
+    
+    if (memcmp(t, "BitTorrent protocol", 19) == 0) return (IPP2P_BIT * 100);
+    return 0;
+}
+
+
+
+/*check for Kazaa get command*/
+int
+search_kazaa (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+
+    if (!((*(haystack + packet_len - 2) == 0x0d) && (*(haystack + packet_len - 1) == 0x0a))) return 0;    
+
+    t += head_len;
+    if (memcmp(t, "GET /.hash=", 11) == 0)
+	return (IPP2P_DATA_KAZAA * 100);
+    else
+	return 0;
+}
+
+
+/*check for gnutella get command*/
+int
+search_gnu (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+
+    if (!((*(haystack + packet_len - 2) == 0x0d) && (*(haystack + packet_len - 1) == 0x0a))) return 0;    
+
+    t += head_len;
+    if (memcmp(t, "GET /get/", 9) == 0)	return ((IPP2P_DATA_GNU * 100) + 1);
+    if (memcmp(t, "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 (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    int c;    
+
+    if (!((*(haystack + packet_len - 2) == 0x0d) && (*(haystack + packet_len - 1) == 0x0a))) return 0;
+
+    t += head_len;
+
+    if (memcmp(t, "GNUTELLA CONNECT/", 17) == 0) return ((IPP2P_GNU * 100) + 1);
+    if (memcmp(t, "GNUTELLA/", 9) == 0) return ((IPP2P_GNU * 100) + 2);    
+
+    if ((memcmp(t, "GET /get/", 9) == 0) || (memcmp(t, "GET /uri-res/", 13) == 0))
+    {        
+        c = head_len + 8;
+	t += 8;
+	while (c < packet_len - 22) {
+	    if ((t[0] == 0x0d) && (t[1] == 0x0a)) {
+		    t += 2;
+		    c += 2;
+		    if ((memcmp(t, "X-Gnutella-", 11) == 0) || (memcmp(t, "X-Queue:", 8) == 0)) return ((IPP2P_GNU * 100) + 3);
+	    } else {
+		t++;
+		c++;
+	    }    
+	}
+    }
+    return 0;
+}
+
+
+/*check for KaZaA download commands and other typical data*/
+int
+search_all_kazaa (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    int c;    
+
+    if (!((*(haystack + packet_len - 2) == 0x0d) && (*(haystack + packet_len - 1) == 0x0a))) return 0;
+
+    t += head_len;
+    if (memcmp(t, "GIVE ", 5) == 0) return ((IPP2P_KAZAA * 100) + 1);
+    
+    if (memcmp(t, "GET /", 5) == 0) {
+        c = head_len + 8;
+	t += 8;
+	while (c < packet_len - 22) {
+	    if ((t[0] == 0x0d) && (t[1] == 0x0a)) {
+		    t += 2;
+		    c += 2;
+		    if ( memcmp(t, "X-Kazaa-Username: ", 18) == 0 ) return ((IPP2P_KAZAA * 100) + 2);
+		    if ( memcmp(t, "User-Agent: PeerEnabler/", 24) == 0 ) return ((IPP2P_KAZAA * 100) + 3);
+	    } else {
+		t++;
+		c++;
+	    }    
+	}
+    }
+    
+    return 0;
+}
+
+/*fast check for edonkey file segment transfer command*/
+int
+search_edk (unsigned char *haystack, int packet_len, int head_len)
+{
+    if (*(haystack+head_len) != 0xe3) 
+	return 0;
+    else {
+	if (*(haystack+head_len+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 (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+    int cmd;
+    
+    if (*(haystack+head_len) == 0xd4) {
+	t += head_len;	
+	cmd = get_u16(t, 1);	
+	if (cmd == (packet_len - head_len - 5))	{
+	    switch (t[5]) {
+		case 0x82: return ((IPP2P_EDK * 100) + 42);
+		case 0x15: return ((IPP2P_EDK * 100) + 43);
+		default: return 0;
+	    }
+	}
+	return 0;    
+    }
+    
+    
+    if (*(haystack+head_len) == 0xc5) {	/*search for additional eMule packets*/
+	t += head_len;	
+	cmd = get_u16(t, 1);	
+
+	if (cmd == (packet_len - head_len - 5))	{
+	    switch (t[5]) {
+		case 0x01: return ((IPP2P_EDK * 100) + 30);
+		case 0x02: return ((IPP2P_EDK * 100) + 31);
+		case 0x60: return ((IPP2P_EDK * 100) + 32);
+		case 0x81: return ((IPP2P_EDK * 100) + 33);
+		case 0x82: return ((IPP2P_EDK * 100) + 34);
+		case 0x85: return ((IPP2P_EDK * 100) + 35);
+		case 0x86: return ((IPP2P_EDK * 100) + 36);
+		case 0x87: return ((IPP2P_EDK * 100) + 37);
+		case 0x40: return ((IPP2P_EDK * 100) + 38);
+		case 0x92: return ((IPP2P_EDK * 100) + 39);
+		case 0x93: return ((IPP2P_EDK * 100) + 40);
+		case 0x12: return ((IPP2P_EDK * 100) + 41);
+		default: return 0;
+	    }
+	}
+	
+	return 0;
+    }
+
+
+    if (*(haystack+head_len) != 0xe3) 
+	return 0;
+    else {
+	t += head_len;	
+	cmd = get_u16(t, 1);
+	if (cmd == (packet_len - head_len - 5)) {
+	    switch (t[5]) {
+		case 0x01: return ((IPP2P_EDK * 100) + 1);	/*Client: hello or Server:hello*/
+		case 0x50: return ((IPP2P_EDK * 100) + 2);	/*Client: file status*/
+		case 0x16: return ((IPP2P_EDK * 100) + 3);	/*Client: search*/
+		case 0x58: return ((IPP2P_EDK * 100) + 4);	/*Client: file request*/
+		case 0x48: return ((IPP2P_EDK * 100) + 5);	/*???*/
+		case 0x54: return ((IPP2P_EDK * 100) + 6);	/*???*/
+		case 0x47: return ((IPP2P_EDK * 100) + 7);	/*Client: file segment request*/
+		case 0x46: return ((IPP2P_EDK * 100) + 8); 	/*Client: download segment*/
+		case 0x4c: return ((IPP2P_EDK * 100) + 9);	/*Client: Hello-Answer*/
+		case 0x4f: return ((IPP2P_EDK * 100) + 10);	/*Client: file status request*/
+		case 0x59: return ((IPP2P_EDK * 100) + 11);	/*Client: file request answer*/
+		case 0x65: return ((IPP2P_EDK * 100) + 12);	/*Client: ???*/
+		case 0x66: return ((IPP2P_EDK * 100) + 13);	/*Client: ???*/
+		case 0x51: return ((IPP2P_EDK * 100) + 14);	/*Client: ???*/
+		case 0x52: return ((IPP2P_EDK * 100) + 15);	/*Client: ???*/
+		case 0x4d: return ((IPP2P_EDK * 100) + 16);	/*Client: ???*/
+		case 0x5c: return ((IPP2P_EDK * 100) + 17);	/*Client: ???*/
+		case 0x38: return ((IPP2P_EDK * 100) + 18);	/*Client: ???*/
+		case 0x69: return ((IPP2P_EDK * 100) + 19);	/*Client: ???*/
+		case 0x19: return ((IPP2P_EDK * 100) + 20);	/*Client: ???*/
+		case 0x42: return ((IPP2P_EDK * 100) + 21);	/*Client: ???*/
+		case 0x34: return ((IPP2P_EDK * 100) + 22);	/*Client: ???*/
+		case 0x94: return ((IPP2P_EDK * 100) + 23);	/*Client: ???*/
+		case 0x1c: return ((IPP2P_EDK * 100) + 24);	/*Client: ???*/
+		case 0x6a: return ((IPP2P_EDK * 100) + 25);	/*Client: ???*/
+		default: return 0;
+	    }
+	} else {
+	    if (cmd > packet_len - head_len - 5) {
+		if ((t[3] == 0x00) && (t[4] == 0x00)) {
+		    if (t[5] == 0x01) return ((IPP2P_EDK * 100) + 26);
+		    if (t[5] == 0x4c) return ((IPP2P_EDK * 100) + 27);
+		} 
+		return 0;
+		
+	    }	/*non edk packet*/
+	    if (t[cmd+5] == 0xe3) return ((IPP2P_EDK * 100) + 28);/*found another edk-command*/
+	    if (t[cmd+5] == 0xc5) return ((IPP2P_EDK * 100) + 29);/*found an emule-command*/	    
+	    return 0;
+	}
+    }
+}
+
+
+/*fast check for Direct Connect send command*/
+int
+search_dc (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+
+    if (*(haystack+head_len) != 0x24 ) 
+	return 0;
+    else {
+	t += head_len + 1;
+        if (memcmp(t, "Send|", 5) == 0)
+	    return (IPP2P_DATA_DC * 100);
+	else
+	    return 0;
+    }	
+
+}
+
+
+/*intensive but slower check for all direct connect packets*/
+int
+search_all_dc (unsigned char *haystack, int packet_len, int head_len)
+{
+    unsigned char *t = haystack;
+
+    if ((*(haystack + head_len) == 0x24) && (*(haystack + packet_len - 1) == 0x7c)) {
+    	t += head_len + 1;
+	if (memcmp(t, "Lock ", 5) == 0)	 return ((IPP2P_DC * 100) + 1); /*hub: hello*/
+	if (memcmp(t, "Key ", 4) == 0)	 return ((IPP2P_DC * 100) + 2); /*client: hello*/
+	if (memcmp(t, "Hello ", 6) == 0) return ((IPP2P_DC * 100) + 3); /*hub:connected*/
+	if (memcmp(t, "MyNick ", 7) == 0) return ((IPP2P_DC * 100) + 4); /*client-client: hello*/
+	if (memcmp(t, "Search ", 7) == 0) return ((IPP2P_DC * 100) + 5); /*client: search*/
+	if (memcmp(t, "Send", 4) == 0)	 return ((IPP2P_DC * 100) + 6); /*client: start download*/
+	return 0;
+    } else
+	return 0;
+}
+
+
+static struct {
+    int command;
+    __u8 short_hand;			/*for fucntions included in short hands*/
+    int packet_len;
+    int (*function_name) (unsigned char *, int, int);
+} matchlist[] = {
+    {IPP2P_EDK,SHORT_HAND_IPP2P,40, &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,25, search_all_dc},
+    {IPP2P_DATA_GNU,SHORT_HAND_DATA,40, &search_gnu},
+    {IPP2P_GNU,SHORT_HAND_IPP2P,35, &search_all_gnu},
+    {IPP2P_KAZAA,SHORT_HAND_IPP2P,35, &search_all_kazaa},
+    {IPP2P_BIT,SHORT_HAND_NONE,40, &search_bittorrent},
+    {IPP2P_APPLE,SHORT_HAND_NONE,20, &search_apple},
+    {IPP2P_SOUL,SHORT_HAND_NONE,25, &search_soul},
+    {IPP2P_WINMX,SHORT_HAND_NONE,20, &search_winmx},
+    {IPP2P_ARES,SHORT_HAND_NONE,25, &search_ares},
+    {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_NONE,23, &udp_search_bit},
+    {IPP2P_GNU,SHORT_HAND_IPP2P,11, &udp_search_gnu},
+    {IPP2P_EDK,SHORT_HAND_IPP2P,9, &udp_search_edk},
+    {0,0,0,NULL}
+};
+
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+      const void *hdr,
+      u_int16_t datalen,
+#endif
+
+      int *hotdrop)
+{
+    const struct ipt_p2p_info *info = matchinfo;
+    unsigned char  *haystack;
+    struct iphdr *ip = skb->nh.iph;
+    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*/
+	    head_len = tcph->doff * 4; /*get TCP-Header-Size*/
+	    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, head_len);
+			    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 int
+checkentry(const char *tablename,
+            const struct ipt_ip *ip,
+	    void *matchinfo,
+	    unsigned int matchsize,
+	    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 = { 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+	{ NULL, NULL }, 
+	"ipp2p", 
+	&match, 
+	&checkentry, 
+	NULL, 
+	THIS_MODULE
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
+	.name		= "ipp2p",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+#endif
+};
+
+
+static int __init init(void)
+{
+    printk(KERN_INFO "IPP2P v%s loading\n", IPP2P_VERSION);
+    return ipt_register_match(&ipp2p_match);
+}
+	
+static void __exit fini(void)
+{
+    ipt_unregister_match(&ipp2p_match);
+    printk(KERN_INFO "IPP2P v%s unloaded\n", IPP2P_VERSION);    
+}
+	
+module_init(init);
+module_exit(fini);
+
+
diff -urN linux-2.4.29.old/net/ipv4/netfilter/Makefile linux-2.4.29/net/ipv4/netfilter/Makefile
--- linux-2.4.29.old/net/ipv4/netfilter/Makefile	2005-03-12 00:40:38.000000000 +0100
+++ linux-2.4.29/net/ipv4/netfilter/Makefile	2005-03-12 00:42:57.000000000 +0100
@@ -67,6 +67,7 @@
 obj-$(CONFIG_IP_NF_MATCH_LIMIT) += ipt_limit.o
 obj-$(CONFIG_IP_NF_MATCH_MARK) += ipt_mark.o
 obj-$(CONFIG_IP_NF_MATCH_MAC) += ipt_mac.o
+obj-$(CONFIG_IP_NF_MATCH_IPP2P) += ipt_ipp2p.o
 
 obj-$(CONFIG_IP_NF_MATCH_PKTTYPE) += ipt_pkttype.o
 obj-$(CONFIG_IP_NF_MATCH_MULTIPORT) += ipt_multiport.o