--- /dev/null
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+
+#include <xtables.h>
+#include "xt_ipp2p.h"
+
+static void
+help(void)
+{
+ printf(
+ "IPP2P v%s options:\n"
+ " --ipp2p Grab all known p2p packets\n"
+ " --edk [TCP&UDP] All known eDonkey/eMule/Overnet packets\n"
+ " --dc [TCP] All known Direct Connect packets\n"
+ " --kazaa [TCP&UDP] All known KaZaA packets\n"
+ " --gnu [TCP&UDP] All known Gnutella packets\n"
+ " --bit [TCP&UDP] All known BitTorrent packets\n"
+ " --apple [TCP] All known AppleJuice packets\n"
+ " --winmx [TCP] All known WinMX\n"
+ " --soul [TCP] All known SoulSeek\n"
+ " --ares [TCP] All known Ares\n\n"
+ " EXPERIMENTAL protocols (please send feedback to: ipp2p@ipp2p.org) :\n"
+ " --mute [TCP] All known Mute packets\n"
+ " --waste [TCP] All known Waste packets\n"
+ " --xdcc [TCP] All known XDCC packets (only xdcc login)\n\n"
+ " DEBUG SUPPPORT, use only if you know why\n"
+ " --debug Generate kernel debug output, THIS WILL SLOW DOWN THE FILTER\n"
+ "\nNote that the follwing options will have the same meaning:\n"
+ " '--ipp2p' is equal to '--edk --dc --kazaa --gnu --bit --apple --winmx --soul --ares'\n"
+ "\nIPP2P was intended for TCP only. Due to increasing usage of UDP we needed to change this.\n"
+ "You can now use -p udp to search UDP packets only or without -p switch to search UDP and TCP packets.\n"
+ "\nSee README included with this package for more details or visit http://www.ipp2p.org\n"
+ "\nExamples:\n"
+ " iptables -A FORWARD -m ipp2p --ipp2p -j MARK --set-mark 0x01\n"
+ " iptables -A FORWARD -p udp -m ipp2p --kazaa --bit -j DROP\n"
+ " iptables -A FORWARD -p tcp -m ipp2p --edk --soul -j DROP\n\n"
+ , IPP2P_VERSION);
+}
+
+static struct option opts[] = {
+ { "ipp2p", 0, 0, '1' },
+ { "edk", 0, 0, '2' },
+ { "dc", 0, 0, '7' },
+ { "gnu", 0, 0, '9' },
+ { "kazaa", 0, 0, 'a' },
+ { "bit", 0, 0, 'b' },
+ { "apple", 0, 0, 'c' },
+ { "soul", 0, 0, 'd' },
+ { "winmx", 0, 0, 'e' },
+ { "ares", 0, 0, 'f' },
+ { "mute", 0, 0, 'g' },
+ { "waste", 0, 0, 'h' },
+ { "xdcc", 0, 0, 'i' },
+ { "debug", 0, 0, 'j' },
+ {0}
+};
+
+
+
+static void
+init(struct xt_entry_match *m)
+{
+ struct ipt_p2p_info *info = (struct ipt_p2p_info *)m->data;
+
+ /*init the module with default values*/
+ info->cmd = 0;
+ info->debug = 0;
+
+}
+
+
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry,
+ struct xt_entry_match **match)
+{
+ struct ipt_p2p_info *info = (struct ipt_p2p_info *)(*match)->data;
+
+ switch (c) {
+ case '1': /*cmd: ipp2p*/
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified once!");
+/* if ((*flags & SHORT_HAND_DATA) == SHORT_HAND_DATA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p-data' may only be "
+ "specified alone!");*/
+ if ((*flags) != 0)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += SHORT_HAND_IPP2P;
+ info->cmd = *flags;
+ break;
+
+ case '2': /*cmd: edk*/
+ if ((*flags & IPP2P_EDK) == IPP2P_EDK)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--edk' may only be "
+ "specified once");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+/* if ((*flags & SHORT_HAND_DATA) == SHORT_HAND_DATA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p-data' may only be "
+ "specified alone!");*/
+ if ((*flags & IPP2P_DATA_EDK) == IPP2P_DATA_EDK)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: use `--edk' OR `--edk-data' but not both of them!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_EDK;
+ info->cmd = *flags;
+ break;
+
+
+ case '7': /*cmd: dc*/
+ if ((*flags & IPP2P_DC) == IPP2P_DC)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--dc' may only be "
+ "specified once!");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+/* if ((*flags & SHORT_HAND_DATA) == SHORT_HAND_DATA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p-data' may only be "
+ "specified alone!");*/
+ if ((*flags & IPP2P_DATA_DC) == IPP2P_DATA_DC)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: use `--dc' OR `--dc-data' but not both of them!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_DC;
+ info->cmd = *flags;
+ break;
+
+
+ case '9': /*cmd: gnu*/
+ if ((*flags & IPP2P_GNU) == IPP2P_GNU)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--gnu' may only be "
+ "specified once!");
+/* if ((*flags & SHORT_HAND_DATA) == SHORT_HAND_DATA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p-data' may only be "
+ "specified alone!");*/
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if ((*flags & IPP2P_DATA_GNU) == IPP2P_DATA_GNU)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: use `--gnu' OR `--gnu-data' but not both of them!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_GNU;
+ info->cmd = *flags;
+ break;
+
+ case 'a': /*cmd: kazaa*/
+ if ((*flags & IPP2P_KAZAA) == IPP2P_KAZAA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--kazaa' may only be "
+ "specified once!");
+/* if ((*flags & SHORT_HAND_DATA) == SHORT_HAND_DATA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p-data' may only be "
+ "specified alone!");*/
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if ((*flags & IPP2P_DATA_KAZAA) == IPP2P_DATA_KAZAA)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: use `--kazaa' OR `--kazaa-data' but not both of them!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_KAZAA;
+ info->cmd = *flags;
+ break;
+
+ case 'b': /*cmd: bit*/
+ if ((*flags & IPP2P_BIT) == IPP2P_BIT)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--bit' may only be "
+ "specified once!");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_BIT;
+ info->cmd = *flags;
+ break;
+
+ case 'c': /*cmd: apple*/
+ if ((*flags & IPP2P_APPLE) == IPP2P_APPLE)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--apple' may only be "
+ "specified once!");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_APPLE;
+ info->cmd = *flags;
+ break;
+
+
+ case 'd': /*cmd: soul*/
+ if ((*flags & IPP2P_SOUL) == IPP2P_SOUL)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--soul' may only be "
+ "specified once!");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_SOUL;
+ info->cmd = *flags;
+ break;
+
+
+ case 'e': /*cmd: winmx*/
+ if ((*flags & IPP2P_WINMX) == IPP2P_WINMX)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--winmx' may only be "
+ "specified once!");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_WINMX;
+ info->cmd = *flags;
+ break;
+
+ case 'f': /*cmd: ares*/
+ if ((*flags & IPP2P_ARES) == IPP2P_ARES)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ares' may only be "
+ "specified once!");
+ if ((*flags & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ipp2p' may only be "
+ "specified alone!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_ARES;
+ info->cmd = *flags;
+ break;
+
+ case 'g': /*cmd: mute*/
+ if ((*flags & IPP2P_MUTE) == IPP2P_MUTE)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--mute' may only be "
+ "specified once!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_MUTE;
+ info->cmd = *flags;
+ break;
+ case 'h': /*cmd: waste*/
+ if ((*flags & IPP2P_WASTE) == IPP2P_WASTE)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--waste' may only be "
+ "specified once!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_WASTE;
+ info->cmd = *flags;
+ break;
+ case 'i': /*cmd: xdcc*/
+ if ((*flags & IPP2P_XDCC) == IPP2P_XDCC)
+ exit_error(PARAMETER_PROBLEM,
+ "ipp2p: `--ares' may only be "
+ "specified once!");
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ *flags += IPP2P_XDCC;
+ info->cmd = *flags;
+ break;
+
+ case 'j': /*cmd: debug*/
+ if (invert) exit_error(PARAMETER_PROBLEM, "ipp2p: invert [!] is not allowed!");
+ info->debug = 1;
+ break;
+
+ default:
+// exit_error(PARAMETER_PROBLEM,
+// "\nipp2p-parameter problem: for ipp2p usage type: iptables -m ipp2p --help\n");
+ return 0;
+ }
+ return 1;
+}
+
+
+static void
+final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "\nipp2p-parameter problem: for ipp2p usage type: iptables -m ipp2p --help\n");
+}
+
+
+
+static void
+print(const void *ip,
+ const struct xt_entry_match *match,
+ int numeric)
+{
+ struct ipt_p2p_info *info = (struct ipt_p2p_info *)match->data;
+
+ printf("ipp2p v%s", IPP2P_VERSION);
+ if ((info->cmd & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P) printf(" --ipp2p");
+// if ((info->cmd & SHORT_HAND_DATA) == SHORT_HAND_DATA) printf(" --ipp2p-data");
+ if ((info->cmd & IPP2P_KAZAA) == IPP2P_KAZAA) printf(" --kazaa");
+// if ((info->cmd & IPP2P_DATA_KAZAA) == IPP2P_DATA_KAZAA) printf(" --kazaa-data");
+// if ((info->cmd & IPP2P_DATA_GNU) == IPP2P_DATA_GNU) printf(" --gnu-data");
+ if ((info->cmd & IPP2P_GNU) == IPP2P_GNU) printf(" --gnu");
+ if ((info->cmd & IPP2P_EDK) == IPP2P_EDK) printf(" --edk");
+// if ((info->cmd & IPP2P_DATA_EDK) == IPP2P_DATA_EDK) printf(" --edk-data");
+// if ((info->cmd & IPP2P_DATA_DC) == IPP2P_DATA_DC) printf(" --dc-data");
+ if ((info->cmd & IPP2P_DC) == IPP2P_DC) printf(" --dc");
+ if ((info->cmd & IPP2P_BIT) == IPP2P_BIT) printf(" --bit");
+ if ((info->cmd & IPP2P_APPLE) == IPP2P_APPLE) printf(" --apple");
+ if ((info->cmd & IPP2P_SOUL) == IPP2P_SOUL) printf(" --soul");
+ if ((info->cmd & IPP2P_WINMX) == IPP2P_WINMX) printf(" --winmx");
+ if ((info->cmd & IPP2P_ARES) == IPP2P_ARES) printf(" --ares");
+ if ((info->cmd & IPP2P_MUTE) == IPP2P_MUTE) printf(" --mute");
+ if ((info->cmd & IPP2P_WASTE) == IPP2P_WASTE) printf(" --waste");
+ if ((info->cmd & IPP2P_XDCC) == IPP2P_XDCC) printf(" --xdcc");
+ if (info->debug != 0) printf(" --debug");
+ printf(" ");
+}
+
+
+
+static void
+save(const void *ip, const struct xt_entry_match *match)
+{
+ struct ipt_p2p_info *info = (struct ipt_p2p_info *)match->data;
+
+ if ((info->cmd & SHORT_HAND_IPP2P) == SHORT_HAND_IPP2P) printf("--ipp2p ");
+// if ((info->cmd & SHORT_HAND_DATA) == SHORT_HAND_DATA) printf("--ipp2p-data ");
+ if ((info->cmd & IPP2P_KAZAA) == IPP2P_KAZAA) printf("--kazaa ");
+// if ((info->cmd & IPP2P_DATA_KAZAA) == IPP2P_DATA_KAZAA) printf("--kazaa-data ");
+// if ((info->cmd & IPP2P_DATA_GNU) == IPP2P_DATA_GNU) printf("--gnu-data ");
+ if ((info->cmd & IPP2P_GNU) == IPP2P_GNU) printf("--gnu ");
+ if ((info->cmd & IPP2P_EDK) == IPP2P_EDK) printf("--edk ");
+// if ((info->cmd & IPP2P_DATA_EDK) == IPP2P_DATA_EDK) printf("--edk-data ");
+// if ((info->cmd & IPP2P_DATA_DC) == IPP2P_DATA_DC) printf("--dc-data ");
+ if ((info->cmd & IPP2P_DC) == IPP2P_DC) printf("--dc ");
+ if ((info->cmd & IPP2P_BIT) == IPP2P_BIT) printf("--bit ");
+ if ((info->cmd & IPP2P_APPLE) == IPP2P_APPLE) printf("--apple ");
+ if ((info->cmd & IPP2P_SOUL) == IPP2P_SOUL) printf("--soul ");
+ if ((info->cmd & IPP2P_WINMX) == IPP2P_WINMX) printf("--winmx ");
+ if ((info->cmd & IPP2P_ARES) == IPP2P_ARES) printf("--ares ");
+ if ((info->cmd & IPP2P_MUTE) == IPP2P_MUTE) printf(" --mute");
+ if ((info->cmd & IPP2P_WASTE) == IPP2P_WASTE) printf(" --waste");
+ if ((info->cmd & IPP2P_XDCC) == IPP2P_XDCC) printf(" --xdcc");
+ if (info->debug != 0) printf("--debug ");
+}
+
+
+
+
+static
+struct xtables_match ipp2p=
+{
+ .next = NULL,
+ .name = "ipp2p",
+ .version = XTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct ipt_p2p_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct ipt_p2p_info)),
+ .help = &help,
+ .init = &init,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts
+};
+
+
+
+void _init(void)
+{
+ xtables_register_match(&ipp2p);
+}
+
--- /dev/null
+#if defined(MODVERSIONS)
+#include <linux/modversions.h>
+#endif
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include "xt_ipp2p.h"
+#include "compat_xtables.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 int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+ const struct xt_match *match,
+#endif
+ const void *matchinfo,
+ int offset,
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+ const void *hdr,
+ u_int16_t datalen,
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+ unsigned int protoff,
+#endif
+
+ int *hotdrop)
+{
+ const struct ipt_p2p_info *info = matchinfo;
+ unsigned char *haystack;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
+ struct iphdr *ip = ip_hdr(skb);
+#else
+ struct iphdr *ip = skb->nh.iph;
+#endif
+ 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 int
+checkentry(const char *tablename,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
+ const void *ip,
+#else
+ const struct ipt_ip *ip,
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+ const struct xt_match *match,
+#endif
+ void *matchinfo,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+ unsigned int matchsize,
+#endif
+ 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;
+}
+
+
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
+static struct xt_match ipp2p_match = {
+#else
+static struct ipt_match ipp2p_match = {
+#endif
+#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",
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
+ .family = AF_INET,
+#endif
+ .match = &match,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
+ .matchsize = sizeof(struct ipt_p2p_info),
+#endif
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+#endif
+};
+
+
+static int __init init(void)
+{
+ printk(KERN_INFO "IPP2P v%s loading\n", IPP2P_VERSION);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
+ return xt_register_match(&ipp2p_match);
+#else
+ return ipt_register_match(&ipp2p_match);
+#endif
+}
+
+static void __exit fini(void)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
+ xt_unregister_match(&ipp2p_match);
+#else
+ ipt_unregister_match(&ipp2p_match);
+#endif
+ printk(KERN_INFO "IPP2P v%s unloaded\n", IPP2P_VERSION);
+}
+
+module_init(init);
+module_exit(fini);
+
+
projects / thirdparty / xtables-addons.git / commitdiff
