diff --git a/extensions/Kbuild b/extensions/Kbuild index 9a06eb4..82dd141 100644 --- a/extensions/Kbuild +++ b/extensions/Kbuild @@ -13,6 +13,7 @@ obj-${build_TARPIT} += xt_TARPIT.o obj-${build_TEE} += xt_TEE.o obj-${build_condition} += xt_condition.o obj-${build_geoip} += xt_geoip.o +obj-${build_ipp2p} += xt_ipp2p.o obj-${build_portscan} += xt_portscan.o -include ${M}/*.Kbuild diff --git a/extensions/Mbuild b/extensions/Mbuild index c0060a4..7f8a019 100644 --- a/extensions/Mbuild +++ b/extensions/Mbuild @@ -6,4 +6,5 @@ obj-${build_TARPIT} += libxt_TARPIT.so obj-${build_TEE} += libxt_TEE.so obj-${build_condition} += libxt_condition.so obj-${build_geoip} += libxt_geoip.so +obj-${build_ipp2p} += libxt_ipp2p.so obj-${build_portscan} += libxt_portscan.so diff --git a/extensions/libxt_ipp2p.c b/extensions/libxt_ipp2p.c new file mode 100644 index 0000000..6fed3bc --- /dev/null +++ b/extensions/libxt_ipp2p.c @@ -0,0 +1,397 @@ + +#include +#include +#include +#include +#include +#include + +#include +#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); +} + diff --git a/extensions/libxt_ipp2p.man b/extensions/libxt_ipp2p.man new file mode 100644 index 0000000..da34514 --- /dev/null +++ b/extensions/libxt_ipp2p.man @@ -0,0 +1,43 @@ +This module matches certain packets in P2P flows. It is not +designed to match all packets belonging to a P2P connection - +use IPP2P together with CONNMARK for this purpose. Also visit +http://www.ipp2p.org for detailed information. + +Use it together with -p tcp or -p udp to search these protocols +only or without -p switch to search packets of both protocols. + +IPP2P provides the following options: +.TP +.B "--edk " +Matches as many eDonkey/eMule packets as possible. +.TP +.B "--kazaa " +Matches as many KaZaA packets as possible. +.TP +.B "--gnu " +Matches as many Gnutella packets as possible. +.TP +.B "--dc " +Matches as many Direct Connect packets as possible. +.TP +.B "--bit " +Matches BitTorrent packets. +.TP +.B "--apple " +Matches AppleJuice packets. +.TP +.B "--soul " +Matches some SoulSeek packets. Considered as beta, use careful! +.TP +.B "--winmx " +Matches some WinMX packets. Considered as beta, use careful! +.TP +.B "--ares " +Matches Ares and AresLite packets. Use together with -j DROP only. +.TP +.B "--ipp2p " +Short hand for: --edk --kazaa --gnu --dc +.TP +.B "--debug " +Prints some information about each hit into kernel logfile. May +produce huge logfiles so beware! diff --git a/extensions/xt_ipp2p.Kconfig b/extensions/xt_ipp2p.Kconfig new file mode 100644 index 0000000..ef29447 --- /dev/null +++ b/extensions/xt_ipp2p.Kconfig @@ -0,0 +1,6 @@ +config NETFILTER_XT_MATCH_IPP2P + tristate '"ipp2p" match support' + depends on NETFILTER_XTABLES && NETFILTER_ADVANCED + ---help--- + This option makes possible to match some P2P packets + therefore helps controlling such traffic. diff --git a/extensions/xt_ipp2p.c b/extensions/xt_ipp2p.c new file mode 100644 index 0000000..5dc0a10 --- /dev/null +++ b/extensions/xt_ipp2p.c @@ -0,0 +1,905 @@ +#if defined(MODVERSIONS) +#include +#endif +#include +#include +#include +#include +#include +#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 "); +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); + + diff --git a/extensions/xt_ipp2p.h b/extensions/xt_ipp2p.h new file mode 100644 index 0000000..1bd3f64 --- /dev/null +++ b/extensions/xt_ipp2p.h @@ -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) diff --git a/mconfig b/mconfig index b78570e..38eedba 100644 --- a/mconfig +++ b/mconfig @@ -8,4 +8,5 @@ build_TARPIT=m build_TEE=m build_condition=m build_geoip=m +build_ipp2p=m build_portscan=m