diff options
Diffstat (limited to 'release/src/linux/linux/net/ipv4/netfilter/ipt_ipp2p.c')
| -rw-r--r-- | release/src/linux/linux/net/ipv4/netfilter/ipt_ipp2p.c | 868 |
1 files changed, 868 insertions, 0 deletions
diff --git a/release/src/linux/linux/net/ipv4/netfilter/ipt_ipp2p.c b/release/src/linux/linux/net/ipv4/netfilter/ipt_ipp2p.c new file mode 100644 index 00000000..c36b2005 --- /dev/null +++ b/release/src/linux/linux/net/ipv4/netfilter/ipt_ipp2p.c @@ -0,0 +1,868 @@ +#if defined(MODVERSIONS) +#include <linux/modversions.h> +#endif +#include <linux/module.h> +#include <linux/version.h> +#include <linux/netfilter_ipv4/ip_tables.h> +#include <linux/netfilter_ipv4/ipt_ipp2p.h> +#include <net/tcp.h> +#include <net/udp.h> + +#define get_u8(X,O) (*(__u8 *)(X + O)) +#define get_u16(X,O) (*(__u16 *)(X + O)) +#define get_u32(X,O) (*(__u32 *)(X + O)) + +MODULE_AUTHOR("Eicke Friedrich/Klaus Degner <ipp2p@ipp2p.org>"); +MODULE_DESCRIPTION("An extension to iptables to identify P2P traffic."); +MODULE_LICENSE("GPL"); + + +/*Search for UDP eDonkey/eMule/Kad commands*/ +int +udp_search_edk (unsigned char *haystack, int packet_len) +{ + unsigned char *t = haystack; + t += 8; + + switch (t[0]) { + case 0xe3: + { /*edonkey*/ + switch (t[1]) + { + /* client -> server status request */ + case 0x96: + if (packet_len == 14) return ((IPP2P_EDK * 100) + 50); + break; + /* server -> client status request */ + case 0x97: if (packet_len == 42) return ((IPP2P_EDK * 100) + 51); + break; + /* server description request */ + /* e3 2a ff f0 .. | size == 6 */ + case 0xa2: if ( (packet_len == 14) && ( get_u16(t,2) == __constant_htons(0xfff0) ) ) return ((IPP2P_EDK * 100) + 52); + break; + /* server description response */ + /* e3 a3 ff f0 .. | size > 40 && size < 200 */ + //case 0xa3: return ((IPP2P_EDK * 100) + 53); + // break; + case 0x9a: if (packet_len==26) return ((IPP2P_EDK * 100) + 54); + break; + + case 0x92: if (packet_len==18) return ((IPP2P_EDK * 100) + 55); + break; + } + break; + } + case 0xe4: + { + switch (t[1]) + { + /* e4 20 .. | size == 43 */ + case 0x20: if ((packet_len == 43) && (t[2] != 0x00) && (t[34] != 0x00)) return ((IPP2P_EDK * 100) + 60); + break; + /* e4 00 .. 00 | size == 35 ? */ + case 0x00: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 61); + break; + /* e4 10 .. 00 | size == 35 ? */ + case 0x10: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 62); + break; + /* e4 18 .. 00 | size == 35 ? */ + case 0x18: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 63); + break; + /* e4 52 .. | size = 44 */ + case 0x52: if (packet_len == 44 ) return ((IPP2P_EDK * 100) + 64); + break; + /* e4 58 .. | size == 6 */ + case 0x58: if (packet_len == 14 ) return ((IPP2P_EDK * 100) + 65); + break; + /* e4 59 .. | size == 2 */ + case 0x59: if (packet_len == 10 )return ((IPP2P_EDK * 100) + 66); + break; + /* e4 28 .. | packet_len == 52,77,102,127... */ + case 0x28: if (((packet_len-52) % 25) == 0) return ((IPP2P_EDK * 100) + 67); + break; + /* e4 50 xx xx | size == 4 */ + case 0x50: if (packet_len == 12) return ((IPP2P_EDK * 100) + 68); + break; + /* e4 40 xx xx | size == 48 */ + case 0x40: if (packet_len == 56) return ((IPP2P_EDK * 100) + 69); + break; + } + break; + } + } /* end of switch (t[0]) */ + return 0; +}/*udp_search_edk*/ + + +/*Search for UDP Gnutella commands*/ +int +udp_search_gnu (unsigned char *haystack, int packet_len) +{ + unsigned char *t = haystack; + t += 8; + + if (memcmp(t, "GND", 3) == 0) return ((IPP2P_GNU * 100) + 51); + if (memcmp(t, "GNUTELLA ", 9) == 0) return ((IPP2P_GNU * 100) + 52); + return 0; +}/*udp_search_gnu*/ + + +/*Search for UDP KaZaA commands*/ +int +udp_search_kazaa (unsigned char *haystack, int packet_len) +{ + unsigned char *t = haystack; + + if (t[packet_len-1] == 0x00){ + t += (packet_len - 6); + if (memcmp(t, "KaZaA", 5) == 0) return (IPP2P_KAZAA * 100 +50); + } + + return 0; +}/*udp_search_kazaa*/ + +/*Search for UDP DirectConnect commands*/ +int +udp_search_directconnect (unsigned char *haystack, int packet_len) +{ + unsigned char *t = haystack; + if ((*(t + 8) == 0x24) && (*(t + packet_len - 1) == 0x7c)) { + t+=8; + if (memcmp(t, "SR ", 3) == 0) return ((IPP2P_DC * 100) + 60); + if (memcmp(t, "Ping ", 5) == 0) return ((IPP2P_DC * 100) + 61); + } + return 0; +}/*udp_search_directconnect*/ + + + +/*Search for UDP BitTorrent commands*/ +int +udp_search_bit (unsigned char *haystack, int packet_len) +{ + switch(packet_len) + { + case 24: + /* ^ 00 00 04 17 27 10 19 80 */ + if ((ntohl(get_u32(haystack, 8)) == 0x00000417) && (ntohl(get_u32(haystack, 12)) == 0x27101980)) + return (IPP2P_BIT * 100 + 50); + break; + case 44: + if (get_u32(haystack, 16) == __constant_htonl(0x00000400) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) + return (IPP2P_BIT * 100 + 51); + if (get_u32(haystack, 16) == __constant_htonl(0x00000400)) + return (IPP2P_BIT * 100 + 61); + break; + case 65: + if (get_u32(haystack, 16) == __constant_htonl(0x00000404) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) + return (IPP2P_BIT * 100 + 52); + if (get_u32(haystack, 16) == __constant_htonl(0x00000404)) + return (IPP2P_BIT * 100 + 62); + break; + case 67: + if (get_u32(haystack, 16) == __constant_htonl(0x00000406) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) + return (IPP2P_BIT * 100 + 53); + if (get_u32(haystack, 16) == __constant_htonl(0x00000406)) + return (IPP2P_BIT * 100 + 63); + break; + case 211: + if (get_u32(haystack, 8) == __constant_htonl(0x00000405)) + return (IPP2P_BIT * 100 + 54); + break; + case 29: + if ((get_u32(haystack, 8) == __constant_htonl(0x00000401))) + return (IPP2P_BIT * 100 + 55); + break; + case 52: + if (get_u32(haystack,8) == __constant_htonl(0x00000827) && + get_u32(haystack,12) == __constant_htonl(0x37502950)) + return (IPP2P_BIT * 100 + 80); + break; + default: + /* this packet does not have a constant size */ + if (packet_len >= 40 && get_u32(haystack, 16) == __constant_htonl(0x00000402) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) + return (IPP2P_BIT * 100 + 56); + break; + } + + /* some extra-bitcomet rules: + * "d1:" [a|r] "d2:id20:" + */ + if (packet_len > 30 && get_u8(haystack, 8) == 'd' && get_u8(haystack, 9) == '1' && get_u8(haystack, 10) == ':' ) + { + if (get_u8(haystack, 11) == 'a' || get_u8(haystack, 11) == 'r') + { + if (memcmp(haystack+12,"d2:id20:",8)==0) + return (IPP2P_BIT * 100 + 57); + } + } + +#if 0 + /* bitlord rules */ + /* packetlen must be bigger than 40 */ + /* first 4 bytes are zero */ + if (packet_len > 40 && get_u32(haystack, 8) == 0x00000000) + { + /* first rule: 00 00 00 00 01 00 00 xx xx xx xx 00 00 00 00*/ + if (get_u32(haystack, 12) == 0x00000000 && + get_u32(haystack, 16) == 0x00010000 && + get_u32(haystack, 24) == 0x00000000 ) + return (IPP2P_BIT * 100 + 71); + + /* 00 01 00 00 0d 00 00 xx xx xx xx 00 00 00 00*/ + if (get_u32(haystack, 12) == 0x00000001 && + get_u32(haystack, 16) == 0x000d0000 && + get_u32(haystack, 24) == 0x00000000 ) + return (IPP2P_BIT * 100 + 71); + + + } +#endif + + return 0; +}/*udp_search_bit*/ + + + +/*Search for Ares commands*/ +//#define IPP2P_DEBUG_ARES +int +search_ares (const unsigned char *payload, const u16 plen) +//int search_ares (unsigned char *haystack, int packet_len, int head_len) +{ +// const unsigned char *t = haystack + head_len; + + /* all ares packets start with */ + if (payload[1] == 0 && (plen - payload[0]) == 3) + { + switch (payload[2]) + { + case 0x5a: + /* ares connect */ + if ( plen == 6 && payload[5] == 0x05 ) return ((IPP2P_ARES * 100) + 1); + break; + case 0x09: + /* ares search, min 3 chars --> 14 bytes + * lets define a search can be up to 30 chars --> max 34 bytes + */ + if ( plen >= 14 && plen <= 34 ) return ((IPP2P_ARES * 100) + 1); + break; +#ifdef IPP2P_DEBUG_ARES + default: + printk(KERN_DEBUG "Unknown Ares command %x recognized, len: %u \n", (unsigned int) payload[2],plen); +#endif /* IPP2P_DEBUG_ARES */ + } + } + +#if 0 + /* found connect packet: 03 00 5a 04 03 05 */ + /* new version ares 1.8: 03 00 5a xx xx 05 */ + if ((plen) == 6){ /* possible connect command*/ + if ((payload[0] == 0x03) && (payload[1] == 0x00) && (payload[2] == 0x5a) && (payload[5] == 0x05)) + return ((IPP2P_ARES * 100) + 1); + } + if ((plen) == 60){ /* possible download command*/ + if ((payload[59] == 0x0a) && (payload[58] == 0x0a)){ + if (memcmp(t, "PUSH SHA1:", 10) == 0) /* found download command */ + return ((IPP2P_ARES * 100) + 2); + } + } +#endif + + return 0; +} /*search_ares*/ + +/*Search for SoulSeek commands*/ +int +search_soul (const unsigned char *payload, const u16 plen) +{ +//#define IPP2P_DEBUG_SOUL + /* match: xx xx xx xx | xx = sizeof(payload) - 4 */ + if (get_u32(payload, 0) == (plen - 4)){ + const __u32 m=get_u32(payload, 4); + /* match 00 yy yy 00, yy can be everything */ + if ( get_u8(payload, 4) == 0x00 && get_u8(payload, 7) == 0x00 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "0: Soulseek command 0x%x recognized\n",get_u32(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 1); + } + + /* next match: 01 yy 00 00 | yy can be everything */ + if ( get_u8(payload, 4) == 0x01 && get_u16(payload, 6) == 0x0000 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "1: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 2); + } + + /* other soulseek commandos are: 1-5,7,9,13-18,22,23,26,28,35-37,40-46,50,51,60,62-69,91,92,1001 */ + /* try to do this in an intelligent way */ + /* get all small commandos */ + switch(m) + { + case 7: + case 9: + case 22: + case 23: + case 26: + case 28: + case 50: + case 51: + case 60: + case 91: + case 92: + case 1001: +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "2: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 3); + } + + if (m > 0 && m < 6 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "3: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 4); + } + if (m > 12 && m < 19 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "4: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 5); + } + + if (m > 34 && m < 38 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "5: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 6); + } + + if (m > 39 && m < 47 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "6: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 7); + } + + if (m > 61 && m < 70 ) + { +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "7: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 8); + } + +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "unknown SOULSEEK command: 0x%x, first 16 bit: 0x%x, first 8 bit: 0x%x ,soulseek ???\n",get_u32(payload, 4),get_u16(payload, 4) >> 16,get_u8(payload, 4) >> 24); +#endif /* IPP2P_DEBUG_SOUL */ + } + + /* match 14 00 00 00 01 yy 00 00 00 STRING(YY) 01 00 00 00 00 46|50 00 00 00 00 */ + /* without size at the beginning !!! */ + if ( get_u32(payload, 0) == 0x14 && get_u8(payload, 4) == 0x01 ) + { + __u32 y=get_u32(payload, 5); + /* we need 19 chars + string */ + if ( (y + 19) <= (plen) ) + { + const unsigned char *w=payload+9+y; + if (get_u32(w, 0) == 0x01 && ( get_u16(w, 4) == 0x4600 || get_u16(w, 4) == 0x5000) && get_u32(w, 6) == 0x00); +#ifdef IPP2P_DEBUG_SOUL + printk(KERN_DEBUG "Soulssek special client command recognized\n"); +#endif /* IPP2P_DEBUG_SOUL */ + return ((IPP2P_SOUL * 100) + 9); + } + } + return 0; +} + + +/*Search for WinMX commands*/ +int +search_winmx (const unsigned char *payload, const u16 plen) +{ +//#define IPP2P_DEBUG_WINMX + if (((plen) == 4) && (memcmp(payload, "SEND", 4) == 0)) return ((IPP2P_WINMX * 100) + 1); + if (((plen) == 3) && (memcmp(payload, "GET", 3) == 0)) return ((IPP2P_WINMX * 100) + 2); + //if (packet_len < (head_len + 10)) return 0; + if (plen < 10) return 0; + + if ((memcmp(payload, "SEND", 4) == 0) || (memcmp(payload, "GET", 3) == 0)){ + u16 c=4; + const u16 end=plen-2; + u8 count=0; + while (c < end) + { + if (payload[c]== 0x20 && payload[c+1] == 0x22) + { + c++; + count++; + if (count>=2) return ((IPP2P_WINMX * 100) + 3); + } + c++; + } + } + + if ( plen == 149 && payload[0] == '8' ) + { +#ifdef IPP2P_DEBUG_WINMX + printk(KERN_INFO "maybe WinMX\n"); +#endif + if (get_u32(payload,17) == 0 && get_u32(payload,21) == 0 && get_u32(payload,25) == 0 && +// get_u32(payload,33) == __constant_htonl(0x71182b1a) && get_u32(payload,37) == __constant_htonl(0x05050000) && +// get_u32(payload,133) == __constant_htonl(0x31097edf) && get_u32(payload,145) == __constant_htonl(0xdcb8f792)) + get_u16(payload,39) == 0 && get_u16(payload,135) == __constant_htons(0x7edf) && get_u16(payload,147) == __constant_htons(0xf792)) + + { +#ifdef IPP2P_DEBUG_WINMX + printk(KERN_INFO "got WinMX\n"); +#endif + return ((IPP2P_WINMX * 100) + 4); + } + } + return 0; +} /*search_winmx*/ + + +/*Search for appleJuice commands*/ +int +search_apple (const unsigned char *payload, const u16 plen) +{ + if ( (plen > 7) && (payload[6] == 0x0d) && (payload[7] == 0x0a) && (memcmp(payload, "ajprot", 6) == 0)) return (IPP2P_APPLE * 100); + + return 0; +} + + +/*Search for BitTorrent commands*/ +int +search_bittorrent (const unsigned char *payload, const u16 plen) +{ + if (plen > 20) + { + /* test for match 0x13+"BitTorrent protocol" */ + if (payload[0] == 0x13) + { + if (memcmp(payload+1, "BitTorrent protocol", 19) == 0) return (IPP2P_BIT * 100); + } + + /* get tracker commandos, all starts with GET / + * then it can follow: scrape| announce + * and then ?hash_info= + */ + if (memcmp(payload,"GET /",5) == 0) + { + /* message scrape */ + if ( memcmp(payload+5,"scrape?info_hash=",17)==0 ) return (IPP2P_BIT * 100 + 1); + /* message announce */ + if ( memcmp(payload+5,"announce?info_hash=",19)==0 ) return (IPP2P_BIT * 100 + 2); + } + } + else + { + /* bitcomet encryptes the first packet, so we have to detect another + * one later in the flow */ + /* first try failed, too many missdetections */ + //if ( size == 5 && get_u32(t,0) == __constant_htonl(1) && t[4] < 3) return (IPP2P_BIT * 100 + 3); + + /* second try: block request packets */ + if ( plen == 17 && get_u32(payload,0) == __constant_htonl(0x0d) && payload[4] == 0x06 && get_u32(payload,13) == __constant_htonl(0x4000) ) return (IPP2P_BIT * 100 + 3); + } + + return 0; +} + + + +/*check for Kazaa get command*/ +int +search_kazaa (const unsigned char *payload, const u16 plen) + +{ + if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a) && memcmp(payload, "GET /.hash=", 11) == 0) + return (IPP2P_DATA_KAZAA * 100); + + return 0; +} + + +/*check for gnutella get command*/ +int +search_gnu (const unsigned char *payload, const u16 plen) +{ + if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a)) + { + if (memcmp(payload, "GET /get/", 9) == 0) return ((IPP2P_DATA_GNU * 100) + 1); + if (memcmp(payload, "GET /uri-res/", 13) == 0) return ((IPP2P_DATA_GNU * 100) + 2); + } + return 0; +} + + +/*check for gnutella get commands and other typical data*/ +int +search_all_gnu (const unsigned char *payload, const u16 plen) +{ + + if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a)) + { + + if (memcmp(payload, "GNUTELLA CONNECT/", 17) == 0) return ((IPP2P_GNU * 100) + 1); + if (memcmp(payload, "GNUTELLA/", 9) == 0) return ((IPP2P_GNU * 100) + 2); + + + if ((memcmp(payload, "GET /get/", 9) == 0) || (memcmp(payload, "GET /uri-res/", 13) == 0)) + { + u16 c=8; + const u16 end=plen-22; + while (c < end) { + if ( payload[c] == 0x0a && payload[c+1] == 0x0d && ((memcmp(&payload[c+2], "X-Gnutella-", 11) == 0) || (memcmp(&payload[c+2], "X-Queue:", 8) == 0))) + return ((IPP2P_GNU * 100) + 3); + c++; + } + } + } + return 0; +} + + +/*check for KaZaA download commands and other typical data*/ +int +search_all_kazaa (const unsigned char *payload, const u16 plen) +{ + if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a)) + { + + if (memcmp(payload, "GIVE ", 5) == 0) return ((IPP2P_KAZAA * 100) + 1); + + if (memcmp(payload, "GET /", 5) == 0) { + u16 c = 8; + const u16 end=plen-22; + while (c < end) { + if ( payload[c] == 0x0a && payload[c+1] == 0x0d && ((memcmp(&payload[c+2], "X-Kazaa-Username: ", 18) == 0) || (memcmp(&payload[c+2], "User-Agent: PeerEnabler/", 24) == 0))) + return ((IPP2P_KAZAA * 100) + 2); + c++; + } + } + } + return 0; +} + +/*fast check for edonkey file segment transfer command*/ +int +search_edk (const unsigned char *payload, const u16 plen) +{ + if (payload[0] != 0xe3) + return 0; + else { + if (payload[5] == 0x47) + return (IPP2P_DATA_EDK * 100); + else + return 0; + } +} + + + +/*intensive but slower search for some edonkey packets including size-check*/ +int +search_all_edk (const unsigned char *payload, const u16 plen) +{ + if (payload[0] != 0xe3) + return 0; + else { + //t += head_len; + const u16 cmd = get_u16(payload, 1); + if (cmd == (plen - 5)) { + switch (payload[5]) { + case 0x01: return ((IPP2P_EDK * 100) + 1); /*Client: hello or Server:hello*/ + case 0x4c: return ((IPP2P_EDK * 100) + 9); /*Client: Hello-Answer*/ + } + } + return 0; + } +} + + +/*fast check for Direct Connect send command*/ +int +search_dc (const unsigned char *payload, const u16 plen) +{ + + if (payload[0] != 0x24 ) + return 0; + else { + if (memcmp(&payload[1], "Send|", 5) == 0) + return (IPP2P_DATA_DC * 100); + else + return 0; + } + +} + + +/*intensive but slower check for all direct connect packets*/ +int +search_all_dc (const unsigned char *payload, const u16 plen) +{ +// unsigned char *t = haystack; + + if (payload[0] == 0x24 && payload[plen-1] == 0x7c) + { + const unsigned char *t=&payload[1]; + /* Client-Hub-Protocol */ + if (memcmp(t, "Lock ", 5) == 0) return ((IPP2P_DC * 100) + 1); + /* Client-Client-Protocol, some are already recognized by client-hub (like lock) */ + if (memcmp(t, "MyNick ", 7) == 0) return ((IPP2P_DC * 100) + 38); + } + return 0; +} + +/*check for mute*/ +int +search_mute (const unsigned char *payload, const u16 plen) +{ + if ( plen == 209 || plen == 345 || plen == 473 || plen == 609 || plen == 1121 ) + { + //printk(KERN_DEBUG "size hit: %u",size); + if (memcmp(payload,"PublicKey: ",11) == 0 ) + { + return ((IPP2P_MUTE * 100) + 0); + +/* if (memcmp(t+size-14,"\x0aEndPublicKey\x0a",14) == 0) + { + printk(KERN_DEBUG "end pubic key hit: %u",size); + + }*/ + } + } + return 0; +} + + +/* check for xdcc */ +int +search_xdcc (const unsigned char *payload, const u16 plen) +{ + /* search in small packets only */ + if (plen > 20 && plen < 200 && payload[plen-1] == 0x0a && payload[plen-2] == 0x0d && memcmp(payload,"PRIVMSG ",8) == 0) + { + + u16 x=10; + const u16 end=plen - 13; + + /* is seems to be a irc private massage, chedck for xdcc command */ + while (x < end) + { + if (payload[x] == ':') + { + if ( memcmp(&payload[x+1],"xdcc send #",11) == 0 ) + return ((IPP2P_XDCC * 100) + 0); + } + x++; + } + } + return 0; +} + +/* search for waste */ +int search_waste(const unsigned char *payload, const u16 plen) +{ + if ( plen >= 8 && memcmp(payload,"GET.sha1:",9) == 0) + return ((IPP2P_WASTE * 100) + 0); + + return 0; +} + + +static struct { + int command; + __u8 short_hand; /*for fucntions included in short hands*/ + int packet_len; + int (*function_name) (const unsigned char *, const u16); +} matchlist[] = { + {IPP2P_EDK,SHORT_HAND_IPP2P,20, &search_all_edk}, +// {IPP2P_DATA_KAZAA,SHORT_HAND_DATA,200, &search_kazaa}, +// {IPP2P_DATA_EDK,SHORT_HAND_DATA,60, &search_edk}, +// {IPP2P_DATA_DC,SHORT_HAND_DATA,26, &search_dc}, + {IPP2P_DC,SHORT_HAND_IPP2P,5, search_all_dc}, +// {IPP2P_DATA_GNU,SHORT_HAND_DATA,40, &search_gnu}, + {IPP2P_GNU,SHORT_HAND_IPP2P,5, &search_all_gnu}, + {IPP2P_KAZAA,SHORT_HAND_IPP2P,5, &search_all_kazaa}, + {IPP2P_BIT,SHORT_HAND_IPP2P,20, &search_bittorrent}, + {IPP2P_APPLE,SHORT_HAND_IPP2P,5, &search_apple}, + {IPP2P_SOUL,SHORT_HAND_IPP2P,5, &search_soul}, + {IPP2P_WINMX,SHORT_HAND_IPP2P,2, &search_winmx}, + {IPP2P_ARES,SHORT_HAND_IPP2P,5, &search_ares}, + {IPP2P_MUTE,SHORT_HAND_NONE,200, &search_mute}, + {IPP2P_WASTE,SHORT_HAND_NONE,5, &search_waste}, + {IPP2P_XDCC,SHORT_HAND_NONE,5, &search_xdcc}, + {0,0,0,NULL} +}; + + +static struct { + int command; + __u8 short_hand; /*for fucntions included in short hands*/ + int packet_len; + int (*function_name) (unsigned char *, int); +} udp_list[] = { + {IPP2P_KAZAA,SHORT_HAND_IPP2P,14, &udp_search_kazaa}, + {IPP2P_BIT,SHORT_HAND_IPP2P,23, &udp_search_bit}, + {IPP2P_GNU,SHORT_HAND_IPP2P,11, &udp_search_gnu}, + {IPP2P_EDK,SHORT_HAND_IPP2P,9, &udp_search_edk}, + {IPP2P_DC,SHORT_HAND_IPP2P,12, &udp_search_directconnect}, + {0,0,0,NULL} +}; + + +static 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*/ + + 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, + 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); + + |