target/linux/generic-2.6/patches/110-ipp2p_0.8.1rc1.patch

   1 Index: linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_ipp2p.h
   2 ===================================================================
   3 --- /dev/null
   4 +++ linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_ipp2p.h
   5 @@ -0,0 +1,31 @@
   6 +#ifndef __IPT_IPP2P_H
   7 +#define __IPT_IPP2P_H
   8 +#define IPP2P_VERSION "0.8.1_rc1"
   9 +
  10 +struct ipt_p2p_info {
  11 +    int cmd;
  12 +    int debug;
  13 +};
  14 +
  15 +#endif //__IPT_IPP2P_H
  16 +
  17 +#define SHORT_HAND_IPP2P       1 /* --ipp2p switch*/
  18 +//#define SHORT_HAND_DATA              4 /* --ipp2p-data switch*/
  19 +#define SHORT_HAND_NONE                5 /* no short hand*/
  20 +
  21 +#define IPP2P_EDK              (1 << 1)
  22 +#define IPP2P_DATA_KAZAA       (1 << 2)
  23 +#define IPP2P_DATA_EDK         (1 << 3)
  24 +#define IPP2P_DATA_DC          (1 << 4)
  25 +#define IPP2P_DC               (1 << 5)
  26 +#define IPP2P_DATA_GNU         (1 << 6)
  27 +#define IPP2P_GNU              (1 << 7)
  28 +#define IPP2P_KAZAA            (1 << 8)
  29 +#define IPP2P_BIT              (1 << 9)
  30 +#define IPP2P_APPLE            (1 << 10)
  31 +#define IPP2P_SOUL             (1 << 11)
  32 +#define IPP2P_WINMX            (1 << 12)
  33 +#define IPP2P_ARES             (1 << 13)
  34 +#define IPP2P_MUTE             (1 << 14)
  35 +#define IPP2P_WASTE            (1 << 15)
  36 +#define IPP2P_XDCC             (1 << 16)
  37 Index: linux-2.6.21.7/net/ipv4/netfilter/ipt_ipp2p.c
  38 ===================================================================
  39 --- /dev/null
  40 +++ linux-2.6.21.7/net/ipv4/netfilter/ipt_ipp2p.c
  41 @@ -0,0 +1,882 @@
  42 +#if defined(MODVERSIONS)
  43 +#include <linux/modversions.h>
  44 +#endif
  45 +#include <linux/module.h>
  46 +#include <linux/netfilter_ipv4/ip_tables.h>
  47 +#include <linux/version.h>
  48 +#include <linux/netfilter_ipv4/ipt_ipp2p.h>
  49 +#include <net/tcp.h>
  50 +#include <net/udp.h>
  51 +
  52 +#define get_u8(X,O)  (*(__u8 *)(X + O))
  53 +#define get_u16(X,O)  (*(__u16 *)(X + O))
  54 +#define get_u32(X,O)  (*(__u32 *)(X + O))
  55 +
  56 +MODULE_AUTHOR("Eicke Friedrich/Klaus Degner <ipp2p@ipp2p.org>");
  57 +MODULE_DESCRIPTION("An extension to iptables to identify P2P traffic.");
  58 +MODULE_LICENSE("GPL");
  59 +
  60 +
  61 +/*Search for UDP eDonkey/eMule/Kad commands*/
  62 +int
  63 +udp_search_edk (unsigned char *haystack, int packet_len)
  64 +{
  65 +    unsigned char *t = haystack;
  66 +    t += 8;
  67 +
  68 +       switch (t[0]) {
  69 +               case 0xe3:
  70 +               {       /*edonkey*/
  71 +                       switch (t[1])
  72 +                       {
  73 +                               /* client -> server status request */
  74 +                               case 0x96:
  75 +                                       if (packet_len == 14) return ((IPP2P_EDK * 100) + 50);
  76 +                                       break;
  77 +                               /* server -> client status request */
  78 +                               case 0x97: if (packet_len == 42) return ((IPP2P_EDK * 100) + 51);
  79 +                                       break;
  80 +                                               /* server description request */
  81 +                                               /* e3 2a ff f0 .. | size == 6 */
  82 +                               case 0xa2: if ( (packet_len == 14) && ( get_u16(t,2) == __constant_htons(0xfff0) ) ) return ((IPP2P_EDK * 100) + 52);
  83 +                                       break;
  84 +                                               /* server description response */
  85 +                                               /* e3 a3 ff f0 ..  | size > 40 && size < 200 */
  86 +                               //case 0xa3: return ((IPP2P_EDK * 100) + 53);
  87 +                               //      break;
  88 +                               case 0x9a: if (packet_len==26) return ((IPP2P_EDK * 100) + 54);
  89 +                                       break;
  90 +
  91 +                               case 0x92: if (packet_len==18) return ((IPP2P_EDK * 100) + 55);
  92 +                                       break;
  93 +                       }
  94 +                       break;
  95 +               }
  96 +               case 0xe4:
  97 +               {
  98 +                       switch (t[1])
  99 +                       {
 100 +                                               /* e4 20 .. | size == 43 */
 101 +                               case 0x20: if ((packet_len == 43) && (t[2] != 0x00) && (t[34] != 0x00)) return ((IPP2P_EDK * 100) + 60);
 102 +                                       break;
 103 +                                               /* e4 00 .. 00 | size == 35 ? */
 104 +                               case 0x00: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 61);
 105 +                                       break;
 106 +                                               /* e4 10 .. 00 | size == 35 ? */
 107 +                               case 0x10: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 62);
 108 +                                       break;
 109 +                                               /* e4 18 .. 00 | size == 35 ? */
 110 +                               case 0x18: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 63);
 111 +                                       break;
 112 +                                               /* e4 52 .. | size = 44 */
 113 +                               case 0x52: if (packet_len == 44 ) return ((IPP2P_EDK * 100) + 64);
 114 +                                       break;
 115 +                                               /* e4 58 .. | size == 6 */
 116 +                               case 0x58: if (packet_len == 14 ) return ((IPP2P_EDK * 100) + 65);
 117 +                                       break;
 118 +                                               /* e4 59 .. | size == 2 */
 119 +                               case 0x59: if (packet_len == 10 )return ((IPP2P_EDK * 100) + 66);
 120 +                                       break;
 121 +                                       /* e4 28 .. | packet_len == 52,77,102,127... */
 122 +                               case 0x28: if (((packet_len-52) % 25) == 0) return ((IPP2P_EDK * 100) + 67);
 123 +                                       break;
 124 +                                       /* e4 50 xx xx | size == 4 */
 125 +                               case 0x50: if (packet_len == 12) return ((IPP2P_EDK * 100) + 68);
 126 +                                       break;
 127 +                                       /* e4 40 xx xx | size == 48 */
 128 +                               case 0x40: if (packet_len == 56) return ((IPP2P_EDK * 100) + 69);
 129 +                                       break;
 130 +                       }
 131 +                       break;
 132 +               }
 133 +       } /* end of switch (t[0]) */
 134 +    return 0;
 135 +}/*udp_search_edk*/
 136 +
 137 +
 138 +/*Search for UDP Gnutella commands*/
 139 +int
 140 +udp_search_gnu (unsigned char *haystack, int packet_len)
 141 +{
 142 +    unsigned char *t = haystack;
 143 +    t += 8;
 144 +
 145 +    if (memcmp(t, "GND", 3) == 0) return ((IPP2P_GNU * 100) + 51);
 146 +    if (memcmp(t, "GNUTELLA ", 9) == 0) return ((IPP2P_GNU * 100) + 52);
 147 +    return 0;
 148 +}/*udp_search_gnu*/
 149 +
 150 +
 151 +/*Search for UDP KaZaA commands*/
 152 +int
 153 +udp_search_kazaa (unsigned char *haystack, int packet_len)
 154 +{
 155 +    unsigned char *t = haystack;
 156 +
 157 +    if (t[packet_len-1] == 0x00){
 158 +       t += (packet_len - 6);
 159 +       if (memcmp(t, "KaZaA", 5) == 0) return (IPP2P_KAZAA * 100 +50);
 160 +    }
 161 +
 162 +    return 0;
 163 +}/*udp_search_kazaa*/
 164 +
 165 +/*Search for UDP DirectConnect commands*/
 166 +int
 167 +udp_search_directconnect (unsigned char *haystack, int packet_len)
 168 +{
 169 +    unsigned char *t = haystack;
 170 +    if ((*(t + 8) == 0x24) && (*(t + packet_len - 1) == 0x7c)) {
 171 +       t+=8;
 172 +       if (memcmp(t, "SR ", 3) == 0)                   return ((IPP2P_DC * 100) + 60);
 173 +       if (memcmp(t, "Ping ", 5) == 0)                 return ((IPP2P_DC * 100) + 61);
 174 +    }
 175 +    return 0;
 176 +}/*udp_search_directconnect*/
 177 +
 178 +
 179 +
 180 +/*Search for UDP BitTorrent commands*/
 181 +int
 182 +udp_search_bit (unsigned char *haystack, int packet_len)
 183 +{
 184 +       switch(packet_len)
 185 +       {
 186 +               case 24:
 187 +                       /* ^ 00 00 04 17 27 10 19 80 */
 188 +                       if ((ntohl(get_u32(haystack, 8)) == 0x00000417) && (ntohl(get_u32(haystack, 12)) == 0x27101980))
 189 +                               return (IPP2P_BIT * 100 + 50);
 190 +                       break;
 191 +               case 44:
 192 +                       if (get_u32(haystack, 16) == __constant_htonl(0x00000400) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
 193 +                               return (IPP2P_BIT * 100 + 51);
 194 +                       if (get_u32(haystack, 16) == __constant_htonl(0x00000400))
 195 +                               return (IPP2P_BIT * 100 + 61);
 196 +                       break;
 197 +               case 65:
 198 +                       if (get_u32(haystack, 16) == __constant_htonl(0x00000404) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
 199 +                               return (IPP2P_BIT * 100 + 52);
 200 +                       if (get_u32(haystack, 16) == __constant_htonl(0x00000404))
 201 +                               return (IPP2P_BIT * 100 + 62);
 202 +                       break;
 203 +               case 67:
 204 +                       if (get_u32(haystack, 16) == __constant_htonl(0x00000406) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
 205 +                               return (IPP2P_BIT * 100 + 53);
 206 +                       if (get_u32(haystack, 16) == __constant_htonl(0x00000406))
 207 +                               return (IPP2P_BIT * 100 + 63);
 208 +                       break;
 209 +               case 211:
 210 +                       if (get_u32(haystack, 8) == __constant_htonl(0x00000405))
 211 +                               return (IPP2P_BIT * 100 + 54);
 212 +                       break;
 213 +               case 29:
 214 +                       if ((get_u32(haystack, 8) == __constant_htonl(0x00000401)))
 215 +                               return (IPP2P_BIT * 100 + 55);
 216 +                       break;
 217 +               case 52:
 218 +                       if (get_u32(haystack,8)  == __constant_htonl(0x00000827) &&
 219 +                       get_u32(haystack,12) == __constant_htonl(0x37502950))
 220 +                               return (IPP2P_BIT * 100 + 80);
 221 +                       break;
 222 +               default:
 223 +                       /* this packet does not have a constant size */
 224 +                       if (packet_len >= 40 && get_u32(haystack, 16) == __constant_htonl(0x00000402) && get_u32(haystack, 36) == __constant_htonl(0x00000104))
 225 +                               return (IPP2P_BIT * 100 + 56);
 226 +                       break;
 227 +       }
 228 +
 229 +       /* some extra-bitcomet rules:
 230 +       * "d1:" [a|r] "d2:id20:"
 231 +       */
 232 +       if (packet_len > 30 && get_u8(haystack, 8) == 'd' && get_u8(haystack, 9) == '1' && get_u8(haystack, 10) == ':' )
 233 +       {
 234 +               if (get_u8(haystack, 11) == 'a' || get_u8(haystack, 11) == 'r')
 235 +               {
 236 +                       if (memcmp(haystack+12,"d2:id20:",8)==0)
 237 +                               return (IPP2P_BIT * 100 + 57);
 238 +               }
 239 +       }
 240 +
 241 +#if 0
 242 +       /* bitlord rules */
 243 +       /* packetlen must be bigger than 40 */
 244 +       /* first 4 bytes are zero */
 245 +       if (packet_len > 40 && get_u32(haystack, 8) == 0x00000000)
 246 +       {
 247 +               /* first rule: 00 00 00 00 01 00 00 xx xx xx xx 00 00 00 00*/
 248 +               if (get_u32(haystack, 12) == 0x00000000 &&
 249 +                   get_u32(haystack, 16) == 0x00010000 &&
 250 +                   get_u32(haystack, 24) == 0x00000000 )
 251 +                       return (IPP2P_BIT * 100 + 71);
 252 +
 253 +               /* 00 01 00 00 0d 00 00 xx xx xx xx 00 00 00 00*/
 254 +               if (get_u32(haystack, 12) == 0x00000001 &&
 255 +                   get_u32(haystack, 16) == 0x000d0000 &&
 256 +                   get_u32(haystack, 24) == 0x00000000 )
 257 +                       return (IPP2P_BIT * 100 + 71);
 258 +
 259 +
 260 +       }
 261 +#endif
 262 +
 263 +    return 0;
 264 +}/*udp_search_bit*/
 265 +
 266 +
 267 +
 268 +/*Search for Ares commands*/
 269 +//#define IPP2P_DEBUG_ARES
 270 +int
 271 +search_ares (const unsigned char *payload, const u16 plen)
 272 +//int search_ares (unsigned char *haystack, int packet_len, int head_len)
 273 +{
 274 +//     const unsigned char *t = haystack + head_len;
 275 +
 276 +       /* all ares packets start with  */
 277 +       if (payload[1] == 0 && (plen - payload[0]) == 3)
 278 +       {
 279 +               switch (payload[2])
 280 +               {
 281 +                       case 0x5a:
 282 +                               /* ares connect */
 283 +                               if ( plen == 6 && payload[5] == 0x05 ) return ((IPP2P_ARES * 100) + 1);
 284 +                               break;
 285 +                       case 0x09:
 286 +                               /* ares search, min 3 chars --> 14 bytes
 287 +                                * lets define a search can be up to 30 chars --> max 34 bytes
 288 +                                */
 289 +                               if ( plen >= 14 && plen <= 34 ) return ((IPP2P_ARES * 100) + 1);
 290 +                               break;
 291 +#ifdef IPP2P_DEBUG_ARES
 292 +                       default:
 293 +                       printk(KERN_DEBUG "Unknown Ares command %x recognized, len: %u \n", (unsigned int) payload[2],plen);
 294 +#endif /* IPP2P_DEBUG_ARES */
 295 +               }
 296 +       }
 297 +
 298 +#if 0
 299 +       /* found connect packet: 03 00 5a 04 03 05 */
 300 +       /* new version ares 1.8: 03 00 5a xx xx 05 */
 301 +    if ((plen) == 6){  /* possible connect command*/
 302 +       if ((payload[0] == 0x03) && (payload[1] == 0x00) && (payload[2] == 0x5a) && (payload[5] == 0x05))
 303 +           return ((IPP2P_ARES * 100) + 1);
 304 +    }
 305 +    if ((plen) == 60){ /* possible download command*/
 306 +       if ((payload[59] == 0x0a) && (payload[58] == 0x0a)){
 307 +           if (memcmp(t, "PUSH SHA1:", 10) == 0) /* found download command */
 308 +               return ((IPP2P_ARES * 100) + 2);
 309 +       }
 310 +    }
 311 +#endif
 312 +
 313 +    return 0;
 314 +} /*search_ares*/
 315 +
 316 +/*Search for SoulSeek commands*/
 317 +int
 318 +search_soul (const unsigned char *payload, const u16 plen)
 319 +{
 320 +//#define IPP2P_DEBUG_SOUL
 321 +    /* match: xx xx xx xx | xx = sizeof(payload) - 4 */
 322 +    if (get_u32(payload, 0) == (plen - 4)){
 323 +       const __u32 m=get_u32(payload, 4);
 324 +       /* match 00 yy yy 00, yy can be everything */
 325 +        if ( get_u8(payload, 4) == 0x00 && get_u8(payload, 7) == 0x00 )
 326 +       {
 327 +#ifdef IPP2P_DEBUG_SOUL
 328 +       printk(KERN_DEBUG "0: Soulseek command 0x%x recognized\n",get_u32(payload, 4));
 329 +#endif /* IPP2P_DEBUG_SOUL */
 330 +               return ((IPP2P_SOUL * 100) + 1);
 331 +       }
 332 +
 333 +        /* next match: 01 yy 00 00 | yy can be everything */
 334 +        if ( get_u8(payload, 4) == 0x01 && get_u16(payload, 6) == 0x0000 )
 335 +       {
 336 +#ifdef IPP2P_DEBUG_SOUL
 337 +       printk(KERN_DEBUG "1: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 338 +#endif /* IPP2P_DEBUG_SOUL */
 339 +               return ((IPP2P_SOUL * 100) + 2);
 340 +       }
 341 +
 342 +       /* 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 */
 343 +       /* try to do this in an intelligent way */
 344 +       /* get all small commandos */
 345 +       switch(m)
 346 +       {
 347 +               case 7:
 348 +               case 9:
 349 +               case 22:
 350 +               case 23:
 351 +               case 26:
 352 +               case 28:
 353 +               case 50:
 354 +               case 51:
 355 +               case 60:
 356 +               case 91:
 357 +               case 92:
 358 +               case 1001:
 359 +#ifdef IPP2P_DEBUG_SOUL
 360 +               printk(KERN_DEBUG "2: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 361 +#endif /* IPP2P_DEBUG_SOUL */
 362 +               return ((IPP2P_SOUL * 100) + 3);
 363 +       }
 364 +
 365 +       if (m > 0 && m < 6 )
 366 +       {
 367 +#ifdef IPP2P_DEBUG_SOUL
 368 +               printk(KERN_DEBUG "3: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 369 +#endif /* IPP2P_DEBUG_SOUL */
 370 +               return ((IPP2P_SOUL * 100) + 4);
 371 +       }
 372 +       if (m > 12 && m < 19 )
 373 +       {
 374 +#ifdef IPP2P_DEBUG_SOUL
 375 +               printk(KERN_DEBUG "4: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 376 +#endif /* IPP2P_DEBUG_SOUL */
 377 +               return ((IPP2P_SOUL * 100) + 5);
 378 +       }
 379 +
 380 +       if (m > 34 && m < 38 )
 381 +       {
 382 +#ifdef IPP2P_DEBUG_SOUL
 383 +               printk(KERN_DEBUG "5: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 384 +#endif /* IPP2P_DEBUG_SOUL */
 385 +               return ((IPP2P_SOUL * 100) + 6);
 386 +       }
 387 +
 388 +       if (m > 39 && m < 47 )
 389 +       {
 390 +#ifdef IPP2P_DEBUG_SOUL
 391 +               printk(KERN_DEBUG "6: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 392 +#endif /* IPP2P_DEBUG_SOUL */
 393 +               return ((IPP2P_SOUL * 100) + 7);
 394 +       }
 395 +
 396 +       if (m > 61 && m < 70 )
 397 +       {
 398 +#ifdef IPP2P_DEBUG_SOUL
 399 +               printk(KERN_DEBUG "7: Soulseek command 0x%x recognized\n",get_u16(payload, 4));
 400 +#endif /* IPP2P_DEBUG_SOUL */
 401 +               return ((IPP2P_SOUL * 100) + 8);
 402 +       }
 403 +
 404 +#ifdef IPP2P_DEBUG_SOUL
 405 +       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);
 406 +#endif /* IPP2P_DEBUG_SOUL */
 407 +    }
 408 +
 409 +       /* match 14 00 00 00 01 yy 00 00 00 STRING(YY) 01 00 00 00 00 46|50 00 00 00 00 */
 410 +       /* without size at the beginning !!! */
 411 +       if ( get_u32(payload, 0) == 0x14 && get_u8(payload, 4) == 0x01 )
 412 +       {
 413 +               __u32 y=get_u32(payload, 5);
 414 +               /* we need 19 chars + string */
 415 +               if ( (y + 19) <= (plen) )
 416 +               {
 417 +                       const unsigned char *w=payload+9+y;
 418 +                       if (get_u32(w, 0) == 0x01 && ( get_u16(w, 4) == 0x4600 || get_u16(w, 4) == 0x5000) && get_u32(w, 6) == 0x00);
 419 +#ifdef IPP2P_DEBUG_SOUL
 420 +                       printk(KERN_DEBUG "Soulssek special client command recognized\n");
 421 +#endif /* IPP2P_DEBUG_SOUL */
 422 +                       return ((IPP2P_SOUL * 100) + 9);
 423 +               }
 424 +       }
 425 +    return 0;
 426 +}
 427 +
 428 +
 429 +/*Search for WinMX commands*/
 430 +int
 431 +search_winmx (const unsigned char *payload, const u16 plen)
 432 +{
 433 +//#define IPP2P_DEBUG_WINMX
 434 +    if (((plen) == 4) && (memcmp(payload, "SEND", 4) == 0))  return ((IPP2P_WINMX * 100) + 1);
 435 +    if (((plen) == 3) && (memcmp(payload, "GET", 3) == 0))  return ((IPP2P_WINMX * 100) + 2);
 436 +    //if (packet_len < (head_len + 10)) return 0;
 437 +    if (plen < 10) return 0;
 438 +
 439 +    if ((memcmp(payload, "SEND", 4) == 0) || (memcmp(payload, "GET", 3) == 0)){
 440 +        u16 c=4;
 441 +        const u16 end=plen-2;
 442 +        u8 count=0;
 443 +        while (c < end)
 444 +        {
 445 +               if (payload[c]== 0x20 && payload[c+1] == 0x22)
 446 +               {
 447 +                       c++;
 448 +                       count++;
 449 +                       if (count>=2) return ((IPP2P_WINMX * 100) + 3);
 450 +               }
 451 +               c++;
 452 +        }
 453 +    }
 454 +
 455 +    if ( plen == 149 && payload[0] == '8' )
 456 +    {
 457 +#ifdef IPP2P_DEBUG_WINMX
 458 +       printk(KERN_INFO "maybe WinMX\n");
 459 +#endif
 460 +       if (get_u32(payload,17) == 0 && get_u32(payload,21) == 0 && get_u32(payload,25) == 0 &&
 461 +//         get_u32(payload,33) == __constant_htonl(0x71182b1a) && get_u32(payload,37) == __constant_htonl(0x05050000) &&
 462 +//         get_u32(payload,133) == __constant_htonl(0x31097edf) && get_u32(payload,145) == __constant_htonl(0xdcb8f792))
 463 +           get_u16(payload,39) == 0 && get_u16(payload,135) == __constant_htons(0x7edf) && get_u16(payload,147) == __constant_htons(0xf792))
 464 +
 465 +       {
 466 +#ifdef IPP2P_DEBUG_WINMX
 467 +               printk(KERN_INFO "got WinMX\n");
 468 +#endif
 469 +               return ((IPP2P_WINMX * 100) + 4);
 470 +       }
 471 +    }
 472 +    return 0;
 473 +} /*search_winmx*/
 474 +
 475 +
 476 +/*Search for appleJuice commands*/
 477 +int
 478 +search_apple (const unsigned char *payload, const u16 plen)
 479 +{
 480 +    if ( (plen > 7) && (payload[6] == 0x0d) && (payload[7] == 0x0a) && (memcmp(payload, "ajprot", 6) == 0))  return (IPP2P_APPLE * 100);
 481 +
 482 +    return 0;
 483 +}
 484 +
 485 +
 486 +/*Search for BitTorrent commands*/
 487 +int
 488 +search_bittorrent (const unsigned char *payload, const u16 plen)
 489 +{
 490 +    if (plen > 20)
 491 +    {
 492 +       /* test for match 0x13+"BitTorrent protocol" */
 493 +       if (payload[0] == 0x13)
 494 +       {
 495 +               if (memcmp(payload+1, "BitTorrent protocol", 19) == 0) return (IPP2P_BIT * 100);
 496 +       }
 497 +
 498 +       /* get tracker commandos, all starts with GET /
 499 +       * then it can follow: scrape| announce
 500 +       * and then ?hash_info=
 501 +       */
 502 +       if (memcmp(payload,"GET /",5) == 0)
 503 +       {
 504 +               /* message scrape */
 505 +               if ( memcmp(payload+5,"scrape?info_hash=",17)==0 ) return (IPP2P_BIT * 100 + 1);
 506 +               /* message announce */
 507 +               if ( memcmp(payload+5,"announce?info_hash=",19)==0 ) return (IPP2P_BIT * 100 + 2);
 508 +       }
 509 +    }
 510 +    else
 511 +    {
 512 +       /* bitcomet encryptes the first packet, so we have to detect another
 513 +        * one later in the flow */
 514 +        /* first try failed, too many missdetections */
 515 +       //if ( size == 5 && get_u32(t,0) == __constant_htonl(1) && t[4] < 3) return (IPP2P_BIT * 100 + 3);
 516 +
 517 +       /* second try: block request packets */
 518 +       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);
 519 +    }
 520 +
 521 +    return 0;
 522 +}
 523 +
 524 +
 525 +
 526 +/*check for Kazaa get command*/
 527 +int
 528 +search_kazaa (const unsigned char *payload, const u16 plen)
 529 +
 530 +{
 531 +    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a) && memcmp(payload, "GET /.hash=", 11) == 0)
 532 +       return (IPP2P_DATA_KAZAA * 100);
 533 +
 534 +    return 0;
 535 +}
 536 +
 537 +
 538 +/*check for gnutella get command*/
 539 +int
 540 +search_gnu (const unsigned char *payload, const u16 plen)
 541 +{
 542 +    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a))
 543 +    {
 544 +       if (memcmp(payload, "GET /get/", 9) == 0)       return ((IPP2P_DATA_GNU * 100) + 1);
 545 +       if (memcmp(payload, "GET /uri-res/", 13) == 0) return ((IPP2P_DATA_GNU * 100) + 2);
 546 +    }
 547 +    return 0;
 548 +}
 549 +
 550 +
 551 +/*check for gnutella get commands and other typical data*/
 552 +int
 553 +search_all_gnu (const unsigned char *payload, const u16 plen)
 554 +{
 555 +
 556 +    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a))
 557 +    {
 558 +
 559 +       if (memcmp(payload, "GNUTELLA CONNECT/", 17) == 0) return ((IPP2P_GNU * 100) + 1);
 560 +       if (memcmp(payload, "GNUTELLA/", 9) == 0) return ((IPP2P_GNU * 100) + 2);
 561 +
 562 +
 563 +       if ((memcmp(payload, "GET /get/", 9) == 0) || (memcmp(payload, "GET /uri-res/", 13) == 0))
 564 +       {
 565 +               u16 c=8;
 566 +               const u16 end=plen-22;
 567 +               while (c < end) {
 568 +                       if ( payload[c] == 0x0a && payload[c+1] == 0x0d && ((memcmp(&payload[c+2], "X-Gnutella-", 11) == 0) || (memcmp(&payload[c+2], "X-Queue:", 8) == 0)))
 569 +                               return ((IPP2P_GNU * 100) + 3);
 570 +                       c++;
 571 +               }
 572 +       }
 573 +    }
 574 +    return 0;
 575 +}
 576 +
 577 +
 578 +/*check for KaZaA download commands and other typical data*/
 579 +int
 580 +search_all_kazaa (const unsigned char *payload, const u16 plen)
 581 +{
 582 +    if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a))
 583 +    {
 584 +
 585 +       if (memcmp(payload, "GIVE ", 5) == 0) return ((IPP2P_KAZAA * 100) + 1);
 586 +
 587 +       if (memcmp(payload, "GET /", 5) == 0) {
 588 +               u16 c = 8;
 589 +               const u16 end=plen-22;
 590 +               while (c < end) {
 591 +                       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)))
 592 +                               return ((IPP2P_KAZAA * 100) + 2);
 593 +                       c++;
 594 +               }
 595 +       }
 596 +    }
 597 +    return 0;
 598 +}
 599 +
 600 +/*fast check for edonkey file segment transfer command*/
 601 +int
 602 +search_edk (const unsigned char *payload, const u16 plen)
 603 +{
 604 +    if (payload[0] != 0xe3)
 605 +       return 0;
 606 +    else {
 607 +       if (payload[5] == 0x47)
 608 +           return (IPP2P_DATA_EDK * 100);
 609 +       else
 610 +           return 0;
 611 +    }
 612 +}
 613 +
 614 +
 615 +
 616 +/*intensive but slower search for some edonkey packets including size-check*/
 617 +int
 618 +search_all_edk (const unsigned char *payload, const u16 plen)
 619 +{
 620 +    if (payload[0] != 0xe3)
 621 +       return 0;
 622 +    else {
 623 +       //t += head_len;
 624 +       const u16 cmd = get_u16(payload, 1);
 625 +       if (cmd == (plen - 5)) {
 626 +           switch (payload[5]) {
 627 +               case 0x01: return ((IPP2P_EDK * 100) + 1);      /*Client: hello or Server:hello*/
 628 +               case 0x4c: return ((IPP2P_EDK * 100) + 9);      /*Client: Hello-Answer*/
 629 +           }
 630 +       }
 631 +       return 0;
 632 +     }
 633 +}
 634 +
 635 +
 636 +/*fast check for Direct Connect send command*/
 637 +int
 638 +search_dc (const unsigned char *payload, const u16 plen)
 639 +{
 640 +
 641 +    if (payload[0] != 0x24 )
 642 +       return 0;
 643 +    else {
 644 +       if (memcmp(&payload[1], "Send|", 5) == 0)
 645 +           return (IPP2P_DATA_DC * 100);
 646 +       else
 647 +           return 0;
 648 +    }
 649 +
 650 +}
 651 +
 652 +
 653 +/*intensive but slower check for all direct connect packets*/
 654 +int
 655 +search_all_dc (const unsigned char *payload, const u16 plen)
 656 +{
 657 +//    unsigned char *t = haystack;
 658 +
 659 +    if (payload[0] == 0x24 && payload[plen-1] == 0x7c)
 660 +    {
 661 +       const unsigned char *t=&payload[1];
 662 +               /* Client-Hub-Protocol */
 663 +       if (memcmp(t, "Lock ", 5) == 0)                 return ((IPP2P_DC * 100) + 1);
 664 +       /* Client-Client-Protocol, some are already recognized by client-hub (like lock) */
 665 +       if (memcmp(t, "MyNick ", 7) == 0)               return ((IPP2P_DC * 100) + 38);
 666 +    }
 667 +    return 0;
 668 +}
 669 +
 670 +/*check for mute*/
 671 +int
 672 +search_mute (const unsigned char *payload, const u16 plen)
 673 +{
 674 +       if ( plen == 209 || plen == 345 || plen == 473 || plen == 609 || plen == 1121 )
 675 +       {
 676 +               //printk(KERN_DEBUG "size hit: %u",size);
 677 +               if (memcmp(payload,"PublicKey: ",11) == 0 )
 678 +               {
 679 +                       return ((IPP2P_MUTE * 100) + 0);
 680 +
 681 +/*                     if (memcmp(t+size-14,"\x0aEndPublicKey\x0a",14) == 0)
 682 +                       {
 683 +                               printk(KERN_DEBUG "end pubic key hit: %u",size);
 684 +
 685 +                       }*/
 686 +               }
 687 +       }
 688 +       return 0;
 689 +}
 690 +
 691 +
 692 +/* check for xdcc */
 693 +int
 694 +search_xdcc (const unsigned char *payload, const u16 plen)
 695 +{
 696 +       /* search in small packets only */
 697 +       if (plen > 20 && plen < 200 && payload[plen-1] == 0x0a && payload[plen-2] == 0x0d && memcmp(payload,"PRIVMSG ",8) == 0)
 698 +       {
 699 +
 700 +               u16 x=10;
 701 +               const u16 end=plen - 13;
 702 +
 703 +               /* is seems to be a irc private massage, chedck for xdcc command */
 704 +               while (x < end)
 705 +               {
 706 +                       if (payload[x] == ':')
 707 +                       {
 708 +                               if ( memcmp(&payload[x+1],"xdcc send #",11) == 0 )
 709 +                                       return ((IPP2P_XDCC * 100) + 0);
 710 +                       }
 711 +                       x++;
 712 +               }
 713 +       }
 714 +       return 0;
 715 +}
 716 +
 717 +/* search for waste */
 718 +int search_waste(const unsigned char *payload, const u16 plen)
 719 +{
 720 +       if ( plen >= 8 && memcmp(payload,"GET.sha1:",9) == 0)
 721 +               return ((IPP2P_WASTE * 100) + 0);
 722 +
 723 +       return 0;
 724 +}
 725 +
 726 +
 727 +static struct {
 728 +    int command;
 729 +    __u8 short_hand;                   /*for fucntions included in short hands*/
 730 +    int packet_len;
 731 +    int (*function_name) (const unsigned char *, const u16);
 732 +} matchlist[] = {
 733 +    {IPP2P_EDK,SHORT_HAND_IPP2P,20, &search_all_edk},
 734 +//    {IPP2P_DATA_KAZAA,SHORT_HAND_DATA,200, &search_kazaa},
 735 +//    {IPP2P_DATA_EDK,SHORT_HAND_DATA,60, &search_edk},
 736 +//    {IPP2P_DATA_DC,SHORT_HAND_DATA,26, &search_dc},
 737 +    {IPP2P_DC,SHORT_HAND_IPP2P,5, search_all_dc},
 738 +//    {IPP2P_DATA_GNU,SHORT_HAND_DATA,40, &search_gnu},
 739 +    {IPP2P_GNU,SHORT_HAND_IPP2P,5, &search_all_gnu},
 740 +    {IPP2P_KAZAA,SHORT_HAND_IPP2P,5, &search_all_kazaa},
 741 +    {IPP2P_BIT,SHORT_HAND_IPP2P,20, &search_bittorrent},
 742 +    {IPP2P_APPLE,SHORT_HAND_IPP2P,5, &search_apple},
 743 +    {IPP2P_SOUL,SHORT_HAND_IPP2P,5, &search_soul},
 744 +    {IPP2P_WINMX,SHORT_HAND_IPP2P,2, &search_winmx},
 745 +    {IPP2P_ARES,SHORT_HAND_IPP2P,5, &search_ares},
 746 +    {IPP2P_MUTE,SHORT_HAND_NONE,200, &search_mute},
 747 +    {IPP2P_WASTE,SHORT_HAND_NONE,5, &search_waste},
 748 +    {IPP2P_XDCC,SHORT_HAND_NONE,5, &search_xdcc},
 749 +    {0,0,0,NULL}
 750 +};
 751 +
 752 +
 753 +static struct {
 754 +    int command;
 755 +    __u8 short_hand;                   /*for fucntions included in short hands*/
 756 +    int packet_len;
 757 +    int (*function_name) (unsigned char *, int);
 758 +} udp_list[] = {
 759 +    {IPP2P_KAZAA,SHORT_HAND_IPP2P,14, &udp_search_kazaa},
 760 +    {IPP2P_BIT,SHORT_HAND_IPP2P,23, &udp_search_bit},
 761 +    {IPP2P_GNU,SHORT_HAND_IPP2P,11, &udp_search_gnu},
 762 +    {IPP2P_EDK,SHORT_HAND_IPP2P,9, &udp_search_edk},
 763 +    {IPP2P_DC,SHORT_HAND_IPP2P,12, &udp_search_directconnect},
 764 +    {0,0,0,NULL}
 765 +};
 766 +
 767 +
 768 +static int
 769 +match(const struct sk_buff *skb,
 770 +      const struct net_device *in,
 771 +      const struct net_device *out,
 772 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
 773 +      const struct xt_match *match,
 774 +#endif
 775 +      const void *matchinfo,
 776 +      int offset,
 777 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
 778 +      unsigned int protoff,
 779 +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
 780 +      const void *hdr,
 781 +      u_int16_t datalen,
 782 +#endif
 783 +      int *hotdrop)
 784 +{
 785 +    const struct ipt_p2p_info *info = matchinfo;
 786 +    unsigned char  *haystack;
 787 +    struct iphdr *ip = ip_hdr(skb);
 788 +    int p2p_result = 0, i = 0;
 789 +//    int head_len;
 790 +    int hlen = ntohs(ip->tot_len)-(ip->ihl*4); /*hlen = packet-data length*/
 791 +
 792 +    /*must not be a fragment*/
 793 +    if (offset) {
 794 +       if (info->debug) printk("IPP2P.match: offset found %i \n",offset);
 795 +       return 0;
 796 +    }
 797 +
 798 +    /*make sure that skb is linear*/
 799 +    if(skb_is_nonlinear(skb)){
 800 +       if (info->debug) printk("IPP2P.match: nonlinear skb found\n");
 801 +       return 0;
 802 +    }
 803 +
 804 +
 805 +    haystack=(char *)ip+(ip->ihl*4);           /*haystack = packet data*/
 806 +
 807 +    switch (ip->protocol){
 808 +       case IPPROTO_TCP:               /*what to do with a TCP packet*/
 809 +       {
 810 +           struct tcphdr *tcph = (void *) ip + ip->ihl * 4;
 811 +
 812 +           if (tcph->fin) return 0;  /*if FIN bit is set bail out*/
 813 +           if (tcph->syn) return 0;  /*if SYN bit is set bail out*/
 814 +           if (tcph->rst) return 0;  /*if RST bit is set bail out*/
 815 +
 816 +           haystack += tcph->doff * 4; /*get TCP-Header-Size*/
 817 +           hlen -= tcph->doff * 4;
 818 +           while (matchlist[i].command) {
 819 +               if ((((info->cmd & matchlist[i].command) == matchlist[i].command) ||
 820 +                   ((info->cmd & matchlist[i].short_hand) == matchlist[i].short_hand)) &&
 821 +                   (hlen > matchlist[i].packet_len)) {
 822 +                           p2p_result = matchlist[i].function_name(haystack, hlen);
 823 +                           if (p2p_result)
 824 +                           {
 825 +                               if (info->debug) printk("IPP2P.debug:TCP-match: %i from: %u.%u.%u.%u:%i to: %u.%u.%u.%u:%i Length: %i\n",
 826 +                                   p2p_result, NIPQUAD(ip->saddr),ntohs(tcph->source), NIPQUAD(ip->daddr),ntohs(tcph->dest),hlen);
 827 +                               return p2p_result;
 828 +                           }
 829 +               }
 830 +           i++;
 831 +           }
 832 +           return p2p_result;
 833 +       }
 834 +
 835 +       case IPPROTO_UDP:               /*what to do with an UDP packet*/
 836 +       {
 837 +           struct udphdr *udph = (void *) ip + ip->ihl * 4;
 838 +
 839 +           while (udp_list[i].command){
 840 +               if ((((info->cmd & udp_list[i].command) == udp_list[i].command) ||
 841 +                   ((info->cmd & udp_list[i].short_hand) == udp_list[i].short_hand)) &&
 842 +                   (hlen > udp_list[i].packet_len)) {
 843 +                           p2p_result = udp_list[i].function_name(haystack, hlen);
 844 +                           if (p2p_result){
 845 +                               if (info->debug) printk("IPP2P.debug:UDP-match: %i from: %u.%u.%u.%u:%i to: %u.%u.%u.%u:%i Length: %i\n",
 846 +                                   p2p_result, NIPQUAD(ip->saddr),ntohs(udph->source), NIPQUAD(ip->daddr),ntohs(udph->dest),hlen);
 847 +                               return p2p_result;
 848 +                           }
 849 +               }
 850 +           i++;
 851 +           }
 852 +           return p2p_result;
 853 +       }
 854 +
 855 +       default: return 0;
 856 +    }
 857 +}
 858 +
 859 +
 860 +
 861 +static int
 862 +checkentry(const char *tablename,
 863 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
 864 +           const void *ip,
 865 +           const struct xt_match *match,
 866 +#else
 867 +            const struct ipt_ip *ip,
 868 +#endif
 869 +           void *matchinfo,
 870 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
 871 +           unsigned int matchsize,
 872 +#endif
 873 +           unsigned int hook_mask)
 874 +{
 875 +        /* Must specify -p tcp */
 876 +/*    if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) {
 877 + *     printk("ipp2p: Only works on TCP packets, use -p tcp\n");
 878 + *     return 0;
 879 + *    }*/
 880 +    return 1;
 881 +}
 882 +
 883 +
 884 +
 885 +
 886 +static struct ipt_match ipp2p_match = {
 887 +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
 888 +       { NULL, NULL },
 889 +       "ipp2p",
 890 +       &match,
 891 +       &checkentry,
 892 +       NULL,
 893 +       THIS_MODULE
 894 +#endif
 895 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
 896 +       .name           = "ipp2p",
 897 +       .match          = &match,
 898 +       .family         = AF_INET,
 899 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,18)
 900 +       .matchsize      = sizeof(struct ipt_p2p_info),
 901 +#endif
 902 +       .checkentry     = &checkentry,
 903 +       .me             = THIS_MODULE,
 904 +#endif
 905 +};
 906 +
 907 +
 908 +static int __init init(void)
 909 +{
 910 +    printk(KERN_INFO "IPP2P v%s loading\n", IPP2P_VERSION);
 911 +    return xt_register_match(&ipp2p_match);
 912 +}
 913 +
 914 +static void __exit fini(void)
 915 +{
 916 +    xt_unregister_match(&ipp2p_match);
 917 +    printk(KERN_INFO "IPP2P v%s unloaded\n", IPP2P_VERSION);
 918 +}
 919 +
 920 +module_init(init);
 921 +module_exit(fini);
 922 +
 923 +
 924 Index: linux-2.6.21.7/net/ipv4/netfilter/Kconfig
 925 ===================================================================
 926 --- linux-2.6.21.7.orig/net/ipv4/netfilter/Kconfig
 927 +++ linux-2.6.21.7/net/ipv4/netfilter/Kconfig
 928 @@ -245,6 +245,12 @@ config IP_NF_MATCH_IPRANGE
 929
 930           To compile it as a module, choose M here.  If unsure, say N.
 931
 932 +config IP_NF_MATCH_IPP2P
 933 +       tristate "IPP2P"
 934 +       depends on IP_NF_IPTABLES
 935 +       help
 936 +         Module for matching traffic of various Peer-to-Peer applications
 937 +
 938  config IP_NF_MATCH_TOS
 939         tristate "TOS match support"
 940         depends on IP_NF_IPTABLES
 941 Index: linux-2.6.21.7/net/ipv4/netfilter/Makefile
 942 ===================================================================
 943 --- linux-2.6.21.7.orig/net/ipv4/netfilter/Makefile
 944 +++ linux-2.6.21.7/net/ipv4/netfilter/Makefile
 945 @@ -91,6 +91,7 @@ obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn
 946  obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
 947  obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
 948  obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
 949 +obj-$(CONFIG_IP_NF_MATCH_IPP2P) += ipt_ipp2p.o
 950
 951  # targets
 952  obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o