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552b817b MT |
1 | #if defined(MODVERSIONS) |
2 | #include <linux/modversions.h> | |
3 | #endif | |
4 | #include <linux/module.h> | |
552b817b | 5 | #include <linux/version.h> |
2d4a4c40 MT |
6 | |
7 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) | |
8 | # include <linux/netfilter/x_tables.h> | |
9 | # define ipt_register_match xt_register_match | |
10 | # define ipt_unregister_match xt_unregister_match | |
11 | # define ipt_match xt_match | |
12 | #else | |
13 | # include <linux/netfilter_ipv4/ip_tables.h> | |
552b817b | 14 | //#include <linux/netfilter_ipv4/ipt_ipp2p.h> |
2d4a4c40 MT |
15 | #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21) */ |
16 | ||
552b817b MT |
17 | #include "ipt_ipp2p.h" |
18 | #include <net/tcp.h> | |
19 | #include <net/udp.h> | |
20 | ||
21 | #define get_u8(X,O) (*(__u8 *)(X + O)) | |
22 | #define get_u16(X,O) (*(__u16 *)(X + O)) | |
23 | #define get_u32(X,O) (*(__u32 *)(X + O)) | |
24 | ||
25 | MODULE_AUTHOR("Eicke Friedrich/Klaus Degner <ipp2p@ipp2p.org>"); | |
26 | MODULE_DESCRIPTION("An extension to iptables to identify P2P traffic."); | |
27 | MODULE_LICENSE("GPL"); | |
28 | ||
29 | ||
30 | /*Search for UDP eDonkey/eMule/Kad commands*/ | |
31 | int | |
32 | udp_search_edk (unsigned char *haystack, int packet_len) | |
33 | { | |
34 | unsigned char *t = haystack; | |
35 | t += 8; | |
36 | ||
37 | switch (t[0]) { | |
38 | case 0xe3: | |
39 | { /*edonkey*/ | |
40 | switch (t[1]) | |
41 | { | |
42 | /* client -> server status request */ | |
43 | case 0x96: | |
44 | if (packet_len == 14) return ((IPP2P_EDK * 100) + 50); | |
45 | break; | |
46 | /* server -> client status request */ | |
47 | case 0x97: if (packet_len == 42) return ((IPP2P_EDK * 100) + 51); | |
48 | break; | |
49 | /* server description request */ | |
50 | /* e3 2a ff f0 .. | size == 6 */ | |
51 | case 0xa2: if ( (packet_len == 14) && ( get_u16(t,2) == __constant_htons(0xfff0) ) ) return ((IPP2P_EDK * 100) + 52); | |
52 | break; | |
53 | /* server description response */ | |
54 | /* e3 a3 ff f0 .. | size > 40 && size < 200 */ | |
55 | //case 0xa3: return ((IPP2P_EDK * 100) + 53); | |
56 | // break; | |
57 | case 0x9a: if (packet_len==26) return ((IPP2P_EDK * 100) + 54); | |
58 | break; | |
59 | ||
60 | case 0x92: if (packet_len==18) return ((IPP2P_EDK * 100) + 55); | |
61 | break; | |
62 | } | |
63 | break; | |
64 | } | |
65 | case 0xe4: | |
66 | { | |
67 | switch (t[1]) | |
68 | { | |
69 | /* e4 20 .. | size == 43 */ | |
70 | case 0x20: if ((packet_len == 43) && (t[2] != 0x00) && (t[34] != 0x00)) return ((IPP2P_EDK * 100) + 60); | |
71 | break; | |
72 | /* e4 00 .. 00 | size == 35 ? */ | |
73 | case 0x00: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 61); | |
74 | break; | |
75 | /* e4 10 .. 00 | size == 35 ? */ | |
76 | case 0x10: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 62); | |
77 | break; | |
78 | /* e4 18 .. 00 | size == 35 ? */ | |
79 | case 0x18: if ((packet_len == 35) && (t[26] == 0x00)) return ((IPP2P_EDK * 100) + 63); | |
80 | break; | |
81 | /* e4 52 .. | size = 44 */ | |
82 | case 0x52: if (packet_len == 44 ) return ((IPP2P_EDK * 100) + 64); | |
83 | break; | |
84 | /* e4 58 .. | size == 6 */ | |
85 | case 0x58: if (packet_len == 14 ) return ((IPP2P_EDK * 100) + 65); | |
86 | break; | |
87 | /* e4 59 .. | size == 2 */ | |
88 | case 0x59: if (packet_len == 10 )return ((IPP2P_EDK * 100) + 66); | |
89 | break; | |
90 | /* e4 28 .. | packet_len == 52,77,102,127... */ | |
91 | case 0x28: if (((packet_len-52) % 25) == 0) return ((IPP2P_EDK * 100) + 67); | |
92 | break; | |
93 | /* e4 50 xx xx | size == 4 */ | |
94 | case 0x50: if (packet_len == 12) return ((IPP2P_EDK * 100) + 68); | |
95 | break; | |
96 | /* e4 40 xx xx | size == 48 */ | |
97 | case 0x40: if (packet_len == 56) return ((IPP2P_EDK * 100) + 69); | |
98 | break; | |
99 | } | |
100 | break; | |
101 | } | |
102 | } /* end of switch (t[0]) */ | |
103 | return 0; | |
104 | }/*udp_search_edk*/ | |
105 | ||
106 | ||
107 | /*Search for UDP Gnutella commands*/ | |
108 | int | |
109 | udp_search_gnu (unsigned char *haystack, int packet_len) | |
110 | { | |
111 | unsigned char *t = haystack; | |
112 | t += 8; | |
113 | ||
114 | if (memcmp(t, "GND", 3) == 0) return ((IPP2P_GNU * 100) + 51); | |
115 | if (memcmp(t, "GNUTELLA ", 9) == 0) return ((IPP2P_GNU * 100) + 52); | |
116 | return 0; | |
117 | }/*udp_search_gnu*/ | |
118 | ||
119 | ||
120 | /*Search for UDP KaZaA commands*/ | |
121 | int | |
122 | udp_search_kazaa (unsigned char *haystack, int packet_len) | |
123 | { | |
124 | unsigned char *t = haystack; | |
125 | ||
126 | if (t[packet_len-1] == 0x00){ | |
127 | t += (packet_len - 6); | |
128 | if (memcmp(t, "KaZaA", 5) == 0) return (IPP2P_KAZAA * 100 +50); | |
129 | } | |
130 | ||
131 | return 0; | |
132 | }/*udp_search_kazaa*/ | |
133 | ||
134 | /*Search for UDP DirectConnect commands*/ | |
135 | int | |
136 | udp_search_directconnect (unsigned char *haystack, int packet_len) | |
137 | { | |
138 | unsigned char *t = haystack; | |
139 | if ((*(t + 8) == 0x24) && (*(t + packet_len - 1) == 0x7c)) { | |
140 | t+=8; | |
141 | if (memcmp(t, "SR ", 3) == 0) return ((IPP2P_DC * 100) + 60); | |
142 | if (memcmp(t, "Ping ", 5) == 0) return ((IPP2P_DC * 100) + 61); | |
143 | } | |
144 | return 0; | |
145 | }/*udp_search_directconnect*/ | |
146 | ||
147 | ||
148 | ||
149 | /*Search for UDP BitTorrent commands*/ | |
150 | int | |
151 | udp_search_bit (unsigned char *haystack, int packet_len) | |
152 | { | |
153 | switch(packet_len) | |
154 | { | |
155 | case 24: | |
156 | /* ^ 00 00 04 17 27 10 19 80 */ | |
157 | if ((ntohl(get_u32(haystack, 8)) == 0x00000417) && (ntohl(get_u32(haystack, 12)) == 0x27101980)) | |
158 | return (IPP2P_BIT * 100 + 50); | |
159 | break; | |
160 | case 44: | |
161 | if (get_u32(haystack, 16) == __constant_htonl(0x00000400) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) | |
162 | return (IPP2P_BIT * 100 + 51); | |
163 | if (get_u32(haystack, 16) == __constant_htonl(0x00000400)) | |
164 | return (IPP2P_BIT * 100 + 61); | |
165 | break; | |
166 | case 65: | |
167 | if (get_u32(haystack, 16) == __constant_htonl(0x00000404) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) | |
168 | return (IPP2P_BIT * 100 + 52); | |
169 | if (get_u32(haystack, 16) == __constant_htonl(0x00000404)) | |
170 | return (IPP2P_BIT * 100 + 62); | |
171 | break; | |
172 | case 67: | |
173 | if (get_u32(haystack, 16) == __constant_htonl(0x00000406) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) | |
174 | return (IPP2P_BIT * 100 + 53); | |
175 | if (get_u32(haystack, 16) == __constant_htonl(0x00000406)) | |
176 | return (IPP2P_BIT * 100 + 63); | |
177 | break; | |
178 | case 211: | |
179 | if (get_u32(haystack, 8) == __constant_htonl(0x00000405)) | |
180 | return (IPP2P_BIT * 100 + 54); | |
181 | break; | |
182 | case 29: | |
183 | if ((get_u32(haystack, 8) == __constant_htonl(0x00000401))) | |
184 | return (IPP2P_BIT * 100 + 55); | |
185 | break; | |
186 | case 52: | |
187 | if (get_u32(haystack,8) == __constant_htonl(0x00000827) && | |
188 | get_u32(haystack,12) == __constant_htonl(0x37502950)) | |
189 | return (IPP2P_BIT * 100 + 80); | |
190 | break; | |
191 | default: | |
192 | /* this packet does not have a constant size */ | |
193 | if (packet_len >= 40 && get_u32(haystack, 16) == __constant_htonl(0x00000402) && get_u32(haystack, 36) == __constant_htonl(0x00000104)) | |
194 | return (IPP2P_BIT * 100 + 56); | |
195 | break; | |
196 | } | |
197 | ||
198 | /* some extra-bitcomet rules: | |
199 | * "d1:" [a|r] "d2:id20:" | |
200 | */ | |
201 | if (packet_len > 30 && get_u8(haystack, 8) == 'd' && get_u8(haystack, 9) == '1' && get_u8(haystack, 10) == ':' ) | |
202 | { | |
203 | if (get_u8(haystack, 11) == 'a' || get_u8(haystack, 11) == 'r') | |
204 | { | |
205 | if (memcmp(haystack+12,"d2:id20:",8)==0) | |
206 | return (IPP2P_BIT * 100 + 57); | |
207 | } | |
208 | } | |
209 | ||
210 | #if 0 | |
211 | /* bitlord rules */ | |
212 | /* packetlen must be bigger than 40 */ | |
213 | /* first 4 bytes are zero */ | |
214 | if (packet_len > 40 && get_u32(haystack, 8) == 0x00000000) | |
215 | { | |
216 | /* first rule: 00 00 00 00 01 00 00 xx xx xx xx 00 00 00 00*/ | |
217 | if (get_u32(haystack, 12) == 0x00000000 && | |
218 | get_u32(haystack, 16) == 0x00010000 && | |
219 | get_u32(haystack, 24) == 0x00000000 ) | |
220 | return (IPP2P_BIT * 100 + 71); | |
221 | ||
222 | /* 00 01 00 00 0d 00 00 xx xx xx xx 00 00 00 00*/ | |
223 | if (get_u32(haystack, 12) == 0x00000001 && | |
224 | get_u32(haystack, 16) == 0x000d0000 && | |
225 | get_u32(haystack, 24) == 0x00000000 ) | |
226 | return (IPP2P_BIT * 100 + 71); | |
227 | ||
228 | ||
229 | } | |
230 | #endif | |
231 | ||
232 | return 0; | |
233 | }/*udp_search_bit*/ | |
234 | ||
235 | ||
236 | ||
237 | /*Search for Ares commands*/ | |
238 | //#define IPP2P_DEBUG_ARES | |
239 | int | |
240 | search_ares (const unsigned char *payload, const u16 plen) | |
241 | //int search_ares (unsigned char *haystack, int packet_len, int head_len) | |
242 | { | |
243 | // const unsigned char *t = haystack + head_len; | |
244 | ||
245 | /* all ares packets start with */ | |
246 | if (payload[1] == 0 && (plen - payload[0]) == 3) | |
247 | { | |
248 | switch (payload[2]) | |
249 | { | |
250 | case 0x5a: | |
251 | /* ares connect */ | |
252 | if ( plen == 6 && payload[5] == 0x05 ) return ((IPP2P_ARES * 100) + 1); | |
253 | break; | |
254 | case 0x09: | |
255 | /* ares search, min 3 chars --> 14 bytes | |
256 | * lets define a search can be up to 30 chars --> max 34 bytes | |
257 | */ | |
258 | if ( plen >= 14 && plen <= 34 ) return ((IPP2P_ARES * 100) + 1); | |
259 | break; | |
260 | #ifdef IPP2P_DEBUG_ARES | |
261 | default: | |
262 | printk(KERN_DEBUG "Unknown Ares command %x recognized, len: %u \n", (unsigned int) payload[2],plen); | |
263 | #endif /* IPP2P_DEBUG_ARES */ | |
264 | } | |
265 | } | |
266 | ||
267 | #if 0 | |
268 | /* found connect packet: 03 00 5a 04 03 05 */ | |
269 | /* new version ares 1.8: 03 00 5a xx xx 05 */ | |
270 | if ((plen) == 6){ /* possible connect command*/ | |
271 | if ((payload[0] == 0x03) && (payload[1] == 0x00) && (payload[2] == 0x5a) && (payload[5] == 0x05)) | |
272 | return ((IPP2P_ARES * 100) + 1); | |
273 | } | |
274 | if ((plen) == 60){ /* possible download command*/ | |
275 | if ((payload[59] == 0x0a) && (payload[58] == 0x0a)){ | |
276 | if (memcmp(t, "PUSH SHA1:", 10) == 0) /* found download command */ | |
277 | return ((IPP2P_ARES * 100) + 2); | |
278 | } | |
279 | } | |
280 | #endif | |
281 | ||
282 | return 0; | |
283 | } /*search_ares*/ | |
284 | ||
285 | /*Search for SoulSeek commands*/ | |
286 | int | |
287 | search_soul (const unsigned char *payload, const u16 plen) | |
288 | { | |
289 | //#define IPP2P_DEBUG_SOUL | |
290 | /* match: xx xx xx xx | xx = sizeof(payload) - 4 */ | |
291 | if (get_u32(payload, 0) == (plen - 4)){ | |
292 | const __u32 m=get_u32(payload, 4); | |
293 | /* match 00 yy yy 00, yy can be everything */ | |
294 | if ( get_u8(payload, 4) == 0x00 && get_u8(payload, 7) == 0x00 ) | |
295 | { | |
296 | #ifdef IPP2P_DEBUG_SOUL | |
297 | printk(KERN_DEBUG "0: Soulseek command 0x%x recognized\n",get_u32(payload, 4)); | |
298 | #endif /* IPP2P_DEBUG_SOUL */ | |
299 | return ((IPP2P_SOUL * 100) + 1); | |
300 | } | |
301 | ||
302 | /* next match: 01 yy 00 00 | yy can be everything */ | |
303 | if ( get_u8(payload, 4) == 0x01 && get_u16(payload, 6) == 0x0000 ) | |
304 | { | |
305 | #ifdef IPP2P_DEBUG_SOUL | |
306 | printk(KERN_DEBUG "1: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
307 | #endif /* IPP2P_DEBUG_SOUL */ | |
308 | return ((IPP2P_SOUL * 100) + 2); | |
309 | } | |
310 | ||
311 | /* 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 */ | |
312 | /* try to do this in an intelligent way */ | |
313 | /* get all small commandos */ | |
314 | switch(m) | |
315 | { | |
316 | case 7: | |
317 | case 9: | |
318 | case 22: | |
319 | case 23: | |
320 | case 26: | |
321 | case 28: | |
322 | case 50: | |
323 | case 51: | |
324 | case 60: | |
325 | case 91: | |
326 | case 92: | |
327 | case 1001: | |
328 | #ifdef IPP2P_DEBUG_SOUL | |
329 | printk(KERN_DEBUG "2: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
330 | #endif /* IPP2P_DEBUG_SOUL */ | |
331 | return ((IPP2P_SOUL * 100) + 3); | |
332 | } | |
333 | ||
334 | if (m > 0 && m < 6 ) | |
335 | { | |
336 | #ifdef IPP2P_DEBUG_SOUL | |
337 | printk(KERN_DEBUG "3: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
338 | #endif /* IPP2P_DEBUG_SOUL */ | |
339 | return ((IPP2P_SOUL * 100) + 4); | |
340 | } | |
341 | if (m > 12 && m < 19 ) | |
342 | { | |
343 | #ifdef IPP2P_DEBUG_SOUL | |
344 | printk(KERN_DEBUG "4: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
345 | #endif /* IPP2P_DEBUG_SOUL */ | |
346 | return ((IPP2P_SOUL * 100) + 5); | |
347 | } | |
348 | ||
349 | if (m > 34 && m < 38 ) | |
350 | { | |
351 | #ifdef IPP2P_DEBUG_SOUL | |
352 | printk(KERN_DEBUG "5: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
353 | #endif /* IPP2P_DEBUG_SOUL */ | |
354 | return ((IPP2P_SOUL * 100) + 6); | |
355 | } | |
356 | ||
357 | if (m > 39 && m < 47 ) | |
358 | { | |
359 | #ifdef IPP2P_DEBUG_SOUL | |
360 | printk(KERN_DEBUG "6: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
361 | #endif /* IPP2P_DEBUG_SOUL */ | |
362 | return ((IPP2P_SOUL * 100) + 7); | |
363 | } | |
364 | ||
365 | if (m > 61 && m < 70 ) | |
366 | { | |
367 | #ifdef IPP2P_DEBUG_SOUL | |
368 | printk(KERN_DEBUG "7: Soulseek command 0x%x recognized\n",get_u16(payload, 4)); | |
369 | #endif /* IPP2P_DEBUG_SOUL */ | |
370 | return ((IPP2P_SOUL * 100) + 8); | |
371 | } | |
372 | ||
373 | #ifdef IPP2P_DEBUG_SOUL | |
374 | 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); | |
375 | #endif /* IPP2P_DEBUG_SOUL */ | |
376 | } | |
377 | ||
378 | /* match 14 00 00 00 01 yy 00 00 00 STRING(YY) 01 00 00 00 00 46|50 00 00 00 00 */ | |
379 | /* without size at the beginning !!! */ | |
380 | if ( get_u32(payload, 0) == 0x14 && get_u8(payload, 4) == 0x01 ) | |
381 | { | |
382 | __u32 y=get_u32(payload, 5); | |
383 | /* we need 19 chars + string */ | |
384 | if ( (y + 19) <= (plen) ) | |
385 | { | |
386 | const unsigned char *w=payload+9+y; | |
387 | if (get_u32(w, 0) == 0x01 && ( get_u16(w, 4) == 0x4600 || get_u16(w, 4) == 0x5000) && get_u32(w, 6) == 0x00); | |
388 | #ifdef IPP2P_DEBUG_SOUL | |
389 | printk(KERN_DEBUG "Soulssek special client command recognized\n"); | |
390 | #endif /* IPP2P_DEBUG_SOUL */ | |
391 | return ((IPP2P_SOUL * 100) + 9); | |
392 | } | |
393 | } | |
394 | return 0; | |
395 | } | |
396 | ||
397 | ||
398 | /*Search for WinMX commands*/ | |
399 | int | |
400 | search_winmx (const unsigned char *payload, const u16 plen) | |
401 | { | |
402 | //#define IPP2P_DEBUG_WINMX | |
403 | if (((plen) == 4) && (memcmp(payload, "SEND", 4) == 0)) return ((IPP2P_WINMX * 100) + 1); | |
404 | if (((plen) == 3) && (memcmp(payload, "GET", 3) == 0)) return ((IPP2P_WINMX * 100) + 2); | |
405 | //if (packet_len < (head_len + 10)) return 0; | |
406 | if (plen < 10) return 0; | |
407 | ||
408 | if ((memcmp(payload, "SEND", 4) == 0) || (memcmp(payload, "GET", 3) == 0)){ | |
409 | u16 c=4; | |
410 | const u16 end=plen-2; | |
411 | u8 count=0; | |
412 | while (c < end) | |
413 | { | |
414 | if (payload[c]== 0x20 && payload[c+1] == 0x22) | |
415 | { | |
416 | c++; | |
417 | count++; | |
418 | if (count>=2) return ((IPP2P_WINMX * 100) + 3); | |
419 | } | |
420 | c++; | |
421 | } | |
422 | } | |
423 | ||
424 | if ( plen == 149 && payload[0] == '8' ) | |
425 | { | |
426 | #ifdef IPP2P_DEBUG_WINMX | |
427 | printk(KERN_INFO "maybe WinMX\n"); | |
428 | #endif | |
429 | if (get_u32(payload,17) == 0 && get_u32(payload,21) == 0 && get_u32(payload,25) == 0 && | |
430 | // get_u32(payload,33) == __constant_htonl(0x71182b1a) && get_u32(payload,37) == __constant_htonl(0x05050000) && | |
431 | // get_u32(payload,133) == __constant_htonl(0x31097edf) && get_u32(payload,145) == __constant_htonl(0xdcb8f792)) | |
432 | get_u16(payload,39) == 0 && get_u16(payload,135) == __constant_htons(0x7edf) && get_u16(payload,147) == __constant_htons(0xf792)) | |
433 | ||
434 | { | |
435 | #ifdef IPP2P_DEBUG_WINMX | |
436 | printk(KERN_INFO "got WinMX\n"); | |
437 | #endif | |
438 | return ((IPP2P_WINMX * 100) + 4); | |
439 | } | |
440 | } | |
441 | return 0; | |
442 | } /*search_winmx*/ | |
443 | ||
444 | ||
445 | /*Search for appleJuice commands*/ | |
446 | int | |
447 | search_apple (const unsigned char *payload, const u16 plen) | |
448 | { | |
449 | if ( (plen > 7) && (payload[6] == 0x0d) && (payload[7] == 0x0a) && (memcmp(payload, "ajprot", 6) == 0)) return (IPP2P_APPLE * 100); | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
454 | ||
455 | /*Search for BitTorrent commands*/ | |
456 | int | |
457 | search_bittorrent (const unsigned char *payload, const u16 plen) | |
458 | { | |
459 | if (plen > 20) | |
460 | { | |
461 | /* test for match 0x13+"BitTorrent protocol" */ | |
462 | if (payload[0] == 0x13) | |
463 | { | |
464 | if (memcmp(payload+1, "BitTorrent protocol", 19) == 0) return (IPP2P_BIT * 100); | |
465 | } | |
466 | ||
467 | /* get tracker commandos, all starts with GET / | |
468 | * then it can follow: scrape| announce | |
469 | * and then ?hash_info= | |
470 | */ | |
471 | if (memcmp(payload,"GET /",5) == 0) | |
472 | { | |
473 | /* message scrape */ | |
474 | if ( memcmp(payload+5,"scrape?info_hash=",17)==0 ) return (IPP2P_BIT * 100 + 1); | |
475 | /* message announce */ | |
476 | if ( memcmp(payload+5,"announce?info_hash=",19)==0 ) return (IPP2P_BIT * 100 + 2); | |
477 | } | |
478 | } | |
479 | else | |
480 | { | |
481 | /* bitcomet encryptes the first packet, so we have to detect another | |
482 | * one later in the flow */ | |
483 | /* first try failed, too many missdetections */ | |
484 | //if ( size == 5 && get_u32(t,0) == __constant_htonl(1) && t[4] < 3) return (IPP2P_BIT * 100 + 3); | |
485 | ||
486 | /* second try: block request packets */ | |
487 | 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); | |
488 | } | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | ||
494 | ||
495 | /*check for Kazaa get command*/ | |
496 | int | |
497 | search_kazaa (const unsigned char *payload, const u16 plen) | |
498 | ||
499 | { | |
500 | if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a) && memcmp(payload, "GET /.hash=", 11) == 0) | |
501 | return (IPP2P_DATA_KAZAA * 100); | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | ||
507 | /*check for gnutella get command*/ | |
508 | int | |
509 | search_gnu (const unsigned char *payload, const u16 plen) | |
510 | { | |
511 | if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a)) | |
512 | { | |
513 | if (memcmp(payload, "GET /get/", 9) == 0) return ((IPP2P_DATA_GNU * 100) + 1); | |
514 | if (memcmp(payload, "GET /uri-res/", 13) == 0) return ((IPP2P_DATA_GNU * 100) + 2); | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | ||
519 | ||
520 | /*check for gnutella get commands and other typical data*/ | |
521 | int | |
522 | search_all_gnu (const unsigned char *payload, const u16 plen) | |
523 | { | |
524 | ||
525 | if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a)) | |
526 | { | |
527 | ||
528 | if (memcmp(payload, "GNUTELLA CONNECT/", 17) == 0) return ((IPP2P_GNU * 100) + 1); | |
529 | if (memcmp(payload, "GNUTELLA/", 9) == 0) return ((IPP2P_GNU * 100) + 2); | |
530 | ||
531 | ||
532 | if ((memcmp(payload, "GET /get/", 9) == 0) || (memcmp(payload, "GET /uri-res/", 13) == 0)) | |
533 | { | |
534 | u16 c=8; | |
535 | const u16 end=plen-22; | |
536 | while (c < end) { | |
537 | if ( payload[c] == 0x0a && payload[c+1] == 0x0d && ((memcmp(&payload[c+2], "X-Gnutella-", 11) == 0) || (memcmp(&payload[c+2], "X-Queue:", 8) == 0))) | |
538 | return ((IPP2P_GNU * 100) + 3); | |
539 | c++; | |
540 | } | |
541 | } | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
546 | ||
547 | /*check for KaZaA download commands and other typical data*/ | |
548 | int | |
549 | search_all_kazaa (const unsigned char *payload, const u16 plen) | |
550 | { | |
551 | if ((payload[plen-2] == 0x0d) && (payload[plen-1] == 0x0a)) | |
552 | { | |
553 | ||
554 | if (memcmp(payload, "GIVE ", 5) == 0) return ((IPP2P_KAZAA * 100) + 1); | |
555 | ||
556 | if (memcmp(payload, "GET /", 5) == 0) { | |
557 | u16 c = 8; | |
558 | const u16 end=plen-22; | |
559 | while (c < end) { | |
560 | 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))) | |
561 | return ((IPP2P_KAZAA * 100) + 2); | |
562 | c++; | |
563 | } | |
564 | } | |
565 | } | |
566 | return 0; | |
567 | } | |
568 | ||
569 | /*fast check for edonkey file segment transfer command*/ | |
570 | int | |
571 | search_edk (const unsigned char *payload, const u16 plen) | |
572 | { | |
573 | if (payload[0] != 0xe3) | |
574 | return 0; | |
575 | else { | |
576 | if (payload[5] == 0x47) | |
577 | return (IPP2P_DATA_EDK * 100); | |
578 | else | |
579 | return 0; | |
580 | } | |
581 | } | |
582 | ||
583 | ||
584 | ||
585 | /*intensive but slower search for some edonkey packets including size-check*/ | |
586 | int | |
587 | search_all_edk (const unsigned char *payload, const u16 plen) | |
588 | { | |
589 | if (payload[0] != 0xe3) | |
590 | return 0; | |
591 | else { | |
592 | //t += head_len; | |
593 | const u16 cmd = get_u16(payload, 1); | |
594 | if (cmd == (plen - 5)) { | |
595 | switch (payload[5]) { | |
596 | case 0x01: return ((IPP2P_EDK * 100) + 1); /*Client: hello or Server:hello*/ | |
597 | case 0x4c: return ((IPP2P_EDK * 100) + 9); /*Client: Hello-Answer*/ | |
598 | } | |
599 | } | |
600 | return 0; | |
601 | } | |
602 | } | |
603 | ||
604 | ||
605 | /*fast check for Direct Connect send command*/ | |
606 | int | |
607 | search_dc (const unsigned char *payload, const u16 plen) | |
608 | { | |
609 | ||
610 | if (payload[0] != 0x24 ) | |
611 | return 0; | |
612 | else { | |
613 | if (memcmp(&payload[1], "Send|", 5) == 0) | |
614 | return (IPP2P_DATA_DC * 100); | |
615 | else | |
616 | return 0; | |
617 | } | |
618 | ||
619 | } | |
620 | ||
621 | ||
622 | /*intensive but slower check for all direct connect packets*/ | |
623 | int | |
624 | search_all_dc (const unsigned char *payload, const u16 plen) | |
625 | { | |
626 | // unsigned char *t = haystack; | |
627 | ||
628 | if (payload[0] == 0x24 && payload[plen-1] == 0x7c) | |
629 | { | |
630 | const unsigned char *t=&payload[1]; | |
631 | /* Client-Hub-Protocol */ | |
632 | if (memcmp(t, "Lock ", 5) == 0) return ((IPP2P_DC * 100) + 1); | |
633 | /* Client-Client-Protocol, some are already recognized by client-hub (like lock) */ | |
634 | if (memcmp(t, "MyNick ", 7) == 0) return ((IPP2P_DC * 100) + 38); | |
635 | } | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /*check for mute*/ | |
640 | int | |
641 | search_mute (const unsigned char *payload, const u16 plen) | |
642 | { | |
643 | if ( plen == 209 || plen == 345 || plen == 473 || plen == 609 || plen == 1121 ) | |
644 | { | |
645 | //printk(KERN_DEBUG "size hit: %u",size); | |
646 | if (memcmp(payload,"PublicKey: ",11) == 0 ) | |
647 | { | |
648 | return ((IPP2P_MUTE * 100) + 0); | |
649 | ||
650 | /* if (memcmp(t+size-14,"\x0aEndPublicKey\x0a",14) == 0) | |
651 | { | |
652 | printk(KERN_DEBUG "end pubic key hit: %u",size); | |
653 | ||
654 | }*/ | |
655 | } | |
656 | } | |
657 | return 0; | |
658 | } | |
659 | ||
660 | ||
661 | /* check for xdcc */ | |
662 | int | |
663 | search_xdcc (const unsigned char *payload, const u16 plen) | |
664 | { | |
665 | /* search in small packets only */ | |
666 | if (plen > 20 && plen < 200 && payload[plen-1] == 0x0a && payload[plen-2] == 0x0d && memcmp(payload,"PRIVMSG ",8) == 0) | |
667 | { | |
668 | ||
669 | u16 x=10; | |
670 | const u16 end=plen - 13; | |
671 | ||
672 | /* is seems to be a irc private massage, chedck for xdcc command */ | |
673 | while (x < end) | |
674 | { | |
675 | if (payload[x] == ':') | |
676 | { | |
677 | if ( memcmp(&payload[x+1],"xdcc send #",11) == 0 ) | |
678 | return ((IPP2P_XDCC * 100) + 0); | |
679 | } | |
680 | x++; | |
681 | } | |
682 | } | |
683 | return 0; | |
684 | } | |
685 | ||
686 | /* search for waste */ | |
687 | int search_waste(const unsigned char *payload, const u16 plen) | |
688 | { | |
689 | if ( plen >= 8 && memcmp(payload,"GET.sha1:",9) == 0) | |
690 | return ((IPP2P_WASTE * 100) + 0); | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | ||
696 | static struct { | |
697 | int command; | |
698 | __u8 short_hand; /*for fucntions included in short hands*/ | |
699 | int packet_len; | |
700 | int (*function_name) (const unsigned char *, const u16); | |
701 | } matchlist[] = { | |
702 | {IPP2P_EDK,SHORT_HAND_IPP2P,20, &search_all_edk}, | |
703 | // {IPP2P_DATA_KAZAA,SHORT_HAND_DATA,200, &search_kazaa}, | |
704 | // {IPP2P_DATA_EDK,SHORT_HAND_DATA,60, &search_edk}, | |
705 | // {IPP2P_DATA_DC,SHORT_HAND_DATA,26, &search_dc}, | |
706 | {IPP2P_DC,SHORT_HAND_IPP2P,5, search_all_dc}, | |
707 | // {IPP2P_DATA_GNU,SHORT_HAND_DATA,40, &search_gnu}, | |
708 | {IPP2P_GNU,SHORT_HAND_IPP2P,5, &search_all_gnu}, | |
709 | {IPP2P_KAZAA,SHORT_HAND_IPP2P,5, &search_all_kazaa}, | |
710 | {IPP2P_BIT,SHORT_HAND_IPP2P,20, &search_bittorrent}, | |
711 | {IPP2P_APPLE,SHORT_HAND_IPP2P,5, &search_apple}, | |
712 | {IPP2P_SOUL,SHORT_HAND_IPP2P,5, &search_soul}, | |
713 | {IPP2P_WINMX,SHORT_HAND_IPP2P,2, &search_winmx}, | |
714 | {IPP2P_ARES,SHORT_HAND_IPP2P,5, &search_ares}, | |
715 | {IPP2P_MUTE,SHORT_HAND_NONE,200, &search_mute}, | |
716 | {IPP2P_WASTE,SHORT_HAND_NONE,5, &search_waste}, | |
717 | {IPP2P_XDCC,SHORT_HAND_NONE,5, &search_xdcc}, | |
718 | {0,0,0,NULL} | |
719 | }; | |
720 | ||
721 | ||
722 | static struct { | |
723 | int command; | |
724 | __u8 short_hand; /*for fucntions included in short hands*/ | |
725 | int packet_len; | |
726 | int (*function_name) (unsigned char *, int); | |
727 | } udp_list[] = { | |
728 | {IPP2P_KAZAA,SHORT_HAND_IPP2P,14, &udp_search_kazaa}, | |
729 | {IPP2P_BIT,SHORT_HAND_IPP2P,23, &udp_search_bit}, | |
730 | {IPP2P_GNU,SHORT_HAND_IPP2P,11, &udp_search_gnu}, | |
731 | {IPP2P_EDK,SHORT_HAND_IPP2P,9, &udp_search_edk}, | |
732 | {IPP2P_DC,SHORT_HAND_IPP2P,12, &udp_search_directconnect}, | |
733 | {0,0,0,NULL} | |
734 | }; | |
735 | ||
736 | ||
2d4a4c40 MT |
737 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) |
738 | static bool | |
739 | #else | |
552b817b | 740 | static int |
2d4a4c40 | 741 | #endif |
552b817b MT |
742 | match(const struct sk_buff *skb, |
743 | const struct net_device *in, | |
744 | const struct net_device *out, | |
745 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) | |
746 | const struct xt_match *mymatch, | |
747 | const void *matchinfo, | |
748 | int offset, | |
749 | unsigned int myprotoff, | |
750 | #else | |
751 | const void *matchinfo, | |
752 | int offset, | |
753 | #endif | |
754 | ||
755 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) | |
756 | const void *hdr, | |
757 | u_int16_t datalen, | |
758 | #endif | |
759 | ||
2d4a4c40 MT |
760 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) |
761 | bool *hotdrop) | |
762 | #else | |
552b817b | 763 | int *hotdrop) |
2d4a4c40 | 764 | #endif |
552b817b MT |
765 | { |
766 | const struct ipt_p2p_info *info = matchinfo; | |
767 | unsigned char *haystack; | |
2d4a4c40 MT |
768 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) |
769 | struct iphdr *ip = ip_hdr(skb); | |
770 | #else | |
552b817b | 771 | struct iphdr *ip = skb->nh.iph; |
2d4a4c40 | 772 | #endif |
552b817b MT |
773 | int p2p_result = 0, i = 0; |
774 | // int head_len; | |
775 | int hlen = ntohs(ip->tot_len)-(ip->ihl*4); /*hlen = packet-data length*/ | |
776 | ||
777 | /*must not be a fragment*/ | |
778 | if (offset) { | |
779 | if (info->debug) printk("IPP2P.match: offset found %i \n",offset); | |
780 | return 0; | |
781 | } | |
782 | ||
783 | /*make sure that skb is linear*/ | |
784 | if(skb_is_nonlinear(skb)){ | |
785 | if (info->debug) printk("IPP2P.match: nonlinear skb found\n"); | |
786 | return 0; | |
787 | } | |
788 | ||
789 | ||
790 | haystack=(char *)ip+(ip->ihl*4); /*haystack = packet data*/ | |
791 | ||
792 | switch (ip->protocol){ | |
793 | case IPPROTO_TCP: /*what to do with a TCP packet*/ | |
794 | { | |
795 | struct tcphdr *tcph = (void *) ip + ip->ihl * 4; | |
796 | ||
797 | if (tcph->fin) return 0; /*if FIN bit is set bail out*/ | |
798 | if (tcph->syn) return 0; /*if SYN bit is set bail out*/ | |
799 | if (tcph->rst) return 0; /*if RST bit is set bail out*/ | |
800 | ||
801 | haystack += tcph->doff * 4; /*get TCP-Header-Size*/ | |
802 | hlen -= tcph->doff * 4; | |
803 | while (matchlist[i].command) { | |
804 | if ((((info->cmd & matchlist[i].command) == matchlist[i].command) || | |
805 | ((info->cmd & matchlist[i].short_hand) == matchlist[i].short_hand)) && | |
806 | (hlen > matchlist[i].packet_len)) { | |
807 | p2p_result = matchlist[i].function_name(haystack, hlen); | |
808 | if (p2p_result) | |
809 | { | |
810 | if (info->debug) printk("IPP2P.debug:TCP-match: %i from: %u.%u.%u.%u:%i to: %u.%u.%u.%u:%i Length: %i\n", | |
811 | p2p_result, NIPQUAD(ip->saddr),ntohs(tcph->source), NIPQUAD(ip->daddr),ntohs(tcph->dest),hlen); | |
812 | return p2p_result; | |
813 | } | |
814 | } | |
815 | i++; | |
816 | } | |
817 | return p2p_result; | |
818 | } | |
819 | ||
820 | case IPPROTO_UDP: /*what to do with an UDP packet*/ | |
821 | { | |
822 | struct udphdr *udph = (void *) ip + ip->ihl * 4; | |
823 | ||
824 | while (udp_list[i].command){ | |
825 | if ((((info->cmd & udp_list[i].command) == udp_list[i].command) || | |
826 | ((info->cmd & udp_list[i].short_hand) == udp_list[i].short_hand)) && | |
827 | (hlen > udp_list[i].packet_len)) { | |
828 | p2p_result = udp_list[i].function_name(haystack, hlen); | |
829 | if (p2p_result){ | |
830 | if (info->debug) printk("IPP2P.debug:UDP-match: %i from: %u.%u.%u.%u:%i to: %u.%u.%u.%u:%i Length: %i\n", | |
831 | p2p_result, NIPQUAD(ip->saddr),ntohs(udph->source), NIPQUAD(ip->daddr),ntohs(udph->dest),hlen); | |
832 | return p2p_result; | |
833 | } | |
834 | } | |
835 | i++; | |
836 | } | |
837 | return p2p_result; | |
838 | } | |
839 | ||
840 | default: return 0; | |
841 | } | |
842 | } | |
843 | ||
844 | ||
845 | ||
2d4a4c40 MT |
846 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22) |
847 | static bool | |
848 | #else | |
552b817b | 849 | static int |
2d4a4c40 | 850 | #endif |
552b817b MT |
851 | checkentry(const char *tablename, |
852 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) | |
853 | const void *ip, | |
854 | const struct xt_match *mymatch, | |
855 | #else | |
856 | const struct ipt_ip *ip, | |
857 | #endif | |
858 | void *matchinfo, | |
2d4a4c40 | 859 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
552b817b | 860 | unsigned int matchsize, |
2d4a4c40 | 861 | #endif |
552b817b MT |
862 | unsigned int hook_mask) |
863 | { | |
864 | /* Must specify -p tcp */ | |
865 | /* if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) { | |
866 | * printk("ipp2p: Only works on TCP packets, use -p tcp\n"); | |
867 | * return 0; | |
868 | * }*/ | |
869 | return 1; | |
870 | } | |
871 | ||
872 | ||
552b817b MT |
873 | static struct ipt_match ipp2p_match = { |
874 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) | |
875 | { NULL, NULL }, | |
876 | "ipp2p", | |
877 | &match, | |
878 | &checkentry, | |
879 | NULL, | |
880 | THIS_MODULE | |
2d4a4c40 | 881 | #elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17) |
552b817b MT |
882 | .name = "ipp2p", |
883 | .match = &match, | |
884 | .checkentry = &checkentry, | |
885 | .me = THIS_MODULE, | |
2d4a4c40 | 886 | #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17) */ |
552b817b MT |
887 | .name = "ipp2p", |
888 | .match = &match, | |
889 | .family = AF_INET, | |
2d4a4c40 | 890 | .matchsize = XT_ALIGN(sizeof(struct ipt_p2p_info)), |
552b817b MT |
891 | .checkentry = &checkentry, |
892 | .me = THIS_MODULE, | |
893 | #endif | |
894 | }; | |
895 | ||
896 | ||
897 | static int __init init(void) | |
898 | { | |
899 | printk(KERN_INFO "IPP2P v%s loading\n", IPP2P_VERSION); | |
900 | return ipt_register_match(&ipp2p_match); | |
901 | } | |
902 | ||
903 | static void __exit fini(void) | |
904 | { | |
905 | ipt_unregister_match(&ipp2p_match); | |
906 | printk(KERN_INFO "IPP2P v%s unloaded\n", IPP2P_VERSION); | |
907 | } | |
908 | ||
909 | module_init(init); | |
910 | module_exit(fini); | |
911 | ||
912 |