Root/target/linux/generic-2.4/patches/601-netfilter_ipp2p_0.8.1rc1.patch

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

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