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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This is a module which is used for logging packets. | |
3 | */ | |
4 | ||
5 | /* (C) 1999-2001 Paul `Rusty' Russell | |
6 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/skbuff.h> | |
16 | #include <linux/ip.h> | |
17 | #include <net/icmp.h> | |
18 | #include <net/udp.h> | |
19 | #include <net/tcp.h> | |
20 | #include <net/route.h> | |
21 | ||
22 | #include <linux/netfilter.h> | |
6709dbbb | 23 | #include <linux/netfilter/x_tables.h> |
1da177e4 | 24 | #include <linux/netfilter_ipv4/ipt_LOG.h> |
f01ffbd6 | 25 | #include <net/netfilter/nf_log.h> |
1da177e4 LT |
26 | |
27 | MODULE_LICENSE("GPL"); | |
28 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
2ae15b64 | 29 | MODULE_DESCRIPTION("Xtables: IPv4 packet logging to syslog"); |
1da177e4 | 30 | |
1da177e4 LT |
31 | /* Use lock to serialize, so printks don't overlap */ |
32 | static DEFINE_SPINLOCK(log_lock); | |
33 | ||
34 | /* One level of recursion won't kill us */ | |
608c8e4f | 35 | static void dump_packet(const struct nf_loginfo *info, |
1da177e4 LT |
36 | const struct sk_buff *skb, |
37 | unsigned int iphoff) | |
38 | { | |
a47362a2 JE |
39 | struct iphdr _iph; |
40 | const struct iphdr *ih; | |
608c8e4f HW |
41 | unsigned int logflags; |
42 | ||
43 | if (info->type == NF_LOG_TYPE_LOG) | |
44 | logflags = info->u.log.logflags; | |
45 | else | |
46 | logflags = NF_LOG_MASK; | |
1da177e4 LT |
47 | |
48 | ih = skb_header_pointer(skb, iphoff, sizeof(_iph), &_iph); | |
49 | if (ih == NULL) { | |
50 | printk("TRUNCATED"); | |
51 | return; | |
52 | } | |
53 | ||
54 | /* Important fields: | |
55 | * TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */ | |
56 | /* Max length: 40 "SRC=255.255.255.255 DST=255.255.255.255 " */ | |
57 | printk("SRC=%u.%u.%u.%u DST=%u.%u.%u.%u ", | |
58 | NIPQUAD(ih->saddr), NIPQUAD(ih->daddr)); | |
59 | ||
60 | /* Max length: 46 "LEN=65535 TOS=0xFF PREC=0xFF TTL=255 ID=65535 " */ | |
61 | printk("LEN=%u TOS=0x%02X PREC=0x%02X TTL=%u ID=%u ", | |
62 | ntohs(ih->tot_len), ih->tos & IPTOS_TOS_MASK, | |
63 | ih->tos & IPTOS_PREC_MASK, ih->ttl, ntohs(ih->id)); | |
64 | ||
65 | /* Max length: 6 "CE DF MF " */ | |
66 | if (ntohs(ih->frag_off) & IP_CE) | |
67 | printk("CE "); | |
68 | if (ntohs(ih->frag_off) & IP_DF) | |
69 | printk("DF "); | |
70 | if (ntohs(ih->frag_off) & IP_MF) | |
71 | printk("MF "); | |
72 | ||
73 | /* Max length: 11 "FRAG:65535 " */ | |
74 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
75 | printk("FRAG:%u ", ntohs(ih->frag_off) & IP_OFFSET); | |
76 | ||
608c8e4f | 77 | if ((logflags & IPT_LOG_IPOPT) |
1da177e4 LT |
78 | && ih->ihl * 4 > sizeof(struct iphdr)) { |
79 | unsigned char _opt[4 * 15 - sizeof(struct iphdr)], *op; | |
80 | unsigned int i, optsize; | |
81 | ||
82 | optsize = ih->ihl * 4 - sizeof(struct iphdr); | |
83 | op = skb_header_pointer(skb, iphoff+sizeof(_iph), | |
84 | optsize, _opt); | |
85 | if (op == NULL) { | |
86 | printk("TRUNCATED"); | |
87 | return; | |
88 | } | |
89 | ||
90 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ | |
91 | printk("OPT ("); | |
92 | for (i = 0; i < optsize; i++) | |
93 | printk("%02X", op[i]); | |
94 | printk(") "); | |
95 | } | |
96 | ||
97 | switch (ih->protocol) { | |
98 | case IPPROTO_TCP: { | |
a47362a2 JE |
99 | struct tcphdr _tcph; |
100 | const struct tcphdr *th; | |
1da177e4 LT |
101 | |
102 | /* Max length: 10 "PROTO=TCP " */ | |
103 | printk("PROTO=TCP "); | |
104 | ||
105 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
106 | break; | |
107 | ||
108 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
109 | th = skb_header_pointer(skb, iphoff + ih->ihl * 4, | |
110 | sizeof(_tcph), &_tcph); | |
111 | if (th == NULL) { | |
112 | printk("INCOMPLETE [%u bytes] ", | |
113 | skb->len - iphoff - ih->ihl*4); | |
114 | break; | |
115 | } | |
116 | ||
117 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
118 | printk("SPT=%u DPT=%u ", | |
119 | ntohs(th->source), ntohs(th->dest)); | |
120 | /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */ | |
608c8e4f | 121 | if (logflags & IPT_LOG_TCPSEQ) |
1da177e4 LT |
122 | printk("SEQ=%u ACK=%u ", |
123 | ntohl(th->seq), ntohl(th->ack_seq)); | |
124 | /* Max length: 13 "WINDOW=65535 " */ | |
125 | printk("WINDOW=%u ", ntohs(th->window)); | |
126 | /* Max length: 9 "RES=0x3F " */ | |
127 | printk("RES=0x%02x ", (u8)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22)); | |
128 | /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */ | |
129 | if (th->cwr) | |
130 | printk("CWR "); | |
131 | if (th->ece) | |
132 | printk("ECE "); | |
133 | if (th->urg) | |
134 | printk("URG "); | |
135 | if (th->ack) | |
136 | printk("ACK "); | |
137 | if (th->psh) | |
138 | printk("PSH "); | |
139 | if (th->rst) | |
140 | printk("RST "); | |
141 | if (th->syn) | |
142 | printk("SYN "); | |
143 | if (th->fin) | |
144 | printk("FIN "); | |
145 | /* Max length: 11 "URGP=65535 " */ | |
146 | printk("URGP=%u ", ntohs(th->urg_ptr)); | |
147 | ||
608c8e4f | 148 | if ((logflags & IPT_LOG_TCPOPT) |
1da177e4 LT |
149 | && th->doff * 4 > sizeof(struct tcphdr)) { |
150 | unsigned char _opt[4 * 15 - sizeof(struct tcphdr)]; | |
a47362a2 | 151 | const unsigned char *op; |
1da177e4 LT |
152 | unsigned int i, optsize; |
153 | ||
154 | optsize = th->doff * 4 - sizeof(struct tcphdr); | |
155 | op = skb_header_pointer(skb, | |
156 | iphoff+ih->ihl*4+sizeof(_tcph), | |
157 | optsize, _opt); | |
158 | if (op == NULL) { | |
159 | printk("TRUNCATED"); | |
160 | return; | |
161 | } | |
162 | ||
163 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ | |
164 | printk("OPT ("); | |
165 | for (i = 0; i < optsize; i++) | |
166 | printk("%02X", op[i]); | |
167 | printk(") "); | |
168 | } | |
169 | break; | |
170 | } | |
ba4e58ec GR |
171 | case IPPROTO_UDP: |
172 | case IPPROTO_UDPLITE: { | |
a47362a2 JE |
173 | struct udphdr _udph; |
174 | const struct udphdr *uh; | |
1da177e4 | 175 | |
ba4e58ec GR |
176 | if (ih->protocol == IPPROTO_UDP) |
177 | /* Max length: 10 "PROTO=UDP " */ | |
178 | printk("PROTO=UDP " ); | |
179 | else /* Max length: 14 "PROTO=UDPLITE " */ | |
180 | printk("PROTO=UDPLITE "); | |
1da177e4 LT |
181 | |
182 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
183 | break; | |
184 | ||
185 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
186 | uh = skb_header_pointer(skb, iphoff+ih->ihl*4, | |
187 | sizeof(_udph), &_udph); | |
188 | if (uh == NULL) { | |
189 | printk("INCOMPLETE [%u bytes] ", | |
190 | skb->len - iphoff - ih->ihl*4); | |
191 | break; | |
192 | } | |
193 | ||
194 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
195 | printk("SPT=%u DPT=%u LEN=%u ", | |
196 | ntohs(uh->source), ntohs(uh->dest), | |
197 | ntohs(uh->len)); | |
198 | break; | |
199 | } | |
200 | case IPPROTO_ICMP: { | |
a47362a2 JE |
201 | struct icmphdr _icmph; |
202 | const struct icmphdr *ich; | |
9b5b5cff | 203 | static const size_t required_len[NR_ICMP_TYPES+1] |
1da177e4 LT |
204 | = { [ICMP_ECHOREPLY] = 4, |
205 | [ICMP_DEST_UNREACH] | |
206 | = 8 + sizeof(struct iphdr), | |
207 | [ICMP_SOURCE_QUENCH] | |
208 | = 8 + sizeof(struct iphdr), | |
209 | [ICMP_REDIRECT] | |
210 | = 8 + sizeof(struct iphdr), | |
211 | [ICMP_ECHO] = 4, | |
212 | [ICMP_TIME_EXCEEDED] | |
213 | = 8 + sizeof(struct iphdr), | |
214 | [ICMP_PARAMETERPROB] | |
215 | = 8 + sizeof(struct iphdr), | |
216 | [ICMP_TIMESTAMP] = 20, | |
217 | [ICMP_TIMESTAMPREPLY] = 20, | |
218 | [ICMP_ADDRESS] = 12, | |
219 | [ICMP_ADDRESSREPLY] = 12 }; | |
220 | ||
221 | /* Max length: 11 "PROTO=ICMP " */ | |
222 | printk("PROTO=ICMP "); | |
223 | ||
224 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
225 | break; | |
226 | ||
227 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
228 | ich = skb_header_pointer(skb, iphoff + ih->ihl * 4, | |
229 | sizeof(_icmph), &_icmph); | |
230 | if (ich == NULL) { | |
231 | printk("INCOMPLETE [%u bytes] ", | |
232 | skb->len - iphoff - ih->ihl*4); | |
233 | break; | |
234 | } | |
235 | ||
236 | /* Max length: 18 "TYPE=255 CODE=255 " */ | |
237 | printk("TYPE=%u CODE=%u ", ich->type, ich->code); | |
238 | ||
239 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
240 | if (ich->type <= NR_ICMP_TYPES | |
241 | && required_len[ich->type] | |
242 | && skb->len-iphoff-ih->ihl*4 < required_len[ich->type]) { | |
243 | printk("INCOMPLETE [%u bytes] ", | |
244 | skb->len - iphoff - ih->ihl*4); | |
245 | break; | |
246 | } | |
247 | ||
248 | switch (ich->type) { | |
249 | case ICMP_ECHOREPLY: | |
250 | case ICMP_ECHO: | |
251 | /* Max length: 19 "ID=65535 SEQ=65535 " */ | |
252 | printk("ID=%u SEQ=%u ", | |
253 | ntohs(ich->un.echo.id), | |
254 | ntohs(ich->un.echo.sequence)); | |
255 | break; | |
256 | ||
257 | case ICMP_PARAMETERPROB: | |
258 | /* Max length: 14 "PARAMETER=255 " */ | |
259 | printk("PARAMETER=%u ", | |
260 | ntohl(ich->un.gateway) >> 24); | |
261 | break; | |
262 | case ICMP_REDIRECT: | |
263 | /* Max length: 24 "GATEWAY=255.255.255.255 " */ | |
264 | printk("GATEWAY=%u.%u.%u.%u ", | |
265 | NIPQUAD(ich->un.gateway)); | |
266 | /* Fall through */ | |
267 | case ICMP_DEST_UNREACH: | |
268 | case ICMP_SOURCE_QUENCH: | |
269 | case ICMP_TIME_EXCEEDED: | |
270 | /* Max length: 3+maxlen */ | |
271 | if (!iphoff) { /* Only recurse once. */ | |
272 | printk("["); | |
273 | dump_packet(info, skb, | |
274 | iphoff + ih->ihl*4+sizeof(_icmph)); | |
275 | printk("] "); | |
276 | } | |
277 | ||
278 | /* Max length: 10 "MTU=65535 " */ | |
279 | if (ich->type == ICMP_DEST_UNREACH | |
280 | && ich->code == ICMP_FRAG_NEEDED) | |
281 | printk("MTU=%u ", ntohs(ich->un.frag.mtu)); | |
282 | } | |
283 | break; | |
284 | } | |
285 | /* Max Length */ | |
286 | case IPPROTO_AH: { | |
a47362a2 JE |
287 | struct ip_auth_hdr _ahdr; |
288 | const struct ip_auth_hdr *ah; | |
1da177e4 LT |
289 | |
290 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
291 | break; | |
e905a9ed | 292 | |
1da177e4 LT |
293 | /* Max length: 9 "PROTO=AH " */ |
294 | printk("PROTO=AH "); | |
295 | ||
296 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
297 | ah = skb_header_pointer(skb, iphoff+ih->ihl*4, | |
298 | sizeof(_ahdr), &_ahdr); | |
299 | if (ah == NULL) { | |
300 | printk("INCOMPLETE [%u bytes] ", | |
301 | skb->len - iphoff - ih->ihl*4); | |
302 | break; | |
303 | } | |
304 | ||
305 | /* Length: 15 "SPI=0xF1234567 " */ | |
306 | printk("SPI=0x%x ", ntohl(ah->spi)); | |
307 | break; | |
308 | } | |
309 | case IPPROTO_ESP: { | |
a47362a2 JE |
310 | struct ip_esp_hdr _esph; |
311 | const struct ip_esp_hdr *eh; | |
1da177e4 LT |
312 | |
313 | /* Max length: 10 "PROTO=ESP " */ | |
314 | printk("PROTO=ESP "); | |
315 | ||
316 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
317 | break; | |
318 | ||
319 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
320 | eh = skb_header_pointer(skb, iphoff+ih->ihl*4, | |
321 | sizeof(_esph), &_esph); | |
322 | if (eh == NULL) { | |
323 | printk("INCOMPLETE [%u bytes] ", | |
324 | skb->len - iphoff - ih->ihl*4); | |
325 | break; | |
326 | } | |
327 | ||
328 | /* Length: 15 "SPI=0xF1234567 " */ | |
329 | printk("SPI=0x%x ", ntohl(eh->spi)); | |
330 | break; | |
331 | } | |
332 | /* Max length: 10 "PROTO 255 " */ | |
333 | default: | |
334 | printk("PROTO=%u ", ih->protocol); | |
335 | } | |
336 | ||
337 | /* Max length: 15 "UID=4294967295 " */ | |
e905a9ed | 338 | if ((logflags & IPT_LOG_UID) && !iphoff && skb->sk) { |
1da177e4 LT |
339 | read_lock_bh(&skb->sk->sk_callback_lock); |
340 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) | |
17dfc93f MS |
341 | printk("UID=%u GID=%u", |
342 | skb->sk->sk_socket->file->f_uid, | |
343 | skb->sk->sk_socket->file->f_gid); | |
1da177e4 LT |
344 | read_unlock_bh(&skb->sk->sk_callback_lock); |
345 | } | |
346 | ||
347 | /* Proto Max log string length */ | |
348 | /* IP: 40+46+6+11+127 = 230 */ | |
349 | /* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */ | |
350 | /* UDP: 10+max(25,20) = 35 */ | |
ba4e58ec | 351 | /* UDPLITE: 14+max(25,20) = 39 */ |
1da177e4 LT |
352 | /* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */ |
353 | /* ESP: 10+max(25)+15 = 50 */ | |
354 | /* AH: 9+max(25)+15 = 49 */ | |
355 | /* unknown: 10 */ | |
356 | ||
357 | /* (ICMP allows recursion one level deep) */ | |
358 | /* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */ | |
359 | /* maxlen = 230+ 91 + 230 + 252 = 803 */ | |
360 | } | |
361 | ||
d127e94a | 362 | static struct nf_loginfo default_loginfo = { |
608c8e4f HW |
363 | .type = NF_LOG_TYPE_LOG, |
364 | .u = { | |
365 | .log = { | |
366 | .level = 0, | |
367 | .logflags = NF_LOG_MASK, | |
368 | }, | |
369 | }, | |
370 | }; | |
371 | ||
1da177e4 | 372 | static void |
608c8e4f HW |
373 | ipt_log_packet(unsigned int pf, |
374 | unsigned int hooknum, | |
1da177e4 LT |
375 | const struct sk_buff *skb, |
376 | const struct net_device *in, | |
377 | const struct net_device *out, | |
608c8e4f | 378 | const struct nf_loginfo *loginfo, |
1da177e4 LT |
379 | const char *prefix) |
380 | { | |
608c8e4f HW |
381 | if (!loginfo) |
382 | loginfo = &default_loginfo; | |
383 | ||
1da177e4 | 384 | spin_lock_bh(&log_lock); |
608c8e4f HW |
385 | printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level, |
386 | prefix, | |
1da177e4 LT |
387 | in ? in->name : "", |
388 | out ? out->name : ""); | |
389 | #ifdef CONFIG_BRIDGE_NETFILTER | |
390 | if (skb->nf_bridge) { | |
a47362a2 JE |
391 | const struct net_device *physindev; |
392 | const struct net_device *physoutdev; | |
1da177e4 | 393 | |
a47362a2 | 394 | physindev = skb->nf_bridge->physindev; |
1da177e4 LT |
395 | if (physindev && in != physindev) |
396 | printk("PHYSIN=%s ", physindev->name); | |
a47362a2 | 397 | physoutdev = skb->nf_bridge->physoutdev; |
1da177e4 LT |
398 | if (physoutdev && out != physoutdev) |
399 | printk("PHYSOUT=%s ", physoutdev->name); | |
400 | } | |
401 | #endif | |
402 | ||
403 | if (in && !out) { | |
404 | /* MAC logging for input chain only. */ | |
405 | printk("MAC="); | |
406 | if (skb->dev && skb->dev->hard_header_len | |
b0e380b1 | 407 | && skb->mac_header != skb->network_header) { |
1da177e4 | 408 | int i; |
98e399f8 | 409 | const unsigned char *p = skb_mac_header(skb); |
1da177e4 LT |
410 | for (i = 0; i < skb->dev->hard_header_len; i++,p++) |
411 | printk("%02x%c", *p, | |
412 | i==skb->dev->hard_header_len - 1 | |
413 | ? ' ':':'); | |
414 | } else | |
415 | printk(" "); | |
416 | } | |
417 | ||
418 | dump_packet(loginfo, skb, 0); | |
419 | printk("\n"); | |
420 | spin_unlock_bh(&log_lock); | |
421 | } | |
422 | ||
423 | static unsigned int | |
d3c5ee6d JE |
424 | log_tg(struct sk_buff *skb, const struct net_device *in, |
425 | const struct net_device *out, unsigned int hooknum, | |
426 | const struct xt_target *target, const void *targinfo) | |
1da177e4 LT |
427 | { |
428 | const struct ipt_log_info *loginfo = targinfo; | |
608c8e4f | 429 | struct nf_loginfo li; |
1da177e4 | 430 | |
608c8e4f HW |
431 | li.type = NF_LOG_TYPE_LOG; |
432 | li.u.log.level = loginfo->level; | |
433 | li.u.log.logflags = loginfo->logflags; | |
1da177e4 | 434 | |
3db05fea | 435 | ipt_log_packet(PF_INET, hooknum, skb, in, out, &li, |
e905a9ed | 436 | loginfo->prefix); |
6709dbbb | 437 | return XT_CONTINUE; |
1da177e4 LT |
438 | } |
439 | ||
d3c5ee6d JE |
440 | static bool |
441 | log_tg_check(const char *tablename, const void *e, | |
442 | const struct xt_target *target, void *targinfo, | |
443 | unsigned int hook_mask) | |
1da177e4 LT |
444 | { |
445 | const struct ipt_log_info *loginfo = targinfo; | |
446 | ||
1da177e4 | 447 | if (loginfo->level >= 8) { |
0d53778e | 448 | pr_debug("LOG: level %u >= 8\n", loginfo->level); |
e1931b78 | 449 | return false; |
1da177e4 | 450 | } |
1da177e4 | 451 | if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') { |
0d53778e PM |
452 | pr_debug("LOG: prefix term %i\n", |
453 | loginfo->prefix[sizeof(loginfo->prefix)-1]); | |
e1931b78 | 454 | return false; |
1da177e4 | 455 | } |
e1931b78 | 456 | return true; |
1da177e4 LT |
457 | } |
458 | ||
d3c5ee6d | 459 | static struct xt_target log_tg_reg __read_mostly = { |
1da177e4 | 460 | .name = "LOG", |
6709dbbb | 461 | .family = AF_INET, |
d3c5ee6d | 462 | .target = log_tg, |
1d5cd909 | 463 | .targetsize = sizeof(struct ipt_log_info), |
d3c5ee6d | 464 | .checkentry = log_tg_check, |
1da177e4 LT |
465 | .me = THIS_MODULE, |
466 | }; | |
467 | ||
7b2f9631 | 468 | static const struct nf_logger ipt_log_logger ={ |
608c8e4f HW |
469 | .name = "ipt_LOG", |
470 | .logfn = &ipt_log_packet, | |
471 | .me = THIS_MODULE, | |
472 | }; | |
473 | ||
d3c5ee6d | 474 | static int __init log_tg_init(void) |
1da177e4 | 475 | { |
e1fd0586 JE |
476 | int ret; |
477 | ||
d3c5ee6d | 478 | ret = xt_register_target(&log_tg_reg); |
e1fd0586 JE |
479 | if (ret < 0) |
480 | return ret; | |
7e2acc7e PM |
481 | nf_log_register(PF_INET, &ipt_log_logger); |
482 | return 0; | |
1da177e4 LT |
483 | } |
484 | ||
d3c5ee6d | 485 | static void __exit log_tg_exit(void) |
1da177e4 | 486 | { |
e92ad99c | 487 | nf_log_unregister(&ipt_log_logger); |
d3c5ee6d | 488 | xt_unregister_target(&log_tg_reg); |
1da177e4 LT |
489 | } |
490 | ||
d3c5ee6d JE |
491 | module_init(log_tg_init); |
492 | module_exit(log_tg_exit); |