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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) 2001 Jan Rekorajski <baggins@pld.org.pl> | |
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/moduleparam.h> | |
15 | #include <linux/skbuff.h> | |
14c85021 | 16 | #include <linux/if_arp.h> |
1da177e4 LT |
17 | #include <linux/ip.h> |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/icmpv6.h> | |
20 | #include <net/udp.h> | |
21 | #include <net/tcp.h> | |
22 | #include <net/ipv6.h> | |
23 | #include <linux/netfilter.h> | |
6709dbbb | 24 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
25 | #include <linux/netfilter_ipv6/ip6_tables.h> |
26 | ||
27 | MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>"); | |
28 | MODULE_DESCRIPTION("IP6 tables LOG target module"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
1da177e4 LT |
31 | struct in_device; |
32 | #include <net/route.h> | |
33 | #include <linux/netfilter_ipv6/ip6t_LOG.h> | |
34 | ||
35 | #if 0 | |
36 | #define DEBUGP printk | |
37 | #else | |
38 | #define DEBUGP(format, args...) | |
39 | #endif | |
40 | ||
41 | /* Use lock to serialize, so printks don't overlap */ | |
42 | static DEFINE_SPINLOCK(log_lock); | |
43 | ||
44 | /* One level of recursion won't kill us */ | |
608c8e4f | 45 | static void dump_packet(const struct nf_loginfo *info, |
1da177e4 LT |
46 | const struct sk_buff *skb, unsigned int ip6hoff, |
47 | int recurse) | |
48 | { | |
49 | u_int8_t currenthdr; | |
50 | int fragment; | |
51 | struct ipv6hdr _ip6h, *ih; | |
52 | unsigned int ptr; | |
53 | unsigned int hdrlen = 0; | |
608c8e4f HW |
54 | unsigned int logflags; |
55 | ||
56 | if (info->type == NF_LOG_TYPE_LOG) | |
57 | logflags = info->u.log.logflags; | |
58 | else | |
59 | logflags = NF_LOG_MASK; | |
1da177e4 LT |
60 | |
61 | ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h); | |
62 | if (ih == NULL) { | |
63 | printk("TRUNCATED"); | |
64 | return; | |
65 | } | |
66 | ||
46b86a2d JP |
67 | /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */ |
68 | printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr)); | |
1da177e4 LT |
69 | |
70 | /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */ | |
71 | printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ", | |
72 | ntohs(ih->payload_len) + sizeof(struct ipv6hdr), | |
e69a4adc | 73 | (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20, |
1da177e4 | 74 | ih->hop_limit, |
e69a4adc | 75 | (ntohl(*(__be32 *)ih) & 0x000fffff)); |
1da177e4 LT |
76 | |
77 | fragment = 0; | |
78 | ptr = ip6hoff + sizeof(struct ipv6hdr); | |
79 | currenthdr = ih->nexthdr; | |
80 | while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) { | |
81 | struct ipv6_opt_hdr _hdr, *hp; | |
82 | ||
83 | hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr); | |
84 | if (hp == NULL) { | |
85 | printk("TRUNCATED"); | |
86 | return; | |
87 | } | |
88 | ||
89 | /* Max length: 48 "OPT (...) " */ | |
608c8e4f | 90 | if (logflags & IP6T_LOG_IPOPT) |
1da177e4 LT |
91 | printk("OPT ( "); |
92 | ||
93 | switch (currenthdr) { | |
94 | case IPPROTO_FRAGMENT: { | |
95 | struct frag_hdr _fhdr, *fh; | |
96 | ||
97 | printk("FRAG:"); | |
98 | fh = skb_header_pointer(skb, ptr, sizeof(_fhdr), | |
99 | &_fhdr); | |
100 | if (fh == NULL) { | |
101 | printk("TRUNCATED "); | |
102 | return; | |
103 | } | |
104 | ||
105 | /* Max length: 6 "65535 " */ | |
106 | printk("%u ", ntohs(fh->frag_off) & 0xFFF8); | |
107 | ||
108 | /* Max length: 11 "INCOMPLETE " */ | |
109 | if (fh->frag_off & htons(0x0001)) | |
110 | printk("INCOMPLETE "); | |
111 | ||
112 | printk("ID:%08x ", ntohl(fh->identification)); | |
113 | ||
114 | if (ntohs(fh->frag_off) & 0xFFF8) | |
115 | fragment = 1; | |
116 | ||
117 | hdrlen = 8; | |
118 | ||
119 | break; | |
120 | } | |
121 | case IPPROTO_DSTOPTS: | |
122 | case IPPROTO_ROUTING: | |
123 | case IPPROTO_HOPOPTS: | |
124 | if (fragment) { | |
608c8e4f | 125 | if (logflags & IP6T_LOG_IPOPT) |
1da177e4 LT |
126 | printk(")"); |
127 | return; | |
128 | } | |
129 | hdrlen = ipv6_optlen(hp); | |
130 | break; | |
131 | /* Max Length */ | |
132 | case IPPROTO_AH: | |
608c8e4f | 133 | if (logflags & IP6T_LOG_IPOPT) { |
1da177e4 LT |
134 | struct ip_auth_hdr _ahdr, *ah; |
135 | ||
136 | /* Max length: 3 "AH " */ | |
137 | printk("AH "); | |
138 | ||
139 | if (fragment) { | |
140 | printk(")"); | |
141 | return; | |
142 | } | |
143 | ||
144 | ah = skb_header_pointer(skb, ptr, sizeof(_ahdr), | |
145 | &_ahdr); | |
146 | if (ah == NULL) { | |
147 | /* | |
1ab1457c | 148 | * Max length: 26 "INCOMPLETE [65535 |
1da177e4 LT |
149 | * bytes] )" |
150 | */ | |
151 | printk("INCOMPLETE [%u bytes] )", | |
152 | skb->len - ptr); | |
153 | return; | |
154 | } | |
155 | ||
156 | /* Length: 15 "SPI=0xF1234567 */ | |
157 | printk("SPI=0x%x ", ntohl(ah->spi)); | |
158 | ||
159 | } | |
160 | ||
161 | hdrlen = (hp->hdrlen+2)<<2; | |
162 | break; | |
163 | case IPPROTO_ESP: | |
608c8e4f | 164 | if (logflags & IP6T_LOG_IPOPT) { |
1da177e4 LT |
165 | struct ip_esp_hdr _esph, *eh; |
166 | ||
167 | /* Max length: 4 "ESP " */ | |
168 | printk("ESP "); | |
169 | ||
170 | if (fragment) { | |
171 | printk(")"); | |
172 | return; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Max length: 26 "INCOMPLETE [65535 bytes] )" | |
177 | */ | |
178 | eh = skb_header_pointer(skb, ptr, sizeof(_esph), | |
179 | &_esph); | |
180 | if (eh == NULL) { | |
181 | printk("INCOMPLETE [%u bytes] )", | |
182 | skb->len - ptr); | |
183 | return; | |
184 | } | |
185 | ||
186 | /* Length: 16 "SPI=0xF1234567 )" */ | |
187 | printk("SPI=0x%x )", ntohl(eh->spi) ); | |
188 | ||
189 | } | |
190 | return; | |
191 | default: | |
192 | /* Max length: 20 "Unknown Ext Hdr 255" */ | |
193 | printk("Unknown Ext Hdr %u", currenthdr); | |
194 | return; | |
195 | } | |
608c8e4f | 196 | if (logflags & IP6T_LOG_IPOPT) |
1da177e4 LT |
197 | printk(") "); |
198 | ||
199 | currenthdr = hp->nexthdr; | |
200 | ptr += hdrlen; | |
201 | } | |
202 | ||
203 | switch (currenthdr) { | |
204 | case IPPROTO_TCP: { | |
205 | struct tcphdr _tcph, *th; | |
206 | ||
207 | /* Max length: 10 "PROTO=TCP " */ | |
208 | printk("PROTO=TCP "); | |
209 | ||
210 | if (fragment) | |
211 | break; | |
212 | ||
213 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
214 | th = skb_header_pointer(skb, ptr, sizeof(_tcph), &_tcph); | |
215 | if (th == NULL) { | |
216 | printk("INCOMPLETE [%u bytes] ", skb->len - ptr); | |
217 | return; | |
218 | } | |
219 | ||
220 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
221 | printk("SPT=%u DPT=%u ", | |
222 | ntohs(th->source), ntohs(th->dest)); | |
223 | /* Max length: 30 "SEQ=4294967295 ACK=4294967295 " */ | |
608c8e4f | 224 | if (logflags & IP6T_LOG_TCPSEQ) |
1da177e4 LT |
225 | printk("SEQ=%u ACK=%u ", |
226 | ntohl(th->seq), ntohl(th->ack_seq)); | |
227 | /* Max length: 13 "WINDOW=65535 " */ | |
228 | printk("WINDOW=%u ", ntohs(th->window)); | |
229 | /* Max length: 9 "RES=0x3C " */ | |
230 | printk("RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) & TCP_RESERVED_BITS) >> 22)); | |
231 | /* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */ | |
232 | if (th->cwr) | |
233 | printk("CWR "); | |
234 | if (th->ece) | |
235 | printk("ECE "); | |
236 | if (th->urg) | |
237 | printk("URG "); | |
238 | if (th->ack) | |
239 | printk("ACK "); | |
240 | if (th->psh) | |
241 | printk("PSH "); | |
242 | if (th->rst) | |
243 | printk("RST "); | |
244 | if (th->syn) | |
245 | printk("SYN "); | |
246 | if (th->fin) | |
247 | printk("FIN "); | |
248 | /* Max length: 11 "URGP=65535 " */ | |
249 | printk("URGP=%u ", ntohs(th->urg_ptr)); | |
250 | ||
608c8e4f | 251 | if ((logflags & IP6T_LOG_TCPOPT) |
1da177e4 LT |
252 | && th->doff * 4 > sizeof(struct tcphdr)) { |
253 | u_int8_t _opt[60 - sizeof(struct tcphdr)], *op; | |
254 | unsigned int i; | |
255 | unsigned int optsize = th->doff * 4 | |
256 | - sizeof(struct tcphdr); | |
257 | ||
258 | op = skb_header_pointer(skb, | |
259 | ptr + sizeof(struct tcphdr), | |
260 | optsize, _opt); | |
261 | if (op == NULL) { | |
262 | printk("OPT (TRUNCATED)"); | |
263 | return; | |
264 | } | |
265 | ||
266 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ | |
267 | printk("OPT ("); | |
268 | for (i =0; i < optsize; i++) | |
269 | printk("%02X", op[i]); | |
270 | printk(") "); | |
271 | } | |
272 | break; | |
273 | } | |
ba4e58ec GR |
274 | case IPPROTO_UDP: |
275 | case IPPROTO_UDPLITE: { | |
1da177e4 LT |
276 | struct udphdr _udph, *uh; |
277 | ||
ba4e58ec GR |
278 | if (currenthdr == IPPROTO_UDP) |
279 | /* Max length: 10 "PROTO=UDP " */ | |
280 | printk("PROTO=UDP " ); | |
281 | else /* Max length: 14 "PROTO=UDPLITE " */ | |
282 | printk("PROTO=UDPLITE "); | |
1da177e4 LT |
283 | |
284 | if (fragment) | |
285 | break; | |
286 | ||
287 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
288 | uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph); | |
289 | if (uh == NULL) { | |
290 | printk("INCOMPLETE [%u bytes] ", skb->len - ptr); | |
291 | return; | |
292 | } | |
293 | ||
294 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
295 | printk("SPT=%u DPT=%u LEN=%u ", | |
296 | ntohs(uh->source), ntohs(uh->dest), | |
297 | ntohs(uh->len)); | |
298 | break; | |
299 | } | |
300 | case IPPROTO_ICMPV6: { | |
301 | struct icmp6hdr _icmp6h, *ic; | |
302 | ||
303 | /* Max length: 13 "PROTO=ICMPv6 " */ | |
304 | printk("PROTO=ICMPv6 "); | |
305 | ||
306 | if (fragment) | |
307 | break; | |
308 | ||
309 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
310 | ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h); | |
311 | if (ic == NULL) { | |
312 | printk("INCOMPLETE [%u bytes] ", skb->len - ptr); | |
313 | return; | |
314 | } | |
315 | ||
316 | /* Max length: 18 "TYPE=255 CODE=255 " */ | |
317 | printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code); | |
318 | ||
319 | switch (ic->icmp6_type) { | |
320 | case ICMPV6_ECHO_REQUEST: | |
321 | case ICMPV6_ECHO_REPLY: | |
322 | /* Max length: 19 "ID=65535 SEQ=65535 " */ | |
323 | printk("ID=%u SEQ=%u ", | |
324 | ntohs(ic->icmp6_identifier), | |
325 | ntohs(ic->icmp6_sequence)); | |
326 | break; | |
327 | case ICMPV6_MGM_QUERY: | |
328 | case ICMPV6_MGM_REPORT: | |
329 | case ICMPV6_MGM_REDUCTION: | |
330 | break; | |
331 | ||
332 | case ICMPV6_PARAMPROB: | |
333 | /* Max length: 17 "POINTER=ffffffff " */ | |
334 | printk("POINTER=%08x ", ntohl(ic->icmp6_pointer)); | |
335 | /* Fall through */ | |
336 | case ICMPV6_DEST_UNREACH: | |
337 | case ICMPV6_PKT_TOOBIG: | |
338 | case ICMPV6_TIME_EXCEED: | |
339 | /* Max length: 3+maxlen */ | |
340 | if (recurse) { | |
341 | printk("["); | |
342 | dump_packet(info, skb, ptr + sizeof(_icmp6h), | |
343 | 0); | |
344 | printk("] "); | |
345 | } | |
346 | ||
347 | /* Max length: 10 "MTU=65535 " */ | |
348 | if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) | |
349 | printk("MTU=%u ", ntohl(ic->icmp6_mtu)); | |
350 | } | |
351 | break; | |
352 | } | |
353 | /* Max length: 10 "PROTO=255 " */ | |
354 | default: | |
355 | printk("PROTO=%u ", currenthdr); | |
356 | } | |
357 | ||
358 | /* Max length: 15 "UID=4294967295 " */ | |
608c8e4f | 359 | if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) { |
1da177e4 LT |
360 | read_lock_bh(&skb->sk->sk_callback_lock); |
361 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) | |
362 | printk("UID=%u ", skb->sk->sk_socket->file->f_uid); | |
363 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
364 | } | |
365 | } | |
366 | ||
608c8e4f HW |
367 | static struct nf_loginfo default_loginfo = { |
368 | .type = NF_LOG_TYPE_LOG, | |
369 | .u = { | |
370 | .log = { | |
371 | .level = 0, | |
372 | .logflags = NF_LOG_MASK, | |
373 | }, | |
374 | }, | |
375 | }; | |
376 | ||
1da177e4 | 377 | static void |
608c8e4f HW |
378 | ip6t_log_packet(unsigned int pf, |
379 | unsigned int hooknum, | |
1da177e4 LT |
380 | const struct sk_buff *skb, |
381 | const struct net_device *in, | |
382 | const struct net_device *out, | |
608c8e4f | 383 | const struct nf_loginfo *loginfo, |
1da177e4 LT |
384 | const char *prefix) |
385 | { | |
608c8e4f HW |
386 | if (!loginfo) |
387 | loginfo = &default_loginfo; | |
388 | ||
1da177e4 | 389 | spin_lock_bh(&log_lock); |
1ab1457c | 390 | printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level, |
608c8e4f | 391 | prefix, |
1da177e4 LT |
392 | in ? in->name : "", |
393 | out ? out->name : ""); | |
394 | if (in && !out) { | |
d3984a6b | 395 | unsigned int len; |
1da177e4 LT |
396 | /* MAC logging for input chain only. */ |
397 | printk("MAC="); | |
d3984a6b | 398 | if (skb->dev && (len = skb->dev->hard_header_len) && |
047601bf PM |
399 | skb->mac.raw != skb->nh.raw) { |
400 | unsigned char *p = skb->mac.raw; | |
401 | int i; | |
402 | ||
403 | if (skb->dev->type == ARPHRD_SIT && | |
404 | (p -= ETH_HLEN) < skb->head) | |
405 | p = NULL; | |
406 | ||
d3984a6b PM |
407 | if (p != NULL) { |
408 | for (i = 0; i < len; i++) | |
409 | printk("%02x%s", p[i], | |
410 | i == len - 1 ? "" : ":"); | |
411 | } | |
047601bf PM |
412 | printk(" "); |
413 | ||
414 | if (skb->dev->type == ARPHRD_SIT) { | |
415 | struct iphdr *iph = (struct iphdr *)skb->mac.raw; | |
416 | printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ", | |
417 | NIPQUAD(iph->saddr), | |
418 | NIPQUAD(iph->daddr)); | |
1da177e4 LT |
419 | } |
420 | } else | |
421 | printk(" "); | |
422 | } | |
423 | ||
424 | dump_packet(loginfo, skb, (u8*)skb->nh.ipv6h - skb->data, 1); | |
425 | printk("\n"); | |
426 | spin_unlock_bh(&log_lock); | |
427 | } | |
428 | ||
429 | static unsigned int | |
430 | ip6t_log_target(struct sk_buff **pskb, | |
431 | const struct net_device *in, | |
432 | const struct net_device *out, | |
433 | unsigned int hooknum, | |
c4986734 | 434 | const struct xt_target *target, |
fe1cb108 | 435 | const void *targinfo) |
1da177e4 LT |
436 | { |
437 | const struct ip6t_log_info *loginfo = targinfo; | |
608c8e4f HW |
438 | struct nf_loginfo li; |
439 | ||
440 | li.type = NF_LOG_TYPE_LOG; | |
441 | li.u.log.level = loginfo->level; | |
442 | li.u.log.logflags = loginfo->logflags; | |
1da177e4 | 443 | |
baf7b1e1 | 444 | ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li, |
1ab1457c | 445 | loginfo->prefix); |
6709dbbb | 446 | return XT_CONTINUE; |
1da177e4 LT |
447 | } |
448 | ||
1da177e4 LT |
449 | |
450 | static int ip6t_log_checkentry(const char *tablename, | |
2e4e6a17 | 451 | const void *entry, |
c4986734 | 452 | const struct xt_target *target, |
1da177e4 | 453 | void *targinfo, |
1da177e4 LT |
454 | unsigned int hook_mask) |
455 | { | |
456 | const struct ip6t_log_info *loginfo = targinfo; | |
457 | ||
1da177e4 LT |
458 | if (loginfo->level >= 8) { |
459 | DEBUGP("LOG: level %u >= 8\n", loginfo->level); | |
460 | return 0; | |
461 | } | |
1da177e4 LT |
462 | if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') { |
463 | DEBUGP("LOG: prefix term %i\n", | |
464 | loginfo->prefix[sizeof(loginfo->prefix)-1]); | |
465 | return 0; | |
466 | } | |
1da177e4 LT |
467 | return 1; |
468 | } | |
469 | ||
6709dbbb | 470 | static struct xt_target ip6t_log_reg = { |
1da177e4 | 471 | .name = "LOG", |
6709dbbb | 472 | .family = AF_INET6, |
1ab1457c | 473 | .target = ip6t_log_target, |
7f939713 | 474 | .targetsize = sizeof(struct ip6t_log_info), |
1ab1457c | 475 | .checkentry = ip6t_log_checkentry, |
1da177e4 LT |
476 | .me = THIS_MODULE, |
477 | }; | |
478 | ||
608c8e4f HW |
479 | static struct nf_logger ip6t_logger = { |
480 | .name = "ip6t_LOG", | |
481 | .logfn = &ip6t_log_packet, | |
482 | .me = THIS_MODULE, | |
483 | }; | |
484 | ||
65b4b4e8 | 485 | static int __init ip6t_log_init(void) |
1da177e4 | 486 | { |
e1fd0586 JE |
487 | int ret; |
488 | ||
6709dbbb | 489 | ret = xt_register_target(&ip6t_log_reg); |
e1fd0586 JE |
490 | if (ret < 0) |
491 | return ret; | |
608c8e4f HW |
492 | if (nf_log_register(PF_INET6, &ip6t_logger) < 0) { |
493 | printk(KERN_WARNING "ip6t_LOG: not logging via system console " | |
494 | "since somebody else already registered for PF_INET6\n"); | |
495 | /* we cannot make module load fail here, since otherwise | |
496 | * ip6tables userspace would abort */ | |
497 | } | |
1da177e4 LT |
498 | |
499 | return 0; | |
500 | } | |
501 | ||
65b4b4e8 | 502 | static void __exit ip6t_log_fini(void) |
1da177e4 | 503 | { |
608c8e4f | 504 | nf_log_unregister_logger(&ip6t_logger); |
6709dbbb | 505 | xt_unregister_target(&ip6t_log_reg); |
1da177e4 LT |
506 | } |
507 | ||
65b4b4e8 AM |
508 | module_init(ip6t_log_init); |
509 | module_exit(ip6t_log_fini); |