Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
35 | /* Use lock to serialize, so printks don't overlap */ |
36 | static DEFINE_SPINLOCK(log_lock); | |
37 | ||
38 | /* One level of recursion won't kill us */ | |
608c8e4f | 39 | static void dump_packet(const struct nf_loginfo *info, |
1da177e4 LT |
40 | const struct sk_buff *skb, unsigned int ip6hoff, |
41 | int recurse) | |
42 | { | |
43 | u_int8_t currenthdr; | |
44 | int fragment; | |
a47362a2 JE |
45 | struct ipv6hdr _ip6h; |
46 | const struct ipv6hdr *ih; | |
1da177e4 LT |
47 | unsigned int ptr; |
48 | unsigned int hdrlen = 0; | |
608c8e4f HW |
49 | unsigned int logflags; |
50 | ||
51 | if (info->type == NF_LOG_TYPE_LOG) | |
52 | logflags = info->u.log.logflags; | |
53 | else | |
54 | logflags = NF_LOG_MASK; | |
1da177e4 LT |
55 | |
56 | ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h); | |
57 | if (ih == NULL) { | |
58 | printk("TRUNCATED"); | |
59 | return; | |
60 | } | |
61 | ||
46b86a2d JP |
62 | /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */ |
63 | printk("SRC=" NIP6_FMT " DST=" NIP6_FMT " ", NIP6(ih->saddr), NIP6(ih->daddr)); | |
1da177e4 LT |
64 | |
65 | /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */ | |
66 | printk("LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ", | |
67 | ntohs(ih->payload_len) + sizeof(struct ipv6hdr), | |
e69a4adc | 68 | (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20, |
1da177e4 | 69 | ih->hop_limit, |
e69a4adc | 70 | (ntohl(*(__be32 *)ih) & 0x000fffff)); |
1da177e4 LT |
71 | |
72 | fragment = 0; | |
73 | ptr = ip6hoff + sizeof(struct ipv6hdr); | |
74 | currenthdr = ih->nexthdr; | |
75 | while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) { | |
a47362a2 JE |
76 | struct ipv6_opt_hdr _hdr; |
77 | const struct ipv6_opt_hdr *hp; | |
1da177e4 LT |
78 | |
79 | hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr); | |
80 | if (hp == NULL) { | |
81 | printk("TRUNCATED"); | |
82 | return; | |
83 | } | |
84 | ||
85 | /* Max length: 48 "OPT (...) " */ | |
608c8e4f | 86 | if (logflags & IP6T_LOG_IPOPT) |
1da177e4 LT |
87 | printk("OPT ( "); |
88 | ||
89 | switch (currenthdr) { | |
90 | case IPPROTO_FRAGMENT: { | |
a47362a2 JE |
91 | struct frag_hdr _fhdr; |
92 | const struct frag_hdr *fh; | |
1da177e4 LT |
93 | |
94 | printk("FRAG:"); | |
95 | fh = skb_header_pointer(skb, ptr, sizeof(_fhdr), | |
96 | &_fhdr); | |
97 | if (fh == NULL) { | |
98 | printk("TRUNCATED "); | |
99 | return; | |
100 | } | |
101 | ||
102 | /* Max length: 6 "65535 " */ | |
103 | printk("%u ", ntohs(fh->frag_off) & 0xFFF8); | |
104 | ||
105 | /* Max length: 11 "INCOMPLETE " */ | |
106 | if (fh->frag_off & htons(0x0001)) | |
107 | printk("INCOMPLETE "); | |
108 | ||
109 | printk("ID:%08x ", ntohl(fh->identification)); | |
110 | ||
111 | if (ntohs(fh->frag_off) & 0xFFF8) | |
112 | fragment = 1; | |
113 | ||
114 | hdrlen = 8; | |
115 | ||
116 | break; | |
117 | } | |
118 | case IPPROTO_DSTOPTS: | |
119 | case IPPROTO_ROUTING: | |
120 | case IPPROTO_HOPOPTS: | |
121 | if (fragment) { | |
608c8e4f | 122 | if (logflags & IP6T_LOG_IPOPT) |
1da177e4 LT |
123 | printk(")"); |
124 | return; | |
125 | } | |
126 | hdrlen = ipv6_optlen(hp); | |
127 | break; | |
128 | /* Max Length */ | |
129 | case IPPROTO_AH: | |
608c8e4f | 130 | if (logflags & IP6T_LOG_IPOPT) { |
a47362a2 JE |
131 | struct ip_auth_hdr _ahdr; |
132 | const struct ip_auth_hdr *ah; | |
1da177e4 LT |
133 | |
134 | /* Max length: 3 "AH " */ | |
135 | printk("AH "); | |
136 | ||
137 | if (fragment) { | |
138 | printk(")"); | |
139 | return; | |
140 | } | |
141 | ||
142 | ah = skb_header_pointer(skb, ptr, sizeof(_ahdr), | |
143 | &_ahdr); | |
144 | if (ah == NULL) { | |
145 | /* | |
1ab1457c | 146 | * Max length: 26 "INCOMPLETE [65535 |
1da177e4 LT |
147 | * bytes] )" |
148 | */ | |
149 | printk("INCOMPLETE [%u bytes] )", | |
150 | skb->len - ptr); | |
151 | return; | |
152 | } | |
153 | ||
154 | /* Length: 15 "SPI=0xF1234567 */ | |
155 | printk("SPI=0x%x ", ntohl(ah->spi)); | |
156 | ||
157 | } | |
158 | ||
159 | hdrlen = (hp->hdrlen+2)<<2; | |
160 | break; | |
161 | case IPPROTO_ESP: | |
608c8e4f | 162 | if (logflags & IP6T_LOG_IPOPT) { |
a47362a2 JE |
163 | struct ip_esp_hdr _esph; |
164 | const struct ip_esp_hdr *eh; | |
1da177e4 LT |
165 | |
166 | /* Max length: 4 "ESP " */ | |
167 | printk("ESP "); | |
168 | ||
169 | if (fragment) { | |
170 | printk(")"); | |
171 | return; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Max length: 26 "INCOMPLETE [65535 bytes] )" | |
176 | */ | |
177 | eh = skb_header_pointer(skb, ptr, sizeof(_esph), | |
178 | &_esph); | |
179 | if (eh == NULL) { | |
180 | printk("INCOMPLETE [%u bytes] )", | |
181 | skb->len - ptr); | |
182 | return; | |
183 | } | |
184 | ||
185 | /* Length: 16 "SPI=0xF1234567 )" */ | |
186 | printk("SPI=0x%x )", ntohl(eh->spi) ); | |
187 | ||
188 | } | |
189 | return; | |
190 | default: | |
191 | /* Max length: 20 "Unknown Ext Hdr 255" */ | |
192 | printk("Unknown Ext Hdr %u", currenthdr); | |
193 | return; | |
194 | } | |
608c8e4f | 195 | if (logflags & IP6T_LOG_IPOPT) |
1da177e4 LT |
196 | printk(") "); |
197 | ||
198 | currenthdr = hp->nexthdr; | |
199 | ptr += hdrlen; | |
200 | } | |
201 | ||
202 | switch (currenthdr) { | |
203 | case IPPROTO_TCP: { | |
a47362a2 JE |
204 | struct tcphdr _tcph; |
205 | const struct tcphdr *th; | |
1da177e4 LT |
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 | 252 | && th->doff * 4 > sizeof(struct tcphdr)) { |
a47362a2 JE |
253 | u_int8_t _opt[60 - sizeof(struct tcphdr)]; |
254 | const u_int8_t *op; | |
1da177e4 LT |
255 | unsigned int i; |
256 | unsigned int optsize = th->doff * 4 | |
257 | - sizeof(struct tcphdr); | |
258 | ||
259 | op = skb_header_pointer(skb, | |
260 | ptr + sizeof(struct tcphdr), | |
261 | optsize, _opt); | |
262 | if (op == NULL) { | |
263 | printk("OPT (TRUNCATED)"); | |
264 | return; | |
265 | } | |
266 | ||
267 | /* Max length: 127 "OPT (" 15*4*2chars ") " */ | |
268 | printk("OPT ("); | |
269 | for (i =0; i < optsize; i++) | |
270 | printk("%02X", op[i]); | |
271 | printk(") "); | |
272 | } | |
273 | break; | |
274 | } | |
ba4e58ec GR |
275 | case IPPROTO_UDP: |
276 | case IPPROTO_UDPLITE: { | |
a47362a2 JE |
277 | struct udphdr _udph; |
278 | const struct udphdr *uh; | |
1da177e4 | 279 | |
ba4e58ec GR |
280 | if (currenthdr == IPPROTO_UDP) |
281 | /* Max length: 10 "PROTO=UDP " */ | |
282 | printk("PROTO=UDP " ); | |
283 | else /* Max length: 14 "PROTO=UDPLITE " */ | |
284 | printk("PROTO=UDPLITE "); | |
1da177e4 LT |
285 | |
286 | if (fragment) | |
287 | break; | |
288 | ||
289 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
290 | uh = skb_header_pointer(skb, ptr, sizeof(_udph), &_udph); | |
291 | if (uh == NULL) { | |
292 | printk("INCOMPLETE [%u bytes] ", skb->len - ptr); | |
293 | return; | |
294 | } | |
295 | ||
296 | /* Max length: 20 "SPT=65535 DPT=65535 " */ | |
297 | printk("SPT=%u DPT=%u LEN=%u ", | |
298 | ntohs(uh->source), ntohs(uh->dest), | |
299 | ntohs(uh->len)); | |
300 | break; | |
301 | } | |
302 | case IPPROTO_ICMPV6: { | |
a47362a2 JE |
303 | struct icmp6hdr _icmp6h; |
304 | const struct icmp6hdr *ic; | |
1da177e4 LT |
305 | |
306 | /* Max length: 13 "PROTO=ICMPv6 " */ | |
307 | printk("PROTO=ICMPv6 "); | |
308 | ||
309 | if (fragment) | |
310 | break; | |
311 | ||
312 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
313 | ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h); | |
314 | if (ic == NULL) { | |
315 | printk("INCOMPLETE [%u bytes] ", skb->len - ptr); | |
316 | return; | |
317 | } | |
318 | ||
319 | /* Max length: 18 "TYPE=255 CODE=255 " */ | |
320 | printk("TYPE=%u CODE=%u ", ic->icmp6_type, ic->icmp6_code); | |
321 | ||
322 | switch (ic->icmp6_type) { | |
323 | case ICMPV6_ECHO_REQUEST: | |
324 | case ICMPV6_ECHO_REPLY: | |
325 | /* Max length: 19 "ID=65535 SEQ=65535 " */ | |
326 | printk("ID=%u SEQ=%u ", | |
327 | ntohs(ic->icmp6_identifier), | |
328 | ntohs(ic->icmp6_sequence)); | |
329 | break; | |
330 | case ICMPV6_MGM_QUERY: | |
331 | case ICMPV6_MGM_REPORT: | |
332 | case ICMPV6_MGM_REDUCTION: | |
333 | break; | |
334 | ||
335 | case ICMPV6_PARAMPROB: | |
336 | /* Max length: 17 "POINTER=ffffffff " */ | |
337 | printk("POINTER=%08x ", ntohl(ic->icmp6_pointer)); | |
338 | /* Fall through */ | |
339 | case ICMPV6_DEST_UNREACH: | |
340 | case ICMPV6_PKT_TOOBIG: | |
341 | case ICMPV6_TIME_EXCEED: | |
342 | /* Max length: 3+maxlen */ | |
343 | if (recurse) { | |
344 | printk("["); | |
345 | dump_packet(info, skb, ptr + sizeof(_icmp6h), | |
346 | 0); | |
347 | printk("] "); | |
348 | } | |
349 | ||
350 | /* Max length: 10 "MTU=65535 " */ | |
351 | if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) | |
352 | printk("MTU=%u ", ntohl(ic->icmp6_mtu)); | |
353 | } | |
354 | break; | |
355 | } | |
356 | /* Max length: 10 "PROTO=255 " */ | |
357 | default: | |
358 | printk("PROTO=%u ", currenthdr); | |
359 | } | |
360 | ||
361 | /* Max length: 15 "UID=4294967295 " */ | |
608c8e4f | 362 | if ((logflags & IP6T_LOG_UID) && recurse && skb->sk) { |
1da177e4 LT |
363 | read_lock_bh(&skb->sk->sk_callback_lock); |
364 | if (skb->sk->sk_socket && skb->sk->sk_socket->file) | |
17dfc93f MS |
365 | printk("UID=%u GID=%u", |
366 | skb->sk->sk_socket->file->f_uid, | |
367 | skb->sk->sk_socket->file->f_gid); | |
1da177e4 LT |
368 | read_unlock_bh(&skb->sk->sk_callback_lock); |
369 | } | |
370 | } | |
371 | ||
608c8e4f HW |
372 | static struct nf_loginfo default_loginfo = { |
373 | .type = NF_LOG_TYPE_LOG, | |
374 | .u = { | |
375 | .log = { | |
376 | .level = 0, | |
377 | .logflags = NF_LOG_MASK, | |
378 | }, | |
379 | }, | |
380 | }; | |
381 | ||
1da177e4 | 382 | static void |
608c8e4f HW |
383 | ip6t_log_packet(unsigned int pf, |
384 | unsigned int hooknum, | |
1da177e4 LT |
385 | const struct sk_buff *skb, |
386 | const struct net_device *in, | |
387 | const struct net_device *out, | |
608c8e4f | 388 | const struct nf_loginfo *loginfo, |
1da177e4 LT |
389 | const char *prefix) |
390 | { | |
608c8e4f HW |
391 | if (!loginfo) |
392 | loginfo = &default_loginfo; | |
393 | ||
1da177e4 | 394 | spin_lock_bh(&log_lock); |
1ab1457c | 395 | printk("<%d>%sIN=%s OUT=%s ", loginfo->u.log.level, |
608c8e4f | 396 | prefix, |
1da177e4 LT |
397 | in ? in->name : "", |
398 | out ? out->name : ""); | |
399 | if (in && !out) { | |
d3984a6b | 400 | unsigned int len; |
1da177e4 LT |
401 | /* MAC logging for input chain only. */ |
402 | printk("MAC="); | |
d3984a6b | 403 | if (skb->dev && (len = skb->dev->hard_header_len) && |
b0e380b1 | 404 | skb->mac_header != skb->network_header) { |
98e399f8 | 405 | const unsigned char *p = skb_mac_header(skb); |
047601bf PM |
406 | int i; |
407 | ||
408 | if (skb->dev->type == ARPHRD_SIT && | |
409 | (p -= ETH_HLEN) < skb->head) | |
410 | p = NULL; | |
411 | ||
d3984a6b PM |
412 | if (p != NULL) { |
413 | for (i = 0; i < len; i++) | |
414 | printk("%02x%s", p[i], | |
415 | i == len - 1 ? "" : ":"); | |
416 | } | |
047601bf PM |
417 | printk(" "); |
418 | ||
419 | if (skb->dev->type == ARPHRD_SIT) { | |
98e399f8 ACM |
420 | const struct iphdr *iph = |
421 | (struct iphdr *)skb_mac_header(skb); | |
047601bf PM |
422 | printk("TUNNEL=%u.%u.%u.%u->%u.%u.%u.%u ", |
423 | NIPQUAD(iph->saddr), | |
424 | NIPQUAD(iph->daddr)); | |
1da177e4 LT |
425 | } |
426 | } else | |
427 | printk(" "); | |
428 | } | |
429 | ||
0660e03f | 430 | dump_packet(loginfo, skb, skb_network_offset(skb), 1); |
1da177e4 LT |
431 | printk("\n"); |
432 | spin_unlock_bh(&log_lock); | |
433 | } | |
434 | ||
435 | static unsigned int | |
d3c5ee6d JE |
436 | log_tg6(struct sk_buff *skb, const struct net_device *in, |
437 | const struct net_device *out, unsigned int hooknum, | |
438 | const struct xt_target *target, const void *targinfo) | |
1da177e4 LT |
439 | { |
440 | const struct ip6t_log_info *loginfo = targinfo; | |
608c8e4f HW |
441 | struct nf_loginfo li; |
442 | ||
443 | li.type = NF_LOG_TYPE_LOG; | |
444 | li.u.log.level = loginfo->level; | |
445 | li.u.log.logflags = loginfo->logflags; | |
1da177e4 | 446 | |
3db05fea | 447 | ip6t_log_packet(PF_INET6, hooknum, skb, in, out, &li, loginfo->prefix); |
6709dbbb | 448 | return XT_CONTINUE; |
1da177e4 LT |
449 | } |
450 | ||
1da177e4 | 451 | |
d3c5ee6d JE |
452 | static bool |
453 | log_tg6_check(const char *tablename, const void *entry, | |
454 | const struct xt_target *target, void *targinfo, | |
455 | unsigned int hook_mask) | |
1da177e4 LT |
456 | { |
457 | const struct ip6t_log_info *loginfo = targinfo; | |
458 | ||
1da177e4 | 459 | if (loginfo->level >= 8) { |
0d53778e | 460 | pr_debug("LOG: level %u >= 8\n", loginfo->level); |
e1931b78 | 461 | return false; |
1da177e4 | 462 | } |
1da177e4 | 463 | if (loginfo->prefix[sizeof(loginfo->prefix)-1] != '\0') { |
0d53778e PM |
464 | pr_debug("LOG: prefix term %i\n", |
465 | loginfo->prefix[sizeof(loginfo->prefix)-1]); | |
e1931b78 | 466 | return false; |
1da177e4 | 467 | } |
e1931b78 | 468 | return true; |
1da177e4 LT |
469 | } |
470 | ||
d3c5ee6d | 471 | static struct xt_target log_tg6_reg __read_mostly = { |
1da177e4 | 472 | .name = "LOG", |
6709dbbb | 473 | .family = AF_INET6, |
d3c5ee6d | 474 | .target = log_tg6, |
7f939713 | 475 | .targetsize = sizeof(struct ip6t_log_info), |
d3c5ee6d | 476 | .checkentry = log_tg6_check, |
1da177e4 LT |
477 | .me = THIS_MODULE, |
478 | }; | |
479 | ||
608c8e4f HW |
480 | static struct nf_logger ip6t_logger = { |
481 | .name = "ip6t_LOG", | |
482 | .logfn = &ip6t_log_packet, | |
483 | .me = THIS_MODULE, | |
484 | }; | |
485 | ||
d3c5ee6d | 486 | static int __init log_tg6_init(void) |
1da177e4 | 487 | { |
e1fd0586 JE |
488 | int ret; |
489 | ||
d3c5ee6d | 490 | ret = xt_register_target(&log_tg6_reg); |
e1fd0586 JE |
491 | if (ret < 0) |
492 | return ret; | |
7e2acc7e PM |
493 | nf_log_register(PF_INET6, &ip6t_logger); |
494 | return 0; | |
1da177e4 LT |
495 | } |
496 | ||
d3c5ee6d | 497 | static void __exit log_tg6_exit(void) |
1da177e4 | 498 | { |
e92ad99c | 499 | nf_log_unregister(&ip6t_logger); |
d3c5ee6d | 500 | xt_unregister_target(&log_tg6_reg); |
1da177e4 LT |
501 | } |
502 | ||
d3c5ee6d JE |
503 | module_init(log_tg6_init); |
504 | module_exit(log_tg6_exit); |