Commit | Line | Data |
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83e96d44 PNA |
1 | /* (C) 1999-2001 Paul `Rusty' Russell |
2 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/spinlock.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/if_arp.h> | |
13 | #include <linux/ip.h> | |
14 | #include <net/ipv6.h> | |
15 | #include <net/icmp.h> | |
16 | #include <net/udp.h> | |
17 | #include <net/tcp.h> | |
18 | #include <net/route.h> | |
19 | ||
20 | #include <linux/netfilter.h> | |
21 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
22 | #include <linux/netfilter/xt_LOG.h> | |
23 | #include <net/netfilter/nf_log.h> | |
24 | ||
25 | static struct nf_loginfo default_loginfo = { | |
26 | .type = NF_LOG_TYPE_LOG, | |
27 | .u = { | |
28 | .log = { | |
29 | .level = 5, | |
30 | .logflags = NF_LOG_MASK, | |
31 | }, | |
32 | }, | |
33 | }; | |
34 | ||
35 | /* One level of recursion won't kill us */ | |
36 | static void dump_ipv6_packet(struct nf_log_buf *m, | |
37 | const struct nf_loginfo *info, | |
38 | const struct sk_buff *skb, unsigned int ip6hoff, | |
39 | int recurse) | |
40 | { | |
41 | u_int8_t currenthdr; | |
42 | int fragment; | |
43 | struct ipv6hdr _ip6h; | |
44 | const struct ipv6hdr *ih; | |
45 | unsigned int ptr; | |
46 | unsigned int hdrlen = 0; | |
47 | unsigned int logflags; | |
48 | ||
49 | if (info->type == NF_LOG_TYPE_LOG) | |
50 | logflags = info->u.log.logflags; | |
51 | else | |
52 | logflags = NF_LOG_MASK; | |
53 | ||
54 | ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h); | |
55 | if (ih == NULL) { | |
56 | nf_log_buf_add(m, "TRUNCATED"); | |
57 | return; | |
58 | } | |
59 | ||
60 | /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */ | |
61 | nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr); | |
62 | ||
63 | /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */ | |
64 | nf_log_buf_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ", | |
65 | ntohs(ih->payload_len) + sizeof(struct ipv6hdr), | |
66 | (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20, | |
67 | ih->hop_limit, | |
68 | (ntohl(*(__be32 *)ih) & 0x000fffff)); | |
69 | ||
70 | fragment = 0; | |
71 | ptr = ip6hoff + sizeof(struct ipv6hdr); | |
72 | currenthdr = ih->nexthdr; | |
73 | while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) { | |
74 | struct ipv6_opt_hdr _hdr; | |
75 | const struct ipv6_opt_hdr *hp; | |
76 | ||
77 | hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr); | |
78 | if (hp == NULL) { | |
79 | nf_log_buf_add(m, "TRUNCATED"); | |
80 | return; | |
81 | } | |
82 | ||
83 | /* Max length: 48 "OPT (...) " */ | |
84 | if (logflags & XT_LOG_IPOPT) | |
85 | nf_log_buf_add(m, "OPT ( "); | |
86 | ||
87 | switch (currenthdr) { | |
88 | case IPPROTO_FRAGMENT: { | |
89 | struct frag_hdr _fhdr; | |
90 | const struct frag_hdr *fh; | |
91 | ||
92 | nf_log_buf_add(m, "FRAG:"); | |
93 | fh = skb_header_pointer(skb, ptr, sizeof(_fhdr), | |
94 | &_fhdr); | |
95 | if (fh == NULL) { | |
96 | nf_log_buf_add(m, "TRUNCATED "); | |
97 | return; | |
98 | } | |
99 | ||
100 | /* Max length: 6 "65535 " */ | |
101 | nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8); | |
102 | ||
103 | /* Max length: 11 "INCOMPLETE " */ | |
104 | if (fh->frag_off & htons(0x0001)) | |
105 | nf_log_buf_add(m, "INCOMPLETE "); | |
106 | ||
107 | nf_log_buf_add(m, "ID:%08x ", | |
108 | ntohl(fh->identification)); | |
109 | ||
110 | if (ntohs(fh->frag_off) & 0xFFF8) | |
111 | fragment = 1; | |
112 | ||
113 | hdrlen = 8; | |
114 | ||
115 | break; | |
116 | } | |
117 | case IPPROTO_DSTOPTS: | |
118 | case IPPROTO_ROUTING: | |
119 | case IPPROTO_HOPOPTS: | |
120 | if (fragment) { | |
121 | if (logflags & XT_LOG_IPOPT) | |
122 | nf_log_buf_add(m, ")"); | |
123 | return; | |
124 | } | |
125 | hdrlen = ipv6_optlen(hp); | |
126 | break; | |
127 | /* Max Length */ | |
128 | case IPPROTO_AH: | |
129 | if (logflags & XT_LOG_IPOPT) { | |
130 | struct ip_auth_hdr _ahdr; | |
131 | const struct ip_auth_hdr *ah; | |
132 | ||
133 | /* Max length: 3 "AH " */ | |
134 | nf_log_buf_add(m, "AH "); | |
135 | ||
136 | if (fragment) { | |
137 | nf_log_buf_add(m, ")"); | |
138 | return; | |
139 | } | |
140 | ||
141 | ah = skb_header_pointer(skb, ptr, sizeof(_ahdr), | |
142 | &_ahdr); | |
143 | if (ah == NULL) { | |
144 | /* | |
145 | * Max length: 26 "INCOMPLETE [65535 | |
146 | * bytes] )" | |
147 | */ | |
148 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] )", | |
149 | skb->len - ptr); | |
150 | return; | |
151 | } | |
152 | ||
153 | /* Length: 15 "SPI=0xF1234567 */ | |
154 | nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi)); | |
155 | ||
156 | } | |
157 | ||
158 | hdrlen = (hp->hdrlen+2)<<2; | |
159 | break; | |
160 | case IPPROTO_ESP: | |
161 | if (logflags & XT_LOG_IPOPT) { | |
162 | struct ip_esp_hdr _esph; | |
163 | const struct ip_esp_hdr *eh; | |
164 | ||
165 | /* Max length: 4 "ESP " */ | |
166 | nf_log_buf_add(m, "ESP "); | |
167 | ||
168 | if (fragment) { | |
169 | nf_log_buf_add(m, ")"); | |
170 | return; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Max length: 26 "INCOMPLETE [65535 bytes] )" | |
175 | */ | |
176 | eh = skb_header_pointer(skb, ptr, sizeof(_esph), | |
177 | &_esph); | |
178 | if (eh == NULL) { | |
179 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] )", | |
180 | skb->len - ptr); | |
181 | return; | |
182 | } | |
183 | ||
184 | /* Length: 16 "SPI=0xF1234567 )" */ | |
185 | nf_log_buf_add(m, "SPI=0x%x )", | |
186 | ntohl(eh->spi)); | |
187 | } | |
188 | return; | |
189 | default: | |
190 | /* Max length: 20 "Unknown Ext Hdr 255" */ | |
191 | nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr); | |
192 | return; | |
193 | } | |
194 | if (logflags & XT_LOG_IPOPT) | |
195 | nf_log_buf_add(m, ") "); | |
196 | ||
197 | currenthdr = hp->nexthdr; | |
198 | ptr += hdrlen; | |
199 | } | |
200 | ||
201 | switch (currenthdr) { | |
202 | case IPPROTO_TCP: | |
203 | if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment, | |
204 | ptr, logflags)) | |
205 | return; | |
206 | break; | |
207 | case IPPROTO_UDP: | |
208 | case IPPROTO_UDPLITE: | |
209 | if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr)) | |
210 | return; | |
211 | break; | |
212 | case IPPROTO_ICMPV6: { | |
213 | struct icmp6hdr _icmp6h; | |
214 | const struct icmp6hdr *ic; | |
215 | ||
216 | /* Max length: 13 "PROTO=ICMPv6 " */ | |
217 | nf_log_buf_add(m, "PROTO=ICMPv6 "); | |
218 | ||
219 | if (fragment) | |
220 | break; | |
221 | ||
222 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
223 | ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h); | |
224 | if (ic == NULL) { | |
225 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", | |
226 | skb->len - ptr); | |
227 | return; | |
228 | } | |
229 | ||
230 | /* Max length: 18 "TYPE=255 CODE=255 " */ | |
231 | nf_log_buf_add(m, "TYPE=%u CODE=%u ", | |
232 | ic->icmp6_type, ic->icmp6_code); | |
233 | ||
234 | switch (ic->icmp6_type) { | |
235 | case ICMPV6_ECHO_REQUEST: | |
236 | case ICMPV6_ECHO_REPLY: | |
237 | /* Max length: 19 "ID=65535 SEQ=65535 " */ | |
238 | nf_log_buf_add(m, "ID=%u SEQ=%u ", | |
239 | ntohs(ic->icmp6_identifier), | |
240 | ntohs(ic->icmp6_sequence)); | |
241 | break; | |
242 | case ICMPV6_MGM_QUERY: | |
243 | case ICMPV6_MGM_REPORT: | |
244 | case ICMPV6_MGM_REDUCTION: | |
245 | break; | |
246 | ||
247 | case ICMPV6_PARAMPROB: | |
248 | /* Max length: 17 "POINTER=ffffffff " */ | |
249 | nf_log_buf_add(m, "POINTER=%08x ", | |
250 | ntohl(ic->icmp6_pointer)); | |
251 | /* Fall through */ | |
252 | case ICMPV6_DEST_UNREACH: | |
253 | case ICMPV6_PKT_TOOBIG: | |
254 | case ICMPV6_TIME_EXCEED: | |
255 | /* Max length: 3+maxlen */ | |
256 | if (recurse) { | |
257 | nf_log_buf_add(m, "["); | |
258 | dump_ipv6_packet(m, info, skb, | |
259 | ptr + sizeof(_icmp6h), 0); | |
260 | nf_log_buf_add(m, "] "); | |
261 | } | |
262 | ||
263 | /* Max length: 10 "MTU=65535 " */ | |
264 | if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) { | |
265 | nf_log_buf_add(m, "MTU=%u ", | |
266 | ntohl(ic->icmp6_mtu)); | |
267 | } | |
268 | } | |
269 | break; | |
270 | } | |
271 | /* Max length: 10 "PROTO=255 " */ | |
272 | default: | |
273 | nf_log_buf_add(m, "PROTO=%u ", currenthdr); | |
274 | } | |
275 | ||
276 | /* Max length: 15 "UID=4294967295 " */ | |
277 | if ((logflags & XT_LOG_UID) && recurse) | |
278 | nf_log_dump_sk_uid_gid(m, skb->sk); | |
279 | ||
280 | /* Max length: 16 "MARK=0xFFFFFFFF " */ | |
281 | if (recurse && skb->mark) | |
282 | nf_log_buf_add(m, "MARK=0x%x ", skb->mark); | |
283 | } | |
284 | ||
285 | static void dump_ipv6_mac_header(struct nf_log_buf *m, | |
286 | const struct nf_loginfo *info, | |
287 | const struct sk_buff *skb) | |
288 | { | |
289 | struct net_device *dev = skb->dev; | |
290 | unsigned int logflags = 0; | |
291 | ||
292 | if (info->type == NF_LOG_TYPE_LOG) | |
293 | logflags = info->u.log.logflags; | |
294 | ||
295 | if (!(logflags & XT_LOG_MACDECODE)) | |
296 | goto fallback; | |
297 | ||
298 | switch (dev->type) { | |
299 | case ARPHRD_ETHER: | |
300 | nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ", | |
301 | eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
302 | ntohs(eth_hdr(skb)->h_proto)); | |
303 | return; | |
304 | default: | |
305 | break; | |
306 | } | |
307 | ||
308 | fallback: | |
309 | nf_log_buf_add(m, "MAC="); | |
310 | if (dev->hard_header_len && | |
311 | skb->mac_header != skb->network_header) { | |
312 | const unsigned char *p = skb_mac_header(skb); | |
313 | unsigned int len = dev->hard_header_len; | |
314 | unsigned int i; | |
315 | ||
316 | if (dev->type == ARPHRD_SIT) { | |
317 | p -= ETH_HLEN; | |
318 | ||
319 | if (p < skb->head) | |
320 | p = NULL; | |
321 | } | |
322 | ||
323 | if (p != NULL) { | |
324 | nf_log_buf_add(m, "%02x", *p++); | |
325 | for (i = 1; i < len; i++) | |
326 | nf_log_buf_add(m, ":%02x", *p++); | |
327 | } | |
328 | nf_log_buf_add(m, " "); | |
329 | ||
330 | if (dev->type == ARPHRD_SIT) { | |
331 | const struct iphdr *iph = | |
332 | (struct iphdr *)skb_mac_header(skb); | |
333 | nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr, | |
334 | &iph->daddr); | |
335 | } | |
336 | } else { | |
337 | nf_log_buf_add(m, " "); | |
338 | } | |
339 | } | |
340 | ||
fab4085f PNA |
341 | static void nf_log_ip6_packet(struct net *net, u_int8_t pf, |
342 | unsigned int hooknum, const struct sk_buff *skb, | |
343 | const struct net_device *in, | |
344 | const struct net_device *out, | |
345 | const struct nf_loginfo *loginfo, | |
346 | const char *prefix) | |
83e96d44 PNA |
347 | { |
348 | struct nf_log_buf *m; | |
349 | ||
350 | /* FIXME: Disabled from containers until syslog ns is supported */ | |
351 | if (!net_eq(net, &init_net)) | |
352 | return; | |
353 | ||
354 | m = nf_log_buf_open(); | |
355 | ||
356 | if (!loginfo) | |
357 | loginfo = &default_loginfo; | |
358 | ||
359 | nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, | |
360 | loginfo, prefix); | |
361 | ||
362 | if (in != NULL) | |
363 | dump_ipv6_mac_header(m, loginfo, skb); | |
364 | ||
365 | dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1); | |
366 | ||
367 | nf_log_buf_close(m); | |
368 | } | |
83e96d44 PNA |
369 | |
370 | static struct nf_logger nf_ip6_logger __read_mostly = { | |
371 | .name = "nf_log_ipv6", | |
372 | .type = NF_LOG_TYPE_LOG, | |
373 | .logfn = nf_log_ip6_packet, | |
374 | .me = THIS_MODULE, | |
375 | }; | |
376 | ||
377 | static int __net_init nf_log_ipv6_net_init(struct net *net) | |
378 | { | |
379 | nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static void __net_exit nf_log_ipv6_net_exit(struct net *net) | |
384 | { | |
385 | nf_log_unset(net, &nf_ip6_logger); | |
386 | } | |
387 | ||
388 | static struct pernet_operations nf_log_ipv6_net_ops = { | |
389 | .init = nf_log_ipv6_net_init, | |
390 | .exit = nf_log_ipv6_net_exit, | |
391 | }; | |
392 | ||
393 | static int __init nf_log_ipv6_init(void) | |
394 | { | |
395 | int ret; | |
396 | ||
397 | ret = register_pernet_subsys(&nf_log_ipv6_net_ops); | |
398 | if (ret < 0) | |
399 | return ret; | |
400 | ||
401 | nf_log_register(NFPROTO_IPV6, &nf_ip6_logger); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static void __exit nf_log_ipv6_exit(void) | |
406 | { | |
407 | unregister_pernet_subsys(&nf_log_ipv6_net_ops); | |
408 | nf_log_unregister(&nf_ip6_logger); | |
409 | } | |
410 | ||
411 | module_init(nf_log_ipv6_init); | |
412 | module_exit(nf_log_ipv6_exit); | |
413 | ||
414 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
415 | MODULE_DESCRIPTION("Netfilter IPv4 packet logging"); | |
416 | MODULE_LICENSE("GPL"); | |
fab4085f | 417 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 0); |