Commit | Line | Data |
---|---|---|
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 | */ | |
8ac2bde2 | 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
83e96d44 PNA |
9 | |
10 | #include <linux/module.h> | |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/if_arp.h> | |
14 | #include <linux/ip.h> | |
15 | #include <net/ipv6.h> | |
16 | #include <net/icmp.h> | |
17 | #include <net/udp.h> | |
18 | #include <net/tcp.h> | |
19 | #include <net/route.h> | |
20 | ||
21 | #include <linux/netfilter.h> | |
22 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
23 | #include <linux/netfilter/xt_LOG.h> | |
24 | #include <net/netfilter/nf_log.h> | |
25 | ||
26 | static struct nf_loginfo default_loginfo = { | |
27 | .type = NF_LOG_TYPE_LOG, | |
28 | .u = { | |
29 | .log = { | |
30 | .level = 5, | |
31 | .logflags = NF_LOG_MASK, | |
32 | }, | |
33 | }, | |
34 | }; | |
35 | ||
36 | /* One level of recursion won't kill us */ | |
37 | static void dump_ipv6_packet(struct nf_log_buf *m, | |
38 | const struct nf_loginfo *info, | |
39 | const struct sk_buff *skb, unsigned int ip6hoff, | |
40 | int recurse) | |
41 | { | |
42 | u_int8_t currenthdr; | |
43 | int fragment; | |
44 | struct ipv6hdr _ip6h; | |
45 | const struct ipv6hdr *ih; | |
46 | unsigned int ptr; | |
47 | unsigned int hdrlen = 0; | |
48 | unsigned int logflags; | |
49 | ||
50 | if (info->type == NF_LOG_TYPE_LOG) | |
51 | logflags = info->u.log.logflags; | |
52 | else | |
53 | logflags = NF_LOG_MASK; | |
54 | ||
55 | ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h); | |
56 | if (ih == NULL) { | |
57 | nf_log_buf_add(m, "TRUNCATED"); | |
58 | return; | |
59 | } | |
60 | ||
61 | /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */ | |
62 | nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr); | |
63 | ||
64 | /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */ | |
65 | nf_log_buf_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ", | |
66 | ntohs(ih->payload_len) + sizeof(struct ipv6hdr), | |
67 | (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20, | |
68 | ih->hop_limit, | |
69 | (ntohl(*(__be32 *)ih) & 0x000fffff)); | |
70 | ||
71 | fragment = 0; | |
72 | ptr = ip6hoff + sizeof(struct ipv6hdr); | |
73 | currenthdr = ih->nexthdr; | |
74 | while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) { | |
75 | struct ipv6_opt_hdr _hdr; | |
76 | const struct ipv6_opt_hdr *hp; | |
77 | ||
78 | hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr); | |
79 | if (hp == NULL) { | |
80 | nf_log_buf_add(m, "TRUNCATED"); | |
81 | return; | |
82 | } | |
83 | ||
84 | /* Max length: 48 "OPT (...) " */ | |
85 | if (logflags & XT_LOG_IPOPT) | |
86 | nf_log_buf_add(m, "OPT ( "); | |
87 | ||
88 | switch (currenthdr) { | |
89 | case IPPROTO_FRAGMENT: { | |
90 | struct frag_hdr _fhdr; | |
91 | const struct frag_hdr *fh; | |
92 | ||
93 | nf_log_buf_add(m, "FRAG:"); | |
94 | fh = skb_header_pointer(skb, ptr, sizeof(_fhdr), | |
95 | &_fhdr); | |
96 | if (fh == NULL) { | |
97 | nf_log_buf_add(m, "TRUNCATED "); | |
98 | return; | |
99 | } | |
100 | ||
101 | /* Max length: 6 "65535 " */ | |
102 | nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8); | |
103 | ||
104 | /* Max length: 11 "INCOMPLETE " */ | |
105 | if (fh->frag_off & htons(0x0001)) | |
106 | nf_log_buf_add(m, "INCOMPLETE "); | |
107 | ||
108 | nf_log_buf_add(m, "ID:%08x ", | |
109 | 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) { | |
122 | if (logflags & XT_LOG_IPOPT) | |
123 | nf_log_buf_add(m, ")"); | |
124 | return; | |
125 | } | |
126 | hdrlen = ipv6_optlen(hp); | |
127 | break; | |
128 | /* Max Length */ | |
129 | case IPPROTO_AH: | |
130 | if (logflags & XT_LOG_IPOPT) { | |
131 | struct ip_auth_hdr _ahdr; | |
132 | const struct ip_auth_hdr *ah; | |
133 | ||
134 | /* Max length: 3 "AH " */ | |
135 | nf_log_buf_add(m, "AH "); | |
136 | ||
137 | if (fragment) { | |
138 | nf_log_buf_add(m, ")"); | |
139 | return; | |
140 | } | |
141 | ||
142 | ah = skb_header_pointer(skb, ptr, sizeof(_ahdr), | |
143 | &_ahdr); | |
144 | if (ah == NULL) { | |
145 | /* | |
146 | * Max length: 26 "INCOMPLETE [65535 | |
147 | * bytes] )" | |
148 | */ | |
149 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] )", | |
150 | skb->len - ptr); | |
151 | return; | |
152 | } | |
153 | ||
154 | /* Length: 15 "SPI=0xF1234567 */ | |
155 | nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi)); | |
156 | ||
157 | } | |
158 | ||
159 | hdrlen = (hp->hdrlen+2)<<2; | |
160 | break; | |
161 | case IPPROTO_ESP: | |
162 | if (logflags & XT_LOG_IPOPT) { | |
163 | struct ip_esp_hdr _esph; | |
164 | const struct ip_esp_hdr *eh; | |
165 | ||
166 | /* Max length: 4 "ESP " */ | |
167 | nf_log_buf_add(m, "ESP "); | |
168 | ||
169 | if (fragment) { | |
170 | nf_log_buf_add(m, ")"); | |
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 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] )", | |
181 | skb->len - ptr); | |
182 | return; | |
183 | } | |
184 | ||
185 | /* Length: 16 "SPI=0xF1234567 )" */ | |
186 | nf_log_buf_add(m, "SPI=0x%x )", | |
187 | ntohl(eh->spi)); | |
188 | } | |
189 | return; | |
190 | default: | |
191 | /* Max length: 20 "Unknown Ext Hdr 255" */ | |
192 | nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr); | |
193 | return; | |
194 | } | |
195 | if (logflags & XT_LOG_IPOPT) | |
196 | nf_log_buf_add(m, ") "); | |
197 | ||
198 | currenthdr = hp->nexthdr; | |
199 | ptr += hdrlen; | |
200 | } | |
201 | ||
202 | switch (currenthdr) { | |
203 | case IPPROTO_TCP: | |
204 | if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment, | |
205 | ptr, logflags)) | |
206 | return; | |
207 | break; | |
208 | case IPPROTO_UDP: | |
209 | case IPPROTO_UDPLITE: | |
210 | if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr)) | |
211 | return; | |
212 | break; | |
213 | case IPPROTO_ICMPV6: { | |
214 | struct icmp6hdr _icmp6h; | |
215 | const struct icmp6hdr *ic; | |
216 | ||
217 | /* Max length: 13 "PROTO=ICMPv6 " */ | |
218 | nf_log_buf_add(m, "PROTO=ICMPv6 "); | |
219 | ||
220 | if (fragment) | |
221 | break; | |
222 | ||
223 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
224 | ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h); | |
225 | if (ic == NULL) { | |
226 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", | |
227 | skb->len - ptr); | |
228 | return; | |
229 | } | |
230 | ||
231 | /* Max length: 18 "TYPE=255 CODE=255 " */ | |
232 | nf_log_buf_add(m, "TYPE=%u CODE=%u ", | |
233 | ic->icmp6_type, ic->icmp6_code); | |
234 | ||
235 | switch (ic->icmp6_type) { | |
236 | case ICMPV6_ECHO_REQUEST: | |
237 | case ICMPV6_ECHO_REPLY: | |
238 | /* Max length: 19 "ID=65535 SEQ=65535 " */ | |
239 | nf_log_buf_add(m, "ID=%u SEQ=%u ", | |
240 | ntohs(ic->icmp6_identifier), | |
241 | ntohs(ic->icmp6_sequence)); | |
242 | break; | |
243 | case ICMPV6_MGM_QUERY: | |
244 | case ICMPV6_MGM_REPORT: | |
245 | case ICMPV6_MGM_REDUCTION: | |
246 | break; | |
247 | ||
248 | case ICMPV6_PARAMPROB: | |
249 | /* Max length: 17 "POINTER=ffffffff " */ | |
250 | nf_log_buf_add(m, "POINTER=%08x ", | |
251 | ntohl(ic->icmp6_pointer)); | |
252 | /* Fall through */ | |
253 | case ICMPV6_DEST_UNREACH: | |
254 | case ICMPV6_PKT_TOOBIG: | |
255 | case ICMPV6_TIME_EXCEED: | |
256 | /* Max length: 3+maxlen */ | |
257 | if (recurse) { | |
258 | nf_log_buf_add(m, "["); | |
259 | dump_ipv6_packet(m, info, skb, | |
260 | ptr + sizeof(_icmp6h), 0); | |
261 | nf_log_buf_add(m, "] "); | |
262 | } | |
263 | ||
264 | /* Max length: 10 "MTU=65535 " */ | |
265 | if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) { | |
266 | nf_log_buf_add(m, "MTU=%u ", | |
267 | ntohl(ic->icmp6_mtu)); | |
268 | } | |
269 | } | |
270 | break; | |
271 | } | |
272 | /* Max length: 10 "PROTO=255 " */ | |
273 | default: | |
274 | nf_log_buf_add(m, "PROTO=%u ", currenthdr); | |
275 | } | |
276 | ||
277 | /* Max length: 15 "UID=4294967295 " */ | |
278 | if ((logflags & XT_LOG_UID) && recurse) | |
279 | nf_log_dump_sk_uid_gid(m, skb->sk); | |
280 | ||
281 | /* Max length: 16 "MARK=0xFFFFFFFF " */ | |
282 | if (recurse && skb->mark) | |
283 | nf_log_buf_add(m, "MARK=0x%x ", skb->mark); | |
284 | } | |
285 | ||
286 | static void dump_ipv6_mac_header(struct nf_log_buf *m, | |
287 | const struct nf_loginfo *info, | |
288 | const struct sk_buff *skb) | |
289 | { | |
290 | struct net_device *dev = skb->dev; | |
291 | unsigned int logflags = 0; | |
292 | ||
293 | if (info->type == NF_LOG_TYPE_LOG) | |
294 | logflags = info->u.log.logflags; | |
295 | ||
296 | if (!(logflags & XT_LOG_MACDECODE)) | |
297 | goto fallback; | |
298 | ||
299 | switch (dev->type) { | |
300 | case ARPHRD_ETHER: | |
301 | nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ", | |
302 | eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
303 | ntohs(eth_hdr(skb)->h_proto)); | |
304 | return; | |
305 | default: | |
306 | break; | |
307 | } | |
308 | ||
309 | fallback: | |
310 | nf_log_buf_add(m, "MAC="); | |
311 | if (dev->hard_header_len && | |
312 | skb->mac_header != skb->network_header) { | |
313 | const unsigned char *p = skb_mac_header(skb); | |
314 | unsigned int len = dev->hard_header_len; | |
315 | unsigned int i; | |
316 | ||
317 | if (dev->type == ARPHRD_SIT) { | |
318 | p -= ETH_HLEN; | |
319 | ||
320 | if (p < skb->head) | |
321 | p = NULL; | |
322 | } | |
323 | ||
324 | if (p != NULL) { | |
325 | nf_log_buf_add(m, "%02x", *p++); | |
326 | for (i = 1; i < len; i++) | |
327 | nf_log_buf_add(m, ":%02x", *p++); | |
328 | } | |
329 | nf_log_buf_add(m, " "); | |
330 | ||
331 | if (dev->type == ARPHRD_SIT) { | |
332 | const struct iphdr *iph = | |
333 | (struct iphdr *)skb_mac_header(skb); | |
334 | nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr, | |
335 | &iph->daddr); | |
336 | } | |
337 | } else { | |
338 | nf_log_buf_add(m, " "); | |
339 | } | |
340 | } | |
341 | ||
fab4085f PNA |
342 | static void nf_log_ip6_packet(struct net *net, u_int8_t pf, |
343 | unsigned int hooknum, const struct sk_buff *skb, | |
344 | const struct net_device *in, | |
345 | const struct net_device *out, | |
346 | const struct nf_loginfo *loginfo, | |
347 | const char *prefix) | |
83e96d44 PNA |
348 | { |
349 | struct nf_log_buf *m; | |
350 | ||
351 | /* FIXME: Disabled from containers until syslog ns is supported */ | |
352 | if (!net_eq(net, &init_net)) | |
353 | return; | |
354 | ||
355 | m = nf_log_buf_open(); | |
356 | ||
357 | if (!loginfo) | |
358 | loginfo = &default_loginfo; | |
359 | ||
360 | nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, | |
361 | loginfo, prefix); | |
362 | ||
363 | if (in != NULL) | |
364 | dump_ipv6_mac_header(m, loginfo, skb); | |
365 | ||
366 | dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1); | |
367 | ||
368 | nf_log_buf_close(m); | |
369 | } | |
83e96d44 PNA |
370 | |
371 | static struct nf_logger nf_ip6_logger __read_mostly = { | |
372 | .name = "nf_log_ipv6", | |
373 | .type = NF_LOG_TYPE_LOG, | |
374 | .logfn = nf_log_ip6_packet, | |
375 | .me = THIS_MODULE, | |
376 | }; | |
377 | ||
378 | static int __net_init nf_log_ipv6_net_init(struct net *net) | |
379 | { | |
380 | nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger); | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static void __net_exit nf_log_ipv6_net_exit(struct net *net) | |
385 | { | |
386 | nf_log_unset(net, &nf_ip6_logger); | |
387 | } | |
388 | ||
389 | static struct pernet_operations nf_log_ipv6_net_ops = { | |
390 | .init = nf_log_ipv6_net_init, | |
391 | .exit = nf_log_ipv6_net_exit, | |
392 | }; | |
393 | ||
394 | static int __init nf_log_ipv6_init(void) | |
395 | { | |
396 | int ret; | |
397 | ||
398 | ret = register_pernet_subsys(&nf_log_ipv6_net_ops); | |
399 | if (ret < 0) | |
400 | return ret; | |
401 | ||
8ac2bde2 ML |
402 | ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger); |
403 | if (ret < 0) { | |
404 | pr_err("failed to register logger\n"); | |
405 | goto err1; | |
406 | } | |
407 | ||
83e96d44 | 408 | return 0; |
8ac2bde2 ML |
409 | |
410 | err1: | |
411 | unregister_pernet_subsys(&nf_log_ipv6_net_ops); | |
412 | return ret; | |
83e96d44 PNA |
413 | } |
414 | ||
415 | static void __exit nf_log_ipv6_exit(void) | |
416 | { | |
417 | unregister_pernet_subsys(&nf_log_ipv6_net_ops); | |
418 | nf_log_unregister(&nf_ip6_logger); | |
419 | } | |
420 | ||
421 | module_init(nf_log_ipv6_init); | |
422 | module_exit(nf_log_ipv6_exit); | |
423 | ||
424 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
4338c572 | 425 | MODULE_DESCRIPTION("Netfilter IPv6 packet logging"); |
83e96d44 | 426 | MODULE_LICENSE("GPL"); |
fab4085f | 427 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 0); |