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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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/if_arp.h> | |
16 | #include <linux/ip.h> | |
17 | #include <net/ipv6.h> | |
18 | #include <net/icmp.h> | |
19 | #include <net/udp.h> | |
20 | #include <net/tcp.h> | |
21 | #include <net/route.h> | |
22 | ||
23 | #include <linux/netfilter.h> | |
24 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
25 | #include <linux/netfilter/xt_LOG.h> | |
26 | #include <net/netfilter/nf_log.h> | |
27 | ||
28 | static struct nf_loginfo default_loginfo = { | |
29 | .type = NF_LOG_TYPE_LOG, | |
30 | .u = { | |
31 | .log = { | |
32 | .level = LOGLEVEL_NOTICE, | |
33 | .logflags = NF_LOG_DEFAULT_MASK, | |
34 | }, | |
35 | }, | |
36 | }; | |
37 | ||
38 | /* One level of recursion won't kill us */ | |
39 | static void dump_ipv6_packet(struct nf_log_buf *m, | |
40 | const struct nf_loginfo *info, | |
41 | const struct sk_buff *skb, unsigned int ip6hoff, | |
42 | int recurse) | |
43 | { | |
44 | u_int8_t currenthdr; | |
45 | int fragment; | |
46 | struct ipv6hdr _ip6h; | |
47 | const struct ipv6hdr *ih; | |
48 | unsigned int ptr; | |
49 | unsigned int hdrlen = 0; | |
50 | unsigned int logflags; | |
51 | ||
52 | if (info->type == NF_LOG_TYPE_LOG) | |
53 | logflags = info->u.log.logflags; | |
54 | else | |
55 | logflags = NF_LOG_DEFAULT_MASK; | |
56 | ||
57 | ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h); | |
58 | if (ih == NULL) { | |
59 | nf_log_buf_add(m, "TRUNCATED"); | |
60 | return; | |
61 | } | |
62 | ||
63 | /* Max length: 88 "SRC=0000.0000.0000.0000.0000.0000.0000.0000 DST=0000.0000.0000.0000.0000.0000.0000.0000 " */ | |
64 | nf_log_buf_add(m, "SRC=%pI6 DST=%pI6 ", &ih->saddr, &ih->daddr); | |
65 | ||
66 | /* Max length: 44 "LEN=65535 TC=255 HOPLIMIT=255 FLOWLBL=FFFFF " */ | |
67 | nf_log_buf_add(m, "LEN=%Zu TC=%u HOPLIMIT=%u FLOWLBL=%u ", | |
68 | ntohs(ih->payload_len) + sizeof(struct ipv6hdr), | |
69 | (ntohl(*(__be32 *)ih) & 0x0ff00000) >> 20, | |
70 | ih->hop_limit, | |
71 | (ntohl(*(__be32 *)ih) & 0x000fffff)); | |
72 | ||
73 | fragment = 0; | |
74 | ptr = ip6hoff + sizeof(struct ipv6hdr); | |
75 | currenthdr = ih->nexthdr; | |
76 | while (currenthdr != NEXTHDR_NONE && ip6t_ext_hdr(currenthdr)) { | |
77 | struct ipv6_opt_hdr _hdr; | |
78 | const struct ipv6_opt_hdr *hp; | |
79 | ||
80 | hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr); | |
81 | if (hp == NULL) { | |
82 | nf_log_buf_add(m, "TRUNCATED"); | |
83 | return; | |
84 | } | |
85 | ||
86 | /* Max length: 48 "OPT (...) " */ | |
87 | if (logflags & NF_LOG_IPOPT) | |
88 | nf_log_buf_add(m, "OPT ( "); | |
89 | ||
90 | switch (currenthdr) { | |
91 | case IPPROTO_FRAGMENT: { | |
92 | struct frag_hdr _fhdr; | |
93 | const struct frag_hdr *fh; | |
94 | ||
95 | nf_log_buf_add(m, "FRAG:"); | |
96 | fh = skb_header_pointer(skb, ptr, sizeof(_fhdr), | |
97 | &_fhdr); | |
98 | if (fh == NULL) { | |
99 | nf_log_buf_add(m, "TRUNCATED "); | |
100 | return; | |
101 | } | |
102 | ||
103 | /* Max length: 6 "65535 " */ | |
104 | nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8); | |
105 | ||
106 | /* Max length: 11 "INCOMPLETE " */ | |
107 | if (fh->frag_off & htons(0x0001)) | |
108 | nf_log_buf_add(m, "INCOMPLETE "); | |
109 | ||
110 | nf_log_buf_add(m, "ID:%08x ", | |
111 | ntohl(fh->identification)); | |
112 | ||
113 | if (ntohs(fh->frag_off) & 0xFFF8) | |
114 | fragment = 1; | |
115 | ||
116 | hdrlen = 8; | |
117 | ||
118 | break; | |
119 | } | |
120 | case IPPROTO_DSTOPTS: | |
121 | case IPPROTO_ROUTING: | |
122 | case IPPROTO_HOPOPTS: | |
123 | if (fragment) { | |
124 | if (logflags & NF_LOG_IPOPT) | |
125 | nf_log_buf_add(m, ")"); | |
126 | return; | |
127 | } | |
128 | hdrlen = ipv6_optlen(hp); | |
129 | break; | |
130 | /* Max Length */ | |
131 | case IPPROTO_AH: | |
132 | if (logflags & NF_LOG_IPOPT) { | |
133 | struct ip_auth_hdr _ahdr; | |
134 | const struct ip_auth_hdr *ah; | |
135 | ||
136 | /* Max length: 3 "AH " */ | |
137 | nf_log_buf_add(m, "AH "); | |
138 | ||
139 | if (fragment) { | |
140 | nf_log_buf_add(m, ")"); | |
141 | return; | |
142 | } | |
143 | ||
144 | ah = skb_header_pointer(skb, ptr, sizeof(_ahdr), | |
145 | &_ahdr); | |
146 | if (ah == NULL) { | |
147 | /* | |
148 | * Max length: 26 "INCOMPLETE [65535 | |
149 | * bytes] )" | |
150 | */ | |
151 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] )", | |
152 | skb->len - ptr); | |
153 | return; | |
154 | } | |
155 | ||
156 | /* Length: 15 "SPI=0xF1234567 */ | |
157 | nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi)); | |
158 | ||
159 | } | |
160 | ||
161 | hdrlen = (hp->hdrlen+2)<<2; | |
162 | break; | |
163 | case IPPROTO_ESP: | |
164 | if (logflags & NF_LOG_IPOPT) { | |
165 | struct ip_esp_hdr _esph; | |
166 | const struct ip_esp_hdr *eh; | |
167 | ||
168 | /* Max length: 4 "ESP " */ | |
169 | nf_log_buf_add(m, "ESP "); | |
170 | ||
171 | if (fragment) { | |
172 | nf_log_buf_add(m, ")"); | |
173 | return; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Max length: 26 "INCOMPLETE [65535 bytes] )" | |
178 | */ | |
179 | eh = skb_header_pointer(skb, ptr, sizeof(_esph), | |
180 | &_esph); | |
181 | if (eh == NULL) { | |
182 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] )", | |
183 | skb->len - ptr); | |
184 | return; | |
185 | } | |
186 | ||
187 | /* Length: 16 "SPI=0xF1234567 )" */ | |
188 | nf_log_buf_add(m, "SPI=0x%x )", | |
189 | ntohl(eh->spi)); | |
190 | } | |
191 | return; | |
192 | default: | |
193 | /* Max length: 20 "Unknown Ext Hdr 255" */ | |
194 | nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr); | |
195 | return; | |
196 | } | |
197 | if (logflags & NF_LOG_IPOPT) | |
198 | nf_log_buf_add(m, ") "); | |
199 | ||
200 | currenthdr = hp->nexthdr; | |
201 | ptr += hdrlen; | |
202 | } | |
203 | ||
204 | switch (currenthdr) { | |
205 | case IPPROTO_TCP: | |
206 | if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment, | |
207 | ptr, logflags)) | |
208 | return; | |
209 | break; | |
210 | case IPPROTO_UDP: | |
211 | case IPPROTO_UDPLITE: | |
212 | if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr)) | |
213 | return; | |
214 | break; | |
215 | case IPPROTO_ICMPV6: { | |
216 | struct icmp6hdr _icmp6h; | |
217 | const struct icmp6hdr *ic; | |
218 | ||
219 | /* Max length: 13 "PROTO=ICMPv6 " */ | |
220 | nf_log_buf_add(m, "PROTO=ICMPv6 "); | |
221 | ||
222 | if (fragment) | |
223 | break; | |
224 | ||
225 | /* Max length: 25 "INCOMPLETE [65535 bytes] " */ | |
226 | ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h); | |
227 | if (ic == NULL) { | |
228 | nf_log_buf_add(m, "INCOMPLETE [%u bytes] ", | |
229 | skb->len - ptr); | |
230 | return; | |
231 | } | |
232 | ||
233 | /* Max length: 18 "TYPE=255 CODE=255 " */ | |
234 | nf_log_buf_add(m, "TYPE=%u CODE=%u ", | |
235 | ic->icmp6_type, ic->icmp6_code); | |
236 | ||
237 | switch (ic->icmp6_type) { | |
238 | case ICMPV6_ECHO_REQUEST: | |
239 | case ICMPV6_ECHO_REPLY: | |
240 | /* Max length: 19 "ID=65535 SEQ=65535 " */ | |
241 | nf_log_buf_add(m, "ID=%u SEQ=%u ", | |
242 | ntohs(ic->icmp6_identifier), | |
243 | ntohs(ic->icmp6_sequence)); | |
244 | break; | |
245 | case ICMPV6_MGM_QUERY: | |
246 | case ICMPV6_MGM_REPORT: | |
247 | case ICMPV6_MGM_REDUCTION: | |
248 | break; | |
249 | ||
250 | case ICMPV6_PARAMPROB: | |
251 | /* Max length: 17 "POINTER=ffffffff " */ | |
252 | nf_log_buf_add(m, "POINTER=%08x ", | |
253 | ntohl(ic->icmp6_pointer)); | |
254 | /* Fall through */ | |
255 | case ICMPV6_DEST_UNREACH: | |
256 | case ICMPV6_PKT_TOOBIG: | |
257 | case ICMPV6_TIME_EXCEED: | |
258 | /* Max length: 3+maxlen */ | |
259 | if (recurse) { | |
260 | nf_log_buf_add(m, "["); | |
261 | dump_ipv6_packet(m, info, skb, | |
262 | ptr + sizeof(_icmp6h), 0); | |
263 | nf_log_buf_add(m, "] "); | |
264 | } | |
265 | ||
266 | /* Max length: 10 "MTU=65535 " */ | |
267 | if (ic->icmp6_type == ICMPV6_PKT_TOOBIG) { | |
268 | nf_log_buf_add(m, "MTU=%u ", | |
269 | ntohl(ic->icmp6_mtu)); | |
270 | } | |
271 | } | |
272 | break; | |
273 | } | |
274 | /* Max length: 10 "PROTO=255 " */ | |
275 | default: | |
276 | nf_log_buf_add(m, "PROTO=%u ", currenthdr); | |
277 | } | |
278 | ||
279 | /* Max length: 15 "UID=4294967295 " */ | |
280 | if ((logflags & NF_LOG_UID) && recurse) | |
281 | nf_log_dump_sk_uid_gid(m, skb->sk); | |
282 | ||
283 | /* Max length: 16 "MARK=0xFFFFFFFF " */ | |
284 | if (recurse && skb->mark) | |
285 | nf_log_buf_add(m, "MARK=0x%x ", skb->mark); | |
286 | } | |
287 | ||
288 | static void dump_ipv6_mac_header(struct nf_log_buf *m, | |
289 | const struct nf_loginfo *info, | |
290 | const struct sk_buff *skb) | |
291 | { | |
292 | struct net_device *dev = skb->dev; | |
293 | unsigned int logflags = 0; | |
294 | ||
295 | if (info->type == NF_LOG_TYPE_LOG) | |
296 | logflags = info->u.log.logflags; | |
297 | ||
298 | if (!(logflags & NF_LOG_MACDECODE)) | |
299 | goto fallback; | |
300 | ||
301 | switch (dev->type) { | |
302 | case ARPHRD_ETHER: | |
303 | nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ", | |
304 | eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
305 | ntohs(eth_hdr(skb)->h_proto)); | |
306 | return; | |
307 | default: | |
308 | break; | |
309 | } | |
310 | ||
311 | fallback: | |
312 | nf_log_buf_add(m, "MAC="); | |
313 | if (dev->hard_header_len && | |
314 | skb->mac_header != skb->network_header) { | |
315 | const unsigned char *p = skb_mac_header(skb); | |
316 | unsigned int len = dev->hard_header_len; | |
317 | unsigned int i; | |
318 | ||
319 | if (dev->type == ARPHRD_SIT) { | |
320 | p -= ETH_HLEN; | |
321 | ||
322 | if (p < skb->head) | |
323 | p = NULL; | |
324 | } | |
325 | ||
326 | if (p != NULL) { | |
327 | nf_log_buf_add(m, "%02x", *p++); | |
328 | for (i = 1; i < len; i++) | |
329 | nf_log_buf_add(m, ":%02x", *p++); | |
330 | } | |
331 | nf_log_buf_add(m, " "); | |
332 | ||
333 | if (dev->type == ARPHRD_SIT) { | |
334 | const struct iphdr *iph = | |
335 | (struct iphdr *)skb_mac_header(skb); | |
336 | nf_log_buf_add(m, "TUNNEL=%pI4->%pI4 ", &iph->saddr, | |
337 | &iph->daddr); | |
338 | } | |
339 | } else { | |
340 | nf_log_buf_add(m, " "); | |
341 | } | |
342 | } | |
343 | ||
344 | static void nf_log_ip6_packet(struct net *net, u_int8_t pf, | |
345 | unsigned int hooknum, const struct sk_buff *skb, | |
346 | const struct net_device *in, | |
347 | const struct net_device *out, | |
348 | const struct nf_loginfo *loginfo, | |
349 | const char *prefix) | |
350 | { | |
351 | struct nf_log_buf *m; | |
352 | ||
353 | /* FIXME: Disabled from containers until syslog ns is supported */ | |
354 | if (!net_eq(net, &init_net)) | |
355 | return; | |
356 | ||
357 | m = nf_log_buf_open(); | |
358 | ||
359 | if (!loginfo) | |
360 | loginfo = &default_loginfo; | |
361 | ||
362 | nf_log_dump_packet_common(m, pf, hooknum, skb, in, out, | |
363 | loginfo, prefix); | |
364 | ||
365 | if (in != NULL) | |
366 | dump_ipv6_mac_header(m, loginfo, skb); | |
367 | ||
368 | dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1); | |
369 | ||
370 | nf_log_buf_close(m); | |
371 | } | |
372 | ||
373 | static struct nf_logger nf_ip6_logger __read_mostly = { | |
374 | .name = "nf_log_ipv6", | |
375 | .type = NF_LOG_TYPE_LOG, | |
376 | .logfn = nf_log_ip6_packet, | |
377 | .me = THIS_MODULE, | |
378 | }; | |
379 | ||
380 | static int __net_init nf_log_ipv6_net_init(struct net *net) | |
381 | { | |
382 | return nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger); | |
383 | } | |
384 | ||
385 | static void __net_exit nf_log_ipv6_net_exit(struct net *net) | |
386 | { | |
387 | nf_log_unset(net, &nf_ip6_logger); | |
388 | } | |
389 | ||
390 | static struct pernet_operations nf_log_ipv6_net_ops = { | |
391 | .init = nf_log_ipv6_net_init, | |
392 | .exit = nf_log_ipv6_net_exit, | |
393 | }; | |
394 | ||
395 | static int __init nf_log_ipv6_init(void) | |
396 | { | |
397 | int ret; | |
398 | ||
399 | ret = register_pernet_subsys(&nf_log_ipv6_net_ops); | |
400 | if (ret < 0) | |
401 | return ret; | |
402 | ||
403 | ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger); | |
404 | if (ret < 0) { | |
405 | pr_err("failed to register logger\n"); | |
406 | goto err1; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | ||
411 | err1: | |
412 | unregister_pernet_subsys(&nf_log_ipv6_net_ops); | |
413 | return ret; | |
414 | } | |
415 | ||
416 | static void __exit nf_log_ipv6_exit(void) | |
417 | { | |
418 | unregister_pernet_subsys(&nf_log_ipv6_net_ops); | |
419 | nf_log_unregister(&nf_ip6_logger); | |
420 | } | |
421 | ||
422 | module_init(nf_log_ipv6_init); | |
423 | module_exit(nf_log_ipv6_exit); | |
424 | ||
425 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
426 | MODULE_DESCRIPTION("Netfilter IPv6 packet logging"); | |
427 | MODULE_LICENSE("GPL"); | |
428 | MODULE_ALIAS_NF_LOGGER(AF_INET6, 0); |