1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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.
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
21 #include <net/route.h>
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>
28 static struct nf_loginfo default_loginfo = {
29 .type = NF_LOG_TYPE_LOG,
32 .level = LOGLEVEL_NOTICE,
33 .logflags = NF_LOG_MASK,
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,
47 const struct ipv6hdr *ih;
49 unsigned int hdrlen = 0;
50 unsigned int logflags;
52 if (info->type == NF_LOG_TYPE_LOG)
53 logflags = info->u.log.logflags;
55 logflags = NF_LOG_MASK;
57 ih = skb_header_pointer(skb, ip6hoff, sizeof(_ip6h), &_ip6h);
59 nf_log_buf_add(m, "TRUNCATED");
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);
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,
71 (ntohl(*(__be32 *)ih) & 0x000fffff));
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;
80 hp = skb_header_pointer(skb, ptr, sizeof(_hdr), &_hdr);
82 nf_log_buf_add(m, "TRUNCATED");
86 /* Max length: 48 "OPT (...) " */
87 if (logflags & XT_LOG_IPOPT)
88 nf_log_buf_add(m, "OPT ( ");
91 case IPPROTO_FRAGMENT: {
92 struct frag_hdr _fhdr;
93 const struct frag_hdr *fh;
95 nf_log_buf_add(m, "FRAG:");
96 fh = skb_header_pointer(skb, ptr, sizeof(_fhdr),
99 nf_log_buf_add(m, "TRUNCATED ");
103 /* Max length: 6 "65535 " */
104 nf_log_buf_add(m, "%u ", ntohs(fh->frag_off) & 0xFFF8);
106 /* Max length: 11 "INCOMPLETE " */
107 if (fh->frag_off & htons(0x0001))
108 nf_log_buf_add(m, "INCOMPLETE ");
110 nf_log_buf_add(m, "ID:%08x ",
111 ntohl(fh->identification));
113 if (ntohs(fh->frag_off) & 0xFFF8)
120 case IPPROTO_DSTOPTS:
121 case IPPROTO_ROUTING:
122 case IPPROTO_HOPOPTS:
124 if (logflags & XT_LOG_IPOPT)
125 nf_log_buf_add(m, ")");
128 hdrlen = ipv6_optlen(hp);
132 if (logflags & XT_LOG_IPOPT) {
133 struct ip_auth_hdr _ahdr;
134 const struct ip_auth_hdr *ah;
136 /* Max length: 3 "AH " */
137 nf_log_buf_add(m, "AH ");
140 nf_log_buf_add(m, ")");
144 ah = skb_header_pointer(skb, ptr, sizeof(_ahdr),
148 * Max length: 26 "INCOMPLETE [65535
151 nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
156 /* Length: 15 "SPI=0xF1234567 */
157 nf_log_buf_add(m, "SPI=0x%x ", ntohl(ah->spi));
161 hdrlen = (hp->hdrlen+2)<<2;
164 if (logflags & XT_LOG_IPOPT) {
165 struct ip_esp_hdr _esph;
166 const struct ip_esp_hdr *eh;
168 /* Max length: 4 "ESP " */
169 nf_log_buf_add(m, "ESP ");
172 nf_log_buf_add(m, ")");
177 * Max length: 26 "INCOMPLETE [65535 bytes] )"
179 eh = skb_header_pointer(skb, ptr, sizeof(_esph),
182 nf_log_buf_add(m, "INCOMPLETE [%u bytes] )",
187 /* Length: 16 "SPI=0xF1234567 )" */
188 nf_log_buf_add(m, "SPI=0x%x )",
193 /* Max length: 20 "Unknown Ext Hdr 255" */
194 nf_log_buf_add(m, "Unknown Ext Hdr %u", currenthdr);
197 if (logflags & XT_LOG_IPOPT)
198 nf_log_buf_add(m, ") ");
200 currenthdr = hp->nexthdr;
204 switch (currenthdr) {
206 if (nf_log_dump_tcp_header(m, skb, currenthdr, fragment,
211 case IPPROTO_UDPLITE:
212 if (nf_log_dump_udp_header(m, skb, currenthdr, fragment, ptr))
215 case IPPROTO_ICMPV6: {
216 struct icmp6hdr _icmp6h;
217 const struct icmp6hdr *ic;
219 /* Max length: 13 "PROTO=ICMPv6 " */
220 nf_log_buf_add(m, "PROTO=ICMPv6 ");
225 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
226 ic = skb_header_pointer(skb, ptr, sizeof(_icmp6h), &_icmp6h);
228 nf_log_buf_add(m, "INCOMPLETE [%u bytes] ",
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);
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));
245 case ICMPV6_MGM_QUERY:
246 case ICMPV6_MGM_REPORT:
247 case ICMPV6_MGM_REDUCTION:
250 case ICMPV6_PARAMPROB:
251 /* Max length: 17 "POINTER=ffffffff " */
252 nf_log_buf_add(m, "POINTER=%08x ",
253 ntohl(ic->icmp6_pointer));
255 case ICMPV6_DEST_UNREACH:
256 case ICMPV6_PKT_TOOBIG:
257 case ICMPV6_TIME_EXCEED:
258 /* Max length: 3+maxlen */
260 nf_log_buf_add(m, "[");
261 dump_ipv6_packet(m, info, skb,
262 ptr + sizeof(_icmp6h), 0);
263 nf_log_buf_add(m, "] ");
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));
274 /* Max length: 10 "PROTO=255 " */
276 nf_log_buf_add(m, "PROTO=%u ", currenthdr);
279 /* Max length: 15 "UID=4294967295 " */
280 if ((logflags & XT_LOG_UID) && recurse)
281 nf_log_dump_sk_uid_gid(m, skb->sk);
283 /* Max length: 16 "MARK=0xFFFFFFFF " */
284 if (recurse && skb->mark)
285 nf_log_buf_add(m, "MARK=0x%x ", skb->mark);
288 static void dump_ipv6_mac_header(struct nf_log_buf *m,
289 const struct nf_loginfo *info,
290 const struct sk_buff *skb)
292 struct net_device *dev = skb->dev;
293 unsigned int logflags = 0;
295 if (info->type == NF_LOG_TYPE_LOG)
296 logflags = info->u.log.logflags;
298 if (!(logflags & XT_LOG_MACDECODE))
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));
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;
319 if (dev->type == ARPHRD_SIT) {
327 nf_log_buf_add(m, "%02x", *p++);
328 for (i = 1; i < len; i++)
329 nf_log_buf_add(m, ":%02x", *p++);
331 nf_log_buf_add(m, " ");
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,
340 nf_log_buf_add(m, " ");
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,
351 struct nf_log_buf *m;
353 /* FIXME: Disabled from containers until syslog ns is supported */
354 if (!net_eq(net, &init_net))
357 m = nf_log_buf_open();
360 loginfo = &default_loginfo;
362 nf_log_dump_packet_common(m, pf, hooknum, skb, in, out,
366 dump_ipv6_mac_header(m, loginfo, skb);
368 dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);
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,
380 static int __net_init nf_log_ipv6_net_init(struct net *net)
382 nf_log_set(net, NFPROTO_IPV6, &nf_ip6_logger);
386 static void __net_exit nf_log_ipv6_net_exit(struct net *net)
388 nf_log_unset(net, &nf_ip6_logger);
391 static struct pernet_operations nf_log_ipv6_net_ops = {
392 .init = nf_log_ipv6_net_init,
393 .exit = nf_log_ipv6_net_exit,
396 static int __init nf_log_ipv6_init(void)
400 ret = register_pernet_subsys(&nf_log_ipv6_net_ops);
404 ret = nf_log_register(NFPROTO_IPV6, &nf_ip6_logger);
406 pr_err("failed to register logger\n");
413 unregister_pernet_subsys(&nf_log_ipv6_net_ops);
417 static void __exit nf_log_ipv6_exit(void)
419 unregister_pernet_subsys(&nf_log_ipv6_net_ops);
420 nf_log_unregister(&nf_ip6_logger);
423 module_init(nf_log_ipv6_init);
424 module_exit(nf_log_ipv6_exit);
426 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
427 MODULE_DESCRIPTION("Netfilter IPv6 packet logging");
428 MODULE_LICENSE("GPL");
429 MODULE_ALIAS_NF_LOGGER(AF_INET6, 0);