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 #include <linux/module.h>
10 #include <linux/spinlock.h>
11 #include <linux/skbuff.h>
12 #include <linux/if_arp.h>
18 #include <net/route.h>
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>
25 static struct nf_loginfo default_loginfo
= {
26 .type
= NF_LOG_TYPE_LOG
,
30 .logflags
= NF_LOG_MASK
,
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
,
44 const struct ipv6hdr
*ih
;
46 unsigned int hdrlen
= 0;
47 unsigned int logflags
;
49 if (info
->type
== NF_LOG_TYPE_LOG
)
50 logflags
= info
->u
.log
.logflags
;
52 logflags
= NF_LOG_MASK
;
54 ih
= skb_header_pointer(skb
, ip6hoff
, sizeof(_ip6h
), &_ip6h
);
56 nf_log_buf_add(m
, "TRUNCATED");
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
);
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,
68 (ntohl(*(__be32
*)ih
) & 0x000fffff));
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
;
77 hp
= skb_header_pointer(skb
, ptr
, sizeof(_hdr
), &_hdr
);
79 nf_log_buf_add(m
, "TRUNCATED");
83 /* Max length: 48 "OPT (...) " */
84 if (logflags
& XT_LOG_IPOPT
)
85 nf_log_buf_add(m
, "OPT ( ");
88 case IPPROTO_FRAGMENT
: {
89 struct frag_hdr _fhdr
;
90 const struct frag_hdr
*fh
;
92 nf_log_buf_add(m
, "FRAG:");
93 fh
= skb_header_pointer(skb
, ptr
, sizeof(_fhdr
),
96 nf_log_buf_add(m
, "TRUNCATED ");
100 /* Max length: 6 "65535 " */
101 nf_log_buf_add(m
, "%u ", ntohs(fh
->frag_off
) & 0xFFF8);
103 /* Max length: 11 "INCOMPLETE " */
104 if (fh
->frag_off
& htons(0x0001))
105 nf_log_buf_add(m
, "INCOMPLETE ");
107 nf_log_buf_add(m
, "ID:%08x ",
108 ntohl(fh
->identification
));
110 if (ntohs(fh
->frag_off
) & 0xFFF8)
117 case IPPROTO_DSTOPTS
:
118 case IPPROTO_ROUTING
:
119 case IPPROTO_HOPOPTS
:
121 if (logflags
& XT_LOG_IPOPT
)
122 nf_log_buf_add(m
, ")");
125 hdrlen
= ipv6_optlen(hp
);
129 if (logflags
& XT_LOG_IPOPT
) {
130 struct ip_auth_hdr _ahdr
;
131 const struct ip_auth_hdr
*ah
;
133 /* Max length: 3 "AH " */
134 nf_log_buf_add(m
, "AH ");
137 nf_log_buf_add(m
, ")");
141 ah
= skb_header_pointer(skb
, ptr
, sizeof(_ahdr
),
145 * Max length: 26 "INCOMPLETE [65535
148 nf_log_buf_add(m
, "INCOMPLETE [%u bytes] )",
153 /* Length: 15 "SPI=0xF1234567 */
154 nf_log_buf_add(m
, "SPI=0x%x ", ntohl(ah
->spi
));
158 hdrlen
= (hp
->hdrlen
+2)<<2;
161 if (logflags
& XT_LOG_IPOPT
) {
162 struct ip_esp_hdr _esph
;
163 const struct ip_esp_hdr
*eh
;
165 /* Max length: 4 "ESP " */
166 nf_log_buf_add(m
, "ESP ");
169 nf_log_buf_add(m
, ")");
174 * Max length: 26 "INCOMPLETE [65535 bytes] )"
176 eh
= skb_header_pointer(skb
, ptr
, sizeof(_esph
),
179 nf_log_buf_add(m
, "INCOMPLETE [%u bytes] )",
184 /* Length: 16 "SPI=0xF1234567 )" */
185 nf_log_buf_add(m
, "SPI=0x%x )",
190 /* Max length: 20 "Unknown Ext Hdr 255" */
191 nf_log_buf_add(m
, "Unknown Ext Hdr %u", currenthdr
);
194 if (logflags
& XT_LOG_IPOPT
)
195 nf_log_buf_add(m
, ") ");
197 currenthdr
= hp
->nexthdr
;
201 switch (currenthdr
) {
203 if (nf_log_dump_tcp_header(m
, skb
, currenthdr
, fragment
,
208 case IPPROTO_UDPLITE
:
209 if (nf_log_dump_udp_header(m
, skb
, currenthdr
, fragment
, ptr
))
212 case IPPROTO_ICMPV6
: {
213 struct icmp6hdr _icmp6h
;
214 const struct icmp6hdr
*ic
;
216 /* Max length: 13 "PROTO=ICMPv6 " */
217 nf_log_buf_add(m
, "PROTO=ICMPv6 ");
222 /* Max length: 25 "INCOMPLETE [65535 bytes] " */
223 ic
= skb_header_pointer(skb
, ptr
, sizeof(_icmp6h
), &_icmp6h
);
225 nf_log_buf_add(m
, "INCOMPLETE [%u bytes] ",
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
);
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
));
242 case ICMPV6_MGM_QUERY
:
243 case ICMPV6_MGM_REPORT
:
244 case ICMPV6_MGM_REDUCTION
:
247 case ICMPV6_PARAMPROB
:
248 /* Max length: 17 "POINTER=ffffffff " */
249 nf_log_buf_add(m
, "POINTER=%08x ",
250 ntohl(ic
->icmp6_pointer
));
252 case ICMPV6_DEST_UNREACH
:
253 case ICMPV6_PKT_TOOBIG
:
254 case ICMPV6_TIME_EXCEED
:
255 /* Max length: 3+maxlen */
257 nf_log_buf_add(m
, "[");
258 dump_ipv6_packet(m
, info
, skb
,
259 ptr
+ sizeof(_icmp6h
), 0);
260 nf_log_buf_add(m
, "] ");
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
));
271 /* Max length: 10 "PROTO=255 " */
273 nf_log_buf_add(m
, "PROTO=%u ", currenthdr
);
276 /* Max length: 15 "UID=4294967295 " */
277 if ((logflags
& XT_LOG_UID
) && recurse
)
278 nf_log_dump_sk_uid_gid(m
, skb
->sk
);
280 /* Max length: 16 "MARK=0xFFFFFFFF " */
281 if (recurse
&& skb
->mark
)
282 nf_log_buf_add(m
, "MARK=0x%x ", skb
->mark
);
285 static void dump_ipv6_mac_header(struct nf_log_buf
*m
,
286 const struct nf_loginfo
*info
,
287 const struct sk_buff
*skb
)
289 struct net_device
*dev
= skb
->dev
;
290 unsigned int logflags
= 0;
292 if (info
->type
== NF_LOG_TYPE_LOG
)
293 logflags
= info
->u
.log
.logflags
;
295 if (!(logflags
& XT_LOG_MACDECODE
))
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
));
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
;
316 if (dev
->type
== ARPHRD_SIT
) {
324 nf_log_buf_add(m
, "%02x", *p
++);
325 for (i
= 1; i
< len
; i
++)
326 nf_log_buf_add(m
, ":%02x", *p
++);
328 nf_log_buf_add(m
, " ");
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
,
337 nf_log_buf_add(m
, " ");
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
,
348 struct nf_log_buf
*m
;
350 /* FIXME: Disabled from containers until syslog ns is supported */
351 if (!net_eq(net
, &init_net
))
354 m
= nf_log_buf_open();
357 loginfo
= &default_loginfo
;
359 nf_log_dump_packet_common(m
, pf
, hooknum
, skb
, in
, out
,
363 dump_ipv6_mac_header(m
, loginfo
, skb
);
365 dump_ipv6_packet(m
, loginfo
, skb
, skb_network_offset(skb
), 1);
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
,
377 static int __net_init
nf_log_ipv6_net_init(struct net
*net
)
379 nf_log_set(net
, NFPROTO_IPV6
, &nf_ip6_logger
);
383 static void __net_exit
nf_log_ipv6_net_exit(struct net
*net
)
385 nf_log_unset(net
, &nf_ip6_logger
);
388 static struct pernet_operations nf_log_ipv6_net_ops
= {
389 .init
= nf_log_ipv6_net_init
,
390 .exit
= nf_log_ipv6_net_exit
,
393 static int __init
nf_log_ipv6_init(void)
397 ret
= register_pernet_subsys(&nf_log_ipv6_net_ops
);
401 nf_log_register(NFPROTO_IPV6
, &nf_ip6_logger
);
405 static void __exit
nf_log_ipv6_exit(void)
407 unregister_pernet_subsys(&nf_log_ipv6_net_ops
);
408 nf_log_unregister(&nf_ip6_logger
);
411 module_init(nf_log_ipv6_init
);
412 module_exit(nf_log_ipv6_exit
);
414 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
415 MODULE_DESCRIPTION("Netfilter IPv4 packet logging");
416 MODULE_LICENSE("GPL");
417 MODULE_ALIAS_NF_LOGGER(AF_INET6
, 0);