1#ifndef _NF_LOG_H
2#define _NF_LOG_H
3
4#include <linux/netfilter.h>
5
6/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
7 * disappear once iptables is replaced with pkttables.  Please DO NOT use them
8 * for any new code! */
9#define NF_LOG_TCPSEQ		0x01	/* Log TCP sequence numbers */
10#define NF_LOG_TCPOPT		0x02	/* Log TCP options */
11#define NF_LOG_IPOPT		0x04	/* Log IP options */
12#define NF_LOG_UID		0x08	/* Log UID owning local socket */
13#define NF_LOG_MASK		0x0f
14
15enum nf_log_type {
16	NF_LOG_TYPE_LOG		= 0,
17	NF_LOG_TYPE_ULOG,
18	NF_LOG_TYPE_MAX
19};
20
21struct nf_loginfo {
22	u_int8_t type;
23	union {
24		struct {
25			u_int32_t copy_len;
26			u_int16_t group;
27			u_int16_t qthreshold;
28		} ulog;
29		struct {
30			u_int8_t level;
31			u_int8_t logflags;
32		} log;
33	} u;
34};
35
36typedef void nf_logfn(struct net *net,
37		      u_int8_t pf,
38		      unsigned int hooknum,
39		      const struct sk_buff *skb,
40		      const struct net_device *in,
41		      const struct net_device *out,
42		      const struct nf_loginfo *li,
43		      const char *prefix);
44
45struct nf_logger {
46	char			*name;
47	enum nf_log_type	type;
48	nf_logfn 		*logfn;
49	struct module		*me;
50};
51
52/* Function to register/unregister log function. */
53int nf_log_register(u_int8_t pf, struct nf_logger *logger);
54void nf_log_unregister(struct nf_logger *logger);
55
56void nf_log_set(struct net *net, u_int8_t pf,
57		const struct nf_logger *logger);
58void nf_log_unset(struct net *net, const struct nf_logger *logger);
59
60int nf_log_bind_pf(struct net *net, u_int8_t pf,
61		   const struct nf_logger *logger);
62void nf_log_unbind_pf(struct net *net, u_int8_t pf);
63
64int nf_logger_find_get(int pf, enum nf_log_type type);
65void nf_logger_put(int pf, enum nf_log_type type);
66void nf_logger_request_module(int pf, enum nf_log_type type);
67
68#define MODULE_ALIAS_NF_LOGGER(family, type) \
69	MODULE_ALIAS("nf-logger-" __stringify(family) "-" __stringify(type))
70
71/* Calls the registered backend logging function */
72__printf(8, 9)
73void nf_log_packet(struct net *net,
74		   u_int8_t pf,
75		   unsigned int hooknum,
76		   const struct sk_buff *skb,
77		   const struct net_device *in,
78		   const struct net_device *out,
79		   const struct nf_loginfo *li,
80		   const char *fmt, ...);
81
82struct nf_log_buf;
83
84struct nf_log_buf *nf_log_buf_open(void);
85__printf(2, 3) int nf_log_buf_add(struct nf_log_buf *m, const char *f, ...);
86void nf_log_buf_close(struct nf_log_buf *m);
87
88/* common logging functions */
89int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
90			   u8 proto, int fragment, unsigned int offset);
91int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
92			   u8 proto, int fragment, unsigned int offset,
93			   unsigned int logflags);
94void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk);
95void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
96			       unsigned int hooknum, const struct sk_buff *skb,
97			       const struct net_device *in,
98			       const struct net_device *out,
99			       const struct nf_loginfo *loginfo,
100			       const char *prefix);
101
102#endif /* _NF_LOG_H */
103