root/include/net/netfilter/nf_log.h

INCLUDED FROM

#ifndef _NF_LOG_H
#define _NF_LOG_H

/* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
 * disappear once iptables is replaced with pkttables.  Please DO NOT use them
 * for any new code! */
#define NF_LOG_TCPSEQ           0x01    /* Log TCP sequence numbers */
#define NF_LOG_TCPOPT           0x02    /* Log TCP options */
#define NF_LOG_IPOPT            0x04    /* Log IP options */
#define NF_LOG_UID              0x08    /* Log UID owning local socket */
#define NF_LOG_MASK             0x0f

#define NF_LOG_TYPE_LOG         0x01
#define NF_LOG_TYPE_ULOG        0x02

struct nf_loginfo {
        u_int8_t type;
        union {
                struct {
                        u_int32_t copy_len;
                        u_int16_t group;
                        u_int16_t qthreshold;
                } ulog;
                struct {
                        u_int8_t level;
                        u_int8_t logflags;
                } log;
        } u;
};

typedef void nf_logfn(u_int8_t pf,
                      unsigned int hooknum,
                      const struct sk_buff *skb,
                      const struct net_device *in,
                      const struct net_device *out,
                      const struct nf_loginfo *li,
                      const char *prefix);

struct nf_logger {
        struct module   *me;
        nf_logfn        *logfn;
        char            *name;
};

/* Function to register/unregister log function. */
int nf_log_register(u_int8_t pf, const struct nf_logger *logger);
void nf_log_unregister(const struct nf_logger *logger);
void nf_log_unregister_pf(u_int8_t pf);

/* Calls the registered backend logging function */
void nf_log_packet(u_int8_t pf,
                   unsigned int hooknum,
                   const struct sk_buff *skb,
                   const struct net_device *in,
                   const struct net_device *out,
                   const struct nf_loginfo *li,
                   const char *fmt, ...) __attribute__ ((format(printf,7,8)));

#endif /* _NF_LOG_H */