nf_log.h

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#ifndef _NF_LOG_H
#define _NF_LOG_H

#include <linux/netfilter.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;
    struct list_head    list[NFPROTO_NUMPROTO];
};

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

int nf_log_bind_pf(u_int8_t pf, const struct nf_logger *logger);
void nf_log_unbind_pf(u_int8_t pf);

/* Calls the registered backend logging function */
__printf(7, 8)
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, ...);

#endif /* _NF_LOG_H */