root/include/linux/netfilter/nf_conntrack_ftp.h

INCLUDED FROM

#ifndef _NF_CONNTRACK_FTP_H
#define _NF_CONNTRACK_FTP_H
/* FTP tracking. */

/* This enum is exposed to userspace */
enum nf_ct_ftp_type
{
        /* PORT command from client */
        NF_CT_FTP_PORT,
        /* PASV response from server */
        NF_CT_FTP_PASV,
        /* EPRT command from client */
        NF_CT_FTP_EPRT,
        /* EPSV response from server */
        NF_CT_FTP_EPSV,
};

#ifdef __KERNEL__

#define FTP_PORT        21

#define NUM_SEQ_TO_REMEMBER 2
/* This structure exists only once per master */
struct nf_ct_ftp_master {
        /* Valid seq positions for cmd matching after newline */
        u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
        /* 0 means seq_match_aft_nl not set */
        int seq_aft_nl_num[IP_CT_DIR_MAX];
};

struct nf_conntrack_expect;

/* For NAT to hook in when we find a packet which describes what other
 * connection we should expect. */
extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb,
                                       enum ip_conntrack_info ctinfo,
                                       enum nf_ct_ftp_type type,
                                       unsigned int matchoff,
                                       unsigned int matchlen,
                                       struct nf_conntrack_expect *exp);
#endif /* __KERNEL__ */

#endif /* _NF_CONNTRACK_FTP_H */