nf_conntrack_ftp.h

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#ifndef _NF_CONNTRACK_FTP_H
#define _NF_CONNTRACK_FTP_H

#include <uapi/linux/netfilter/nf_conntrack_ftp.h>


#define FTP_PORT    21

#define NF_CT_FTP_SEQ_PICKUP    (1 << 0)

#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 */
    u_int16_t seq_aft_nl_num[IP_CT_DIR_MAX];
    /* pickup sequence tracking, useful for conntrackd */
    u_int16_t flags[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 protoff,
                       unsigned int matchoff,
                       unsigned int matchlen,
                       struct nf_conntrack_expect *exp);
#endif /* _NF_CONNTRACK_FTP_H */