include/linux/netfilter_ipv4/ip_conntrack_ftp.h

   1 #ifndef _IP_CONNTRACK_FTP_H
   2 #define _IP_CONNTRACK_FTP_H
   3 /* FTP tracking. */
   4
   5 #ifdef __KERNEL__
   6
   7 #define FTP_PORT        21
   8
   9 #endif /* __KERNEL__ */
  10
  11 enum ip_ct_ftp_type
  12 {
  13         /* PORT command from client */
  14         IP_CT_FTP_PORT,
  15         /* PASV response from server */
  16         IP_CT_FTP_PASV,
  17         /* EPRT command from client */
  18         IP_CT_FTP_EPRT,
  19         /* EPSV response from server */
  20         IP_CT_FTP_EPSV,
  21 };
  22
  23 #define NUM_SEQ_TO_REMEMBER 2
  24 /* This structure exists only once per master */
  25 struct ip_ct_ftp_master {
  26         /* Valid seq positions for cmd matching after newline */
  27         u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
  28         /* 0 means seq_match_aft_nl not set */
  29         int seq_aft_nl_num[IP_CT_DIR_MAX];
  30 };
  31
  32 struct ip_conntrack_expect;
  33
  34 /* For NAT to hook in when we find a packet which describes what other
  35  * connection we should expect. */
  36 extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
  37                                        enum ip_conntrack_info ctinfo,
  38                                        enum ip_ct_ftp_type type,
  39                                        unsigned int matchoff,
  40                                        unsigned int matchlen,
  41                                        struct ip_conntrack_expect *exp,
  42                                        u32 *seq);
  43 #endif /* _IP_CONNTRACK_FTP_H */