include/linux/netfilter/nf_conntrack_ftp.h

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