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 nf_ct_ftp_type {
   7         /* PORT command from client */
   8         NF_CT_FTP_PORT,
   9         /* PASV response from server */
  10         NF_CT_FTP_PASV,
  11         /* EPRT command from client */
  12         NF_CT_FTP_EPRT,
  13         /* EPSV response from server */
  14         NF_CT_FTP_EPSV,
  15 };
  16
  17 #ifdef __KERNEL__
  18
  19 #define FTP_PORT        21
  20
  21 #define NUM_SEQ_TO_REMEMBER 2
  22 /* This structure exists only once per master */
  23 struct nf_ct_ftp_master {
  24         /* Valid seq positions for cmd matching after newline */
  25         u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
  26         /* 0 means seq_match_aft_nl not set */
  27         int seq_aft_nl_num[IP_CT_DIR_MAX];
  28 };
  29
  30 struct nf_conntrack_expect;
  31
  32 /* For NAT to hook in when we find a packet which describes what other
  33  * connection we should expect. */
  34 extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb,
  35                                        enum ip_conntrack_info ctinfo,
  36                                        enum nf_ct_ftp_type type,
  37                                        unsigned int matchoff,
  38                                        unsigned int matchlen,
  39                                        struct nf_conntrack_expect *exp);
  40 #endif /* __KERNEL__ */
  41
  42 #endif /* _NF_CONNTRACK_FTP_H */