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 */
43