1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NF_CONNTRACK_FTP_H
3 #define _NF_CONNTRACK_FTP_H
4 
5 #include <uapi/linux/netfilter/nf_conntrack_ftp.h>
6 
7 
8 #define FTP_PORT	21
9 
10 #define NF_CT_FTP_SEQ_PICKUP	(1 << 0)
11 
12 #define NUM_SEQ_TO_REMEMBER 2
13 /* This structure exists only once per master */
14 struct nf_ct_ftp_master {
15 	/* Valid seq positions for cmd matching after newline */
16 	u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
17 	/* 0 means seq_match_aft_nl not set */
18 	u_int16_t seq_aft_nl_num[IP_CT_DIR_MAX];
19 	/* pickup sequence tracking, useful for conntrackd */
20 	u_int16_t flags[IP_CT_DIR_MAX];
21 };
22 
23 struct nf_conntrack_expect;
24 
25 /* For NAT to hook in when we find a packet which describes what other
26  * connection we should expect. */
27 extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb,
28 				       enum ip_conntrack_info ctinfo,
29 				       enum nf_ct_ftp_type type,
30 				       unsigned int protoff,
31 				       unsigned int matchoff,
32 				       unsigned int matchlen,
33 				       struct nf_conntrack_expect *exp);
34 #endif /* _NF_CONNTRACK_FTP_H */
35