1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NF_CONNTRACK_FTP_H
3 #define _NF_CONNTRACK_FTP_H
4 
5 #include <linux/netfilter.h>
6 #include <linux/skbuff.h>
7 #include <linux/types.h>
8 #include <net/netfilter/nf_conntrack_expect.h>
9 #include <uapi/linux/netfilter/nf_conntrack_ftp.h>
10 #include <uapi/linux/netfilter/nf_conntrack_tuple_common.h>
11 
12 #define FTP_PORT	21
13 
14 #define NF_CT_FTP_SEQ_PICKUP	(1 << 0)
15 
16 #define NUM_SEQ_TO_REMEMBER 2
17 /* This structure exists only once per master */
18 struct nf_ct_ftp_master {
19 	/* Valid seq positions for cmd matching after newline */
20 	u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
21 	/* 0 means seq_match_aft_nl not set */
22 	u_int16_t seq_aft_nl_num[IP_CT_DIR_MAX];
23 	/* pickup sequence tracking, useful for conntrackd */
24 	u_int16_t flags[IP_CT_DIR_MAX];
25 };
26 
27 /* For NAT to hook in when we find a packet which describes what other
28  * connection we should expect. */
29 extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb,
30 				       enum ip_conntrack_info ctinfo,
31 				       enum nf_ct_ftp_type type,
32 				       unsigned int protoff,
33 				       unsigned int matchoff,
34 				       unsigned int matchlen,
35 				       struct nf_conntrack_expect *exp);
36 #endif /* _NF_CONNTRACK_FTP_H */
37