1 #ifndef _NF_NAT_HELPER_H
2 #define _NF_NAT_HELPER_H
3 /* NAT protocol helper routines. */
5 #include <net/netfilter/nf_conntrack.h>
9 /* These return true or false. */
10 extern int __nf_nat_mangle_tcp_packet(struct sk_buff *skb,
12 enum ip_conntrack_info ctinfo,
14 unsigned int match_offset,
15 unsigned int match_len,
16 const char *rep_buffer,
17 unsigned int rep_len, bool adjust);
19 static inline int nf_nat_mangle_tcp_packet(struct sk_buff *skb,
21 enum ip_conntrack_info ctinfo,
23 unsigned int match_offset,
24 unsigned int match_len,
25 const char *rep_buffer,
28 return __nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff,
29 match_offset, match_len,
30 rep_buffer, rep_len, true);
33 extern int nf_nat_mangle_udp_packet(struct sk_buff *skb,
35 enum ip_conntrack_info ctinfo,
37 unsigned int match_offset,
38 unsigned int match_len,
39 const char *rep_buffer,
40 unsigned int rep_len);
42 extern void nf_nat_set_seq_adjust(struct nf_conn *ct,
43 enum ip_conntrack_info ctinfo,
45 extern int nf_nat_seq_adjust(struct sk_buff *skb,
47 enum ip_conntrack_info ctinfo,
48 unsigned int protoff);
49 extern int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
51 enum ip_conntrack_info ctinfo,
52 unsigned int protoff);
54 /* Setup NAT on this expected conntrack so it follows master, but goes
55 * to port ct->master->saved_proto. */
56 extern void nf_nat_follow_master(struct nf_conn *ct,
57 struct nf_conntrack_expect *this);
59 extern s16 nf_nat_get_offset(const struct nf_conn *ct,
60 enum ip_conntrack_dir dir,
63 extern void nf_nat_tcp_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,