1 #ifndef _NF_NAT_HELPER_H
2 #define _NF_NAT_HELPER_H
3 /* NAT protocol helper routines. */
4
5 #include <net/netfilter/nf_conntrack.h>
6
7 struct sk_buff;
8
9 /* These return true or false. */
10 extern int nf_nat_mangle_tcp_packet(struct sk_buff *skb,
11 struct nf_conn *ct,
12 enum ip_conntrack_info ctinfo,
13 unsigned int match_offset,
14 unsigned int match_len,
15 const char *rep_buffer,
16 unsigned int rep_len);
17 extern int nf_nat_mangle_udp_packet(struct sk_buff *skb,
18 struct nf_conn *ct,
19 enum ip_conntrack_info ctinfo,
20 unsigned int match_offset,
21 unsigned int match_len,
22 const char *rep_buffer,
23 unsigned int rep_len);
24 extern int nf_nat_seq_adjust(struct sk_buff *skb,
25 struct nf_conn *ct,
26 enum ip_conntrack_info ctinfo);
27
28 /* Setup NAT on this expected conntrack so it follows master, but goes
29 * to port ct->master->saved_proto. */
30 extern void nf_nat_follow_master(struct nf_conn *ct,
31 struct nf_conntrack_expect *this);
32 #endif
33
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