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
7struct sk_buff;
8
9/* These return true or false. */
10extern 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);
17extern 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);
24extern int nf_nat_seq_adjust(struct sk_buff **pskb,
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. */
30extern void nf_nat_follow_master(struct nf_conn *ct,
31				 struct nf_conntrack_expect *this);
32#endif
33