1 #ifndef _IP_NAT_HELPER_H
2 #define _IP_NAT_HELPER_H
3 /* NAT protocol helper routines. */
5 #include <linux/netfilter_ipv4/ip_conntrack.h>
6 #include <linux/module.h>
10 /* These return true or false. */
11 extern int ip_nat_mangle_tcp_packet(struct sk_buff
**skb
,
12 struct ip_conntrack
*ct
,
13 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
);
18 extern int ip_nat_mangle_udp_packet(struct sk_buff
**skb
,
19 struct ip_conntrack
*ct
,
20 enum ip_conntrack_info ctinfo
,
21 unsigned int match_offset
,
22 unsigned int match_len
,
23 const char *rep_buffer
,
24 unsigned int rep_len
);
25 extern int ip_nat_seq_adjust(struct sk_buff
**pskb
,
26 struct ip_conntrack
*ct
,
27 enum ip_conntrack_info ctinfo
);
29 /* Setup NAT on this expected conntrack so it follows master, but goes
30 * to port ct->master->saved_proto. */
31 extern void ip_nat_follow_master(struct ip_conntrack
*ct
,
32 struct ip_conntrack_expect
*this);