1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NF_NAT_HELPER_H
3 #define _NF_NAT_HELPER_H
4 /* NAT protocol helper routines. */
5
6 #include <net/netfilter/nf_conntrack.h>
7
8 struct sk_buff;
9
10 /* These return true or false. */
11 bool __nf_nat_mangle_tcp_packet(struct sk_buff *skb, struct nf_conn *ct,
12 enum ip_conntrack_info ctinfo,
13 unsigned int protoff, unsigned int match_offset,
14 unsigned int match_len, const char *rep_buffer,
15 unsigned int rep_len, bool adjust);
16
nf_nat_mangle_tcp_packet(struct sk_buff * skb,struct nf_conn * ct,enum ip_conntrack_info ctinfo,unsigned int protoff,unsigned int match_offset,unsigned int match_len,const char * rep_buffer,unsigned int rep_len)17 static inline bool nf_nat_mangle_tcp_packet(struct sk_buff *skb,
18 struct nf_conn *ct,
19 enum ip_conntrack_info ctinfo,
20 unsigned int protoff,
21 unsigned int match_offset,
22 unsigned int match_len,
23 const char *rep_buffer,
24 unsigned int rep_len)
25 {
26 return __nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff,
27 match_offset, match_len,
28 rep_buffer, rep_len, true);
29 }
30
31 bool nf_nat_mangle_udp_packet(struct sk_buff *skb, struct nf_conn *ct,
32 enum ip_conntrack_info ctinfo,
33 unsigned int protoff, unsigned int match_offset,
34 unsigned int match_len, const char *rep_buffer,
35 unsigned int rep_len);
36
37 /* Setup NAT on this expected conntrack so it follows master, but goes
38 * to port ct->master->saved_proto. */
39 void nf_nat_follow_master(struct nf_conn *ct, struct nf_conntrack_expect *this);
40
41 #endif
42