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