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 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