include/net/netfilter/nf_nat_helper.h

   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 <linux/skbuff.h>
   7 #include <net/netfilter/nf_conntrack.h>
   8 #include <net/netfilter/nf_conntrack_expect.h>
   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