kernel/include/net/netfilter/nf_nat_helper.h

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