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 extern int nf_nat_mangle_tcp_packet(struct sk_buff *skb,
  11                                     struct nf_conn *ct,
  12                                     enum ip_conntrack_info ctinfo,
  13                                     unsigned int match_offset,
  14                                     unsigned int match_len,
  15                                     const char *rep_buffer,
  16                                     unsigned int rep_len);
  17 extern int nf_nat_mangle_udp_packet(struct sk_buff *skb,
  18                                     struct nf_conn *ct,
  19                                     enum ip_conntrack_info ctinfo,
  20                                     unsigned int match_offset,
  21                                     unsigned int match_len,
  22                                     const char *rep_buffer,
  23                                     unsigned int rep_len);
  24 extern int nf_nat_seq_adjust(struct sk_buff *skb,
  25                              struct nf_conn *ct,
  26                              enum ip_conntrack_info ctinfo);
  27 extern int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
  28                                      struct nf_conn *ct,
  29                                      enum ip_conntrack_info ctinfo);
  30
  31 /* Setup NAT on this expected conntrack so it follows master, but goes
  32  * to port ct->master->saved_proto. */
  33 extern void nf_nat_follow_master(struct nf_conn *ct,
  34                                  struct nf_conntrack_expect *this);
  35
  36 extern s16 nf_nat_get_offset(const struct nf_conn *ct,
  37                              enum ip_conntrack_dir dir,
  38                              u32 seq);
  39 #endif