LXR linux/include/net/netfilter/nf_nat

   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
   7struct sk_buff;
   8
   9/* These return true or false. */
  10extern 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);
  17extern 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);
  24extern int nf_nat_seq_adjust(struct sk_buff *skb,
  25                             struct nf_conn *ct,
  26                             enum ip_conntrack_info ctinfo);
  27extern 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. */
  33extern void nf_nat_follow_master(struct nf_conn *ct,
  34                                 struct nf_conntrack_expect *this);
  35
  36extern s16 nf_nat_get_offset(const struct nf_conn *ct,
  37                             enum ip_conntrack_dir dir,
  38                             u32 seq);
  39#endif
  40