include/linux/netfilter_ipv4/ip_nat_helper.h

   1 #ifndef _IP_NAT_HELPER_H
   2 #define _IP_NAT_HELPER_H
   3 /* NAT protocol helper routines. */
   4
   5 #include <linux/netfilter_ipv4/ip_conntrack.h>
   6 #include <linux/module.h>
   7
   8 struct sk_buff;
   9
  10 /* These return true or false. */
  11 extern int ip_nat_mangle_tcp_packet(struct sk_buff **skb,
  12                                 struct ip_conntrack *ct,
  13                                 enum ip_conntrack_info ctinfo,
  14                                 unsigned int match_offset,
  15                                 unsigned int match_len,
  16                                 const char *rep_buffer,
  17                                 unsigned int rep_len);
  18 extern int ip_nat_mangle_udp_packet(struct sk_buff **skb,
  19                                 struct ip_conntrack *ct,
  20                                 enum ip_conntrack_info ctinfo,
  21                                 unsigned int match_offset,
  22                                 unsigned int match_len,
  23                                 const char *rep_buffer,
  24                                 unsigned int rep_len);
  25 extern int ip_nat_seq_adjust(struct sk_buff **pskb,
  26                              struct ip_conntrack *ct,
  27                              enum ip_conntrack_info ctinfo);
  28
  29 /* Setup NAT on this expected conntrack so it follows master, but goes
  30  * to port ct->master->saved_proto. */
  31 extern void ip_nat_follow_master(struct ip_conntrack *ct,
  32                                  struct ip_conntrack_expect *this);
  33 #endif