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 protoff,
  14                                      unsigned int match_offset,
  15                                      unsigned int match_len,
  16                                      const char *rep_buffer,
  17                                      unsigned int rep_len, bool adjust);
  18
  19static inline int nf_nat_mangle_tcp_packet(struct sk_buff *skb,
  20                                           struct nf_conn *ct,
  21                                           enum ip_conntrack_info ctinfo,
  22                                           unsigned int protoff,
  23                                           unsigned int match_offset,
  24                                           unsigned int match_len,
  25                                           const char *rep_buffer,
  26                                           unsigned int rep_len)
  27{
  28        return __nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff,
  29                                          match_offset, match_len,
  30                                          rep_buffer, rep_len, true);
  31}
  32
  33extern int nf_nat_mangle_udp_packet(struct sk_buff *skb,
  34                                    struct nf_conn *ct,
  35                                    enum ip_conntrack_info ctinfo,
  36                                    unsigned int protoff,
  37                                    unsigned int match_offset,
  38                                    unsigned int match_len,
  39                                    const char *rep_buffer,
  40                                    unsigned int rep_len);
  41
  42extern void nf_nat_set_seq_adjust(struct nf_conn *ct,
  43                                  enum ip_conntrack_info ctinfo,
  44                                  __be32 seq, s16 off);
  45extern int nf_nat_seq_adjust(struct sk_buff *skb,
  46                             struct nf_conn *ct,
  47                             enum ip_conntrack_info ctinfo,
  48                             unsigned int protoff);
  49extern int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
  50                                     struct nf_conn *ct,
  51                                     enum ip_conntrack_info ctinfo,
  52                                     unsigned int protoff);
  53
  54/* Setup NAT on this expected conntrack so it follows master, but goes
  55 * to port ct->master->saved_proto. */
  56extern void nf_nat_follow_master(struct nf_conn *ct,
  57                                 struct nf_conntrack_expect *this);
  58
  59extern s16 nf_nat_get_offset(const struct nf_conn *ct,
  60                             enum ip_conntrack_dir dir,
  61                             u32 seq);
  62
  63extern void nf_nat_tcp_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
  64                                  u32 dir, int off);
  65
  66#endif
  67