#ifndef _NET_IPCOMP_H
  #define _NET_IPCOMP_H

  #include <linux/types.h>

  #define IPCOMP_SCRATCH_SIZE     65400

  struct crypto_comp;

  struct ipcomp_data {
  	u16 threshold;

  	struct crypto_comp * __percpu *tfms;

  };

  struct ip_comp_hdr;
  struct sk_buff;

  struct xfrm_state;
  
  int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb);
  int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb);
  void ipcomp_destroy(struct xfrm_state *x);
  int ipcomp_init_state(struct xfrm_state *x);

  
  static inline struct ip_comp_hdr *ip_comp_hdr(const struct sk_buff *skb)
  {
  	return (struct ip_comp_hdr *)skb_transport_header(skb);
  }

  #endif