src/libfreeswan.tmp/ipcomp.h

   1 /*
   2  * IPCOMP zlib interface code.
   3  * Copyright (C) 2000  Svenning Soerensen <svenning@post5.tele.dk>
   4  * Copyright (C) 2000, 2001  Richard Guy Briggs <rgb@conscoop.ottawa.on.ca>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15
  16  RCSID $Id: ipcomp.h,v 1.1 2004/03/15 20:35:25 as Exp $
  17
  18  */
  19
  20 /* SSS */
  21
  22 #ifndef _IPCOMP_H
  23 #define _IPCOMP_H
  24
  25 /* Prefix all global deflate symbols with "ipcomp_" to avoid collisions with ppp_deflate & ext2comp */
  26 #ifndef IPCOMP_PREFIX
  27 #define IPCOMP_PREFIX
  28 #endif /* IPCOMP_PREFIX */
  29
  30 #ifndef IPPROTO_COMP
  31 #define IPPROTO_COMP 108
  32 #endif /* IPPROTO_COMP */
  33
  34 #ifdef CONFIG_IPSEC_DEBUG
  35 extern int sysctl_ipsec_debug_ipcomp;
  36 #endif /* CONFIG_IPSEC_DEBUG */
  37
  38 struct ipcomphdr {                      /* IPCOMP header */
  39     __u8    ipcomp_nh;          /* Next header (protocol) */
  40     __u8    ipcomp_flags;       /* Reserved, must be 0 */
  41     __u16   ipcomp_cpi;         /* Compression Parameter Index */
  42 };
  43
  44 extern struct inet_protocol comp_protocol;
  45 extern int sysctl_ipsec_debug_ipcomp;
  46
  47 #define IPCOMP_UNCOMPRESSABLE     0x000000001
  48 #define IPCOMP_COMPRESSIONERROR   0x000000002
  49 #define IPCOMP_PARMERROR          0x000000004
  50 #define IPCOMP_DECOMPRESSIONERROR 0x000000008
  51
  52 #define IPCOMP_ADAPT_INITIAL_TRIES      8
  53 #define IPCOMP_ADAPT_INITIAL_SKIP       4
  54 #define IPCOMP_ADAPT_SUBSEQ_TRIES       2
  55 #define IPCOMP_ADAPT_SUBSEQ_SKIP        8
  56
  57 /* Function prototypes */
  58 struct sk_buff *skb_compress(struct sk_buff *skb, struct ipsec_sa *ips, unsigned int *flags);
  59 struct sk_buff *skb_decompress(struct sk_buff *skb, struct ipsec_sa *ips, unsigned int *flags);
  60
  61 #endif /* _IPCOMP_H */