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Diffstat (limited to 'src/libfreeswan/ipsec_ah.h')
| -rw-r--r-- | src/libfreeswan/ipsec_ah.h | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/src/libfreeswan/ipsec_ah.h b/src/libfreeswan/ipsec_ah.h new file mode 100644 index 000000000..e088288d3 --- /dev/null +++ b/src/libfreeswan/ipsec_ah.h @@ -0,0 +1,235 @@ +/* + * Authentication Header declarations + * Copyright (C) 1996, 1997 John Ioannidis. + * Copyright (C) 1998, 1999, 2000, 2001 Richard Guy Briggs. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * RCSID $Id: ipsec_ah.h,v 1.2 2004/03/22 21:53:18 as Exp $ + */ + +#include "ipsec_md5h.h" +#include "ipsec_sha1.h" + +#ifndef IPPROTO_AH +#define IPPROTO_AH 51 +#endif /* IPPROTO_AH */ + +#define AH_FLENGTH 12 /* size of fixed part */ +#define AHMD5_KMAX 64 /* MD5 max 512 bits key */ +#define AHMD5_AMAX 12 /* MD5 96 bits of authenticator */ + +#define AHMD596_KLEN 16 /* MD5 128 bits key */ +#define AHSHA196_KLEN 20 /* SHA1 160 bits key */ + +#define AHMD596_ALEN 16 /* MD5 128 bits authentication length */ +#define AHSHA196_ALEN 20 /* SHA1 160 bits authentication length */ + +#define AHMD596_BLKLEN 64 /* MD5 block length */ +#define AHSHA196_BLKLEN 64 /* SHA1 block length */ +#define AHSHA2_256_BLKLEN 64 /* SHA2-256 block length */ +#define AHSHA2_384_BLKLEN 128 /* SHA2-384 block length (?) */ +#define AHSHA2_512_BLKLEN 128 /* SHA2-512 block length */ + +#define AH_BLKLEN_MAX 128 /* keep up to date! */ + +#define AH_AMAX AHSHA196_ALEN /* keep up to date! */ +#define AHHMAC_HASHLEN 12 /* authenticator length of 96bits */ +#define AHHMAC_RPLLEN 4 /* 32 bit replay counter */ + +#define DB_AH_PKTRX 0x0001 +#define DB_AH_PKTRX2 0x0002 +#define DB_AH_DMP 0x0004 +#define DB_AH_IPSA 0x0010 +#define DB_AH_XF 0x0020 +#define DB_AH_INAU 0x0040 +#define DB_AH_REPLAY 0x0100 + +#ifdef __KERNEL__ + +/* General HMAC algorithm is described in RFC 2104 */ + +#define HMAC_IPAD 0x36 +#define HMAC_OPAD 0x5C + +struct md5_ctx { + MD5_CTX ictx; /* context after H(K XOR ipad) */ + MD5_CTX octx; /* context after H(K XOR opad) */ +}; + +struct sha1_ctx { + SHA1_CTX ictx; /* context after H(K XOR ipad) */ + SHA1_CTX octx; /* context after H(K XOR opad) */ +}; + +struct auth_alg { + void (*init)(void *ctx); + void (*update)(void *ctx, unsigned char *bytes, __u32 len); + void (*final)(unsigned char *hash, void *ctx); + int hashlen; +}; + +extern struct inet_protocol ah_protocol; + +struct options; + +extern int +ah_rcv(struct sk_buff *skb, + struct device *dev, + struct options *opt, + __u32 daddr, + unsigned short len, + __u32 saddr, + int redo, + struct inet_protocol *protocol); + +struct ahhdr /* Generic AH header */ +{ + __u8 ah_nh; /* Next header (protocol) */ + __u8 ah_hl; /* AH length, in 32-bit words */ + __u16 ah_rv; /* reserved, must be 0 */ + __u32 ah_spi; /* Security Parameters Index */ + __u32 ah_rpl; /* Replay prevention */ + __u8 ah_data[AHHMAC_HASHLEN];/* Authentication hash */ +}; +#define AH_BASIC_LEN 8 /* basic AH header is 8 bytes, nh,hl,rv,spi + * and the ah_hl, says how many bytes after that + * to cover. */ + + +#ifdef CONFIG_IPSEC_DEBUG +extern int debug_ah; +#endif /* CONFIG_IPSEC_DEBUG */ +#endif /* __KERNEL__ */ + +/* + * $Log: ipsec_ah.h,v $ + * Revision 1.2 2004/03/22 21:53:18 as + * merged alg-0.8.1 branch with HEAD + * + * Revision 1.1.4.1 2004/03/16 09:48:18 as + * alg-0.8.1rc12 patch merged + * + * Revision 1.1 2004/03/15 20:35:25 as + * added files from freeswan-2.04-x509-1.5.3 + * + * Revision 1.20 2003/02/06 02:21:34 rgb + * + * Moved "struct auth_alg" from ipsec_rcv.c to ipsec_ah.h . + * Changed "struct ah" to "struct ahhdr" and "struct esp" to "struct esphdr". + * Removed "#ifdef INBOUND_POLICY_CHECK_eroute" dead code. + * + * Revision 1.19 2002/09/16 21:19:13 mcr + * fixes for west-ah-icmp-01 - length of AH header must be + * calculated properly, and next_header field properly copied. + * + * Revision 1.18 2002/05/14 02:37:02 rgb + * Change reference from _TDB to _IPSA. + * + * Revision 1.17 2002/04/24 07:36:46 mcr + * Moved from ./klips/net/ipsec/ipsec_ah.h,v + * + * Revision 1.16 2002/02/20 01:27:06 rgb + * Ditched a pile of structs only used by the old Netlink interface. + * + * Revision 1.15 2001/12/11 02:35:57 rgb + * Change "struct net_device" to "struct device" for 2.2 compatibility. + * + * Revision 1.14 2001/11/26 09:23:47 rgb + * Merge MCR's ipsec_sa, eroute, proc and struct lifetime changes. + * + * Revision 1.13.2.1 2001/09/25 02:18:24 mcr + * replace "struct device" with "struct netdevice" + * + * Revision 1.13 2001/06/14 19:35:08 rgb + * Update copyright date. + * + * Revision 1.12 2000/09/12 03:21:20 rgb + * Cleared out unused htonq. + * + * Revision 1.11 2000/09/08 19:12:55 rgb + * Change references from DEBUG_IPSEC to CONFIG_IPSEC_DEBUG. + * + * Revision 1.10 2000/01/21 06:13:10 rgb + * Tidied up spacing. + * Added macros for HMAC padding magic numbers.(kravietz) + * + * Revision 1.9 1999/12/07 18:16:23 rgb + * Fixed comments at end of #endif lines. + * + * Revision 1.8 1999/04/11 00:28:56 henry + * GPL boilerplate + * + * Revision 1.7 1999/04/06 04:54:25 rgb + * Fix/Add RCSID Id: and Log: bits to make PHMDs happy. This includes + * patch shell fixes. + * + * Revision 1.6 1999/01/26 02:06:01 rgb + * Removed CONFIG_IPSEC_ALGO_SWITCH macro. + * + * Revision 1.5 1999/01/22 06:17:49 rgb + * Updated macro comments. + * Added context types to support algorithm switch code. + * 64-bit clean-up -- converting 'u long long' to __u64. + * + * Revision 1.4 1998/07/14 15:54:56 rgb + * Add #ifdef __KERNEL__ to protect kernel-only structures. + * + * Revision 1.3 1998/06/30 18:05:16 rgb + * Comment out references to htonq. + * + * Revision 1.2 1998/06/25 19:33:46 rgb + * Add prototype for protocol receive function. + * Rearrange for more logical layout. + * + * Revision 1.1 1998/06/18 21:27:43 henry + * move sources from klips/src to klips/net/ipsec, to keep stupid + * kernel-build scripts happier in the presence of symlinks + * + * Revision 1.4 1998/05/18 22:28:43 rgb + * Disable key printing facilities from /proc/net/ipsec_*. + * + * Revision 1.3 1998/04/21 21:29:07 rgb + * Rearrange debug switches to change on the fly debug output from user + * space. Only kernel changes checked in at this time. radij.c was also + * changed to temporarily remove buggy debugging code in rj_delete causing + * an OOPS and hence, netlink device open errors. + * + * Revision 1.2 1998/04/12 22:03:17 rgb + * Updated ESP-3DES-HMAC-MD5-96, + * ESP-DES-HMAC-MD5-96, + * AH-HMAC-MD5-96, + * AH-HMAC-SHA1-96 since Henry started freeswan cvs repository + * from old standards (RFC182[5-9] to new (as of March 1998) drafts. + * + * Fixed eroute references in /proc/net/ipsec*. + * + * Started to patch module unloading memory leaks in ipsec_netlink and + * radij tree unloading. + * + * Revision 1.1 1998/04/09 03:05:55 henry + * sources moved up from linux/net/ipsec + * + * Revision 1.1.1.1 1998/04/08 05:35:02 henry + * RGB's ipsec-0.8pre2.tar.gz ipsec-0.8 + * + * Revision 0.4 1997/01/15 01:28:15 ji + * Added definitions for new AH transforms. + * + * Revision 0.3 1996/11/20 14:35:48 ji + * Minor Cleanup. + * Rationalized debugging code. + * + * Revision 0.2 1996/11/02 00:18:33 ji + * First limited release. + * + * + */ |