1 /* $NetBSD: xform.h,v 1.4 2007/03/04 06:03:30 christos Exp $ */ 2 /* $FreeBSD: src/sys/netipsec/xform.h,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $ */ 3 /* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */ 4 /* 5 * The authors of this code are John Ioannidis (ji@tla.org), 6 * Angelos D. Keromytis (kermit@csd.uch.gr), 7 * Niels Provos (provos@physnet.uni-hamburg.de) and 8 * Niklas Hallqvist (niklas@appli.se). 9 * 10 * The original version of this code was written by John Ioannidis 11 * for BSD/OS in Athens, Greece, in November 1995. 12 * 13 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 14 * by Angelos D. Keromytis. 15 * 16 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 17 * and Niels Provos. 18 * 19 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist. 20 * 21 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 22 * Angelos D. Keromytis and Niels Provos. 23 * Copyright (c) 1999 Niklas Hallqvist. 24 * Copyright (c) 2001, Angelos D. Keromytis. 25 * 26 * Permission to use, copy, and modify this software with or without fee 27 * is hereby granted, provided that this entire notice is included in 28 * all copies of any software which is or includes a copy or 29 * modification of this software. 30 * You may use this code under the GNU public license if you so wish. Please 31 * contribute changes back to the authors under this freer than GPL license 32 * so that we may further the use of strong encryption without limitations to 33 * all. 34 * 35 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 36 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 37 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 38 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 39 * PURPOSE. 40 */ 41 42 #ifndef _NETIPSEC_XFORM_H_ 43 #define _NETIPSEC_XFORM_H_ 44 45 #include <sys/types.h> 46 #include <netinet/in.h> 47 #include <opencrypto/xform.h> 48 49 #define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */ 50 #define AH_HMAC_INITIAL_RPL 1 /* replay counter initial value */ 51 52 /* 53 * Packet tag assigned on completion of IPsec processing; used 54 * to speedup processing when/if the packet comes back for more 55 * processing. 56 */ 57 struct tdb_ident { 58 u_int32_t spi; 59 union sockaddr_union dst; 60 u_int8_t proto; 61 }; 62 63 /* 64 * Opaque data structure hung off a crypto operation descriptor. 65 */ 66 struct tdb_crypto { 67 struct ipsecrequest *tc_isr; /* ipsec request state */ 68 u_int32_t tc_spi; /* associated SPI */ 69 union sockaddr_union tc_dst; /* dst addr of packet */ 70 u_int8_t tc_proto; /* current protocol, e.g. AH */ 71 u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */ 72 int tc_protoff; /* current protocol offset */ 73 int tc_skip; /* data offset */ 74 void * tc_ptr; /* associated crypto data */ 75 }; 76 77 struct secasvar; 78 struct ipescrequest; 79 80 struct xformsw { 81 u_short xf_type; /* xform ID */ 82 #define XF_IP4 1 /* IP inside IP */ 83 #define XF_AH 2 /* AH */ 84 #define XF_ESP 3 /* ESP */ 85 #define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */ 86 #define XF_IPCOMP 6 /* IPCOMP */ 87 u_short xf_flags; 88 #define XFT_AUTH 0x0001 89 #define XFT_CONF 0x0100 90 #define XFT_COMP 0x1000 91 const char *xf_name; /* human-readable name */ 92 int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */ 93 int (*xf_zeroize)(struct secasvar*); /* cleanup */ 94 int (*xf_input)(struct mbuf*, struct secasvar*, /* input */ 95 int, int); 96 int (*xf_output)(struct mbuf*, /* output */ 97 struct ipsecrequest *, struct mbuf **, int, int); 98 struct xformsw *xf_next; /* list of registered xforms */ 99 }; 100 101 #ifdef _KERNEL 102 extern void xform_register(struct xformsw*); 103 extern int xform_init(struct secasvar *sav, int xftype); 104 105 struct cryptoini; 106 107 /* XF_IP4 */ 108 extern int ip4_input6(struct mbuf **m, int *offp, int proto); 109 extern void ip4_input(struct mbuf *m, ...); 110 extern int ipip_output(struct mbuf *, struct ipsecrequest *, 111 struct mbuf **, int, int); 112 113 /* XF_AH */ 114 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *); 115 extern int ah_zeroize(struct secasvar *sav); 116 extern struct auth_hash *ah_algorithm_lookup(int alg); 117 extern size_t ah_hdrsiz(struct secasvar *); 118 119 /* XF_ESP */ 120 extern struct enc_xform *esp_algorithm_lookup(int alg); 121 extern size_t esp_hdrsiz(struct secasvar *sav); 122 123 /* XF_COMP */ 124 extern struct comp_algo *ipcomp_algorithm_lookup(int alg); 125 126 #endif /* _KERNEL */ 127 #endif /* !_NETIPSEC_XFORM_H_ */ 128