1 /* $FreeBSD$ */ 2 /* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */ 3 /*- 4 * The authors of this code are John Ioannidis (ji@tla.org), 5 * Angelos D. Keromytis (kermit@csd.uch.gr), 6 * Niels Provos (provos@physnet.uni-hamburg.de) and 7 * Niklas Hallqvist (niklas@appli.se). 8 * 9 * The original version of this code was written by John Ioannidis 10 * for BSD/OS in Athens, Greece, in November 1995. 11 * 12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 13 * by Angelos D. Keromytis. 14 * 15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 16 * and Niels Provos. 17 * 18 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist. 19 * 20 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 21 * Angelos D. Keromytis and Niels Provos. 22 * Copyright (c) 1999 Niklas Hallqvist. 23 * Copyright (c) 2001, Angelos D. Keromytis. 24 * 25 * Permission to use, copy, and modify this software with or without fee 26 * is hereby granted, provided that this entire notice is included in 27 * all copies of any software which is or includes a copy or 28 * modification of this software. 29 * You may use this code under the GNU public license if you so wish. Please 30 * contribute changes back to the authors under this freer than GPL license 31 * so that we may further the use of strong encryption without limitations to 32 * all. 33 * 34 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 35 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 36 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 37 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 38 * PURPOSE. 39 */ 40 41 #ifndef _NETIPSEC_XFORM_H_ 42 #define _NETIPSEC_XFORM_H_ 43 44 #include <sys/types.h> 45 #include <netinet/in.h> 46 #include <opencrypto/xform.h> 47 48 #define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */ 49 #define AH_HMAC_INITIAL_RPL 1 /* replay counter initial value */ 50 51 /* 52 * Packet tag assigned on completion of IPsec processing; used 53 * to speedup processing when/if the packet comes back for more 54 * processing. 55 */ 56 struct tdb_ident { 57 u_int32_t spi; 58 union sockaddr_union dst; 59 u_int8_t proto; 60 /* Cache those two for enc(4) in xform_ipip. */ 61 u_int8_t alg_auth; 62 u_int8_t alg_enc; 63 }; 64 65 /* 66 * Opaque data structure hung off a crypto operation descriptor. 67 */ 68 struct tdb_crypto { 69 struct ipsecrequest *tc_isr; /* ipsec request state */ 70 u_int32_t tc_spi; /* associated SPI */ 71 union sockaddr_union tc_dst; /* dst addr of packet */ 72 u_int8_t tc_proto; /* current protocol, e.g. AH */ 73 u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */ 74 int tc_protoff; /* current protocol offset */ 75 int tc_skip; /* data offset */ 76 caddr_t tc_ptr; /* associated crypto data */ 77 }; 78 79 struct secasvar; 80 struct ipescrequest; 81 82 struct xformsw { 83 u_short xf_type; /* xform ID */ 84 #define XF_IP4 1 /* IP inside IP */ 85 #define XF_AH 2 /* AH */ 86 #define XF_ESP 3 /* ESP */ 87 #define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */ 88 #define XF_IPCOMP 6 /* IPCOMP */ 89 u_short xf_flags; 90 #define XFT_AUTH 0x0001 91 #define XFT_CONF 0x0100 92 #define XFT_COMP 0x1000 93 char *xf_name; /* human-readable name */ 94 int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */ 95 int (*xf_zeroize)(struct secasvar*); /* cleanup */ 96 int (*xf_input)(struct mbuf*, struct secasvar*, /* input */ 97 int, int); 98 int (*xf_output)(struct mbuf*, /* output */ 99 struct ipsecrequest *, struct mbuf **, int, int); 100 struct xformsw *xf_next; /* list of registered xforms */ 101 }; 102 103 #ifdef _KERNEL 104 extern void xform_register(struct xformsw*); 105 extern int xform_init(struct secasvar *sav, int xftype); 106 107 struct cryptoini; 108 109 /* XF_IP4 */ 110 extern int ip4_input6(struct mbuf **m, int *offp, int proto); 111 extern void ip4_input(struct mbuf *m, int); 112 extern int ipip_output(struct mbuf *, struct ipsecrequest *, 113 struct mbuf **, int, int); 114 115 /* XF_AH */ 116 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *); 117 extern int ah_zeroize(struct secasvar *sav); 118 extern struct auth_hash *ah_algorithm_lookup(int alg); 119 extern size_t ah_hdrsiz(struct secasvar *); 120 121 /* XF_ESP */ 122 extern struct enc_xform *esp_algorithm_lookup(int alg); 123 extern size_t esp_hdrsiz(struct secasvar *sav); 124 125 /* XF_COMP */ 126 extern struct comp_algo *ipcomp_algorithm_lookup(int alg); 127 128 #endif /* _KERNEL */ 129 #endif /* _NETIPSEC_XFORM_H_ */ 130