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_MAXHASHLEN (SHA2_512_HASH_LEN/2) /* Keep this updated */ 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 /* Cache those two for enc(4) in xform_ipip. */ 62 u_int8_t alg_auth; 63 u_int8_t alg_enc; 64 }; 65 66 /* 67 * Opaque data structure hung off a crypto operation descriptor. 68 */ 69 struct tdb_crypto { 70 struct ipsecrequest *tc_isr; /* ipsec request state */ 71 u_int32_t tc_spi; /* associated SPI */ 72 union sockaddr_union tc_dst; /* dst addr of packet */ 73 u_int8_t tc_proto; /* current protocol, e.g. AH */ 74 u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */ 75 int tc_protoff; /* current protocol offset */ 76 int tc_skip; /* data offset */ 77 caddr_t tc_ptr; /* associated crypto data */ 78 }; 79 80 struct secasvar; 81 struct ipescrequest; 82 83 struct xformsw { 84 u_short xf_type; /* xform ID */ 85 #define XF_IP4 1 /* IP inside IP */ 86 #define XF_AH 2 /* AH */ 87 #define XF_ESP 3 /* ESP */ 88 #define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */ 89 #define XF_IPCOMP 6 /* IPCOMP */ 90 u_short xf_flags; 91 #define XFT_AUTH 0x0001 92 #define XFT_CONF 0x0100 93 #define XFT_COMP 0x1000 94 char *xf_name; /* human-readable name */ 95 int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */ 96 int (*xf_zeroize)(struct secasvar*); /* cleanup */ 97 int (*xf_input)(struct mbuf*, struct secasvar*, /* input */ 98 int, int); 99 int (*xf_output)(struct mbuf*, /* output */ 100 struct ipsecrequest *, struct mbuf **, int, int); 101 struct xformsw *xf_next; /* list of registered xforms */ 102 }; 103 104 #ifdef _KERNEL 105 extern void xform_register(struct xformsw*); 106 extern int xform_init(struct secasvar *sav, int xftype); 107 108 struct cryptoini; 109 110 /* XF_IP4 */ 111 extern int ip4_input6(struct mbuf **m, int *offp, int proto); 112 extern void ip4_input(struct mbuf *m, int); 113 extern int ipip_output(struct mbuf *, struct ipsecrequest *, 114 struct mbuf **, int, int); 115 116 /* XF_AH */ 117 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *); 118 extern int ah_zeroize(struct secasvar *sav); 119 extern struct auth_hash *ah_algorithm_lookup(int alg); 120 extern size_t ah_hdrsiz(struct secasvar *); 121 122 /* XF_ESP */ 123 extern struct enc_xform *esp_algorithm_lookup(int alg); 124 extern size_t esp_hdrsiz(struct secasvar *sav); 125 126 /* XF_COMP */ 127 extern struct comp_algo *ipcomp_algorithm_lookup(int alg); 128 129 #endif /* _KERNEL */ 130 #endif /* _NETIPSEC_XFORM_H_ */ 131