1 /* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */ 2 /*- 3 * The authors of this code are John Ioannidis (ji@tla.org), 4 * Angelos D. Keromytis (kermit@csd.uch.gr), 5 * Niels Provos (provos@physnet.uni-hamburg.de) and 6 * Niklas Hallqvist (niklas@appli.se). 7 * 8 * The original version of this code was written by John Ioannidis 9 * for BSD/OS in Athens, Greece, in November 1995. 10 * 11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 12 * by Angelos D. Keromytis. 13 * 14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 15 * and Niels Provos. 16 * 17 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist. 18 * 19 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 20 * Angelos D. Keromytis and Niels Provos. 21 * Copyright (c) 1999 Niklas Hallqvist. 22 * Copyright (c) 2001, Angelos D. Keromytis. 23 * 24 * Permission to use, copy, and modify this software with or without fee 25 * is hereby granted, provided that this entire notice is included in 26 * all copies of any software which is or includes a copy or 27 * modification of this software. 28 * You may use this code under the GNU public license if you so wish. Please 29 * contribute changes back to the authors under this freer than GPL license 30 * so that we may further the use of strong encryption without limitations to 31 * all. 32 * 33 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 34 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 35 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 36 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 37 * PURPOSE. 38 */ 39 40 #ifndef _NETIPSEC_XFORM_H_ 41 #define _NETIPSEC_XFORM_H_ 42 43 #include <sys/types.h> 44 #include <sys/queue.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 #ifdef _KERNEL 53 struct secpolicy; 54 struct secasvar; 55 56 /* 57 * Packet tag assigned on completion of IPsec processing; used 58 * to speedup security policy checking for INBOUND packets. 59 */ 60 struct xform_history { 61 union sockaddr_union dst; /* destination address */ 62 uint32_t spi; /* Security Parameters Index */ 63 uint8_t proto; /* IPPROTO_ESP or IPPROTO_AH */ 64 uint8_t mode; /* transport or tunnel */ 65 }; 66 67 /* 68 * Opaque data structure hung off a crypto operation descriptor. 69 */ 70 struct xform_data { 71 struct secpolicy *sp; /* security policy */ 72 struct secasvar *sav; /* related SA */ 73 crypto_session_t cryptoid; /* used crypto session */ 74 u_int idx; /* IPsec request index */ 75 int protoff; /* current protocol offset */ 76 int skip; /* data offset */ 77 uint8_t nxt; /* next protocol, e.g. IPV4 */ 78 struct vnet *vnet; 79 }; 80 81 #define XF_IP4 1 /* unused */ 82 #define XF_AH 2 /* AH */ 83 #define XF_ESP 3 /* ESP */ 84 #define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */ 85 #define XF_IPCOMP 6 /* IPCOMP */ 86 87 struct xformsw { 88 u_short xf_type; /* xform ID */ 89 const char *xf_name; /* human-readable name */ 90 int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */ 91 void (*xf_cleanup)(struct secasvar*); /* cleanup */ 92 int (*xf_input)(struct mbuf*, struct secasvar*, /* input */ 93 int, int); 94 int (*xf_output)(struct mbuf*, /* output */ 95 struct secpolicy *, struct secasvar *, u_int, int, int); 96 97 volatile u_int xf_cntr; 98 LIST_ENTRY(xformsw) chain; 99 }; 100 101 const struct enc_xform * enc_algorithm_lookup(int); 102 const struct auth_hash * auth_algorithm_lookup(int); 103 const struct comp_algo * comp_algorithm_lookup(int); 104 105 void xform_attach(void *); 106 void xform_detach(void *); 107 int xform_init(struct secasvar *, u_short); 108 109 struct crypto_session_params; 110 /* XF_AH */ 111 int xform_ah_authsize(const struct auth_hash *); 112 int ah_init0(struct secasvar *, struct xformsw *, 113 struct crypto_session_params *); 114 extern size_t ah_hdrsiz(struct secasvar *); 115 116 /* XF_ESP */ 117 extern size_t esp_hdrsiz(struct secasvar *sav); 118 119 #endif /* _KERNEL */ 120 #endif /* _NETIPSEC_XFORM_H_ */ 121