1/* $FreeBSD$ */ 2/* $KAME: keydb.h,v 1.14 2000/08/02 17:58:26 sakane Exp $ */ 3 4/*- 5 * SPDX-License-Identifier: BSD-3-Clause 6 * 7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#ifndef _NETIPSEC_KEYDB_H_ 36#define _NETIPSEC_KEYDB_H_ 37 38#ifdef _KERNEL 39#include <sys/counter.h> 40#include <sys/lock.h> 41#include <sys/mutex.h> 42 43#include <netipsec/key_var.h> 44#include <opencrypto/_cryptodev.h> 45 46#ifndef _SOCKADDR_UNION_DEFINED 47#define _SOCKADDR_UNION_DEFINED 48/* 49 * The union of all possible address formats we handle. 50 */ 51union sockaddr_union { 52 struct sockaddr sa; 53 struct sockaddr_in sin; 54 struct sockaddr_in6 sin6; 55}; 56#endif /* _SOCKADDR_UNION_DEFINED */ 57 58/* Security Assocciation Index */ 59/* NOTE: Ensure to be same address family */ 60struct secasindex { 61 union sockaddr_union src; /* source address for SA */ 62 union sockaddr_union dst; /* destination address for SA */ 63 uint8_t proto; /* IPPROTO_ESP or IPPROTO_AH */ 64 uint8_t mode; /* mode of protocol, see ipsec.h */ 65 uint32_t reqid; /* reqid id who owned this SA */ 66 /* see IPSEC_MANUAL_REQID_MAX. */ 67}; 68 69/* 70 * In order to split out the keydb implementation from that of the 71 * PF_KEY sockets we need to define a few structures that while they 72 * may seem common are likely to diverge over time. 73 */ 74 75/* sadb_identity */ 76struct secident { 77 u_int16_t type; 78 u_int64_t id; 79}; 80 81/* sadb_key */ 82struct seckey { 83 u_int16_t bits; 84 char *key_data; 85}; 86 87struct seclifetime { 88 u_int32_t allocations; 89 u_int64_t bytes; 90 u_int64_t addtime; 91 u_int64_t usetime; 92}; 93 94struct secnatt { 95 union sockaddr_union oai; /* original addresses of initiator */ 96 union sockaddr_union oar; /* original address of responder */ 97 uint16_t sport; /* source port */ 98 uint16_t dport; /* destination port */ 99 uint16_t cksum; /* checksum delta */ 100 uint16_t flags; 101#define IPSEC_NATT_F_OAI 0x0001 102#define IPSEC_NATT_F_OAR 0x0002 103}; 104 105/* Security Association Data Base */ 106TAILQ_HEAD(secasvar_queue, secasvar); 107struct secashead { 108 TAILQ_ENTRY(secashead) chain; 109 LIST_ENTRY(secashead) addrhash; /* hash by sproto+src+dst addresses */ 110 LIST_ENTRY(secashead) drainq; /* used ONLY by flush callout */ 111 112 struct secasindex saidx; 113 114 struct secident *idents; /* source identity */ 115 struct secident *identd; /* destination identity */ 116 /* XXX I don't know how to use them. */ 117 118 volatile u_int refcnt; /* reference count */ 119 uint8_t state; /* MATURE or DEAD. */ 120 struct secasvar_queue savtree_alive; /* MATURE and DYING SA */ 121 struct secasvar_queue savtree_larval; /* LARVAL SA */ 122}; 123 124struct xformsw; 125struct enc_xform; 126struct auth_hash; 127struct comp_algo; 128 129/* 130 * Security Association 131 * 132 * For INBOUND packets we do SA lookup using SPI, thus only SPIHASH is used. 133 * For OUTBOUND packets there may be several SA suitable for packet. 134 * We use key_preferred_oldsa variable to choose better SA. First of we do 135 * lookup for suitable SAH using packet's saidx. Then we use SAH's savtree 136 * to search better candidate. The newer SA (by created time) are placed 137 * in the beginning of the savtree list. There is no preference between 138 * DYING and MATURE. 139 * 140 * NB: Fields with a tdb_ prefix are part of the "glue" used 141 * to interface to the OpenBSD crypto support. This was done 142 * to distinguish this code from the mainline KAME code. 143 * NB: Fields are sorted on the basis of the frequency of changes, i.e. 144 * constants and unchangeable fields are going first. 145 * NB: if you want to change this structure, check that this will not break 146 * key_updateaddresses(). 147 */ 148struct secasvar { 149 uint32_t spi; /* SPI Value, network byte order */ 150 uint32_t flags; /* holder for SADB_KEY_FLAGS */ 151 uint32_t seq; /* sequence number */ 152 pid_t pid; /* message's pid */ 153 u_int ivlen; /* length of IV */ 154 155 struct secashead *sah; /* back pointer to the secashead */ 156 struct seckey *key_auth; /* Key for Authentication */ 157 struct seckey *key_enc; /* Key for Encryption */ 158 struct secreplay *replay; /* replay prevention */ 159 struct secnatt *natt; /* NAT-T config */ 160 struct mtx *lock; /* update/access lock */ 161 162 const struct xformsw *tdb_xform; /* transform */ 163 const struct enc_xform *tdb_encalgxform;/* encoding algorithm */ 164 const struct auth_hash *tdb_authalgxform;/* authentication algorithm */ 165 const struct comp_algo *tdb_compalgxform;/* compression algorithm */ 166 crypto_session_t tdb_cryptoid; /* crypto session */ 167 168 uint8_t alg_auth; /* Authentication Algorithm Identifier*/ 169 uint8_t alg_enc; /* Cipher Algorithm Identifier */ 170 uint8_t alg_comp; /* Compression Algorithm Identifier */ 171 uint8_t state; /* Status of this SA (pfkeyv2.h) */ 172 173 counter_u64_t lft_c; /* CURRENT lifetime */ 174#define lft_c_allocations lft_c 175#define lft_c_bytes lft_c + 1 176 struct seclifetime *lft_h; /* HARD lifetime */ 177 struct seclifetime *lft_s; /* SOFT lifetime */ 178 179 uint64_t created; /* time when SA was created */ 180 uint64_t firstused; /* time when SA was first used */ 181 182 TAILQ_ENTRY(secasvar) chain; 183 LIST_ENTRY(secasvar) spihash; 184 LIST_ENTRY(secasvar) drainq; /* used ONLY by flush callout */ 185 186 uint64_t cntr; /* counter for GCM and CTR */ 187 volatile u_int refcnt; /* reference count */ 188}; 189 190#define SECASVAR_LOCK(_sav) mtx_lock((_sav)->lock) 191#define SECASVAR_UNLOCK(_sav) mtx_unlock((_sav)->lock) 192#define SECASVAR_LOCK_ASSERT(_sav) mtx_assert((_sav)->lock, MA_OWNED) 193#define SAV_ISGCM(_sav) \ 194 ((_sav)->alg_enc == SADB_X_EALG_AESGCM8 || \ 195 (_sav)->alg_enc == SADB_X_EALG_AESGCM12 || \ 196 (_sav)->alg_enc == SADB_X_EALG_AESGCM16) 197#define SAV_ISCTR(_sav) ((_sav)->alg_enc == SADB_X_EALG_AESCTR) 198#define SAV_ISCTRORGCM(_sav) (SAV_ISCTR((_sav)) || SAV_ISGCM((_sav))) 199 200/* Replay prevention, protected by SECASVAR_LOCK: 201 * (m) locked by mtx 202 * (c) read only except during creation / free 203 */ 204struct secreplay { 205 u_int32_t count; /* (m) */ 206 u_int wsize; /* (c) window size, i.g. 4 bytes */ 207 u_int32_t seq; /* (m) used by sender */ 208 u_int32_t lastseq; /* (m) used by receiver */ 209 u_int32_t *bitmap; /* (m) used by receiver */ 210 u_int bitmap_size; /* (c) size of the bitmap array */ 211 int overflow; /* (m) overflow flag */ 212}; 213 214/* socket table due to send PF_KEY messages. */ 215struct secreg { 216 LIST_ENTRY(secreg) chain; 217 218 struct socket *so; 219}; 220 221/* acquiring list table. */ 222struct secacq { 223 LIST_ENTRY(secacq) chain; 224 LIST_ENTRY(secacq) addrhash; 225 LIST_ENTRY(secacq) seqhash; 226 227 struct secasindex saidx; 228 uint32_t seq; /* sequence number */ 229 time_t created; /* for lifetime */ 230 int count; /* for lifetime */ 231}; 232 233#endif /* _KERNEL */ 234 235#endif /* _NETIPSEC_KEYDB_H_ */ 236