1 /* $KAME: keydb.h,v 1.14 2000/08/02 17:58:26 sakane Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef _NETIPSEC_KEYDB_H_ 35 #define _NETIPSEC_KEYDB_H_ 36 37 #ifdef _KERNEL 38 #include <sys/counter.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/rmlock.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 */ 51 union 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 Association Index */ 59 /* NOTE: Ensure to be same address family */ 60 struct 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 */ 76 struct secident { 77 u_int16_t type; 78 u_int64_t id; 79 }; 80 81 /* sadb_key */ 82 struct seckey { 83 u_int16_t bits; 84 char *key_data; 85 }; 86 87 struct seclifetime { 88 u_int32_t allocations; 89 u_int64_t bytes; 90 u_int64_t addtime; 91 u_int64_t usetime; 92 }; 93 94 struct 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 */ 106 TAILQ_HEAD(secasvar_queue, secasvar); 107 struct 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 }; 123 124 struct xformsw; 125 struct enc_xform; 126 struct auth_hash; 127 struct 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 */ 148 struct 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 rmlock *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_RLOCK_TRACKER struct rm_priotracker _secas_tracker 191 #define SECASVAR_RLOCK(_sav) rm_rlock((_sav)->lock, &_secas_tracker) 192 #define SECASVAR_RUNLOCK(_sav) rm_runlock((_sav)->lock, &_secas_tracker) 193 #define SECASVAR_WLOCK(_sav) rm_wlock((_sav)->lock) 194 #define SECASVAR_WUNLOCK(_sav) rm_wunlock((_sav)->lock) 195 #define SECASVAR_LOCK_ASSERT(_sav) rm_assert((_sav)->lock, RA_LOCKED) 196 #define SECASVAR_LOCK_WASSERT(_sav) rm_assert((_sav)->lock, RA_WLOCKED) 197 #define SAV_ISGCM(_sav) \ 198 ((_sav)->alg_enc == SADB_X_EALG_AESGCM8 || \ 199 (_sav)->alg_enc == SADB_X_EALG_AESGCM12 || \ 200 (_sav)->alg_enc == SADB_X_EALG_AESGCM16) 201 #define SAV_ISCTR(_sav) ((_sav)->alg_enc == SADB_X_EALG_AESCTR) 202 #define SAV_ISCHACHA(_sav) \ 203 ((_sav)->alg_enc == SADB_X_EALG_CHACHA20POLY1305) 204 #define SAV_ISCTRORGCM(_sav) (SAV_ISCTR((_sav)) || SAV_ISGCM((_sav))) 205 206 #define IPSEC_SEQH_SHIFT 32 207 208 /* Replay prevention, protected by SECASVAR_LOCK: 209 * (m) locked by mtx 210 * (c) read only except during creation / free 211 */ 212 struct secreplay { 213 struct mtx lock; 214 u_int64_t count; /* (m) */ 215 u_int wsize; /* (c) window size, i.g. 4 bytes */ 216 u_int64_t last; /* (m) used by receiver */ 217 u_int32_t *bitmap; /* (m) used by receiver */ 218 u_int bitmap_size; /* (c) size of the bitmap array */ 219 int overflow; /* (m) overflow flag */ 220 }; 221 222 #define SECREPLAY_LOCK(_r) mtx_lock(&(_r)->lock) 223 #define SECREPLAY_UNLOCK(_r) mtx_unlock(&(_r)->lock) 224 #define SECREPLAY_ASSERT(_r) mtx_assert(&(_r)->lock, MA_OWNED) 225 226 /* socket table due to send PF_KEY messages. */ 227 struct secreg { 228 LIST_ENTRY(secreg) chain; 229 230 struct socket *so; 231 }; 232 233 /* acquiring list table. */ 234 struct secacq { 235 LIST_ENTRY(secacq) chain; 236 LIST_ENTRY(secacq) addrhash; 237 LIST_ENTRY(secacq) seqhash; 238 239 struct secasindex saidx; 240 uint32_t seq; /* sequence number */ 241 time_t created; /* for lifetime */ 242 int count; /* for lifetime */ 243 }; 244 245 #endif /* _KERNEL */ 246 247 #endif /* _NETIPSEC_KEYDB_H_ */ 248