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 #include <sys/rmlock.h> 43 44 #include <netipsec/key_var.h> 45 #include <opencrypto/_cryptodev.h> 46 47 #ifndef _SOCKADDR_UNION_DEFINED 48 #define _SOCKADDR_UNION_DEFINED 49 /* 50 * The union of all possible address formats we handle. 51 */ 52 union sockaddr_union { 53 struct sockaddr sa; 54 struct sockaddr_in sin; 55 struct sockaddr_in6 sin6; 56 }; 57 #endif /* _SOCKADDR_UNION_DEFINED */ 58 59 /* Security Association Index */ 60 /* NOTE: Ensure to be same address family */ 61 struct secasindex { 62 union sockaddr_union src; /* source address for SA */ 63 union sockaddr_union dst; /* destination address for SA */ 64 uint8_t proto; /* IPPROTO_ESP or IPPROTO_AH */ 65 uint8_t mode; /* mode of protocol, see ipsec.h */ 66 uint32_t reqid; /* reqid id who owned this SA */ 67 /* see IPSEC_MANUAL_REQID_MAX. */ 68 }; 69 70 /* 71 * In order to split out the keydb implementation from that of the 72 * PF_KEY sockets we need to define a few structures that while they 73 * may seem common are likely to diverge over time. 74 */ 75 76 /* sadb_identity */ 77 struct secident { 78 u_int16_t type; 79 u_int64_t id; 80 }; 81 82 /* sadb_key */ 83 struct seckey { 84 u_int16_t bits; 85 char *key_data; 86 }; 87 88 struct seclifetime { 89 u_int32_t allocations; 90 u_int64_t bytes; 91 u_int64_t addtime; 92 u_int64_t usetime; 93 }; 94 95 struct secnatt { 96 union sockaddr_union oai; /* original addresses of initiator */ 97 union sockaddr_union oar; /* original address of responder */ 98 uint16_t sport; /* source port */ 99 uint16_t dport; /* destination port */ 100 uint16_t cksum; /* checksum delta */ 101 uint16_t flags; 102 #define IPSEC_NATT_F_OAI 0x0001 103 #define IPSEC_NATT_F_OAR 0x0002 104 }; 105 106 /* Security Association Data Base */ 107 TAILQ_HEAD(secasvar_queue, secasvar); 108 struct secashead { 109 TAILQ_ENTRY(secashead) chain; 110 LIST_ENTRY(secashead) addrhash; /* hash by sproto+src+dst addresses */ 111 LIST_ENTRY(secashead) drainq; /* used ONLY by flush callout */ 112 113 struct secasindex saidx; 114 115 struct secident *idents; /* source identity */ 116 struct secident *identd; /* destination identity */ 117 /* XXX I don't know how to use them. */ 118 119 volatile u_int refcnt; /* reference count */ 120 uint8_t state; /* MATURE or DEAD. */ 121 struct secasvar_queue savtree_alive; /* MATURE and DYING SA */ 122 struct secasvar_queue savtree_larval; /* LARVAL SA */ 123 }; 124 125 struct xformsw; 126 struct enc_xform; 127 struct auth_hash; 128 struct comp_algo; 129 130 /* 131 * Security Association 132 * 133 * For INBOUND packets we do SA lookup using SPI, thus only SPIHASH is used. 134 * For OUTBOUND packets there may be several SA suitable for packet. 135 * We use key_preferred_oldsa variable to choose better SA. First of we do 136 * lookup for suitable SAH using packet's saidx. Then we use SAH's savtree 137 * to search better candidate. The newer SA (by created time) are placed 138 * in the beginning of the savtree list. There is no preference between 139 * DYING and MATURE. 140 * 141 * NB: Fields with a tdb_ prefix are part of the "glue" used 142 * to interface to the OpenBSD crypto support. This was done 143 * to distinguish this code from the mainline KAME code. 144 * NB: Fields are sorted on the basis of the frequency of changes, i.e. 145 * constants and unchangeable fields are going first. 146 * NB: if you want to change this structure, check that this will not break 147 * key_updateaddresses(). 148 */ 149 struct secasvar { 150 uint32_t spi; /* SPI Value, network byte order */ 151 uint32_t flags; /* holder for SADB_KEY_FLAGS */ 152 uint32_t seq; /* sequence number */ 153 pid_t pid; /* message's pid */ 154 u_int ivlen; /* length of IV */ 155 156 struct secashead *sah; /* back pointer to the secashead */ 157 struct seckey *key_auth; /* Key for Authentication */ 158 struct seckey *key_enc; /* Key for Encryption */ 159 struct secreplay *replay; /* replay prevention */ 160 struct secnatt *natt; /* NAT-T config */ 161 struct rmlock *lock; /* update/access lock */ 162 163 const struct xformsw *tdb_xform; /* transform */ 164 const struct enc_xform *tdb_encalgxform;/* encoding algorithm */ 165 const struct auth_hash *tdb_authalgxform;/* authentication algorithm */ 166 const struct comp_algo *tdb_compalgxform;/* compression algorithm */ 167 crypto_session_t tdb_cryptoid; /* crypto session */ 168 169 uint8_t alg_auth; /* Authentication Algorithm Identifier*/ 170 uint8_t alg_enc; /* Cipher Algorithm Identifier */ 171 uint8_t alg_comp; /* Compression Algorithm Identifier */ 172 uint8_t state; /* Status of this SA (pfkeyv2.h) */ 173 174 counter_u64_t lft_c; /* CURRENT lifetime */ 175 #define lft_c_allocations lft_c 176 #define lft_c_bytes lft_c + 1 177 struct seclifetime *lft_h; /* HARD lifetime */ 178 struct seclifetime *lft_s; /* SOFT lifetime */ 179 180 uint64_t created; /* time when SA was created */ 181 uint64_t firstused; /* time when SA was first used */ 182 183 TAILQ_ENTRY(secasvar) chain; 184 LIST_ENTRY(secasvar) spihash; 185 LIST_ENTRY(secasvar) drainq; /* used ONLY by flush callout */ 186 187 uint64_t cntr; /* counter for GCM and CTR */ 188 volatile u_int refcnt; /* reference count */ 189 }; 190 191 #define SECASVAR_RLOCK_TRACKER struct rm_priotracker _secas_tracker 192 #define SECASVAR_RLOCK(_sav) rm_rlock((_sav)->lock, &_secas_tracker) 193 #define SECASVAR_RUNLOCK(_sav) rm_runlock((_sav)->lock, &_secas_tracker) 194 #define SECASVAR_WLOCK(_sav) rm_wlock((_sav)->lock) 195 #define SECASVAR_WUNLOCK(_sav) rm_wunlock((_sav)->lock) 196 #define SECASVAR_LOCK_ASSERT(_sav) rm_assert((_sav)->lock, RA_LOCKED) 197 #define SECASVAR_LOCK_WASSERT(_sav) rm_assert((_sav)->lock, RA_WLOCKED) 198 #define SAV_ISGCM(_sav) \ 199 ((_sav)->alg_enc == SADB_X_EALG_AESGCM8 || \ 200 (_sav)->alg_enc == SADB_X_EALG_AESGCM12 || \ 201 (_sav)->alg_enc == SADB_X_EALG_AESGCM16) 202 #define SAV_ISCTR(_sav) ((_sav)->alg_enc == SADB_X_EALG_AESCTR) 203 #define SAV_ISCTRORGCM(_sav) (SAV_ISCTR((_sav)) || SAV_ISGCM((_sav))) 204 205 #define IPSEC_SEQH_SHIFT 32 206 207 /* Replay prevention, protected by SECASVAR_LOCK: 208 * (m) locked by mtx 209 * (c) read only except during creation / free 210 */ 211 struct secreplay { 212 struct mtx lock; 213 u_int64_t count; /* (m) */ 214 u_int wsize; /* (c) window size, i.g. 4 bytes */ 215 u_int64_t last; /* (m) used by receiver */ 216 u_int32_t *bitmap; /* (m) used by receiver */ 217 u_int bitmap_size; /* (c) size of the bitmap array */ 218 int overflow; /* (m) overflow flag */ 219 }; 220 221 #define SECREPLAY_LOCK(_r) mtx_lock(&(_r)->lock) 222 #define SECREPLAY_UNLOCK(_r) mtx_unlock(&(_r)->lock) 223 #define SECREPLAY_ASSERT(_r) mtx_assert(&(_r)->lock, MA_OWNED) 224 225 /* socket table due to send PF_KEY messages. */ 226 struct secreg { 227 LIST_ENTRY(secreg) chain; 228 229 struct socket *so; 230 }; 231 232 /* acquiring list table. */ 233 struct secacq { 234 LIST_ENTRY(secacq) chain; 235 LIST_ENTRY(secacq) addrhash; 236 LIST_ENTRY(secacq) seqhash; 237 238 struct secasindex saidx; 239 uint32_t seq; /* sequence number */ 240 time_t created; /* for lifetime */ 241 int count; /* for lifetime */ 242 }; 243 244 #endif /* _KERNEL */ 245 246 #endif /* _NETIPSEC_KEYDB_H_ */ 247