233 lines
7.8 KiB
C
233 lines
7.8 KiB
C
/* $FreeBSD$ */
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/* $KAME: keydb.h,v 1.14 2000/08/02 17:58:26 sakane Exp $ */
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/*-
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NETIPSEC_KEYDB_H_
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#define _NETIPSEC_KEYDB_H_
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#ifdef _KERNEL
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#include <sys/counter.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <netipsec/key_var.h>
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#ifndef _SOCKADDR_UNION_DEFINED
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#define _SOCKADDR_UNION_DEFINED
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/*
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* The union of all possible address formats we handle.
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*/
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union sockaddr_union {
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struct sockaddr sa;
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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};
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#endif /* _SOCKADDR_UNION_DEFINED */
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/* Security Assocciation Index */
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/* NOTE: Ensure to be same address family */
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struct secasindex {
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union sockaddr_union src; /* source address for SA */
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union sockaddr_union dst; /* destination address for SA */
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uint8_t proto; /* IPPROTO_ESP or IPPROTO_AH */
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uint8_t mode; /* mode of protocol, see ipsec.h */
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uint32_t reqid; /* reqid id who owned this SA */
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/* see IPSEC_MANUAL_REQID_MAX. */
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};
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/*
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* In order to split out the keydb implementation from that of the
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* PF_KEY sockets we need to define a few structures that while they
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* may seem common are likely to diverge over time.
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*/
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/* sadb_identity */
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struct secident {
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u_int16_t type;
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u_int64_t id;
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};
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/* sadb_key */
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struct seckey {
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u_int16_t bits;
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char *key_data;
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};
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struct seclifetime {
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u_int32_t allocations;
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u_int64_t bytes;
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u_int64_t addtime;
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u_int64_t usetime;
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};
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struct secnatt {
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union sockaddr_union oai; /* original addresses of initiator */
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union sockaddr_union oar; /* original address of responder */
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uint16_t sport; /* source port */
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uint16_t dport; /* destination port */
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uint16_t cksum; /* checksum delta */
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uint16_t flags;
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#define IPSEC_NATT_F_OAI 0x0001
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#define IPSEC_NATT_F_OAR 0x0002
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};
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/* Security Association Data Base */
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TAILQ_HEAD(secasvar_queue, secasvar);
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struct secashead {
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TAILQ_ENTRY(secashead) chain;
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LIST_ENTRY(secashead) addrhash; /* hash by sproto+src+dst addresses */
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LIST_ENTRY(secashead) drainq; /* used ONLY by flush callout */
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struct secasindex saidx;
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struct secident *idents; /* source identity */
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struct secident *identd; /* destination identity */
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/* XXX I don't know how to use them. */
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volatile u_int refcnt; /* reference count */
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uint8_t state; /* MATURE or DEAD. */
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struct secasvar_queue savtree_alive; /* MATURE and DYING SA */
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struct secasvar_queue savtree_larval; /* LARVAL SA */
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};
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struct xformsw;
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struct enc_xform;
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struct auth_hash;
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struct comp_algo;
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/*
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* Security Association
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*
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* For INBOUND packets we do SA lookup using SPI, thus only SPIHASH is used.
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* For OUTBOUND packets there may be several SA suitable for packet.
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* We use key_preferred_oldsa variable to choose better SA. First of we do
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* lookup for suitable SAH using packet's saidx. Then we use SAH's savtree
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* to search better candidate. The newer SA (by created time) are placed
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* in the beginning of the savtree list. There is no preference between
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* DYING and MATURE.
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*
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* NB: Fields with a tdb_ prefix are part of the "glue" used
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* to interface to the OpenBSD crypto support. This was done
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* to distinguish this code from the mainline KAME code.
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* NB: Fields are sorted on the basis of the frequency of changes, i.e.
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* constants and unchangeable fields are going first.
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* NB: if you want to change this structure, check that this will not break
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* key_updateaddresses().
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*/
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struct secasvar {
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uint32_t spi; /* SPI Value, network byte order */
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uint32_t flags; /* holder for SADB_KEY_FLAGS */
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uint32_t seq; /* sequence number */
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pid_t pid; /* message's pid */
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u_int ivlen; /* length of IV */
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struct secashead *sah; /* back pointer to the secashead */
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struct seckey *key_auth; /* Key for Authentication */
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struct seckey *key_enc; /* Key for Encryption */
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struct secreplay *replay; /* replay prevention */
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struct secnatt *natt; /* NAT-T config */
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struct mtx *lock; /* update/access lock */
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const struct xformsw *tdb_xform; /* transform */
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const struct enc_xform *tdb_encalgxform;/* encoding algorithm */
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const struct auth_hash *tdb_authalgxform;/* authentication algorithm */
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const struct comp_algo *tdb_compalgxform;/* compression algorithm */
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uint64_t tdb_cryptoid; /* crypto session id */
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uint8_t alg_auth; /* Authentication Algorithm Identifier*/
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uint8_t alg_enc; /* Cipher Algorithm Identifier */
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uint8_t alg_comp; /* Compression Algorithm Identifier */
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uint8_t state; /* Status of this SA (pfkeyv2.h) */
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counter_u64_t lft_c; /* CURRENT lifetime */
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#define lft_c_allocations lft_c
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#define lft_c_bytes lft_c + 1
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struct seclifetime *lft_h; /* HARD lifetime */
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struct seclifetime *lft_s; /* SOFT lifetime */
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uint64_t created; /* time when SA was created */
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uint64_t firstused; /* time when SA was first used */
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TAILQ_ENTRY(secasvar) chain;
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LIST_ENTRY(secasvar) spihash;
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LIST_ENTRY(secasvar) drainq; /* used ONLY by flush callout */
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uint64_t cntr; /* counter for GCM and CTR */
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volatile u_int refcnt; /* reference count */
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};
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#define SECASVAR_LOCK(_sav) mtx_lock((_sav)->lock)
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#define SECASVAR_UNLOCK(_sav) mtx_unlock((_sav)->lock)
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#define SECASVAR_LOCK_ASSERT(_sav) mtx_assert((_sav)->lock, MA_OWNED)
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#define SAV_ISGCM(_sav) \
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((_sav)->alg_enc == SADB_X_EALG_AESGCM8 || \
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(_sav)->alg_enc == SADB_X_EALG_AESGCM12 || \
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(_sav)->alg_enc == SADB_X_EALG_AESGCM16)
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#define SAV_ISCTR(_sav) ((_sav)->alg_enc == SADB_X_EALG_AESCTR)
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#define SAV_ISCTRORGCM(_sav) (SAV_ISCTR((_sav)) || SAV_ISGCM((_sav)))
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/* Replay prevention, protected by SECASVAR_LOCK:
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* (m) locked by mtx
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* (c) read only except during creation / free
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*/
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struct secreplay {
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u_int32_t count; /* (m) */
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u_int wsize; /* (c) window size, i.g. 4 bytes */
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u_int32_t seq; /* (m) used by sender */
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u_int32_t lastseq; /* (m) used by receiver */
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u_int32_t *bitmap; /* (m) used by receiver */
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u_int bitmap_size; /* (c) size of the bitmap array */
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int overflow; /* (m) overflow flag */
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};
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/* socket table due to send PF_KEY messages. */
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struct secreg {
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LIST_ENTRY(secreg) chain;
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struct socket *so;
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};
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/* acquiring list table. */
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struct secacq {
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LIST_ENTRY(secacq) chain;
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LIST_ENTRY(secacq) addrhash;
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LIST_ENTRY(secacq) seqhash;
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struct secasindex saidx;
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uint32_t seq; /* sequence number */
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time_t created; /* for lifetime */
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int count; /* for lifetime */
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};
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#endif /* _KERNEL */
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#endif /* _NETIPSEC_KEYDB_H_ */
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