374 lines
13 KiB
C
374 lines
13 KiB
C
/* $FreeBSD$ */
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/* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun 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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/*
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* IPsec controller part.
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*/
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#ifndef _NETIPSEC_IPSEC_H_
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#define _NETIPSEC_IPSEC_H_
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#if defined(_KERNEL) && !defined(_LKM) && !defined(KLD_MODULE)
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#endif
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#include <net/pfkeyv2.h>
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#include <netipsec/keydb.h>
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#ifdef _KERNEL
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/_rwlock.h>
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#define IPSEC_ASSERT(_c,_m) KASSERT(_c, _m)
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#define IPSEC_IS_PRIVILEGED_SO(_so) \
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((_so)->so_cred != NULL && \
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priv_check_cred((_so)->so_cred, PRIV_NETINET_IPSEC, 0) \
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== 0)
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/*
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* Security Policy Index
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* Ensure that both address families in the "src" and "dst" are same.
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* When the value of the ul_proto is ICMPv6, the port field in "src"
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* specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code.
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*/
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struct secpolicyindex {
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u_int8_t dir; /* direction of packet flow, see below */
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union sockaddr_union src; /* IP src address for SP */
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union sockaddr_union dst; /* IP dst address for SP */
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u_int8_t prefs; /* prefix length in bits for src */
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u_int8_t prefd; /* prefix length in bits for dst */
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u_int16_t ul_proto; /* upper layer Protocol */
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#ifdef notyet
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uid_t uids;
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uid_t uidd;
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gid_t gids;
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gid_t gidd;
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#endif
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};
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/* Security Policy Data Base */
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struct secpolicy {
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TAILQ_ENTRY(secpolicy) chain;
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struct secpolicyindex spidx; /* selector */
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struct ipsecrequest *req;
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/* pointer to the ipsec request tree, */
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/* if policy == IPSEC else this value == NULL.*/
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u_int refcnt; /* reference count */
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u_int policy; /* policy_type per pfkeyv2.h */
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u_int state;
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#define IPSEC_SPSTATE_DEAD 0
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#define IPSEC_SPSTATE_ALIVE 1
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u_int32_t priority; /* priority of this policy */
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u_int32_t id; /* It's unique number on the system. */
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/*
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* lifetime handler.
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* the policy can be used without limitiation if both lifetime and
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* validtime are zero.
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* "lifetime" is passed by sadb_lifetime.sadb_lifetime_addtime.
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* "validtime" is passed by sadb_lifetime.sadb_lifetime_usetime.
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*/
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time_t created; /* time created the policy */
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time_t lastused; /* updated every when kernel sends a packet */
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long lifetime; /* duration of the lifetime of this policy */
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long validtime; /* duration this policy is valid without use */
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};
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/* Request for IPsec */
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struct ipsecrequest {
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struct ipsecrequest *next;
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/* pointer to next structure */
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/* If NULL, it means the end of chain. */
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struct secasindex saidx;/* hint for search proper SA */
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/* if __ss_len == 0 then no address specified.*/
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u_int level; /* IPsec level defined below. */
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struct secasvar *sav; /* place holder of SA for use */
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struct secpolicy *sp; /* back pointer to SP */
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struct rwlock lock; /* to interlock updates */
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};
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/*
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* Need recursion for when crypto callbacks happen directly,
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* as in the case of software crypto. Need to look at how
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* hard it is to remove this...
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*/
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#define IPSECREQUEST_LOCK_INIT(_isr) \
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rw_init_flags(&(_isr)->lock, "ipsec request", RW_RECURSE)
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#define IPSECREQUEST_LOCK(_isr) rw_rlock(&(_isr)->lock)
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#define IPSECREQUEST_UNLOCK(_isr) rw_runlock(&(_isr)->lock)
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#define IPSECREQUEST_WLOCK(_isr) rw_wlock(&(_isr)->lock)
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#define IPSECREQUEST_WUNLOCK(_isr) rw_wunlock(&(_isr)->lock)
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#define IPSECREQUEST_UPGRADE(_isr) rw_try_upgrade(&(_isr)->lock)
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#define IPSECREQUEST_DOWNGRADE(_isr) rw_downgrade(&(_isr)->lock)
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#define IPSECREQUEST_LOCK_DESTROY(_isr) rw_destroy(&(_isr)->lock)
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#define IPSECREQUEST_LOCK_ASSERT(_isr) rw_assert(&(_isr)->lock, RA_LOCKED)
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/* security policy in PCB */
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struct inpcbpolicy {
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struct secpolicy *sp_in;
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struct secpolicy *sp_out;
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int priv; /* privileged socket ? */
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};
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/* SP acquiring list table. */
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struct secspacq {
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LIST_ENTRY(secspacq) chain;
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struct secpolicyindex spidx;
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time_t created; /* for lifetime */
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int count; /* for lifetime */
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/* XXX: here is mbuf place holder to be sent ? */
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};
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#endif /* _KERNEL */
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/* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
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#define IPSEC_PORT_ANY 0
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#define IPSEC_ULPROTO_ANY 255
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#define IPSEC_PROTO_ANY 255
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/* mode of security protocol */
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/* NOTE: DON'T use IPSEC_MODE_ANY at SPD. It's only use in SAD */
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#define IPSEC_MODE_ANY 0 /* i.e. wildcard. */
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#define IPSEC_MODE_TRANSPORT 1
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#define IPSEC_MODE_TUNNEL 2
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#define IPSEC_MODE_TCPMD5 3 /* TCP MD5 mode */
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/*
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* Direction of security policy.
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* NOTE: Since INVALID is used just as flag.
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* The other are used for loop counter too.
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*/
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#define IPSEC_DIR_ANY 0
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#define IPSEC_DIR_INBOUND 1
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#define IPSEC_DIR_OUTBOUND 2
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#define IPSEC_DIR_MAX 3
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#define IPSEC_DIR_INVALID 4
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/* Policy level */
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/*
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* IPSEC, ENTRUST and BYPASS are allowed for setsockopt() in PCB,
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* DISCARD, IPSEC and NONE are allowed for setkey() in SPD.
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* DISCARD and NONE are allowed for system default.
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*/
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#define IPSEC_POLICY_DISCARD 0 /* discarding packet */
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#define IPSEC_POLICY_NONE 1 /* through IPsec engine */
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#define IPSEC_POLICY_IPSEC 2 /* do IPsec */
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#define IPSEC_POLICY_ENTRUST 3 /* consulting SPD if present. */
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#define IPSEC_POLICY_BYPASS 4 /* only for privileged socket. */
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/* Security protocol level */
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#define IPSEC_LEVEL_DEFAULT 0 /* reference to system default */
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#define IPSEC_LEVEL_USE 1 /* use SA if present. */
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#define IPSEC_LEVEL_REQUIRE 2 /* require SA. */
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#define IPSEC_LEVEL_UNIQUE 3 /* unique SA. */
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#define IPSEC_MANUAL_REQID_MAX 0x3fff
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/*
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* if security policy level == unique, this id
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* indicate to a relative SA for use, else is
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* zero.
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* 1 - 0x3fff are reserved for manual keying.
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* 0 are reserved for above reason. Others is
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* for kernel use.
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* Note that this id doesn't identify SA
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* by only itself.
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*/
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#define IPSEC_REPLAYWSIZE 32
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/* statistics for ipsec processing */
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struct ipsecstat {
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uint64_t ips_in_polvio; /* input: sec policy violation */
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uint64_t ips_in_nomem; /* input: no memory available */
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uint64_t ips_in_inval; /* input: generic error */
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uint64_t ips_out_polvio; /* output: sec policy violation */
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uint64_t ips_out_nosa; /* output: SA unavailable */
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uint64_t ips_out_nomem; /* output: no memory available */
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uint64_t ips_out_noroute; /* output: no route available */
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uint64_t ips_out_inval; /* output: generic error */
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uint64_t ips_out_bundlesa; /* output: bundled SA processed */
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uint64_t ips_mbcoalesced; /* mbufs coalesced during clone */
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uint64_t ips_clcoalesced; /* clusters coalesced during clone */
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uint64_t ips_clcopied; /* clusters copied during clone */
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uint64_t ips_mbinserted; /* mbufs inserted during makespace */
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/*
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* Temporary statistics for performance analysis.
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*/
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/* See where ESP/AH/IPCOMP header land in mbuf on input */
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uint64_t ips_input_front;
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uint64_t ips_input_middle;
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uint64_t ips_input_end;
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};
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/*
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* Definitions for IPsec & Key sysctl operations.
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*/
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#define IPSECCTL_STATS 1 /* stats */
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#define IPSECCTL_DEF_POLICY 2
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#define IPSECCTL_DEF_ESP_TRANSLEV 3 /* int; ESP transport mode */
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#define IPSECCTL_DEF_ESP_NETLEV 4 /* int; ESP tunnel mode */
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#define IPSECCTL_DEF_AH_TRANSLEV 5 /* int; AH transport mode */
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#define IPSECCTL_DEF_AH_NETLEV 6 /* int; AH tunnel mode */
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#if 0 /* obsolete, do not reuse */
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#define IPSECCTL_INBOUND_CALL_IKE 7
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#endif
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#define IPSECCTL_AH_CLEARTOS 8
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#define IPSECCTL_AH_OFFSETMASK 9
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#define IPSECCTL_DFBIT 10
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#define IPSECCTL_ECN 11
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#define IPSECCTL_DEBUG 12
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#define IPSECCTL_ESP_RANDPAD 13
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#ifdef _KERNEL
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#include <sys/counter.h>
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struct ipsec_ctx_data;
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#define IPSEC_INIT_CTX(_ctx, _mp, _sav, _af, _enc) do { \
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(_ctx)->mp = (_mp); \
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(_ctx)->sav = (_sav); \
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(_ctx)->af = (_af); \
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(_ctx)->enc = (_enc); \
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} while(0)
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int ipsec_run_hhooks(struct ipsec_ctx_data *ctx, int direction);
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VNET_DECLARE(int, ipsec_debug);
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#define V_ipsec_debug VNET(ipsec_debug)
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#ifdef REGRESSION
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VNET_DECLARE(int, ipsec_replay);
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VNET_DECLARE(int, ipsec_integrity);
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#define V_ipsec_replay VNET(ipsec_replay)
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#define V_ipsec_integrity VNET(ipsec_integrity)
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#endif
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VNET_PCPUSTAT_DECLARE(struct ipsecstat, ipsec4stat);
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VNET_DECLARE(int, ip4_esp_trans_deflev);
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VNET_DECLARE(int, ip4_esp_net_deflev);
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VNET_DECLARE(int, ip4_ah_trans_deflev);
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VNET_DECLARE(int, ip4_ah_net_deflev);
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VNET_DECLARE(int, ip4_ah_offsetmask);
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VNET_DECLARE(int, ip4_ipsec_dfbit);
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VNET_DECLARE(int, ip4_ipsec_ecn);
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VNET_DECLARE(int, ip4_esp_randpad);
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VNET_DECLARE(int, crypto_support);
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#define IPSECSTAT_INC(name) \
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VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1)
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#define V_ip4_esp_trans_deflev VNET(ip4_esp_trans_deflev)
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#define V_ip4_esp_net_deflev VNET(ip4_esp_net_deflev)
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#define V_ip4_ah_trans_deflev VNET(ip4_ah_trans_deflev)
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#define V_ip4_ah_net_deflev VNET(ip4_ah_net_deflev)
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#define V_ip4_ah_offsetmask VNET(ip4_ah_offsetmask)
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#define V_ip4_ipsec_dfbit VNET(ip4_ipsec_dfbit)
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#define V_ip4_ipsec_ecn VNET(ip4_ipsec_ecn)
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#define V_ip4_esp_randpad VNET(ip4_esp_randpad)
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#define V_crypto_support VNET(crypto_support)
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#define ipseclog(x) do { if (V_ipsec_debug) log x; } while (0)
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/* for openbsd compatibility */
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#define DPRINTF(x) do { if (V_ipsec_debug) printf x; } while (0)
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extern struct ipsecrequest *ipsec_newisr(void);
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extern void ipsec_delisr(struct ipsecrequest *);
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struct tdb_ident;
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extern struct secpolicy *ipsec_getpolicy(struct tdb_ident*, u_int);
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struct inpcb;
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extern struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, u_int,
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int *, struct inpcb *);
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extern struct secpolicy * ipsec_getpolicybyaddr(const struct mbuf *, u_int,
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int *);
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struct inpcb;
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extern int ipsec_init_policy(struct socket *so, struct inpcbpolicy **);
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extern int ipsec_copy_policy(struct inpcbpolicy *, struct inpcbpolicy *);
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extern u_int ipsec_get_reqlevel(struct ipsecrequest *);
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extern int ipsec_set_policy(struct inpcb *inp, int optname,
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caddr_t request, size_t len, struct ucred *cred);
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extern int ipsec_get_policy(struct inpcb *inpcb, caddr_t request,
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size_t len, struct mbuf **mp);
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extern int ipsec_delete_pcbpolicy(struct inpcb *);
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extern int ipsec4_in_reject(const struct mbuf *, struct inpcb *);
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struct secas;
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struct tcpcb;
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extern int ipsec_chkreplay(u_int32_t, struct secasvar *);
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extern int ipsec_updatereplay(u_int32_t, struct secasvar *);
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extern size_t ipsec_hdrsiz(const struct mbuf *, u_int, struct inpcb *);
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extern size_t ipsec_hdrsiz_tcp(struct tcpcb *);
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union sockaddr_union;
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extern char *ipsec_address(union sockaddr_union *, char *, socklen_t);
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extern char *ipsec_logsastr(struct secasvar *, char *, size_t);
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extern void ipsec_dumpmbuf(const struct mbuf *);
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struct m_tag;
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extern int ah4_input(struct mbuf **mp, int *offp, int proto);
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extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *);
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extern int esp4_input(struct mbuf **mp, int *offp, int proto);
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extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *);
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extern int ipcomp4_input(struct mbuf **mp, int *offp, int proto);
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extern int ipsec_common_input(struct mbuf *m, int, int, int, int);
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extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
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int skip, int protoff);
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extern int ipsec4_process_packet(struct mbuf *, struct ipsecrequest *);
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extern int ipsec_process_done(struct mbuf *, struct ipsecrequest *);
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extern void m_checkalignment(const char* where, struct mbuf *m0,
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int off, int len);
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extern struct mbuf *m_makespace(struct mbuf *m0, int skip, int hlen, int *off);
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extern caddr_t m_pad(struct mbuf *m, int n);
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extern int m_striphdr(struct mbuf *m, int skip, int hlen);
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#endif /* _KERNEL */
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#ifndef _KERNEL
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extern caddr_t ipsec_set_policy(char *, int);
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extern int ipsec_get_policylen(caddr_t);
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extern char *ipsec_dump_policy(caddr_t, char *);
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extern const char *ipsec_strerror(void);
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#endif /* ! KERNEL */
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#endif /* _NETIPSEC_IPSEC_H_ */
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