[apple/xnu.git] / bsd / netinet6 / ah_output.c

/*
 * Copyright (c) 2008-2011 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

/*	$FreeBSD: src/sys/netinet6/ah_output.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $	*/
/*	$KAME: ah_output.c,v 1.30 2001/02/21 00:50:53 itojun Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * RFC1826/2402 authentication header.
 */

#define _IP_VHL

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>

#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_var.h>

#if INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#endif

#include <netinet6/ipsec.h>
#if INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#if INET6
#include <netinet6/ah6.h>
#endif
#include <netkey/key.h>
#include <netkey/keydb.h>

#include <net/net_osdep.h>

#if INET
static struct in_addr *ah4_finaldst(struct mbuf *);
#endif

extern lck_mtx_t *sadb_mutex;

/*
 * compute AH header size.
 * transport mode only.  for tunnel mode, we should implement
 * virtual interface, and control MTU/MSS by the interface MTU.
 */
size_t
ah_hdrsiz(struct ipsecrequest *isr)
{

	/* sanity check */
	if (isr == NULL)
		panic("ah_hdrsiz: NULL was passed.\n");

	if (isr->saidx.proto != IPPROTO_AH)
		panic("unsupported mode passed to ah_hdrsiz");

#if 0
	{

		lck_mtx_lock(sadb_mutex);
		const struct ah_algorithm *algo;
		size_t hdrsiz;

		/*%%%%% this needs to change - no sav in ipsecrequest any more */
		if (isr->sav == NULL)
			goto estimate;
		if (isr->sav->state != SADB_SASTATE_MATURE
		 && isr->sav->state != SADB_SASTATE_DYING)
			goto estimate;
	
		/* we need transport mode AH. */
		algo = ah_algorithm_lookup(isr->sav->alg_auth);
		if (!algo)
			goto estimate;
	
		/*
		 * XXX
		 * right now we don't calcurate the padding size.  simply
		 * treat the padding size as constant, for simplicity.
		 *
		 * XXX variable size padding support
		 */
		hdrsiz = (((*algo->sumsiz)(isr->sav) + 3) & ~(4 - 1));
		if (isr->sav->flags & SADB_X_EXT_OLD)
			hdrsiz += sizeof(struct ah);
		else
			hdrsiz += sizeof(struct newah);
	
		lck_mtx_unlock(sadb_mutex);
		return hdrsiz;
	}

estimate:
#endif

    //lck_mtx_unlock(sadb_mutex);
	/* ASSUMING:
	 *	sizeof(struct newah) > sizeof(struct ah).
	 *	16 = (16 + 3) & ~(4 - 1).
	 */
	return sizeof(struct newah) + 16;
}

#if INET
/*
 * Modify the packet so that it includes the authentication data.
 * The mbuf passed must start with IPv4 header.
 *
 * assumes that the first mbuf contains IPv4 header + option only.
 * the function does not modify m.
 */
int
ah4_output(struct mbuf *m, struct secasvar *sav)
{
	const struct ah_algorithm *algo;
	u_int32_t spi;
	u_char *ahdrpos;
	u_char *ahsumpos = NULL;
	size_t hlen = 0;	/*IP header+option in bytes*/
	size_t plen = 0;	/*AH payload size in bytes*/
	size_t ahlen = 0;	/*plen + sizeof(ah)*/
	struct ip *ip;
	struct in_addr dst = { 0 };
	struct in_addr *finaldst;
	int error;

	/* sanity checks */
	if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
		ip = mtod(m, struct ip *);
		ipseclog((LOG_DEBUG, "ah4_output: internal error: "
			"sav->replay is null: %x->%x, SPI=%u\n",
			(u_int32_t)ntohl(ip->ip_src.s_addr),
			(u_int32_t)ntohl(ip->ip_dst.s_addr),
			(u_int32_t)ntohl(sav->spi)));
		IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
		m_freem(m);
		return EINVAL;
	}

	algo = ah_algorithm_lookup(sav->alg_auth);
	if (!algo) {
		ipseclog((LOG_ERR, "ah4_output: unsupported algorithm: "
		    "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
		IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
		m_freem(m);
		return EINVAL;
	}
	spi = sav->spi;

	/*
	 * determine the size to grow.
	 */
	if (sav->flags & SADB_X_EXT_OLD) {
		/* RFC 1826 */
		plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /*XXX pad to 8byte?*/
		ahlen = plen + sizeof(struct ah);
	} else {
		/* RFC 2402 */
		plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1); /*XXX pad to 8byte?*/
		ahlen = plen + sizeof(struct newah);
	}

	/*
	 * grow the mbuf to accomodate AH.
	 */
	ip = mtod(m, struct ip *);
#ifdef _IP_VHL
	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
	hlen = ip->ip_hl << 2;
#endif

	if (m->m_len != hlen)
		panic("ah4_output: assumption failed (first mbuf length)");
	if (M_LEADINGSPACE(m->m_next) < ahlen) {
		struct mbuf *n;
		MGET(n, M_DONTWAIT, MT_DATA);
		if (!n) {
			ipseclog((LOG_DEBUG, "ENOBUFS in ah4_output %d\n",
			    __LINE__));
			m_freem(m);
			return ENOBUFS;
		}
		n->m_len = ahlen;
		n->m_next = m->m_next;
		m->m_next = n;
		m->m_pkthdr.len += ahlen;
		ahdrpos = mtod(n, u_char *);
	} else {
		m->m_next->m_len += ahlen;
		m->m_next->m_data -= ahlen;
		m->m_pkthdr.len += ahlen;
		ahdrpos = mtod(m->m_next, u_char *);
	}

	ip = mtod(m, struct ip *);	/*just to be sure*/

	/*
	 * initialize AH.
	 */
	if (sav->flags & SADB_X_EXT_OLD) {
		struct ah *ahdr;

		ahdr = (struct ah *)(void *)ahdrpos;
		ahsumpos = (u_char *)(ahdr + 1);
		ahdr->ah_len = plen >> 2;
		ahdr->ah_nxt = ip->ip_p;
		ahdr->ah_reserve = htons(0);
		ahdr->ah_spi = spi;
		bzero(ahdr + 1, plen);
	} else {
		struct newah *ahdr;

		ahdr = (struct newah *)(void *)ahdrpos;
		ahsumpos = (u_char *)(ahdr + 1);
		ahdr->ah_len = (plen >> 2) + 1;	/* plus one for seq# */
		ahdr->ah_nxt = ip->ip_p;
		ahdr->ah_reserve = htons(0);
		ahdr->ah_spi = spi;
		if (sav->replay->count == ~0) {
			if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
				/* XXX Is it noisy ? */
				ipseclog((LOG_WARNING,
				    "replay counter overflowed. %s\n",
				    ipsec_logsastr(sav)));
				IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
				m_freem(m);
				return EINVAL;
			}
		}
		lck_mtx_lock(sadb_mutex);
		sav->replay->count++;
		lck_mtx_unlock(sadb_mutex);
		/*
		 * XXX sequence number must not be cycled, if the SA is
		 * installed by IKE daemon.
		 */
		ahdr->ah_seq = htonl(sav->replay->count);
		bzero(ahdr + 1, plen);
	}

	/*
	 * modify IPv4 header.
	 */
	ip->ip_p = IPPROTO_AH;
	if (ahlen < (IP_MAXPACKET - ntohs(ip->ip_len)))
		ip->ip_len = htons(ntohs(ip->ip_len) + ahlen);
	else {
		ipseclog((LOG_ERR, "IPv4 AH output: size exceeds limit\n"));
		IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
		m_freem(m);
		return EMSGSIZE;
	}

	/*
	 * If there is source routing option, update destination field in
	 * the IPv4 header to the final destination.
	 * Note that we do not need to update source routing option itself
	 * (as done in IPv4 AH processing -- see ip6_output()), since
	 * source routing option is not part of the ICV computation.
	 */
	finaldst = ah4_finaldst(m);
	if (finaldst) {
		dst.s_addr = ip->ip_dst.s_addr;
		ip->ip_dst.s_addr = finaldst->s_addr;
	}

	/*
	 * calcurate the checksum, based on security association
	 * and the algorithm specified.
	 */
	error = ah4_calccksum(m, (caddr_t)ahsumpos, plen, algo, sav);
	if (error) {
		ipseclog((LOG_ERR,
		    "error after ah4_calccksum, called from ah4_output"));
		m_freem(m);
		m = NULL;
		IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
		return error;
	}

	if (finaldst) {
		ip = mtod(m, struct ip *);	/*just to make sure*/
		ip->ip_dst.s_addr = dst.s_addr;
	}
	lck_mtx_lock(sadb_stat_mutex);
	ipsecstat.out_success++;
	ipsecstat.out_ahhist[sav->alg_auth]++;
	lck_mtx_unlock(sadb_stat_mutex);
	key_sa_recordxfer(sav, m);

	return 0;
}
#endif

/* Calculate AH length */
int
ah_hdrlen(struct secasvar *sav)
{
	const struct ah_algorithm *algo;
	int plen, ahlen;
	
	algo = ah_algorithm_lookup(sav->alg_auth);
	if (!algo)
		return 0;
	if (sav->flags & SADB_X_EXT_OLD) {
		/* RFC 1826 */
		plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);	/*XXX pad to 8byte?*/
		ahlen = plen + sizeof(struct ah);
	} else {
		/* RFC 2402 */
		plen = ((*algo->sumsiz)(sav) + 3) & ~(4 - 1);	/*XXX pad to 8byte?*/
		ahlen = plen + sizeof(struct newah);
	}

	return(ahlen);
}

#if INET6
/*
 * Fill in the Authentication Header and calculate checksum.
 */
int
ah6_output(struct mbuf *m, u_char *nexthdrp, struct mbuf *md,
	   struct secasvar *sav)
{
	struct mbuf *mprev;
	struct mbuf *mah;
	const struct ah_algorithm *algo;
	u_int32_t spi;
	u_char *ahsumpos = NULL;
	size_t plen;	/*AH payload size in bytes*/
	int error = 0;
	int ahlen;
	struct ip6_hdr *ip6;

	if (m->m_len < sizeof(struct ip6_hdr)) {
		ipseclog((LOG_DEBUG, "ah6_output: first mbuf too short\n"));
		m_freem(m);
		return EINVAL;
	}

	ahlen = ah_hdrlen(sav);
	if (ahlen == 0)
		return 0;

	for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
		;
	if (!mprev || mprev->m_next != md) {
		ipseclog((LOG_DEBUG, "ah6_output: md is not in chain\n"));
		m_freem(m);
		return EINVAL;
	}

	MGET(mah, M_DONTWAIT, MT_DATA);
	if (!mah) {
		m_freem(m);
		return ENOBUFS;
	}
	if (ahlen > MLEN) {
		MCLGET(mah, M_DONTWAIT);
		if ((mah->m_flags & M_EXT) == 0) {
			m_free(mah);
			m_freem(m);
			return ENOBUFS;
		}
	}
	mah->m_len = ahlen;
	mah->m_next = md;
	mprev->m_next = mah;
	m->m_pkthdr.len += ahlen;

	/* fix plen */
	if (m->m_pkthdr.len - sizeof(struct ip6_hdr) > IPV6_MAXPACKET) {
		ipseclog((LOG_ERR,
		    "ip6_output: AH with IPv6 jumbogram is not supported\n"));
		m_freem(m);
		return EINVAL;
	}
	ip6 = mtod(m, struct ip6_hdr *);
	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));

	if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
		ipseclog((LOG_DEBUG, "ah6_output: internal error: "
			  "sav->replay is null: SPI=%u\n",
			  (u_int32_t)ntohl(sav->spi)));
		IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
		m_freem(m);
		return EINVAL;
	}

	algo = ah_algorithm_lookup(sav->alg_auth);
	if (!algo) {
		ipseclog((LOG_ERR, "ah6_output: unsupported algorithm: "
		    "SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
		IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
		m_freem(m);
		return EINVAL;
	}
	spi = sav->spi;

	/*
	 * initialize AH.
	 */
	if (sav->flags & SADB_X_EXT_OLD) {
		struct ah *ahdr = mtod(mah, struct ah *);

		plen = mah->m_len - sizeof(struct ah);
		ahsumpos = (u_char *)(ahdr + 1);
		ahdr->ah_nxt = *nexthdrp;
		*nexthdrp = IPPROTO_AH;
		ahdr->ah_len = plen >> 2;
		ahdr->ah_reserve = htons(0);
		ahdr->ah_spi = spi;
		bzero(ahdr + 1, plen);
	} else {
		struct newah *ahdr = mtod(mah, struct newah *);

		plen = mah->m_len - sizeof(struct newah);
		ahsumpos = (u_char *)(ahdr + 1);
		ahdr->ah_nxt = *nexthdrp;
		*nexthdrp = IPPROTO_AH;
		ahdr->ah_len = (plen >> 2) + 1;	/* plus one for seq# */
		ahdr->ah_reserve = htons(0);
		ahdr->ah_spi = spi;
		if (sav->replay->count == ~0) {
			if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
				/* XXX Is it noisy ? */
				ipseclog((LOG_WARNING,
				     "replay counter overflowed. %s\n",
				    ipsec_logsastr(sav)));
				IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
				m_freem(m);
				return EINVAL;
			}
		}
		lck_mtx_lock(sadb_mutex);
		sav->replay->count++;
		lck_mtx_unlock(sadb_mutex);
		/*
		 * XXX sequence number must not be cycled, if the SA is
		 * installed by IKE daemon.
		 */
		ahdr->ah_seq = htonl(sav->replay->count);
		bzero(ahdr + 1, plen);
	}

	/*
	 * calcurate the checksum, based on security association
	 * and the algorithm specified.
	 */
	error = ah6_calccksum(m, (caddr_t)ahsumpos, plen, algo, sav);
	if (error) {
		IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
		m_freem(m);
	} else {
		IPSEC_STAT_INCREMENT(ipsec6stat.out_success);
		key_sa_recordxfer(sav, m);
	}
	IPSEC_STAT_INCREMENT(ipsec6stat.out_ahhist[sav->alg_auth]);

	return(error);
}
#endif

#if INET
/*
 * Find the final destination if there is loose/strict source routing option.
 * Returns NULL if there's no source routing options.
 * Returns NULL on errors too.
 * Note that this function will return a pointer INTO the given parameter,
 * struct mbuf *m.
 * The mbuf must be pulled up toward, at least, ip option part.
 */
static struct in_addr *
ah4_finaldst(struct mbuf *m)
{
	struct ip *ip;
	int optlen;
	u_char *q;
	int i;
	int hlen;

	if (!m)
		panic("ah4_finaldst: m == NULL");
	ip = mtod(m, struct ip *);
#ifdef _IP_VHL
	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
	hlen = ip->ip_hl << 2;
#endif

	if (m->m_len < hlen) {
		ipseclog((LOG_DEBUG,
		    "ah4_finaldst: parameter mbuf wrong (not pulled up)\n"));
		return NULL;
	}

	if (hlen == sizeof(struct ip))
		return NULL;

	optlen = hlen - sizeof(struct ip);
	if (optlen < 0) {
		ipseclog((LOG_DEBUG, "ah4_finaldst: wrong optlen %d\n",
		    optlen));
		return NULL;
	}

	q = (u_char *)(ip + 1);
	i = 0;
	while (i < optlen) {
		if (i + IPOPT_OPTVAL >= optlen)
			return NULL;
		if (q[i + IPOPT_OPTVAL] == IPOPT_EOL ||
		    q[i + IPOPT_OPTVAL] == IPOPT_NOP ||
		    i + IPOPT_OLEN < optlen)
			;
		else
			return NULL;

		switch (q[i + IPOPT_OPTVAL]) {
		case IPOPT_EOL:
			i = optlen;	/* bye */
			break;
		case IPOPT_NOP:
			i++;
			break;
		case IPOPT_LSRR:
		case IPOPT_SSRR:
			if (q[i + IPOPT_OLEN] < 2 + sizeof(struct in_addr) ||
			    optlen - i < q[i + IPOPT_OLEN]) {
				ipseclog((LOG_ERR,
				    "ip_finaldst: invalid IP option "
				    "(code=%02x len=%02x)\n",
				    q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
				return NULL;
			}
			i += q[i + IPOPT_OLEN] - sizeof(struct in_addr);
			return (struct in_addr *)(void *)(q + i);
		default:
			if (q[i + IPOPT_OLEN] < 2 ||
			    optlen - i < q[i + IPOPT_OLEN]) {
				ipseclog((LOG_ERR,
				    "ip_finaldst: invalid IP option "
				    "(code=%02x len=%02x)\n",
				    q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
				return NULL;
			}
			i += q[i + IPOPT_OLEN];
			break;
		}
	}
	return NULL;
}
#endif
Commit	Line	Data
b0d623f7	1	/*
316670eb	2	* Copyright (c) 2008-2011 Apple Inc. All rights reserved.
b0d623f7 A	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
9bccf70c A	29	/* $FreeBSD: src/sys/netinet6/ah_output.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $ */
9bccf70c A	30	/* $KAME: ah_output.c,v 1.30 2001/02/21 00:50:53 itojun Exp $ */
1c79356b A	31
	32	/*
	33	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	34	* All rights reserved.
	35	*
	36	* Redistribution and use in source and binary forms, with or without
	37	* modification, are permitted provided that the following conditions
	38	* are met:
	39	* 1. Redistributions of source code must retain the above copyright
	40	* notice, this list of conditions and the following disclaimer.
	41	* 2. Redistributions in binary form must reproduce the above copyright
	42	* notice, this list of conditions and the following disclaimer in the
	43	* documentation and/or other materials provided with the distribution.
	44	* 3. Neither the name of the project nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*/
	60
	61	/*
	62	* RFC1826/2402 authentication header.
	63	*/
	64
	65	#define _IP_VHL
1c79356b A	66
	67	#include <sys/param.h>
	68	#include <sys/systm.h>
	69	#include <sys/malloc.h>
	70	#include <sys/mbuf.h>
	71	#include <sys/domain.h>
	72	#include <sys/protosw.h>
	73	#include <sys/socket.h>
	74	#include <sys/socketvar.h>
	75	#include <sys/errno.h>
	76	#include <sys/time.h>
	77	#include <sys/kernel.h>
	78	#include <sys/syslog.h>
	79
	80	#include <net/if.h>
	81	#include <net/route.h>
	82
	83	#include <netinet/in.h>
	84
	85	#include <netinet/in_systm.h>
	86	#include <netinet/ip.h>
	87	#include <netinet/in_var.h>
	88
	89	#if INET6
	90	#include <netinet/ip6.h>
	91	#include <netinet6/ip6_var.h>
	92	#include <netinet/icmp6.h>
	93	#endif
	94
	95	#include <netinet6/ipsec.h>
9bccf70c A	96	#if INET6
	97	#include <netinet6/ipsec6.h>
	98	#endif
1c79356b	99	#include <netinet6/ah.h>
9bccf70c A	100	#if INET6
	101	#include <netinet6/ah6.h>
	102	#endif
1c79356b A	103	#include <netkey/key.h>
1c79356b A	104	#include <netkey/keydb.h>
1c79356b A	105
	106	#include <net/net_osdep.h>
	107
9bccf70c	108	#if INET
91447636	109	static struct in_addr ah4_finaldst(struct mbuf );
9bccf70c	110	#endif
1c79356b	111
2d21ac55 A	112	extern lck_mtx_t *sadb_mutex;
2d21ac55 A	113
1c79356b A	114	/*
	115	* compute AH header size.
	116	* transport mode only. for tunnel mode, we should implement
	117	* virtual interface, and control MTU/MSS by the interface MTU.
	118	*/
	119	size_t
39037602	120	ah_hdrsiz(struct ipsecrequest *isr)
1c79356b	121	{
1c79356b A	122
	123	/* sanity check */
	124	if (isr == NULL)
	125	panic("ah_hdrsiz: NULL was passed.\n");
	126
	127	if (isr->saidx.proto != IPPROTO_AH)
	128	panic("unsupported mode passed to ah_hdrsiz");
	129
2d21ac55 A	130	#if 0
2d21ac55 A	131	{
1c79356b	132
2d21ac55 A	133	lck_mtx_lock(sadb_mutex);
	134	const struct ah_algorithm *algo;
	135	size_t hdrsiz;
1c79356b	136
2d21ac55 A	137	/%%%%% this needs to change - no sav in ipsecrequest any more /
	138	if (isr->sav == NULL)
	139	goto estimate;
	140	if (isr->sav->state != SADB_SASTATE_MATURE
	141	&& isr->sav->state != SADB_SASTATE_DYING)
	142	goto estimate;
	143
	144	/* we need transport mode AH. */
	145	algo = ah_algorithm_lookup(isr->sav->alg_auth);
	146	if (!algo)
	147	goto estimate;
	148
	149	/*
	150	* XXX
	151	* right now we don't calcurate the padding size. simply
	152	* treat the padding size as constant, for simplicity.
	153	*
	154	* XXX variable size padding support
	155	*/
	156	hdrsiz = (((*algo->sumsiz)(isr->sav) + 3) & ~(4 - 1));
	157	if (isr->sav->flags & SADB_X_EXT_OLD)
	158	hdrsiz += sizeof(struct ah);
	159	else
	160	hdrsiz += sizeof(struct newah);
	161
	162	lck_mtx_unlock(sadb_mutex);
	163	return hdrsiz;
	164	}
1c79356b	165
2d21ac55 A	166	estimate:
2d21ac55 A	167	#endif
1c79356b	168
2d21ac55	169	//lck_mtx_unlock(sadb_mutex);
1c79356b A	170	/* ASSUMING:
	171	* sizeof(struct newah) > sizeof(struct ah).
	172	* 16 = (16 + 3) & ~(4 - 1).
	173	*/
	174	return sizeof(struct newah) + 16;
	175	}
	176
9bccf70c	177	#if INET
1c79356b A	178	/*
	179	* Modify the packet so that it includes the authentication data.
	180	* The mbuf passed must start with IPv4 header.
	181	*
	182	* assumes that the first mbuf contains IPv4 header + option only.
	183	* the function does not modify m.
	184	*/
	185	int
39037602	186	ah4_output(struct mbuf m, struct secasvar sav)
1c79356b	187	{
9bccf70c	188	const struct ah_algorithm *algo;
1c79356b A	189	u_int32_t spi;
	190	u_char *ahdrpos;
	191	u_char *ahsumpos = NULL;
	192	size_t hlen = 0; /IP header+option in bytes/
	193	size_t plen = 0; /AH payload size in bytes/
	194	size_t ahlen = 0; /plen + sizeof(ah)/
	195	struct ip *ip;
2d21ac55	196	struct in_addr dst = { 0 };
1c79356b A	197	struct in_addr *finaldst;
	198	int error;
	199
	200	/* sanity checks */
	201	if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
1c79356b A	202	ip = mtod(m, struct ip *);
	203	ipseclog((LOG_DEBUG, "ah4_output: internal error: "
	204	"sav->replay is null: %x->%x, SPI=%u\n",
	205	(u_int32_t)ntohl(ip->ip_src.s_addr),
	206	(u_int32_t)ntohl(ip->ip_dst.s_addr),
	207	(u_int32_t)ntohl(sav->spi)));
2d21ac55	208	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
1c79356b A	209	m_freem(m);
	210	return EINVAL;
	211	}
	212
9bccf70c A	213	algo = ah_algorithm_lookup(sav->alg_auth);
	214	if (!algo) {
	215	ipseclog((LOG_ERR, "ah4_output: unsupported algorithm: "
	216	"SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
2d21ac55	217	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
9bccf70c A	218	m_freem(m);
	219	return EINVAL;
	220	}
1c79356b A	221	spi = sav->spi;
	222
	223	/*
	224	* determine the size to grow.
	225	*/
	226	if (sav->flags & SADB_X_EXT_OLD) {
	227	/* RFC 1826 */
	228	plen = ((algo->sumsiz)(sav) + 3) & ~(4 - 1); /XXX pad to 8byte?*/
	229	ahlen = plen + sizeof(struct ah);
	230	} else {
	231	/* RFC 2402 */
	232	plen = ((algo->sumsiz)(sav) + 3) & ~(4 - 1); /XXX pad to 8byte?*/
	233	ahlen = plen + sizeof(struct newah);
	234	}
	235
	236	/*
	237	* grow the mbuf to accomodate AH.
	238	*/
	239	ip = mtod(m, struct ip *);
	240	#ifdef _IP_VHL
	241	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
	242	#else
	243	hlen = ip->ip_hl << 2;
	244	#endif
	245
	246	if (m->m_len != hlen)
	247	panic("ah4_output: assumption failed (first mbuf length)");
	248	if (M_LEADINGSPACE(m->m_next) < ahlen) {
	249	struct mbuf *n;
	250	MGET(n, M_DONTWAIT, MT_DATA);
	251	if (!n) {
	252	ipseclog((LOG_DEBUG, "ENOBUFS in ah4_output %d\n",
	253	__LINE__));
	254	m_freem(m);
	255	return ENOBUFS;
	256	}
	257	n->m_len = ahlen;
	258	n->m_next = m->m_next;
	259	m->m_next = n;
	260	m->m_pkthdr.len += ahlen;
	261	ahdrpos = mtod(n, u_char *);
	262	} else {
	263	m->m_next->m_len += ahlen;
	264	m->m_next->m_data -= ahlen;
	265	m->m_pkthdr.len += ahlen;
	266	ahdrpos = mtod(m->m_next, u_char *);
	267	}
	268
	269	ip = mtod(m, struct ip ); /just to be sure*/
	270
	271	/*
	272	* initialize AH.
	273	*/
	274	if (sav->flags & SADB_X_EXT_OLD) {
	275	struct ah *ahdr;
	276
316670eb	277	ahdr = (struct ah )(void )ahdrpos;
1c79356b A	278	ahsumpos = (u_char *)(ahdr + 1);
	279	ahdr->ah_len = plen >> 2;
	280	ahdr->ah_nxt = ip->ip_p;
	281	ahdr->ah_reserve = htons(0);
	282	ahdr->ah_spi = spi;
	283	bzero(ahdr + 1, plen);
	284	} else {
	285	struct newah *ahdr;
	286
316670eb	287	ahdr = (struct newah )(void )ahdrpos;
1c79356b A	288	ahsumpos = (u_char *)(ahdr + 1);
	289	ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
	290	ahdr->ah_nxt = ip->ip_p;
	291	ahdr->ah_reserve = htons(0);
	292	ahdr->ah_spi = spi;
	293	if (sav->replay->count == ~0) {
	294	if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
	295	/* XXX Is it noisy ? */
	296	ipseclog((LOG_WARNING,
	297	"replay counter overflowed. %s\n",
	298	ipsec_logsastr(sav)));
2d21ac55	299	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
1c79356b A	300	m_freem(m);
	301	return EINVAL;
	302	}
	303	}
2d21ac55	304	lck_mtx_lock(sadb_mutex);
1c79356b	305	sav->replay->count++;
2d21ac55	306	lck_mtx_unlock(sadb_mutex);
1c79356b A	307	/*
	308	* XXX sequence number must not be cycled, if the SA is
	309	* installed by IKE daemon.
	310	*/
	311	ahdr->ah_seq = htonl(sav->replay->count);
	312	bzero(ahdr + 1, plen);
	313	}
	314
	315	/*
	316	* modify IPv4 header.
	317	*/
	318	ip->ip_p = IPPROTO_AH;
	319	if (ahlen < (IP_MAXPACKET - ntohs(ip->ip_len)))
	320	ip->ip_len = htons(ntohs(ip->ip_len) + ahlen);
	321	else {
	322	ipseclog((LOG_ERR, "IPv4 AH output: size exceeds limit\n"));
2d21ac55	323	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
1c79356b A	324	m_freem(m);
	325	return EMSGSIZE;
	326	}
	327
	328	/*
	329	* If there is source routing option, update destination field in
	330	* the IPv4 header to the final destination.
	331	* Note that we do not need to update source routing option itself
	332	* (as done in IPv4 AH processing -- see ip6_output()), since
	333	* source routing option is not part of the ICV computation.
	334	*/
	335	finaldst = ah4_finaldst(m);
	336	if (finaldst) {
	337	dst.s_addr = ip->ip_dst.s_addr;
	338	ip->ip_dst.s_addr = finaldst->s_addr;
	339	}
	340
	341	/*
	342	* calcurate the checksum, based on security association
	343	* and the algorithm specified.
	344	*/
9bccf70c	345	error = ah4_calccksum(m, (caddr_t)ahsumpos, plen, algo, sav);
1c79356b A	346	if (error) {
	347	ipseclog((LOG_ERR,
	348	"error after ah4_calccksum, called from ah4_output"));
9bccf70c	349	m_freem(m);
1c79356b	350	m = NULL;
2d21ac55	351	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
1c79356b A	352	return error;
	353	}
	354
	355	if (finaldst) {
	356	ip = mtod(m, struct ip ); /just to make sure*/
	357	ip->ip_dst.s_addr = dst.s_addr;
	358	}
2d21ac55	359	lck_mtx_lock(sadb_stat_mutex);
1c79356b A	360	ipsecstat.out_success++;
1c79356b A	361	ipsecstat.out_ahhist[sav->alg_auth]++;
2d21ac55	362	lck_mtx_unlock(sadb_stat_mutex);
1c79356b A	363	key_sa_recordxfer(sav, m);
	364
	365	return 0;
	366	}
9bccf70c	367	#endif
1c79356b A	368
	369	/* Calculate AH length */
	370	int
39037602	371	ah_hdrlen(struct secasvar *sav)
1c79356b	372	{
9bccf70c	373	const struct ah_algorithm *algo;
1c79356b A	374	int plen, ahlen;
1c79356b A	375
9bccf70c A	376	algo = ah_algorithm_lookup(sav->alg_auth);
	377	if (!algo)
	378	return 0;
1c79356b A	379	if (sav->flags & SADB_X_EXT_OLD) {
	380	/* RFC 1826 */
	381	plen = ((algo->sumsiz)(sav) + 3) & ~(4 - 1); /XXX pad to 8byte?*/
	382	ahlen = plen + sizeof(struct ah);
	383	} else {
	384	/* RFC 2402 */
	385	plen = ((algo->sumsiz)(sav) + 3) & ~(4 - 1); /XXX pad to 8byte?*/
	386	ahlen = plen + sizeof(struct newah);
	387	}
	388
	389	return(ahlen);
	390	}
	391
	392	#if INET6
	393	/*
	394	* Fill in the Authentication Header and calculate checksum.
	395	*/
	396	int
39037602 A	397	ah6_output(struct mbuf m, u_char nexthdrp, struct mbuf *md,
39037602 A	398	struct secasvar *sav)
1c79356b A	399	{
	400	struct mbuf *mprev;
	401	struct mbuf *mah;
9bccf70c	402	const struct ah_algorithm *algo;
1c79356b A	403	u_int32_t spi;
	404	u_char *ahsumpos = NULL;
	405	size_t plen; /AH payload size in bytes/
	406	int error = 0;
	407	int ahlen;
	408	struct ip6_hdr *ip6;
	409
	410	if (m->m_len < sizeof(struct ip6_hdr)) {
	411	ipseclog((LOG_DEBUG, "ah6_output: first mbuf too short\n"));
	412	m_freem(m);
	413	return EINVAL;
	414	}
	415
	416	ahlen = ah_hdrlen(sav);
	417	if (ahlen == 0)
	418	return 0;
	419
	420	for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
	421	;
	422	if (!mprev \|\| mprev->m_next != md) {
	423	ipseclog((LOG_DEBUG, "ah6_output: md is not in chain\n"));
	424	m_freem(m);
	425	return EINVAL;
	426	}
	427
	428	MGET(mah, M_DONTWAIT, MT_DATA);
	429	if (!mah) {
	430	m_freem(m);
	431	return ENOBUFS;
	432	}
	433	if (ahlen > MLEN) {
	434	MCLGET(mah, M_DONTWAIT);
	435	if ((mah->m_flags & M_EXT) == 0) {
	436	m_free(mah);
	437	m_freem(m);
	438	return ENOBUFS;
	439	}
	440	}
	441	mah->m_len = ahlen;
	442	mah->m_next = md;
	443	mprev->m_next = mah;
	444	m->m_pkthdr.len += ahlen;
	445
	446	/* fix plen */
	447	if (m->m_pkthdr.len - sizeof(struct ip6_hdr) > IPV6_MAXPACKET) {
	448	ipseclog((LOG_ERR,
	449	"ip6_output: AH with IPv6 jumbogram is not supported\n"));
	450	m_freem(m);
	451	return EINVAL;
	452	}
	453	ip6 = mtod(m, struct ip6_hdr *);
	454	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
	455
	456	if ((sav->flags & SADB_X_EXT_OLD) == 0 && !sav->replay) {
	457	ipseclog((LOG_DEBUG, "ah6_output: internal error: "
2d21ac55 A	458	"sav->replay is null: SPI=%u\n",
	459	(u_int32_t)ntohl(sav->spi)));
	460	IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
1c79356b A	461	m_freem(m);
	462	return EINVAL;
	463	}
	464
9bccf70c A	465	algo = ah_algorithm_lookup(sav->alg_auth);
	466	if (!algo) {
	467	ipseclog((LOG_ERR, "ah6_output: unsupported algorithm: "
	468	"SPI=%u\n", (u_int32_t)ntohl(sav->spi)));
2d21ac55	469	IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
9bccf70c A	470	m_freem(m);
	471	return EINVAL;
	472	}
1c79356b A	473	spi = sav->spi;
	474
	475	/*
	476	* initialize AH.
	477	*/
	478	if (sav->flags & SADB_X_EXT_OLD) {
	479	struct ah ahdr = mtod(mah, struct ah );
	480
	481	plen = mah->m_len - sizeof(struct ah);
	482	ahsumpos = (u_char *)(ahdr + 1);
	483	ahdr->ah_nxt = *nexthdrp;
	484	*nexthdrp = IPPROTO_AH;
	485	ahdr->ah_len = plen >> 2;
	486	ahdr->ah_reserve = htons(0);
	487	ahdr->ah_spi = spi;
	488	bzero(ahdr + 1, plen);
	489	} else {
	490	struct newah ahdr = mtod(mah, struct newah );
	491
	492	plen = mah->m_len - sizeof(struct newah);
	493	ahsumpos = (u_char *)(ahdr + 1);
	494	ahdr->ah_nxt = *nexthdrp;
	495	*nexthdrp = IPPROTO_AH;
	496	ahdr->ah_len = (plen >> 2) + 1; /* plus one for seq# */
	497	ahdr->ah_reserve = htons(0);
	498	ahdr->ah_spi = spi;
	499	if (sav->replay->count == ~0) {
	500	if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) {
	501	/* XXX Is it noisy ? */
	502	ipseclog((LOG_WARNING,
2d21ac55	503	"replay counter overflowed. %s\n",
1c79356b	504	ipsec_logsastr(sav)));
2d21ac55	505	IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
1c79356b A	506	m_freem(m);
	507	return EINVAL;
	508	}
	509	}
2d21ac55	510	lck_mtx_lock(sadb_mutex);
1c79356b	511	sav->replay->count++;
2d21ac55	512	lck_mtx_unlock(sadb_mutex);
1c79356b A	513	/*
	514	* XXX sequence number must not be cycled, if the SA is
	515	* installed by IKE daemon.
	516	*/
	517	ahdr->ah_seq = htonl(sav->replay->count);
	518	bzero(ahdr + 1, plen);
	519	}
	520
	521	/*
	522	* calcurate the checksum, based on security association
	523	* and the algorithm specified.
	524	*/
9bccf70c	525	error = ah6_calccksum(m, (caddr_t)ahsumpos, plen, algo, sav);
1c79356b	526	if (error) {
2d21ac55	527	IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
1c79356b A	528	m_freem(m);
1c79356b A	529	} else {
2d21ac55	530	IPSEC_STAT_INCREMENT(ipsec6stat.out_success);
1c79356b A	531	key_sa_recordxfer(sav, m);
1c79356b A	532	}
2d21ac55	533	IPSEC_STAT_INCREMENT(ipsec6stat.out_ahhist[sav->alg_auth]);
1c79356b A	534
	535	return(error);
	536	}
	537	#endif
	538
9bccf70c	539	#if INET
1c79356b A	540	/*
	541	* Find the final destination if there is loose/strict source routing option.
	542	* Returns NULL if there's no source routing options.
	543	* Returns NULL on errors too.
	544	* Note that this function will return a pointer INTO the given parameter,
	545	* struct mbuf *m.
	546	* The mbuf must be pulled up toward, at least, ip option part.
	547	*/
	548	static struct in_addr *
39037602	549	ah4_finaldst(struct mbuf *m)
1c79356b A	550	{
	551	struct ip *ip;
	552	int optlen;
	553	u_char *q;
	554	int i;
	555	int hlen;
	556
	557	if (!m)
	558	panic("ah4_finaldst: m == NULL");
	559	ip = mtod(m, struct ip *);
	560	#ifdef _IP_VHL
	561	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
	562	#else
	563	hlen = ip->ip_hl << 2;
	564	#endif
	565
	566	if (m->m_len < hlen) {
	567	ipseclog((LOG_DEBUG,
	568	"ah4_finaldst: parameter mbuf wrong (not pulled up)\n"));
	569	return NULL;
	570	}
	571
	572	if (hlen == sizeof(struct ip))
	573	return NULL;
	574
	575	optlen = hlen - sizeof(struct ip);
	576	if (optlen < 0) {
	577	ipseclog((LOG_DEBUG, "ah4_finaldst: wrong optlen %d\n",
	578	optlen));
	579	return NULL;
	580	}
	581
	582	q = (u_char *)(ip + 1);
	583	i = 0;
	584	while (i < optlen) {
9bccf70c A	585	if (i + IPOPT_OPTVAL >= optlen)
	586	return NULL;
	587	if (q[i + IPOPT_OPTVAL] == IPOPT_EOL \|\|
	588	q[i + IPOPT_OPTVAL] == IPOPT_NOP \|\|
	589	i + IPOPT_OLEN < optlen)
	590	;
	591	else
	592	return NULL;
	593
1c79356b A	594	switch (q[i + IPOPT_OPTVAL]) {
	595	case IPOPT_EOL:
	596	i = optlen; /* bye */
	597	break;
	598	case IPOPT_NOP:
	599	i++;
	600	break;
	601	case IPOPT_LSRR:
	602	case IPOPT_SSRR:
9bccf70c A	603	if (q[i + IPOPT_OLEN] < 2 + sizeof(struct in_addr) \|\|
9bccf70c A	604	optlen - i < q[i + IPOPT_OLEN]) {
1c79356b A	605	ipseclog((LOG_ERR,
	606	"ip_finaldst: invalid IP option "
	607	"(code=%02x len=%02x)\n",
	608	q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
	609	return NULL;
	610	}
	611	i += q[i + IPOPT_OLEN] - sizeof(struct in_addr);
316670eb	612	return (struct in_addr )(void )(q + i);
1c79356b	613	default:
9bccf70c A	614	if (q[i + IPOPT_OLEN] < 2 \|\|
9bccf70c A	615	optlen - i < q[i + IPOPT_OLEN]) {
1c79356b A	616	ipseclog((LOG_ERR,
	617	"ip_finaldst: invalid IP option "
	618	"(code=%02x len=%02x)\n",
	619	q[i + IPOPT_OPTVAL], q[i + IPOPT_OLEN]));
	620	return NULL;
	621	}
	622	i += q[i + IPOPT_OLEN];
	623	break;
	624	}
	625	}
	626	return NULL;
	627	}
9bccf70c	628	#endif