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

/*	$FreeBSD: src/sys/netinet6/ipcomp_output.c,v 1.1.2.2 2001/07/03 11:01:54 ume Exp $	*/
/*	$KAME: ipcomp_output.c,v 1.23 2001/01/23 08:59:37 itojun Exp $	*/

/*
 * Copyright (C) 1999 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.
 */

/*
 * RFC2393 IP payload compression protocol (IPComp).
 */


#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/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/route.h>
#include <libkern/zlib.h>
#include <kern/cpu_number.h>
#include <kern/locks.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_ecn.h>

#if INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#endif
#include <netinet6/ipcomp.h>
#if INET6
#include <netinet6/ipcomp6.h>
#endif

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

#include <net/net_osdep.h>


static int ipcomp_output(struct mbuf *, u_char *, struct mbuf *,
	int, struct secasvar *sav);

/*
 * Modify the packet so that the payload is compressed.
 * The mbuf (m) must start with IPv4 or IPv6 header.
 * On failure, free the given mbuf and return non-zero.
 *
 * on invocation:
 *	m   nexthdrp md
 *	v   v        v
 *	IP ......... payload
 * during the encryption:
 *	m   nexthdrp mprev md
 *	v   v        v     v
 *	IP ............... ipcomp payload
 *	                   <-----><----->
 *	                   complen  plen
 *	<-> hlen
 *	<-----------------> compoff
 */
static int
ipcomp_output(m, nexthdrp, md, af, sav)
	struct mbuf *m;
	u_char *nexthdrp;
	struct mbuf *md;
	int af;
	struct secasvar *sav;
{
	struct mbuf *n;
	struct mbuf *md0;
	struct mbuf *mcopy;
	struct mbuf *mprev;
	struct ipcomp *ipcomp;
	const struct ipcomp_algorithm *algo;
	u_int16_t cpi;		/* host order */
	size_t plen0, plen;	/*payload length to be compressed*/
	size_t compoff;
	int afnumber;
	int error = 0;
	struct ipsecstat *stat;

	switch (af) {
#if INET
	case AF_INET:
		afnumber = 4;
		stat = &ipsecstat;
		break;
#endif
#if INET6
	case AF_INET6:
		afnumber = 6;
		stat = &ipsec6stat;
		break;
#endif
	default:
		ipseclog((LOG_ERR, "ipcomp_output: unsupported af %d\n", af));
		return 0;	/* no change at all */
	}

	/* grab parameters */
	algo = ipcomp_algorithm_lookup(sav->alg_enc);
	if ((ntohl(sav->spi) & ~0xffff) != 0 || !algo) {
		IPSEC_STAT_INCREMENT(stat->out_inval);
		m_freem(m);
		return EINVAL;
	}
	if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
		cpi = sav->alg_enc;
	else
		cpi = ntohl(sav->spi) & 0xffff;

	/* compute original payload length */
	plen = 0;
	for (n = md; n; n = n->m_next)
		plen += n->m_len;

	/* if the payload is short enough, we don't need to compress */
	if (plen < algo->minplen)
		return 0;

	/*
	 * retain the original packet for two purposes:
	 * (1) we need to backout our changes when compression is not necessary.
	 * (2) byte lifetime computation should use the original packet.
	 *     see RFC2401 page 23.
	 * compromise two m_copym().  we will be going through every byte of
	 * the payload during compression process anyways.
	 */
	mcopy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
	if (mcopy == NULL) {
		error = ENOBUFS;
		return 0;
	}
	md0 = m_copym(md, 0, M_COPYALL, M_NOWAIT);
	if (md0 == NULL) {
		m_freem(mcopy);
		error = ENOBUFS;
		return 0;
	}
	plen0 = plen;

	/* make the packet over-writable */
	for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
		;
	if (mprev == NULL || mprev->m_next != md) {
		ipseclog((LOG_DEBUG, "ipcomp%d_output: md is not in chain\n",
		    afnumber));
		IPSEC_STAT_INCREMENT(stat->out_inval);
		m_freem(m);
		m_freem(md0);
		m_freem(mcopy);
		return EINVAL;
	}
	mprev->m_next = NULL;
	if ((md = ipsec_copypkt(md)) == NULL) {
		m_freem(m);
		m_freem(md0);
		m_freem(mcopy);
		error = ENOBUFS;
		goto fail;
	}
	mprev->m_next = md;

	/* compress data part */
	if ((*algo->compress)(m, md, &plen) || mprev->m_next == NULL) {
		ipseclog((LOG_ERR, "packet compression failure\n"));
		m = NULL;
		m_freem(md0);
		m_freem(mcopy);
		IPSEC_STAT_INCREMENT(stat->out_inval);
		error = EINVAL;
		goto fail;
	}
	IPSEC_STAT_INCREMENT(stat->out_comphist[sav->alg_enc]);
	md = mprev->m_next;

	/*
	 * if the packet became bigger, meaningless to use IPComp.
	 * we've only wasted our cpu time.
	 */
	if (plen0 < plen) {
		m_freem(md);
		m_freem(mcopy);
		mprev->m_next = md0;
		return 0;
	}

	/*
	 * no need to backout change beyond here.
	 */
	m_freem(md0);
	md0 = NULL;

	m->m_pkthdr.len -= plen0;
	m->m_pkthdr.len += plen;

    {
	/*
	 * insert IPComp header.
	 */
#if INET
	struct ip *ip = NULL;
#endif
#if INET6
	struct ip6_hdr *ip6 = NULL;
#endif
	size_t hlen = 0;	/*ip header len*/
	size_t complen = sizeof(struct ipcomp);

	switch (af) {
#if INET
	case AF_INET:
		ip = mtod(m, struct ip *);
#ifdef _IP_VHL
		hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
		hlen = ip->ip_hl << 2;
#endif
		break;
#endif
#if INET6
	case AF_INET6:
		ip6 = mtod(m, struct ip6_hdr *);
		hlen = sizeof(*ip6);
		break;
#endif
	}

	compoff = m->m_pkthdr.len - plen;

	/*
	 * grow the mbuf to accomodate ipcomp header.
	 * before: IP ... payload
	 * after:  IP ... ipcomp payload
	 */
	if (M_LEADINGSPACE(md) < complen) {
		MGET(n, M_DONTWAIT, MT_DATA);
		if (!n) {
			m_freem(m);
			error = ENOBUFS;
			goto fail;
		}
		n->m_len = complen;
		mprev->m_next = n;
		n->m_next = md;
		m->m_pkthdr.len += complen;
		ipcomp = mtod(n, struct ipcomp *);
	} else {
		md->m_len += complen;
		md->m_data -= complen;
		m->m_pkthdr.len += complen;
		ipcomp = mtod(md, struct ipcomp *);
	}
	
	bzero(ipcomp, sizeof(*ipcomp));
	ipcomp->comp_nxt = *nexthdrp;
	*nexthdrp = IPPROTO_IPCOMP;
	ipcomp->comp_cpi = htons(cpi);
	switch (af) {
#if INET
	case AF_INET:
		if (compoff + complen + plen < IP_MAXPACKET)
			ip->ip_len = htons(compoff + complen + plen);
		else {
			ipseclog((LOG_ERR,
			    "IPv4 ESP output: size exceeds limit\n"));
			IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
			m_freem(m);
			error = EMSGSIZE;
			goto fail;
		}
		break;
#endif
#if INET6
	case AF_INET6:
		/* total packet length will be computed in ip6_output() */
		break;
#endif
	}
    }

	if (!m) {
		ipseclog((LOG_DEBUG,
		    "NULL mbuf after compression in ipcomp%d_output",
		    afnumber));
		IPSEC_STAT_INCREMENT(stat->out_inval);
	}
		IPSEC_STAT_INCREMENT(stat->out_success);

	/* compute byte lifetime against original packet */
	key_sa_recordxfer(sav, mcopy);
	m_freem(mcopy);

	return 0;

fail:
#if 1
	return error;
#else
	panic("something bad in ipcomp_output");
#endif
}

#if INET
int
ipcomp4_output(m, sav)
	struct mbuf *m;
	struct secasvar *sav;
{
	struct ip *ip;
	if (m->m_len < sizeof(struct ip)) {
		ipseclog((LOG_DEBUG, "ipcomp4_output: first mbuf too short\n"));
		IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
		m_freem(m);
		return 0;
	}
	ip = mtod(m, struct ip *);
	/* XXX assumes that m->m_next points to payload */
	return ipcomp_output(m, &ip->ip_p, m->m_next, AF_INET, sav);
}
#endif /*INET*/

#if INET6
int
ipcomp6_output(m, nexthdrp, md, sav)
	struct mbuf *m;
	u_char *nexthdrp;
	struct mbuf *md;
	struct secasvar *sav;
{
	if (m->m_len < sizeof(struct ip6_hdr)) {
		ipseclog((LOG_DEBUG, "ipcomp6_output: first mbuf too short\n"));
		IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
		m_freem(m);
		return 0;
	}
	return ipcomp_output(m, nexthdrp, md, AF_INET6, sav);
}
#endif /*INET6*/
Commit	Line	Data
9bccf70c A	1	/* $FreeBSD: src/sys/netinet6/ipcomp_output.c,v 1.1.2.2 2001/07/03 11:01:54 ume Exp $ */
9bccf70c A	2	/* $KAME: ipcomp_output.c,v 1.23 2001/01/23 08:59:37 itojun Exp $ */
1c79356b A	3
	4	/*
	5	* Copyright (C) 1999 WIDE Project.
	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the name of the project nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
	33	/*
	34	* RFC2393 IP payload compression protocol (IPComp).
	35	*/
	36
1c79356b A	37
	38	#include <sys/param.h>
	39	#include <sys/systm.h>
	40	#include <sys/malloc.h>
	41	#include <sys/mbuf.h>
	42	#include <sys/domain.h>
	43	#include <sys/protosw.h>
	44	#include <sys/socket.h>
	45	#include <sys/errno.h>
	46	#include <sys/time.h>
	47	#include <sys/kernel.h>
	48	#include <sys/syslog.h>
	49
	50	#include <net/if.h>
	51	#include <net/route.h>
2d21ac55	52	#include <libkern/zlib.h>
1c79356b	53	#include <kern/cpu_number.h>
91447636	54	#include <kern/locks.h>
1c79356b A	55
	56	#include <netinet/in.h>
	57	#include <netinet/in_systm.h>
	58	#include <netinet/in_var.h>
	59	#include <netinet/ip.h>
	60	#include <netinet/ip_var.h>
	61	#include <netinet/ip_ecn.h>
	62
	63	#if INET6
	64	#include <netinet/ip6.h>
	65	#include <netinet6/ip6_var.h>
	66	#endif
	67	#include <netinet6/ipcomp.h>
9bccf70c A	68	#if INET6
	69	#include <netinet6/ipcomp6.h>
	70	#endif
1c79356b A	71
1c79356b A	72	#include <netinet6/ipsec.h>
9bccf70c A	73	#if INET6
	74	#include <netinet6/ipsec6.h>
	75	#endif
1c79356b A	76	#include <netkey/key.h>
1c79356b A	77	#include <netkey/keydb.h>
1c79356b A	78
	79	#include <net/net_osdep.h>
	80
91447636 A	81
91447636 A	82	static int ipcomp_output(struct mbuf , u_char , struct mbuf *,
2d21ac55	83	int, struct secasvar *sav);
1c79356b A	84
	85	/*
	86	* Modify the packet so that the payload is compressed.
	87	* The mbuf (m) must start with IPv4 or IPv6 header.
9bccf70c	88	* On failure, free the given mbuf and return non-zero.
1c79356b A	89	*
	90	* on invocation:
	91	* m nexthdrp md
	92	* v v v
	93	* IP ......... payload
	94	* during the encryption:
	95	* m nexthdrp mprev md
	96	* v v v v
	97	* IP ............... ipcomp payload
	98	* <-----><----->
	99	* complen plen
	100	* <-> hlen
	101	* <-----------------> compoff
	102	*/
	103	static int
2d21ac55	104	ipcomp_output(m, nexthdrp, md, af, sav)
1c79356b A	105	struct mbuf *m;
	106	u_char *nexthdrp;
	107	struct mbuf *md;
1c79356b	108	int af;
2d21ac55	109	struct secasvar *sav;
1c79356b A	110	{
	111	struct mbuf *n;
	112	struct mbuf *md0;
9bccf70c	113	struct mbuf *mcopy;
1c79356b A	114	struct mbuf *mprev;
1c79356b A	115	struct ipcomp *ipcomp;
9bccf70c	116	const struct ipcomp_algorithm *algo;
1c79356b A	117	u_int16_t cpi; /* host order */
	118	size_t plen0, plen; /payload length to be compressed/
	119	size_t compoff;
	120	int afnumber;
	121	int error = 0;
9bccf70c	122	struct ipsecstat *stat;
1c79356b A	123
	124	switch (af) {
	125	#if INET
	126	case AF_INET:
	127	afnumber = 4;
9bccf70c	128	stat = &ipsecstat;
1c79356b A	129	break;
	130	#endif
	131	#if INET6
	132	case AF_INET6:
	133	afnumber = 6;
9bccf70c	134	stat = &ipsec6stat;
1c79356b A	135	break;
	136	#endif
	137	default:
	138	ipseclog((LOG_ERR, "ipcomp_output: unsupported af %d\n", af));
	139	return 0; /* no change at all */
	140	}
	141
	142	/* grab parameters */
9bccf70c A	143	algo = ipcomp_algorithm_lookup(sav->alg_enc);
9bccf70c A	144	if ((ntohl(sav->spi) & ~0xffff) != 0 \|\| !algo) {
2d21ac55	145	IPSEC_STAT_INCREMENT(stat->out_inval);
1c79356b A	146	m_freem(m);
	147	return EINVAL;
	148	}
	149	if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
	150	cpi = sav->alg_enc;
	151	else
	152	cpi = ntohl(sav->spi) & 0xffff;
1c79356b A	153
	154	/* compute original payload length */
	155	plen = 0;
	156	for (n = md; n; n = n->m_next)
	157	plen += n->m_len;
	158
	159	/* if the payload is short enough, we don't need to compress */
	160	if (plen < algo->minplen)
	161	return 0;
	162
	163	/*
9bccf70c A	164	* retain the original packet for two purposes:
	165	* (1) we need to backout our changes when compression is not necessary.
	166	* (2) byte lifetime computation should use the original packet.
	167	* see RFC2401 page 23.
	168	* compromise two m_copym(). we will be going through every byte of
	169	* the payload during compression process anyways.
1c79356b	170	*/
9bccf70c A	171	mcopy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
	172	if (mcopy == NULL) {
	173	error = ENOBUFS;
	174	return 0;
	175	}
1c79356b A	176	md0 = m_copym(md, 0, M_COPYALL, M_NOWAIT);
1c79356b A	177	if (md0 == NULL) {
9bccf70c	178	m_freem(mcopy);
1c79356b A	179	error = ENOBUFS;
	180	return 0;
	181	}
	182	plen0 = plen;
	183
	184	/* make the packet over-writable */
	185	for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
	186	;
	187	if (mprev == NULL \|\| mprev->m_next != md) {
	188	ipseclog((LOG_DEBUG, "ipcomp%d_output: md is not in chain\n",
	189	afnumber));
2d21ac55	190	IPSEC_STAT_INCREMENT(stat->out_inval);
1c79356b A	191	m_freem(m);
1c79356b A	192	m_freem(md0);
9bccf70c	193	m_freem(mcopy);
1c79356b A	194	return EINVAL;
	195	}
	196	mprev->m_next = NULL;
	197	if ((md = ipsec_copypkt(md)) == NULL) {
	198	m_freem(m);
	199	m_freem(md0);
9bccf70c	200	m_freem(mcopy);
1c79356b A	201	error = ENOBUFS;
	202	goto fail;
	203	}
	204	mprev->m_next = md;
	205
	206	/* compress data part */
	207	if ((*algo->compress)(m, md, &plen) \|\| mprev->m_next == NULL) {
	208	ipseclog((LOG_ERR, "packet compression failure\n"));
	209	m = NULL;
	210	m_freem(md0);
9bccf70c	211	m_freem(mcopy);
2d21ac55	212	IPSEC_STAT_INCREMENT(stat->out_inval);
1c79356b A	213	error = EINVAL;
	214	goto fail;
	215	}
2d21ac55	216	IPSEC_STAT_INCREMENT(stat->out_comphist[sav->alg_enc]);
1c79356b A	217	md = mprev->m_next;
	218
	219	/*
	220	* if the packet became bigger, meaningless to use IPComp.
	221	* we've only wasted our cpu time.
	222	*/
	223	if (plen0 < plen) {
	224	m_freem(md);
9bccf70c	225	m_freem(mcopy);
1c79356b A	226	mprev->m_next = md0;
	227	return 0;
	228	}
	229
9bccf70c A	230	/*
	231	* no need to backout change beyond here.
	232	*/
1c79356b A	233	m_freem(md0);
1c79356b A	234	md0 = NULL;
9bccf70c	235
1c79356b A	236	m->m_pkthdr.len -= plen0;
	237	m->m_pkthdr.len += plen;
	238
	239	{
	240	/*
	241	* insert IPComp header.
	242	*/
	243	#if INET
	244	struct ip *ip = NULL;
	245	#endif
	246	#if INET6
	247	struct ip6_hdr *ip6 = NULL;
	248	#endif
	249	size_t hlen = 0; /ip header len/
	250	size_t complen = sizeof(struct ipcomp);
	251
	252	switch (af) {
	253	#if INET
	254	case AF_INET:
	255	ip = mtod(m, struct ip *);
	256	#ifdef _IP_VHL
	257	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
	258	#else
	259	hlen = ip->ip_hl << 2;
	260	#endif
	261	break;
	262	#endif
	263	#if INET6
	264	case AF_INET6:
	265	ip6 = mtod(m, struct ip6_hdr *);
	266	hlen = sizeof(*ip6);
	267	break;
	268	#endif
	269	}
	270
	271	compoff = m->m_pkthdr.len - plen;
	272
	273	/*
	274	* grow the mbuf to accomodate ipcomp header.
	275	* before: IP ... payload
	276	* after: IP ... ipcomp payload
	277	*/
	278	if (M_LEADINGSPACE(md) < complen) {
	279	MGET(n, M_DONTWAIT, MT_DATA);
	280	if (!n) {
	281	m_freem(m);
	282	error = ENOBUFS;
	283	goto fail;
	284	}
	285	n->m_len = complen;
	286	mprev->m_next = n;
	287	n->m_next = md;
	288	m->m_pkthdr.len += complen;
	289	ipcomp = mtod(n, struct ipcomp *);
	290	} else {
	291	md->m_len += complen;
	292	md->m_data -= complen;
	293	m->m_pkthdr.len += complen;
	294	ipcomp = mtod(md, struct ipcomp *);
	295	}
	296
	297	bzero(ipcomp, sizeof(*ipcomp));
	298	ipcomp->comp_nxt = *nexthdrp;
	299	*nexthdrp = IPPROTO_IPCOMP;
300	ipcomp->comp_cpi = htons(cpi);
301	switch (af) {
302	#if INET
303	case AF_INET:
304	if (compoff + complen + plen < IP_MAXPACKET)
305	ip->ip_len = htons(compoff + complen + plen);
306	else {
307	ipseclog((LOG_ERR,
308	"IPv4 ESP output: size exceeds limit\n"));
2d21ac55	309	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
1c79356b A	310	m_freem(m);
	311	error = EMSGSIZE;
	312	goto fail;
	313	}
	314	break;
	315	#endif
	316	#if INET6
	317	case AF_INET6:
	318	/* total packet length will be computed in ip6_output() */
	319	break;
	320	#endif
	321	}
	322	}
	323
	324	if (!m) {
	325	ipseclog((LOG_DEBUG,
	326	"NULL mbuf after compression in ipcomp%d_output",
	327	afnumber));
2d21ac55	328	IPSEC_STAT_INCREMENT(stat->out_inval);
1c79356b	329	}
2d21ac55	330	IPSEC_STAT_INCREMENT(stat->out_success);
9bccf70c A	331
	332	/* compute byte lifetime against original packet */
	333	key_sa_recordxfer(sav, mcopy);
	334	m_freem(mcopy);
	335
1c79356b A	336	return 0;
	337
	338	fail:
	339	#if 1
	340	return error;
	341	#else
	342	panic("something bad in ipcomp_output");
	343	#endif
	344	}
	345
	346	#if INET
	347	int
2d21ac55	348	ipcomp4_output(m, sav)
1c79356b	349	struct mbuf *m;
2d21ac55	350	struct secasvar *sav;
1c79356b A	351	{
	352	struct ip *ip;
	353	if (m->m_len < sizeof(struct ip)) {
	354	ipseclog((LOG_DEBUG, "ipcomp4_output: first mbuf too short\n"));
2d21ac55	355	IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
1c79356b	356	m_freem(m);
9bccf70c	357	return 0;
1c79356b A	358	}
	359	ip = mtod(m, struct ip *);
	360	/* XXX assumes that m->m_next points to payload */
2d21ac55	361	return ipcomp_output(m, &ip->ip_p, m->m_next, AF_INET, sav);
1c79356b A	362	}
	363	#endif /INET/
	364
2d21ac55	365	#if INET6
1c79356b	366	int
2d21ac55	367	ipcomp6_output(m, nexthdrp, md, sav)
1c79356b A	368	struct mbuf *m;
	369	u_char *nexthdrp;
	370	struct mbuf *md;
2d21ac55	371	struct secasvar *sav;
1c79356b A	372	{
	373	if (m->m_len < sizeof(struct ip6_hdr)) {
	374	ipseclog((LOG_DEBUG, "ipcomp6_output: first mbuf too short\n"));
2d21ac55	375	IPSEC_STAT_INCREMENT(ipsec6stat.out_inval);
1c79356b	376	m_freem(m);
9bccf70c	377	return 0;
1c79356b	378	}
2d21ac55	379	return ipcomp_output(m, nexthdrp, md, AF_INET6, sav);
1c79356b A	380	}
1c79356b A	381	#endif /INET6/