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

/*	$KAME: ipcomp_output.c,v 1.11 2000/02/22 14:04:23 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).
 */

#define _IP_VHL
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#endif

#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 <net/netisr.h>
#include <net/zlib.h>
#include <kern/cpu_number.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>

#include <netinet6/ipsec.h>
#include <netkey/key.h>
#include <netkey/keydb.h>
#include <netkey/key_debug.h>

#include <net/net_osdep.h>

static int ipcomp_output __P((struct mbuf *, u_char *, struct mbuf *,
	struct ipsecrequest *, int));

/*
 * 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 NULL.
 *
 * 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, isr, af)
	struct mbuf *m;
	u_char *nexthdrp;
	struct mbuf *md;
	struct ipsecrequest *isr;
	int af;
{
	struct mbuf *n;
	struct mbuf *md0;
	struct mbuf *mprev;
	struct ipcomp *ipcomp;
	struct secasvar *sav = isr->sav;
	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;

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

	/* grab parameters */
	if ((ntohl(sav->spi) & ~0xffff) != 0 || sav->alg_enc >= IPCOMP_MAX
	 || ipcomp_algorithms[sav->alg_enc].compress == NULL) {
		ipsecstat.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;
	algo = &ipcomp_algorithms[sav->alg_enc];	/*XXX*/

	/* 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;

	/*
	 * keep the original data packet, so that we can backout
	 * our changes when compression is not necessary.
	 */
	md0 = m_copym(md, 0, M_COPYALL, M_NOWAIT);
	if (md0 == NULL) {
		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));
		switch (af) {
#if INET
		case AF_INET:
			ipsecstat.out_inval++;
			break;
#endif
#if INET6
		case AF_INET6:
			ipsec6stat.out_inval++;
			break;
#endif
		}
		m_freem(m);
		m_freem(md0);
		return EINVAL;
	}
	mprev->m_next = NULL;
	if ((md = ipsec_copypkt(md)) == NULL) {
		m_freem(m);
		m_freem(md0);
		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);
		switch (af) {
#if INET
		case AF_INET:
			ipsecstat.out_inval++;
			break;
#endif
#if INET6
		case AF_INET6:
			ipsec6stat.out_inval++;
			break;
#endif
		}
		error = EINVAL;
		goto fail;
	}
	switch (af) {
#if INET
	case AF_INET:
		ipsecstat.out_comphist[sav->alg_enc]++;
		break;
#endif
#if INET6
	case AF_INET6:
		ipsec6stat.out_comphist[sav->alg_enc]++;
		break;
#endif
	}
	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);
		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"));
			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));
		switch (af) {
#if INET
		case AF_INET:
			ipsecstat.out_inval++;
			break;
#endif
#if INET6
		case AF_INET6:
			ipsec6stat.out_inval++;
			break;
#endif
		}
	} else {
		switch (af) {
#if INET
		case AF_INET:
			ipsecstat.out_success++;
			break;
#endif
#if INET6
		case AF_INET6:
			ipsec6stat.out_success++;
			break;
#endif
		}
	}
#if 0
	switch (af) {
#if INET
	case AF_INET:
		ipsecstat.out_esphist[sav->alg_enc]++;
		break;
#endif
#if INET6
	case AF_INET6:
		ipsec6stat.out_esphist[sav->alg_enc]++;
		break;
#endif
	}
#endif
	key_sa_recordxfer(sav, m);
	return 0;

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

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

#if INET6
int
ipcomp6_output(m, nexthdrp, md, isr)
	struct mbuf *m;
	u_char *nexthdrp;
	struct mbuf *md;
	struct ipsecrequest *isr;
{
	if (m->m_len < sizeof(struct ip6_hdr)) {
		ipseclog((LOG_DEBUG, "ipcomp6_output: first mbuf too short\n"));
		ipsec6stat.out_inval++;
		m_freem(m);
		return NULL;
	}
	return ipcomp_output(m, nexthdrp, md, isr, AF_INET6);
}
#endif /*INET6*/
Commit	Line	Data
1c79356b A	1	/* $KAME: ipcomp_output.c,v 1.11 2000/02/22 14:04:23 itojun Exp $ */
	2
	3	/*
	4	* Copyright (C) 1999 WIDE Project.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of the project nor the names of its contributors
	16	* may be used to endorse or promote products derived from this software
	17	* without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	* SUCH DAMAGE.
	30	*/
	31
	32	/*
	33	* RFC2393 IP payload compression protocol (IPComp).
	34	*/
	35
	36	#define _IP_VHL
	37	#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) \|\| defined(__NetBSD__)
	38	#include "opt_inet.h"
	39	#endif
	40
	41	#include <sys/param.h>
	42	#include <sys/systm.h>
	43	#include <sys/malloc.h>
	44	#include <sys/mbuf.h>
	45	#include <sys/domain.h>
	46	#include <sys/protosw.h>
	47	#include <sys/socket.h>
	48	#include <sys/errno.h>
	49	#include <sys/time.h>
	50	#include <sys/kernel.h>
	51	#include <sys/syslog.h>
	52
	53	#include <net/if.h>
	54	#include <net/route.h>
	55	#include <net/netisr.h>
	56	#include <net/zlib.h>
	57	#include <kern/cpu_number.h>
	58
	59	#include <netinet/in.h>
	60	#include <netinet/in_systm.h>
	61	#include <netinet/in_var.h>
	62	#include <netinet/ip.h>
	63	#include <netinet/ip_var.h>
	64	#include <netinet/ip_ecn.h>
65
66	#if INET6
67	#include <netinet/ip6.h>
68	#include <netinet6/ip6_var.h>
69	#endif
70	#include <netinet6/ipcomp.h>
71
72	#include <netinet6/ipsec.h>
73	#include <netkey/key.h>
74	#include <netkey/keydb.h>
75	#include <netkey/key_debug.h>
76
77	#include <net/net_osdep.h>
78
79	static int ipcomp_output __P((struct mbuf , u_char , struct mbuf *,
80	struct ipsecrequest *, int));
81
82	/*
83	* Modify the packet so that the payload is compressed.
84	* The mbuf (m) must start with IPv4 or IPv6 header.
85	* On failure, free the given mbuf and return NULL.
86	*
87	* on invocation:
88	* m nexthdrp md
89	* v v v
90	* IP ......... payload
91	* during the encryption:
92	* m nexthdrp mprev md
93	* v v v v
94	* IP ............... ipcomp payload
95	* <-----><----->
96	* complen plen
97	* <-> hlen
98	* <-----------------> compoff
99	*/
100	static int
101	ipcomp_output(m, nexthdrp, md, isr, af)
102	struct mbuf *m;
103	u_char *nexthdrp;
104	struct mbuf *md;
105	struct ipsecrequest *isr;
106	int af;
107	{
108	struct mbuf *n;
109	struct mbuf *md0;
110	struct mbuf *mprev;
111	struct ipcomp *ipcomp;
112	struct secasvar *sav = isr->sav;
113	struct ipcomp_algorithm *algo;
114	u_int16_t cpi; /* host order */
115	size_t plen0, plen; /payload length to be compressed/
116	size_t compoff;
117	int afnumber;
118	int error = 0;
119
120	switch (af) {
121	#if INET
122	case AF_INET:
123	afnumber = 4;
124	break;
125	#endif
126	#if INET6
127	case AF_INET6:
128	afnumber = 6;
129	break;
130	#endif
131	default:
132	ipseclog((LOG_ERR, "ipcomp_output: unsupported af %d\n", af));
133	return 0; /* no change at all */
134	}
135
136	/* grab parameters */
137	if ((ntohl(sav->spi) & ~0xffff) != 0 \|\| sav->alg_enc >= IPCOMP_MAX
138	\|\| ipcomp_algorithms[sav->alg_enc].compress == NULL) {
139	ipsecstat.out_inval++;
140	m_freem(m);
141	return EINVAL;
142	}
143	if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
144	cpi = sav->alg_enc;
145	else
146	cpi = ntohl(sav->spi) & 0xffff;
147	algo = &ipcomp_algorithms[sav->alg_enc]; /XXX/
148
149	/* compute original payload length */
150	plen = 0;
151	for (n = md; n; n = n->m_next)
152	plen += n->m_len;
153
154	/* if the payload is short enough, we don't need to compress */
155	if (plen < algo->minplen)
156	return 0;
157
158	/*
159	* keep the original data packet, so that we can backout
160	* our changes when compression is not necessary.
161	*/
162	md0 = m_copym(md, 0, M_COPYALL, M_NOWAIT);
163	if (md0 == NULL) {
164	error = ENOBUFS;
165	return 0;
166	}
167	plen0 = plen;
168
169	/* make the packet over-writable */
170	for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
171	;
172	if (mprev == NULL \|\| mprev->m_next != md) {
173	ipseclog((LOG_DEBUG, "ipcomp%d_output: md is not in chain\n",
174	afnumber));
175	switch (af) {
176	#if INET
177	case AF_INET:
178	ipsecstat.out_inval++;
179	break;
180	#endif
181	#if INET6
182	case AF_INET6:
183	ipsec6stat.out_inval++;
184	break;
185	#endif
186	}
187	m_freem(m);
188	m_freem(md0);
189	return EINVAL;
190	}
191	mprev->m_next = NULL;
192	if ((md = ipsec_copypkt(md)) == NULL) {
193	m_freem(m);
194	m_freem(md0);
195	error = ENOBUFS;
196	goto fail;
197	}
198	mprev->m_next = md;
199
200	/* compress data part */
201	if ((*algo->compress)(m, md, &plen) \|\| mprev->m_next == NULL) {
202	ipseclog((LOG_ERR, "packet compression failure\n"));
203	m = NULL;
204	m_freem(md0);
205	switch (af) {
206	#if INET
207	case AF_INET:
208	ipsecstat.out_inval++;
209	break;
210	#endif
211	#if INET6
212	case AF_INET6:
213	ipsec6stat.out_inval++;
214	break;
215	#endif
216	}
217	error = EINVAL;
218	goto fail;
219	}
220	switch (af) {
221	#if INET
222	case AF_INET:
223	ipsecstat.out_comphist[sav->alg_enc]++;
224	break;
225	#endif
226	#if INET6
227	case AF_INET6:
228	ipsec6stat.out_comphist[sav->alg_enc]++;
229	break;
230	#endif
231	}
232	md = mprev->m_next;
233
234	/*
235	* if the packet became bigger, meaningless to use IPComp.
236	* we've only wasted our cpu time.
237	*/
238	if (plen0 < plen) {
239	m_freem(md);
240	mprev->m_next = md0;
241	return 0;
242	}
243
244	/* no need to backout change beyond here */
245	m_freem(md0);
246	md0 = NULL;
247	m->m_pkthdr.len -= plen0;
248	m->m_pkthdr.len += plen;
249
250	{
251	/*
252	* insert IPComp header.
253	*/
254	#if INET
255	struct ip *ip = NULL;
256	#endif
257	#if INET6
258	struct ip6_hdr *ip6 = NULL;
259	#endif
260	size_t hlen = 0; /ip header len/
261	size_t complen = sizeof(struct ipcomp);
262
263	switch (af) {
264	#if INET
265	case AF_INET:
266	ip = mtod(m, struct ip *);
267	#ifdef _IP_VHL
268	hlen = IP_VHL_HL(ip->ip_vhl) << 2;
269	#else
270	hlen = ip->ip_hl << 2;
271	#endif
272	break;
273	#endif
274	#if INET6
275	case AF_INET6:
276	ip6 = mtod(m, struct ip6_hdr *);
277	hlen = sizeof(*ip6);
278	break;
279	#endif
280	}
281
282	compoff = m->m_pkthdr.len - plen;
283
284	/*
285	* grow the mbuf to accomodate ipcomp header.
286	* before: IP ... payload
287	* after: IP ... ipcomp payload
288	*/
289	if (M_LEADINGSPACE(md) < complen) {
290	MGET(n, M_DONTWAIT, MT_DATA);
291	if (!n) {
292	m_freem(m);
293	error = ENOBUFS;
294	goto fail;
295	}
296	n->m_len = complen;
297	mprev->m_next = n;
298	n->m_next = md;
299	m->m_pkthdr.len += complen;
300	ipcomp = mtod(n, struct ipcomp *);
301	} else {
302	md->m_len += complen;
303	md->m_data -= complen;
304	m->m_pkthdr.len += complen;
305	ipcomp = mtod(md, struct ipcomp *);
306	}
307
308	bzero(ipcomp, sizeof(*ipcomp));
309	ipcomp->comp_nxt = *nexthdrp;
310	*nexthdrp = IPPROTO_IPCOMP;
311	ipcomp->comp_cpi = htons(cpi);
312	switch (af) {
313	#if INET
314	case AF_INET:
315	if (compoff + complen + plen < IP_MAXPACKET)
316	ip->ip_len = htons(compoff + complen + plen);
317	else {
318	ipseclog((LOG_ERR,
319	"IPv4 ESP output: size exceeds limit\n"));
320	ipsecstat.out_inval++;
321	m_freem(m);
322	error = EMSGSIZE;
323	goto fail;
324	}
325	break;
326	#endif
327	#if INET6
328	case AF_INET6:
329	/* total packet length will be computed in ip6_output() */
330	break;
331	#endif
332	}
333	}
334
335	if (!m) {
336	ipseclog((LOG_DEBUG,
337	"NULL mbuf after compression in ipcomp%d_output",
338	afnumber));
339	switch (af) {
340	#if INET
341	case AF_INET:
342	ipsecstat.out_inval++;
343	break;
344	#endif
345	#if INET6
346	case AF_INET6:
347	ipsec6stat.out_inval++;
348	break;
349	#endif
350	}
351	} else {
352	switch (af) {
353	#if INET
354	case AF_INET:
355	ipsecstat.out_success++;
356	break;
357	#endif
358	#if INET6
359	case AF_INET6:
360	ipsec6stat.out_success++;
361	break;
362	#endif
363	}
364	}
365	#if 0
366	switch (af) {
367	#if INET
368	case AF_INET:
369	ipsecstat.out_esphist[sav->alg_enc]++;
370	break;
371	#endif
372	#if INET6
373	case AF_INET6:
374	ipsec6stat.out_esphist[sav->alg_enc]++;
375	break;
376	#endif
377	}
378	#endif
379	key_sa_recordxfer(sav, m);
380	return 0;
381
382	fail:
383	#if 1
384	return error;
385	#else
386	panic("something bad in ipcomp_output");
387	#endif
388	}
389
390	#if INET
391	int
392	ipcomp4_output(m, isr)
393	struct mbuf *m;
394	struct ipsecrequest *isr;
395	{
396	struct ip *ip;
397	if (m->m_len < sizeof(struct ip)) {
398	ipseclog((LOG_DEBUG, "ipcomp4_output: first mbuf too short\n"));
399	ipsecstat.out_inval++;
400	m_freem(m);
401	return NULL;
402	}
403	ip = mtod(m, struct ip *);
404	/* XXX assumes that m->m_next points to payload */
405	return ipcomp_output(m, &ip->ip_p, m->m_next, isr, AF_INET);
406	}
407	#endif /INET/
408
409	#if INET6
410	int
411	ipcomp6_output(m, nexthdrp, md, isr)
412	struct mbuf *m;
413	u_char *nexthdrp;
414	struct mbuf *md;
415	struct ipsecrequest *isr;
416	{
417	if (m->m_len < sizeof(struct ip6_hdr)) {
418	ipseclog((LOG_DEBUG, "ipcomp6_output: first mbuf too short\n"));
419	ipsec6stat.out_inval++;
420	m_freem(m);
421	return NULL;
422	}
423	return ipcomp_output(m, nexthdrp, md, isr, AF_INET6);
424	}
425	#endif /INET6/