385 lines
8.7 KiB
C
385 lines
8.7 KiB
C
/* $FreeBSD$ */
|
|
/* $KAME: ipcomp_output.c,v 1.24 2001/07/26 06:53:18 jinmei 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 "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
|
|
#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/syslog.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
#include <net/netisr.h>
|
|
#include <net/zlib.h>
|
|
#include <machine/cpu.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>
|
|
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#endif
|
|
#include <netinet6/ipcomp.h>
|
|
#ifdef INET6
|
|
#include <netinet6/ipcomp6.h>
|
|
#endif
|
|
|
|
#include <netinet6/ipsec.h>
|
|
#ifdef INET6
|
|
#include <netinet6/ipsec6.h>
|
|
#endif
|
|
#include <netkey/key.h>
|
|
#include <netkey/keydb.h>
|
|
|
|
#include <machine/stdarg.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 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, isr, af)
|
|
struct mbuf *m;
|
|
u_char *nexthdrp;
|
|
struct mbuf *md;
|
|
struct ipsecrequest *isr;
|
|
int af;
|
|
{
|
|
struct mbuf *n;
|
|
struct mbuf *md0;
|
|
struct mbuf *mcopy;
|
|
struct mbuf *mprev;
|
|
struct ipcomp *ipcomp;
|
|
struct secasvar *sav = isr->sav;
|
|
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) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
afnumber = 4;
|
|
stat = &ipsecstat;
|
|
break;
|
|
#endif
|
|
#ifdef 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) {
|
|
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));
|
|
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);
|
|
stat->out_inval++;
|
|
error = EINVAL;
|
|
goto fail;
|
|
}
|
|
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.
|
|
*/
|
|
#ifdef INET
|
|
struct ip *ip = NULL;
|
|
#endif
|
|
#ifdef INET6
|
|
struct ip6_hdr *ip6 = NULL;
|
|
#endif
|
|
size_t hlen = 0; /* ip header len */
|
|
size_t complen = sizeof(struct ipcomp);
|
|
|
|
switch (af) {
|
|
#ifdef 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
|
|
#ifdef 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) {
|
|
#ifdef 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
|
|
#ifdef 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));
|
|
stat->out_inval++;
|
|
}
|
|
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
|
|
}
|
|
|
|
#ifdef 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 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, isr, AF_INET);
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef 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 0;
|
|
}
|
|
return ipcomp_output(m, nexthdrp, md, isr, AF_INET6);
|
|
}
|
|
#endif /* INET6 */
|