379 lines
8.7 KiB
C
379 lines
8.7 KiB
C
/* $NetBSD: ipcomp_output.c,v 1.14 2000/10/02 03:55:43 itojun Exp $ */
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/* $KAME: ipcomp_output.c,v 1.20 2000/10/01 12:37:20 itojun Exp $ */
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/*
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* Copyright (C) 1999 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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* RFC2393 IP payload compression protocol (IPComp).
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*/
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/netisr.h>
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#include <net/zlib.h>
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#include <machine/cpu.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#endif
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#include <netinet6/ipcomp.h>
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#include <netinet6/ipsec.h>
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#include <netkey/key.h>
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#include <netkey/keydb.h>
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#include <machine/stdarg.h>
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#include <net/net_osdep.h>
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static int ipcomp_output __P((struct mbuf *, u_char *, struct mbuf *,
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struct ipsecrequest *, int));
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/*
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* Modify the packet so that the payload is compressed.
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* The mbuf (m) must start with IPv4 or IPv6 header.
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* On failure, free the given mbuf and return non-zero.
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*
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* on invocation:
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* m nexthdrp md
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* v v v
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* IP ......... payload
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* during the encryption:
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* m nexthdrp mprev md
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* v v v v
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* IP ............... ipcomp payload
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* <-----><----->
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* complen plen
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* <-> hlen
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* <-----------------> compoff
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*/
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static int
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ipcomp_output(m, nexthdrp, md, isr, af)
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struct mbuf *m;
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u_char *nexthdrp;
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struct mbuf *md;
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struct ipsecrequest *isr;
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int af;
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{
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struct mbuf *n;
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struct mbuf *md0;
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struct mbuf *mcopy;
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struct mbuf *mprev;
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struct ipcomp *ipcomp;
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struct secasvar *sav = isr->sav;
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const struct ipcomp_algorithm *algo;
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u_int16_t cpi; /* host order */
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size_t plen0, plen; /*payload length to be compressed*/
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size_t compoff;
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int afnumber;
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int error = 0;
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struct ipsecstat *stat;
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switch (af) {
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#ifdef INET
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case AF_INET:
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afnumber = 4;
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stat = &ipsecstat;
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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afnumber = 6;
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stat = &ipsec6stat;
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break;
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#endif
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default:
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ipseclog((LOG_ERR, "ipcomp_output: unsupported af %d\n", af));
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return 0; /* no change at all */
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}
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/* grab parameters */
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algo = ipcomp_algorithm_lookup(sav->alg_enc);
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if ((ntohl(sav->spi) & ~0xffff) != 0 || !algo) {
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stat->out_inval++;
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m_freem(m);
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return EINVAL;
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}
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if ((sav->flags & SADB_X_EXT_RAWCPI) == 0)
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cpi = sav->alg_enc;
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else
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cpi = ntohl(sav->spi) & 0xffff;
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/* compute original payload length */
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plen = 0;
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for (n = md; n; n = n->m_next)
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plen += n->m_len;
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/* if the payload is short enough, we don't need to compress */
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if (plen < algo->minplen)
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return 0;
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/*
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* retain the original packet for two purposes:
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* (1) we need to backout our changes when compression is not necessary.
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* (2) byte lifetime computation should use the original packet.
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* see RFC2401 page 23.
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* compromise two m_copym(). we will be going through every byte of
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* the payload during compression process anyways.
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*/
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mcopy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
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if (mcopy == NULL) {
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error = ENOBUFS;
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return 0;
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}
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md0 = m_copym(md, 0, M_COPYALL, M_NOWAIT);
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if (md0 == NULL) {
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m_freem(mcopy);
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error = ENOBUFS;
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return 0;
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}
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plen0 = plen;
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/* make the packet over-writable */
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for (mprev = m; mprev && mprev->m_next != md; mprev = mprev->m_next)
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;
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if (mprev == NULL || mprev->m_next != md) {
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ipseclog((LOG_DEBUG, "ipcomp%d_output: md is not in chain\n",
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afnumber));
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stat->out_inval++;
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m_freem(m);
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m_freem(md0);
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m_freem(mcopy);
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return EINVAL;
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}
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mprev->m_next = NULL;
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if ((md = ipsec_copypkt(md)) == NULL) {
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m_freem(m);
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m_freem(md0);
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m_freem(mcopy);
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error = ENOBUFS;
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goto fail;
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}
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mprev->m_next = md;
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/* compress data part */
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if ((*algo->compress)(m, md, &plen) || mprev->m_next == NULL) {
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ipseclog((LOG_ERR, "packet compression failure\n"));
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m = NULL;
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m_freem(md0);
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m_freem(mcopy);
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stat->out_inval++;
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error = EINVAL;
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goto fail;
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}
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stat->out_comphist[sav->alg_enc]++;
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md = mprev->m_next;
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/*
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* if the packet became bigger, meaningless to use IPComp.
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* we've only wasted our cpu time.
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*/
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if (plen0 < plen) {
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m_freem(md);
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m_freem(mcopy);
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mprev->m_next = md0;
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return 0;
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}
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/*
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* no need to backout change beyond here.
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*/
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m_freem(md0);
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md0 = NULL;
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m->m_pkthdr.len -= plen0;
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m->m_pkthdr.len += plen;
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{
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/*
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* insert IPComp header.
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*/
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#ifdef INET
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struct ip *ip = NULL;
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#endif
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL;
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#endif
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size_t hlen = 0; /*ip header len*/
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size_t complen = sizeof(struct ipcomp);
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switch (af) {
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#ifdef INET
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case AF_INET:
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ip = mtod(m, struct ip *);
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#ifdef _IP_VHL
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hlen = IP_VHL_HL(ip->ip_vhl) << 2;
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#else
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hlen = ip->ip_hl << 2;
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#endif
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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ip6 = mtod(m, struct ip6_hdr *);
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hlen = sizeof(*ip6);
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break;
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#endif
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}
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compoff = m->m_pkthdr.len - plen;
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/*
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* grow the mbuf to accomodate ipcomp header.
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* before: IP ... payload
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* after: IP ... ipcomp payload
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*/
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if (M_LEADINGSPACE(md) < complen) {
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MGET(n, M_DONTWAIT, MT_DATA);
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if (!n) {
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m_freem(m);
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error = ENOBUFS;
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goto fail;
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}
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n->m_len = complen;
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mprev->m_next = n;
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n->m_next = md;
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m->m_pkthdr.len += complen;
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ipcomp = mtod(n, struct ipcomp *);
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} else {
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md->m_len += complen;
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md->m_data -= complen;
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m->m_pkthdr.len += complen;
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ipcomp = mtod(md, struct ipcomp *);
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}
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bzero(ipcomp, sizeof(*ipcomp));
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ipcomp->comp_nxt = *nexthdrp;
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*nexthdrp = IPPROTO_IPCOMP;
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ipcomp->comp_cpi = htons(cpi);
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switch (af) {
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#ifdef INET
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case AF_INET:
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if (compoff + complen + plen < IP_MAXPACKET)
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ip->ip_len = htons(compoff + complen + plen);
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else {
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ipseclog((LOG_ERR,
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"IPv4 ESP output: size exceeds limit\n"));
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ipsecstat.out_inval++;
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m_freem(m);
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error = EMSGSIZE;
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goto fail;
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}
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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/* total packet length will be computed in ip6_output() */
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break;
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#endif
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}
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}
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if (!m) {
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ipseclog((LOG_DEBUG,
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"NULL mbuf after compression in ipcomp%d_output",
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afnumber));
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stat->out_inval++;
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}
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stat->out_success++;
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/* compute byte lifetime against original packet */
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key_sa_recordxfer(sav, mcopy);
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m_freem(mcopy);
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return 0;
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fail:
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#if 1
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return error;
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#else
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panic("something bad in ipcomp_output");
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#endif
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}
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#ifdef INET
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int
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ipcomp4_output(m, isr)
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struct mbuf *m;
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struct ipsecrequest *isr;
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{
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struct ip *ip;
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if (m->m_len < sizeof(struct ip)) {
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ipseclog((LOG_DEBUG, "ipcomp4_output: first mbuf too short\n"));
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ipsecstat.out_inval++;
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m_freem(m);
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return 0;
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}
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ip = mtod(m, struct ip *);
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/* XXX assumes that m->m_next points to payload */
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return ipcomp_output(m, &ip->ip_p, m->m_next, isr, AF_INET);
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}
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#endif /*INET*/
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#ifdef INET6
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int
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ipcomp6_output(m, nexthdrp, md, isr)
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struct mbuf *m;
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u_char *nexthdrp;
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struct mbuf *md;
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struct ipsecrequest *isr;
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{
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if (m->m_len < sizeof(struct ip6_hdr)) {
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ipseclog((LOG_DEBUG, "ipcomp6_output: first mbuf too short\n"));
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ipsec6stat.out_inval++;
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m_freem(m);
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return 0;
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}
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return ipcomp_output(m, nexthdrp, md, isr, AF_INET6);
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}
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#endif /*INET6*/
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