380 lines
9.0 KiB
C
380 lines
9.0 KiB
C
/* $NetBSD: ipcomp_input.c,v 1.36 2008/05/05 13:41:30 ad Exp $ */
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/* $KAME: ipcomp_input.c,v 1.29 2001/09/04 08:43:19 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 <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipcomp_input.c,v 1.36 2008/05/05 13:41:30 ad Exp $");
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#include "opt_inet.h"
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#include "opt_ipsec.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 <sys/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/in_proto.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 <netinet6/ipsec_private.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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/*#define IPLEN_FLIPPED*/
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#ifdef INET
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void
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ipcomp4_init(void)
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{
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ipsec4_init();
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}
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void
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#if __STDC__
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ipcomp4_input(struct mbuf *m, ...)
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#else
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ipcomp4_input(m, va_alist)
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struct mbuf *m;
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va_dcl
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#endif
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{
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struct mbuf *md;
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struct ip *ip;
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struct ipcomp *ipcomp;
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const struct ipcomp_algorithm *algo;
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u_int16_t cpi; /* host order */
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u_int16_t nxt;
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size_t hlen;
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int error;
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size_t newlen, olen;
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struct secasvar *sav = NULL;
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int off, proto;
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va_list ap;
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u_int16_t sport = 0;
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u_int16_t dport = 0;
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#ifdef IPSEC_NAT_T
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struct m_tag *tag = NULL;
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#endif
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va_start(ap, m);
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off = va_arg(ap, int);
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proto = va_arg(ap, int);
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va_end(ap);
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if (m->m_pkthdr.len < off + sizeof(struct ipcomp)) {
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ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
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"(packet too short)\n"));
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IPSEC_STATINC(IPSEC_STAT_IN_INVAL);
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goto fail;
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}
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#ifdef IPSEC_NAT_T
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/* find the source port for NAT-T */
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if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL)) != NULL) {
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sport = ((u_int16_t *)(tag + 1))[0];
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dport = ((u_int16_t *)(tag + 1))[1];
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}
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#endif
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md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
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if (!md) {
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m = NULL; /* already freed */
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ipseclog((LOG_DEBUG, "IPv4 IPComp input: assumption failed "
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"(pulldown failure)\n"));
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IPSEC_STATINC(IPSEC_STAT_IN_INVAL);
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goto fail;
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}
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ipcomp = mtod(md, struct ipcomp *);
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ip = mtod(m, struct ip *);
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nxt = ipcomp->comp_nxt;
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hlen = ip->ip_hl << 2;
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cpi = ntohs(ipcomp->comp_cpi);
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if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
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sav = key_allocsa(AF_INET, (void *)&ip->ip_src,
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(void *)&ip->ip_dst, IPPROTO_IPCOMP, htonl(cpi),
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sport, dport);
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if (sav != NULL &&
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(sav->state == SADB_SASTATE_MATURE ||
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sav->state == SADB_SASTATE_DYING)) {
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cpi = sav->alg_enc; /* XXX */
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/* other parameters to look at? */
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}
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}
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algo = ipcomp_algorithm_lookup(cpi);
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if (!algo) {
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ipseclog((LOG_WARNING, "IPv4 IPComp input: unknown cpi %u\n",
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cpi));
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IPSEC_STATINC(IPSEC_STAT_IN_NOSA);
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goto fail;
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}
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/* chop ipcomp header */
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ipcomp = NULL;
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md->m_data += sizeof(struct ipcomp);
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md->m_len -= sizeof(struct ipcomp);
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m->m_pkthdr.len -= sizeof(struct ipcomp);
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#ifdef IPLEN_FLIPPED
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ip->ip_len -= sizeof(struct ipcomp);
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#else
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ip->ip_len = htons(ntohs(ip->ip_len) - sizeof(struct ipcomp));
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#endif
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olen = m->m_pkthdr.len;
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newlen = m->m_pkthdr.len - off;
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error = (*algo->decompress)(m, m->m_next, &newlen);
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if (error != 0) {
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if (error == EINVAL)
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IPSEC_STATINC(IPSEC_STAT_IN_INVAL);
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else if (error == ENOBUFS)
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IPSEC_STATINC(IPSEC_STAT_IN_NOMEM);
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m = NULL;
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goto fail;
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}
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IPSEC_STATINC(IPSEC_STAT_IN_COMPHIST + cpi);
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/*
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* returning decompressed packet onto icmp is meaningless.
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* mark it decrypted to prevent icmp from attaching original packet.
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*/
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m->m_flags |= M_DECRYPTED;
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m->m_pkthdr.len = off + newlen;
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ip = mtod(m, struct ip *);
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{
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size_t len;
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#ifdef IPLEN_FLIPPED
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len = ip->ip_len;
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#else
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len = ntohs(ip->ip_len);
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#endif
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/*
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* be careful about underflow. also, do not assign exact value
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* as ip_len is manipulated differently on *BSDs.
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*/
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len += m->m_pkthdr.len;
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len -= olen;
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if (len & ~0xffff) {
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/* packet too big after decompress */
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IPSEC_STATINC(IPSEC_STAT_IN_INVAL);
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goto fail;
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}
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#ifdef IPLEN_FLIPPED
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ip->ip_len = len & 0xffff;
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#else
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ip->ip_len = htons(len & 0xffff);
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#endif
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ip->ip_p = nxt;
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}
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if (sav) {
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key_sa_recordxfer(sav, m);
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if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
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IPSEC_STATINC(IPSEC_STAT_IN_NOMEM);
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goto fail;
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}
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key_freesav(sav);
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sav = NULL;
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}
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if (nxt != IPPROTO_DONE) {
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if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
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ipsec4_in_reject(m, NULL)) {
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IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
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goto fail;
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}
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(*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
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} else
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m_freem(m);
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m = NULL;
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IPSEC_STATINC(IPSEC_STAT_IN_SUCCESS);
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return;
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fail:
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if (sav)
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key_freesav(sav);
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if (m)
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m_freem(m);
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return;
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}
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#endif /* INET */
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#ifdef INET6
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void
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ipcomp6_init(void)
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{
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ipsec6_init();
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}
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int
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ipcomp6_input(struct mbuf **mp, int *offp, int proto)
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{
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struct mbuf *m, *md;
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int off;
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struct ip6_hdr *ip6;
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struct ipcomp *ipcomp;
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const struct ipcomp_algorithm *algo;
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u_int16_t cpi; /* host order */
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u_int16_t nxt;
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int error;
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size_t newlen;
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struct secasvar *sav = NULL;
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u_int8_t *prvnxtp;
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m = *mp;
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off = *offp;
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md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
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if (!md) {
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m = NULL; /* already freed */
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ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
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"(pulldown failure)\n"));
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IPSEC6_STATINC(IPSEC_STAT_IN_INVAL);
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goto fail;
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}
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ipcomp = mtod(md, struct ipcomp *);
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ip6 = mtod(m, struct ip6_hdr *);
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nxt = ipcomp->comp_nxt;
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cpi = ntohs(ipcomp->comp_cpi);
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if (cpi >= IPCOMP_CPI_NEGOTIATE_MIN) {
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sav = key_allocsa(AF_INET6, (void *)&ip6->ip6_src,
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(void *)&ip6->ip6_dst, IPPROTO_IPCOMP,
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htonl(cpi), 0, 0);
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if (sav != NULL &&
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(sav->state == SADB_SASTATE_MATURE ||
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sav->state == SADB_SASTATE_DYING)) {
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cpi = sav->alg_enc; /* XXX */
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/* other parameters to look at? */
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}
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}
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algo = ipcomp_algorithm_lookup(cpi);
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if (!algo) {
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ipseclog((LOG_WARNING, "IPv6 IPComp input: unknown cpi %u; "
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"dropping the packet for simplicity\n", cpi));
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IPSEC6_STATINC(IPSEC_STAT_IN_NOSA);
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goto fail;
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}
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/* chop ipcomp header */
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ipcomp = NULL;
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md->m_data += sizeof(struct ipcomp);
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md->m_len -= sizeof(struct ipcomp);
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m->m_pkthdr.len -= sizeof(struct ipcomp);
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newlen = m->m_pkthdr.len - off;
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error = (*algo->decompress)(m, md, &newlen);
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if (error != 0) {
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if (error == EINVAL)
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IPSEC6_STATINC(IPSEC_STAT_IN_INVAL);
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else if (error == ENOBUFS)
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IPSEC6_STATINC(IPSEC_STAT_IN_NOMEM);
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m = NULL;
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goto fail;
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}
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IPSEC6_STATINC(IPSEC_STAT_IN_COMPHIST + cpi);
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m->m_pkthdr.len = off + newlen;
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/*
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* returning decompressed packet onto icmp is meaningless.
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* mark it decrypted to prevent icmp from attaching original packet.
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*/
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m->m_flags |= M_DECRYPTED;
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/* update next header field */
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prvnxtp = ip6_get_prevhdr(m, off);
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*prvnxtp = nxt;
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/*
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* no need to adjust payload length, as all the IPv6 protocols
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* look at m->m_pkthdr.len
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*/
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if (sav) {
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key_sa_recordxfer(sav, m);
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if (ipsec_addhist(m, IPPROTO_IPCOMP, (u_int32_t)cpi) != 0) {
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IPSEC6_STATINC(IPSEC_STAT_IN_NOMEM);
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goto fail;
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}
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key_freesav(sav);
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sav = NULL;
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}
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*offp = off;
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*mp = m;
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IPSEC6_STATINC(IPSEC_STAT_IN_SUCCESS);
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return nxt;
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fail:
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if (m)
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m_freem(m);
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if (sav)
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key_freesav(sav);
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return IPPROTO_DONE;
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}
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#endif /* INET6 */
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