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df5e198723
before adding/removing packets from the queue. Also, the if_obytes and if_omcasts fields should only be manipulated under protection of the mutex. IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on the queue. An IF_LOCK macro is provided, as well as the old (mutex-less) versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which needs them, but their use is discouraged. Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF, which takes care of locking/enqueue, and also statistics updating/start if necessary.
809 lines
20 KiB
C
809 lines
20 KiB
C
/* $FreeBSD$ */
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/* $KAME: esp_input.c,v 1.25 2000/05/08 08:04:30 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 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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* RFC1827/2406 Encapsulated Security Payload.
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.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/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 <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/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet6/ip6_ecn.h>
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#endif
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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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#include <netinet/icmp6.h>
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#endif
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#include <netinet6/ipsec.h>
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#ifdef INET6
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#include <netinet6/ipsec6.h>
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#endif
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#include <netinet6/ah.h>
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#ifdef INET6
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#include <netinet6/ah6.h>
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#endif
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#include <netinet6/esp.h>
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#ifdef INET6
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#include <netinet6/esp6.h>
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#endif
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#include <netkey/key.h>
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#include <netkey/keydb.h>
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#ifdef IPSEC_DEBUG
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#include <netkey/key_debug.h>
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#else
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#define KEYDEBUG(lev,arg)
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#endif
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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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#include <netinet/ipprotosw.h>
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extern struct ipprotosw inetsw[];
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#define ESPMAXLEN \
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(sizeof(struct esp) < sizeof(struct newesp) \
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? sizeof(struct newesp) : sizeof(struct esp))
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void
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#if __STDC__
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esp4_input(struct mbuf *m, ...)
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#else
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esp4_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 ip *ip;
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struct esp *esp;
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struct esptail esptail;
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u_int32_t spi;
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struct secasvar *sav = NULL;
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size_t taillen;
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u_int16_t nxt;
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struct esp_algorithm *algo;
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int ivlen;
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size_t hlen;
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size_t esplen;
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va_list ap;
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int off, proto;
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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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/* sanity check for alignment. */
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if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
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ipseclog((LOG_ERR, "IPv4 ESP input: packet alignment problem "
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"(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
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ipsecstat.in_inval++;
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goto bad;
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}
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if (m->m_len < off + ESPMAXLEN) {
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m = m_pullup(m, off + ESPMAXLEN);
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if (!m) {
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ipseclog((LOG_DEBUG,
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"IPv4 ESP input: can't pullup in esp4_input\n"));
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ipsecstat.in_inval++;
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goto bad;
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}
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}
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ip = mtod(m, struct ip *);
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esp = (struct esp *)(((u_int8_t *)ip) + off);
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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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/* find the sassoc. */
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spi = esp->esp_spi;
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if ((sav = key_allocsa(AF_INET,
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(caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
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IPPROTO_ESP, spi)) == 0) {
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ipseclog((LOG_WARNING,
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"IPv4 ESP input: no key association found for spi %u\n",
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(u_int32_t)ntohl(spi)));
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ipsecstat.in_nosa++;
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goto bad;
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}
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP esp4_input called to allocate SA:%p\n", sav));
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if (sav->state != SADB_SASTATE_MATURE
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&& sav->state != SADB_SASTATE_DYING) {
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ipseclog((LOG_DEBUG,
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"IPv4 ESP input: non-mature/dying SA found for spi %u\n",
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(u_int32_t)ntohl(spi)));
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ipsecstat.in_badspi++;
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goto bad;
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}
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if (sav->alg_enc == SADB_EALG_NONE) {
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ipseclog((LOG_DEBUG, "IPv4 ESP input: "
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"unspecified encryption algorithm for spi %u\n",
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(u_int32_t)ntohl(spi)));
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ipsecstat.in_badspi++;
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goto bad;
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}
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algo = &esp_algorithms[sav->alg_enc]; /*XXX*/
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/* check if we have proper ivlen information */
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ivlen = sav->ivlen;
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if (ivlen < 0) {
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ipseclog((LOG_ERR, "inproper ivlen in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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ipsecstat.in_inval++;
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goto bad;
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}
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if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
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&& (sav->alg_auth && sav->key_auth)))
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goto noreplaycheck;
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if (sav->alg_auth == SADB_AALG_NULL)
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goto noreplaycheck;
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/*
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* check for sequence number.
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*/
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if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
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; /*okey*/
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else {
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ipsecstat.in_espreplay++;
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ipseclog((LOG_WARNING,
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"replay packet in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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goto bad;
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}
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/* check ICV */
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{
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u_char sum0[AH_MAXSUMSIZE];
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u_char sum[AH_MAXSUMSIZE];
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struct ah_algorithm *sumalgo;
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size_t siz;
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sumalgo = &ah_algorithms[sav->alg_auth];
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siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
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if (AH_MAXSUMSIZE < siz) {
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ipseclog((LOG_DEBUG,
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"internal error: AH_MAXSUMSIZE must be larger than %lu\n",
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(u_long)siz));
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ipsecstat.in_inval++;
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goto bad;
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}
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m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
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if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) {
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ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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ipsecstat.in_espauthfail++;
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goto bad;
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}
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if (bcmp(sum0, sum, siz) != 0) {
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ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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ipsecstat.in_espauthfail++;
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goto bad;
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}
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/* strip off the authentication data */
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m_adj(m, -siz);
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ip = mtod(m, struct ip *);
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#ifdef IPLEN_FLIPPED
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ip->ip_len = ip->ip_len - siz;
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#else
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ip->ip_len = htons(ntohs(ip->ip_len) - siz);
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#endif
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m->m_flags |= M_AUTHIPDGM;
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ipsecstat.in_espauthsucc++;
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}
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/*
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* update sequence number.
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*/
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if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
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if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
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ipsecstat.in_espreplay++;
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goto bad;
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}
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}
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noreplaycheck:
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/* process main esp header. */
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if (sav->flags & SADB_X_EXT_OLD) {
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/* RFC 1827 */
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esplen = sizeof(struct esp);
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} else {
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/* RFC 2406 */
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if (sav->flags & SADB_X_EXT_DERIV)
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esplen = sizeof(struct esp);
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else
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esplen = sizeof(struct newesp);
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}
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if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) {
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ipseclog((LOG_WARNING,
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"IPv4 ESP input: packet too short\n"));
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ipsecstat.in_inval++;
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goto bad;
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}
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if (m->m_len < off + esplen + ivlen) {
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m = m_pullup(m, off + esplen + ivlen);
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if (!m) {
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ipseclog((LOG_DEBUG,
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"IPv4 ESP input: can't pullup in esp4_input\n"));
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ipsecstat.in_inval++;
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goto bad;
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}
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}
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{
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/*
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* decrypt the packet.
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*/
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if (!algo->decrypt)
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panic("internal error: no decrypt function");
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if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
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ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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ipsecstat.in_inval++;
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goto bad;
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}
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ipsecstat.in_esphist[sav->alg_enc]++;
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m->m_flags |= M_DECRYPTED;
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}
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/*
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* find the trailer of the ESP.
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*/
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m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
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(caddr_t)&esptail);
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nxt = esptail.esp_nxt;
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taillen = esptail.esp_padlen + sizeof(esptail);
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if (m->m_pkthdr.len < taillen
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|| m->m_pkthdr.len - taillen < hlen) { /*?*/
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ipseclog((LOG_WARNING,
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"bad pad length in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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ipsecstat.in_inval++;
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goto bad;
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}
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/* strip off the trailing pad area. */
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m_adj(m, -taillen);
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#ifdef IPLEN_FLIPPED
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ip->ip_len = ip->ip_len - taillen;
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#else
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ip->ip_len = htons(ntohs(ip->ip_len) - taillen);
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#endif
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/* was it transmitted over the IPsec tunnel SA? */
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if (ipsec4_tunnel_validate(ip, nxt, sav)) {
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/*
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* strip off all the headers that precedes ESP header.
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* IP4 xx ESP IP4' payload -> IP4' payload
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*
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* XXX more sanity checks
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* XXX relationship with gif?
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*/
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u_int8_t tos;
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tos = ip->ip_tos;
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m_adj(m, off + esplen + ivlen);
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if (m->m_len < sizeof(*ip)) {
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m = m_pullup(m, sizeof(*ip));
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if (!m) {
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ipsecstat.in_inval++;
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goto bad;
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}
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}
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ip = mtod(m, struct ip *);
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/* ECN consideration. */
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ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos);
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if (!key_checktunnelsanity(sav, AF_INET,
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(caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) {
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ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
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"in IPv4 ESP input: %s %s\n",
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ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
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ipsecstat.in_inval++;
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goto bad;
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}
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#if 0 /* XXX should call ipfw rather than ipsec_in_reject, shouldn't it ? */
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/* drop it if it does not match the default policy */
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if (ipsec4_in_reject(m, NULL)) {
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ipsecstat.in_polvio++;
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goto bad;
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}
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#endif
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key_sa_recordxfer(sav, m);
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if (! IF_HANDOFF(&ipintrq, m, NULL)) {
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ipsecstat.in_inval++;
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m = NULL;
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goto bad;
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}
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m = NULL;
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schednetisr(NETISR_IP); /*can be skipped but to make sure*/
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nxt = IPPROTO_DONE;
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} else {
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/*
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* strip off ESP header and IV.
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* even in m_pulldown case, we need to strip off ESP so that
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* we can always compute checksum for AH correctly.
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*/
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size_t stripsiz;
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stripsiz = esplen + ivlen;
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ip = mtod(m, struct ip *);
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ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off);
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m->m_data += stripsiz;
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m->m_len -= stripsiz;
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m->m_pkthdr.len -= stripsiz;
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ip = mtod(m, struct ip *);
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#ifdef IPLEN_FLIPPED
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ip->ip_len = ip->ip_len - stripsiz;
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#else
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ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz);
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#endif
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ip->ip_p = nxt;
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key_sa_recordxfer(sav, m);
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if (nxt != IPPROTO_DONE)
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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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}
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if (sav) {
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP esp4_input call free SA:%p\n", sav));
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key_freesav(sav);
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}
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ipsecstat.in_success++;
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return;
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bad:
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if (sav) {
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KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
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printf("DP esp4_input call free SA:%p\n", sav));
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key_freesav(sav);
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}
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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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int
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esp6_input(mp, offp, proto)
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struct mbuf **mp;
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int *offp, proto;
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{
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struct mbuf *m = *mp;
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int off = *offp;
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struct ip6_hdr *ip6;
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struct esp *esp;
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struct esptail esptail;
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u_int32_t spi;
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struct secasvar *sav = NULL;
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size_t taillen;
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u_int16_t nxt;
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struct esp_algorithm *algo;
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int ivlen;
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size_t esplen;
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int s;
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/* sanity check for alignment. */
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if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
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ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem "
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"(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
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ipsec6stat.in_inval++;
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goto bad;
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}
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#ifndef PULLDOWN_TEST
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IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE);
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esp = (struct esp *)(mtod(m, caddr_t) + off);
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#else
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IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN);
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if (esp == NULL) {
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ipsec6stat.in_inval++;
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return IPPROTO_DONE;
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}
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#endif
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
|
|
if (ntohs(ip6->ip6_plen) == 0) {
|
|
ipseclog((LOG_ERR, "IPv6 ESP input: "
|
|
"ESP with IPv6 jumbogram is not supported.\n"));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
/* find the sassoc. */
|
|
spi = esp->esp_spi;
|
|
|
|
if ((sav = key_allocsa(AF_INET6,
|
|
(caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
|
|
IPPROTO_ESP, spi)) == 0) {
|
|
ipseclog((LOG_WARNING,
|
|
"IPv6 ESP input: no key association found for spi %u\n",
|
|
(u_int32_t)ntohl(spi)));
|
|
ipsec6stat.in_nosa++;
|
|
goto bad;
|
|
}
|
|
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
|
|
printf("DP esp6_input called to allocate SA:%p\n", sav));
|
|
if (sav->state != SADB_SASTATE_MATURE
|
|
&& sav->state != SADB_SASTATE_DYING) {
|
|
ipseclog((LOG_DEBUG,
|
|
"IPv6 ESP input: non-mature/dying SA found for spi %u\n",
|
|
(u_int32_t)ntohl(spi)));
|
|
ipsec6stat.in_badspi++;
|
|
goto bad;
|
|
}
|
|
if (sav->alg_enc == SADB_EALG_NONE) {
|
|
ipseclog((LOG_DEBUG, "IPv6 ESP input: "
|
|
"unspecified encryption algorithm for spi %u\n",
|
|
(u_int32_t)ntohl(spi)));
|
|
ipsec6stat.in_badspi++;
|
|
goto bad;
|
|
}
|
|
|
|
algo = &esp_algorithms[sav->alg_enc]; /*XXX*/
|
|
|
|
/* check if we have proper ivlen information */
|
|
ivlen = sav->ivlen;
|
|
if (ivlen < 0) {
|
|
ipseclog((LOG_ERR, "inproper ivlen in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
|
|
ipsec6stat.in_badspi++;
|
|
goto bad;
|
|
}
|
|
|
|
if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay
|
|
&& (sav->alg_auth && sav->key_auth)))
|
|
goto noreplaycheck;
|
|
|
|
if (sav->alg_auth == SADB_AALG_NULL)
|
|
goto noreplaycheck;
|
|
|
|
/*
|
|
* check for sequence number.
|
|
*/
|
|
if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav))
|
|
; /*okey*/
|
|
else {
|
|
ipsec6stat.in_espreplay++;
|
|
ipseclog((LOG_WARNING,
|
|
"replay packet in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
|
|
goto bad;
|
|
}
|
|
|
|
/* check ICV */
|
|
{
|
|
u_char sum0[AH_MAXSUMSIZE];
|
|
u_char sum[AH_MAXSUMSIZE];
|
|
struct ah_algorithm *sumalgo;
|
|
size_t siz;
|
|
|
|
sumalgo = &ah_algorithms[sav->alg_auth];
|
|
siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1));
|
|
if (AH_MAXSUMSIZE < siz) {
|
|
ipseclog((LOG_DEBUG,
|
|
"internal error: AH_MAXSUMSIZE must be larger than %lu\n",
|
|
(u_long)siz));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]);
|
|
|
|
if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) {
|
|
ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
|
|
ipsec6stat.in_espauthfail++;
|
|
goto bad;
|
|
}
|
|
|
|
if (bcmp(sum0, sum, siz) != 0) {
|
|
ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
|
|
ipsec6stat.in_espauthfail++;
|
|
goto bad;
|
|
}
|
|
|
|
/* strip off the authentication data */
|
|
m_adj(m, -siz);
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz);
|
|
|
|
m->m_flags |= M_AUTHIPDGM;
|
|
ipsec6stat.in_espauthsucc++;
|
|
}
|
|
|
|
/*
|
|
* update sequence number.
|
|
*/
|
|
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
|
|
if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) {
|
|
ipsec6stat.in_espreplay++;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
noreplaycheck:
|
|
|
|
/* process main esp header. */
|
|
if (sav->flags & SADB_X_EXT_OLD) {
|
|
/* RFC 1827 */
|
|
esplen = sizeof(struct esp);
|
|
} else {
|
|
/* RFC 2406 */
|
|
if (sav->flags & SADB_X_EXT_DERIV)
|
|
esplen = sizeof(struct esp);
|
|
else
|
|
esplen = sizeof(struct newesp);
|
|
}
|
|
|
|
if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) {
|
|
ipseclog((LOG_WARNING,
|
|
"IPv6 ESP input: packet too short\n"));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /*XXX*/
|
|
#else
|
|
IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen);
|
|
if (esp == NULL) {
|
|
ipsec6stat.in_inval++;
|
|
m = NULL;
|
|
goto bad;
|
|
}
|
|
#endif
|
|
ip6 = mtod(m, struct ip6_hdr *); /*set it again just in case*/
|
|
|
|
/*
|
|
* decrypt the packet.
|
|
*/
|
|
if (!algo->decrypt)
|
|
panic("internal error: no decrypt function");
|
|
if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
|
|
ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
ipsec6stat.in_esphist[sav->alg_enc]++;
|
|
|
|
m->m_flags |= M_DECRYPTED;
|
|
|
|
/*
|
|
* find the trailer of the ESP.
|
|
*/
|
|
m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail),
|
|
(caddr_t)&esptail);
|
|
nxt = esptail.esp_nxt;
|
|
taillen = esptail.esp_padlen + sizeof(esptail);
|
|
|
|
if (m->m_pkthdr.len < taillen
|
|
|| m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /*?*/
|
|
ipseclog((LOG_WARNING,
|
|
"bad pad length in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
/* strip off the trailing pad area. */
|
|
m_adj(m, -taillen);
|
|
|
|
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen);
|
|
|
|
/* was it transmitted over the IPsec tunnel SA? */
|
|
if (ipsec6_tunnel_validate(ip6, nxt, sav)) {
|
|
/*
|
|
* strip off all the headers that precedes ESP header.
|
|
* IP6 xx ESP IP6' payload -> IP6' payload
|
|
*
|
|
* XXX more sanity checks
|
|
* XXX relationship with gif?
|
|
*/
|
|
u_int32_t flowinfo; /*net endian*/
|
|
flowinfo = ip6->ip6_flow;
|
|
m_adj(m, off + esplen + ivlen);
|
|
if (m->m_len < sizeof(*ip6)) {
|
|
#ifndef PULLDOWN_TEST
|
|
/*
|
|
* m_pullup is prohibited in KAME IPv6 input processing
|
|
* but there's no other way!
|
|
*/
|
|
#else
|
|
/* okay to pullup in m_pulldown style */
|
|
#endif
|
|
m = m_pullup(m, sizeof(*ip6));
|
|
if (!m) {
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
}
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
/* ECN consideration. */
|
|
ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow);
|
|
if (!key_checktunnelsanity(sav, AF_INET6,
|
|
(caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
|
|
ipseclog((LOG_ERR, "ipsec tunnel address mismatch "
|
|
"in IPv6 ESP input: %s %s\n",
|
|
ipsec6_logpacketstr(ip6, spi),
|
|
ipsec_logsastr(sav)));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
#if 0 /* XXX should call ipfw rather than ipsec_in_reject, shouldn't it ? */
|
|
/* drop it if it does not match the default policy */
|
|
if (ipsec6_in_reject(m, NULL)) {
|
|
ipsec6stat.in_polvio++;
|
|
goto bad;
|
|
}
|
|
#endif
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
|
|
if (! IF_HANDOFF(&ip6intrq, m, NULL)) {
|
|
ipsec6stat.in_inval++;
|
|
m = NULL;
|
|
goto bad;
|
|
}
|
|
m = NULL;
|
|
schednetisr(NETISR_IPV6); /*can be skipped but to make sure*/
|
|
nxt = IPPROTO_DONE;
|
|
} else {
|
|
/*
|
|
* strip off ESP header and IV.
|
|
* even in m_pulldown case, we need to strip off ESP so that
|
|
* we can always compute checksum for AH correctly.
|
|
*/
|
|
size_t stripsiz;
|
|
char *prvnxtp;
|
|
|
|
/*
|
|
* Set the next header field of the previous header correctly.
|
|
*/
|
|
prvnxtp = ip6_get_prevhdr(m, off); /* XXX */
|
|
*prvnxtp = nxt;
|
|
|
|
stripsiz = esplen + ivlen;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (m->m_len >= stripsiz + off) {
|
|
ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off);
|
|
m->m_data += stripsiz;
|
|
m->m_len -= stripsiz;
|
|
m->m_pkthdr.len -= stripsiz;
|
|
} else {
|
|
/*
|
|
* this comes with no copy if the boundary is on
|
|
* cluster
|
|
*/
|
|
struct mbuf *n;
|
|
|
|
n = m_split(m, off, M_DONTWAIT);
|
|
if (n == NULL) {
|
|
/* m is retained by m_split */
|
|
goto bad;
|
|
}
|
|
m_adj(n, stripsiz);
|
|
m_cat(m, n);
|
|
/* m_cat does not update m_pkthdr.len */
|
|
m->m_pkthdr.len += n->m_pkthdr.len;
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
}
|
|
|
|
*offp = off;
|
|
*mp = m;
|
|
|
|
if (sav) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
|
|
printf("DP esp6_input call free SA:%p\n", sav));
|
|
key_freesav(sav);
|
|
}
|
|
ipsec6stat.in_success++;
|
|
return nxt;
|
|
|
|
bad:
|
|
if (sav) {
|
|
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
|
|
printf("DP esp6_input call free SA:%p\n", sav));
|
|
key_freesav(sav);
|
|
}
|
|
if (m)
|
|
m_freem(m);
|
|
return IPPROTO_DONE;
|
|
}
|
|
#endif /* INET6 */
|