1037 lines
25 KiB
C
1037 lines
25 KiB
C
/* $NetBSD: esp_input.c,v 1.14 2001/01/24 09:04:16 itojun Exp $ */
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/* $KAME: esp_input.c,v 1.50 2001/01/23 08:59:37 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 <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 <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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#include <netinet/ip_icmp.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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#include <netinet/icmp6.h>
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#include <netinet6/ip6protosw.h>
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#endif
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#include <netinet6/ipsec.h>
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#include <netinet6/ah.h>
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#include <netinet6/esp.h>
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#include <netkey/key.h>
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#include <netkey/keydb.h>
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#include <netkey/key_debug.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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#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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#ifdef INET
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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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const 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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int s;
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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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algo = esp_algorithm_lookup(sav->alg_enc);
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if (!algo) {
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ipseclog((LOG_DEBUG, "IPv4 ESP input: "
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"unsupported 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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/* 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_X_AALG_NULL ||
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sav->alg_auth == SADB_AALG_NONE)
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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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const struct ah_algorithm *sumalgo;
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size_t siz;
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sumalgo = ah_algorithm_lookup(sav->alg_auth);
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if (!sumalgo)
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goto noreplaycheck;
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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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* pre-compute and cache intermediate key
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*/
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if (esp_schedule(algo, sav) != 0) {
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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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* 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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/* m is already freed */
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m = NULL;
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ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n",
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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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* 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 (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
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ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) {
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ipsecstat.in_nomem++;
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goto bad;
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}
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s = splimp();
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if (IF_QFULL(&ipintrq)) {
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ipsecstat.in_inval++;
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splx(s);
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goto bad;
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}
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IF_ENQUEUE(&ipintrq, m);
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m = NULL;
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schednetisr(NETISR_IP); /*can be skipped but to make sure*/
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splx(s);
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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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|
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key_sa_recordxfer(sav, m);
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if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
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ipsecstat.in_nomem++;
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goto bad;
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}
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|
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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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|
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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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|
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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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|
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/* assumes that ip header and esp header are contiguous on mbuf */
|
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void *
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esp4_ctlinput(cmd, sa, v)
|
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int cmd;
|
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struct sockaddr *sa;
|
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void *v;
|
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{
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struct ip *ip = v;
|
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struct esp *esp;
|
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struct icmp *icp;
|
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struct secasvar *sav;
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|
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if (sa->sa_family != AF_INET ||
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sa->sa_len != sizeof(struct sockaddr_in))
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return NULL;
|
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if ((unsigned)cmd >= PRC_NCMDS)
|
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return NULL;
|
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if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) {
|
|
/*
|
|
* Check to see if we have a valid SA corresponding to
|
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* the address in the ICMP message payload.
|
|
*/
|
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esp = (struct esp *)((caddr_t)ip + (ip->ip_hl << 2));
|
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if ((sav = key_allocsa(AF_INET,
|
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(caddr_t) &ip->ip_src,
|
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(caddr_t) &ip->ip_dst,
|
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IPPROTO_ESP, esp->esp_spi)) == NULL)
|
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return NULL;
|
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if (sav->state != SADB_SASTATE_MATURE &&
|
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sav->state != SADB_SASTATE_DYING) {
|
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key_freesav(sav);
|
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return NULL;
|
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}
|
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|
|
/* XXX Further validation? */
|
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|
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key_freesav(sav);
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|
|
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/*
|
|
* Now that we've validated that we are actually communicating
|
|
* with the host indicated in the ICMP message, locate the
|
|
* ICMP header, recalculate the new MTU, and create the
|
|
* corresponding routing entry.
|
|
*/
|
|
icp = (struct icmp *)((caddr_t)ip -
|
|
offsetof(struct icmp, icmp_ip));
|
|
icmp_mtudisc(icp, ip->ip_dst);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
int
|
|
esp6_input(mp, offp, proto)
|
|
struct mbuf **mp;
|
|
int *offp, proto;
|
|
{
|
|
struct mbuf *m = *mp;
|
|
int off = *offp;
|
|
struct ip6_hdr *ip6;
|
|
struct esp *esp;
|
|
struct esptail esptail;
|
|
u_int32_t spi;
|
|
struct secasvar *sav = NULL;
|
|
size_t taillen;
|
|
u_int16_t nxt;
|
|
const struct esp_algorithm *algo;
|
|
int ivlen;
|
|
size_t esplen;
|
|
int s;
|
|
|
|
/* sanity check for alignment. */
|
|
if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) {
|
|
ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem "
|
|
"(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len));
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE);
|
|
esp = (struct esp *)(mtod(m, caddr_t) + off);
|
|
#else
|
|
IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN);
|
|
if (esp == NULL) {
|
|
ipsec6stat.in_inval++;
|
|
return IPPROTO_DONE;
|
|
}
|
|
#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;
|
|
}
|
|
algo = esp_algorithm_lookup(sav->alg_enc);
|
|
if (!algo) {
|
|
ipseclog((LOG_DEBUG, "IPv6 ESP input: "
|
|
"unsupported encryption algorithm for spi %u\n",
|
|
(u_int32_t)ntohl(spi)));
|
|
ipsec6stat.in_badspi++;
|
|
goto bad;
|
|
}
|
|
|
|
/* 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_X_AALG_NULL ||
|
|
sav->alg_auth == SADB_AALG_NONE)
|
|
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];
|
|
const struct ah_algorithm *sumalgo;
|
|
size_t siz;
|
|
|
|
sumalgo = ah_algorithm_lookup(sav->alg_auth);
|
|
if (!sumalgo)
|
|
goto noreplaycheck;
|
|
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*/
|
|
|
|
/*
|
|
* pre-compute and cache intermediate key
|
|
*/
|
|
if (esp_schedule(algo, sav) != 0) {
|
|
ipsec6stat.in_inval++;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* decrypt the packet.
|
|
*/
|
|
if (!algo->decrypt)
|
|
panic("internal error: no decrypt function");
|
|
if ((*algo->decrypt)(m, off, sav, algo, ivlen)) {
|
|
/* m is already freed */
|
|
m = NULL;
|
|
ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n",
|
|
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 (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 ||
|
|
ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) {
|
|
ipsec6stat.in_nomem++;
|
|
goto bad;
|
|
}
|
|
|
|
s = splimp();
|
|
if (IF_QFULL(&ip6intrq)) {
|
|
ipsec6stat.in_inval++;
|
|
splx(s);
|
|
goto bad;
|
|
}
|
|
IF_ENQUEUE(&ip6intrq, m);
|
|
m = NULL;
|
|
schednetisr(NETISR_IPV6); /*can be skipped but to make sure*/
|
|
splx(s);
|
|
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;
|
|
}
|
|
|
|
#ifndef PULLDOWN_TEST
|
|
/*
|
|
* KAME requires that the packet to be contiguous on the
|
|
* mbuf. We need to make that sure.
|
|
* this kind of code should be avoided.
|
|
* XXX other conditions to avoid running this part?
|
|
*/
|
|
if (m->m_len != m->m_pkthdr.len) {
|
|
struct mbuf *n = NULL;
|
|
int maxlen;
|
|
|
|
MGETHDR(n, M_DONTWAIT, MT_HEADER);
|
|
maxlen = MHLEN;
|
|
if (n)
|
|
M_COPY_PKTHDR(n, m);
|
|
if (n && m->m_pkthdr.len > maxlen) {
|
|
MCLGET(n, M_DONTWAIT);
|
|
maxlen = MCLBYTES;
|
|
if ((n->m_flags & M_EXT) == 0) {
|
|
m_free(n);
|
|
n = NULL;
|
|
}
|
|
}
|
|
if (!n) {
|
|
printf("esp6_input: mbuf allocation failed\n");
|
|
goto bad;
|
|
}
|
|
|
|
if (m->m_pkthdr.len <= maxlen) {
|
|
m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
|
|
n->m_len = m->m_pkthdr.len;
|
|
n->m_pkthdr.len = m->m_pkthdr.len;
|
|
n->m_next = NULL;
|
|
m_freem(m);
|
|
} else {
|
|
m_copydata(m, 0, maxlen, mtod(n, caddr_t));
|
|
m_adj(m, maxlen);
|
|
n->m_len = maxlen;
|
|
n->m_pkthdr.len = m->m_pkthdr.len;
|
|
n->m_next = m;
|
|
m->m_flags &= ~M_PKTHDR;
|
|
}
|
|
m = n;
|
|
}
|
|
#endif
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) {
|
|
ipsec6stat.in_nomem++;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
*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;
|
|
}
|
|
|
|
void
|
|
esp6_ctlinput(cmd, sa, d)
|
|
int cmd;
|
|
struct sockaddr *sa;
|
|
void *d;
|
|
{
|
|
const struct newesp *espp;
|
|
struct newesp esp;
|
|
struct secasvar *sav;
|
|
struct ip6_hdr *ip6;
|
|
struct mbuf *m;
|
|
int off;
|
|
struct in6_addr finaldst;
|
|
struct in6_addr s;
|
|
|
|
if (sa->sa_family != AF_INET6 ||
|
|
sa->sa_len != sizeof(struct sockaddr_in6))
|
|
return;
|
|
if ((unsigned)cmd >= PRC_NCMDS)
|
|
return;
|
|
|
|
/* if the parameter is from icmp6, decode it. */
|
|
if (d != NULL) {
|
|
struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d;
|
|
m = ip6cp->ip6c_m;
|
|
ip6 = ip6cp->ip6c_ip6;
|
|
off = ip6cp->ip6c_off;
|
|
|
|
/* translate addresses into internal form */
|
|
bcopy(ip6cp->ip6c_finaldst, &finaldst, sizeof(finaldst));
|
|
if (IN6_IS_ADDR_LINKLOCAL(&finaldst)) {
|
|
finaldst.s6_addr16[1] =
|
|
htons(m->m_pkthdr.rcvif->if_index);
|
|
}
|
|
bcopy(&ip6->ip6_src, &s, sizeof(s));
|
|
if (IN6_IS_ADDR_LINKLOCAL(&s))
|
|
s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
|
|
} else {
|
|
m = NULL;
|
|
ip6 = NULL;
|
|
}
|
|
|
|
if (ip6) {
|
|
/*
|
|
* XXX: We assume that when ip6 is non NULL,
|
|
* M and OFF are valid.
|
|
*/
|
|
|
|
/* check if we can safely examine src and dst ports */
|
|
if (m->m_pkthdr.len < off + sizeof(esp))
|
|
return;
|
|
|
|
if (m->m_len < off + sizeof(esp)) {
|
|
/*
|
|
* this should be rare case,
|
|
* so we compromise on this copy...
|
|
*/
|
|
m_copydata(m, off, sizeof(esp), (caddr_t)&esp);
|
|
espp = &esp;
|
|
} else
|
|
espp = (struct newesp*)(mtod(m, caddr_t) + off);
|
|
|
|
if (cmd == PRC_MSGSIZE) {
|
|
int valid = 0;
|
|
/*
|
|
* Check to see if we have a valid SA corresponding to
|
|
* the address in the ICMP message payload.
|
|
*/
|
|
sav = key_allocsa(AF_INET6, (caddr_t)&s,
|
|
(caddr_t)&finaldst, IPPROTO_ESP, espp->esp_spi);
|
|
if (sav) {
|
|
if (sav->state == SADB_SASTATE_MATURE ||
|
|
sav->state == SADB_SASTATE_DYING)
|
|
valid++;
|
|
key_freesav(sav);
|
|
}
|
|
|
|
/* XXX Further validation? */
|
|
|
|
/*
|
|
* Now that we've validated that we are actually
|
|
* communicating with the host indicated in the ICMPv6
|
|
* message, recalculate the new MTU, and create the
|
|
* corresponding routing entry.
|
|
*/
|
|
icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
|
|
|
|
return;
|
|
}
|
|
|
|
/* we normally notify single pcb here */
|
|
} else {
|
|
/* we normally notify any pcb here */
|
|
}
|
|
}
|
|
#endif /* INET6 */
|