408 lines
11 KiB
C
408 lines
11 KiB
C
/* $NetBSD: ipsec_netbsd.c,v 1.2 2003/09/12 11:20:58 itojun Exp $ */
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/* $KAME: esp_input.c,v 1.60 2001/09/04 08:43:19 itojun Exp $ */
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/* $KAME: ah_input.c,v 1.64 2001/09/04 08:43:19 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipsec_netbsd.c,v 1.2 2003/09/12 11:20:58 itojun Exp $");
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.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/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_ecn.h>
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#include <netinet/ip_icmp.h>
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#ifdef IPSEC
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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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#endif
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#ifdef FAST_IPSEC
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#include <netipsec/ipsec.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 <netipsec/ah_var.h>
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#endif
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#include <machine/stdarg.h>
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#include <netkey/key.h>
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/* assumes that ip header and ah header are contiguous on mbuf */
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void *
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ah4_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 ah *ah;
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struct icmp *icp;
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struct secasvar *sav;
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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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#ifndef notyet
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(void) ip; (void) ah; (void) icp; (void) sav;
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#else
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if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) {
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/*
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* 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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*/
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ah = (struct ah *)((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_AH, ah->ah_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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key_freesav(sav);
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/*
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* Now that we've validated that we are actually communicating
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* with the host indicated in the ICMP message, locate the
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* ICMP header, recalculate the new MTU, and create the
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* corresponding routing entry.
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*/
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icp = (struct icmp *)((caddr_t)ip -
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offsetof(struct icmp, icmp_ip));
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icmp_mtudisc(icp, ip->ip_dst);
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return NULL;
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}
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#endif
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return NULL;
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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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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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#ifndef notyet
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(void) ip; (void) esp; (void) icp; (void) sav;
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#else
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if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) {
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/*
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* 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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*/
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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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key_freesav(sav);
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/*
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* Now that we've validated that we are actually communicating
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* with the host indicated in the ICMP message, locate the
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* ICMP header, recalculate the new MTU, and create the
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* corresponding routing entry.
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*/
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icp = (struct icmp *)((caddr_t)ip -
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offsetof(struct icmp, icmp_ip));
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icmp_mtudisc(icp, ip->ip_dst);
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return NULL;
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}
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#endif
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return NULL;
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}
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#ifdef INET6
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void
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esp6_ctlinput(cmd, sa, d)
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int cmd;
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struct sockaddr *sa;
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void *d;
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{
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const struct newesp *espp;
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struct newesp esp;
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struct ip6ctlparam *ip6cp = NULL, ip6cp1;
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struct secasvar *sav;
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struct ip6_hdr *ip6;
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struct mbuf *m;
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int off;
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struct sockaddr_in6 *sa6_src, *sa6_dst;
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if (sa->sa_family != AF_INET6 ||
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sa->sa_len != sizeof(struct sockaddr_in6))
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return;
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if ((unsigned)cmd >= PRC_NCMDS)
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return;
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/* if the parameter is from icmp6, decode it. */
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if (d != NULL) {
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ip6cp = (struct ip6ctlparam *)d;
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m = ip6cp->ip6c_m;
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ip6 = ip6cp->ip6c_ip6;
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off = ip6cp->ip6c_off;
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} else {
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m = NULL;
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ip6 = NULL;
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}
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if (ip6) {
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/*
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* Notify the error to all possible sockets via pfctlinput2.
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* Since the upper layer information (such as protocol type,
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* source and destination ports) is embedded in the encrypted
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* data and might have been cut, we can't directly call
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* an upper layer ctlinput function. However, the pcbnotify
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* function will consider source and destination addresses
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* as well as the flow info value, and may be able to find
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* some PCB that should be notified.
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* Although pfctlinput2 will call esp6_ctlinput(), there is
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* no possibility of an infinite loop of function calls,
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* because we don't pass the inner IPv6 header.
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*/
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bzero(&ip6cp1, sizeof(ip6cp1));
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ip6cp1.ip6c_src = ip6cp->ip6c_src;
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pfctlinput2(cmd, sa, (void *)&ip6cp1);
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/*
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* Then go to special cases that need ESP header information.
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* XXX: We assume that when ip6 is non NULL,
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* M and OFF are valid.
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*/
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/* check if we can safely examine src and dst ports */
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if (m->m_pkthdr.len < off + sizeof(esp))
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return;
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if (m->m_len < off + sizeof(esp)) {
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/*
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* this should be rare case,
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* so we compromise on this copy...
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*/
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m_copydata(m, off, sizeof(esp), (caddr_t)&esp);
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espp = &esp;
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} else
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espp = (struct newesp*)(mtod(m, caddr_t) + off);
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if (cmd == PRC_MSGSIZE) {
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int valid = 0;
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/*
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* 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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*/
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sa6_src = ip6cp->ip6c_src;
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sa6_dst = (struct sockaddr_in6 *)sa;
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sav = key_allocsa(AF_INET6,
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(caddr_t)&sa6_src->sin6_addr,
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(caddr_t)&sa6_dst->sin6_addr,
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IPPROTO_ESP, espp->esp_spi);
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if (sav) {
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if (sav->state == SADB_SASTATE_MATURE ||
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sav->state == SADB_SASTATE_DYING)
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valid++;
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key_freesav(sav);
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}
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/* XXX Further validation? */
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/*
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* Depending on the value of "valid" and routing table
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* size (mtudisc_{hi,lo}wat), we will:
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* - recalcurate the new MTU and create the
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* corresponding routing entry, or
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* - ignore the MTU change notification.
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*/
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icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
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}
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} else {
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/* we normally notify any pcb here */
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}
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}
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#endif /* INET6 */
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/*FIXME: placebo for invalpcbcacheall. Fast-IPsec has no pcb cache? */
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void ipsec_invalpcbcacheall(void);
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void
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ipsec_invalpcbcacheall(void)
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{
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}
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/* XXX will need a different oid at parent */
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int
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ipsec_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
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int *name;
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u_int namelen;
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void *oldp;
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size_t *oldlenp;
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void *newp;
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size_t newlen;
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{
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/* All sysctl names at this level are terminal. */
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if (namelen != 1)
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return ENOTDIR;
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/* common sanity checks */
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switch (name[0]) {
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case IPSECCTL_DEF_ESP_TRANSLEV:
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case IPSECCTL_DEF_ESP_NETLEV:
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case IPSECCTL_DEF_AH_TRANSLEV:
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case IPSECCTL_DEF_AH_NETLEV:
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if (newp != NULL && newlen == sizeof(int)) {
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switch (*(int *)newp) {
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case IPSEC_LEVEL_USE:
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case IPSEC_LEVEL_REQUIRE:
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break;
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default:
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return EINVAL;
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}
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}
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break;
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case IPSECCTL_DEF_POLICY:
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if (newp != NULL && newlen == sizeof(int)) {
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switch (*(int *)newp) {
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case IPSEC_POLICY_DISCARD:
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case IPSEC_POLICY_NONE:
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break;
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default:
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return EINVAL;
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}
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ipsec_invalpcbcacheall();
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}
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break;
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}
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switch (name[0]) {
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case IPSECCTL_STATS:
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return sysctl_struct(oldp, oldlenp, newp, newlen,
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&ipsecstat, sizeof(ipsecstat));
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case IPSECCTL_DEF_POLICY:
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_def_policy.policy);
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case IPSECCTL_DEF_ESP_TRANSLEV:
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if (newp != NULL)
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ipsec_invalpcbcacheall();
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_esp_trans_deflev);
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case IPSECCTL_DEF_ESP_NETLEV:
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if (newp != NULL)
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ipsec_invalpcbcacheall();
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_esp_net_deflev);
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case IPSECCTL_DEF_AH_TRANSLEV:
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if (newp != NULL)
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ipsec_invalpcbcacheall();
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_ah_trans_deflev);
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case IPSECCTL_DEF_AH_NETLEV:
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if (newp != NULL)
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ipsec_invalpcbcacheall();
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_ah_net_deflev);
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case IPSECCTL_AH_CLEARTOS:
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&/*ip4_*/ah_cleartos);
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case IPSECCTL_AH_OFFSETMASK:
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_ah_offsetmask);
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case IPSECCTL_DFBIT:
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return sysctl_int(oldp, oldlenp, newp, newlen,
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&ip4_ipsec_dfbit);
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case IPSECCTL_ECN:
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return sysctl_int(oldp, oldlenp, newp, newlen, &ip4_ipsec_ecn);
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case IPSECCTL_DEBUG:
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return sysctl_int(oldp, oldlenp, newp, newlen, &ipsec_debug);
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default:
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return EOPNOTSUPP;
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}
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/* NOTREACHED */
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}
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