xref: /src/sys/netipsec/ipsec_netbsd.c

/*	$NetBSD: ipsec_netbsd.c,v 1.24 2007/03/04 21:17:55 degroote Exp $	*/
/*	$KAME: esp_input.c,v 1.60 2001/09/04 08:43:19 itojun Exp $	*/
/*	$KAME: ah_input.c,v 1.64 2001/09/04 08:43:19 itojun Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ipsec_netbsd.c,v 1.24 2007/03/04 21:17:55 degroote Exp $");

#include "opt_inet.h"
#include "opt_ipsec.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/route.h>
#include <net/netisr.h>
#include <machine/cpu.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_ecn.h>
#include <netinet/ip_icmp.h>


#include <netipsec/ipsec.h>
#include <netipsec/ipsec_var.h>
#include <netipsec/key.h>
#include <netipsec/keydb.h>
#include <netipsec/key_debug.h>
#include <netipsec/ah.h>
#include <netipsec/ah_var.h>
#include <netipsec/esp.h>
#include <netipsec/esp_var.h>
#include <netipsec/ipip_var.h>
#include <netipsec/ipcomp_var.h>

#ifdef INET6
#include <netipsec/ipsec6.h>
#include <netinet6/ip6protosw.h>
#include <netinet/icmp6.h>
#endif

#include <machine/stdarg.h>



#include <netipsec/key.h>

/* assumes that ip header and ah header are contiguous on mbuf */
void*
ah4_ctlinput(cmd, sa, v)
	int cmd;
	const struct sockaddr *sa;
	void *v;
{
	struct ip *ip = v;
	struct ah *ah;
	struct icmp *icp;
	struct secasvar *sav;

	if (sa->sa_family != AF_INET ||
		sa->sa_len != sizeof(struct sockaddr_in))
		return NULL;
	if ((unsigned)cmd >= PRC_NCMDS)
		return NULL;

	if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) {
		/*
		 * Check to see if we have a valid SA corresponding to
		 * the address in the ICMP message payload.
		 */
		ah = (struct ah *)((char *)ip + (ip->ip_hl << 2));
		sav = KEY_ALLOCSA((const union sockaddr_union *)sa,
					   	IPPROTO_AH, ah->ah_spi);

		if (sav) {
        	if (sav->state == SADB_SASTATE_MATURE ||
                sav->state == SADB_SASTATE_DYING) {

				/*
				 * 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 *)((char *)ip -
									  offsetof(struct icmp, icmp_ip));
				icmp_mtudisc(icp, ip->ip_dst);

			}
			KEY_FREESAV(&sav);
		}
	}
	return NULL;
}



/* assumes that ip header and esp header are contiguous on mbuf */
void*
esp4_ctlinput(cmd, sa, v)
	int cmd;
	const struct sockaddr *sa;
	void *v;
{
	struct ip *ip = v;
	struct esp *esp;
	struct icmp *icp;
	struct secasvar *sav;

	if (sa->sa_family != AF_INET ||
	    sa->sa_len != sizeof(struct sockaddr_in))
		return NULL;
	if ((unsigned)cmd >= PRC_NCMDS)
		return NULL;

	if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) {
		/*
		 * Check to see if we have a valid SA corresponding to
		 * the address in the ICMP message payload.
		 */
		esp = (struct esp *)((char *)ip + (ip->ip_hl << 2));
		sav = KEY_ALLOCSA((const union sockaddr_union *)sa,
					   	IPPROTO_ESP, esp->esp_spi);

		if (sav) {
        	if (sav->state == SADB_SASTATE_MATURE ||
                sav->state == SADB_SASTATE_DYING) {

				/*
				 * 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 *)((char *)ip -
									   offsetof(struct icmp, icmp_ip));
				icmp_mtudisc(icp, ip->ip_dst);

			}
			KEY_FREESAV(&sav);
		}
	}
	return NULL;
}

#ifdef INET6
void
ah6_ctlinput(cmd, sa, d)
       int cmd;
       const struct sockaddr *sa;
       void *d;
{
       const struct newah *ahp;
       struct newah ah;
       struct secasvar *sav;
       struct ip6_hdr *ip6;
       struct mbuf *m;
       struct ip6ctlparam *ip6cp = NULL;
       int off;

       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) {
               ip6cp = (struct ip6ctlparam *)d;
               m = ip6cp->ip6c_m;
               ip6 = ip6cp->ip6c_ip6;
               off = ip6cp->ip6c_off;
       } else {
               m = NULL;
               ip6 = NULL;
               off = 0;
       }

       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(ah))
                       return;

               if (m->m_len < off + sizeof(ah)) {
                       /*
                        * this should be rare case,
                        * so we compromise on this copy...
                        */
                       m_copydata(m, off, sizeof(ah), &ah);
                       ahp = &ah;
               } else
                       ahp = (struct newah *)(mtod(m, char *) + 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((const union sockaddr_union*)sa,
                                         IPPROTO_AH, ahp->ah_spi);

                       if (sav) {
                               if (sav->state == SADB_SASTATE_MATURE ||
                                   sav->state == SADB_SASTATE_DYING)
                                       valid++;
                               KEY_FREESAV(&sav);
                       }

                       /* XXX Further validation? */

                       /*
                        * Depending on the value of "valid" and routing
                        * table size (mtudisc_{hi,lo}wat), we will:
                        * - recalcurate the new MTU and create the
                        *   corresponding routing entry, or
                        * - ignore the MTU change notification.
                        */
                       icmp6_mtudisc_update((struct ip6ctlparam *)d,valid);
               }

               /* we normally notify single pcb here */
       } else {
               /* we normally notify any pcb here */
       }
}



void
esp6_ctlinput(cmd, sa, d)
	int cmd;
	const struct sockaddr *sa;
	void *d;
{
	const struct newesp *espp;
	struct newesp esp;
	struct ip6ctlparam *ip6cp = NULL, ip6cp1;
	struct secasvar *sav;
	struct ip6_hdr *ip6;
	struct mbuf *m;
	int off;

	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) {
		ip6cp = (struct ip6ctlparam *)d;
		m = ip6cp->ip6c_m;
		ip6 = ip6cp->ip6c_ip6;
		off = ip6cp->ip6c_off;
	} else {
		m = NULL;
		ip6 = NULL;
		off = 0;
	}

	if (ip6) {
		/*
		 * Notify the error to all possible sockets via pfctlinput2.
		 * Since the upper layer information (such as protocol type,
		 * source and destination ports) is embedded in the encrypted
		 * data and might have been cut, we can't directly call
		 * an upper layer ctlinput function. However, the pcbnotify
		 * function will consider source and destination addresses
		 * as well as the flow info value, and may be able to find
		 * some PCB that should be notified.
		 * Although pfctlinput2 will call esp6_ctlinput(), there is
		 * no possibility of an infinite loop of function calls,
		 * because we don't pass the inner IPv6 header.
		 */
		memset(&ip6cp1, 0, sizeof(ip6cp1));
		ip6cp1.ip6c_src = ip6cp->ip6c_src;
		pfctlinput2(cmd, sa, &ip6cp1);

		/*
		 * Then go to special cases that need ESP header information.
		 * 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), &esp);
			espp = &esp;
		} else
			espp = (struct newesp*)(mtod(m, char *) + 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((const union sockaddr_union*)sa,
					  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? */

			/*
			 * Depending on the value of "valid" and routing table
			 * size (mtudisc_{hi,lo}wat), we will:
			 * - recalcurate the new MTU and create the
			 *   corresponding routing entry, or
			 * - ignore the MTU change notification.
			 */
			icmp6_mtudisc_update((struct ip6ctlparam *)d, valid);
		}
	} else {
		/* we normally notify any pcb here */
	}
}
#endif /* INET6 */

static int
sysctl_fast_ipsec(SYSCTLFN_ARGS)
{
	int error, t;
	struct sysctlnode node;

	node = *rnode;
	t = *(int*)rnode->sysctl_data;
	node.sysctl_data = &t;
	error = sysctl_lookup(SYSCTLFN_CALL(&node));
	if (error || newp == NULL)
		return (error);

	switch (rnode->sysctl_num) {
	case IPSECCTL_DEF_ESP_TRANSLEV:
	case IPSECCTL_DEF_ESP_NETLEV:
	case IPSECCTL_DEF_AH_TRANSLEV:
	case IPSECCTL_DEF_AH_NETLEV:
		if (t != IPSEC_LEVEL_USE &&
		    t != IPSEC_LEVEL_REQUIRE)
			return (EINVAL);
		ipsec_invalpcbcacheall();
		break;
      	case IPSECCTL_DEF_POLICY:
		if (t != IPSEC_POLICY_DISCARD &&
		    t != IPSEC_POLICY_NONE)
			return (EINVAL);
		ipsec_invalpcbcacheall();
		break;
	default:
		return (EINVAL);
	}

	*(int*)rnode->sysctl_data = t;

	return (0);
}

#ifdef IPSEC_DEBUG
static int
sysctl_fast_ipsec_test(SYSCTLFN_ARGS)
{
	int t, error;
	struct sysctlnode node;

	node = *rnode;
	t = *(int*)rnode->sysctl_data;
	node.sysctl_data = &t;
	error = sysctl_lookup(SYSCTLFN_CALL(&node));
	if (error || newp == NULL)
		return (error);

	if (t < 0 || t > 1)
		return EINVAL;

	if (rnode->sysctl_data == &ipsec_replay)
		printf("fast_ipsec: Anti-Replay service %s\n",
		    (t == 1) ? "deactivated" : "activated");
	else if (rnode->sysctl_data == &ipsec_integrity)
		 printf("fast_ipsec: HMAC corruption %s\n",
		     (t == 0) ? "deactivated" : "activated");

	*(int*)rnode->sysctl_data = t;

	return 0;
}
#endif

/* XXX will need a different oid at parent */
SYSCTL_SETUP(sysctl_net_inet_fast_ipsec_setup, "sysctl net.inet.ipsec subtree setup")
{
	const struct sysctlnode *_ipsec;
	int ipproto_ipsec;

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "net", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "inet", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET, CTL_EOL);

	/*
	 * in numerical order:
	 *
	 * net.inet.ipip:	CTL_NET.PF_INET.IPPROTO_IPIP
	 * net.inet.esp:	CTL_NET.PF_INET.IPPROTO_ESP
	 * net.inet.ah:		CTL_NET.PF_INET.IPPROTO_AH
	 * net.inet.ipcomp:	CTL_NET.PF_INET.IPPROTO_IPCOMP
	 * net.inet.ipsec:	CTL_NET.PF_INET.CTL_CREATE
	 *
	 * this creates separate trees by name, but maintains that the
	 * ipsec name leads to all the old leaves.
	 */

	/* create net.inet.ipip */
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "ipip", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET, IPPROTO_IPIP, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
		       CTLTYPE_STRUCT, "ipip_stats", NULL,
		       NULL, 0, &ipipstat, sizeof(ipipstat),
		       CTL_NET, PF_INET, IPPROTO_IPIP,
		       CTL_CREATE, CTL_EOL);

	/* create net.inet.esp subtree under IPPROTO_ESP */
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "esp", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET, IPPROTO_ESP, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "trans_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_esp_trans_deflev, 0,
		       CTL_NET, PF_INET, IPPROTO_ESP,
		       IPSECCTL_DEF_ESP_TRANSLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "net_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_esp_net_deflev, 0,
		       CTL_NET, PF_INET, IPPROTO_ESP,
		       IPSECCTL_DEF_ESP_NETLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
		       CTLTYPE_STRUCT, "esp_stats", NULL,
		       NULL, 0, &espstat, sizeof(espstat),
		       CTL_NET, PF_INET, IPPROTO_ESP,
		       CTL_CREATE, CTL_EOL);

	/* create net.inet.ah subtree under IPPROTO_AH */
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "ah", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET, IPPROTO_AH, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "cleartos", NULL,
		       NULL, 0, &/*ip4_*/ah_cleartos, 0,
		       CTL_NET, PF_INET, IPPROTO_AH,
		       IPSECCTL_AH_CLEARTOS, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "offsetmask", NULL,
		       NULL, 0, &ip4_ah_offsetmask, 0,
		       CTL_NET, PF_INET, IPPROTO_AH,
		       IPSECCTL_AH_OFFSETMASK, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "trans_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_ah_trans_deflev, 0,
		       CTL_NET, PF_INET, IPPROTO_AH,
		       IPSECCTL_DEF_AH_TRANSLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "net_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_ah_net_deflev, 0,
		       CTL_NET, PF_INET, IPPROTO_AH,
		       IPSECCTL_DEF_AH_NETLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
		       CTLTYPE_STRUCT, "ah_stats", NULL,
		       NULL, 0, &ahstat, sizeof(ahstat),
		       CTL_NET, PF_INET, IPPROTO_AH,
		       CTL_CREATE, CTL_EOL);

	/* create net.inet.ipcomp */
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "ipcomp", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET, IPPROTO_IPCOMP, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
		       CTLTYPE_STRUCT, "ipcomp_stats", NULL,
		       NULL, 0, &ipcompstat, sizeof(ipcompstat),
		       CTL_NET, PF_INET, IPPROTO_IPCOMP,
		       CTL_CREATE, CTL_EOL);

	/* create net.inet.ipsec subtree under dynamic oid */
	sysctl_createv(clog, 0, NULL, &_ipsec,
		       CTLFLAG_PERMANENT,
		       CTLTYPE_NODE, "ipsec", NULL,
		       NULL, 0, NULL, 0,
		       CTL_NET, PF_INET, CTL_CREATE, CTL_EOL);
	ipproto_ipsec = (_ipsec != NULL) ? _ipsec->sysctl_num : 0;

	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "def_policy", NULL,
		       sysctl_fast_ipsec, 0, &ip4_def_policy.policy, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DEF_POLICY, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "esp_trans_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_esp_trans_deflev, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DEF_ESP_TRANSLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "esp_net_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_esp_net_deflev, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DEF_ESP_NETLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "ah_trans_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_ah_trans_deflev, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DEF_AH_TRANSLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "ah_net_deflev", NULL,
		       sysctl_fast_ipsec, 0, &ip4_ah_net_deflev, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DEF_AH_NETLEV, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "ah_cleartos", NULL,
		       NULL, 0, &/*ip4_*/ah_cleartos, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_AH_CLEARTOS, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "ah_offsetmask", NULL,
		       NULL, 0, &ip4_ah_offsetmask, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_AH_OFFSETMASK, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "dfbit", NULL,
		       NULL, 0, &ip4_ipsec_dfbit, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DFBIT, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "ecn", NULL,
		       NULL, 0, &ip4_ipsec_ecn, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_ECN, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "debug", NULL,
		       NULL, 0, &ipsec_debug, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       IPSECCTL_DEBUG, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
		       CTLTYPE_STRUCT, "ipsecstats", NULL,
		       NULL, 0, &ipsecstat, sizeof(ipsecstat),
		       CTL_NET, PF_INET, ipproto_ipsec,
		       CTL_CREATE, CTL_EOL);
#ifdef IPSEC_DEBUG
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "test_replay",
		       SYSCTL_DESCR("Emulate replay attack"),
		       sysctl_fast_ipsec_test, 0, &ipsec_replay, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       CTL_CREATE, CTL_EOL);
	sysctl_createv(clog, 0, NULL, NULL,
		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
		       CTLTYPE_INT, "test_integrity",
		       SYSCTL_DESCR("Emulate man-in-the-middle attack"),
		       sysctl_fast_ipsec_test, 0, &ipsec_integrity, 0,
		       CTL_NET, PF_INET, ipproto_ipsec,
		       CTL_CREATE, CTL_EOL);
#endif
}