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NetBSD/sys/netipsec/ipsec_netbsd.c

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/* $NetBSD: ipsec_netbsd.c,v 1.17 2006/05/14 21:19:34 elad 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 1.17 2006/05/14 21:19:34 elad 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_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;
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;
#ifndef notyet
/* jonathan@NetBSD.org: XXX FIXME */
(void) ip; (void) ah; (void) icp; (void) sav;
#else
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 *)((caddr_t)ip + (ip->ip_hl << 2));
if ((sav = key_allocsa(AF_INET,
(caddr_t) &ip->ip_src,
(caddr_t) &ip->ip_dst,
IPPROTO_AH, ah->ah_spi)) == NULL)
return NULL;
if (sav->state != SADB_SASTATE_MATURE &&
sav->state != SADB_SASTATE_DYING) {
key_freesav(sav);
return NULL;
}
/* XXX Further validation? */
key_freesav(sav);
/*
* 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;
}
#endif
return NULL;
}
/* assumes that ip header and esp header are contiguous on mbuf */
void *
esp4_ctlinput(cmd, sa, v)
int cmd;
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;
#ifndef notyet
/* jonathan@NetBSD.org: XXX FIXME */
(void) ip; (void) esp; (void) icp; (void) sav;
#else
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 *)((caddr_t)ip + (ip->ip_hl << 2));
if ((sav = key_allocsa(AF_INET,
(caddr_t) &ip->ip_src,
(caddr_t) &ip->ip_dst,
IPPROTO_ESP, esp->esp_spi)) == NULL)
return NULL;
if (sav->state != SADB_SASTATE_MATURE &&
sav->state != SADB_SASTATE_DYING) {
key_freesav(sav);
return NULL;
}
/* XXX Further validation? */
key_freesav(sav);
/*
* 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;
}
#endif
return NULL;
}
#ifdef INET6
void
esp6_ctlinput(cmd, sa, d)
int cmd;
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;
struct sockaddr_in6 *sa6_src, *sa6_dst;
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.
*/
bzero(&ip6cp1, sizeof(ip6cp1));
ip6cp1.ip6c_src = ip6cp->ip6c_src;
pfctlinput2(cmd, sa, (void *)&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), (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.
*/
sa6_src = ip6cp->ip6c_src;
sa6_dst = (struct sockaddr_in6 *)sa;
#ifdef KAME
sav = key_allocsa(AF_INET6,
(caddr_t)&sa6_src->sin6_addr,
(caddr_t)&sa6_dst->sin6_addr,
IPPROTO_ESP, espp->esp_spi);
#else
/* jonathan@NetBSD.org: XXX FIXME */
(void)sa6_src; (void)sa6_dst;
sav = KEY_ALLOCSA((union sockaddr_union*)sa,
IPPROTO_ESP, espp->esp_spi);
#endif
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
}
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