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NetBSD/lib/libipsec/pfkey.c
itojun e5e6464767 upgrade libipsec to the latest. 
- parser now uses yacc/lex (there'll be no symbol conflict).
- outbound policy and inbound policy is now separate
- policy specification for tunnel SA is improved
- api changed, bump shlib major

XXX some of programs will become not buildable - will commit shortly
2000-01-31 14:15:30 +00:00

1425 lines
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/* $NetBSD: pfkey.c,v 1.6 2000/01/31 14:15:32 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, 1998, and 1999 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/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netkey/keyv2.h>
#include <netkey/key_var.h>
#include <netinet/in.h>
#include <netinet6/in6.h>
#include <netinet6/ipsec.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "ipsec_strerror.h"
#define CALLOC(size, cast) (cast)calloc(1, (size))
static int pfkey_send_x1 __P((int so, u_int type, u_int satype, u_int mode,
struct sockaddr *src, struct sockaddr *dst, u_int32_t spi,
u_int32_t reqid, u_int wsize,
caddr_t keymat,
u_int e_type, u_int e_keylen, u_int a_type, u_int a_keylen,
u_int flags,
u_int32_t l_alloc, u_int32_t l_bytes,
u_int32_t l_addtime, u_int32_t l_usetime, u_int32_t seq));
static int pfkey_send_x2 __P((int so, u_int type, u_int satype, u_int mode,
struct sockaddr *src, struct sockaddr *dst, u_int32_t spi));
static int pfkey_send_x3 __P((int so, u_int type, u_int satype));
static caddr_t pfkey_setsadbmsg __P((caddr_t buf, u_int type, u_int tlen,
u_int satype, u_int mode, u_int32_t reqid, u_int32_t seq, pid_t pid));
static caddr_t pfkey_setsadbsa __P((caddr_t buf, u_int32_t spi, u_int wsize,
u_int auth, u_int enc, u_int32_t flags));
static caddr_t pfkey_setsadbaddr __P((caddr_t buf, u_int exttype,
struct sockaddr *saddr, u_int prefixlen, u_int ul_proto));
static caddr_t pfkey_setsadbkey(caddr_t buf, u_int type,
caddr_t key, u_int keylen);
static caddr_t pfkey_setsadblifetime(caddr_t buf, u_int type,
u_int32_t l_alloc, u_int32_t l_bytes,
u_int32_t l_addtime, u_int32_t l_usetime);
/*
* check key length against algorithm specified.
* supported is either SADB_EXT_SUPPORTED_ENCRYPT or SADB_EXT_SUPPORTED_AUTH.
* Refer to keyv2.h to get more info.
* keylen is the unit of bit.
* OUT:
* -1: invalid.
* 0: valid.
*/
struct sadb_msg *ipsec_supported = NULL;
int
ipsec_check_keylen(supported, alg_id, keylen)
u_int supported;
u_int alg_id;
u_int keylen;
{
u_int tlen;
caddr_t p;
struct sadb_supported *sup;
struct sadb_alg *alg;
/* validity check */
if (ipsec_supported == NULL) {
ipsec_errcode = EIPSEC_DO_GET_SUPP_LIST;
return -1;
}
switch (supported) {
case SADB_EXT_SUPPORTED_AUTH:
case SADB_EXT_SUPPORTED_ENCRYPT:
break;
default:
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
tlen = ipsec_supported->sadb_msg_len - sizeof(struct sadb_msg);
p = (caddr_t)ipsec_supported + sizeof(struct sadb_msg);
for (;
tlen > 0;
tlen -= sup->sadb_supported_len, p += sup->sadb_supported_len) {
sup = (struct sadb_supported *)p;
if (sup->sadb_supported_exttype != supported)
continue;
{
u_int ttlen = sup->sadb_supported_len;
caddr_t pp = p + sizeof(*sup);
for (;
ttlen > 0;
ttlen -= sizeof(*alg), pp += sizeof(*alg)) {
alg = (struct sadb_alg *)pp;
if (alg->sadb_alg_id == alg_id)
goto found;
}
}
}
ipsec_errcode = EIPSEC_NOT_SUPPORTED;
return -1;
/* NOTREACHED */
found:
if (keylen < alg->sadb_alg_minbits
|| keylen > alg->sadb_alg_maxbits) {
ipsec_errcode = EIPSEC_INVAL_KEYLEN;
return -1;
}
ipsec_errcode = EIPSEC_NO_ERROR;
return 0;
}
/*
* set the rate for SOFT lifetime against HARD one.
* If rate is more than 100 or equal to zero, then set to 100.
*/
static u_int soft_lifetime_allocations_rate = PFKEY_SOFT_LIFETIME_RATE;
static u_int soft_lifetime_bytes_rate = PFKEY_SOFT_LIFETIME_RATE;
static u_int soft_lifetime_addtime_rate = PFKEY_SOFT_LIFETIME_RATE;
static u_int soft_lifetime_usetime_rate = PFKEY_SOFT_LIFETIME_RATE;
u_int
pfkey_set_softrate(type, rate)
u_int type, rate;
{
ipsec_errcode = EIPSEC_NO_ERROR;
if (rate > 100 || rate == 0)
rate = 100;
switch (type) {
case SADB_X_LIFETIME_ALLOCATIONS:
soft_lifetime_allocations_rate = rate;
return 0;
case SADB_X_LIFETIME_BYTES:
soft_lifetime_bytes_rate = rate;
return 0;
case SADB_X_LIFETIME_ADDTIME:
soft_lifetime_addtime_rate = rate;
return 0;
case SADB_X_LIFETIME_USETIME:
soft_lifetime_usetime_rate = rate;
return 0;
}
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return 1;
}
/*
* get current rate for SOFT lifetime against HARD one.
* ATTENTION: ~0 is returned if invalid type was passed.
*/
u_int
pfkey_get_softrate(type)
u_int type;
{
switch (type) {
case SADB_X_LIFETIME_ALLOCATIONS:
return soft_lifetime_allocations_rate;
case SADB_X_LIFETIME_BYTES:
return soft_lifetime_bytes_rate;
case SADB_X_LIFETIME_ADDTIME:
return soft_lifetime_addtime_rate;
case SADB_X_LIFETIME_USETIME:
return soft_lifetime_usetime_rate;
}
return ~0;
}
/*
* sending SADB_GETSPI message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_getspi(so, satype, mode, src, dst, min, max, reqid, seq)
int so;
u_int satype, mode;
struct sockaddr *src, *dst;
u_int32_t min, max, reqid, seq;
{
struct sadb_msg *newmsg;
int len;
int need_spirange = 0;
caddr_t p;
/* validity check */
if (src == NULL || dst == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if (src->sa_family != dst->sa_family) {
ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
return -1;
}
if (min > max || (min > 0 && min <= 255)) {
ipsec_errcode = EIPSEC_INVAL_SPI;
return -1;
}
/* create new sadb_msg to send. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(src->sa_len)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(dst->sa_len);
if (min > 255 && max < ~0) {
need_spirange++;
len += sizeof(struct sadb_spirange);
}
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
ipsec_set_strerror(strerror(errno));
return -1;
}
p = pfkey_setsadbmsg((caddr_t)newmsg, SADB_GETSPI,
len, satype, mode, reqid, seq, getpid());
/* set sadb_address for source */
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_SRC,
src,
_INALENBYAF(src->sa_family) << 3,
IPSEC_ULPROTO_ANY);
/* set sadb_address for destination */
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_DST,
dst,
_INALENBYAF(dst->sa_family) << 3,
IPSEC_ULPROTO_ANY);
/* proccessing spi range */
if (need_spirange) {
int _len = sizeof(struct sadb_spirange);
#define _SADB_SPIRANGE(p) ((struct sadb_spirange *)(p))
_SADB_SPIRANGE(p)->sadb_spirange_len = PFKEY_UNIT64(_len);
_SADB_SPIRANGE(p)->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
_SADB_SPIRANGE(p)->sadb_spirange_min = min;
_SADB_SPIRANGE(p)->sadb_spirange_max = max;
#undef _SADB_SPIRANGE(p)
p += _len;
}
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* sending SADB_UPDATE message to the kernel.
* The length of key material is a_keylen + e_keylen.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_update(so, satype, mode, src, dst, spi, reqid, wsize,
keymat, e_type, e_keylen, a_type, a_keylen, flags,
l_alloc, l_bytes, l_addtime, l_usetime, seq)
int so;
u_int satype, mode, wsize;
struct sockaddr *src, *dst;
u_int32_t spi, reqid;
caddr_t keymat;
u_int e_type, e_keylen, a_type, a_keylen, flags;
u_int32_t l_alloc;
u_int64_t l_bytes, l_addtime, l_usetime;
u_int32_t seq;
{
int len;
if ((len = pfkey_send_x1(so, SADB_UPDATE, satype, mode, src, dst, spi,
reqid, wsize,
keymat, e_type, e_keylen, a_type, a_keylen, flags,
l_alloc, l_bytes, l_addtime, l_usetime, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_ADD message to the kernel.
* The length of key material is a_keylen + e_keylen.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_add(so, satype, mode, src, dst, spi, reqid, wsize,
keymat, e_type, e_keylen, a_type, a_keylen, flags,
l_alloc, l_bytes, l_addtime, l_usetime, seq)
int so;
u_int satype, mode, wsize;
struct sockaddr *src, *dst;
u_int32_t spi, reqid;
caddr_t keymat;
u_int e_type, e_keylen, a_type, a_keylen, flags;
u_int32_t l_alloc;
u_int64_t l_bytes, l_addtime, l_usetime;
u_int32_t seq;
{
int len;
if ((len = pfkey_send_x1(so, SADB_ADD, satype, mode, src, dst, spi,
reqid, wsize,
keymat, e_type, e_keylen, a_type, a_keylen, flags,
l_alloc, l_bytes, l_addtime, l_usetime, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_DELETE message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_delete(so, satype, mode, src, dst, spi)
int so;
u_int satype, mode;
struct sockaddr *src, *dst;
u_int32_t spi;
{
int len;
if ((len = pfkey_send_x2(so, SADB_DELETE, satype, mode, src, dst, spi)) < 0)
return -1;
return len;
}
/*
* sending SADB_GET message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_get(so, satype, mode, src, dst, spi)
int so;
u_int satype, mode;
struct sockaddr *src, *dst;
u_int32_t spi;
{
int len;
if ((len = pfkey_send_x2(so, SADB_GET, satype, mode, src, dst, spi)) < 0)
return -1;
return len;
}
/*
* sending SADB_REGISTER message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_register(so, satype)
int so;
u_int satype;
{
int len;
if ((len = pfkey_send_x3(so, SADB_REGISTER, satype)) < 0)
return -1;
return len;
}
/*
* receiving SADB_REGISTER message from the kernel, and copy buffer for
* sadb_supported returned into ipsec_supported.
* OUT:
* 0: success and return length sent.
* -1: error occured, and set errno.
*/
int
pfkey_recv_register(so)
int so;
{
pid_t pid = getpid();
struct sadb_msg *newmsg;
struct sadb_supported *sup;
caddr_t p;
int tlen;
/* receive message */
do {
if ((newmsg = pfkey_recv(so)) == NULL)
return -1;
} while (newmsg->sadb_msg_type != SADB_REGISTER
|| newmsg->sadb_msg_pid != pid);
/* check and fix */
newmsg->sadb_msg_len = PFKEY_UNUNIT64(newmsg->sadb_msg_len);
tlen = newmsg->sadb_msg_len - sizeof(struct sadb_msg);
p = (caddr_t)newmsg + sizeof(struct sadb_msg);
while (tlen > 0) {
sup = (struct sadb_supported *)p;
switch (sup->sadb_supported_exttype) {
case SADB_EXT_SUPPORTED_AUTH:
case SADB_EXT_SUPPORTED_ENCRYPT:
sup->sadb_supported_len = PFKEY_EXTLEN(sup);
break;
default:
ipsec_errcode = EIPSEC_INVAL_SATYPE;
free(newmsg);
return -1;
}
tlen -= sup->sadb_supported_len;
p += sup->sadb_supported_len;
}
if (tlen < 0) {
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
if (ipsec_supported != NULL)
free(ipsec_supported);
ipsec_supported = newmsg;
ipsec_errcode = EIPSEC_NO_ERROR;
return 0;
}
/*
* sending SADB_FLUSH message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_flush(so, satype)
int so;
u_int satype;
{
int len;
if ((len = pfkey_send_x3(so, SADB_FLUSH, satype)) < 0)
return -1;
return len;
}
/*
* sending SADB_DUMP message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_dump(so, satype)
int so;
u_int satype;
{
int len;
if ((len = pfkey_send_x3(so, SADB_DUMP, satype)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_PROMISC message to the kernel.
* NOTE that this function handles promisc mode toggle only.
* IN:
* flag: set promisc off if zero, set promisc on if non-zero.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
* 0 : error occured, and set errno.
* others: a pointer to new allocated buffer in which supported
* algorithms is.
*/
int
pfkey_send_promisc_toggle(so, flag)
int so;
int flag;
{
int len;
if ((len = pfkey_send_x3(so, SADB_X_PROMISC, (flag ? 1 : 0))) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDADD message to the kernel.
* The length of key material is a_keylen + e_keylen.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_spdadd(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
char *policy;
int policylen;
u_int32_t seq;
{
struct sadb_msg *newmsg;
int len;
caddr_t p;
/* validity check */
if (src == NULL || dst == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if (src->sa_family != dst->sa_family) {
ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
return -1;
}
if (prefs > (_INALENBYAF(src->sa_family) << 3)
|| prefd > (_INALENBYAF(dst->sa_family) << 3)) {
ipsec_errcode = EIPSEC_INVAL_PREFIXLEN;
return -1;
}
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(_SALENBYAF(src->sa_family))
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(_SALENBYAF(src->sa_family))
+ policylen;
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
ipsec_set_strerror(strerror(errno));
return -1;
}
p = pfkey_setsadbmsg((caddr_t)newmsg, SADB_X_SPDADD, len,
SADB_SATYPE_UNSPEC, IPSEC_MODE_ANY, 0,
seq, getpid());
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_SRC,
src,
prefs,
proto);
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_DST,
dst,
prefd,
proto);
memcpy(p, policy, policylen);
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* sending SADB_X_SPDDELETE message to the kernel.
* The length of key material is a_keylen + e_keylen.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_spddelete(so, src, prefs, dst, prefd, proto, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
u_int32_t seq;
{
struct sadb_msg *newmsg;
int len;
caddr_t p;
/* validity check */
if (src == NULL || dst == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if (src->sa_family != dst->sa_family) {
ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
return -1;
}
if (prefs > (_INALENBYAF(src->sa_family) << 3)
|| prefd > (_INALENBYAF(dst->sa_family) << 3)) {
ipsec_errcode = EIPSEC_INVAL_PREFIXLEN;
return -1;
}
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(_SALENBYAF(src->sa_family))
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(_SALENBYAF(src->sa_family));
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
ipsec_set_strerror(strerror(errno));
return -1;
}
p = pfkey_setsadbmsg((caddr_t)newmsg, SADB_X_SPDDELETE, len,
SADB_SATYPE_UNSPEC, IPSEC_MODE_ANY, 0,
seq, getpid());
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_SRC,
src,
prefs,
proto);
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_DST,
dst,
prefd,
proto);
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* sending SADB_SPDFLUSH message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_spdflush(so)
int so;
{
int len;
if ((len = pfkey_send_x3(so, SADB_X_SPDFLUSH, SADB_SATYPE_UNSPEC)) < 0)
return -1;
return len;
}
/*
* sending SADB_SPDDUMP message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occured, and set errno.
*/
int
pfkey_send_spddump(so)
int so;
{
int len;
if ((len = pfkey_send_x3(so, SADB_X_SPDDUMP, SADB_SATYPE_UNSPEC)) < 0)
return -1;
return len;
}
/* sending SADB_ADD or SADB_UPDATE message to the kernel */
static int
pfkey_send_x1(so, type, satype, mode, src, dst, spi, reqid, wsize,
keymat, e_type, e_keylen, a_type, a_keylen, flags,
l_alloc, l_bytes, l_addtime, l_usetime, seq)
int so;
u_int type, satype, mode;
struct sockaddr *src, *dst;
u_int32_t spi, reqid;
u_int wsize;
caddr_t keymat;
u_int e_type, e_keylen, a_type, a_keylen, flags;
u_int32_t l_alloc, l_bytes, l_addtime, l_usetime, seq;
{
struct sadb_msg *newmsg;
int len;
caddr_t p;
/* validity check */
if (src == NULL || dst == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if (src->sa_family != dst->sa_family) {
ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
return -1;
}
switch (satype) {
case SADB_SATYPE_ESP:
if (e_type == SADB_EALG_NONE) {
ipsec_errcode = EIPSEC_NO_ALGS;
return -1;
}
break;
case SADB_SATYPE_AH:
if (e_type != SADB_EALG_NONE) {
ipsec_errcode = EIPSEC_INVAL_ALGS;
return -1;
}
if (a_type == SADB_AALG_NONE) {
ipsec_errcode = EIPSEC_NO_ALGS;
return -1;
}
break;
case SADB_X_SATYPE_IPCOMP:
break;
default:
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_sa)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(src->sa_len)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(dst->sa_len)
+ sizeof(struct sadb_lifetime)
+ sizeof(struct sadb_lifetime);
if (e_type != SADB_EALG_NONE)
len += (sizeof(struct sadb_key) + PFKEY_ALIGN8(e_keylen));
if (a_type != SADB_AALG_NONE)
len += (sizeof(struct sadb_key) + PFKEY_ALIGN8(a_keylen));
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
ipsec_set_strerror(strerror(errno));
return -1;
}
p = pfkey_setsadbmsg((caddr_t)newmsg, type, len,
satype, mode, reqid, seq, getpid());
p = pfkey_setsadbsa(p, spi, wsize, a_type, e_type, flags);
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_SRC,
src,
_INALENBYAF(src->sa_family) << 3,
IPSEC_ULPROTO_ANY);
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_DST,
dst,
_INALENBYAF(dst->sa_family) << 3,
IPSEC_ULPROTO_ANY);
if (e_type != SADB_EALG_NONE)
p = pfkey_setsadbkey(p, SADB_EXT_KEY_ENCRYPT,
keymat, e_keylen);
if (a_type != SADB_AALG_NONE)
p = pfkey_setsadbkey(p, SADB_EXT_KEY_AUTH,
keymat + e_keylen, a_keylen);
/* set sadb_lifetime for destination */
p = pfkey_setsadblifetime(p, SADB_EXT_LIFETIME_HARD,
l_alloc, l_bytes, l_addtime, l_usetime);
p = pfkey_setsadblifetime(p, SADB_EXT_LIFETIME_SOFT,
l_alloc, l_bytes, l_addtime, l_usetime);
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/* sending SADB_DELETE or SADB_GET message to the kernel */
static int
pfkey_send_x2(so, type, satype, mode, src, dst, spi)
int so;
u_int type, satype, mode;
struct sockaddr *src, *dst;
u_int32_t spi;
{
struct sadb_msg *newmsg;
int len;
caddr_t p;
/* validity check */
if (src == NULL || dst == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if (src->sa_family != dst->sa_family) {
ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
return -1;
}
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_sa)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(src->sa_len)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(dst->sa_len);
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
ipsec_set_strerror(strerror(errno));
return -1;
}
p = pfkey_setsadbmsg((caddr_t)newmsg, type, len, satype, mode, 0, 0, getpid());
p = pfkey_setsadbsa(p, spi, 0, 0, 0, 0);
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_SRC,
src,
_INALENBYAF(src->sa_family) << 3,
IPSEC_ULPROTO_ANY);
p = pfkey_setsadbaddr(p,
SADB_EXT_ADDRESS_DST,
dst,
_INALENBYAF(dst->sa_family) << 3,
IPSEC_ULPROTO_ANY);
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* sending SADB_REGISTER, SADB_FLUSH, SADB_DUMP or SADB_X_PROMISC message
* to the kernel
*/
static int
pfkey_send_x3(so, type, satype)
int so;
u_int type, satype;
{
struct sadb_msg *newmsg;
int len;
/* validity check */
switch (type) {
case SADB_X_PROMISC:
if (satype != 0 && satype != 1) {
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
break;
default:
switch (satype) {
case SADB_SATYPE_UNSPEC:
case SADB_SATYPE_AH:
case SADB_SATYPE_ESP:
case SADB_X_SATYPE_IPCOMP:
break;
default:
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
}
/* create new sadb_msg to send. */
len = sizeof(struct sadb_msg);
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
ipsec_set_strerror(strerror(errno));
return -1;
}
(void)pfkey_setsadbmsg((caddr_t)newmsg, type, len, satype, 0, 0, 0, getpid());
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* open a socket.
* OUT:
* -1: fail.
* others : success and return value of socket.
*/
int
pfkey_open()
{
int so;
const int bufsiz = 128 * 1024; /*is 128K enough?*/
if ((so = socket(PF_KEY, SOCK_RAW, PF_KEY_V2)) < 0) {
ipsec_set_strerror(strerror(errno));
return -1;
}
/*
* This is a temporary workaround for KAME PR 154.
* Don't really care even if it fails.
*/
(void)setsockopt(so, SOL_SOCKET, SO_SNDBUF, &bufsiz, sizeof(bufsiz));
(void)setsockopt(so, SOL_SOCKET, SO_RCVBUF, &bufsiz, sizeof(bufsiz));
ipsec_errcode = EIPSEC_NO_ERROR;
return so;
}
/*
* close a socket.
* OUT:
* 0: success.
* -1: fail.
*/
void
pfkey_close(so)
int so;
{
(void)close(so);
ipsec_errcode = EIPSEC_NO_ERROR;
return;
}
/*
* receive sadb_msg data, and return pointer to new buffer allocated.
* Must free this buffer later.
* OUT:
* NULL : error occured.
* others : a pointer to sadb_msg structure.
*/
struct sadb_msg *
pfkey_recv(so)
int so;
{
struct sadb_msg buf, *newmsg;
int len, reallen;
while ((len = recv(so, (caddr_t)&buf, sizeof(buf), MSG_PEEK)) < 0) {
if (errno == EINTR) continue;
ipsec_set_strerror(strerror(errno));
return NULL;
}
if (len < sizeof(buf)) {
recv(so, (caddr_t)&buf, sizeof(buf), 0);
ipsec_errcode = EIPSEC_MAX;
return NULL;
}
/* read real message */
reallen = PFKEY_UNUNIT64(buf.sadb_msg_len);
if ((newmsg = CALLOC(reallen, struct sadb_msg *)) == 0) {
ipsec_set_strerror(strerror(errno));
return NULL;
}
while ((len = recv(so, (caddr_t)newmsg, reallen, 0)) < 0) {
if (errno == EINTR) continue;
ipsec_set_strerror(strerror(errno));
free(newmsg);
return NULL;
}
if (len != reallen) {
ipsec_errcode = EIPSEC_SYSTEM_ERROR;
free(newmsg);
return NULL;
}
ipsec_errcode = EIPSEC_NO_ERROR;
return newmsg;
}
/*
* send message to a socket.
* OUT:
* others: success and return length sent.
* -1 : fail.
*/
int
pfkey_send(so, msg, len)
int so;
struct sadb_msg *msg;
int len;
{
if ((len = send(so, (caddr_t)msg, len, 0)) < 0) {
ipsec_set_strerror(strerror(errno));
return -1;
}
ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* %%% Utilities
* NOTE: These functions are derived from netkey/key.c in KAME.
*/
/*
* set the pointer to each header in this message buffer.
* IN: msg: pointer to message buffer.
* mhp: pointer to the buffer initialized like below:
* caddr_t mhp[SADB_EXT_MAX + 1];
* OUT: -1: invalid.
* 0: valid.
*/
int
pfkey_align(msg, mhp)
struct sadb_msg *msg;
caddr_t *mhp;
{
struct sadb_ext *ext;
int tlen, extlen;
int i;
/* validity check */
if (msg == NULL || mhp == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
/* initialize */
for (i = 0; i < SADB_EXT_MAX + 1; i++)
mhp[i] = NULL;
mhp[0] = (caddr_t)msg;
tlen = PFKEY_UNUNIT64(msg->sadb_msg_len) - sizeof(struct sadb_msg);
ext = (struct sadb_ext *)((caddr_t)msg + sizeof(struct sadb_msg));
while (tlen > 0) {
/* duplicate check */
/* XXX Are there duplication either KEY_AUTH or KEY_ENCRYPT ?*/
if (mhp[ext->sadb_ext_type] != NULL) {
ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
return -1;
}
/* set pointer */
switch (ext->sadb_ext_type) {
case SADB_EXT_SA:
case SADB_EXT_LIFETIME_CURRENT:
case SADB_EXT_LIFETIME_HARD:
case SADB_EXT_LIFETIME_SOFT:
case SADB_EXT_ADDRESS_SRC:
case SADB_EXT_ADDRESS_DST:
case SADB_EXT_ADDRESS_PROXY:
case SADB_EXT_KEY_AUTH:
/* XXX should to be check weak keys. */
case SADB_EXT_KEY_ENCRYPT:
/* XXX should to be check weak keys. */
case SADB_EXT_IDENTITY_SRC:
case SADB_EXT_IDENTITY_DST:
case SADB_EXT_SENSITIVITY:
case SADB_EXT_PROPOSAL:
case SADB_EXT_SUPPORTED_AUTH:
case SADB_EXT_SUPPORTED_ENCRYPT:
case SADB_EXT_SPIRANGE:
case SADB_X_EXT_POLICY:
mhp[ext->sadb_ext_type] = (caddr_t)ext;
break;
default:
ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
return -1;
}
extlen = PFKEY_EXTLEN(ext);
tlen -= extlen;
ext = (struct sadb_ext *)((caddr_t)ext + extlen);
}
ipsec_errcode = EIPSEC_NO_ERROR;
return 0;
}
/*
* check basic usage for sadb_msg,
* NOTE: This routine is derived from netkey/key.c in KAME.
* IN: msg: pointer to message buffer.
* mhp: pointer to the buffer initialized like below:
*
* caddr_t mhp[SADB_EXT_MAX + 1];
*
* OUT: -1: invalid.
* 0: valid.
*/
int
pfkey_check(mhp)
caddr_t *mhp;
{
struct sadb_msg *msg;
/* validity check */
if (mhp == NULL || mhp[0] == NULL) {
ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
msg = (struct sadb_msg *)mhp[0];
/* check version */
if (msg->sadb_msg_version != PF_KEY_V2) {
ipsec_errcode = EIPSEC_INVAL_VERSION;
return -1;
}
/* check type */
if (msg->sadb_msg_type > SADB_MAX) {
ipsec_errcode = EIPSEC_INVAL_MSGTYPE;
return -1;
}
/* check SA type */
switch (msg->sadb_msg_satype) {
case SADB_SATYPE_UNSPEC:
switch (msg->sadb_msg_type) {
case SADB_GETSPI:
case SADB_UPDATE:
case SADB_ADD:
case SADB_DELETE:
case SADB_GET:
case SADB_ACQUIRE:
case SADB_EXPIRE:
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
break;
case SADB_SATYPE_ESP:
case SADB_SATYPE_AH:
case SADB_X_SATYPE_IPCOMP:
switch (msg->sadb_msg_type) {
case SADB_X_SPDADD:
case SADB_X_SPDDELETE:
case SADB_X_SPDGET:
case SADB_X_SPDDUMP:
case SADB_X_SPDFLUSH:
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
break;
case SADB_SATYPE_RSVP:
case SADB_SATYPE_OSPFV2:
case SADB_SATYPE_RIPV2:
case SADB_SATYPE_MIP:
ipsec_errcode = EIPSEC_NOT_SUPPORTED;
return -1;
case 1: /* XXX: What does it do ? */
if (msg->sadb_msg_type == SADB_X_PROMISC)
break;
/*FALLTHROUGH*/
default:
ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
/* check field of upper layer protocol and address family */
if (mhp[SADB_EXT_ADDRESS_SRC] != NULL
&& mhp[SADB_EXT_ADDRESS_DST] != NULL) {
struct sadb_address *src0, *dst0;
src0 = (struct sadb_address *)(mhp[SADB_EXT_ADDRESS_SRC]);
dst0 = (struct sadb_address *)(mhp[SADB_EXT_ADDRESS_DST]);
if (src0->sadb_address_proto != dst0->sadb_address_proto) {
ipsec_errcode = EIPSEC_PROTO_MISMATCH;
return -1;
}
if (PFKEY_ADDR_SADDR(src0)->sa_family
!= PFKEY_ADDR_SADDR(dst0)->sa_family) {
ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
return -1;
}
switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
case AF_INET:
case AF_INET6:
break;
default:
ipsec_errcode = EIPSEC_INVAL_FAMILY;
return -1;
}
/*
* prefixlen == 0 is valid because there must be the case
* all addresses are matched.
*/
}
ipsec_errcode = EIPSEC_NO_ERROR;
return 0;
}
/*
* set data into sadb_msg.
* `buf' must has been allocated sufficiently.
*/
static caddr_t
pfkey_setsadbmsg(buf, type, tlen, satype, mode, reqid, seq, pid)
caddr_t buf;
u_int type, satype, mode;
u_int tlen;
u_int32_t reqid, seq;
pid_t pid;
{
struct sadb_msg *p;
u_int len;
p = (struct sadb_msg *)buf;
len = sizeof(struct sadb_msg);
memset(p, 0, len);
p->sadb_msg_version = PF_KEY_V2;
p->sadb_msg_type = type;
p->sadb_msg_errno = 0;
p->sadb_msg_satype = satype;
p->sadb_msg_len = PFKEY_UNIT64(tlen);
p->sadb_msg_mode = mode;
p->sadb_msg_reserved1 = 0;
p->sadb_msg_seq = seq;
p->sadb_msg_pid = (u_int32_t)pid;
p->sadb_msg_reqid = reqid;
p->sadb_msg_reserved2 = 0;
return(buf + len);
}
/*
* copy secasvar data into sadb_address.
* `buf' must has been allocated sufficiently.
*/
static caddr_t
pfkey_setsadbsa(buf, spi, wsize, auth, enc, flags)
caddr_t buf;
u_int32_t spi, flags;
u_int wsize, auth, enc;
{
struct sadb_sa *p;
u_int len;
p = (struct sadb_sa *)buf;
len = sizeof(struct sadb_sa);
memset(p, 0, len);
p->sadb_sa_len = PFKEY_UNIT64(len);
p->sadb_sa_exttype = SADB_EXT_SA;
p->sadb_sa_spi = spi;
p->sadb_sa_replay = wsize;
p->sadb_sa_state = SADB_SASTATE_LARVAL;
p->sadb_sa_auth = auth;
p->sadb_sa_encrypt = enc;
p->sadb_sa_flags = flags;
return(buf + len);
}
/*
* set data into sadb_address.
* `buf' must has been allocated sufficiently.
* prefixlen is in bits.
*/
static caddr_t
pfkey_setsadbaddr(buf, exttype, saddr, prefixlen, ul_proto)
caddr_t buf;
u_int exttype;
struct sockaddr *saddr;
u_int prefixlen;
u_int ul_proto;
{
struct sadb_address *p;
u_int len;
p = (struct sadb_address *)buf;
len = sizeof(struct sadb_address) + PFKEY_ALIGN8(saddr->sa_len);
memset(p, 0, len);
p->sadb_address_len = PFKEY_UNIT64(len);
p->sadb_address_exttype = exttype & 0xffff;
p->sadb_address_proto = ul_proto & 0xff;
p->sadb_address_prefixlen = prefixlen;
p->sadb_address_reserved = 0;
memcpy(p + 1, saddr, saddr->sa_len);
return(buf + len);
}
/*
* set sadb_key structure after clearing buffer with zero.
* OUT: the pointer of buf + len.
*/
static caddr_t
pfkey_setsadbkey(buf, type, key, keylen)
caddr_t buf, key;
u_int type, keylen;
{
struct sadb_key *p;
u_int len;
p = (struct sadb_key *)buf;
len = sizeof(struct sadb_key) + PFKEY_ALIGN8(keylen);
memset(p, 0, len);
p->sadb_key_len = PFKEY_UNIT64(len);
p->sadb_key_exttype = type;
p->sadb_key_bits = keylen << 3;
p->sadb_key_reserved = 0;
memcpy(p + 1, key, keylen);
return buf + len;
}
/*
* set sadb_lifetime structure after clearing buffer with zero.
* OUT: the pointer of buf + len.
*/
static caddr_t
pfkey_setsadblifetime(buf, type, l_alloc, l_bytes, l_addtime, l_usetime)
caddr_t buf;
u_int type;
u_int32_t l_alloc, l_bytes, l_addtime, l_usetime;
{
struct sadb_lifetime *p;
u_int len;
p = (struct sadb_lifetime *)buf;
len = sizeof(struct sadb_lifetime);
memset(p, 0, len);
p->sadb_lifetime_len = PFKEY_UNIT64(len);
p->sadb_lifetime_exttype = type;
switch (type) {
case SADB_EXT_LIFETIME_SOFT:
p->sadb_lifetime_allocations
= (l_alloc * soft_lifetime_allocations_rate) /100;
p->sadb_lifetime_bytes
= (l_bytes * soft_lifetime_bytes_rate) /100;
p->sadb_lifetime_addtime
= (l_addtime * soft_lifetime_addtime_rate) /100;
p->sadb_lifetime_usetime
= (l_usetime * soft_lifetime_usetime_rate) /100;
break;
case SADB_EXT_LIFETIME_HARD:
p->sadb_lifetime_allocations = l_alloc;
p->sadb_lifetime_bytes = l_bytes;
p->sadb_lifetime_addtime = l_addtime;
p->sadb_lifetime_usetime = l_usetime;
break;
}
return buf + len;
}
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