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freebsd-skq/lib/libipsec/pfkey.c
Gordon Bergling 5666643a95 Fix some common typos in comments 
- occured -> occurred
- normaly -> normally
- controling -> controlling
- fileds -> fields
- insterted -> inserted
- outputing -> outputting

MFC after:	1 week
2021-03-13 18:26:15 +01:00

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/* $KAME: pfkey.c,v 1.46 2003/08/26 03:37:06 itojun Exp $ */
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/pfkeyv2.h>
#include <netipsec/key_var.h>
#include <netinet/in.h>
#include <netipsec/ipsec.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "ipsec_strerror.h"
#include "libpfkey.h"
#define CALLOC(size, cast) (cast)calloc(1, (size))
static int findsupportedmap(int);
static int setsupportedmap(struct sadb_supported *);
static struct sadb_alg *findsupportedalg(u_int, u_int);
static int pfkey_send_x1(int, u_int, u_int, u_int, struct sockaddr *,
struct sockaddr *, u_int32_t, u_int32_t, u_int, caddr_t,
u_int, u_int, u_int, u_int, u_int, u_int32_t, u_int32_t,
u_int32_t, u_int32_t, u_int32_t);
static int pfkey_send_x2(int, u_int, u_int, u_int,
struct sockaddr *, struct sockaddr *, u_int32_t);
static int pfkey_send_x3(int, u_int, u_int);
static int pfkey_send_x4(int, u_int, struct sockaddr *, u_int,
struct sockaddr *, u_int, u_int, u_int64_t, u_int64_t,
char *, int, u_int32_t);
static int pfkey_send_x5(int, u_int, u_int32_t);
static caddr_t pfkey_setsadbmsg(caddr_t, caddr_t, u_int, u_int,
u_int, u_int32_t, pid_t);
static caddr_t pfkey_setsadbsa(caddr_t, caddr_t, u_int32_t, u_int,
u_int, u_int, u_int32_t);
static caddr_t pfkey_setsadbxreplay(caddr_t, caddr_t, uint32_t);
static caddr_t pfkey_setsadbaddr(caddr_t, caddr_t, u_int,
struct sockaddr *, u_int, u_int);
static caddr_t pfkey_setsadbkey(caddr_t, caddr_t, u_int, caddr_t, u_int);
static caddr_t pfkey_setsadblifetime(caddr_t, caddr_t, u_int, u_int32_t,
u_int32_t, u_int32_t, u_int32_t);
static caddr_t pfkey_setsadbxsa2(caddr_t, caddr_t, u_int32_t, u_int32_t);
/*
* make and search supported algorithm structure.
*/
static struct sadb_supported *ipsec_supported[] = { NULL, NULL, NULL, NULL };
static int supported_map[] = {
SADB_SATYPE_AH,
SADB_SATYPE_ESP,
SADB_X_SATYPE_IPCOMP,
SADB_X_SATYPE_TCPSIGNATURE
};
static int
findsupportedmap(satype)
int satype;
{
int i;
for (i = 0; i < sizeof(supported_map)/sizeof(supported_map[0]); i++)
if (supported_map[i] == satype)
return i;
return -1;
}
static struct sadb_alg *
findsupportedalg(satype, alg_id)
u_int satype, alg_id;
{
int algno;
int tlen;
caddr_t p;
/* validity check */
algno = findsupportedmap(satype);
if (algno == -1) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return NULL;
}
if (ipsec_supported[algno] == NULL) {
__ipsec_errcode = EIPSEC_DO_GET_SUPP_LIST;
return NULL;
}
tlen = ipsec_supported[algno]->sadb_supported_len
- sizeof(struct sadb_supported);
p = (caddr_t)(ipsec_supported[algno] + 1);
while (tlen > 0) {
if (tlen < sizeof(struct sadb_alg)) {
/* invalid format */
break;
}
if (((struct sadb_alg *)p)->sadb_alg_id == alg_id)
return (struct sadb_alg *)p;
tlen -= sizeof(struct sadb_alg);
p += sizeof(struct sadb_alg);
}
__ipsec_errcode = EIPSEC_NOT_SUPPORTED;
return NULL;
}
static int
setsupportedmap(sup)
struct sadb_supported *sup;
{
struct sadb_supported **ipsup;
switch (sup->sadb_supported_exttype) {
case SADB_EXT_SUPPORTED_AUTH:
ipsup = &ipsec_supported[findsupportedmap(SADB_SATYPE_AH)];
break;
case SADB_EXT_SUPPORTED_ENCRYPT:
ipsup = &ipsec_supported[findsupportedmap(SADB_SATYPE_ESP)];
break;
default:
__ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
if (*ipsup)
free(*ipsup);
*ipsup = malloc(sup->sadb_supported_len);
if (!*ipsup) {
__ipsec_set_strerror(strerror(errno));
return -1;
}
memcpy(*ipsup, sup, sup->sadb_supported_len);
return 0;
}
/*
* check key length against algorithm specified.
* This function is called with SADB_EXT_SUPPORTED_{AUTH,ENCRYPT} as the
* augument, and only calls to ipsec_check_keylen2();
* keylen is the unit of bit.
* OUT:
* -1: invalid.
* 0: valid.
*/
int
ipsec_check_keylen(supported, alg_id, keylen)
u_int supported;
u_int alg_id;
u_int keylen;
{
int satype;
/* validity check */
switch (supported) {
case SADB_EXT_SUPPORTED_AUTH:
satype = SADB_SATYPE_AH;
break;
case SADB_EXT_SUPPORTED_ENCRYPT:
satype = SADB_SATYPE_ESP;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
return ipsec_check_keylen2(satype, alg_id, keylen);
}
/*
* check key length against algorithm specified.
* satype is one of satype defined at pfkeyv2.h.
* keylen is the unit of bit.
* OUT:
* -1: invalid.
* 0: valid.
*/
int
ipsec_check_keylen2(satype, alg_id, keylen)
u_int satype;
u_int alg_id;
u_int keylen;
{
struct sadb_alg *alg;
alg = findsupportedalg(satype, alg_id);
if (!alg)
return -1;
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;
}
/*
* get max/min key length against algorithm specified.
* satype is one of satype defined at pfkeyv2.h.
* keylen is the unit of bit.
* OUT:
* -1: invalid.
* 0: valid.
*/
int
ipsec_get_keylen(supported, alg_id, alg0)
u_int supported, alg_id;
struct sadb_alg *alg0;
{
struct sadb_alg *alg;
u_int satype;
/* validity check */
if (!alg0) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
switch (supported) {
case SADB_EXT_SUPPORTED_AUTH:
satype = SADB_SATYPE_AH;
break;
case SADB_EXT_SUPPORTED_ENCRYPT:
satype = SADB_SATYPE_ESP;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
alg = findsupportedalg(satype, alg_id);
if (!alg)
return -1;
memcpy(alg0, alg, sizeof(*alg0));
__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 occurred, 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;
caddr_t ep;
int len;
int need_spirange = 0;
caddr_t p;
int plen;
/* 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;
}
switch (src->sa_family) {
case AF_INET:
plen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
plen = sizeof(struct in6_addr) << 3;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_FAMILY;
return -1;
}
/* create new sadb_msg to send. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_x_sa2)
+ 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;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, SADB_GETSPI,
len, satype, seq, getpid());
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbxsa2(p, ep, mode, reqid);
if (!p) {
free(newmsg);
return -1;
}
/* set sadb_address for source */
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
IPSEC_ULPROTO_ANY);
if (!p) {
free(newmsg);
return -1;
}
/* set sadb_address for destination */
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
IPSEC_ULPROTO_ANY);
if (!p) {
free(newmsg);
return -1;
}
/* proccessing spi range */
if (need_spirange) {
struct sadb_spirange spirange;
if (p + sizeof(spirange) > ep) {
free(newmsg);
return -1;
}
memset(&spirange, 0, sizeof(spirange));
spirange.sadb_spirange_len = PFKEY_UNIT64(sizeof(spirange));
spirange.sadb_spirange_exttype = SADB_EXT_SPIRANGE;
spirange.sadb_spirange_min = min;
spirange.sadb_spirange_max = max;
memcpy(p, &spirange, sizeof(spirange));
p += sizeof(spirange);
}
if (p != ep) {
free(newmsg);
return -1;
}
/* 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 occurred, 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 occurred, 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 occurred, 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_DELETE without spi to the kernel. This is
* the "delete all" request (an extension also present in
* Solaris).
*
* OUT:
* positive: success and return length sent
* -1 : error occurred, and set errno
*/
int
pfkey_send_delete_all(so, satype, mode, src, dst)
int so;
u_int satype, mode;
struct sockaddr *src, *dst;
{
struct sadb_msg *newmsg;
int len;
caddr_t p;
int plen;
caddr_t ep;
/* 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 (src->sa_family) {
case AF_INET:
plen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
plen = sizeof(struct in6_addr) << 3;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_FAMILY;
return -1;
}
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ 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;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, SADB_DELETE, len, satype, 0,
getpid());
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
IPSEC_ULPROTO_ANY);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
IPSEC_ULPROTO_ANY);
if (!p || p != ep) {
free(newmsg);
return -1;
}
/* send message */
len = pfkey_send(so, newmsg, len);
free(newmsg);
if (len < 0)
return -1;
__ipsec_errcode = EIPSEC_NO_ERROR;
return len;
}
/*
* sending SADB_GET message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, 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 occurred, and set errno.
*/
int
pfkey_send_register(so, satype)
int so;
u_int satype;
{
int len, algno;
if (satype == SADB_SATYPE_UNSPEC) {
for (algno = 0;
algno < sizeof(supported_map)/sizeof(supported_map[0]);
algno++) {
if (ipsec_supported[algno]) {
free(ipsec_supported[algno]);
ipsec_supported[algno] = NULL;
}
}
} else {
algno = findsupportedmap(satype);
if (algno == -1) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if (ipsec_supported[algno]) {
free(ipsec_supported[algno]);
ipsec_supported[algno] = NULL;
}
}
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 occurred, and set errno.
*/
int
pfkey_recv_register(so)
int so;
{
pid_t pid = getpid();
struct sadb_msg *newmsg;
int error = -1;
/* receive message */
for (;;) {
if ((newmsg = pfkey_recv(so)) == NULL)
return -1;
if (newmsg->sadb_msg_type == SADB_REGISTER &&
newmsg->sadb_msg_pid == pid)
break;
free(newmsg);
}
/* check and fix */
newmsg->sadb_msg_len = PFKEY_UNUNIT64(newmsg->sadb_msg_len);
error = pfkey_set_supported(newmsg, newmsg->sadb_msg_len);
free(newmsg);
if (error == 0)
__ipsec_errcode = EIPSEC_NO_ERROR;
return error;
}
/*
* receiving SADB_REGISTER message from the kernel, and copy buffer for
* sadb_supported returned into ipsec_supported.
* NOTE: sadb_msg_len must be host order.
* IN:
* tlen: msg length, it's to makeing sure.
* OUT:
* 0: success and return length sent.
* -1: error occurred, and set errno.
*/
int
pfkey_set_supported(msg, tlen)
struct sadb_msg *msg;
int tlen;
{
struct sadb_supported *sup;
caddr_t p;
caddr_t ep;
/* validity */
if (msg->sadb_msg_len != tlen) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
p = (caddr_t)msg;
ep = p + tlen;
p += sizeof(struct sadb_msg);
while (p < ep) {
sup = (struct sadb_supported *)p;
if (ep < p + sizeof(*sup) ||
PFKEY_EXTLEN(sup) < sizeof(*sup) ||
ep < p + sup->sadb_supported_len) {
/* invalid format */
break;
}
switch (sup->sadb_supported_exttype) {
case SADB_EXT_SUPPORTED_AUTH:
case SADB_EXT_SUPPORTED_ENCRYPT:
break;
default:
__ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
/* fixed length */
sup->sadb_supported_len = PFKEY_EXTLEN(sup);
/* set supported map */
if (setsupportedmap(sup) != 0)
return -1;
p += sup->sadb_supported_len;
}
if (p != ep) {
__ipsec_errcode = EIPSEC_INVAL_SATYPE;
return -1;
}
__ipsec_errcode = EIPSEC_NO_ERROR;
return 0;
}
/*
* sending SADB_FLUSH message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, 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 occurred, 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 occurred, and set errno.
* 0 : error occurred, 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.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, 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;
caddr_t policy;
int policylen;
u_int32_t seq;
{
int len;
if ((len = pfkey_send_x4(so, SADB_X_SPDADD,
src, prefs, dst, prefd, proto,
0, 0,
policy, policylen, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDADD message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spdadd2(so, src, prefs, dst, prefd, proto, ltime, vtime,
policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
u_int64_t ltime, vtime;
caddr_t policy;
int policylen;
u_int32_t seq;
{
int len;
if ((len = pfkey_send_x4(so, SADB_X_SPDADD,
src, prefs, dst, prefd, proto,
ltime, vtime,
policy, policylen, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDUPDATE message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spdupdate(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
caddr_t policy;
int policylen;
u_int32_t seq;
{
int len;
if ((len = pfkey_send_x4(so, SADB_X_SPDUPDATE,
src, prefs, dst, prefd, proto,
0, 0,
policy, policylen, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDUPDATE message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spdupdate2(so, src, prefs, dst, prefd, proto, ltime, vtime,
policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
u_int64_t ltime, vtime;
caddr_t policy;
int policylen;
u_int32_t seq;
{
int len;
if ((len = pfkey_send_x4(so, SADB_X_SPDUPDATE,
src, prefs, dst, prefd, proto,
ltime, vtime,
policy, policylen, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDDELETE message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spddelete(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
caddr_t policy;
int policylen;
u_int32_t seq;
{
int len;
if (policylen != sizeof(struct sadb_x_policy)) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if ((len = pfkey_send_x4(so, SADB_X_SPDDELETE,
src, prefs, dst, prefd, proto,
0, 0,
policy, policylen, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDDELETE message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spddelete2(so, spid)
int so;
u_int32_t spid;
{
int len;
if ((len = pfkey_send_x5(so, SADB_X_SPDDELETE2, spid)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDGET message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spdget(so, spid)
int so;
u_int32_t spid;
{
int len;
if ((len = pfkey_send_x5(so, SADB_X_SPDGET, spid)) < 0)
return -1;
return len;
}
/*
* sending SADB_X_SPDSETIDX message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, and set errno.
*/
int
pfkey_send_spdsetidx(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int prefs, prefd, proto;
caddr_t policy;
int policylen;
u_int32_t seq;
{
int len;
if (policylen != sizeof(struct sadb_x_policy)) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return -1;
}
if ((len = pfkey_send_x4(so, SADB_X_SPDSETIDX,
src, prefs, dst, prefd, proto,
0, 0,
policy, policylen, seq)) < 0)
return -1;
return len;
}
/*
* sending SADB_SPDFLUSH message to the kernel.
* OUT:
* positive: success and return length sent.
* -1 : error occurred, 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 occurred, 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;
int plen;
caddr_t ep;
/* 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 (src->sa_family) {
case AF_INET:
plen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
plen = sizeof(struct in6_addr) << 3;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_FAMILY;
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:
if (e_type == SADB_X_CALG_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_TCPSIGNATURE:
if (e_type != SADB_EALG_NONE) {
__ipsec_errcode = EIPSEC_INVAL_ALGS;
return -1;
}
if (a_type != SADB_X_AALG_TCP_MD5) {
__ipsec_errcode = EIPSEC_INVAL_ALGS;
return -1;
}
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_x_sa2)
+ 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 (wsize > UINT8_MAX) {
if (wsize > (UINT32_MAX - 32) >> 3) {
__ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
return (-1);
}
len += sizeof(struct sadb_x_sa_replay);
}
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;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
satype, seq, getpid());
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbsa(p, ep, spi, wsize, a_type, e_type, flags);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbxsa2(p, ep, mode, reqid);
if (!p) {
free(newmsg);
return -1;
}
if (wsize > UINT8_MAX) {
p = pfkey_setsadbxreplay(p, ep, wsize);
if (!p) {
free(newmsg);
return (-1);
}
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
IPSEC_ULPROTO_ANY);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
IPSEC_ULPROTO_ANY);
if (!p) {
free(newmsg);
return -1;
}
if (e_type != SADB_EALG_NONE) {
p = pfkey_setsadbkey(p, ep, SADB_EXT_KEY_ENCRYPT,
keymat, e_keylen);
if (!p) {
free(newmsg);
return -1;
}
}
if (a_type != SADB_AALG_NONE) {
p = pfkey_setsadbkey(p, ep, SADB_EXT_KEY_AUTH,
keymat + e_keylen, a_keylen);
if (!p) {
free(newmsg);
return -1;
}
}
/* set sadb_lifetime for destination */
p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_HARD,
l_alloc, l_bytes, l_addtime, l_usetime);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_SOFT,
l_alloc, l_bytes, l_addtime, l_usetime);
if (!p || p != ep) {
free(newmsg);
return -1;
}
/* 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;
int plen;
caddr_t ep;
/* 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 (src->sa_family) {
case AF_INET:
plen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
plen = sizeof(struct in6_addr) << 3;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_FAMILY;
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;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len, satype, 0,
getpid());
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbsa(p, ep, spi, 0, 0, 0, 0);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
IPSEC_ULPROTO_ANY);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
IPSEC_ULPROTO_ANY);
if (!p || p != ep) {
free(newmsg);
return -1;
}
/* 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;
caddr_t p;
caddr_t ep;
/* 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:
case SADB_X_SATYPE_TCPSIGNATURE:
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;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len, satype, 0,
getpid());
if (!p || p != ep) {
free(newmsg);
return -1;
}
/* 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_SPDADD message to the kernel */
static int
pfkey_send_x4(so, type, src, prefs, dst, prefd, proto,
ltime, vtime, policy, policylen, seq)
int so;
struct sockaddr *src, *dst;
u_int type, prefs, prefd, proto;
u_int64_t ltime, vtime;
char *policy;
int policylen;
u_int32_t seq;
{
struct sadb_msg *newmsg;
int len;
caddr_t p;
int plen;
caddr_t ep;
/* 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 (src->sa_family) {
case AF_INET:
plen = sizeof(struct in_addr) << 3;
break;
case AF_INET6:
plen = sizeof(struct in6_addr) << 3;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_FAMILY;
return -1;
}
if (prefs > plen || prefd > plen) {
__ipsec_errcode = EIPSEC_INVAL_PREFIXLEN;
return -1;
}
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(src->sa_len)
+ sizeof(struct sadb_address)
+ PFKEY_ALIGN8(src->sa_len)
+ sizeof(struct sadb_lifetime)
+ policylen;
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
__ipsec_set_strerror(strerror(errno));
return -1;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
SADB_SATYPE_UNSPEC, seq, getpid());
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, prefs, proto);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, prefd, proto);
if (!p) {
free(newmsg);
return -1;
}
p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_HARD,
0, 0, ltime, vtime);
if (!p || p + policylen != ep) {
free(newmsg);
return -1;
}
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_SPDGET or SADB_X_SPDDELETE message to the kernel */
static int
pfkey_send_x5(so, type, spid)
int so;
u_int type;
u_int32_t spid;
{
struct sadb_msg *newmsg;
struct sadb_x_policy xpl;
int len;
caddr_t p;
caddr_t ep;
/* create new sadb_msg to reply. */
len = sizeof(struct sadb_msg)
+ sizeof(xpl);
if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
__ipsec_set_strerror(strerror(errno));
return -1;
}
ep = ((caddr_t)newmsg) + len;
p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
SADB_SATYPE_UNSPEC, 0, getpid());
if (!p) {
free(newmsg);
return -1;
}
if (p + sizeof(xpl) != ep) {
free(newmsg);
return -1;
}
memset(&xpl, 0, sizeof(xpl));
xpl.sadb_x_policy_len = PFKEY_UNIT64(sizeof(xpl));
xpl.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
xpl.sadb_x_policy_id = spid;
memcpy(p, &xpl, sizeof(xpl));
/* 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(void)
{
int so;
int bufsiz_current, bufsiz_wanted;
int ret;
socklen_t len;
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.
*/
/* Try to have 128k. If we have more, do not lower it. */
bufsiz_wanted = 128 * 1024;
len = sizeof(bufsiz_current);
ret = getsockopt(so, SOL_SOCKET, SO_SNDBUF,
&bufsiz_current, &len);
if ((ret < 0) || (bufsiz_current < bufsiz_wanted))
(void)setsockopt(so, SOL_SOCKET, SO_SNDBUF,
&bufsiz_wanted, sizeof(bufsiz_wanted));
/* Try to have have at least 2MB. If we have more, do not lower it. */
bufsiz_wanted = 2 * 1024 * 1024;
len = sizeof(bufsiz_current);
ret = getsockopt(so, SOL_SOCKET, SO_RCVBUF,
&bufsiz_current, &len);
if (ret < 0)
bufsiz_current = 128 * 1024;
for (; bufsiz_wanted > bufsiz_current; bufsiz_wanted /= 2) {
if (setsockopt(so, SOL_SOCKET, SO_RCVBUF,
&bufsiz_wanted, sizeof(bufsiz_wanted)) == 0)
break;
}
__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 occurred.
* others : a pointer to sadb_msg structure.
*
* XXX should be rewritten to pass length explicitly
*/
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 *)) == NULL) {
__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;
}
/* don't trust what the kernel says, validate! */
if (PFKEY_UNUNIT64(newmsg->sadb_msg_len) != len) {
__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.
*
* XXX should be rewritten to obtain length explicitly
*/
int
pfkey_align(msg, mhp)
struct sadb_msg *msg;
caddr_t *mhp;
{
struct sadb_ext *ext;
int i;
caddr_t p;
caddr_t ep; /* XXX should be passed from upper layer */
/* 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;
/* initialize */
p = (caddr_t) msg;
ep = p + PFKEY_UNUNIT64(msg->sadb_msg_len);
/* skip base header */
p += sizeof(struct sadb_msg);
while (p < ep) {
ext = (struct sadb_ext *)p;
if (ep < p + sizeof(*ext) || PFKEY_EXTLEN(ext) < sizeof(*ext) ||
ep < p + PFKEY_EXTLEN(ext)) {
/* invalid format */
break;
}
/* 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:
case SADB_X_EXT_SA2:
case SADB_X_EXT_NAT_T_TYPE:
case SADB_X_EXT_NAT_T_SPORT:
case SADB_X_EXT_NAT_T_DPORT:
case SADB_X_EXT_NAT_T_OAI:
case SADB_X_EXT_NAT_T_OAR:
case SADB_X_EXT_NAT_T_FRAG:
case SADB_X_EXT_SA_REPLAY:
case SADB_X_EXT_NEW_ADDRESS_SRC:
case SADB_X_EXT_NEW_ADDRESS_DST:
mhp[ext->sadb_ext_type] = (caddr_t)ext;
break;
default:
__ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
return -1;
}
p += PFKEY_EXTLEN(ext);
}
if (p != ep) {
__ipsec_errcode = EIPSEC_INVAL_SADBMSG;
return -1;
}
__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:
case SADB_X_SATYPE_TCPSIGNATURE:
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, lim, type, tlen, satype, seq, pid)
caddr_t buf;
caddr_t lim;
u_int type, satype;
u_int tlen;
u_int32_t seq;
pid_t pid;
{
struct sadb_msg *p;
u_int len;
p = (struct sadb_msg *)buf;
len = sizeof(struct sadb_msg);
if (buf + len > lim)
return NULL;
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_reserved = 0;
p->sadb_msg_seq = seq;
p->sadb_msg_pid = (u_int32_t)pid;
return(buf + len);
}
/*
* copy secasvar data into sadb_address.
* `buf' must has been allocated sufficiently.
*/
static caddr_t
pfkey_setsadbsa(buf, lim, spi, wsize, auth, enc, flags)
caddr_t buf;
caddr_t lim;
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);
if (buf + len > lim)
return NULL;
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 > UINT8_MAX ? UINT8_MAX: 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_x_sa_replay.
* `buf' must has been allocated sufficiently.
*/
static caddr_t
pfkey_setsadbxreplay(caddr_t buf, caddr_t lim, uint32_t wsize)
{
struct sadb_x_sa_replay *p;
u_int len;
p = (struct sadb_x_sa_replay *)buf;
len = sizeof(struct sadb_x_sa_replay);
if (buf + len > lim)
return (NULL);
memset(p, 0, len);
p->sadb_x_sa_replay_len = PFKEY_UNIT64(len);
p->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY;
/* Convert wsize from bytes to number of packets. */
p->sadb_x_sa_replay_replay = wsize << 3;
return (buf + len);
}
/*
* set data into sadb_address.
* `buf' must has been allocated sufficiently.
* prefixlen is in bits.
*/
static caddr_t
pfkey_setsadbaddr(buf, lim, exttype, saddr, prefixlen, ul_proto)
caddr_t buf;
caddr_t lim;
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);
if (buf + len > lim)
return NULL;
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, lim, type, key, keylen)
caddr_t buf;
caddr_t lim;
caddr_t 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);
if (buf + len > lim)
return NULL;
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, lim, type, l_alloc, l_bytes, l_addtime, l_usetime)
caddr_t buf;
caddr_t lim;
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);
if (buf + len > lim)
return NULL;
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;
}
/*
* copy secasvar data into sadb_address.
* `buf' must has been allocated sufficiently.
*/
static caddr_t
pfkey_setsadbxsa2(buf, lim, mode0, reqid)
caddr_t buf;
caddr_t lim;
u_int32_t mode0;
u_int32_t reqid;
{
struct sadb_x_sa2 *p;
u_int8_t mode = mode0 & 0xff;
u_int len;
p = (struct sadb_x_sa2 *)buf;
len = sizeof(struct sadb_x_sa2);
if (buf + len > lim)
return NULL;
memset(p, 0, len);
p->sadb_x_sa2_len = PFKEY_UNIT64(len);
p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
p->sadb_x_sa2_mode = mode;
p->sadb_x_sa2_reqid = reqid;
return(buf + len);
}
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