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Diffstat (limited to 'lib/libipsec/pfkey.c')
| -rw-r--r-- | lib/libipsec/pfkey.c | 2199 |
1 files changed, 2199 insertions, 0 deletions
diff --git a/lib/libipsec/pfkey.c b/lib/libipsec/pfkey.c new file mode 100644 index 0000000000000..d1aae7321c2ef --- /dev/null +++ b/lib/libipsec/pfkey.c @@ -0,0 +1,2199 @@ +/* $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 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; + 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 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_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 occured, 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 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, 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 occured, 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 occured, 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 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. + * 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; + 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 occured, 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 occured, 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 occured, 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 occured, 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 occured, 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 occured, 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 occured, 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 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; + 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 occured. + * 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); +} |