src/libsystemd-network/dhcp6-option.c

84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering/***
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  This file is part of systemd.
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  Copyright (C) 2014-2015 Intel Corporation. All rights reserved.
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  systemd is free software; you can redistribute it and/or modify it
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  under the terms of the GNU Lesser General Public License as published by
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  the Free Software Foundation; either version 2.1 of the License, or
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  (at your option) any later version.
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  systemd is distributed in the hope that it will be useful, but
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  WITHOUT ANY WARRANTY; without even the implied warranty of
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  Lesser General Public License for more details.
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  You should have received a copy of the GNU Lesser General Public License
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering  along with systemd; If not, see <http://www.gnu.org/licenses/>.
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering***/
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include <errno.h>
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include <netinet/in.h>
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include <string.h>
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include "sd-dhcp6-client.h"
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include "alloc-util.h"
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include "dhcp6-internal.h"
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include "dhcp6-protocol.h"
b5efdb8af40ea759a1ea584c1bc44ecc81dd00ceLennart Poettering#include "dns-domain.h"
4f5dd3943bef8a04be7e3b838b822bb9a7ad6cb3Lennart Poettering#include "sparse-endian.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering#include "strv.h"
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include "unaligned.h"
11c3a36649e5e5e77db499c92f3cdcbd619efd3aThomas Hindoe Paaboel Andersen#include "util.h"
b11d6a7bed4d867fb9f6ff4e7eb4ab20fcdc9301Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering#define DHCP6_OPTION_IA_NA_LEN                  12
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering#define DHCP6_OPTION_IA_TA_LEN                  4
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poetteringtypedef struct DHCP6Option {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        be16_t code;
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger        be16_t len;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        uint8_t data[];
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering} _packed_ DHCP6Option;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poetteringstatic int option_append_hdr(uint8_t **buf, size_t *buflen, uint16_t optcode,
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                             size_t optlen) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        DHCP6Option *option = (DHCP6Option*) *buf;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(buf, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(*buf, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(buflen, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
93de9eb76d628cf731120d97332e03600c167271Filipe Brandenburger        if (optlen > 0xffff || *buflen < optlen + sizeof(DHCP6Option))
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                return -ENOBUFS;
8372da448f3c738e0154d988538d497f7e2e1f83Filipe Brandenburger
8372da448f3c738e0154d988538d497f7e2e1f83Filipe Brandenburger        option->code = htobe16(optcode);
8372da448f3c738e0154d988538d497f7e2e1f83Filipe Brandenburger        option->len = htobe16(optlen);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buf += sizeof(DHCP6Option);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buflen -= sizeof(DHCP6Option);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        return 0;
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger}
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburgerint dhcp6_option_append(uint8_t **buf, size_t *buflen, uint16_t code,
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        size_t optlen, const void *optval) {
93de9eb76d628cf731120d97332e03600c167271Filipe Brandenburger        int r;
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger        assert_return(optval || optlen == 0, -EINVAL);
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger
93de9eb76d628cf731120d97332e03600c167271Filipe Brandenburger        r = option_append_hdr(buf, buflen, code, optlen);
93de9eb76d628cf731120d97332e03600c167271Filipe Brandenburger        if (r < 0)
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger                return r;
93de9eb76d628cf731120d97332e03600c167271Filipe Brandenburger
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger        if (optval)
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                memcpy(*buf, optval, optlen);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buf += optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buflen -= optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger        return 0;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering}
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburger
b85e1c2534ca3b396c2aaa7de384995b42d12e1bFilipe Brandenburgerint dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, DHCP6IA *ia) {
93de9eb76d628cf731120d97332e03600c167271Filipe Brandenburger        uint16_t len;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        uint8_t *ia_hdr;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        size_t ia_buflen, ia_addrlen = 0;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        DHCP6Address *addr;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        int r;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(buf && *buf && buflen && ia, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        switch (ia->type) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        case SD_DHCP6_OPTION_IA_NA:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                len = DHCP6_OPTION_IA_NA_LEN;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                break;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        case SD_DHCP6_OPTION_IA_TA:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                len = DHCP6_OPTION_IA_TA_LEN;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                break;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        default:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                return -EINVAL;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        if (*buflen < len)
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                return -ENOBUFS;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
3565e09594a9cd2786b5682ad13812491e6781c1Zbigniew Jędrzejewski-Szmek        ia_hdr = *buf;
c932fb71cc90461b88ecdffe47c071d001d78fb4Shawn Landden        ia_buflen = *buflen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
3565e09594a9cd2786b5682ad13812491e6781c1Zbigniew Jędrzejewski-Szmek        *buf += sizeof(DHCP6Option);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buflen -= sizeof(DHCP6Option);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        memcpy(*buf, &ia->id, len);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
3ff13c298d6d53293680c383768c3054fb9fcc30Filipe Brandenburger        *buf += len;
3ff13c298d6d53293680c383768c3054fb9fcc30Filipe Brandenburger        *buflen -= len;
3ff13c298d6d53293680c383768c3054fb9fcc30Filipe Brandenburger
3ff13c298d6d53293680c383768c3054fb9fcc30Filipe Brandenburger        LIST_FOREACH(addresses, addr, ia->addresses) {
3ff13c298d6d53293680c383768c3054fb9fcc30Filipe Brandenburger                r = option_append_hdr(buf, buflen, SD_DHCP6_OPTION_IAADDR,
3565e09594a9cd2786b5682ad13812491e6781c1Zbigniew Jędrzejewski-Szmek                                      sizeof(addr->iaaddr));
3565e09594a9cd2786b5682ad13812491e6781c1Zbigniew Jędrzejewski-Szmek                if (r < 0)
3ff13c298d6d53293680c383768c3054fb9fcc30Filipe Brandenburger                        return r;
3565e09594a9cd2786b5682ad13812491e6781c1Zbigniew Jędrzejewski-Szmek
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                memcpy(*buf, &addr->iaaddr, sizeof(addr->iaaddr));
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                *buf += sizeof(addr->iaaddr);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                *buflen -= sizeof(addr->iaaddr);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                ia_addrlen += sizeof(DHCP6Option) + sizeof(addr->iaaddr);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        }
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        r = option_append_hdr(&ia_hdr, &ia_buflen, ia->type, len + ia_addrlen);
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        if (r < 0)
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger                return r;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        return 0;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger}
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
c89f52ac6938374972253d8752ed65f3af0b3ef4Lennart Poettering
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburgerstatic int option_parse_hdr(uint8_t **buf, size_t *buflen, uint16_t *optcode, size_t *optlen) {
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        DHCP6Option *option = (DHCP6Option*) *buf;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        uint16_t len;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        assert_return(buf, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(optcode, -EINVAL);
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        assert_return(optlen, -EINVAL);
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        if (*buflen < sizeof(DHCP6Option))
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                return -ENOMSG;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        len = be16toh(option->len);
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        if (len > *buflen)
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger                return -ENOMSG;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        *optcode = be16toh(option->code);
c89f52ac6938374972253d8752ed65f3af0b3ef4Lennart Poettering        *optlen = len;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        *buf += 4;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        *buflen -= 4;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        return 0;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger}
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburgerint dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode,
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger                       size_t *optlen, uint8_t **optvalue) {
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger        int r;
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger        assert_return(buf && buflen && optcode && optlen && optvalue, -EINVAL);
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger        r = option_parse_hdr(buf, buflen, optcode, optlen);
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger        if (r < 0)
0247447e96f1385cf0c48e3e6b696214fbe36802Filipe Brandenburger                return r;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        if (*optlen > *buflen)
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger                return -ENOBUFS;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        *optvalue = *buf;
27fc921b658adc5baa988c4c213888b016a60b18Filipe Brandenburger        *buflen -= *optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buf += *optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        return 0;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering}
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poetteringint dhcp6_option_parse_ia(uint8_t **buf, size_t *buflen, uint16_t iatype,
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                          DHCP6IA *ia) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        int r;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        uint16_t opt, status;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        size_t optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        size_t iaaddr_offset;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        DHCP6Address *addr;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        uint32_t lt_t1, lt_t2, lt_valid, lt_pref, lt_min = ~0;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(ia, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        assert_return(!ia->addresses, -EINVAL);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        switch (iatype) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        case SD_DHCP6_OPTION_IA_NA:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                if (*buflen < DHCP6_OPTION_IA_NA_LEN + sizeof(DHCP6Option) +
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                    sizeof(addr->iaaddr)) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        r = -ENOBUFS;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        goto error;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                iaaddr_offset = DHCP6_OPTION_IA_NA_LEN;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                memcpy(&ia->id, *buf, iaaddr_offset);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                lt_t1 = be32toh(ia->lifetime_t1);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                lt_t2 = be32toh(ia->lifetime_t2);
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                if (lt_t1 && lt_t2 && lt_t1 > lt_t2) {
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                        log_dhcp6_client(client, "IA T1 %ds > T2 %ds",
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                                         lt_t1, lt_t2);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        r = -EINVAL;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        goto error;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                break;
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering        case SD_DHCP6_OPTION_IA_TA:
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                if (*buflen < DHCP6_OPTION_IA_TA_LEN + sizeof(DHCP6Option) +
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                    sizeof(addr->iaaddr)) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        r = -ENOBUFS;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        goto error;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                iaaddr_offset = DHCP6_OPTION_IA_TA_LEN;
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                memcpy(&ia->id, *buf, iaaddr_offset);
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                ia->lifetime_t1 = 0;
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                ia->lifetime_t2 = 0;
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering                break;
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering        default:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                r = -ENOMSG;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                goto error;
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering        }
dea7b6b043f0cd9e34ee719b9b612c3a4776387eLennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        ia->type = iatype;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buflen -= iaaddr_offset;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        *buf += iaaddr_offset;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        while ((r = option_parse_hdr(buf, buflen, &opt, &optlen)) >= 0) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                switch (opt) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                case SD_DHCP6_OPTION_IAADDR:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        addr = new0(DHCP6Address, 1);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        if (!addr) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                r = -ENOMEM;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                goto error;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        LIST_INIT(addresses, addr);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        memcpy(&addr->iaaddr, *buf, sizeof(addr->iaaddr));
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        lt_valid = be32toh(addr->iaaddr.lifetime_valid);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        lt_pref = be32toh(addr->iaaddr.lifetime_valid);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        if (!lt_valid || lt_pref > lt_valid) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                log_dhcp6_client(client, "IA preferred %ds > valid %ds",
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                                 lt_pref, lt_valid);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                free(addr);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        } else {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                LIST_PREPEND(addresses, ia->addresses, addr);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                if (lt_valid < lt_min)
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                        lt_min = lt_valid;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        break;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                case SD_DHCP6_OPTION_STATUS_CODE:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        if (optlen < sizeof(status))
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                break;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        status = (*buf)[0] << 8 | (*buf)[1];
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        if (status) {
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                log_dhcp6_client(client, "IA status %d",
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                                 status);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                r = -EINVAL;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                                goto error;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        break;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                default:
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        log_dhcp6_client(client, "Unknown IA option %d", opt);
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                        break;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                }
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                *buflen -= optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering                *buf += optlen;
84ac7bea360cd369df26910e9685a7eed2327088Lennart Poettering        }

        if (r == -ENOMSG)
                r = 0;

        if (!ia->lifetime_t1 && !ia->lifetime_t2) {
                lt_t1 = lt_min / 2;
                lt_t2 = lt_min / 10 * 8;
                ia->lifetime_t1 = htobe32(lt_t1);
                ia->lifetime_t2 = htobe32(lt_t2);

                log_dhcp6_client(client, "Computed IA T1 %ds and T2 %ds as both were zero",
                                 lt_t1, lt_t2);
        }

        if (*buflen)
                r = -ENOMSG;

error:
        *buf += *buflen;
        *buflen = 0;

        return r;
}

int dhcp6_option_parse_ip6addrs(uint8_t *optval, uint16_t optlen,
                                struct in6_addr **addrs, size_t count,
                                size_t *allocated) {

        if (optlen == 0 || optlen % sizeof(struct in6_addr) != 0)
                return -EINVAL;

        if (!GREEDY_REALLOC(*addrs, *allocated,
                            count * sizeof(struct in6_addr) + optlen))
                return -ENOMEM;

        memcpy(*addrs + count, optval, optlen);

        count += optlen / sizeof(struct in6_addr);

        return count;
}

int dhcp6_option_parse_domainname(const uint8_t *optval, uint16_t optlen, char ***str_arr) {
        size_t pos = 0, idx = 0;
        _cleanup_free_ char **names = NULL;
        int r;

        assert_return(optlen > 1, -ENODATA);
        assert_return(optval[optlen - 1] == '\0', -EINVAL);

        while (pos < optlen) {
                _cleanup_free_ char *ret = NULL;
                size_t n = 0, allocated = 0;
                bool first = true;

                for (;;) {
                        uint8_t c;

                        c = optval[pos++];

                        if (c == 0)
                                /* End of name */
                                break;
                        else if (c <= 63) {
                                const char *label;

                                /* Literal label */
                                label = (const char *)&optval[pos];
                                pos += c;
                                if (pos > optlen)
                                        return -EMSGSIZE;

                                if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                if (first)
                                        first = false;
                                else
                                        ret[n++] = '.';

                                r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX);
                                if (r < 0)
                                        goto fail;

                                n += r;
                                continue;
                        } else {
                                r = -EBADMSG;
                                goto fail;
                        }
                }

                if (!GREEDY_REALLOC(ret, allocated, n + 1)) {
                        r = -ENOMEM;
                        goto fail;
                }

                ret[n] = 0;

                r = strv_extend(&names, ret);
                if (r < 0)
                        goto fail;

                idx++;
        }

        *str_arr = names;
        names = NULL;

        return idx;

fail:
        return r;
}