ed6ee21953
Add a Rapid Commit option to Solicit messages and expect a Reply to be received instead of an Advertise. When receiving a DHCPv6 message from the server in state Solicit, continue testing whether the message is a Reply. Ease up the message type checking, it's not fatal if the message is of a wrong type. Add helper functions to set/get the rapid commit of a lease. See RFC 3315, sections 17., 17.1.2., 17.1.4. and 18.1.8.
315 lines
8.8 KiB
C
315 lines
8.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright (C) 2014 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/in.h>
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#include <errno.h>
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#include <string.h>
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#include "sparse-endian.h"
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#include "util.h"
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#include "dhcp6-internal.h"
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#include "dhcp6-protocol.h"
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#define DHCP6_OPTION_HDR_LEN 4
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#define DHCP6_OPTION_IA_NA_LEN 12
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#define DHCP6_OPTION_IA_TA_LEN 4
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#define DHCP6_OPTION_IAADDR_LEN 24
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static int option_append_hdr(uint8_t **buf, size_t *buflen, uint16_t optcode,
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size_t optlen) {
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assert_return(buf, -EINVAL);
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assert_return(*buf, -EINVAL);
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assert_return(buflen, -EINVAL);
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if (optlen > 0xffff || *buflen < optlen + DHCP6_OPTION_HDR_LEN)
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return -ENOBUFS;
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(*buf)[0] = optcode >> 8;
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(*buf)[1] = optcode & 0xff;
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(*buf)[2] = optlen >> 8;
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(*buf)[3] = optlen & 0xff;
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*buf += DHCP6_OPTION_HDR_LEN;
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*buflen -= DHCP6_OPTION_HDR_LEN;
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return 0;
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}
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int dhcp6_option_append(uint8_t **buf, size_t *buflen, uint16_t code,
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size_t optlen, const void *optval) {
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int r;
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assert_return(optval || optlen == 0, -EINVAL);
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r = option_append_hdr(buf, buflen, code, optlen);
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if (r < 0)
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return r;
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if (optval)
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memcpy(*buf, optval, optlen);
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*buf += optlen;
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*buflen -= optlen;
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return 0;
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}
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int dhcp6_option_append_ia(uint8_t **buf, size_t *buflen, DHCP6IA *ia) {
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uint16_t len;
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uint8_t *ia_hdr;
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size_t ia_buflen, ia_addrlen = 0;
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DHCP6Address *addr;
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int r;
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assert_return(buf && *buf && buflen && ia, -EINVAL);
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switch (ia->type) {
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case DHCP6_OPTION_IA_NA:
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len = DHCP6_OPTION_IA_NA_LEN;
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break;
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case DHCP6_OPTION_IA_TA:
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len = DHCP6_OPTION_IA_TA_LEN;
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break;
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default:
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return -EINVAL;
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}
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if (*buflen < len)
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return -ENOBUFS;
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ia_hdr = *buf;
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ia_buflen = *buflen;
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*buf += DHCP6_OPTION_HDR_LEN;
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*buflen -= DHCP6_OPTION_HDR_LEN;
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memcpy(*buf, &ia->id, len);
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*buf += len;
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*buflen -= len;
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LIST_FOREACH(addresses, addr, ia->addresses) {
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r = option_append_hdr(buf, buflen, DHCP6_OPTION_IAADDR,
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DHCP6_OPTION_IAADDR_LEN);
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if (r < 0)
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return r;
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memcpy(*buf, &addr->address, DHCP6_OPTION_IAADDR_LEN);
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*buf += DHCP6_OPTION_IAADDR_LEN;
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*buflen -= DHCP6_OPTION_IAADDR_LEN;
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ia_addrlen += DHCP6_OPTION_HDR_LEN + DHCP6_OPTION_IAADDR_LEN;
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}
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r = option_append_hdr(&ia_hdr, &ia_buflen, ia->type, len + ia_addrlen);
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if (r < 0)
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return r;
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return 0;
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}
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static int option_parse_hdr(uint8_t **buf, size_t *buflen, uint16_t *opt,
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size_t *optlen) {
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uint16_t len;
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assert_return(buf, -EINVAL);
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assert_return(opt, -EINVAL);
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assert_return(optlen, -EINVAL);
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if (*buflen < 4)
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return -ENOMSG;
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len = (*buf)[2] << 8 | (*buf)[3];
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if (len > *buflen)
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return -ENOMSG;
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*opt = (*buf)[0] << 8 | (*buf)[1];
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*optlen = len;
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*buf += 4;
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*buflen -= 4;
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return 0;
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}
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int dhcp6_option_parse(uint8_t **buf, size_t *buflen, uint16_t *optcode,
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size_t *optlen, uint8_t **optvalue) {
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int r;
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assert_return(buf && buflen && optcode && optlen && optvalue, -EINVAL);
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r = option_parse_hdr(buf, buflen, optcode, optlen);
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if (r < 0)
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return r;
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if (*optlen > *buflen)
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return -ENOBUFS;
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*optvalue = *buf;
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*buflen -= *optlen;
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*buf += *optlen;
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return 0;
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}
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int dhcp6_option_parse_ia(uint8_t **buf, size_t *buflen, uint16_t iatype,
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DHCP6IA *ia) {
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int r;
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uint16_t opt, status;
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size_t optlen;
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size_t iaaddr_offset;
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DHCP6Address *addr;
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uint32_t lt_t1, lt_t2, lt_valid, lt_pref, lt_min = ~0;
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assert_return(ia, -EINVAL);
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assert_return(!ia->addresses, -EINVAL);
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switch (iatype) {
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case DHCP6_OPTION_IA_NA:
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if (*buflen < DHCP6_OPTION_IA_NA_LEN + DHCP6_OPTION_HDR_LEN +
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DHCP6_OPTION_IAADDR_LEN) {
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r = -ENOBUFS;
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goto error;
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}
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iaaddr_offset = DHCP6_OPTION_IA_NA_LEN;
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memcpy(&ia->id, *buf, iaaddr_offset);
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lt_t1 = be32toh(ia->lifetime_t1);
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lt_t2 = be32toh(ia->lifetime_t2);
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if (lt_t1 && lt_t2 && lt_t1 > lt_t2) {
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log_dhcp6_client(client, "IA T1 %ds > T2 %ds",
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lt_t1, lt_t2);
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r = -EINVAL;
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goto error;
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}
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break;
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case DHCP6_OPTION_IA_TA:
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if (*buflen < DHCP6_OPTION_IA_TA_LEN + DHCP6_OPTION_HDR_LEN +
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DHCP6_OPTION_IAADDR_LEN) {
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r = -ENOBUFS;
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goto error;
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}
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iaaddr_offset = DHCP6_OPTION_IA_TA_LEN;
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memcpy(&ia->id, *buf, iaaddr_offset);
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ia->lifetime_t1 = 0;
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ia->lifetime_t2 = 0;
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break;
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default:
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r = -ENOMSG;
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goto error;
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}
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ia->type = iatype;
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*buflen -= iaaddr_offset;
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*buf += iaaddr_offset;
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while ((r = option_parse_hdr(buf, buflen, &opt, &optlen)) >= 0) {
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switch (opt) {
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case DHCP6_OPTION_IAADDR:
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addr = new0(DHCP6Address, 1);
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if (!addr) {
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r = -ENOMEM;
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goto error;
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}
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LIST_INIT(addresses, addr);
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memcpy(&addr->address, *buf, DHCP6_OPTION_IAADDR_LEN);
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lt_valid = be32toh(addr->lifetime_valid);
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lt_pref = be32toh(addr->lifetime_valid);
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if (!lt_valid || lt_pref > lt_valid) {
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log_dhcp6_client(client, "IA preferred %ds > valid %ds",
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lt_pref, lt_valid);
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free(addr);
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} else {
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LIST_PREPEND(addresses, ia->addresses, addr);
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if (lt_valid < lt_min)
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lt_min = lt_valid;
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}
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break;
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case DHCP6_OPTION_STATUS_CODE:
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if (optlen < sizeof(status))
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break;
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status = (*buf)[0] << 8 | (*buf)[1];
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if (status) {
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log_dhcp6_client(client, "IA status %d",
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status);
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r = -EINVAL;
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goto error;
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}
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break;
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default:
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log_dhcp6_client(client, "Unknown IA option %d", opt);
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break;
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}
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*buflen -= optlen;
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*buf += optlen;
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}
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if (r == -ENOMSG)
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r = 0;
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if (!ia->lifetime_t1 && !ia->lifetime_t2) {
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lt_t1 = lt_min / 2;
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lt_t2 = lt_min / 10 * 8;
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ia->lifetime_t1 = htobe32(lt_t1);
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ia->lifetime_t2 = htobe32(lt_t2);
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log_dhcp6_client(client, "Computed IA T1 %ds and T2 %ds as both were zero",
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lt_t1, lt_t2);
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}
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if (*buflen)
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r = -ENOMSG;
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error:
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*buf += *buflen;
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*buflen = 0;
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return r;
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}
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