103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright (C) 2015 Tom Gundersen <teg@jklmen>
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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 "sd-id128.h"
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#include "macro.h"
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#include "sparse-endian.h"
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#include "unaligned.h"
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typedef enum DUIDType {
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DUID_TYPE_RAW = 0,
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DUID_TYPE_LLT = 1,
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DUID_TYPE_EN = 2,
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DUID_TYPE_LL = 3,
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DUID_TYPE_UUID = 4,
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_DUID_TYPE_MAX,
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_DUID_TYPE_INVALID = -1,
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} DUIDType;
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/* RFC 3315 section 9.1:
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* A DUID can be no more than 128 octets long (not including the type code).
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*/
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#define MAX_DUID_LEN 128
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struct duid {
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be16_t type;
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union {
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struct {
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/* DHCP6_DUID_LLT */
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uint16_t htype;
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uint32_t time;
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uint8_t haddr[0];
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} _packed_ llt;
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struct {
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/* DHCP6_DUID_EN */
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uint32_t pen;
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uint8_t id[8];
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} _packed_ en;
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struct {
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/* DHCP6_DUID_LL */
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int16_t htype;
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uint8_t haddr[0];
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} _packed_ ll;
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struct {
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/* DHCP6_DUID_UUID */
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sd_id128_t uuid;
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} _packed_ uuid;
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struct {
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uint8_t data[MAX_DUID_LEN];
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} _packed_ raw;
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};
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} _packed_;
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int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len);
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int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id);
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static inline int dhcp_validate_duid_len(uint16_t duid_type, size_t duid_len) {
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struct duid d;
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assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL);
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switch (duid_type) {
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case DUID_TYPE_LLT:
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if (duid_len <= sizeof(d.llt))
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return -EINVAL;
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break;
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case DUID_TYPE_EN:
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if (duid_len != sizeof(d.en))
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return -EINVAL;
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break;
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case DUID_TYPE_LL:
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if (duid_len <= sizeof(d.ll))
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return -EINVAL;
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break;
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case DUID_TYPE_UUID:
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if (duid_len != sizeof(d.uuid))
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return -EINVAL;
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break;
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default:
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/* accept unknown type in order to be forward compatible */
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break;
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}
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return 0;
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}
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