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#pragma once
/***
This file is part of systemd.
Copyright (C) 2015 Tom Gundersen <teg@jklmen>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "sd-id128.h"
#include "macro.h"
#include "sparse-endian.h"
#include "unaligned.h"
typedef enum DHCPDUIDType {
DHCP_DUID_TYPE_RAW = 0,
DHCP_DUID_TYPE_LLT = 1,
DHCP_DUID_TYPE_EN = 2,
DHCP_DUID_TYPE_LL = 3,
DHCP_DUID_TYPE_UUID = 4,
_DHCP_DUID_TYPE_MAX,
_DHCP_DUID_TYPE_INVALID = -1,
} DHCPDUIDType;
/* RFC 3315 section 9.1:
* A DUID can be no more than 128 octets long (not including the type code).
*/
#define MAX_DUID_LEN 128
struct duid {
be16_t type;
union {
struct {
/* DHCP6_DUID_LLT */
uint16_t htype;
uint32_t time;
uint8_t haddr[0];
} _packed_ llt;
struct {
/* DHCP6_DUID_EN */
uint32_t pen;
uint8_t id[8];
} _packed_ en;
struct {
/* DHCP6_DUID_LL */
int16_t htype;
uint8_t haddr[0];
} _packed_ ll;
struct {
/* DHCP6_DUID_UUID */
sd_id128_t uuid;
} _packed_ uuid;
struct {
uint8_t data[MAX_DUID_LEN];
} _packed_ raw;
};
} _packed_;
int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len);
int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id);
static inline int dhcp_validate_duid_len(be16_t duid_type, size_t duid_len) {
struct duid d;
assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL);
switch (be16toh(duid_type)) {
case DHCP_DUID_TYPE_LLT:
if (duid_len <= sizeof(d.llt))
return -EINVAL;
break;
case DHCP_DUID_TYPE_EN:
if (duid_len != sizeof(d.en))
return -EINVAL;
break;
case DHCP_DUID_TYPE_LL:
if (duid_len <= sizeof(d.ll))
return -EINVAL;
break;
case DHCP_DUID_TYPE_UUID:
if (duid_len != sizeof(d.uuid))
return -EINVAL;
break;
default:
/* accept unknown type in order to be forward compatible */
break;
}
return 0;
}
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