src/libsystemd-network/dhcp-identifier.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   Copyright (C) 2015 Tom Gundersen <teg@jklmen>
   6 ***/
   7
   8 #include "sd-id128.h"
   9
  10 #include "macro.h"
  11 #include "sparse-endian.h"
  12 #include "unaligned.h"
  13
  14 typedef enum DUIDType {
  15         DUID_TYPE_LLT       = 1,
  16         DUID_TYPE_EN        = 2,
  17         DUID_TYPE_LL        = 3,
  18         DUID_TYPE_UUID      = 4,
  19         _DUID_TYPE_MAX,
  20         _DUID_TYPE_INVALID  = -1,
  21 } DUIDType;
  22
  23 /* RFC 3315 section 9.1:
  24  *      A DUID can be no more than 128 octets long (not including the type code).
  25  */
  26 #define MAX_DUID_LEN 128
  27
  28 /* https://tools.ietf.org/html/rfc3315#section-9.1 */
  29 struct duid {
  30         be16_t type;
  31         union {
  32                 struct {
  33                         /* DUID_TYPE_LLT */
  34                         uint16_t htype;
  35                         uint32_t time;
  36                         uint8_t haddr[0];
  37                 } _packed_ llt;
  38                 struct {
  39                         /* DUID_TYPE_EN */
  40                         uint32_t pen;
  41                         uint8_t id[8];
  42                 } _packed_ en;
  43                 struct {
  44                         /* DUID_TYPE_LL */
  45                         int16_t htype;
  46                         uint8_t haddr[0];
  47                 } _packed_ ll;
  48                 struct {
  49                         /* DUID_TYPE_UUID */
  50                         sd_id128_t uuid;
  51                 } _packed_ uuid;
  52                 struct {
  53                         uint8_t data[MAX_DUID_LEN];
  54                 } _packed_ raw;
  55         };
  56 } _packed_;
  57
  58 int dhcp_validate_duid_len(uint16_t duid_type, size_t duid_len);
  59 int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len);
  60 int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id);