src/libsystemd-network/dhcp-identifier.h

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