src/libsystemd-network/dhcp-identifier.h

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