src/libsystemd-network/dhcp-protocol.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright (C) 2013 Intel Corporation. All rights reserved.
   8 ***/
   9
  10 #include <netinet/ip.h>
  11 #include <netinet/udp.h>
  12 #include <stdint.h>
  13
  14 #include "macro.h"
  15 #include "sparse-endian.h"
  16
  17 struct DHCPMessage {
  18         uint8_t op;
  19         uint8_t htype;
  20         uint8_t hlen;
  21         uint8_t hops;
  22         be32_t xid;
  23         be16_t secs;
  24         be16_t flags;
  25         be32_t ciaddr;
  26         be32_t yiaddr;
  27         be32_t siaddr;
  28         be32_t giaddr;
  29         uint8_t chaddr[16];
  30         uint8_t sname[64];
  31         uint8_t file[128];
  32         be32_t magic;
  33         uint8_t options[0];
  34 } _packed_;
  35
  36 typedef struct DHCPMessage DHCPMessage;
  37
  38 struct DHCPPacket {
  39         struct iphdr ip;
  40         struct udphdr udp;
  41         DHCPMessage dhcp;
  42 } _packed_;
  43
  44 typedef struct DHCPPacket DHCPPacket;
  45
  46 #define DHCP_IP_SIZE            (int32_t)(sizeof(struct iphdr))
  47 #define DHCP_IP_UDP_SIZE        (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE)
  48 #define DHCP_MESSAGE_SIZE       (int32_t)(sizeof(DHCPMessage))
  49 #define DHCP_DEFAULT_MIN_SIZE   576 /* the minimum internet hosts must be able to receive */
  50 #define DHCP_MIN_OPTIONS_SIZE   (DHCP_DEFAULT_MIN_SIZE - DHCP_IP_UDP_SIZE - DHCP_MESSAGE_SIZE)
  51 #define DHCP_MAGIC_COOKIE       (uint32_t)(0x63825363)
  52
  53 enum {
  54         DHCP_PORT_SERVER                        = 67,
  55         DHCP_PORT_CLIENT                        = 68,
  56 };
  57
  58 enum DHCPState {
  59         DHCP_STATE_INIT                         = 0,
  60         DHCP_STATE_SELECTING                    = 1,
  61         DHCP_STATE_INIT_REBOOT                  = 2,
  62         DHCP_STATE_REBOOTING                    = 3,
  63         DHCP_STATE_REQUESTING                   = 4,
  64         DHCP_STATE_BOUND                        = 5,
  65         DHCP_STATE_RENEWING                     = 6,
  66         DHCP_STATE_REBINDING                    = 7,
  67         DHCP_STATE_STOPPED                      = 8,
  68 };
  69
  70 typedef enum DHCPState DHCPState;
  71
  72 enum {
  73         BOOTREQUEST                             = 1,
  74         BOOTREPLY                               = 2,
  75 };
  76
  77 enum {
  78         DHCP_DISCOVER                           = 1,
  79         DHCP_OFFER                              = 2,
  80         DHCP_REQUEST                            = 3,
  81         DHCP_DECLINE                            = 4,
  82         DHCP_ACK                                = 5,
  83         DHCP_NAK                                = 6,
  84         DHCP_RELEASE                            = 7,
  85         DHCP_INFORM                             = 8,
  86         DHCP_FORCERENEW                         = 9,
  87 };
  88
  89 enum {
  90         DHCP_OVERLOAD_FILE                      = 1,
  91         DHCP_OVERLOAD_SNAME                     = 2,
  92 };
  93
  94 #define DHCP_MAX_FQDN_LENGTH 255
  95
  96 enum {
  97         DHCP_FQDN_FLAG_S = (1 << 0),
  98         DHCP_FQDN_FLAG_O = (1 << 1),
  99         DHCP_FQDN_FLAG_E = (1 << 2),
 100         DHCP_FQDN_FLAG_N = (1 << 3),
 101 };