src/libsystemd-network/dhcp-protocol.h

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