src/libsystemd-dhcp/dhcp-protocol.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright (C) 2013 Intel Corporation. All rights reserved.
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <netinet/udp.h>
  25 #include <netinet/ip.h>
  26 #include <stdint.h>
  27
  28 #include "macro.h"
  29 #include "sparse-endian.h"
  30
  31 struct DHCPMessage {
  32         uint8_t op;
  33         uint8_t htype;
  34         uint8_t hlen;
  35         uint8_t hops;
  36         be32_t xid;
  37         be16_t secs;
  38         be16_t flags;
  39         be32_t ciaddr;
  40         be32_t yiaddr;
  41         be32_t siaddr;
  42         be32_t giaddr;
  43         uint8_t chaddr[16];
  44         uint8_t sname[64];
  45         uint8_t file[128];
  46 } _packed_;
  47
  48 typedef struct DHCPMessage DHCPMessage;
  49
  50 struct DHCPPacket {
  51         struct iphdr ip;
  52         struct udphdr udp;
  53         DHCPMessage dhcp;
  54 } _packed_;
  55
  56 typedef struct DHCPPacket DHCPPacket;
  57
  58 #define DHCP_IP_SIZE            (int32_t)(sizeof(struct iphdr))
  59 #define DHCP_IP_UDP_SIZE        (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE)
  60 #define DHCP_MESSAGE_SIZE       (int32_t)(sizeof(DHCPMessage))
  61 #define DHCP_MIN_OPTIONS_SIZE   312
  62
  63 enum {
  64         DHCP_PORT_SERVER                        = 67,
  65         DHCP_PORT_CLIENT                        = 68,
  66 };
  67
  68 enum DHCPState {
  69         DHCP_STATE_INIT                         = 0,
  70         DHCP_STATE_SELECTING                    = 1,
  71         DHCP_STATE_INIT_REBOOT                  = 2,
  72         DHCP_STATE_REBOOTING                    = 3,
  73         DHCP_STATE_REQUESTING                   = 4,
  74         DHCP_STATE_BOUND                        = 5,
  75         DHCP_STATE_RENEWING                     = 6,
  76         DHCP_STATE_REBINDING                    = 7,
  77 };
  78
  79 typedef enum DHCPState DHCPState;
  80
  81 enum {
  82         BOOTREQUEST                             = 1,
  83         BOOTREPLY                               = 2,
  84 };
  85
  86 enum {
  87         DHCP_DISCOVER                           = 1,
  88         DHCP_OFFER                              = 2,
  89         DHCP_REQUEST                            = 3,
  90         DHCP_DECLINE                            = 4,
  91         DHCP_ACK                                = 5,
  92         DHCP_NAK                                = 6,
  93         DHCP_RELEASE                            = 7,
  94 };
  95
  96 enum {
  97         DHCP_OVERLOAD_FILE                      = 1,
  98         DHCP_OVERLOAD_SNAME                     = 2,
  99 };
 100
 101 enum {
 102         DHCP_OPTION_PAD                         = 0,
 103         DHCP_OPTION_SUBNET_MASK                 = 1,
 104         DHCP_OPTION_ROUTER                      = 3,
 105         DHCP_OPTION_DOMAIN_NAME_SERVER          = 6,
 106         DHCP_OPTION_HOST_NAME                   = 12,
 107         DHCP_OPTION_DOMAIN_NAME                 = 15,
 108         DHCP_OPTION_INTERFACE_MTU               = 26,
 109         DHCP_OPTION_NTP_SERVER                  = 42,
 110         DHCP_OPTION_REQUESTED_IP_ADDRESS        = 50,
 111         DHCP_OPTION_IP_ADDRESS_LEASE_TIME       = 51,
 112         DHCP_OPTION_OVERLOAD                    = 52,
 113         DHCP_OPTION_MESSAGE_TYPE                = 53,
 114         DHCP_OPTION_SERVER_IDENTIFIER           = 54,
 115         DHCP_OPTION_PARAMETER_REQUEST_LIST      = 55,
 116         DHCP_OPTION_MAXIMUM_MESSAGE_SIZE        = 57,
 117         DHCP_OPTION_RENEWAL_T1_TIME             = 58,
 118         DHCP_OPTION_REBINDING_T2_TIME           = 59,
 119         DHCP_OPTION_CLIENT_IDENTIFIER           = 61,
 120         DHCP_OPTION_END                         = 255,
 121 };