src/libsystemd-network/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         be32_t magic;
  47         uint8_t options[0];
  48 } _packed_;
  49
  50 typedef struct DHCPMessage DHCPMessage;
  51
  52 struct DHCPPacket {
  53         struct iphdr ip;
  54         struct udphdr udp;
  55         DHCPMessage dhcp;
  56 } _packed_;
  57
  58 typedef struct DHCPPacket DHCPPacket;
  59
  60 #define DHCP_IP_SIZE            (int32_t)(sizeof(struct iphdr))
  61 #define DHCP_IP_UDP_SIZE        (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE)
  62 #define DHCP_MESSAGE_SIZE       (int32_t)(sizeof(DHCPMessage))
  63 #define DHCP_DEFAULT_MIN_SIZE   576 /* the minimum internet hosts must be able to receive */
  64 #define DHCP_MIN_OPTIONS_SIZE   DHCP_DEFAULT_MIN_SIZE - DHCP_IP_UDP_SIZE - DHCP_MESSAGE_SIZE
  65 #define DHCP_MAGIC_COOKIE       (uint32_t)(0x63825363)
  66
  67 enum {
  68         DHCP_PORT_SERVER                        = 67,
  69         DHCP_PORT_CLIENT                        = 68,
  70 };
  71
  72 enum DHCPState {
  73         DHCP_STATE_INIT                         = 0,
  74         DHCP_STATE_SELECTING                    = 1,
  75         DHCP_STATE_INIT_REBOOT                  = 2,
  76         DHCP_STATE_REBOOTING                    = 3,
  77         DHCP_STATE_REQUESTING                   = 4,
  78         DHCP_STATE_BOUND                        = 5,
  79         DHCP_STATE_RENEWING                     = 6,
  80         DHCP_STATE_REBINDING                    = 7,
  81         DHCP_STATE_STOPPED                      = 8,
  82 };
  83
  84 typedef enum DHCPState DHCPState;
  85
  86 enum {
  87         BOOTREQUEST                             = 1,
  88         BOOTREPLY                               = 2,
  89 };
  90
  91 enum {
  92         DHCP_DISCOVER                           = 1,
  93         DHCP_OFFER                              = 2,
  94         DHCP_REQUEST                            = 3,
  95         DHCP_DECLINE                            = 4,
  96         DHCP_ACK                                = 5,
  97         DHCP_NAK                                = 6,
  98         DHCP_RELEASE                            = 7,
  99         DHCP_INFORM                             = 8,
 100         DHCP_FORCERENEW                         = 9,
 101 };
 102
 103 enum {
 104         DHCP_OVERLOAD_FILE                      = 1,
 105         DHCP_OVERLOAD_SNAME                     = 2,
 106 };
 107
 108 enum {
 109         DHCP_OPTION_PAD                         = 0,
 110         DHCP_OPTION_SUBNET_MASK                 = 1,
 111         DHCP_OPTION_TIME_OFFSET                 = 2,
 112         DHCP_OPTION_ROUTER                      = 3,
 113         DHCP_OPTION_DOMAIN_NAME_SERVER          = 6,
 114         DHCP_OPTION_HOST_NAME                   = 12,
 115         DHCP_OPTION_BOOT_FILE_SIZE              = 13,
 116         DHCP_OPTION_DOMAIN_NAME                 = 15,
 117         DHCP_OPTION_ROOT_PATH                   = 17,
 118         DHCP_OPTION_ENABLE_IP_FORWARDING        = 19,
 119         DHCP_OPTION_ENABLE_IP_FORWARDING_NL     = 20,
 120         DHCP_OPTION_POLICY_FILTER               = 21,
 121         DHCP_OPTION_INTERFACE_MDR               = 22,
 122         DHCP_OPTION_INTERFACE_TTL               = 23,
 123         DHCP_OPTION_INTERFACE_MTU_AGING_TIMEOUT = 24,
 124         DHCP_OPTION_INTERFACE_MTU               = 26,
 125         DHCP_OPTION_BROADCAST                   = 28,
 126         DHCP_OPTION_STATIC_ROUTE                = 33,
 127         DHCP_OPTION_NTP_SERVER                  = 42,
 128         DHCP_OPTION_REQUESTED_IP_ADDRESS        = 50,
 129         DHCP_OPTION_IP_ADDRESS_LEASE_TIME       = 51,
 130         DHCP_OPTION_OVERLOAD                    = 52,
 131         DHCP_OPTION_MESSAGE_TYPE                = 53,
 132         DHCP_OPTION_SERVER_IDENTIFIER           = 54,
 133         DHCP_OPTION_PARAMETER_REQUEST_LIST      = 55,
 134         DHCP_OPTION_MAXIMUM_MESSAGE_SIZE        = 57,
 135         DHCP_OPTION_RENEWAL_T1_TIME             = 58,
 136         DHCP_OPTION_REBINDING_T2_TIME           = 59,
 137         DHCP_OPTION_VENDOR_CLASS_IDENTIFIER     = 60,
 138         DHCP_OPTION_CLIENT_IDENTIFIER           = 61,
 139         DHCP_OPTION_CLASSLESS_STATIC_ROUTE      = 121,
 140         DHCP_OPTION_END                         = 255,
 141 };