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 } _packed_;
  48
  49 typedef struct DHCPMessage DHCPMessage;
  50
  51 struct DHCPPacket {
  52         struct iphdr ip;
  53         struct udphdr udp;
  54         DHCPMessage dhcp;
  55 } _packed_;
  56
  57 typedef struct DHCPPacket DHCPPacket;
  58
  59 #define DHCP_IP_SIZE            (int32_t)(sizeof(struct iphdr))
  60 #define DHCP_IP_UDP_SIZE        (int32_t)(sizeof(struct udphdr) + DHCP_IP_SIZE)
  61 #define DHCP_MESSAGE_SIZE       (int32_t)(sizeof(DHCPMessage))
  62 #define DHCP_MIN_OPTIONS_SIZE   308
  63 #define DHCP_MAGIC_COOKIE       (uint32_t)(0x63825363)
  64
  65 enum {
  66         DHCP_PORT_SERVER                        = 67,
  67         DHCP_PORT_CLIENT                        = 68,
  68 };
  69
  70 enum DHCPState {
  71         DHCP_STATE_INIT                         = 0,
  72         DHCP_STATE_SELECTING                    = 1,
  73         DHCP_STATE_INIT_REBOOT                  = 2,
  74         DHCP_STATE_REBOOTING                    = 3,
  75         DHCP_STATE_REQUESTING                   = 4,
  76         DHCP_STATE_BOUND                        = 5,
  77         DHCP_STATE_RENEWING                     = 6,
  78         DHCP_STATE_REBINDING                    = 7,
  79         DHCP_STATE_STOPPED                      = 8,
  80 };
  81
  82 typedef enum DHCPState DHCPState;
  83
  84 enum {
  85         BOOTREQUEST                             = 1,
  86         BOOTREPLY                               = 2,
  87 };
  88
  89 enum {
  90         DHCP_DISCOVER                           = 1,
  91         DHCP_OFFER                              = 2,
  92         DHCP_REQUEST                            = 3,
  93         DHCP_DECLINE                            = 4,
  94         DHCP_ACK                                = 5,
  95         DHCP_NAK                                = 6,
  96         DHCP_RELEASE                            = 7,
  97 };
  98
  99 enum {
 100         DHCP_OVERLOAD_FILE                      = 1,
 101         DHCP_OVERLOAD_SNAME                     = 2,
 102 };
 103
 104 enum {
 105         DHCP_OPTION_PAD                         = 0,
 106         DHCP_OPTION_SUBNET_MASK                 = 1,
 107         DHCP_OPTION_ROUTER                      = 3,
 108         DHCP_OPTION_DOMAIN_NAME_SERVER          = 6,
 109         DHCP_OPTION_HOST_NAME                   = 12,
 110         DHCP_OPTION_DOMAIN_NAME                 = 15,
 111         DHCP_OPTION_ROOT_PATH                   = 17,
 112         DHCP_OPTION_INTERFACE_MTU               = 26,
 113         DHCP_OPTION_NTP_SERVER                  = 42,
 114         DHCP_OPTION_REQUESTED_IP_ADDRESS        = 50,
 115         DHCP_OPTION_IP_ADDRESS_LEASE_TIME       = 51,
 116         DHCP_OPTION_OVERLOAD                    = 52,
 117         DHCP_OPTION_MESSAGE_TYPE                = 53,
 118         DHCP_OPTION_SERVER_IDENTIFIER           = 54,
 119         DHCP_OPTION_PARAMETER_REQUEST_LIST      = 55,
 120         DHCP_OPTION_MAXIMUM_MESSAGE_SIZE        = 57,
 121         DHCP_OPTION_RENEWAL_T1_TIME             = 58,
 122         DHCP_OPTION_REBINDING_T2_TIME           = 59,
 123         DHCP_OPTION_CLIENT_IDENTIFIER           = 61,
 124         DHCP_OPTION_END                         = 255,
 125 };