src/libsystemd-network/dhcp-protocol.h

   1 #pragma once
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright (C) 2013 Intel Corporation. All rights reserved.
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <netinet/ip.h>
  23 #include <netinet/udp.h>
  24 #include <stdint.h>
  25
  26 #include "macro.h"
  27 #include "sparse-endian.h"
  28
  29 struct DHCPMessage {
  30         uint8_t op;
  31         uint8_t htype;
  32         uint8_t hlen;
  33         uint8_t hops;
  34         be32_t xid;
  35         be16_t secs;
  36         be16_t flags;
  37         be32_t ciaddr;
  38         be32_t yiaddr;
  39         be32_t siaddr;
  40         be32_t giaddr;
  41         uint8_t chaddr[16];
  42         uint8_t sname[64];
  43         uint8_t file[128];
  44         be32_t magic;
  45         uint8_t options[0];
  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_DEFAULT_MIN_SIZE   576 /* the minimum internet hosts must be able to receive */
  62 #define DHCP_MIN_OPTIONS_SIZE   (DHCP_DEFAULT_MIN_SIZE - DHCP_IP_UDP_SIZE - DHCP_MESSAGE_SIZE)
  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         DHCP_INFORM                             = 8,
  98         DHCP_FORCERENEW                         = 9,
  99 };
 100
 101 enum {
 102         DHCP_OVERLOAD_FILE                      = 1,
 103         DHCP_OVERLOAD_SNAME                     = 2,
 104 };
 105
 106 #define DHCP_MAX_FQDN_LENGTH 255
 107
 108 enum {
 109         DHCP_FQDN_FLAG_S = (1 << 0),
 110         DHCP_FQDN_FLAG_O = (1 << 1),
 111         DHCP_FQDN_FLAG_E = (1 << 2),
 112         DHCP_FQDN_FLAG_N = (1 << 3),
 113 };