src/dhcpv4.h

   1 /**
   2  *   Copyright (C) 2012 Steven Barth <steven@midlink.org>
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License version 2 for more details.
  12  *
  13  */
  14 #pragma once
  15
  16 #define DHCPV4_CLIENT_PORT 68
  17 #define DHCPV4_SERVER_PORT 67
  18
  19 #define DHCPV4_FLAG_BROADCAST  0x8000
  20
  21 enum dhcpv4_op {
  22         DHCPV4_BOOTREQUEST = 1,
  23         DHCPV4_BOOTREPLY = 2
  24 };
  25
  26 enum dhcpv4_msg {
  27         DHCPV4_MSG_DISCOVER = 1,
  28         DHCPV4_MSG_OFFER = 2,
  29         DHCPV4_MSG_REQUEST = 3,
  30         DHCPV4_MSG_DECLINE = 4,
  31         DHCPV4_MSG_ACK = 5,
  32         DHCPV4_MSG_NAK = 6,
  33         DHCPV4_MSG_RELEASE = 7,
  34         DHCPV4_MSG_INFORM = 8,
  35 };
  36
  37 enum dhcpv4_opt {
  38         DHCPV4_OPT_NETMASK = 1,
  39         DHCPV4_OPT_ROUTER = 3,
  40         DHCPV4_OPT_DNSSERVER = 6,
  41         DHCPV4_OPT_DOMAIN = 15,
  42         DHCPV4_OPT_MTU = 26,
  43         DHCPV4_OPT_BROADCAST = 28,
  44         DHCPV4_OPT_NTPSERVER = 42,
  45         DHCPV4_OPT_LEASETIME = 51,
  46         DHCPV4_OPT_MESSAGE = 53,
  47         DHCPV4_OPT_SERVERID = 54,
  48         DHCPV4_OPT_RENEW = 58,
  49         DHCPV4_OPT_REBIND = 59,
  50         DHCPV4_OPT_IPADDRESS = 50,
  51         DHCPV4_OPT_HOSTNAME = 10,
  52         DHCPV4_OPT_REQUEST = 17,
  53         DHCPV4_OPT_VENDOR_SPECIFIC_INFORMATION = 125,
  54         DHCPV4_OPT_END = 255,
  55 };
  56
  57 struct dhcpv4_message {
  58         uint8_t op;
  59         uint8_t htype;
  60         uint8_t hlen;
  61         uint8_t hops;
  62         uint32_t xid;
  63         uint16_t secs;
  64         uint16_t flags;
  65         struct in_addr ciaddr;
  66         struct in_addr yiaddr;
  67         struct in_addr siaddr;
  68         struct in_addr giaddr;
  69         uint8_t chaddr[16];
  70         char sname[64];
  71         char file[128];
  72         uint8_t options[312];
  73 };
  74
  75 struct dhcpv4_assignment {
  76         struct list_head head;
  77         uint32_t addr;
  78         time_t valid_until;
  79         uint8_t hwaddr[6];
  80         char hostname[];
  81 };
  82
  83 struct dhcpv4_option {
  84         uint8_t type;
  85         uint8_t len;
  86         uint8_t data[];
  87 };
  88
  89
  90 #define dhcpv4_for_each_option(start, end, opt)\
  91         for (opt = (struct dhcpv4_option*)(start); \
  92                 &opt[1] <= (struct dhcpv4_option*)(end) && \
  93                         &opt->data[opt->len] <= (end); \
  94                 opt = (struct dhcpv4_option*)&opt->data[opt->len])