release/src/router/openvpn/dhcp.h

   1 /*
   2  *  OpenVPN -- An application to securely tunnel IP networks
   3  *             over a single TCP/UDP port, with support for SSL/TLS-based
   4  *             session authentication and key exchange,
   5  *             packet encryption, packet authentication, and
   6  *             packet compression.
   7  *
   8  *  Copyright (C) 2002-2009 OpenVPN Technologies, Inc. <sales@openvpn.net>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  as published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program (see the file COPYING included with this
  21  *  distribution); if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #ifndef DHCP_H
  26 #define DHCP_H
  27
  28 #include "common.h"
  29 #include "buffer.h"
  30 #include "proto.h"
  31
  32 #pragma pack(1)
  33
  34 /* DHCP Option types */
  35 #define DHCP_PAD          0
  36 #define DHCP_ROUTER       3
  37 #define DHCP_MSG_TYPE    53  /* message type (u8) */
  38 #define DHCP_END        255
  39
  40 /* DHCP Messages types */
  41 #define DHCPDISCOVER 1
  42 #define DHCPOFFER    2
  43 #define DHCPREQUEST  3
  44 #define DHCPDECLINE  4
  45 #define DHCPACK      5
  46 #define DHCPNAK      6
  47 #define DHCPRELEASE  7
  48 #define DHCPINFORM   8
  49
  50 /* DHCP UDP port numbers */
  51 #define BOOTPS_PORT 67
  52 #define BOOTPC_PORT 68
  53
  54 struct dhcp {
  55 # define BOOTREQUEST 1
  56 # define BOOTREPLY   2
  57   uint8_t op;          /* message op */
  58
  59   uint8_t  htype;      /* hardware address type (e.g. '1' = 10Mb Ethernet) */
  60   uint8_t  hlen;       /* hardware address length (e.g. '6' for 10Mb Ethernet) */
  61   uint8_t  hops;       /* client sets to 0, may be used by relay agents */
  62   uint32_t xid;        /* transaction ID, chosen by client */
  63   uint16_t secs;       /* seconds since request process began, set by client */
  64   uint16_t flags;
  65   uint32_t ciaddr;     /* client IP address, client sets if known */
  66   uint32_t yiaddr;     /* 'your' IP address -- server's response to client */
  67   uint32_t siaddr;     /* server IP address */
  68   uint32_t giaddr;     /* relay agent IP address */
  69   uint8_t  chaddr[16]; /* client hardware address */
  70   uint8_t  sname[64];  /* optional server host name */
  71   uint8_t  file[128];  /* boot file name */
  72   uint32_t magic;      /* must be 0x63825363 (network order) */
  73 };
  74
  75 struct dhcp_full {
  76   struct openvpn_iphdr ip;
  77   struct openvpn_udphdr udp;
  78   struct dhcp dhcp;
  79 # define DHCP_OPTIONS_BUFFER_SIZE 256
  80   uint8_t options[DHCP_OPTIONS_BUFFER_SIZE];
  81 };
  82
  83 #pragma pack()
  84
  85 in_addr_t dhcp_extract_router_msg (struct buffer *ipbuf);
  86
  87 #endif