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281 lines
6.9 KiB
C++
281 lines
6.9 KiB
C++
/*
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* \brief DHCP related definitions
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* \author Stefan Kalkowski
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* \date 2010-08-19
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*/
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/*
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* Copyright (C) 2010-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _DHCP_H_
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#define _DHCP_H_
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/* Genode */
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#include <base/exception.h>
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#include <base/stdint.h>
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#include <util/endian.h>
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#include <net/ethernet.h>
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#include <net/ipv4.h>
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#include <net/udp.h>
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namespace Net { class Dhcp_packet; }
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/**
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* Data layout of this class conforms to an DHCP packet (RFC 2131)
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*
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* DHCP packet layout:
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*
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* ===================================
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* | 1 byte | 1 byte | 1 byte | 1 byte |
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* ===================================
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* | op | htype | hlen | hops |
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* -----------------------------------
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* | connection-id (xid) |
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* -----------------------------------
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* | seconds | flags |
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* -----------------------------------
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* | client-ip-address |
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* -----------------------------------
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* | your-ip-address |
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* -----------------------------------
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* | server-ip-address |
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* -----------------------------------
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* | relay-agent-ip-address |
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* -----------------------------------
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* | client-hw-address |
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* | (16 bytes) |
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* -----------------------------------
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* | sname |
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* | (64 bytes) |
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* -----------------------------------
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* | file |
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* | (128 bytes) |
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* -----------------------------------
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* | options |
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* | (312 bytes, optional) |
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* -----------------------------------
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*/
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class Net::Dhcp_packet
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{
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public:
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class No_dhcp_packet : Genode::Exception {};
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class Client_hw_address
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{
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public:
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Genode::uint8_t addr[16];
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};
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private:
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/************************
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** DHCP packet fields **
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************************/
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Genode::uint8_t _op;
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Genode::uint8_t _htype;
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Genode::uint8_t _hlen;
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Genode::uint8_t _hops;
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Genode::uint32_t _xid;
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Genode::uint16_t _secs;
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Genode::uint16_t _flags;
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Genode::uint8_t _ciaddr[Ipv4_packet::ADDR_LEN];
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Genode::uint8_t _yiaddr[Ipv4_packet::ADDR_LEN];
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Genode::uint8_t _siaddr[Ipv4_packet::ADDR_LEN];
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Genode::uint8_t _giaddr[Ipv4_packet::ADDR_LEN];
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Client_hw_address _chaddr;
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Genode::uint8_t _sname[64];
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Genode::uint8_t _file[128];
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Genode::uint32_t _magic_cookie;
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Genode::uint8_t _opts[0];
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enum Flag {
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BROADCAST = 0x80
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};
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public:
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/**
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* This class represents the data layout of an DHCP option.
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*/
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class Option
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{
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private:
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Genode::uint8_t _code;
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Genode::uint8_t _len;
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Genode::uint8_t _value[0];
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public:
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Option() {}
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Genode::uint8_t code() { return _code; }
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Genode::size_t length() { return _len; }
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void* value() { return _value; }
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/**
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* Placement new.
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*/
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void * operator new(Genode::size_t size, void* addr) {
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return addr; }
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} __attribute__((packed));
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enum Opcode {
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REQUEST = 1,
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REPLY = 2,
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INVALID
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};
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enum Udp_port {
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BOOTPS = 67,
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BOOTPC = 68
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};
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enum Option_type {
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REQ_IP_ADDR = 50,
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IP_LEASE_TIME = 51,
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OPT_OVERLOAD = 52,
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MSG_TYPE = 53,
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SRV_ID = 54,
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REQ_PARAMETER = 55,
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MESSAGE = 56,
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MAX_MSG_SZ = 57,
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RENEWAL = 58,
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REBINDING = 59,
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VENDOR = 60,
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CLI_ID = 61,
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TFTP_SRV_NAME = 66,
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BOOT_FILE = 67,
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END = 255
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};
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enum Message_type {
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DHCP_DISCOVER = 1,
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DHCP_OFFER = 2,
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DHCP_REQUEST = 3,
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DHCP_DECLINE = 4,
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DHCP_ACK = 5,
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DHCP_NAK = 6,
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DHCP_RELEASE = 7,
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DHCP_INFORM = 8
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};
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/*****************
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** Constructor **
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*****************/
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Dhcp_packet(Genode::size_t size) {
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/* dhcp packet needs to fit in */
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if (size < sizeof(Dhcp_packet))
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throw No_dhcp_packet();
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}
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/*******************************
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** DHCP field read-accessors **
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*******************************/
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Genode::uint8_t op() { return _op; }
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Genode::uint8_t htype() { return _htype; }
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Genode::uint8_t hlen() { return _hlen; }
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Genode::uint8_t hops() { return _hops; }
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Genode::uint32_t xid() { return host_to_big_endian(_xid); }
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Genode::uint16_t secs() { return host_to_big_endian(_secs); }
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bool broadcast() { return _flags & BROADCAST; }
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Ipv4_packet::Ipv4_address ciaddr() {
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return Ipv4_packet::Ipv4_address(&_ciaddr); }
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Ipv4_packet::Ipv4_address yiaddr() {
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return Ipv4_packet::Ipv4_address(&_yiaddr); }
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Ipv4_packet::Ipv4_address siaddr() {
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return Ipv4_packet::Ipv4_address(&_siaddr); }
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Ipv4_packet::Ipv4_address giaddr() {
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return Ipv4_packet::Ipv4_address(&_giaddr); }
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Ethernet_frame::Mac_address client_mac() {
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return Ethernet_frame::Mac_address(&_chaddr); }
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const char* server_name() { return (const char*) &_sname; }
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const char* file() { return (const char*) &_file; }
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Option *option(Option_type op)
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{
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void *ptr = &_opts;
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while (true) {
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Option *ext = new (ptr) Option();
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if (ext->code() == op)
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return ext;
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if (ext->code() == END || ext->code() == 0)
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break;
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ptr = ext + ext->length();
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}
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return 0;
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}
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/*******************************
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** DHCP field write-accessors **
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*******************************/
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void op(Genode::uint8_t op) { _op = op; }
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void htype(Genode::uint8_t htype) { _htype = htype; }
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void hlen(Genode::uint8_t hlen) { _hlen = hlen; }
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void hops(Genode::uint8_t hops) { _hops = hops; }
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void xid(Genode::uint32_t xid) { _xid = host_to_big_endian(_xid); }
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void secs(Genode::uint16_t secs) { _secs = host_to_big_endian(_secs); }
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void broadcast(bool broadcast) {
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_flags = broadcast ? BROADCAST : 0; }
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void ciaddr(Ipv4_packet::Ipv4_address ciaddr) {
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ciaddr.copy(&_ciaddr); }
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void yiaddr(Ipv4_packet::Ipv4_address yiaddr) {
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yiaddr.copy(&_yiaddr); }
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void siaddr(Ipv4_packet::Ipv4_address siaddr) {
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siaddr.copy(&_siaddr); }
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void giaddr(Ipv4_packet::Ipv4_address giaddr) {
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giaddr.copy(&_giaddr); }
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void client_mac(Ethernet_frame::Mac_address mac) {
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mac.copy(&_chaddr); }
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/*************************
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** Convenience methods **
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*************************/
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static bool is_dhcp(Udp_packet *udp)
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{
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return ((udp->src_port() == Dhcp_packet::BOOTPC ||
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udp->src_port() == Dhcp_packet::BOOTPS) &&
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(udp->dst_port() == Dhcp_packet::BOOTPC ||
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udp->dst_port() == Dhcp_packet::BOOTPS));
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}
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/***************
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** Operators **
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***************/
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/**
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* Placement new.
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*/
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void * operator new(Genode::size_t size, void* addr) {
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return addr; }
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} __attribute__((packed));
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#endif /* _DHCP_H_ */
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