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genode/repos/os/include/net/dhcp.h
Martin Stein 812fdec27c nic_router: propagate dns domain name via dhcp 
With this commit, the NIC router DHCP client reads out the first DNS domain
name (DHCP option 15) if any from a DHCP reply that generates an IPv4 config
for a domain and stores the name together with the IPv4 config for that domain.
DNS domain names are reported via the new report tag '<dns-domain>' if the
'config' attribute in the config tag '<report>' is set.

Furthermore, the NIC router DHCP server becomes able to obtain a DNS domain
name from another domain that has a DHCP client dynamically (given the config
attribute 'dns_config_from' is set and no static DNS config is given) or
statically from its configuration (new config tag '<dns-domain>') and propagate
this name with DHCP replies (DHCP option 15).

The 'nic_router_dhcp_*' tests are adapted to test the new feautures.

The commit also gets rid of some mirrored files in
'test/nic_router_dhcp/manager'.

Fixes #4246
2021-08-18 15:06:12 +02:00

584 lines
15 KiB
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/*
* \brief DHCP related definitions
* \author Stefan Kalkowski
* \date 2010-08-19
*/
/*
* Copyright (C) 2010-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _NET__DHCP_H_
#define _NET__DHCP_H_
/* Genode */
#include <base/exception.h>
#include <base/stdint.h>
#include <util/construct_at.h>
#include <util/endian.h>
#include <net/ethernet.h>
#include <net/ipv4.h>
#include <net/udp.h>
namespace Net { class Dhcp_packet; }
/**
* Data layout of this class conforms to an DHCP packet (RFC 2131)
*
* DHCP packet layout:
*
* ===================================
* | 1 byte | 1 byte | 1 byte | 1 byte |
* ===================================
* | op | htype | hlen | hops |
* -----------------------------------
* | connection-id (xid) |
* -----------------------------------
* | seconds | flags |
* -----------------------------------
* | client-ip-address |
* -----------------------------------
* | your-ip-address |
* -----------------------------------
* | server-ip-address |
* -----------------------------------
* | relay-agent-ip-address |
* -----------------------------------
* | client-hw-address |
* | (16 bytes) |
* -----------------------------------
* | sname |
* | (64 bytes) |
* -----------------------------------
* | file |
* | (128 bytes) |
* -----------------------------------
* | options |
* | (312 bytes, optional) |
* -----------------------------------
*/
class Net::Dhcp_packet
{
private:
Genode::uint8_t _op;
Genode::uint8_t _htype;
Genode::uint8_t _hlen;
Genode::uint8_t _hops;
Genode::uint32_t _xid;
Genode::uint16_t _secs;
Genode::uint16_t _flags;
Genode::uint8_t _ciaddr[Ipv4_packet::ADDR_LEN];
Genode::uint8_t _yiaddr[Ipv4_packet::ADDR_LEN];
Genode::uint8_t _siaddr[Ipv4_packet::ADDR_LEN];
Genode::uint8_t _giaddr[Ipv4_packet::ADDR_LEN];
Genode::uint8_t _chaddr[16];
Genode::uint8_t _sname[64];
Genode::uint8_t _file[128];
Genode::uint32_t _magic_cookie;
Genode::uint8_t _opts[0];
enum Flag { BROADCAST = 0x80 };
public:
enum class Htype : Genode::uint8_t { ETH = 1 };
enum Opcode {
REQUEST = 1,
REPLY = 2,
INVALID
};
enum Udp_port {
BOOTPS = 67,
BOOTPC = 68
};
void default_magic_cookie() {
_magic_cookie = host_to_big_endian(0x63825363);
}
/*******************************
** Utilities for the options **
*******************************/
/**
* Header of a DHCP option or DHCP option without a payload
*/
class Option
{
private:
Genode::uint8_t _code;
Genode::uint8_t _len;
Genode::uint8_t _value[0];
public:
enum class Code : Genode::uint8_t {
INVALID = 0,
SUBNET_MASK = 1,
ROUTER = 3,
DNS_SERVER = 6,
DOMAIN_NAME = 15,
BROADCAST_ADDR = 28,
REQ_IP_ADDR = 50,
IP_LEASE_TIME = 51,
MSG_TYPE = 53,
SERVER = 54,
PARAM_REQ_LIST = 55,
MAX_MSG_SZ = 57,
CLI_ID = 61,
END = 255,
};
Option(Code code, Genode::uint8_t len)
: _code((Genode::uint8_t)code), _len(len) { }
Code code() const { return (Code)_code; }
Genode::uint8_t len() const { return _len; }
/*********
** log **
*********/
void print(Genode::Output &output) const;
} __attribute__((packed));
struct Option_not_found : Genode::Exception
{
Option::Code const code;
Option_not_found(Option::Code code) : code(code) { }
};
/**
* DHCP option that contains a payload of type T
*/
template <typename T>
class Option_tpl : public Option
{
protected:
T _value;
public:
Option_tpl(Code code, T value)
: Option(code, sizeof(T)), _value(value) { }
} __attribute__((packed));
/**
* DHCP option that specifies the IP packet lease time in seconds
*/
struct Ip_lease_time : Option_tpl<Genode::uint32_t>
{
static constexpr Code CODE = Code::IP_LEASE_TIME;
Ip_lease_time(Genode::uint32_t time)
: Option_tpl(CODE, host_to_big_endian(time)) { }
unsigned long value() const { return host_to_big_endian(_value); }
};
/**
* DHCP option to request specific option type values from the server
*/
struct Parameter_request_list : Option
{
static constexpr Code CODE = Code::PARAM_REQ_LIST;
Parameter_request_list(Genode::size_t len) : Option(CODE, len) { }
};
/**
* Domain name server option
*/
class Dns_server : public Option
{
private:
Ipv4_address _dns_servers[0];
public:
static constexpr Code CODE = Code::DNS_SERVER;
Dns_server(Genode::size_t len) : Option(CODE, len) { }
template <typename FUNC>
void for_each_address(FUNC && func) const
{
for (unsigned idx = 0;
idx < len() / sizeof(_dns_servers[0]); idx++) {
func(_dns_servers[idx]);
}
}
};
/**
* Domain name option
*/
class Domain_name : public Option
{
private:
char _name[0];
public:
static constexpr Code CODE = Code::DOMAIN_NAME;
Domain_name (Genode::size_t len) : Option(CODE, len) { }
template <typename FUNC>
void with_string(FUNC && func) const
{
func(_name, Option::len());
}
};
enum class Message_type : Genode::uint8_t {
DISCOVER = 1,
OFFER = 2,
REQUEST = 3,
DECLINE = 4,
ACK = 5,
NAK = 6,
RELEASE = 7,
INFORM = 8
};
/**
* DHCP option that specifies the DHCP message type
*/
struct Message_type_option : Option_tpl<Genode::uint8_t>
{
static constexpr Code CODE = Code::MSG_TYPE;
Message_type_option(Message_type value)
: Option_tpl(CODE, (Genode::uint8_t)value) { }
Message_type value() const { return (Message_type)_value; }
};
/**
* DHCP options that have only one IPv4 address as payload
*/
template <Option::Code _CODE>
struct Ipv4_option : Option_tpl<Genode::uint32_t>
{
static constexpr Code CODE = _CODE;
Ipv4_option(Ipv4_address value)
: Option_tpl(CODE, value.to_uint32_big_endian()) { }
Ipv4_address value() const {
return Ipv4_address::from_uint32_big_endian(_value); }
};
using Dns_server_ipv4 = Ipv4_option<Option::Code::DNS_SERVER>;
using Subnet_mask = Ipv4_option<Option::Code::SUBNET_MASK>;
using Broadcast_addr = Ipv4_option<Option::Code::BROADCAST_ADDR>;
using Router_ipv4 = Ipv4_option<Option::Code::ROUTER>;
using Server_ipv4 = Ipv4_option<Option::Code::SERVER>;
using Requested_addr = Ipv4_option<Option::Code::REQ_IP_ADDR>;
class Client_id
{
private:
Genode::uint8_t _code;
Genode::uint8_t _len;
Genode::uint8_t _value[7];
public:
Client_id(Mac_address value)
: _code((Genode::uint8_t)Option::Code::CLI_ID), _len(7)
{
_value[0] = 1;
_value[1] = value.addr[0];
_value[2] = value.addr[1];
_value[3] = value.addr[2];
_value[4] = value.addr[3];
_value[5] = value.addr[4];
_value[6] = value.addr[5];
}
Genode::uint8_t code() const { return _code; }
Genode::uint8_t len() const { return _len; }
} __attribute__((packed));
struct Max_msg_size : Option_tpl<Genode::uint16_t>
{
static constexpr Code CODE = Code::MAX_MSG_SZ;
Max_msg_size(Genode::uint16_t size)
: Option_tpl(CODE, host_to_big_endian(size)) { }
};
/**
* DHCP option that marks the end of an options field
*/
struct Options_end : Option
{
static constexpr Code CODE = Code::END;
Options_end() : Option(CODE, 0) { }
};
/**
* Utility to append individual options to an existing DHCP packet
*
* \param SIZE_GUARD guard that may limit the options list size
*
* Overwrites existing options if any!
*/
template <typename SIZE_GUARD>
class Options_aggregator
{
private:
Genode::addr_t _base;
SIZE_GUARD &_size_guard;
public:
class Parameter_request_list_data
{
private:
Genode::uint8_t *const _base;
Genode::size_t _size { 0 };
SIZE_GUARD &_size_guard;
public:
Parameter_request_list_data(Genode::uint8_t *base,
SIZE_GUARD &size_guard)
:
_base { base },
_size_guard { size_guard }
{ }
template <typename OPTION>
void append_param_req()
{
_size_guard.consume_head(sizeof(_base[0]));
_base[_size] = (Genode::uint8_t)OPTION::CODE;
_size++;
}
Genode::size_t size() const { return _size; }
};
class Dns_server_data
{
private:
Ipv4_address *const _addr_array;
Genode::size_t _addr_idx { 0 };
SIZE_GUARD &_pkt_size_guard;
public:
Dns_server_data(Ipv4_address *addr_array,
SIZE_GUARD &pkt_size_guard)
:
_addr_array { addr_array },
_pkt_size_guard { pkt_size_guard }
{ }
void append_address(Ipv4_address const &addr)
{
_pkt_size_guard.consume_head(sizeof(_addr_array[0]));
_addr_array[_addr_idx] = addr;
_addr_idx++;
}
Genode::size_t size() const
{
return _addr_idx * sizeof(Ipv4_address);
}
};
Options_aggregator(Dhcp_packet &packet,
SIZE_GUARD &size_guard)
:
_base((Genode::addr_t)packet.opts()),
_size_guard(size_guard)
{ }
template <typename OPTION, typename... ARGS>
void append_option(ARGS &&... args)
{
_size_guard.consume_head(sizeof(OPTION));
Genode::construct_at<OPTION>((void *)_base,
static_cast<ARGS &&>(args)...);
_base += sizeof(OPTION);
}
template <typename INIT_DATA>
void append_param_req_list(INIT_DATA && init_data)
{
_size_guard.consume_head(sizeof(Parameter_request_list));
Parameter_request_list_data
data((Genode::uint8_t *)(_base + sizeof(Parameter_request_list)),
_size_guard);
init_data(data);
Genode::construct_at<Parameter_request_list>((void *)_base,
data.size());
_base += sizeof(Parameter_request_list) + data.size();
}
template <typename INIT_DATA>
void append_dns_server(INIT_DATA && init_data)
{
Genode::size_t const header_size { sizeof(Dns_server) };
_size_guard.consume_head(header_size);
Dns_server_data data {
(Ipv4_address *)(_base + header_size), _size_guard };
init_data(data);
Genode::construct_at<Dns_server>(
(void *)_base, data.size());
_base += header_size + data.size();
}
void append_domain_name(char const *data_src,
Genode::size_t data_size)
{
Genode::size_t const header_size { sizeof(Domain_name) };
_size_guard.consume_head(header_size + data_size);
Genode::memcpy((char *)(_base + header_size), data_src, data_size);
Genode::construct_at<Domain_name>((void *)_base, data_size);
_base += header_size + data_size;
}
};
/*
* Call 'functor' of type 'FUNC' for each option (except END options)
*/
template <typename FUNC>
void for_each_option(FUNC && functor) const
{
for (unsigned i = 0; ; ) {
Option &opt = *(Option*)&_opts[i];
if (opt.code() == Option::Code::INVALID ||
opt.code() == Option::Code::END)
{
return;
}
functor(opt);
i += 2 + opt.len();
}
}
/*
* Find and return option of given type 'T'
*
* \throw Option_not_found
*/
template <typename T>
T &option()
{
void *ptr = &_opts;
while (true) {
Option &opt = *reinterpret_cast<Option *>(ptr);
if (opt.code() == Option::Code::INVALID ||
opt.code() == Option::Code::END)
{
throw Option_not_found(T::CODE);
}
if (opt.code() == T::CODE) {
return *reinterpret_cast<T *>(ptr);
}
ptr = (void *)((Genode::addr_t)ptr + sizeof(opt) + opt.len());
}
}
/***************
** Accessors **
***************/
Genode::uint8_t op() const { return _op; }
Htype htype() const { return (Htype)_htype; }
Genode::uint8_t hlen() const { return _hlen; }
Genode::uint8_t hops() const { return _hops; }
Genode::uint32_t xid() const { return host_to_big_endian(_xid); }
Genode::uint16_t secs() const { return host_to_big_endian(_secs); }
bool broadcast() const { return _flags & BROADCAST; }
Ipv4_address ciaddr() const { return Ipv4_address((void *)_ciaddr); }
Ipv4_address yiaddr() const { return Ipv4_address((void *)_yiaddr); }
Ipv4_address siaddr() const { return Ipv4_address((void *)_siaddr); }
Ipv4_address giaddr() const { return Ipv4_address((void *)_giaddr); }
Mac_address client_mac() const { return Mac_address((void *)&_chaddr); }
char const *server_name() const { return (char const *)&_sname; }
char const *file() const { return (char const *)&_file; }
Genode::uint32_t magic_cookie() const { return host_to_big_endian(_magic_cookie); }
Genode::uint16_t flags() const { return host_to_big_endian(_flags); }
void *opts() const { return (void *)_opts; }
void flags(Genode::uint16_t v) { _flags = host_to_big_endian(v); }
void file(const char* v) { Genode::memcpy(_file, v, sizeof(_file)); }
void op(Genode::uint8_t v) { _op = v; }
void htype(Htype v) { _htype = (Genode::uint8_t)v; }
void hlen(Genode::uint8_t v) { _hlen = v; }
void hops(Genode::uint8_t v) { _hops = v; }
void xid(Genode::uint32_t v) { _xid = host_to_big_endian(v); }
void secs(Genode::uint16_t v) { _secs = host_to_big_endian(v); }
void broadcast(bool v) { _flags = v ? BROADCAST : 0; }
void ciaddr(Ipv4_address v) { v.copy(&_ciaddr); }
void yiaddr(Ipv4_address v) { v.copy(&_yiaddr); }
void siaddr(Ipv4_address v) { v.copy(&_siaddr); }
void giaddr(Ipv4_address v) { v.copy(&_giaddr); }
void client_mac(Mac_address v) { v.copy(&_chaddr); }
/*************************
** Convenience methods **
*************************/
static bool is_dhcp(Udp_packet const *udp)
{
return ((udp->src_port() == Port(Dhcp_packet::BOOTPC) ||
udp->src_port() == Port(Dhcp_packet::BOOTPS)) &&
(udp->dst_port() == Port(Dhcp_packet::BOOTPC) ||
udp->dst_port() == Port(Dhcp_packet::BOOTPS)));
}
/*********
** log **
*********/
void print(Genode::Output &output) const;
} __attribute__((packed));
#endif /* _NET__DHCP_H_ */
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