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net: utilities for DHCP parameter-request lists

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Issue #2738
This commit is contained in:
Martin Stein 2018-04-06 17:32:36 +02:00 committed by Christian Helmuth
parent 77e968a5e3
commit ca1751528d
1 changed files with 54 additions and 0 deletions
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54
repos/os/include/net/dhcp.h
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@ -136,6 +136,7 @@ class Net::Dhcp_packet
IP_LEASE_TIME = 51,
MSG_TYPE = 53,
SERVER = 54,
PARAM_REQ_LIST = 55,
MAX_MSG_SZ = 57,
CLI_ID = 61,
END = 255,
@ -194,6 +195,16 @@ class Net::Dhcp_packet
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) { }
};
enum class Message_type : Genode::uint8_t {
DISCOVER = 1,
OFFER = 2,
@ -306,6 +317,34 @@ class Net::Dhcp_packet
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.add(sizeof(_base[0]));
_base[_size] = (Genode::uint8_t)OPTION::CODE;
_size++;
}
Genode::size_t size() const { return _size; }
};
Options_aggregator(Dhcp_packet &packet,
SIZE_GUARD &size_guard)
:
@ -321,6 +360,21 @@ class Net::Dhcp_packet
static_cast<ARGS &&>(args)...);
_base += sizeof(OPTION);
}
template <typename INIT_DATA>
void append_param_req_list(INIT_DATA && init_data)
{
_size_guard.add(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();
}
};