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/** @file
The DHCP4 protocol implementation.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __EFI_DHCP4_IO_H__
#define __EFI_DHCP4_IO_H__
#include <Uefi.h>
#include <Protocol/ServiceBinding.h>
#include <Library/NetLib.h>
#include <Library/UdpIoLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#define DHCP_WAIT_OFFER 3 // Time to wait the offers
#define DHCP_DEFAULT_LEASE 7 * 24 * 60 * 60 // Seven days as default.
#define DHCP_SERVER_PORT 67
#define DHCP_CLIENT_PORT 68
//
// BOOTP header "op" field
//
#define BOOTP_REQUEST 1
#define BOOTP_REPLY 2
//
// DHCP message types
//
#define DHCP_MSG_DISCOVER 1
#define DHCP_MSG_OFFER 2
#define DHCP_MSG_REQUEST 3
#define DHCP_MSG_DECLINE 4
#define DHCP_MSG_ACK 5
#define DHCP_MSG_NAK 6
#define DHCP_MSG_RELEASE 7
#define DHCP_MSG_INFORM 8
//
// DHCP notify user type
//
#define DHCP_NOTIFY_COMPLETION 1
#define DHCP_NOTIFY_RENEWREBIND 2
#define DHCP_NOTIFY_ALL 3
#define DHCP_IS_BOOTP(Parameter) (((Parameter) == NULL) || ((Parameter)->DhcpType == 0))
#define DHCP_CONNECTED(State) \
(((State) == Dhcp4Bound) || ((State) == (Dhcp4Renewing)) || ((State) == Dhcp4Rebinding))
/**
Set the DHCP state. If CallUser is true, it will try to notify
the user before change the state by DhcpNotifyUser. It returns
EFI_ABORTED if the user return EFI_ABORTED, otherwise, it returns
EFI_SUCCESS. If CallUser is FALSE, it isn't necessary to test
the return value of this function.
@param DhcpSb The DHCP service instance
@param State The new DHCP state to change to
@param CallUser Whether we need to call user
@retval EFI_SUCCESS The state is changed
@retval EFI_ABORTED The user asks to abort the DHCP process.
**/
EFI_STATUS
DhcpSetState (
IN OUT DHCP_SERVICE *DhcpSb,
IN INTN State,
IN BOOLEAN CallUser
);
/**
Build and transmit a DHCP message according to the current states.
This function implement the Table 5. of RFC 2131. Always transits
the state (as defined in Figure 5. of the same RFC) before sending
a DHCP message. The table is adjusted accordingly.
@param[in] DhcpSb The DHCP service instance
@param[in] Seed The seed packet which the new packet is based on
@param[in] Para The DHCP parameter of the Seed packet
@param[in] Type The message type to send
@param[in] Msg The human readable message to include in the packet
sent.
@retval EFI_OUT_OF_RESOURCES Failed to allocate resources for the packet
@retval EFI_ACCESS_DENIED Failed to transmit the packet through UDP
@retval EFI_SUCCESS The message is sent
@retval other Other error occurs
**/
EFI_STATUS
DhcpSendMessage (
IN DHCP_SERVICE *DhcpSb,
IN EFI_DHCP4_PACKET *Seed,
IN DHCP_PARAMETER *Para,
IN UINT8 Type,
IN UINT8 *Msg
);
/**
Each DHCP service has three timer. Two of them are count down timer.
One for the packet retransmission. The other is to collect the offers.
The third timer increments the lease life which is compared to T1, T2,
and lease to determine the time to renew and rebind the lease.
DhcpOnTimerTick will be called once every second.
@param[in] Event The timer event
@param[in] Context The context, which is the DHCP service instance.
**/
VOID
EFIAPI
DhcpOnTimerTick (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
Handle the received DHCP packets. This function drives the DHCP
state machine.
@param UdpPacket The UDP packets received.
@param EndPoint The local/remote UDP access point
@param IoStatus The status of the UDP receive
@param Context The opaque parameter to the function.
**/
VOID
EFIAPI
DhcpInput (
NET_BUF *UdpPacket,
UDP_END_POINT *EndPoint,
EFI_STATUS IoStatus,
VOID *Context
);
/**
Send an initial DISCOVER or REQUEST message according to the
DHCP service's current state.
@param[in] DhcpSb The DHCP service instance
@retval EFI_SUCCESS The request has been sent
@retval other Some error occurs when sending the request.
**/
EFI_STATUS
DhcpInitRequest (
IN DHCP_SERVICE *DhcpSb
);
/**
Clean up the DHCP related states, IoStatus isn't reset.
@param DhcpSb The DHCP instance service.
**/
VOID
DhcpCleanLease (
IN DHCP_SERVICE *DhcpSb
);
/**
Release the net buffer when packet is sent.
@param UdpPacket The UDP packets received.
@param EndPoint The local/remote UDP access point
@param IoStatus The status of the UDP receive
@param Context The opaque parameter to the function.
**/
VOID
EFIAPI
DhcpOnPacketSent (
NET_BUF *Packet,
UDP_END_POINT *EndPoint,
EFI_STATUS IoStatus,
VOID *Context
);
#endif
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