/** @file

Copyright (c) 2004 - 2007, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

Module Name:
  pxe_bc_udp.c

Abstract:


**/

#include "Bc.h"

//
// //////////////////////////////////////////////////////////////////////
//
//  Udp Write Routine - called by base code - e.g. TFTP - already locked
//

/**

  @return EFI_SUCCESS :=
  @return EFI_INVALID_PARAMETER :=
  @return other :=

**/
EFI_STATUS
UdpWrite (
  IN PXE_BASECODE_DEVICE            *Private,
  IN UINT16                         OpFlags,
  IN EFI_IP_ADDRESS                 *DestIpPtr,
  IN EFI_PXE_BASE_CODE_UDP_PORT     *DestPortPtr,
  IN EFI_IP_ADDRESS                 *GatewayIpPtr, OPTIONAL
  IN EFI_IP_ADDRESS                 *SrcIpPtr, OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT *SrcPortPtr, OPTIONAL
  IN UINTN                          *HeaderSizePtr, OPTIONAL
  IN VOID                           *HeaderPtr, OPTIONAL
  IN UINTN                          *BufferSizeptr,
  IN VOID                           *BufferPtr
  )
{
  UINTN                       TotalLength;
  UINTN                       HeaderSize;
  EFI_PXE_BASE_CODE_UDP_PORT  DefaultSrcPort;

  //
  //
  //
  HeaderSize      = (HeaderSizePtr != NULL) ? *HeaderSizePtr : 0;
  DefaultSrcPort  = 0;

  //
  // check parameters
  //
  if (BufferSizeptr == NULL ||
      BufferPtr == NULL ||
      DestIpPtr == NULL ||
      DestPortPtr == NULL ||
      (HeaderSizePtr != NULL && *HeaderSizePtr == 0) ||
      (HeaderSize != 0 && HeaderPtr == NULL) ||
      (GatewayIpPtr != NULL && !IS_INADDR_UNICAST(GatewayIpPtr)) ||
      (OpFlags &~(EFI_PXE_BASE_CODE_UDP_OPFLAGS_MAY_FRAGMENT | EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_PORT))
      ) {
    DEBUG (
      (DEBUG_WARN,
      "\nUdpWrite()  Exit #1  %xh (%r)",
      EFI_INVALID_PARAMETER,
      EFI_INVALID_PARAMETER)
      );

    return EFI_INVALID_PARAMETER;
  }

  TotalLength = *BufferSizeptr + HeaderSize + sizeof (UDPV4_HEADER);

  if (TotalLength > 0x0000ffff) {
    DEBUG (
      (DEBUG_WARN,
      "\nUdpWrite()  Exit #2  %xh (%r)",
      EFI_BAD_BUFFER_SIZE,
      EFI_BAD_BUFFER_SIZE)
      );

    return EFI_BAD_BUFFER_SIZE;
  }

  if (SrcIpPtr == NULL) {
    SrcIpPtr = &Private->EfiBc.Mode->StationIp;
  }

  if (SrcPortPtr == NULL) {
    SrcPortPtr = &DefaultSrcPort;
    OpFlags |= EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_PORT;
  }

  if (OpFlags & EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_PORT) {
    *SrcPortPtr = Private->RandomPort;

    if (++Private->RandomPort == 0) {
      Private->RandomPort = PXE_RND_PORT_LOW;
    }
  }

#define IpTxBuffer  ((IPV4_BUFFER *) Private->TransmitBufferPtr)
  //
  // build pseudo header and udp header in transmit buffer
  //
#define Udpv4Base ((UDPV4_HEADERS *) (IpTxBuffer->u.Data - sizeof (UDPV4_PSEUDO_HEADER)))

  Udpv4Base->Udpv4PseudoHeader.SrcAddr.L    = SrcIpPtr->Addr[0];
  Udpv4Base->Udpv4PseudoHeader.DestAddr.L   = DestIpPtr->Addr[0];
  Udpv4Base->Udpv4PseudoHeader.Zero         = 0;
  Udpv4Base->Udpv4PseudoHeader.Protocol     = PROT_UDP;
  Udpv4Base->Udpv4PseudoHeader.TotalLength  = HTONS (TotalLength);
  Udpv4Base->Udpv4Header.SrcPort            = HTONS (*SrcPortPtr);
  Udpv4Base->Udpv4Header.DestPort           = HTONS (*DestPortPtr);
  Udpv4Base->Udpv4Header.TotalLength        = Udpv4Base->Udpv4PseudoHeader.TotalLength;
  Udpv4Base->Udpv4Header.Checksum           = 0;

  if (HeaderSize != 0) {
    CopyMem (IpTxBuffer->u.Udp.Data, HeaderPtr, HeaderSize);
  }

  HeaderSize += sizeof (UDPV4_HEADER);

  Udpv4Base->Udpv4Header.Checksum = IpChecksum2 (
                                      (UINT16 *) Udpv4Base,
                                      HeaderSize + sizeof (UDPV4_PSEUDO_HEADER),
                                      (UINT16 *) BufferPtr,
                                      (UINT16) *BufferSizeptr
                                      );

  if (Udpv4Base->Udpv4Header.Checksum == 0) {
    Udpv4Base->Udpv4Header.Checksum = 0xffff;
    //
    // transmit zero checksum as ones complement
    //
  }

  return Ip4Send (
          Private,
          OpFlags,
          PROT_UDP,
          Udpv4Base->Udpv4PseudoHeader.SrcAddr.L,
          Udpv4Base->Udpv4PseudoHeader.DestAddr.L,
          (GatewayIpPtr) ? GatewayIpPtr->Addr[0] : 0,
          HeaderSize,
          BufferPtr,
          *BufferSizeptr
          );
}
//
// //////////////////////////////////////////////////////////
//
//  BC Udp Write Routine
//

/**

  @return EFI_SUCCESS :=
  @return other :=

**/
EFI_STATUS
EFIAPI
BcUdpWrite (
  IN EFI_PXE_BASE_CODE_PROTOCOL     *This,
  IN UINT16                         OpFlags,
  IN EFI_IP_ADDRESS                 *DestIpPtr,
  IN EFI_PXE_BASE_CODE_UDP_PORT     *DestPortPtr,
  IN EFI_IP_ADDRESS                 *GatewayIpPtr, OPTIONAL
  IN EFI_IP_ADDRESS                 *SrcIpPtr, OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT *SrcPortPtr, OPTIONAL
  IN UINTN                          *HeaderSizePtr, OPTIONAL
  IN VOID                           *HeaderPtr, OPTIONAL
  IN UINTN                          *BufferSizeptr,
  IN VOID                           *BufferPtr
  )
{
  EFI_STATUS          StatCode;
  PXE_BASECODE_DEVICE *Private;

  //
  // Lock the instance data and make sure started
  //
  StatCode = EFI_SUCCESS;

  if (This == NULL) {
    DEBUG ((DEBUG_ERROR, "BC *This pointer == NULL"));
    return EFI_INVALID_PARAMETER;
  }

  Private = CR (This, PXE_BASECODE_DEVICE, EfiBc, PXE_BASECODE_DEVICE_SIGNATURE);

  if (Private == NULL) {
    DEBUG ((DEBUG_ERROR, "PXE_BASECODE_DEVICE poiner == NULL"));
    return EFI_INVALID_PARAMETER;
  }

  EfiAcquireLock (&Private->Lock);

  if (This->Mode == NULL || !This->Mode->Started) {
    DEBUG ((DEBUG_ERROR, "BC was not started."));
    EfiReleaseLock (&Private->Lock);
    return EFI_NOT_STARTED;
  }

  Private->Function = EFI_PXE_BASE_CODE_FUNCTION_UDP_WRITE;

  //
  // Issue BC command
  //
  StatCode = UdpWrite (
              Private,
              OpFlags,
              DestIpPtr,
              DestPortPtr,
              GatewayIpPtr,
              SrcIpPtr,
              SrcPortPtr,
              HeaderSizePtr,
              HeaderPtr,
              BufferSizeptr,
              BufferPtr
              );

  //
  // Unlock the instance data
  //
  EfiReleaseLock (&Private->Lock);
  return StatCode;
}
//
// /////////////////////////////////////////////////////////////////////
//
//  Udp Read Routine - called by base code - e.g. TFTP - already locked
//

/**

  @return EFI_SUCCESS :=
  @return EFI_INVALID_PARAMETER :=
  @return other :=

**/
EFI_STATUS
UdpRead (
  IN PXE_BASECODE_DEVICE            *Private,
  IN UINT16                         OpFlags,
  IN OUT EFI_IP_ADDRESS             *DestIpPtr, OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT *DestPortPtr, OPTIONAL
  IN OUT EFI_IP_ADDRESS             *SrcIpPtr, OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT *SrcPortPtr, OPTIONAL
  IN UINTN                          *HeaderSizePtr, OPTIONAL
  IN VOID                           *HeaderPtr, OPTIONAL
  IN OUT UINTN                      *BufferSizeptr,
  IN VOID                           *BufferPtr,
  EFI_EVENT                         TimeoutEvent
  )
{
  EFI_STATUS      StatCode;
  EFI_IP_ADDRESS  TmpSrcIp;
  EFI_IP_ADDRESS  TmpDestIp;
  UINTN           BufferSize;
  UINTN           HeaderSize;

  //
  // combination structure of pseudo header/udp header
  //
#pragma pack (1)
  struct {
    UDPV4_PSEUDO_HEADER Udpv4PseudoHeader;
    UDPV4_HEADER        Udpv4Header;
    UINT8               ProtHdr[64];
  } Hdrs;
#pragma pack ()

  HeaderSize = (HeaderSizePtr != NULL) ? *HeaderSizePtr : 0;
  //
  // read [with filtering]
  // check parameters
  //
  if (BufferSizeptr == NULL ||
      BufferPtr == NULL ||
      (HeaderSize != 0 && HeaderPtr == NULL) ||
      (OpFlags &~UDP_FILTER_MASK)
      //
      // if filtering on a particular IP/Port, need it
      //
      ||
      (!(OpFlags & EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_IP) && SrcIpPtr == NULL) ||
      (!(OpFlags & EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_PORT) && SrcPortPtr == NULL) ||
      (!(OpFlags & EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_DEST_PORT) && DestPortPtr == NULL)
      ) {
    DEBUG ((DEBUG_INFO, "\nUdpRead()  Exit #1  Invalid Parameter"));
    return EFI_INVALID_PARAMETER;
  }

  //
  // in case we loop
  //
  BufferSize = *BufferSizeptr;
  //
  // we need source and dest IPs for pseudo header
  //
  if (SrcIpPtr == NULL) {
    SrcIpPtr = &TmpSrcIp;
  }

  if (DestIpPtr == NULL) {
    DestIpPtr = &TmpDestIp;
    CopyMem (&TmpDestIp, &Private->EfiBc.Mode->StationIp, sizeof (EFI_IP_ADDRESS));
  }

  for (;;) {
    *BufferSizeptr = BufferSize;

    StatCode = IpReceive (
                Private,
                OpFlags,
                SrcIpPtr,
                DestIpPtr,
                PROT_UDP,
                &Hdrs.Udpv4Header,
                HeaderSize + sizeof Hdrs.Udpv4Header,
                BufferPtr,
                BufferSizeptr,
                TimeoutEvent
                );

    if (StatCode == EFI_SUCCESS || StatCode == EFI_BUFFER_TOO_SMALL) {
      UINT16  SPort;
      UINT16  DPort;

      SPort = NTOHS (Hdrs.Udpv4Header.SrcPort);
      DPort = NTOHS (Hdrs.Udpv4Header.DestPort);

      //
      // do filtering
      //
      if (!(OpFlags & EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_PORT) && *SrcPortPtr != SPort) {
        continue;
      }

      if (!(OpFlags & EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_DEST_PORT) && *DestPortPtr != DPort) {
        continue;
      }
      //
      // check checksum
      //
      if (StatCode == EFI_SUCCESS && Hdrs.Udpv4Header.Checksum) {
        Hdrs.Udpv4PseudoHeader.SrcAddr.L    = SrcIpPtr->Addr[0];
        Hdrs.Udpv4PseudoHeader.DestAddr.L   = DestIpPtr->Addr[0];
        Hdrs.Udpv4PseudoHeader.Zero         = 0;
        Hdrs.Udpv4PseudoHeader.Protocol     = PROT_UDP;
        Hdrs.Udpv4PseudoHeader.TotalLength  = Hdrs.Udpv4Header.TotalLength;

        if (Hdrs.Udpv4Header.Checksum == 0xffff) {
          Hdrs.Udpv4Header.Checksum = 0;
        }

        if (IpChecksum2 (
              (UINT16 *) &Hdrs.Udpv4PseudoHeader,
              HeaderSize + sizeof (Hdrs.Udpv4PseudoHeader) + sizeof (Hdrs.Udpv4Header),
              (UINT16 *) BufferPtr,
              *BufferSizeptr
              )) {
          DEBUG (
            (DEBUG_INFO,
            "\nUdpRead()  Hdrs.Udpv4PseudoHeader == %Xh",
            &Hdrs.Udpv4PseudoHeader)
            );
          DEBUG (
            (DEBUG_INFO,
            "\nUdpRead()  Header size == %d",
            HeaderSize + sizeof (Hdrs.Udpv4PseudoHeader))
            );
          DEBUG (
            (DEBUG_INFO,
            "\nUdpRead()  BufferPtr == %Xh",
            BufferPtr)
            );
          DEBUG (
            (DEBUG_INFO,
            "\nUdpRead()  Buffer size == %d",
            *BufferSizeptr)
            );
          DEBUG ((DEBUG_INFO, "\nUdpRead()  Exit #2  Device Error"));
          return EFI_DEVICE_ERROR;
        }
      }
      //
      // all passed
      //
      if (SrcPortPtr != NULL) {
        *SrcPortPtr = SPort;
      }

      if (DestPortPtr != NULL) {
        *DestPortPtr = DPort;
      }

      if (HeaderSize != 0) {
        CopyMem (HeaderPtr, Hdrs.ProtHdr, HeaderSize);
      }
    }

    if ((StatCode != EFI_SUCCESS) && (StatCode != EFI_TIMEOUT)) {
      DEBUG (
        (DEBUG_INFO,
        "\nUdpRead()  Exit #3  %Xh %r",
        StatCode,
        StatCode)
        );
    }

    return StatCode;
  }
}
//
// //////////////////////////////////////////////////////////
//
//  BC Udp Read Routine
//

/**

  @return EFI_SUCCESS :=
  @return other :=

**/
EFI_STATUS
EFIAPI
BcUdpRead (
  IN EFI_PXE_BASE_CODE_PROTOCOL     *This,
  IN UINT16                         OpFlags,
  IN OUT EFI_IP_ADDRESS             *DestIp, OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT *DestPort, OPTIONAL
  IN OUT EFI_IP_ADDRESS             *SrcIp, OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT *SrcPort, OPTIONAL
  IN UINTN                          *HeaderSize, OPTIONAL
  IN VOID                           *HeaderPtr, OPTIONAL
  IN OUT UINTN                      *BufferSize,
  IN VOID                           *BufferPtr
  )
{
  EFI_STATUS          StatCode;
  PXE_BASECODE_DEVICE *Private;

  //
  // Lock the instance data and make sure started
  //
  StatCode = EFI_SUCCESS;

  if (This == NULL) {
    DEBUG ((DEBUG_ERROR, "BC *This pointer == NULL"));
    return EFI_INVALID_PARAMETER;
  }

  Private = CR (This, PXE_BASECODE_DEVICE, EfiBc, PXE_BASECODE_DEVICE_SIGNATURE);

  if (Private == NULL) {
    DEBUG ((DEBUG_ERROR, "PXE_BASECODE_DEVICE poiner == NULL"));
    return EFI_INVALID_PARAMETER;
  }

  EfiAcquireLock (&Private->Lock);

  if (This->Mode == NULL || !This->Mode->Started) {
    DEBUG ((DEBUG_ERROR, "BC was not started."));
    EfiReleaseLock (&Private->Lock);
    return EFI_NOT_STARTED;
  }

  Private->Function = EFI_PXE_BASE_CODE_FUNCTION_UDP_READ;

  //
  // Issue BC command
  //
  StatCode = UdpRead (
              Private,
              OpFlags,
              DestIp,
              DestPort,
              SrcIp,
              SrcPort,
              HeaderSize,
              HeaderPtr,
              BufferSize,
              BufferPtr,
              0
              );

  //
  // Unlock the instance data and return
  //
  EfiReleaseLock (&Private->Lock);
  return StatCode;
}

/* eof - pxe_bc_udp.c */