audk/MdeModulePkg/Universal/Network/SnpDxe/Mcast_ip_to_mac.c

/** @file
 		Implementation of converting an multicast IP address to multicast HW MAC
 		address.
 
Copyright (c) 2004 - 2007, Intel Corporation. <BR> 
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.

**/

#include "Snp.h"

/**
  this routine calls undi to convert an multicast IP address to a MAC address.

  @param  Snp   pointer to snp driver structure
  @param  IPv6  flag to indicate if this is an ipv6 address
  @param  IP    multicast IP address
  @param  MAC   pointer to hold the return MAC address


**/
EFI_STATUS
PxeIp2Mac (
  IN SNP_DRIVER          *Snp,
  IN BOOLEAN             IPv6,
  IN EFI_IP_ADDRESS      *IP,
  IN OUT EFI_MAC_ADDRESS *MAC
  )
{
  PXE_CPB_MCAST_IP_TO_MAC *Cpb;
  PXE_DB_MCAST_IP_TO_MAC  *Db;

  Cpb                 = Snp->Cpb;
  Db                  = Snp->Db;
  Snp->Cdb.OpCode     = PXE_OPCODE_MCAST_IP_TO_MAC;
  Snp->Cdb.OpFlags    = (UINT16) (IPv6 ? PXE_OPFLAGS_MCAST_IPV6_TO_MAC : PXE_OPFLAGS_MCAST_IPV4_TO_MAC);
  Snp->Cdb.CPBsize    = sizeof (PXE_CPB_MCAST_IP_TO_MAC);
  Snp->Cdb.DBsize     = sizeof (PXE_DB_MCAST_IP_TO_MAC);

  Snp->Cdb.CPBaddr    = (UINT64)(UINTN) Cpb;
  Snp->Cdb.DBaddr     = (UINT64)(UINTN) Db;

  Snp->Cdb.StatCode   = PXE_STATCODE_INITIALIZE;
  Snp->Cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
  Snp->Cdb.IFnum      = Snp->IfNum;
  Snp->Cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;

  CopyMem (&Cpb->IP, IP, sizeof (PXE_IP_ADDR));

  //
  // Issue UNDI command and check result.
  //
  DEBUG ((EFI_D_NET, "\nSnp->undi.mcast_ip_to_mac()  "));

  (*Snp->IssueUndi32Command) ((UINT64)(UINTN) &Snp->Cdb);

  switch (Snp->Cdb.StatCode) {
  case PXE_STATCODE_SUCCESS:
    break;

  case PXE_STATCODE_INVALID_CPB:
    return EFI_INVALID_PARAMETER;

  case PXE_STATCODE_UNSUPPORTED:
    DEBUG (
      (EFI_D_NET,
      "\nSnp->undi.mcast_ip_to_mac()  %xh:%xh\n",
      Snp->Cdb.StatFlags,
      Snp->Cdb.StatCode)
      );
    return EFI_UNSUPPORTED;

  default:
    //
    // UNDI command failed.  Return EFI_DEVICE_ERROR
    // to caller.
    //
    DEBUG (
      (EFI_D_NET,
      "\nSnp->undi.mcast_ip_to_mac()  %xh:%xh\n",
      Snp->Cdb.StatFlags,
      Snp->Cdb.StatCode)
      );

    return EFI_DEVICE_ERROR;
  }

  CopyMem (MAC, &Db->MAC, sizeof (PXE_MAC_ADDR));
  return EFI_SUCCESS;
}


/**
  Converts a multicast IP address to a multicast HW MAC address.
  
  This function converts a multicast IP address to a multicast HW MAC address 
  for all packet transactions. If the mapping is accepted, then EFI_SUCCESS will
  be returned.

  @param This A pointer to the EFI_SIMPLE_NETWORK_PROTOCOL instance.
  @param IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460].
              Set to FALSE if the multicast IP address is IPv4 [RFC 791]. 
  @param IP   The multicast IP address that is to be converted to a multicast 
              HW MAC address.
  @param MAC  The multicast HW MAC address that is to be generated from IP.

  @retval EFI_SUCCESS           The multicast IP address was mapped to the
                                multicast HW MAC address.
  @retval EFI_NOT_STARTED       The Simple Network Protocol interface has not 
                                been started by calling Start().
  @retval EFI_INVALID_PARAMETER IP is NULL.
  @retval EFI_INVALID_PARAMETER MAC is NULL.
  @retval EFI_INVALID_PARAMETER IP does not point to a valid IPv4 or IPv6 
                                multicast address.
  @retval EFI_DEVICE_ERROR      The Simple Network Protocol interface has not 
                                been initialized by calling Initialize().
  @retval EFI_UNSUPPORTED       IPv6 is TRUE and the implementation does not 
                                support IPv6 multicast to MAC address conversion.

**/
EFI_STATUS
EFIAPI
SnpUndi32McastIpToMac (
  IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
  IN BOOLEAN                     IPv6,
  IN EFI_IP_ADDRESS              *IP,
  OUT EFI_MAC_ADDRESS            *MAC
  )
{
  SNP_DRIVER  *Snp;
  EFI_TPL     OldTpl;
  EFI_STATUS  Status;

  //
  // Get pointer to SNP driver instance for *this.
  //
  if (This == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  if (IP == NULL || MAC == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (This);

  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);

  switch (Snp->Mode.State) {
  case EfiSimpleNetworkInitialized:
    break;

  case EfiSimpleNetworkStopped:
    Status = EFI_NOT_STARTED;
    goto ON_EXIT;

  default:
    Status = EFI_DEVICE_ERROR;
    goto ON_EXIT;
  }

  Status = PxeIp2Mac (Snp, IPv6, IP, MAC);

ON_EXIT:
  gBS->RestoreTPL (OldTpl);

  return Status;
}