/** @file
  The implementation for Shell command IfConfig6.

  Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
  (C) Copyright 2017 Hewlett Packard Enterprise Development LP<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/
#include "UefiShellNetwork2CommandsLib.h"

enum {
  IfConfig6OpList  = 1,
  IfConfig6OpSet   = 2,
  IfConfig6OpClear = 3
};

typedef enum {
  VarCheckReserved = -1,
  VarCheckOk       = 0,
  VarCheckDuplicate,
  VarCheckConflict,
  VarCheckUnknown,
  VarCheckLackValue,
  VarCheckOutOfMem
} VAR_CHECK_CODE;

typedef enum {
  FlagTypeSingle = 0,
  FlagTypeNeedVar,
  FlagTypeNeedSet,
  FlagTypeSkipUnknown
} VAR_CHECK_FLAG_TYPE;

#define MACADDRMAXSIZE  32
#define PREFIXMAXLEN    16

typedef struct _IFCONFIG6_INTERFACE_CB {
  EFI_HANDLE                                  NicHandle;
  LIST_ENTRY                                  Link;
  EFI_IP6_CONFIG_PROTOCOL                     *IfCfg;
  EFI_IP6_CONFIG_INTERFACE_INFO               *IfInfo;
  EFI_IP6_CONFIG_INTERFACE_ID                 *IfId;
  EFI_IP6_CONFIG_POLICY                       Policy;
  EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS    Xmits;
  UINT32                                      DnsCnt;
  EFI_IPv6_ADDRESS                            DnsAddr[1];
} IFCONFIG6_INTERFACE_CB;

typedef struct _ARG_LIST ARG_LIST;

struct _ARG_LIST {
  ARG_LIST    *Next;
  CHAR16      *Arg;
};

typedef struct _IFCONFIG6_PRIVATE_DATA {
  EFI_HANDLE    ImageHandle;
  LIST_ENTRY    IfList;

  UINT32        OpCode;
  CHAR16        *IfName;
  ARG_LIST      *VarArg;
} IFCONFIG6_PRIVATE_DATA;

typedef struct _VAR_CHECK_ITEM {
  CHAR16                 *FlagStr;
  UINT32                 FlagID;
  UINT32                 ConflictMask;
  VAR_CHECK_FLAG_TYPE    FlagType;
} VAR_CHECK_ITEM;

SHELL_PARAM_ITEM  mIfConfig6CheckList[] = {
  {
    L"-b",
    TypeFlag
  },
  {
    L"-s",
    TypeMaxValue
  },
  {
    L"-l",
    TypeValue
  },
  {
    L"-r",
    TypeValue
  },
  {
    L"-?",
    TypeFlag
  },
  {
    NULL,
    TypeMax
  },
};

VAR_CHECK_ITEM  mIfConfig6SetCheckList[] = {
  {
    L"auto",
    0x00000001,
    0x00000001,
    FlagTypeSingle
  },
  {
    L"man",
    0x00000002,
    0x00000001,
    FlagTypeSingle
  },
  {
    L"host",
    0x00000004,
    0x00000002,
    FlagTypeSingle
  },
  {
    L"dad",
    0x00000008,
    0x00000004,
    FlagTypeSingle
  },
  {
    L"gw",
    0x00000010,
    0x00000008,
    FlagTypeSingle
  },
  {
    L"dns",
    0x00000020,
    0x00000010,
    FlagTypeSingle
  },
  {
    L"id",
    0x00000040,
    0x00000020,
    FlagTypeSingle
  },
  {
    NULL,
    0x0,
    0x0,
    FlagTypeSkipUnknown
  },
};

/**
  Free the ARG_LIST.

  @param List Pointer to ARG_LIST to free.
**/
VOID
IfConfig6FreeArgList (
  ARG_LIST  *List
  )
{
  ARG_LIST  *Next;

  while (List->Next != NULL) {
    Next = List->Next;
    FreePool (List);
    List = Next;
  }

  FreePool (List);
}

/**
  Split a string with specified separator and save the substring to a list.

  @param[in]    String       The pointer of the input string.
  @param[in]    Separator    The specified separator.

  @return The pointer of headnode of ARG_LIST.

**/
ARG_LIST *
IfConfig6SplitStrToList (
  IN CONST CHAR16  *String,
  IN CHAR16        Separator
  )
{
  CHAR16    *Str;
  CHAR16    *ArgStr;
  ARG_LIST  *ArgList;
  ARG_LIST  *ArgNode;

  if ((String == NULL) || (*String == L'\0')) {
    return NULL;
  }

  //
  // Copy the CONST string to a local copy.
  //
  Str = AllocateCopyPool (StrSize (String), String);
  if (Str == NULL) {
    return NULL;
  }

  ArgStr = Str;

  //
  // init a node for the list head.
  //
  ArgNode = (ARG_LIST *)AllocateZeroPool (sizeof (ARG_LIST));
  if (ArgNode == NULL) {
    return NULL;
  }

  ArgList = ArgNode;

  //
  // Split the local copy and save in the list node.
  //
  while (*Str != L'\0') {
    if (*Str == Separator) {
      *Str          = L'\0';
      ArgNode->Arg  = ArgStr;
      ArgStr        = Str + 1;
      ArgNode->Next = (ARG_LIST *)AllocateZeroPool (sizeof (ARG_LIST));
      if (ArgNode->Next == NULL) {
        //
        // Free the local copy of string stored in the first node
        //
        FreePool (ArgList->Arg);
        IfConfig6FreeArgList (ArgList);
        return NULL;
      }

      ArgNode = ArgNode->Next;
    }

    Str++;
  }

  ArgNode->Arg  = ArgStr;
  ArgNode->Next = NULL;

  return ArgList;
}

/**
  Check the correctness of input Args with '-s' option.

  @param[in]    CheckList    The pointer of VAR_CHECK_ITEM array.
  @param[in]    Name         The pointer of input arg.
  @param[in]    Init         The switch to execute the check.

  @return The value of VAR_CHECK_CODE.

**/
VAR_CHECK_CODE
IfConfig6RetriveCheckListByName (
  IN VAR_CHECK_ITEM  *CheckList,
  IN CHAR16          *Name,
  IN BOOLEAN         Init
  )
{
  STATIC UINT32   CheckDuplicate;
  STATIC UINT32   CheckConflict;
  VAR_CHECK_CODE  RtCode;
  UINT32          Index;
  VAR_CHECK_ITEM  Arg;

  if (Init) {
    CheckDuplicate = 0;
    CheckConflict  = 0;
    return VarCheckOk;
  }

  RtCode = VarCheckOk;
  Index  = 0;
  Arg    = CheckList[Index];

  //
  // Check the Duplicated/Conflicted/Unknown input Args.
  //
  while (Arg.FlagStr != NULL) {
    if (StrCmp (Arg.FlagStr, Name) == 0) {
      if (CheckDuplicate & Arg.FlagID) {
        RtCode = VarCheckDuplicate;
        break;
      }

      if (CheckConflict & Arg.ConflictMask) {
        RtCode = VarCheckConflict;
        break;
      }

      CheckDuplicate |= Arg.FlagID;
      CheckConflict  |= Arg.ConflictMask;
      break;
    }

    Arg = CheckList[++Index];
  }

  if (Arg.FlagStr == NULL) {
    RtCode = VarCheckUnknown;
  }

  return RtCode;
}

/**
  The notify function of create event when performing a manual config.

  @param[in]    Event        The event this notify function registered to.
  @param[in]    Context      Pointer to the context data registered to the event.

**/
VOID
EFIAPI
IfConfig6ManualAddressNotify (
  IN EFI_EVENT  Event,
  IN VOID       *Context
  )
{
  *((BOOLEAN *)Context) = TRUE;
}

/**
  Print MAC address.

  @param[in]    Node    The pointer of MAC address buffer.
  @param[in]    Size    The size of MAC address buffer.

**/
VOID
IfConfig6PrintMacAddr (
  IN UINT8   *Node,
  IN UINT32  Size
  )
{
  UINTN  Index;

  ASSERT (Size <= MACADDRMAXSIZE);

  for (Index = 0; Index < Size; Index++) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_MAC_ADDR_BODY), gShellNetwork2HiiHandle, Node[Index]);
    if (Index + 1 < Size) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_COLON), gShellNetwork2HiiHandle);
    }
  }

  ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_NEWLINE), gShellNetwork2HiiHandle);
}

/**
  Print IPv6 address.

  @param[in]    Ip           The pointer of Ip bufffer in EFI_IPv6_ADDRESS format.
  @param[in]    PrefixLen    The pointer of PrefixLen that describes the size Prefix.

**/
VOID
IfConfig6PrintIpAddr (
  IN EFI_IPv6_ADDRESS  *Ip,
  IN UINT8             *PrefixLen
  )
{
  UINTN    Index;
  BOOLEAN  Short;

  Short = FALSE;

  for (Index = 0; Index < PREFIXMAXLEN; Index = Index + 2) {
    if (!Short && (Index + 1 < PREFIXMAXLEN) && (Index % 2 == 0) && (Ip->Addr[Index] == 0) && (Ip->Addr[Index + 1] == 0)) {
      //
      // Deal with the case of ::.
      //
      if (Index == 0) {
        //
        // :: is at the beginning of the address.
        //
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_COLON), gShellNetwork2HiiHandle);
      }

      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_COLON), gShellNetwork2HiiHandle);

      while ((Index < PREFIXMAXLEN) && (Ip->Addr[Index] == 0) && (Ip->Addr[Index + 1] == 0)) {
        Index = Index + 2;
        if (Index > PREFIXMAXLEN - 2) {
          break;
        }
      }

      Short = TRUE;

      if (Index == PREFIXMAXLEN) {
        //
        // :: is at the end of the address.
        //
        break;
      }
    }

    if (Index < PREFIXMAXLEN - 1) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_IP_ADDR_BODY), gShellNetwork2HiiHandle, Ip->Addr[Index]);
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_IP_ADDR_BODY), gShellNetwork2HiiHandle, Ip->Addr[Index + 1]);
    }

    if (Index + 2 < PREFIXMAXLEN) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_COLON), gShellNetwork2HiiHandle);
    }
  }

  if (PrefixLen != NULL) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_PREFIX_LEN), gShellNetwork2HiiHandle, *PrefixLen);
  }
}

/**
  Pick up host IPv6 address in string format from Args with "-s" option and convert it to EFI_IP6_CONFIG_MANUAL_ADDRESS format.

  @param[in, out]    Arg        The pointer of the address of ARG_LIST which save Args with the "-s" option.
  @param[out]        Buf        The pointer of the address of EFI_IP6_CONFIG_MANUAL_ADDRESS.
  @param[out]        BufSize    The pointer of BufSize that describes the size of Buf in bytes.

  @retval EFI_SUCCESS    The convertion is successful.
  @retval Others         Does't find the host address, or it is an invalid IPv6 address in string format.

**/
EFI_STATUS
IfConfig6ParseManualAddressList (
  IN OUT ARG_LIST                    **Arg,
  OUT EFI_IP6_CONFIG_MANUAL_ADDRESS  **Buf,
  OUT UINTN                          *BufSize
  )
{
  EFI_STATUS                     Status;
  EFI_IP6_CONFIG_MANUAL_ADDRESS  *AddrBuf;
  ARG_LIST                       *VarArg;
  EFI_IPv6_ADDRESS               Address;
  UINT8                          Prefix;
  UINT8                          AddrCnt;

  Prefix   = 0;
  AddrCnt  = 0;
  *BufSize = 0;
  *Buf     = NULL;
  VarArg   = *Arg;
  Status   = EFI_SUCCESS;

  //
  // Go through the list to check the correctness of input host ip6 address.
  //
  while ((!EFI_ERROR (Status)) && (VarArg != NULL)) {
    Status = NetLibStrToIp6andPrefix (VarArg->Arg, &Address, &Prefix);

    if (EFI_ERROR (Status)) {
      //
      // host ip ip ... gw
      //
      break;
    }

    VarArg = VarArg->Next;
    AddrCnt++;
  }

  if (AddrCnt == 0) {
    return EFI_INVALID_PARAMETER;
  }

  AddrBuf = AllocateZeroPool (AddrCnt * sizeof (EFI_IP6_CONFIG_MANUAL_ADDRESS));
  ASSERT (AddrBuf != NULL);

  AddrCnt = 0;
  VarArg  = *Arg;
  Status  = EFI_SUCCESS;

  //
  // Go through the list to fill in the EFI_IP6_CONFIG_MANUAL_ADDRESS structure.
  //
  while ((!EFI_ERROR (Status)) && (VarArg != NULL)) {
    Status = NetLibStrToIp6andPrefix (VarArg->Arg, &Address, &Prefix);

    if (EFI_ERROR (Status)) {
      break;
    }

    //
    // If prefix length is not set, set it as Zero here. In the IfConfigSetInterfaceInfo()
    // Zero prefix, length will be transfered to default prefix length.
    //
    if (Prefix == 0xFF) {
      Prefix = 0;
    }

    AddrBuf[AddrCnt].IsAnycast    = FALSE;
    AddrBuf[AddrCnt].PrefixLength = Prefix;
    IP6_COPY_ADDRESS (&AddrBuf[AddrCnt].Address, &Address);
    VarArg = VarArg->Next;
    AddrCnt++;
  }

  *Arg = VarArg;

  if (EFI_ERROR (Status) && (Status != EFI_INVALID_PARAMETER)) {
    goto ON_ERROR;
  }

  *Buf     = AddrBuf;
  *BufSize = AddrCnt * sizeof (EFI_IP6_CONFIG_MANUAL_ADDRESS);

  return EFI_SUCCESS;

ON_ERROR:

  FreePool (AddrBuf);
  return Status;
}

/**
  Pick up gw/dns IPv6 address in string format from Args with "-s" option and convert it to EFI_IPv6_ADDRESS format.

  @param[in, out]    Arg        The pointer of the address of ARG_LIST that save Args with the "-s" option.
  @param[out]        Buf        The pointer of the address of EFI_IPv6_ADDRESS.
  @param[out]        BufSize    The pointer of BufSize that describes the size of Buf in bytes.

  @retval EFI_SUCCESS    The conversion is successful.
  @retval Others         Doesn't find the host address, or it is an invalid IPv6 address in string format.

**/
EFI_STATUS
IfConfig6ParseGwDnsAddressList (
  IN OUT ARG_LIST       **Arg,
  OUT EFI_IPv6_ADDRESS  **Buf,
  OUT UINTN             *BufSize
  )
{
  EFI_STATUS        Status;
  EFI_IPv6_ADDRESS  *AddrBuf;
  ARG_LIST          *VarArg;
  EFI_IPv6_ADDRESS  Address;
  UINT8             Prefix;
  UINT8             AddrCnt;

  AddrCnt  = 0;
  *BufSize = 0;
  *Buf     = NULL;
  VarArg   = *Arg;
  Status   = EFI_SUCCESS;

  //
  // Go through the list to check the correctness of input gw/dns address.
  //
  while ((!EFI_ERROR (Status)) && (VarArg != NULL)) {
    Status = NetLibStrToIp6andPrefix (VarArg->Arg, &Address, &Prefix);

    if (EFI_ERROR (Status)) {
      //
      // gw ip ip ... host
      //
      break;
    }

    VarArg = VarArg->Next;
    AddrCnt++;
  }

  if (AddrCnt == 0) {
    return EFI_INVALID_PARAMETER;
  }

  AddrBuf = AllocateZeroPool (AddrCnt * sizeof (EFI_IPv6_ADDRESS));
  ASSERT (AddrBuf != NULL);

  AddrCnt = 0;
  VarArg  = *Arg;
  Status  = EFI_SUCCESS;

  //
  // Go through the list to fill in the EFI_IPv6_ADDRESS structure.
  //
  while ((!EFI_ERROR (Status)) && (VarArg != NULL)) {
    Status = NetLibStrToIp6andPrefix (VarArg->Arg, &Address, &Prefix);

    if (EFI_ERROR (Status)) {
      break;
    }

    IP6_COPY_ADDRESS (&AddrBuf[AddrCnt], &Address);

    VarArg = VarArg->Next;
    AddrCnt++;
  }

  *Arg = VarArg;

  if (EFI_ERROR (Status) && (Status != EFI_INVALID_PARAMETER)) {
    goto ON_ERROR;
  }

  *Buf     = AddrBuf;
  *BufSize = AddrCnt * sizeof (EFI_IPv6_ADDRESS);

  return EFI_SUCCESS;

ON_ERROR:

  FreePool (AddrBuf);
  return Status;
}

/**
  Parse InterfaceId in string format from Args with the "-s" option and convert it to EFI_IP6_CONFIG_INTERFACE_ID format.

  @param[in, out]   Arg     The pointer of the address of ARG_LIST that saves Args with the "-s" option.
  @param[out]       IfId    The pointer of EFI_IP6_CONFIG_INTERFACE_ID.

  @retval EFI_SUCCESS              The get status processed successfullly.
  @retval EFI_INVALID_PARAMETER    The get status process failed.

**/
EFI_STATUS
IfConfig6ParseInterfaceId (
  IN OUT ARG_LIST                  **Arg,
  OUT EFI_IP6_CONFIG_INTERFACE_ID  **IfId
  )
{
  UINT8   Index;
  UINT8   NodeVal;
  CHAR16  *IdStr;

  if (*Arg == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Index = 0;
  IdStr = (*Arg)->Arg;
  ASSERT (IfId != NULL);
  *IfId = AllocateZeroPool (sizeof (EFI_IP6_CONFIG_INTERFACE_ID));
  ASSERT (*IfId != NULL);

  while ((*IdStr != L'\0') && (Index < 8)) {
    NodeVal = 0;
    while ((*IdStr != L':') && (*IdStr != L'\0')) {
      if ((*IdStr <= L'F') && (*IdStr >= L'A')) {
        NodeVal = (UINT8)((NodeVal << 4) + *IdStr - L'A' + 10);
      } else if ((*IdStr <= L'f') && (*IdStr >= L'a')) {
        NodeVal = (UINT8)((NodeVal << 4) + *IdStr - L'a' + 10);
      } else if ((*IdStr <= L'9') && (*IdStr >= L'0')) {
        NodeVal = (UINT8)((NodeVal << 4) + *IdStr - L'0');
      } else {
        FreePool (*IfId);
        return EFI_INVALID_PARAMETER;
      }

      IdStr++;
    }

    (*IfId)->Id[Index++] = NodeVal;

    if (*IdStr == L':') {
      IdStr++;
    }
  }

  *Arg = (*Arg)->Next;
  return EFI_SUCCESS;
}

/**
  Parse dad in string format from Args with the "-s" option and convert it to UINT32 format.

  @param[in, out]   Arg      The pointer of the address of ARG_LIST that saves Args with the "-s" option.
  @param[out]       Xmits    The pointer of Xmits.

  @retval EFI_SUCCESS    The get status processed successfully.
  @retval others         The get status process failed.

**/
EFI_STATUS
IfConfig6ParseDadXmits (
  IN OUT ARG_LIST  **Arg,
  OUT UINT32       *Xmits
  )
{
  CHAR16  *ValStr;

  if (*Arg == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  ValStr = (*Arg)->Arg;
  *Xmits = 0;

  while (*ValStr != L'\0') {
    if ((*ValStr <= L'9') && (*ValStr >= L'0')) {
      *Xmits = (*Xmits * 10) + (*ValStr - L'0');
    } else {
      return EFI_INVALID_PARAMETER;
    }

    ValStr++;
  }

  *Arg = (*Arg)->Next;
  return EFI_SUCCESS;
}

/**
  The get current status of all handles.

  @param[in]   ImageHandle    The handle of  ImageHandle.
  @param[in]   IfName         The pointer of  IfName(interface name).
  @param[in]   IfList         The pointer of  IfList(interface list).

  @retval EFI_SUCCESS    The get status processed successfully.
  @retval others         The get status process failed.

**/
EFI_STATUS
IfConfig6GetInterfaceInfo (
  IN EFI_HANDLE  ImageHandle,
  IN CHAR16      *IfName,
  IN LIST_ENTRY  *IfList
  )
{
  EFI_STATUS                     Status;
  UINTN                          HandleIndex;
  UINTN                          HandleNum;
  EFI_HANDLE                     *HandleBuffer;
  EFI_IP6_CONFIG_PROTOCOL        *Ip6Cfg;
  EFI_IP6_CONFIG_INTERFACE_INFO  *IfInfo;
  IFCONFIG6_INTERFACE_CB         *IfCb;
  UINTN                          DataSize;

  HandleBuffer = NULL;
  HandleNum    = 0;

  IfInfo = NULL;
  IfCb   = NULL;

  //
  // Locate all the handles with ip6 service binding protocol.
  //
  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  &gEfiIp6ServiceBindingProtocolGuid,
                  NULL,
                  &HandleNum,
                  &HandleBuffer
                  );
  if (EFI_ERROR (Status) || (HandleNum == 0)) {
    return Status;
  }

  //
  // Enumerate all handles that installed with ip6 service binding protocol.
  //
  for (HandleIndex = 0; HandleIndex < HandleNum; HandleIndex++) {
    IfCb     = NULL;
    IfInfo   = NULL;
    DataSize = 0;

    //
    // Ip6config protocol and ip6 service binding protocol are installed
    // on the same handle.
    //
    ASSERT (HandleBuffer != NULL);
    Status = gBS->HandleProtocol (
                    HandleBuffer[HandleIndex],
                    &gEfiIp6ConfigProtocolGuid,
                    (VOID **)&Ip6Cfg
                    );

    if (EFI_ERROR (Status)) {
      goto ON_ERROR;
    }

    //
    // Get the interface information size.
    //
    Status = Ip6Cfg->GetData (
                       Ip6Cfg,
                       Ip6ConfigDataTypeInterfaceInfo,
                       &DataSize,
                       NULL
                       );

    if (Status != EFI_BUFFER_TOO_SMALL) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
      goto ON_ERROR;
    }

    IfInfo = AllocateZeroPool (DataSize);

    if (IfInfo == NULL) {
      Status = EFI_OUT_OF_RESOURCES;
      goto ON_ERROR;
    }

    //
    // Get the interface info.
    //
    Status = Ip6Cfg->GetData (
                       Ip6Cfg,
                       Ip6ConfigDataTypeInterfaceInfo,
                       &DataSize,
                       IfInfo
                       );

    if (EFI_ERROR (Status)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
      goto ON_ERROR;
    }

    //
    // Check the interface name if required.
    //
    if ((IfName != NULL) && (StrCmp (IfName, IfInfo->Name) != 0)) {
      FreePool (IfInfo);
      continue;
    }

    DataSize = 0;
    //
    // Get the size of dns server list.
    //
    Status = Ip6Cfg->GetData (
                       Ip6Cfg,
                       Ip6ConfigDataTypeDnsServer,
                       &DataSize,
                       NULL
                       );

    if ((Status != EFI_BUFFER_TOO_SMALL) && (Status != EFI_NOT_FOUND)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
      goto ON_ERROR;
    }

    IfCb = AllocateZeroPool (sizeof (IFCONFIG6_INTERFACE_CB) + DataSize);

    if (IfCb == NULL) {
      Status = EFI_OUT_OF_RESOURCES;
      goto ON_ERROR;
    }

    IfCb->NicHandle = HandleBuffer[HandleIndex];
    IfCb->IfInfo    = IfInfo;
    IfCb->IfCfg     = Ip6Cfg;
    IfCb->DnsCnt    = (UINT32)(DataSize / sizeof (EFI_IPv6_ADDRESS));

    //
    // Get the dns server list if has.
    //
    if (DataSize > 0) {
      Status = Ip6Cfg->GetData (
                         Ip6Cfg,
                         Ip6ConfigDataTypeDnsServer,
                         &DataSize,
                         IfCb->DnsAddr
                         );

      if (EFI_ERROR (Status)) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
        goto ON_ERROR;
      }
    }

    //
    // Get the interface id if has.
    //
    DataSize   = sizeof (EFI_IP6_CONFIG_INTERFACE_ID);
    IfCb->IfId = AllocateZeroPool (DataSize);

    if (IfCb->IfId == NULL) {
      goto ON_ERROR;
    }

    Status = Ip6Cfg->GetData (
                       Ip6Cfg,
                       Ip6ConfigDataTypeAltInterfaceId,
                       &DataSize,
                       IfCb->IfId
                       );

    if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
      goto ON_ERROR;
    }

    if (Status == EFI_NOT_FOUND) {
      FreePool (IfCb->IfId);
      IfCb->IfId = NULL;
    }

    //
    // Get the config policy.
    //
    DataSize = sizeof (EFI_IP6_CONFIG_POLICY);
    Status   = Ip6Cfg->GetData (
                         Ip6Cfg,
                         Ip6ConfigDataTypePolicy,
                         &DataSize,
                         &IfCb->Policy
                         );

    if (EFI_ERROR (Status)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
      goto ON_ERROR;
    }

    //
    // Get the dad transmits.
    //
    DataSize = sizeof (EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS);
    Status   = Ip6Cfg->GetData (
                         Ip6Cfg,
                         Ip6ConfigDataTypeDupAddrDetectTransmits,
                         &DataSize,
                         &IfCb->Xmits
                         );

    if (EFI_ERROR (Status)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
      goto ON_ERROR;
    }

    InsertTailList (IfList, &IfCb->Link);

    if ((IfName != NULL) && (StrCmp (IfName, IfInfo->Name) == 0)) {
      //
      // Only need the appointed interface, keep the allocated buffer.
      //
      IfCb   = NULL;
      IfInfo = NULL;
      break;
    }
  }

  if (HandleBuffer != NULL) {
    FreePool (HandleBuffer);
  }

  return EFI_SUCCESS;

ON_ERROR:

  if (IfInfo != NULL) {
    FreePool (IfInfo);
  }

  if (IfCb != NULL) {
    if (IfCb->IfId != NULL) {
      FreePool (IfCb->IfId);
    }

    FreePool (IfCb);
  }

  return Status;
}

/**
  The list process of the IfConfig6 application.

  @param[in]   IfList    The pointer of IfList(interface list).

  @retval SHELL_SUCCESS  The IfConfig6 list processed successfully.
  @retval others         The IfConfig6 list process failed.

**/
SHELL_STATUS
IfConfig6ShowInterfaceInfo (
  IN LIST_ENTRY  *IfList
  )
{
  LIST_ENTRY              *Entry;
  IFCONFIG6_INTERFACE_CB  *IfCb;
  UINTN                   Index;

  Entry = IfList->ForwardLink;

  if (IsListEmpty (IfList)) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_INTERFACE), gShellNetwork2HiiHandle);
  }

  //
  // Go through the interface list.
  //
  while (Entry != IfList) {
    IfCb = BASE_CR (Entry, IFCONFIG6_INTERFACE_CB, Link);

    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_BREAK), gShellNetwork2HiiHandle);

    //
    // Print interface name.
    //
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_IF_NAME), gShellNetwork2HiiHandle, IfCb->IfInfo->Name);

    //
    // Print interface config policy.
    //
    if (IfCb->Policy == Ip6ConfigPolicyAutomatic) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_POLICY_AUTO), gShellNetwork2HiiHandle);
    } else {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_POLICY_MAN), gShellNetwork2HiiHandle);
    }

    //
    // Print dad transmit.
    //
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_DAD_TRANSMITS), gShellNetwork2HiiHandle, IfCb->Xmits);

    //
    // Print interface id if has.
    //
    if (IfCb->IfId != NULL) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_INTERFACE_ID_HEAD), gShellNetwork2HiiHandle);

      IfConfig6PrintMacAddr (
        IfCb->IfId->Id,
        8
        );
    }

    //
    // Print mac address of the interface.
    //
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_MAC_ADDR_HEAD), gShellNetwork2HiiHandle);

    IfConfig6PrintMacAddr (
      IfCb->IfInfo->HwAddress.Addr,
      IfCb->IfInfo->HwAddressSize
      );

    //
    // Print ip addresses list of the interface.
    //
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_IP_ADDR_HEAD), gShellNetwork2HiiHandle);

    for (Index = 0; Index < IfCb->IfInfo->AddressInfoCount; Index++) {
      IfConfig6PrintIpAddr (
        &IfCb->IfInfo->AddressInfo[Index].Address,
        &IfCb->IfInfo->AddressInfo[Index].PrefixLength
        );
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_NEWLINE), gShellNetwork2HiiHandle);
    }

    //
    // Print dns server addresses list of the interface if has.
    //
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_DNS_ADDR_HEAD), gShellNetwork2HiiHandle);

    for (Index = 0; Index < IfCb->DnsCnt; Index++) {
      IfConfig6PrintIpAddr (
        &IfCb->DnsAddr[Index],
        NULL
        );
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_NEWLINE), gShellNetwork2HiiHandle);
    }

    //
    // Print route table of the interface if has.
    //
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_ROUTE_HEAD), gShellNetwork2HiiHandle);

    for (Index = 0; Index < IfCb->IfInfo->RouteCount; Index++) {
      IfConfig6PrintIpAddr (
        &IfCb->IfInfo->RouteTable[Index].Destination,
        &IfCb->IfInfo->RouteTable[Index].PrefixLength
        );
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_JOINT), gShellNetwork2HiiHandle);

      IfConfig6PrintIpAddr (
        &IfCb->IfInfo->RouteTable[Index].Gateway,
        NULL
        );
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_NEWLINE), gShellNetwork2HiiHandle);
    }

    Entry = Entry->ForwardLink;
  }

  ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_BREAK), gShellNetwork2HiiHandle);
  ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_NEWLINE), gShellNetwork2HiiHandle);

  return SHELL_SUCCESS;
}

/**
  The clean process of the IfConfig6 application.

  @param[in]   IfList    The pointer of IfList(interface list).
  @param[in]   IfName    The pointer of interface name.

  @retval SHELL_SUCCESS  The IfConfig6 clean processed successfully.
  @retval others         The IfConfig6 clean process failed.

**/
SHELL_STATUS
IfConfig6ClearInterfaceInfo (
  IN LIST_ENTRY  *IfList,
  IN CHAR16      *IfName
  )
{
  EFI_STATUS              Status;
  SHELL_STATUS            ShellStatus;
  LIST_ENTRY              *Entry;
  IFCONFIG6_INTERFACE_CB  *IfCb;
  EFI_IP6_CONFIG_POLICY   Policy;

  Entry       = IfList->ForwardLink;
  Status      = EFI_SUCCESS;
  ShellStatus = SHELL_SUCCESS;

  if (IsListEmpty (IfList)) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_INTERFACE), gShellNetwork2HiiHandle);
  }

  //
  // Go through the interface list.If the interface name is specified, then
  // need to refresh the configuration.
  //
  while (Entry != IfList) {
    IfCb = BASE_CR (Entry, IFCONFIG6_INTERFACE_CB, Link);

    if ((IfName != NULL) && (StrCmp (IfName, IfCb->IfInfo->Name) == 0)) {
      Policy = Ip6ConfigPolicyManual;

      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypePolicy,
                              sizeof (EFI_IP6_CONFIG_POLICY),
                              &Policy
                              );
      if (EFI_ERROR (Status)) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_ERR_AD), gShellNetwork2HiiHandle, L"ifconfig6");
        ShellStatus = SHELL_ACCESS_DENIED;
        break;
      }
    }

    Policy = Ip6ConfigPolicyAutomatic;

    Status = IfCb->IfCfg->SetData (
                            IfCb->IfCfg,
                            Ip6ConfigDataTypePolicy,
                            sizeof (EFI_IP6_CONFIG_POLICY),
                            &Policy
                            );

    if (EFI_ERROR (Status)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_ERR_AD), gShellNetwork2HiiHandle, L"ifconfig6");
      ShellStatus = SHELL_ACCESS_DENIED;
      break;
    }

    Entry = Entry->ForwardLink;
  }

  return ShellStatus;
}

/**
  The set process of the IfConfig6 application.

  @param[in]   IfList    The pointer of IfList(interface list).
  @param[in]   VarArg    The pointer of ARG_LIST(Args with "-s" option).

  @retval SHELL_SUCCESS  The IfConfig6 set processed successfully.
  @retval others         The IfConfig6 set process failed.

**/
SHELL_STATUS
IfConfig6SetInterfaceInfo (
  IN LIST_ENTRY  *IfList,
  IN ARG_LIST    *VarArg
  )
{
  EFI_STATUS                     Status;
  SHELL_STATUS                   ShellStatus;
  IFCONFIG6_INTERFACE_CB         *IfCb;
  EFI_IP6_CONFIG_MANUAL_ADDRESS  *CfgManAddr;
  EFI_IPv6_ADDRESS               *CfgAddr;
  UINTN                          AddrSize;
  EFI_IP6_CONFIG_INTERFACE_ID    *InterfaceId;
  UINT32                         DadXmits;
  UINT32                         CurDadXmits;
  UINTN                          CurDadXmitsLen;
  EFI_IP6_CONFIG_POLICY          Policy;

  VAR_CHECK_CODE  CheckCode;
  EFI_EVENT       TimeOutEvt;
  EFI_EVENT       MappedEvt;
  BOOLEAN         IsAddressOk;

  UINTN                          DataSize;
  UINT32                         Index;
  UINT32                         Index2;
  BOOLEAN                        IsAddressSet;
  EFI_IP6_CONFIG_INTERFACE_INFO  *IfInfo;

  CfgManAddr  = NULL;
  CfgAddr     = NULL;
  TimeOutEvt  = NULL;
  MappedEvt   = NULL;
  IfInfo      = NULL;
  InterfaceId = NULL;
  CurDadXmits = 0;

  if (IsListEmpty (IfList)) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_INTERFACE), gShellNetwork2HiiHandle);
    return SHELL_INVALID_PARAMETER;
  }

  //
  // Make sure to set only one interface each time.
  //
  IfCb        = BASE_CR (IfList->ForwardLink, IFCONFIG6_INTERFACE_CB, Link);
  Status      = EFI_SUCCESS;
  ShellStatus = SHELL_SUCCESS;

  //
  // Initialize check list mechanism.
  //
  CheckCode = IfConfig6RetriveCheckListByName (
                NULL,
                NULL,
                TRUE
                );

  //
  // Create events & timers for asynchronous settings.
  //
  Status = gBS->CreateEvent (
                  EVT_TIMER,
                  TPL_CALLBACK,
                  NULL,
                  NULL,
                  &TimeOutEvt
                  );
  if (EFI_ERROR (Status)) {
    ShellStatus = SHELL_ACCESS_DENIED;
    goto ON_EXIT;
  }

  Status = gBS->CreateEvent (
                  EVT_NOTIFY_SIGNAL,
                  TPL_NOTIFY,
                  IfConfig6ManualAddressNotify,
                  &IsAddressOk,
                  &MappedEvt
                  );
  if (EFI_ERROR (Status)) {
    ShellStatus = SHELL_ACCESS_DENIED;
    goto ON_EXIT;
  }

  //
  // Parse the setting variables.
  //
  while (VarArg != NULL) {
    //
    // Check invalid parameters (duplication & unknown & conflict).
    //
    CheckCode = IfConfig6RetriveCheckListByName (
                  mIfConfig6SetCheckList,
                  VarArg->Arg,
                  FALSE
                  );

    if (VarCheckOk != CheckCode) {
      switch (CheckCode) {
        case VarCheckDuplicate:
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_DUPLICATE_COMMAND), gShellNetwork2HiiHandle, VarArg->Arg);
          break;

        case VarCheckConflict:
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_CONFLICT_COMMAND), gShellNetwork2HiiHandle, VarArg->Arg);
          break;

        case VarCheckUnknown:
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_UNKNOWN_COMMAND), gShellNetwork2HiiHandle, VarArg->Arg);
          break;

        default:
          break;
      }

      VarArg = VarArg->Next;
      continue;
    }

    //
    // Process valid variables.
    //
    if (StrCmp (VarArg->Arg, L"auto") == 0) {
      //
      // Set automaic config policy
      //
      Policy = Ip6ConfigPolicyAutomatic;
      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypePolicy,
                              sizeof (EFI_IP6_CONFIG_POLICY),
                              &Policy
                              );

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      VarArg = VarArg->Next;

      if (VarArg != NULL) {
        if (StrCmp (VarArg->Arg, L"host") == 0) {
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_IP_CONFIG), gShellNetwork2HiiHandle, Status);
          ShellStatus = SHELL_INVALID_PARAMETER;
          goto ON_EXIT;
        } else if (StrCmp (VarArg->Arg, L"gw") == 0) {
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_GW_CONFIG), gShellNetwork2HiiHandle, Status);
          ShellStatus = SHELL_INVALID_PARAMETER;
          goto ON_EXIT;
        } else if (StrCmp (VarArg->Arg, L"dns") == 0) {
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_DNS_CONFIG), gShellNetwork2HiiHandle, Status);
          ShellStatus = SHELL_INVALID_PARAMETER;
          goto ON_EXIT;
        }
      }
    } else if (StrCmp (VarArg->Arg, L"man") == 0) {
      //
      // Set manual config policy.
      //
      Policy = Ip6ConfigPolicyManual;
      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypePolicy,
                              sizeof (EFI_IP6_CONFIG_POLICY),
                              &Policy
                              );

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      VarArg = VarArg->Next;
    } else if (StrCmp (VarArg->Arg, L"host") == 0) {
      //
      // Parse till the next tag or the end of command line.
      //
      VarArg = VarArg->Next;
      Status = IfConfig6ParseManualAddressList (
                 &VarArg,
                 &CfgManAddr,
                 &AddrSize
                 );

      if (EFI_ERROR (Status)) {
        if (Status == EFI_INVALID_PARAMETER) {
          ShellStatus = SHELL_INVALID_PARAMETER;
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_LACK_ARGUMENTS), gShellNetwork2HiiHandle, L"host");
          continue;
        } else {
          ShellStatus = SHELL_ACCESS_DENIED;
          goto ON_EXIT;
        }
      }

      //
      // Set static host ip6 address list.
      //   This is a asynchronous process.
      //
      IsAddressOk = FALSE;

      Status = IfCb->IfCfg->RegisterDataNotify (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeManualAddress,
                              MappedEvt
                              );
      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeManualAddress,
                              AddrSize,
                              CfgManAddr
                              );

      if (Status == EFI_NOT_READY) {
        //
        // Get current dad transmits count.
        //
        CurDadXmitsLen = sizeof (EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS);
        IfCb->IfCfg->GetData (
                       IfCb->IfCfg,
                       Ip6ConfigDataTypeDupAddrDetectTransmits,
                       &CurDadXmitsLen,
                       &CurDadXmits
                       );

        gBS->SetTimer (TimeOutEvt, TimerRelative, 50000000 + 10000000 * CurDadXmits);

        while (EFI_ERROR (gBS->CheckEvent (TimeOutEvt))) {
          if (IsAddressOk) {
            Status = EFI_SUCCESS;
            break;
          }
        }
      }

      IfCb->IfCfg->UnregisterDataNotify (
                     IfCb->IfCfg,
                     Ip6ConfigDataTypeManualAddress,
                     MappedEvt
                     );

      if (EFI_ERROR (Status)) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_MAN_HOST), gShellNetwork2HiiHandle, Status);
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      //
      // Check whether the address is set successfully.
      //
      DataSize = 0;

      Status = IfCb->IfCfg->GetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeInterfaceInfo,
                              &DataSize,
                              NULL
                              );

      if (Status != EFI_BUFFER_TOO_SMALL) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      IfInfo = AllocateZeroPool (DataSize);

      if (IfInfo == NULL) {
        ShellStatus = SHELL_OUT_OF_RESOURCES;
        goto ON_EXIT;
      }

      Status = IfCb->IfCfg->GetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeInterfaceInfo,
                              &DataSize,
                              IfInfo
                              );

      if (EFI_ERROR (Status)) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_IP6CFG_GETDATA), gShellNetwork2HiiHandle, Status);
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      for ( Index = 0; Index < (UINTN)(AddrSize / sizeof (EFI_IP6_CONFIG_MANUAL_ADDRESS)); Index++) {
        IsAddressSet = FALSE;
        //
        // By default, the prefix length 0 is regarded as 64.
        //
        if (CfgManAddr[Index].PrefixLength == 0) {
          CfgManAddr[Index].PrefixLength = 64;
        }

        for (Index2 = 0; Index2 < IfInfo->AddressInfoCount; Index2++) {
          if (EFI_IP6_EQUAL (&IfInfo->AddressInfo[Index2].Address, &CfgManAddr[Index].Address) &&
              (IfInfo->AddressInfo[Index2].PrefixLength == CfgManAddr[Index].PrefixLength))
          {
            IsAddressSet = TRUE;
            break;
          }
        }

        if (!IsAddressSet) {
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_ADDRESS_FAILED), gShellNetwork2HiiHandle);
          IfConfig6PrintIpAddr (
            &CfgManAddr[Index].Address,
            &CfgManAddr[Index].PrefixLength
            );
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_INFO_NEWLINE), gShellNetwork2HiiHandle);
        }
      }
    } else if (StrCmp (VarArg->Arg, L"gw") == 0) {
      //
      // Parse till the next tag or the end of command line.
      //
      VarArg = VarArg->Next;
      Status = IfConfig6ParseGwDnsAddressList (
                 &VarArg,
                 &CfgAddr,
                 &AddrSize
                 );

      if (EFI_ERROR (Status)) {
        if (Status == EFI_INVALID_PARAMETER) {
          ShellStatus = SHELL_INVALID_PARAMETER;
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_LACK_ARGUMENTS), gShellNetwork2HiiHandle, L"gw");
          continue;
        } else {
          ShellStatus = SHELL_ACCESS_DENIED;
          goto ON_EXIT;
        }
      }

      //
      // Set static gateway ip6 address list.
      //
      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeGateway,
                              AddrSize,
                              CfgAddr
                              );

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_MAN_GW), gShellNetwork2HiiHandle, Status);
        goto ON_EXIT;
      }
    } else if (StrCmp (VarArg->Arg, L"dns") == 0) {
      //
      // Parse till the next tag or the end of command line.
      //
      VarArg = VarArg->Next;
      Status = IfConfig6ParseGwDnsAddressList (
                 &VarArg,
                 &CfgAddr,
                 &AddrSize
                 );

      if (EFI_ERROR (Status)) {
        if (Status == EFI_INVALID_PARAMETER) {
          ShellStatus = SHELL_INVALID_PARAMETER;
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_LACK_ARGUMENTS), gShellNetwork2HiiHandle, L"dns");
          continue;
        } else {
          ShellStatus = SHELL_ACCESS_DENIED;
          goto ON_EXIT;
        }
      }

      //
      // Set static DNS server ip6 address list.
      //
      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeDnsServer,
                              AddrSize,
                              CfgAddr
                              );

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }
    } else if (StrCmp (VarArg->Arg, L"id") == 0) {
      //
      // Parse till the next tag or the end of command line.
      //
      VarArg = VarArg->Next;
      Status = IfConfig6ParseInterfaceId (&VarArg, &InterfaceId);

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_INVALID_PARAMETER;
        goto ON_EXIT;
      }

      //
      // Set alternative interface id.
      //
      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeAltInterfaceId,
                              sizeof (EFI_IP6_CONFIG_INTERFACE_ID),
                              InterfaceId
                              );

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }
    } else if (StrCmp (VarArg->Arg, L"dad") == 0) {
      //
      // Parse till the next tag or the end of command line.
      //
      VarArg = VarArg->Next;
      Status = IfConfig6ParseDadXmits (&VarArg, &DadXmits);

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }

      //
      // Set dad transmits count.
      //
      Status = IfCb->IfCfg->SetData (
                              IfCb->IfCfg,
                              Ip6ConfigDataTypeDupAddrDetectTransmits,
                              sizeof (EFI_IP6_CONFIG_DUP_ADDR_DETECT_TRANSMITS),
                              &DadXmits
                              );

      if (EFI_ERROR (Status)) {
        ShellStatus = SHELL_ACCESS_DENIED;
        goto ON_EXIT;
      }
    }
  }

ON_EXIT:

  if (CfgManAddr != NULL) {
    FreePool (CfgManAddr);
  }

  if (CfgAddr != NULL) {
    FreePool (CfgAddr);
  }

  if (MappedEvt != NULL) {
    gBS->CloseEvent (MappedEvt);
  }

  if (TimeOutEvt != NULL) {
    gBS->CloseEvent (TimeOutEvt);
  }

  if (IfInfo != NULL) {
    FreePool (IfInfo);
  }

  return ShellStatus;
}

/**
  The IfConfig6 main process.

  @param[in]   Private    The pointer of IFCONFIG6_PRIVATE_DATA.

  @retval SHELL_SUCCESS   IfConfig6 processed successfully.
  @retval others          The IfConfig6 process failed.

**/
SHELL_STATUS
IfConfig6 (
  IN IFCONFIG6_PRIVATE_DATA  *Private
  )
{
  EFI_STATUS    Status;
  SHELL_STATUS  ShellStatus;

  ShellStatus = SHELL_SUCCESS;

  //
  // Get configure information of all interfaces.
  //
  Status = IfConfig6GetInterfaceInfo (
             Private->ImageHandle,
             Private->IfName,
             &Private->IfList
             );

  if (EFI_ERROR (Status)) {
    ShellStatus = SHELL_NOT_FOUND;
    goto ON_EXIT;
  }

  switch (Private->OpCode) {
    case IfConfig6OpList:
      ShellStatus = IfConfig6ShowInterfaceInfo (&Private->IfList);
      break;

    case IfConfig6OpClear:
      ShellStatus = IfConfig6ClearInterfaceInfo (&Private->IfList, Private->IfName);
      break;

    case IfConfig6OpSet:
      ShellStatus = IfConfig6SetInterfaceInfo (&Private->IfList, Private->VarArg);
      break;

    default:
      ShellStatus = SHELL_UNSUPPORTED;
  }

ON_EXIT:

  return ShellStatus;
}

/**
  The IfConfig6 cleanup process, free the allocated memory.

  @param[in]   Private    The pointer of  IFCONFIG6_PRIVATE_DATA.

**/
VOID
IfConfig6Cleanup (
  IN IFCONFIG6_PRIVATE_DATA  *Private
  )
{
  LIST_ENTRY              *Entry;
  LIST_ENTRY              *NextEntry;
  IFCONFIG6_INTERFACE_CB  *IfCb;

  ASSERT (Private != NULL);

  //
  // Clean the list which save the set config Args.
  //
  if (Private->VarArg != NULL) {
    IfConfig6FreeArgList (Private->VarArg);
  }

  if (Private->IfName != NULL) {
    FreePool (Private->IfName);
  }

  //
  // Clean the IFCONFIG6_INTERFACE_CB list.
  //
  Entry     = Private->IfList.ForwardLink;
  NextEntry = Entry->ForwardLink;

  while (Entry != &Private->IfList) {
    IfCb = BASE_CR (Entry, IFCONFIG6_INTERFACE_CB, Link);

    RemoveEntryList (&IfCb->Link);

    if (IfCb->IfId != NULL) {
      FreePool (IfCb->IfId);
    }

    if (IfCb->IfInfo != NULL) {
      FreePool (IfCb->IfInfo);
    }

    FreePool (IfCb);

    Entry     = NextEntry;
    NextEntry = Entry->ForwardLink;
  }

  FreePool (Private);
}

/**
  Function for 'ifconfig6' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).

  @retval SHELL_SUCCESS   ifconfig6 command processed successfully.
  @retval others          The ifconfig6 command process failed.

**/
SHELL_STATUS
EFIAPI
ShellCommandRunIfconfig6 (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS              Status;
  SHELL_STATUS            ShellStatus;
  IFCONFIG6_PRIVATE_DATA  *Private;
  LIST_ENTRY              *ParamPackage;
  CONST CHAR16            *ValueStr;
  ARG_LIST                *ArgList;
  CHAR16                  *ProblemParam;
  CHAR16                  *Str;

  Private     = NULL;
  Status      = EFI_INVALID_PARAMETER;
  ShellStatus = SHELL_SUCCESS;

  Status = ShellCommandLineParseEx (mIfConfig6CheckList, &ParamPackage, &ProblemParam, TRUE, FALSE);
  if (EFI_ERROR (Status)) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_INVALID_COMMAND), gShellNetwork2HiiHandle, L"ifconfig6", ProblemParam);
    ShellStatus = SHELL_INVALID_PARAMETER;
    goto ON_EXIT;
  }

  //
  // To handle no option.
  //
  if (!ShellCommandLineGetFlag (ParamPackage, L"-r") && !ShellCommandLineGetFlag (ParamPackage, L"-s") &&
      !ShellCommandLineGetFlag (ParamPackage, L"-?") && !ShellCommandLineGetFlag (ParamPackage, L"-l"))
  {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_LACK_OPTION), gShellNetwork2HiiHandle);
    ShellStatus = SHELL_INVALID_PARAMETER;
    goto ON_EXIT;
  }

  //
  // To handle conflict options.
  //
  if (((ShellCommandLineGetFlag (ParamPackage, L"-r")) && (ShellCommandLineGetFlag (ParamPackage, L"-s"))) ||
      ((ShellCommandLineGetFlag (ParamPackage, L"-r")) && (ShellCommandLineGetFlag (ParamPackage, L"-l"))) ||
      ((ShellCommandLineGetFlag (ParamPackage, L"-r")) && (ShellCommandLineGetFlag (ParamPackage, L"-?"))) ||
      ((ShellCommandLineGetFlag (ParamPackage, L"-s")) && (ShellCommandLineGetFlag (ParamPackage, L"-l"))) ||
      ((ShellCommandLineGetFlag (ParamPackage, L"-s")) && (ShellCommandLineGetFlag (ParamPackage, L"-?"))) ||
      ((ShellCommandLineGetFlag (ParamPackage, L"-l")) && (ShellCommandLineGetFlag (ParamPackage, L"-?"))))
  {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_CONFLICT_OPTIONS), gShellNetwork2HiiHandle);
    ShellStatus = SHELL_INVALID_PARAMETER;
    goto ON_EXIT;
  }

  Private = AllocateZeroPool (sizeof (IFCONFIG6_PRIVATE_DATA));

  if (Private == NULL) {
    ShellStatus = SHELL_OUT_OF_RESOURCES;
    goto ON_EXIT;
  }

  InitializeListHead (&Private->IfList);

  //
  // To get interface name for the list option.
  //
  if (ShellCommandLineGetFlag (ParamPackage, L"-l")) {
    Private->OpCode = IfConfig6OpList;
    ValueStr        = ShellCommandLineGetValue (ParamPackage, L"-l");
    if (ValueStr != NULL) {
      Str = AllocateCopyPool (StrSize (ValueStr), ValueStr);
      if (Str == NULL) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_OUT_MEM), gShellNetwork2HiiHandle, L"ifconfig6");
        ShellStatus = SHELL_OUT_OF_RESOURCES;
        goto ON_EXIT;
      }

      Private->IfName = Str;
    }
  }

  //
  // To get interface name for the clear option.
  //
  if (ShellCommandLineGetFlag (ParamPackage, L"-r")) {
    Private->OpCode = IfConfig6OpClear;
    ValueStr        = ShellCommandLineGetValue (ParamPackage, L"-r");
    if (ValueStr != NULL) {
      Str = AllocateCopyPool (StrSize (ValueStr), ValueStr);
      if (Str == NULL) {
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_OUT_MEM), gShellNetwork2HiiHandle, L"ifconfig6");
        ShellStatus = SHELL_OUT_OF_RESOURCES;
        goto ON_EXIT;
      }

      Private->IfName = Str;
    }
  }

  //
  // To get interface name and corresponding Args for the set option.
  //
  if (ShellCommandLineGetFlag (ParamPackage, L"-s")) {
    ValueStr = ShellCommandLineGetValue (ParamPackage, L"-s");
    if (ValueStr == NULL) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_LACK_INTERFACE), gShellNetwork2HiiHandle);
      ShellStatus = SHELL_INVALID_PARAMETER;
      goto ON_EXIT;
    }

    //
    // To split the configuration into multi-section.
    //
    ArgList = IfConfig6SplitStrToList (ValueStr, L' ');
    if (ArgList == NULL) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_OUT_MEM), gShellNetwork2HiiHandle, L"ifconfig6");
      ShellStatus = SHELL_OUT_OF_RESOURCES;
      goto ON_EXIT;
    }

    Private->OpCode = IfConfig6OpSet;
    Private->IfName = ArgList->Arg;

    Private->VarArg = ArgList->Next;

    if ((Private->IfName == NULL) || (Private->VarArg == NULL)) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_IFCONFIG6_ERR_LACK_COMMAND), gShellNetwork2HiiHandle);
      ShellStatus = SHELL_INVALID_PARAMETER;
      goto ON_EXIT;
    }
  }

  //
  // Main process of ifconfig6.
  //
  ShellStatus = IfConfig6 (Private);

ON_EXIT:

  ShellCommandLineFreeVarList (ParamPackage);
  if (Private != NULL) {
    IfConfig6Cleanup (Private);
  }

  return ShellStatus;
}