1. Import NetLib, IpIoLib and UdpIoLib class definitions

2. Import DxeNetLib, DxeIpIoLib and DxeUdpIoLib libraries instances
2. Port Ip4Config module

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3405 6f19259b-4bc3-4df7-8a09-765794883524

11 files changed, 6565 insertions, 0 deletions

diff --git a/MdeModulePkg/Include/Library/IpIoLib.h b/MdeModulePkg/Include/Library/IpIoLib.h
new file mode 100644
index 0000000000..15cfbf8f43
--- /dev/null
+++ b/MdeModulePkg/Include/Library/IpIoLib.h
@@ -0,0 +1,255 @@
+/** @file
+
+Copyright (c) 2005 - 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:
+
+  IpIo.h
+
+Abstract:
+
+
+**/
+
+#ifndef _IP_IO_H_
+#define _IP_IO_H_
+
+#include <PiDxe.h>
+#include <Protocol/Ip4.h>

+#include <Library/IpIoLib.h>

+#include <Library/NetLib.h>
+
+//

+// type and code define for ICMP protocol error got

+// from IP

+//

+#define ICMP_TYPE_UNREACH              3

+#define ICMP_TYPE_TIMXCEED            11

+#define ICMP_TYPE_PARAMPROB            12

+#define ICMP_TYPE_SOURCEQUENCH         4

+

+#define ICMP_CODE_UNREACH_NET          0

+#define ICMP_CODE_UNREACH_HOST         1

+#define ICMP_CODE_UNREACH_PROTOCOL     2

+#define ICMP_CODE_UNREACH_PORT         3

+#define ICMP_CODE_UNREACH_NEEDFRAG     4

+#define ICMP_CODE_UNREACH_SRCFAIL      5

+#define ICMP_CODE_UNREACH_NET_UNKNOWN  6

+#define ICMP_CODE_UNREACH_HOST_UNKNOWN 7

+#define ICMP_CODE_UNREACH_ISOLATED     8

+#define ICMP_CODE_UNREACH_NET_PROHIB   9

+#define ICMP_CODE_UNREACH_HOST_PROHIB  10

+#define ICMP_CODE_UNREACH_TOSNET       11

+#define ICMP_CODE_UNREACH_TOSHOST      12

+

+//

+// this error will be delivered to the

+// listening transportation layer protocol

+// consuming IpIO

+//

+typedef enum {

+  ICMP_ERR_UNREACH_NET      = 0,

+  ICMP_ERR_UNREACH_HOST,

+  ICMP_ERR_UNREACH_PROTOCOL,

+  ICMP_ERR_UNREACH_PORT,

+  ICMP_ERR_MSGSIZE,

+  ICMP_ERR_UNREACH_SRCFAIL,

+  ICMP_ERR_TIMXCEED_INTRANS,

+  ICMP_ERR_TIMXCEED_REASS,

+  ICMP_ERR_QUENCH,

+  ICMP_ERR_PARAMPROB

+} ICMP_ERROR;

+

+typedef struct _ICMP_ERROR_INFO {

+  EFI_STATUS  Error;

+  BOOLEAN     IsHard;

+  BOOLEAN     Notify;

+} ICMP_ERROR_INFO;

+
+//
+// Driver Consumed Protocol Prototypes
+//
+//@MT:#include EFI_PROTOCOL_CONSUMER (Ip4)
+//@MT:#include EFI_PROTOCOL_CONSUMER (Udp4)
+
+#define EFI_IP4_HEADER_LEN(HdrPtr) ((HdrPtr)->HeaderLength << 2)
+
+extern EFI_IP4_CONFIG_DATA  mIpIoDefaultIpConfigData;
+
+typedef struct _EFI_NET_SESSION_DATA {
+  IP4_ADDR        Source;
+  IP4_ADDR        Dest;
+  EFI_IP4_HEADER  *IpHdr;
+} EFI_NET_SESSION_DATA;
+
+typedef
+VOID
+(*PKT_RCVD_NOTIFY) (
+  IN EFI_STATUS           Status,  // rcvd pkt result
+  IN ICMP_ERROR           IcmpErr, // if Status == EFI_ICMP_ERROR, this
+                                  // field is valid for user
+  IN EFI_NET_SESSION_DATA *NetSession, // the communication point
+  IN NET_BUF              *Pkt,    // packet received
+  IN VOID                 *Context // the Context provided by user for recive data
+  );
+
+typedef
+VOID
+(*PKT_SENT_NOTIFY) (
+  IN EFI_STATUS  Status,      // sent pkt result
+  IN VOID        *Context,    // the context provided by user for sending data
+  IN VOID        *Sender,     // the sender to be notified
+  IN VOID        *NotifyData  // sent pkt related data to notify
+  );
+
+typedef struct _IP_IO {
+
+  //
+  // the node used to link this IpIo to the active IpIo list.
+  //
+  NET_LIST_ENTRY                Entry;
+
+  // the list used to maintain the IP instance for different sending purpose.
+  //
+  NET_LIST_ENTRY                IpList;
+
+  //
+  // the ip instance consumed by this IP IO
+  //
+  EFI_HANDLE                    Controller;
+  EFI_HANDLE                    Image;
+  EFI_HANDLE                    ChildHandle;
+  EFI_IP4_PROTOCOL              *Ip;
+  BOOLEAN                       IsConfigured;
+
+  //
+  // some ip config data can be changed
+  //
+  UINT8                         Protocol;
+
+  //
+  // token and event used to get data from IP
+  //
+  EFI_IP4_COMPLETION_TOKEN      RcvToken;
+
+  //
+  // list entry used to link the token passed to IP_IO
+  //
+  NET_LIST_ENTRY                PendingSndList;
+
+  //
+  // User interface used to get notify from IP_IO
+  //
+  VOID                          *RcvdContext;
+  VOID                          *SndContext;
+  PKT_RCVD_NOTIFY               PktRcvdNotify;
+  PKT_SENT_NOTIFY               PktSentNotify;
+} IP_IO;
+
+typedef struct _IP_IO_OPEN_DATA {
+  EFI_IP4_CONFIG_DATA IpConfigData;
+  VOID                *RcvdContext;
+  VOID                *SndContext;
+  PKT_RCVD_NOTIFY     PktRcvdNotify;
+  PKT_SENT_NOTIFY     PktSentNotify;
+} IP_IO_OPEN_DATA;
+
+typedef struct _IP_IO_SEND_ENTRY {
+  NET_LIST_ENTRY            Entry;
+  IP_IO                     *IpIo;
+  VOID                      *Context;
+  VOID                      *NotifyData;
+  EFI_IP4_PROTOCOL          *Ip;
+  NET_BUF                   *Pkt;
+  EFI_IP4_COMPLETION_TOKEN  *SndToken;
+} IP_IO_SEND_ENTRY;
+
+typedef struct _EFI_IP4_OVERRIDE_DATA IP_IO_OVERRIDE;
+
+typedef struct _IP_IO_IP_INFO {
+  IP4_ADDR                  Addr;
+  IP4_ADDR                  SubnetMask;
+  NET_LIST_ENTRY            Entry;
+  EFI_HANDLE                ChildHandle;
+  EFI_IP4_PROTOCOL          *Ip;
+  EFI_IP4_COMPLETION_TOKEN  DummyRcvToken;
+  INTN                      RefCnt;
+} IP_IO_IP_INFO;
+
+IP_IO *
+IpIoCreate (
+  IN EFI_HANDLE Image,
+  IN EFI_HANDLE Controller
+  );
+
+EFI_STATUS
+IpIoDestroy (
+  IN IP_IO *IpIo
+  );
+
+EFI_STATUS
+IpIoStop (
+  IN IP_IO *IpIo
+  );
+
+EFI_STATUS
+IpIoOpen (
+  IN IP_IO           *IpIo,
+  IN IP_IO_OPEN_DATA *OpenData
+  );
+
+EFI_STATUS
+IpIoSend (
+  IN IP_IO           *IpIo,
+  IN NET_BUF         *Pkt,
+  IN IP_IO_IP_INFO   *Sender,
+  IN VOID            *Context    OPTIONAL,
+  IN VOID            *NotifyData OPTIONAL,
+  IN IP4_ADDR        Dest,
+  IN IP_IO_OVERRIDE  *OverrideData
+  );
+
+VOID
+IpIoCancelTxToken (
+  IN IP_IO  *IpIo,
+  IN VOID   *Packet
+  );
+
+IP_IO_IP_INFO *
+IpIoAddIp (
+  IN IP_IO  *IpIo
+  );
+
+EFI_STATUS
+IpIoConfigIp (
+  IN     IP_IO_IP_INFO        *IpInfo,
+  IN OUT EFI_IP4_CONFIG_DATA  *Ip4ConfigData OPTIONAL
+  );
+
+VOID
+IpIoRemoveIp (
+  IN IP_IO            *IpIo,
+  IN IP_IO_IP_INFO    *IpInfo
+  );
+
+IP_IO_IP_INFO *
+IpIoFindSender (
+  IN OUT IP_IO     **IpIo,
+  IN     IP4_ADDR  Src
+  );
+
+EFI_STATUS
+IpIoGetIcmpErrStatus (
+  IN  ICMP_ERROR  IcmpError,
+  OUT BOOLEAN     *IsHard, OPTIONAL
+  OUT BOOLEAN     *Notify OPTIONAL
+  );
+
+#endif
diff --git a/MdeModulePkg/Include/Library/NetLib.h b/MdeModulePkg/Include/Library/NetLib.h
new file mode 100644
index 0000000000..215a2fb094
--- /dev/null
+++ b/MdeModulePkg/Include/Library/NetLib.h
@@ -0,0 +1,812 @@
+/** @file
+
+Copyright (c) 2005 - 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:
+
+  NetLib.h
+
+Abstract:
+
+  Library for the UEFI network stack.
+
+
+**/
+
+#ifndef _NET_LIB_H_
+#define _NET_LIB_H_
+
+#include <PiDxe.h>
+#include <Protocol/DriverBinding.h>
+#include <Protocol/ComponentName.h>
+#include <Protocol/DriverConfiguration.h>
+#include <Protocol/DriverDiagnostics.h>
+
+#define EFI_NET_LITTLE_ENDIAN
+
+typedef UINT32          IP4_ADDR;
+typedef UINT32          TCP_SEQNO;
+typedef UINT16          TCP_PORTNO;
+
+enum {
+  NET_ETHER_ADDR_LEN    = 6,
+  NET_IFTYPE_ETHERNET   = 0x01,
+
+  EFI_IP_PROTO_UDP      = 0x11,
+  EFI_IP_PROTO_TCP      = 0x06,
+  EFI_IP_PROTO_ICMP     = 0x01,
+
+  //
+  // The address classfication
+  //
+  IP4_ADDR_CLASSA       = 1,
+  IP4_ADDR_CLASSB,
+  IP4_ADDR_CLASSC,
+  IP4_ADDR_CLASSD,
+  IP4_ADDR_CLASSE,
+
+  IP4_MASK_NUM          = 33,
+};
+
+#pragma pack(1)
+
+//
+// Ethernet head definition
+//
+typedef struct {
+  UINT8                 DstMac [NET_ETHER_ADDR_LEN];
+  UINT8                 SrcMac [NET_ETHER_ADDR_LEN];
+  UINT16                EtherType;
+} ETHER_HEAD;
+
+
+//
+// The EFI_IP4_HEADER is hard to use because the source and
+// destination address are defined as EFI_IPv4_ADDRESS, which
+// is a structure. Two structures can't be compared or masked
+// directly. This is why there is an internal representation.
+//
+typedef struct {
+#ifdef EFI_NET_LITTLE_ENDIAN
+  UINT8                 HeadLen : 4;
+  UINT8                 Ver     : 4;
+#else
+  UINT8                 Ver     : 4;
+  UINT8                 HeadLen : 4;
+#endif
+  UINT8                 Tos;
+  UINT16                TotalLen;
+  UINT16                Id;
+  UINT16                Fragment;
+  UINT8                 Ttl;
+  UINT8                 Protocol;
+  UINT16                Checksum;
+  IP4_ADDR              Src;
+  IP4_ADDR              Dst;
+} IP4_HEAD;
+
+
+//
+// ICMP head definition. ICMP message is categoried as either an error
+// message or query message. Two message types have their own head format.
+//
+typedef struct {
+  UINT8                 Type;
+  UINT8                 Code;
+  UINT16                Checksum;
+} IP4_ICMP_HEAD;
+
+typedef struct {
+  IP4_ICMP_HEAD         Head;
+  UINT32                Fourth; // 4th filed of the head, it depends on Type.
+  IP4_HEAD              IpHead;
+} IP4_ICMP_ERROR_HEAD;
+
+typedef struct {
+  IP4_ICMP_HEAD         Head;
+  UINT16                Id;
+  UINT16                Seq;
+} IP4_ICMP_QUERY_HEAD;
+
+
+//
+// UDP header definition
+//
+typedef struct {
+  UINT16                SrcPort;
+  UINT16                DstPort;
+  UINT16                Length;
+  UINT16                Checksum;
+} EFI_UDP4_HEADER;
+
+
+//
+// TCP header definition
+//
+typedef struct {
+  TCP_PORTNO            SrcPort;
+  TCP_PORTNO            DstPort;
+  TCP_SEQNO             Seq;
+  TCP_SEQNO             Ack;
+#ifdef EFI_NET_LITTLE_ENDIAN
+  UINT8                 Res     : 4;
+  UINT8                 HeadLen : 4;
+#else
+  UINT8                 HeadLen : 4;
+  UINT8                 Res     : 4;
+#endif
+  UINT8                 Flag;
+  UINT16                Wnd;
+  UINT16                Checksum;
+  UINT16                Urg;
+} TCP_HEAD;
+
+#pragma pack()
+
+#define NET_MAC_EQUAL(pMac1, pMac2, Len)     \
+    (NetCompareMem ((pMac1), (pMac2), Len) == 0)
+
+#define NET_MAC_IS_MULTICAST(Mac, BMac, Len) \
+    (((*((UINT8 *) Mac) & 0x01) == 0x01) && (!NET_MAC_EQUAL (Mac, BMac, Len)))
+
+#ifdef EFI_NET_LITTLE_ENDIAN
+#define NTOHL(x) (UINT32)((((UINT32) (x) & 0xff)     << 24) | \
+                          (((UINT32) (x) & 0xff00)   << 8)  | \
+                          (((UINT32) (x) & 0xff0000) >> 8)  | \
+                          (((UINT32) (x) & 0xff000000) >> 24))
+
+#define HTONL(x)  NTOHL(x)
+
+#define NTOHS(x)  (UINT16)((((UINT16) (x) & 0xff) << 8) | \
+                           (((UINT16) (x) & 0xff00) >> 8))
+
+#define HTONS(x)  NTOHS(x)
+#else
+#define NTOHL(x)  (UINT32)(x)
+#define HTONL(x)  (UINT32)(x)
+#define NTOHS(x)  (UINT16)(x)
+#define HTONS(x)  (UINT16)(x)
+#endif
+
+//
+// Test the IP's attribute, All the IPs are in host byte order.
+//
+#define IP4_IS_MULTICAST(Ip)              (((Ip) & 0xF0000000) == 0xE0000000)
+#define IP4_IS_LOCAL_BROADCAST(Ip)        ((Ip) == 0xFFFFFFFF)
+#define IP4_NET_EQUAL(Ip1, Ip2, NetMask)  (((Ip1) & (NetMask)) == ((Ip2) & (NetMask)))
+#define IP4_IS_VALID_NETMASK(Ip)          (NetGetMaskLength (Ip) != IP4_MASK_NUM)
+
+//
+// Convert the EFI_IP4_ADDRESS to plain UINT32 IP4 address.
+//
+#define EFI_IP4(EfiIpAddr)                (*(IP4_ADDR *) ((EfiIpAddr).Addr))
+#define EFI_NTOHL(EfiIp)                  (NTOHL (EFI_IP4 ((EfiIp))))
+#define EFI_IP_EQUAL(Ip1, Ip2)            (EFI_IP4 (Ip1) == EFI_IP4 (Ip2))
+
+INTN
+NetGetMaskLength (
+  IN IP4_ADDR               Mask
+  );
+
+INTN
+NetGetIpClass (
+  IN IP4_ADDR               Addr
+  );
+
+BOOLEAN
+Ip4IsUnicast (
+  IN IP4_ADDR               Ip,
+  IN IP4_ADDR               NetMask
+  );
+
+extern IP4_ADDR mIp4AllMasks [IP4_MASK_NUM];
+
+//@MT:#include EFI_PROTOCOL_CONSUMER (LoadedImage)
+//@MT:#include EFI_PROTOCOL_CONSUMER (ServiceBinding)
+//@MT:#include EFI_PROTOCOL_CONSUMER (SimpleNetwork)
+
+//
+// Wrap functions to ease the impact of EFI library changes.
+//
+#define NetAllocateZeroPool     AllocateZeroPool
+#define NetAllocatePool         AllocatePool
+#define NetFreePool             gBS->FreePool
+#define NetCopyMem              CopyMem
+#define NetSetMem               SetMem
+#define NetZeroMem(Dest, Len)   SetMem ((Dest), (Len), 0)
+#define NetCompareMem           CompareMem
+
+//
+// Lock primitives: the stack implements its lock primitives according
+// to the standard EFI enviornment. It will NOT consider multiprocessor.
+//
+#define NET_TPL_LOCK            TPL_CALLBACK
+#define NET_TPL_RECYCLE_LOCK    (NET_TPL_LOCK + 1)
+#define NET_TPL_EVENT           TPL_CALLBACK
+#define NET_TPL_RECYCLE         (NET_TPL_LOCK + 1)
+#define NET_TPL_SLOW_TIMER      (TPL_CALLBACK - 1)
+#define NET_TPL_FAST_TIMER      NET_TPL_RECYCLE
+#define NET_TPL_TIMER           TPL_CALLBACK
+
+#define NET_LOCK                 EFI_LOCK
+#define NET_LOCK_INIT(x)         EfiInitializeLock (x, NET_TPL_LOCK)
+#define NET_RECYCLE_LOCK_INIT(x) EfiInitializeLock (x, NET_TPL_RECYCLE_LOCK)
+#define NET_TRYLOCK(x)           EfiAcquireLockOrFail (x)
+#define NET_UNLOCK(x)            EfiReleaseLock (x)
+
+#define NET_RAISE_TPL(x)        (gBS->RaiseTPL (x))
+#define NET_RESTORE_TPL(x)      (gBS->RestoreTPL (x))
+
+#define TICKS_PER_MS            10000U
+#define TICKS_PER_SECOND        10000000U
+
+#define NET_MIN(a, b)           ((a) < (b) ? (a) : (b))
+#define NET_MAX(a, b)           ((a) > (b) ? (a) : (b))
+#define NET_RANDOM(Seed)        (((Seed) * 1103515245L + 12345) % 4294967295L)
+
+
+UINT32
+NetGetUint32 (
+  IN UINT8                  *Buf
+  );
+
+VOID
+NetPutUint32 (
+  IN UINT8                  *Buf,
+  IN UINT32                 Data
+  );
+
+UINT32
+NetRandomInitSeed (
+  VOID
+  );
+
+
+//
+// Double linked list entry functions, this extends the
+// EFI list functions.
+//
+typedef LIST_ENTRY      NET_LIST_ENTRY;
+
+#define NetListInit(Head)              InitializeListHead(Head)
+#define NetListInsertHead(Head, Entry) InsertHeadList((Head), (Entry))
+#define NetListInsertTail(Head, Entry) InsertTailList((Head), (Entry))
+#define NetListIsEmpty(List)           IsListEmpty(List)
+
+#define NET_LIST_USER_STRUCT(Entry, Type, Field)        \
+          _CR(Entry, Type, Field)
+
+#define NET_LIST_USER_STRUCT_S(Entry, Type, Field, Sig)  \
+          CR(Entry, Type, Field, Sig)
+
+//
+// Iterate through the doule linked list. It is NOT delete safe
+//
+#define NET_LIST_FOR_EACH(Entry, ListHead) \
+  for(Entry = (ListHead)->ForwardLink; Entry != (ListHead); Entry = Entry->ForwardLink)
+
+//
+// Iterate through the doule linked list. This is delete-safe.
+// Don't touch NextEntry. Also, don't use this macro if list
+// entries other than the Entry may be deleted when processing
+// the current Entry.
+//
+#define NET_LIST_FOR_EACH_SAFE(Entry, NextEntry, ListHead) \
+  for(Entry = (ListHead)->ForwardLink, NextEntry = Entry->ForwardLink; \
+      Entry != (ListHead); \
+      Entry = NextEntry, NextEntry = Entry->ForwardLink \
+     )
+
+//
+// Make sure the list isn't empty before get the frist/last record.
+//
+#define NET_LIST_HEAD(ListHead, Type, Field)  \
+          NET_LIST_USER_STRUCT((ListHead)->ForwardLink, Type, Field)
+
+#define NET_LIST_TAIL(ListHead, Type, Field)  \
+          NET_LIST_USER_STRUCT((ListHead)->BackLink, Type, Field)
+
+#define NetListRemoveEntry(Entry) RemoveEntryList (Entry)
+
+NET_LIST_ENTRY*
+NetListRemoveHead (
+  NET_LIST_ENTRY            *Head
+  );
+
+NET_LIST_ENTRY*
+NetListRemoveTail (
+  NET_LIST_ENTRY            *Head
+  );
+
+VOID
+NetListInsertAfter (
+  IN NET_LIST_ENTRY         *PrevEntry,
+  IN NET_LIST_ENTRY         *NewEntry
+  );
+
+VOID
+NetListInsertBefore (
+  IN NET_LIST_ENTRY         *PostEntry,
+  IN NET_LIST_ENTRY         *NewEntry
+  );
+
+
+//
+// Object container: EFI network stack spec defines various kinds of
+// tokens. The drivers can share code to manage those objects.
+//
+typedef struct {
+  NET_LIST_ENTRY            Link;
+  VOID                      *Key;
+  VOID                      *Value;
+} NET_MAP_ITEM;
+
+typedef struct {
+  NET_LIST_ENTRY            Used;
+  NET_LIST_ENTRY            Recycled;
+  UINTN                     Count;
+} NET_MAP;
+
+#define NET_MAP_INCREAMENT  64
+
+VOID
+NetMapInit (
+  IN NET_MAP                *Map
+  );
+
+VOID
+NetMapClean (
+  IN NET_MAP                *Map
+  );
+
+BOOLEAN
+NetMapIsEmpty (
+  IN NET_MAP                *Map
+  );
+
+UINTN
+NetMapGetCount (
+  IN NET_MAP                *Map
+  );
+
+EFI_STATUS
+NetMapInsertHead (
+  IN NET_MAP                *Map,
+  IN VOID                   *Key,
+  IN VOID                   *Value    OPTIONAL
+  );
+
+EFI_STATUS
+NetMapInsertTail (
+  IN NET_MAP                *Map,
+  IN VOID                   *Key,
+  IN VOID                   *Value    OPTIONAL
+  );
+
+NET_MAP_ITEM  *
+NetMapFindKey (
+  IN  NET_MAP               *Map,
+  IN  VOID                  *Key
+  );
+
+VOID *
+NetMapRemoveItem (
+  IN  NET_MAP               *Map,
+  IN  NET_MAP_ITEM          *Item,
+  OUT VOID                  **Value   OPTIONAL
+  );
+
+VOID *
+NetMapRemoveHead (
+  IN  NET_MAP               *Map,
+  OUT VOID                  **Value   OPTIONAL
+  );
+
+VOID *
+NetMapRemoveTail (
+  IN  NET_MAP               *Map,
+  OUT VOID                  **Value OPTIONAL
+  );
+
+typedef
+EFI_STATUS
+(*NET_MAP_CALLBACK) (
+  IN NET_MAP                *Map,
+  IN NET_MAP_ITEM           *Item,
+  IN VOID                   *Arg
+  );
+
+EFI_STATUS
+NetMapIterate (
+  IN NET_MAP                *Map,
+  IN NET_MAP_CALLBACK       CallBack,
+  IN VOID                   *Arg      OPTIONAL
+  );
+
+
+//
+// Helper functions to implement driver binding and service binding protocols.
+//
+EFI_STATUS
+NetLibCreateServiceChild (
+  IN  EFI_HANDLE            ControllerHandle,
+  IN  EFI_HANDLE            ImageHandle,
+  IN  EFI_GUID              *ServiceBindingGuid,
+  OUT EFI_HANDLE            *ChildHandle
+  );
+
+EFI_STATUS
+NetLibDestroyServiceChild (
+  IN  EFI_HANDLE            ControllerHandle,
+  IN  EFI_HANDLE            ImageHandle,
+  IN  EFI_GUID              *ServiceBindingGuid,
+  IN  EFI_HANDLE            ChildHandle
+  );
+
+EFI_STATUS
+NetLibGetMacString (
+  IN           EFI_HANDLE  SnpHandle,
+  IN           EFI_HANDLE  ImageHandle,
+  IN OUT CONST CHAR16      **MacString
+  );
+
+EFI_HANDLE
+NetLibGetNicHandle (
+  IN EFI_HANDLE             Controller,
+  IN EFI_GUID               *ProtocolGuid
+  );
+
+typedef
+EFI_STATUS
+(EFIAPI *NET_LIB_DRIVER_UNLOAD) (
+  IN EFI_HANDLE             ImageHandle
+  );
+
+EFI_STATUS
+EFIAPI
+NetLibDefaultUnload (
+  IN EFI_HANDLE             ImageHandle
+  );
+
+EFI_STATUS
+NetLibInstallAllDriverProtocolsWithUnload (
+  IN EFI_HANDLE                         ImageHandle,
+  IN EFI_SYSTEM_TABLE                   *SystemTable,
+  IN EFI_DRIVER_BINDING_PROTOCOL        *DriverBinding,
+  IN EFI_HANDLE                         DriverBindingHandle,
+  IN EFI_COMPONENT_NAME_PROTOCOL        *ComponentName,       OPTIONAL
+  IN EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration, OPTIONAL
+  IN EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics, OPTIONAL
+  IN NET_LIB_DRIVER_UNLOAD              CustomizedUnload
+  );
+
+EFI_STATUS
+NetLibInstallAllDriverProtocols (
+  IN EFI_HANDLE                         ImageHandle,
+  IN EFI_SYSTEM_TABLE                   *SystemTable,
+  IN EFI_DRIVER_BINDING_PROTOCOL        *DriverBinding,
+  IN EFI_HANDLE                         DriverBindingHandle,
+  IN EFI_COMPONENT_NAME_PROTOCOL        *ComponentName,       OPTIONAL
+  IN EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration, OPTIONAL
+  IN EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics OPTIONAL
+  );
+

+enum {
+  //
+  //Various signatures
+  //
+  NET_BUF_SIGNATURE    = EFI_SIGNATURE_32 ('n', 'b', 'u', 'f'),
+  NET_VECTOR_SIGNATURE = EFI_SIGNATURE_32 ('n', 'v', 'e', 'c'),
+  NET_QUE_SIGNATURE    = EFI_SIGNATURE_32 ('n', 'b', 'q', 'u'),
+
+
+  NET_PROTO_DATA       = 64,   // Opaque buffer for protocols
+  NET_BUF_HEAD         = 1,    // Trim or allocate space from head
+  NET_BUF_TAIL         = 0,    // Trim or allocate space from tail
+  NET_VECTOR_OWN_FIRST = 0x01, // We allocated the 1st block in the vector
+};
+
+#define NET_CHECK_SIGNATURE(PData, SIGNATURE) \
+  ASSERT (((PData) != NULL) && ((PData)->Signature == (SIGNATURE)))
+
+#define NET_SWAP_SHORT(Value) \
+  ((((Value) & 0xff) << 8) | (((Value) >> 8) & 0xff))
+
+//
+// Single memory block in the vector.
+//
+typedef struct {
+  UINT32              Len;        // The block's length
+  UINT8               *Bulk;      // The block's Data
+} NET_BLOCK;
+
+typedef VOID (*NET_VECTOR_EXT_FREE) (VOID *Arg);
+
+//
+//NET_VECTOR contains several blocks to hold all packet's
+//fragments and other house-keeping stuff for sharing. It
+//doesn't specify the where actual packet fragment begins.
+//
+typedef struct {
+  UINT32              Signature;
+  INTN                RefCnt;  // Reference count to share NET_VECTOR.
+  NET_VECTOR_EXT_FREE Free;    // external function to free NET_VECTOR
+  VOID                *Arg;    // opeque argument to Free
+  UINT32              Flag;    // Flags, NET_VECTOR_OWN_FIRST
+  UINT32              Len;     // Total length of the assocated BLOCKs
+
+  UINT32              BlockNum;
+  NET_BLOCK           Block[1];
+} NET_VECTOR;
+
+//
+//NET_BLOCK_OP operate on the NET_BLOCK, It specifies
+//where the actual fragment begins and where it ends
+//
+typedef struct {
+  UINT8               *BlockHead;   // Block's head, or the smallest valid Head
+  UINT8               *BlockTail;   // Block's tail. BlockTail-BlockHead=block length
+  UINT8               *Head;        // 1st byte of the data in the block
+  UINT8               *Tail;        // Tail of the data in the block, Tail-Head=Size
+  UINT32              Size;         // The size of the data
+} NET_BLOCK_OP;
+
+
+//
+//NET_BUF is the buffer manage structure used by the
+//network stack. Every network packet may be fragmented,
+//and contains multiple fragments. The Vector points to
+//memory blocks used by the each fragment, and BlockOp
+//specifies where each fragment begins and ends.
+//
+//It also contains a opaque area for protocol to store
+//per-packet informations. Protocol must be caution not
+//to overwrite the members after that.
+//
+typedef struct {
+  UINT32              Signature;
+  INTN                RefCnt;
+  NET_LIST_ENTRY      List;       // The List this NET_BUF is on
+
+  IP4_HEAD            *Ip;        // Network layer header, for fast access
+  TCP_HEAD            *Tcp;       // Transport layer header, for fast access
+  UINT8               ProtoData [NET_PROTO_DATA]; //Protocol specific data
+
+  NET_VECTOR          *Vector;    // The vector containing the packet
+
+  UINT32              BlockOpNum; // Total number of BlockOp in the buffer
+  UINT32              TotalSize;  // Total size of the actual packet
+  NET_BLOCK_OP        BlockOp[1]; // Specify the position of actual packet
+} NET_BUF;
+
+
+//
+//A queue of NET_BUFs, It is just a thin extension of
+//NET_BUF functions.
+//
+typedef struct {
+  UINT32              Signature;
+  INTN                RefCnt;
+  NET_LIST_ENTRY      List;       // The List this buffer queue is on
+
+  NET_LIST_ENTRY      BufList;    // list of queued buffers
+  UINT32              BufSize;    // total length of DATA in the buffers
+  UINT32              BufNum;     // total number of buffers on the chain
+} NET_BUF_QUEUE;
+
+//
+// Pseudo header for TCP and UDP checksum
+//
+#pragma pack(1)
+typedef struct {
+  IP4_ADDR            SrcIp;
+  IP4_ADDR            DstIp;
+  UINT8               Reserved;
+  UINT8               Protocol;
+  UINT16              Len;
+} NET_PSEUDO_HDR;
+#pragma pack()
+
+//
+// The fragment entry table used in network interfaces. This is
+// the same as NET_BLOCK now. Use two different to distinguish
+// the two in case that NET_BLOCK be enhanced later.
+//
+typedef struct {
+  UINT32              Len;
+  UINT8               *Bulk;
+} NET_FRAGMENT;
+
+#define NET_GET_REF(PData)      ((PData)->RefCnt++)
+#define NET_PUT_REF(PData)      ((PData)->RefCnt--)
+#define NETBUF_FROM_PROTODATA(Info) _CR((Info), NET_BUF, ProtoData)
+
+#define NET_BUF_SHARED(Buf) \
+  (((Buf)->RefCnt > 1) || ((Buf)->Vector->RefCnt > 1))
+
+#define NET_VECTOR_SIZE(BlockNum) \
+  (sizeof (NET_VECTOR) + ((BlockNum) - 1) * sizeof (NET_BLOCK))
+
+#define NET_BUF_SIZE(BlockOpNum)  \
+  (sizeof (NET_BUF) + ((BlockOpNum) - 1) * sizeof (NET_BLOCK_OP))
+
+#define NET_HEADSPACE(BlockOp)  \
+  (UINTN)((BlockOp)->Head - (BlockOp)->BlockHead)
+
+#define NET_TAILSPACE(BlockOp)  \
+  (UINTN)((BlockOp)->BlockTail - (BlockOp)->Tail)
+
+NET_BUF  *
+NetbufAlloc (
+  IN UINT32                 Len
+  );
+
+VOID
+NetbufFree (
+  IN NET_BUF                *Nbuf
+  );
+
+
+UINT8  *
+NetbufGetByte (
+  IN  NET_BUF               *Nbuf,
+  IN  UINT32                Offset,
+  OUT UINT32                *Index      OPTIONAL
+  );
+
+NET_BUF  *
+NetbufClone (
+  IN NET_BUF                *Nbuf
+  );
+
+NET_BUF  *
+NetbufDuplicate (
+  IN NET_BUF                *Nbuf,
+  IN NET_BUF                *Duplicate    OPTIONAL,
+  IN UINT32                 HeadSpace
+  );
+
+NET_BUF  *
+NetbufGetFragment (
+  IN NET_BUF                *Nbuf,
+  IN UINT32                 Offset,
+  IN UINT32                 Len,
+  IN UINT32                 HeadSpace
+  );
+
+VOID
+NetbufReserve (
+  IN NET_BUF                *Nbuf,
+  IN UINT32                 Len
+  );
+
+UINT8  *
+NetbufAllocSpace (
+  IN NET_BUF                *Nbuf,
+  IN UINT32                 Len,
+  IN BOOLEAN                FromHead
+  );
+
+UINT32
+NetbufTrim (
+  IN NET_BUF                *Nbuf,
+  IN UINT32                 Len,
+  IN BOOLEAN                FromHead
+  );
+
+UINT32
+NetbufCopy (
+  IN NET_BUF                *Nbuf,
+  IN UINT32                 Offset,
+  IN UINT32                 Len,
+  IN UINT8                  *Dest
+  );
+
+NET_BUF  *
+NetbufFromExt (
+  IN NET_FRAGMENT           *ExtFragment,
+  IN UINT32                 ExtNum,
+  IN UINT32                 HeadSpace,
+  IN UINT32                 HeadLen,
+  IN NET_VECTOR_EXT_FREE    ExtFree,
+  IN VOID                   *Arg          OPTIONAL
+  );
+
+EFI_STATUS
+NetbufBuildExt (
+  IN NET_BUF                *Nbuf,
+  IN NET_FRAGMENT           *ExtFragment,
+  IN UINT32                 *ExtNum
+  );
+
+NET_BUF  *
+NetbufFromBufList (
+  IN NET_LIST_ENTRY         *BufList,
+  IN UINT32                 HeadSpace,
+  IN UINT32                 HeaderLen,
+  IN NET_VECTOR_EXT_FREE    ExtFree,
+  IN VOID                   *Arg                OPTIONAL
+  );
+
+VOID
+NetbufFreeList (
+  IN NET_LIST_ENTRY         *Head
+  );
+
+VOID
+NetbufQueInit (
+  IN NET_BUF_QUEUE          *NbufQue
+  );
+
+NET_BUF_QUEUE  *
+NetbufQueAlloc (
+  VOID
+  );
+
+VOID
+NetbufQueFree (
+  IN NET_BUF_QUEUE          *NbufQue
+  );
+
+NET_BUF  *
+NetbufQueRemove (
+  IN NET_BUF_QUEUE          *NbufQue
+  );
+
+VOID
+NetbufQueAppend (
+  IN NET_BUF_QUEUE          *NbufQue,
+  IN NET_BUF                *Nbuf
+  );
+
+UINT32
+NetbufQueCopy (
+  IN NET_BUF_QUEUE          *NbufQue,
+  IN UINT32                 Offset,
+  IN UINT32                 Len,
+  IN UINT8                  *Dest
+  );
+
+UINT32
+NetbufQueTrim (
+  IN NET_BUF_QUEUE          *NbufQue,
+  IN UINT32                 Len
+  );
+
+VOID
+NetbufQueFlush (
+  IN NET_BUF_QUEUE          *NbufQue
+  );
+
+UINT16
+NetblockChecksum (
+  IN UINT8                  *Bulk,
+  IN UINT32                 Len
+  );
+
+UINT16
+NetAddChecksum (
+  IN UINT16                 Checksum1,
+  IN UINT16                 Checksum2
+  );
+
+UINT16
+NetbufChecksum (
+  IN NET_BUF                *Nbuf
+  );
+
+UINT16
+NetPseudoHeadChecksum (
+  IN IP4_ADDR               Src,
+  IN IP4_ADDR               Dst,
+  IN UINT8                  Proto,
+  IN UINT16                 Len
+  );
+#endif
diff --git a/MdeModulePkg/Include/Library/UdpIoLib.h b/MdeModulePkg/Include/Library/UdpIoLib.h
new file mode 100644
index 0000000000..3f49cc9209
--- /dev/null
+++ b/MdeModulePkg/Include/Library/UdpIoLib.h
@@ -0,0 +1,177 @@
+/** @file
+
+Copyright (c) 2006, 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:
+
+  Udp4Io.h
+
+Abstract:
+
+  The helper routines to access UDP service. It is used by both
+  DHCP and MTFTP.
+
+
+**/
+
+#ifndef _UDP4IO_H_
+#define _UDP4IO_H_
+
+#include <PiDxe.h>

+

+#include <Protocol/Udp4.h>

+

+#include <Library/UdpIoLib.h>
+#include <Library/NetLib.h>
+
+typedef struct _UDP_IO_PORT UDP_IO_PORT;
+
+enum {
+  UDP_IO_RX_SIGNATURE = EFI_SIGNATURE_32 ('U', 'D', 'P', 'R'),
+  UDP_IO_TX_SIGNATURE = EFI_SIGNATURE_32 ('U', 'D', 'P', 'T'),
+  UDP_IO_SIGNATURE    = EFI_SIGNATURE_32 ('U', 'D', 'P', 'I'),
+};
+
+typedef struct {
+  IP4_ADDR                  LocalAddr;
+  UINT16                    LocalPort;
+  IP4_ADDR                  RemoteAddr;
+  UINT16                    RemotePort;
+} UDP_POINTS;
+
+//
+// This prototype is used by both receive and transmission.
+// When receiving Netbuf is allocated by UDP access point, and
+// released by user. When transmitting, the NetBuf is from user,
+// and provided to the callback as a reference.
+//
+typedef
+VOID
+(*UDP_IO_CALLBACK) (
+  IN NET_BUF                *Packet,
+  IN UDP_POINTS             *Points,
+  IN EFI_STATUS             IoStatus,
+  IN VOID                   *Context
+  );
+
+//
+// Each receive request is wrapped in an UDP_RX_TOKEN. Upon completion,
+// the CallBack will be called. Only one receive request is send to UDP.
+// HeadLen gives the length of the application's header. UDP_IO will
+// make the application's header continous before delivery up.
+//
+typedef struct {
+  UINT32                    Signature;
+  UDP_IO_PORT               *UdpIo;
+
+  UDP_IO_CALLBACK           CallBack;
+  VOID                      *Context;
+
+  UINT32                    HeadLen;
+  EFI_UDP4_COMPLETION_TOKEN UdpToken;
+} UDP_RX_TOKEN;
+
+//
+// Each transmit request is wrapped in an UDP_TX_TOKEN. Upon completion,
+// the CallBack will be called. There can be several transmit requests.
+//
+typedef struct {
+  UINT32                    Signature;
+  NET_LIST_ENTRY            Link;
+  UDP_IO_PORT               *UdpIo;
+
+  UDP_IO_CALLBACK           CallBack;
+  NET_BUF                   *Packet;
+  VOID                      *Context;
+
+  EFI_UDP4_SESSION_DATA     UdpSession;
+  EFI_IPv4_ADDRESS          Gateway;
+
+  EFI_UDP4_COMPLETION_TOKEN UdpToken;
+  EFI_UDP4_TRANSMIT_DATA    UdpTxData;
+} UDP_TX_TOKEN;
+
+typedef struct _UDP_IO_PORT {
+  UINT32                    Signature;
+  NET_LIST_ENTRY            Link;
+  INTN                      RefCnt;
+
+  //
+  // Handle used to create/destory UDP child
+  //
+  EFI_HANDLE                Controller;
+  EFI_HANDLE                Image;
+  EFI_HANDLE                UdpHandle;
+
+  EFI_UDP4_PROTOCOL         *Udp;
+  EFI_UDP4_CONFIG_DATA      UdpConfig;
+  EFI_SIMPLE_NETWORK_MODE   SnpMode;
+
+  NET_LIST_ENTRY            SentDatagram;
+  UDP_RX_TOKEN              *RecvRequest;
+};
+
+typedef
+EFI_STATUS
+(*UDP_IO_CONFIG) (
+  IN UDP_IO_PORT            *UdpIo,
+  IN VOID                   *Context
+  );
+
+typedef
+BOOLEAN
+(*UDP_IO_TO_CANCEL) (
+  IN UDP_TX_TOKEN           *Token,
+  IN VOID                   *Context
+  );
+
+UDP_IO_PORT *
+UdpIoCreatePort (
+  IN  EFI_HANDLE            Controller,
+  IN  EFI_HANDLE            ImageHandle,
+  IN  UDP_IO_CONFIG         Configure,
+  IN  VOID                  *Context
+  );
+
+EFI_STATUS
+UdpIoFreePort (
+  IN  UDP_IO_PORT           *UdpIo
+  );
+
+VOID
+UdpIoCleanPort (
+  IN  UDP_IO_PORT           *UdpIo
+  );
+
+EFI_STATUS
+UdpIoSendDatagram (
+  IN  UDP_IO_PORT           *UdpIo,
+  IN  NET_BUF               *Packet,
+  IN  UDP_POINTS            *EndPoint, OPTIONAL
+  IN  IP4_ADDR              Gateway,
+  IN  UDP_IO_CALLBACK       CallBack,
+  IN  VOID                  *Context
+  );
+
+VOID
+UdpIoCancelSentDatagram (
+  IN  UDP_IO_PORT           *UdpIo,
+  IN  NET_BUF               *Packet
+  );
+
+EFI_STATUS
+UdpIoRecvDatagram (
+  IN  UDP_IO_PORT           *UdpIo,
+  IN  UDP_IO_CALLBACK       CallBack,
+  IN  VOID                  *Context,
+  IN  UINT32                HeadLen
+  );
+#endif
diff --git a/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.c b/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.c
new file mode 100644
index 0000000000..4a068eaf72
--- /dev/null
+++ b/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.c
@@ -0,0 +1,1299 @@
+/** @file

+

+Copyright (c) 2005 - 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:

+

+  IpIo.c

+

+Abstract:

+

+  The implementation of the IpIo layer.

+

+

+**/

+

+#include <PiDxe.h>

+

+#include <Protocol/Udp4.h>

+

+#include <Library/IpIoLib.h>

+#include <Library/BaseLib.h>

+#include <Library/DebugLib.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Library/MemoryAllocationLib.h>

+

+

+#define NET_PROTO_HDR(Buf, Type)  ((Type *) ((Buf)->BlockOp[0].Head))

+#define ICMP_ERRLEN(IpHdr) \

+  (sizeof(IP4_ICMP_HEAD) + EFI_IP4_HEADER_LEN(IpHdr) + 8)

+

+NET_LIST_ENTRY  mActiveIpIoList = {

+  &mActiveIpIoList,

+  &mActiveIpIoList

+};

+

+EFI_IP4_CONFIG_DATA  mIpIoDefaultIpConfigData = {

+  EFI_IP_PROTO_UDP,

+  FALSE,

+  TRUE,

+  FALSE,

+  FALSE,

+  FALSE,

+  {0, 0, 0, 0},

+  {0, 0, 0, 0},

+  0,

+  255,

+  FALSE,

+  FALSE,

+  0,

+  0

+};

+

+STATIC

+VOID

+EFIAPI

+IpIoTransmitHandler (

+  IN EFI_EVENT Event,

+  IN VOID      *Context

+  );

+

+

+/**

+  This function create an ip child ,open the IP protocol, return the opened

+  Ip protocol to Interface.

+

+  @param  ControllerHandle      The controller handle.

+  @param  ImageHandle           The image handle.

+  @param  ChildHandle           Pointer to the buffer to save the ip child handle.

+  @param  Interface             Pointer used to get the ip protocol interface.

+

+  @retval EFI_SUCCESS           The ip child is created and the ip protocol

+                                interface is retrieved.

+  @retval other                 The required operation failed.

+

+**/

+STATIC

+EFI_STATUS

+IpIoCreateIpChildOpenProtocol (

+  IN  EFI_HANDLE  ControllerHandle,

+  IN  EFI_HANDLE  ImageHandle,

+  IN  EFI_HANDLE  *ChildHandle,

+  OUT VOID        **Interface

+  )

+{

+  EFI_STATUS  Status;

+

+  //

+  // Create an ip child.

+  //

+  Status = NetLibCreateServiceChild (

+             ControllerHandle,

+             ImageHandle,

+             &gEfiIp4ServiceBindingProtocolGuid,

+             ChildHandle

+             );

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  //

+  // Open the ip protocol installed on the *ChildHandle.

+  //

+  Status = gBS->OpenProtocol (

+                  *ChildHandle,

+                  &gEfiIp4ProtocolGuid,

+                  Interface,

+                  ImageHandle,

+                  ControllerHandle,

+                  EFI_OPEN_PROTOCOL_BY_DRIVER

+                  );

+  if (EFI_ERROR (Status)) {

+    //

+    // On failure, destroy the ip child.

+    //

+    NetLibDestroyServiceChild (

+      ControllerHandle,

+      ImageHandle,

+      &gEfiIp4ServiceBindingProtocolGuid,

+      *ChildHandle

+      );

+  }

+

+  return Status;

+}

+

+

+/**

+  This function close the previously openned ip protocol and destroy the ip child.

+

+  @param  ControllerHandle      The controller handle.

+  @param  ImageHandle           the image handle.

+  @param  ChildHandle           The child handle of the ip child.

+

+  @retval EFI_SUCCESS           The ip protocol is closed and the relevant ip child

+                                is destroyed.

+  @retval other                 The required operation failed.

+

+**/

+STATIC

+EFI_STATUS

+IpIoCloseProtocolDestroyIpChild (

+  IN EFI_HANDLE  ControllerHandle,

+  IN EFI_HANDLE  ImageHandle,

+  IN EFI_HANDLE  ChildHandle

+  )

+{

+  EFI_STATUS  Status;

+

+  //

+  // Close the previously openned ip protocol.

+  //

+  gBS->CloseProtocol (

+         ChildHandle,

+         &gEfiIp4ProtocolGuid,

+         ImageHandle,

+         ControllerHandle

+         );

+

+  //

+  // Destroy the ip child.

+  //

+  Status = NetLibDestroyServiceChild (

+             ControllerHandle,

+             ImageHandle,

+             &gEfiIp4ServiceBindingProtocolGuid,

+             ChildHandle

+             );

+

+  return Status;

+}

+

+

+/**

+  Handle ICMP packets.

+

+  @param  IpIo                  Pointer to the IP_IO instance.

+  @param  Pkt                   Pointer to the ICMP packet.

+  @param  Session               Pointer to the net session of this ICMP packet.

+

+  @retval EFI_SUCCESS           The ICMP packet is handled successfully.

+  @retval EFI_ABORTED           This type of ICMP packet is not supported.

+

+**/

+STATIC

+EFI_STATUS

+IpIoIcmpHandler (

+  IN IP_IO                *IpIo,

+  IN NET_BUF              *Pkt,

+  IN EFI_NET_SESSION_DATA *Session

+  )

+{

+  IP4_ICMP_ERROR_HEAD  *IcmpHdr;

+  EFI_IP4_HEADER       *IpHdr;

+  ICMP_ERROR           IcmpErr;

+  UINT8                *PayLoadHdr;

+  UINT8                Type;

+  UINT8                Code;

+  UINT32               TrimBytes;

+

+  IcmpHdr = NET_PROTO_HDR (Pkt, IP4_ICMP_ERROR_HEAD);

+  IpHdr   = (EFI_IP4_HEADER *) (&IcmpHdr->IpHead);

+

+  //

+  // Check the ICMP packet length.

+  //

+  if (Pkt->TotalSize < ICMP_ERRLEN (IpHdr)) {

+

+    return EFI_ABORTED;

+  }

+

+  Type = IcmpHdr->Head.Type;

+  Code = IcmpHdr->Head.Code;

+

+  //

+  // Analyze the ICMP Error in this ICMP pkt

+  //

+  switch (Type) {

+  case ICMP_TYPE_UNREACH:

+    switch (Code) {

+    case ICMP_CODE_UNREACH_NET:

+    case ICMP_CODE_UNREACH_HOST:

+    case ICMP_CODE_UNREACH_PROTOCOL:

+    case ICMP_CODE_UNREACH_PORT:

+    case ICMP_CODE_UNREACH_SRCFAIL:

+      IcmpErr = ICMP_ERR_UNREACH_NET + Code;

+

+      break;

+

+    case ICMP_CODE_UNREACH_NEEDFRAG:

+      IcmpErr = ICMP_ERR_MSGSIZE;

+

+      break;

+

+    case ICMP_CODE_UNREACH_NET_UNKNOWN:

+    case ICMP_CODE_UNREACH_NET_PROHIB:

+    case ICMP_CODE_UNREACH_TOSNET:

+      IcmpErr = ICMP_ERR_UNREACH_NET;

+

+      break;

+

+    case ICMP_CODE_UNREACH_HOST_UNKNOWN:

+    case ICMP_CODE_UNREACH_ISOLATED:

+    case ICMP_CODE_UNREACH_HOST_PROHIB:

+    case ICMP_CODE_UNREACH_TOSHOST:

+      IcmpErr = ICMP_ERR_UNREACH_HOST;

+

+      break;

+

+    default:

+      return EFI_ABORTED;

+

+      break;

+    }

+

+    break;

+

+  case ICMP_TYPE_TIMXCEED:

+    if (Code > 1) {

+      return EFI_ABORTED;

+    }

+

+    IcmpErr = Code + ICMP_ERR_TIMXCEED_INTRANS;

+

+    break;

+

+  case ICMP_TYPE_PARAMPROB:

+    if (Code > 1) {

+      return EFI_ABORTED;

+    }

+

+    IcmpErr = ICMP_ERR_PARAMPROB;

+

+    break;

+

+  case ICMP_TYPE_SOURCEQUENCH:

+    if (Code != 0) {

+      return EFI_ABORTED;

+    }

+

+    IcmpErr = ICMP_ERR_QUENCH;

+

+    break;

+

+  default:

+    return EFI_ABORTED;

+

+    break;

+  }

+

+  //

+  // Notify user the ICMP pkt only containing payload except

+  // IP and ICMP header

+  //

+  PayLoadHdr = (UINT8 *) ((UINT8 *) IpHdr + EFI_IP4_HEADER_LEN (IpHdr));

+  TrimBytes  = (UINT32) (PayLoadHdr - (UINT8 *) IcmpHdr);

+

+  NetbufTrim (Pkt, TrimBytes, TRUE);

+

+  IpIo->PktRcvdNotify (EFI_ICMP_ERROR, IcmpErr, Session, Pkt, IpIo->RcvdContext);

+

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Ext free function for net buffer. This function is

+  called when the net buffer is freed. It is used to

+  signal the recycle event to notify IP to recycle the

+  data buffer.

+

+  @param  Event                 The event to be signaled.

+

+  @return None.

+

+**/

+STATIC

+VOID

+IpIoExtFree (

+  IN VOID  *Event

+  )

+{

+  gBS->SignalEvent ((EFI_EVENT) Event);

+}

+

+

+/**

+  Create a send entry to wrap a packet before sending

+  out it through IP.

+

+  @param  IpIo                  Pointer to the IP_IO instance.

+  @param  Pkt                   Pointer to the packet.

+  @param  Sender                Pointer to the IP sender.

+  @param  NotifyData            Pointer to the notify data.

+  @param  Dest                  Pointer to the destination IP address.

+  @param  Override              Pointer to the overriden IP_IO data.

+

+  @return Pointer to the data structure created to wrap the packet. If NULL,

+  @return resource limit occurred.

+

+**/

+STATIC

+IP_IO_SEND_ENTRY *

+IpIoCreateSndEntry (

+  IN IP_IO             *IpIo,

+  IN NET_BUF           *Pkt,

+  IN EFI_IP4_PROTOCOL  *Sender,

+  IN VOID              *Context    OPTIONAL,

+  IN VOID              *NotifyData OPTIONAL,

+  IN IP4_ADDR          Dest,

+  IN IP_IO_OVERRIDE    *Override

+  )

+{

+  IP_IO_SEND_ENTRY          *SndEntry;

+  EFI_IP4_COMPLETION_TOKEN  *SndToken;

+  EFI_IP4_TRANSMIT_DATA     *TxData;

+  EFI_STATUS                Status;

+  EFI_IP4_OVERRIDE_DATA     *OverrideData;

+  UINT32                    Index;

+

+  //

+  // Allocate resource for SndEntry

+  //

+  SndEntry = NetAllocatePool (sizeof (IP_IO_SEND_ENTRY));

+  if (NULL == SndEntry) {

+    return NULL;

+  }

+

+  //

+  // Allocate resource for SndToken

+  //

+  SndToken = NetAllocatePool (sizeof (EFI_IP4_COMPLETION_TOKEN));

+  if (NULL == SndToken) {

+    goto ReleaseSndEntry;

+  }

+

+  Status = gBS->CreateEvent (

+                  EVT_NOTIFY_SIGNAL,

+                  NET_TPL_EVENT,

+                  IpIoTransmitHandler,

+                  SndEntry,

+                  &(SndToken->Event)

+                  );

+  if (EFI_ERROR (Status)) {

+    goto ReleaseSndToken;

+  }

+

+  //

+  // Allocate resource for TxData

+  //

+  TxData = NetAllocatePool (

+    sizeof (EFI_IP4_TRANSMIT_DATA) +

+    sizeof (EFI_IP4_FRAGMENT_DATA) * (Pkt->BlockOpNum - 1)

+    );

+

+  if (NULL == TxData) {

+    goto ReleaseEvent;

+  }

+

+  //

+  // Allocate resource for OverrideData if needed

+  //

+  OverrideData = NULL;

+  if (NULL != Override) {

+

+    OverrideData = NetAllocatePool (sizeof (EFI_IP4_OVERRIDE_DATA));

+    if (NULL == OverrideData) {

+      goto ReleaseResource;

+    }

+    //

+    // Set the fields of OverrideData

+    //

+    *OverrideData = * (EFI_IP4_OVERRIDE_DATA *) Override;

+  }

+

+  //

+  // Set the fields of TxData

+  //

+  EFI_IP4 (TxData->DestinationAddress)  = Dest;

+  TxData->OverrideData                  = OverrideData;

+  TxData->OptionsLength                 = 0;

+  TxData->OptionsBuffer                 = NULL;

+  TxData->TotalDataLength               = Pkt->TotalSize;

+  TxData->FragmentCount                 = Pkt->BlockOpNum;

+

+  for (Index = 0; Index < Pkt->BlockOpNum; Index++) {

+

+    TxData->FragmentTable[Index].FragmentBuffer = Pkt->BlockOp[Index].Head;

+    TxData->FragmentTable[Index].FragmentLength = Pkt->BlockOp[Index].Size;

+  }

+

+  //

+  // Set the fields of SndToken

+  //

+  SndToken->Packet.TxData = TxData;

+

+  //

+  // Set the fields of SndEntry

+  //

+  SndEntry->IpIo        = IpIo;

+  SndEntry->Ip      = Sender;

+  SndEntry->Context     = Context;

+  SndEntry->NotifyData  = NotifyData;

+

+  SndEntry->Pkt         = Pkt;

+  NET_GET_REF (Pkt);

+

+  SndEntry->SndToken = SndToken;

+

+  NetListInsertTail (&IpIo->PendingSndList, &SndEntry->Entry);

+

+  return SndEntry;

+

+ReleaseResource:

+  NetFreePool (TxData);

+

+ReleaseEvent:

+  gBS->CloseEvent (SndToken->Event);

+

+ReleaseSndToken:

+  NetFreePool (SndToken);

+

+ReleaseSndEntry:

+  NetFreePool (SndEntry);

+

+  return NULL;

+}

+

+

+/**

+  Destroy the SndEntry.

+

+  @param  SndEntry              Pointer to the send entry to be destroyed.

+

+  @return None.

+

+**/

+STATIC

+VOID

+IpIoDestroySndEntry (

+  IN IP_IO_SEND_ENTRY  *SndEntry

+  )

+{

+  EFI_IP4_TRANSMIT_DATA  *TxData;

+

+  TxData = SndEntry->SndToken->Packet.TxData;

+

+  if (NULL != TxData->OverrideData) {

+    NetFreePool (TxData->OverrideData);

+  }

+

+  NetFreePool (TxData);

+  NetbufFree (SndEntry->Pkt);

+  gBS->CloseEvent (SndEntry->SndToken->Event);

+

+  NetFreePool (SndEntry->SndToken);

+  NetListRemoveEntry (&SndEntry->Entry);

+

+  NetFreePool (SndEntry);

+}

+

+

+/**

+  Notify function for IP transmit token.

+

+  @param  Event                 The event signaled.

+  @param  Context               The context passed in by the event notifier.

+

+  @return None.

+

+**/

+STATIC

+VOID

+EFIAPI

+IpIoTransmitHandler (

+  IN EFI_EVENT Event,

+  IN VOID      *Context

+  )

+{

+  IP_IO             *IpIo;

+  IP_IO_SEND_ENTRY  *SndEntry;

+

+  SndEntry  = (IP_IO_SEND_ENTRY *) Context;

+

+  IpIo      = SndEntry->IpIo;

+

+  if (IpIo->PktSentNotify && SndEntry->NotifyData) {

+    IpIo->PktSentNotify (

+            SndEntry->SndToken->Status,

+            SndEntry->Context,

+            SndEntry->Ip,

+            SndEntry->NotifyData

+            );

+  }

+

+  IpIoDestroySndEntry (SndEntry);

+}

+

+

+/**

+  The dummy handler for the dummy IP receive token.

+

+  @param  Evt                   The event signaled.

+  @param  Context               The context passed in by the event notifier.

+

+  @return None.

+

+**/

+STATIC

+VOID

+EFIAPI

+IpIoDummyHandler (

+  IN EFI_EVENT Event,

+  IN VOID      *Context

+  )

+{

+  IP_IO_IP_INFO             *IpInfo;

+  EFI_IP4_COMPLETION_TOKEN  *DummyToken;

+

+  ASSERT (Event && Context);

+

+  IpInfo      = (IP_IO_IP_INFO *) Context;

+  DummyToken  = &(IpInfo->DummyRcvToken);

+

+  if (EFI_SUCCESS == DummyToken->Status) {

+    ASSERT (DummyToken->Packet.RxData);

+

+    gBS->SignalEvent (DummyToken->Packet.RxData->RecycleSignal);

+  }

+

+  IpInfo->Ip->Receive (IpInfo->Ip, DummyToken);

+}

+

+

+/**

+  Notify function for the IP receive token, used to process

+  the received IP packets.

+

+  @param  Event                 The event signaled.

+  @param  Context               The context passed in by the event notifier.

+

+  @return None.

+

+**/

+STATIC

+VOID

+EFIAPI

+IpIoListenHandler (

+  IN EFI_EVENT Event,

+  IN VOID      *Context

+  )

+{

+  IP_IO                 *IpIo;

+  EFI_STATUS            Status;

+  EFI_IP4_RECEIVE_DATA  *RxData;

+  EFI_IP4_PROTOCOL      *Ip;

+  EFI_NET_SESSION_DATA  Session;

+  NET_BUF               *Pkt;

+

+  IpIo    = (IP_IO *) Context;

+

+  Ip      = IpIo->Ip;

+  Status  = IpIo->RcvToken.Status;

+  RxData  = IpIo->RcvToken.Packet.RxData;

+

+  if (((EFI_SUCCESS != Status) && (EFI_ICMP_ERROR != Status)) || (NULL == RxData)) {

+    //

+    // Only process the normal packets and the icmp error packets, if RxData is NULL

+    // with Status == EFI_SUCCESS or EFI_ICMP_ERROR, just resume the receive although

+    // this should be a bug of the low layer (IP).

+    //

+    goto Resume;

+  }

+

+  if (NULL == IpIo->PktRcvdNotify) {

+    goto CleanUp;

+  }

+

+  if ((EFI_IP4 (RxData->Header->SourceAddress) != 0) &&

+    !Ip4IsUnicast (EFI_NTOHL (RxData->Header->SourceAddress), 0)) {

+    //

+    // The source address is not zero and it's not a unicast IP address, discard it.

+    //

+    goto CleanUp;

+  }

+

+  //

+  // Create a netbuffer representing packet

+  //

+  Pkt = NetbufFromExt (

+          (NET_FRAGMENT *) RxData->FragmentTable,

+          RxData->FragmentCount,

+          0,

+          0,

+          IpIoExtFree,

+          RxData->RecycleSignal

+          );

+  if (NULL == Pkt) {

+    goto CleanUp;

+  }

+

+  //

+  // Create a net session

+  //

+  Session.Source = EFI_IP4 (RxData->Header->SourceAddress);

+  Session.Dest   = EFI_IP4 (RxData->Header->DestinationAddress);

+  Session.IpHdr  = RxData->Header;

+

+  if (EFI_SUCCESS == Status) {

+

+    IpIo->PktRcvdNotify (EFI_SUCCESS, 0, &Session, Pkt, IpIo->RcvdContext);

+  } else {

+    //

+    // Status is EFI_ICMP_ERROR

+    //

+    Status = IpIoIcmpHandler (IpIo, Pkt, &Session);

+    if (EFI_ERROR (Status)) {

+      NetbufFree (Pkt);

+    }

+  }

+

+  goto Resume;

+

+CleanUp:

+  gBS->SignalEvent (RxData->RecycleSignal);

+

+Resume:

+  Ip->Receive (Ip, &(IpIo->RcvToken));

+}

+

+

+/**

+  Create a new IP_IO instance.

+

+  @param  Image                 The image handle of an IP_IO consumer protocol.

+  @param  Controller            The controller handle of an IP_IO consumer protocol

+                                installed on.

+

+  @return Pointer to a newly created IP_IO instance.

+

+**/

+IP_IO *

+IpIoCreate (

+  IN EFI_HANDLE Image,

+  IN EFI_HANDLE Controller

+  )

+{

+  EFI_STATUS  Status;

+  IP_IO       *IpIo;

+

+  IpIo = NetAllocateZeroPool (sizeof (IP_IO));

+  if (NULL == IpIo) {

+    return NULL;

+  }

+

+  NetListInit (&(IpIo->PendingSndList));

+  NetListInit (&(IpIo->IpList));

+  IpIo->Controller  = Controller;

+  IpIo->Image       = Image;

+

+  Status = gBS->CreateEvent (

+                  EVT_NOTIFY_SIGNAL,

+                  NET_TPL_EVENT,

+                  IpIoListenHandler,

+                  IpIo,

+                  &(IpIo->RcvToken.Event)

+                  );

+  if (EFI_ERROR (Status)) {

+    goto ReleaseIpIo;

+  }

+

+  //

+  // Create an IP child and open IP protocol

+  //

+  Status = IpIoCreateIpChildOpenProtocol (

+             Controller,

+             Image,

+             &IpIo->ChildHandle,

+             (VOID **)&(IpIo->Ip)

+             );

+  if (EFI_ERROR (Status)) {

+    goto ReleaseIpIo;

+  }

+

+  return IpIo;

+

+ReleaseIpIo:

+

+  if (NULL != IpIo->RcvToken.Event) {

+    gBS->CloseEvent (IpIo->RcvToken.Event);

+  }

+

+  NetFreePool (IpIo);

+

+  return NULL;

+}

+

+

+/**

+  Open an IP_IO instance for use.

+

+  @param  IpIo                  Pointer to an IP_IO instance that needs to open.

+  @param  OpenData              The configuration data for the IP_IO instance.

+

+  @retval EFI_SUCCESS           The IP_IO instance opened with OpenData

+                                successfully.

+  @retval other                 Error condition occurred.

+

+**/

+EFI_STATUS

+IpIoOpen (

+  IN IP_IO           *IpIo,

+  IN IP_IO_OPEN_DATA *OpenData

+  )

+{

+  EFI_STATUS        Status;

+  EFI_IP4_PROTOCOL  *Ip;

+  EFI_IPv4_ADDRESS  ZeroIp;

+

+  if (IpIo->IsConfigured) {

+    return EFI_ACCESS_DENIED;

+  }

+

+  Ip = IpIo->Ip;

+

+  //

+  // configure ip

+  //

+  Status = Ip->Configure (Ip, &OpenData->IpConfigData);

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  //

+  // bugbug: to delete the default route entry in this Ip, if it is:

+  // (0.0.0.0, 0.0.0.0, 0.0.0.0). Delete this statement if Ip modified

+  // its code

+  //

+  EFI_IP4 (ZeroIp) = 0;

+  Status = Ip->Routes (Ip, TRUE, &ZeroIp, &ZeroIp, &ZeroIp);

+

+  if (EFI_ERROR (Status) && (EFI_NOT_FOUND != Status)) {

+    return Status;

+  }

+

+  IpIo->PktRcvdNotify = OpenData->PktRcvdNotify;

+  IpIo->PktSentNotify = OpenData->PktSentNotify;

+

+  IpIo->RcvdContext   = OpenData->RcvdContext;

+  IpIo->SndContext    = OpenData->SndContext;

+

+  IpIo->Protocol      = OpenData->IpConfigData.DefaultProtocol;

+

+  //

+  // start to listen incoming packet

+  //

+  Status = Ip->Receive (Ip, &(IpIo->RcvToken));

+  if (EFI_ERROR (Status)) {

+    Ip->Configure (Ip, NULL);

+    goto ErrorExit;

+  }

+

+  IpIo->IsConfigured = TRUE;

+  NetListInsertTail (&mActiveIpIoList, &IpIo->Entry);

+

+ErrorExit:

+

+  return Status;

+}

+

+

+/**

+  Stop an IP_IO instance.

+

+  @param  IpIo                  Pointer to the IP_IO instance that needs to stop.

+

+  @retval EFI_SUCCESS           The IP_IO instance stopped successfully.

+  @retval other                 Error condition occurred.

+

+**/

+EFI_STATUS

+IpIoStop (

+  IN IP_IO *IpIo

+  )

+{

+  EFI_STATUS        Status;

+  EFI_IP4_PROTOCOL  *Ip;

+  IP_IO_IP_INFO     *IpInfo;

+

+  if (!IpIo->IsConfigured) {

+    return EFI_SUCCESS;

+  }

+

+  //

+  // Remove the IpIo from the active IpIo list.

+  //

+  NetListRemoveEntry (&IpIo->Entry);

+

+  Ip = IpIo->Ip;

+

+  //

+  // Configure NULL Ip

+  //

+  Status = Ip->Configure (Ip, NULL);

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  IpIo->IsConfigured = FALSE;

+

+  //

+  // Detroy the Ip List used by IpIo

+  //

+  while (!NetListIsEmpty (&(IpIo->IpList))) {

+    IpInfo = NET_LIST_HEAD (&(IpIo->IpList), IP_IO_IP_INFO, Entry);

+

+    IpIoRemoveIp (IpIo, IpInfo);

+  }

+

+  //

+  // All pending snd tokens should be flushed by reseting the IP instances.

+  //

+  ASSERT (NetListIsEmpty (&IpIo->PendingSndList));

+

+  //

+  // Close the receive event.

+  //

+  gBS->CloseEvent (IpIo->RcvToken.Event);

+

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Destroy an IP_IO instance.

+

+  @param  IpIo                  Pointer to the IP_IO instance that needs to

+                                destroy.

+

+  @retval EFI_SUCCESS           The IP_IO instance destroyed successfully.

+  @retval other                 Error condition occurred.

+

+**/

+EFI_STATUS

+IpIoDestroy (

+  IN IP_IO *IpIo

+  )

+{

+  //

+  // Stop the IpIo.

+  //

+  IpIoStop (IpIo);

+

+  //

+  // Close the IP protocol and destroy the child.

+  //

+  IpIoCloseProtocolDestroyIpChild (IpIo->Controller, IpIo->Image, IpIo->ChildHandle);

+

+  NetFreePool (IpIo);

+

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Send out an IP packet.

+

+  @param  IpIo                  Pointer to an IP_IO instance used for sending IP

+                                packet.

+  @param  Pkt                   Pointer to the IP packet to be sent.

+  @param  Sender                The IP protocol instance used for sending.

+  @param  NotifyData

+  @param  Dest                  The destination IP address to send this packet to.

+  @param  OverrideData          The data to override some configuration of the IP

+                                instance used for sending.

+

+  @retval EFI_SUCCESS           The operation is completed successfully.

+  @retval EFI_NOT_STARTED       The IpIo is not configured.

+  @retval EFI_OUT_OF_RESOURCES  Failed due to resource limit.

+

+**/

+EFI_STATUS

+IpIoSend (

+  IN IP_IO           *IpIo,

+  IN NET_BUF         *Pkt,

+  IN IP_IO_IP_INFO   *Sender,

+  IN VOID            *Context    OPTIONAL,

+  IN VOID            *NotifyData OPTIONAL,

+  IN IP4_ADDR        Dest,

+  IN IP_IO_OVERRIDE  *OverrideData

+  )

+{

+  EFI_STATUS        Status;

+  EFI_IP4_PROTOCOL  *Ip;

+  IP_IO_SEND_ENTRY  *SndEntry;

+

+  if (!IpIo->IsConfigured) {

+    return EFI_NOT_STARTED;

+  }

+

+  Ip = (NULL == Sender) ? IpIo->Ip : Sender->Ip;

+

+  //

+  // create a new SndEntry

+  //

+  SndEntry = IpIoCreateSndEntry (IpIo, Pkt, Ip, Context, NotifyData, Dest, OverrideData);

+  if (NULL == SndEntry) {

+    return EFI_OUT_OF_RESOURCES;

+  }

+

+  //

+  // Send this Packet

+  //

+  Status = Ip->Transmit (Ip, SndEntry->SndToken);

+  if (EFI_ERROR (Status)) {

+    IpIoDestroySndEntry (SndEntry);

+  }

+

+  return Status;

+}

+

+

+/**

+  Cancel the IP transmit token which wraps this Packet.

+

+  @param  IpIo                  Pointer to the IP_IO instance.

+  @param  Packet                Pointer to the packet to cancel.

+

+  @return N/A.

+

+**/

+VOID

+IpIoCancelTxToken (

+  IN IP_IO  *IpIo,

+  IN VOID   *Packet

+  )

+{

+  NET_LIST_ENTRY    *Node;

+  IP_IO_SEND_ENTRY  *SndEntry;

+  EFI_IP4_PROTOCOL  *Ip;

+

+  ASSERT (IpIo && Packet);

+

+  NET_LIST_FOR_EACH (Node, &IpIo->PendingSndList) {

+

+    SndEntry = NET_LIST_USER_STRUCT (Node, IP_IO_SEND_ENTRY, Entry);

+

+    if (SndEntry->Pkt == Packet) {

+

+      Ip = SndEntry->Ip;

+      Ip->Cancel (Ip, SndEntry->SndToken);

+

+      //

+      // Abort the user token.

+      //

+      SndEntry->SndToken->Status = EFI_ABORTED;

+      IpIoTransmitHandler (NULL, SndEntry);

+

+      break;

+    }

+  }

+

+}

+

+

+/**

+  Add a new IP instance for sending data.

+

+  @param  IpIo                  Pointer to a IP_IO instance to add a new IP

+                                instance for sending purpose.

+

+  @return Pointer to the created IP_IO_IP_INFO structure, NULL is failed.

+

+**/

+IP_IO_IP_INFO *

+IpIoAddIp (

+  IN IP_IO  *IpIo

+  )

+{

+  EFI_STATUS     Status;

+  IP_IO_IP_INFO  *IpInfo;

+

+  ASSERT (IpIo);

+

+  IpInfo = NetAllocatePool (sizeof (IP_IO_IP_INFO));

+  if (IpInfo == NULL) {

+    return IpInfo;

+  }

+

+  //

+  // Init this IpInfo, set the Addr and SubnetMask to 0 before we configure the IP

+  // instance.

+  //

+  NetListInit (&IpInfo->Entry);

+  IpInfo->ChildHandle = NULL;

+  IpInfo->Addr        = 0;

+  IpInfo->SubnetMask  = 0;

+  IpInfo->RefCnt      = 1;

+

+  //

+  // Create the IP instance and open the Ip4 protocol.

+  //

+  Status = IpIoCreateIpChildOpenProtocol (

+             IpIo->Controller,

+             IpIo->Image,

+             &IpInfo->ChildHandle,

+             &IpInfo->Ip

+             );

+  if (EFI_ERROR (Status)) {

+    goto ReleaseIpInfo;

+  }

+

+  //

+  // Create the event for the DummyRcvToken.

+  //

+  Status = gBS->CreateEvent (

+                  EVT_NOTIFY_SIGNAL,

+                  NET_TPL_EVENT,

+                  IpIoDummyHandler,

+                  IpInfo,

+                  &IpInfo->DummyRcvToken.Event

+                  );

+  if (EFI_ERROR (Status)) {

+    goto ReleaseIpChild;

+  }

+

+  //

+  // Link this IpInfo into the IpIo.

+  //

+  NetListInsertTail (&IpIo->IpList, &IpInfo->Entry);

+

+  return IpInfo;

+

+ReleaseIpChild:

+

+  IpIoCloseProtocolDestroyIpChild (

+    IpIo->Controller,

+    IpIo->Image,

+    IpInfo->ChildHandle

+    );

+

+ReleaseIpInfo:

+

+  NetFreePool (IpInfo);

+

+  return NULL;

+}

+

+

+/**

+  Configure the IP instance of this IpInfo and start the receiving if Ip4ConfigData

+  is not NULL.

+

+  @param  IpInfo                Pointer to the IP_IO_IP_INFO instance.

+  @param  Ip4ConfigData         The IP4 configure data used to configure the ip

+                                instance, if NULL the ip instance is reseted. If

+                                UseDefaultAddress is set to TRUE, and the configure

+                                operation succeeds, the default address information

+                                is written back in this Ip4ConfigData.

+

+  @retval EFI_STATUS            The status returned by IP4->Configure or

+                                IP4->Receive.

+

+**/

+EFI_STATUS

+IpIoConfigIp (

+  IN     IP_IO_IP_INFO        *IpInfo,

+  IN OUT EFI_IP4_CONFIG_DATA  *Ip4ConfigData OPTIONAL

+  )

+{

+  EFI_STATUS         Status;

+  EFI_IP4_PROTOCOL   *Ip;

+  EFI_IP4_MODE_DATA  Ip4ModeData;

+

+  ASSERT (IpInfo);

+

+  if (IpInfo->RefCnt > 1) {

+    //

+    // This IP instance is shared, don't reconfigure it until it has only one

+    // consumer. Currently, only the tcp children cloned from their passive parent

+    // will share the same IP. So this cases only happens while Ip4ConfigData is NULL,

+    // let the last consumer clean the IP instance.

+    //

+    return EFI_SUCCESS;

+  }

+

+  Ip = IpInfo->Ip;

+

+  Status = Ip->Configure (Ip, Ip4ConfigData);

+  if (EFI_ERROR (Status)) {

+    goto OnExit;

+  }

+

+  if (Ip4ConfigData != NULL) {

+

+    if (Ip4ConfigData->UseDefaultAddress) {

+      Ip->GetModeData (Ip, &Ip4ModeData, NULL, NULL);

+

+      Ip4ConfigData->StationAddress = Ip4ModeData.ConfigData.StationAddress;

+      Ip4ConfigData->SubnetMask     = Ip4ModeData.ConfigData.SubnetMask;

+    }

+

+    IpInfo->Addr       = EFI_IP4 (Ip4ConfigData->StationAddress);

+    IpInfo->SubnetMask = EFI_IP4 (Ip4ConfigData->SubnetMask);

+

+    Status = Ip->Receive (Ip, &IpInfo->DummyRcvToken);

+    if (EFI_ERROR (Status)) {

+      Ip->Configure (Ip, NULL);

+    }

+  } else {

+

+    //

+    // The IP instance is reseted, set the stored Addr and SubnetMask to zero.

+    //

+    IpInfo->Addr       = 0;

+    IpInfo->SubnetMask =0;

+  }

+

+OnExit:

+

+  return Status;

+}

+

+

+/**

+  Destroy an IP instance maintained in IpIo->IpList for

+  sending purpose.

+

+  @param  IpIo                  Pointer to the IP_IO instance.

+  @param  IpInfo                Pointer to the IpInfo to be removed.

+

+  @return None.

+

+**/

+VOID

+IpIoRemoveIp (

+  IN IP_IO          *IpIo,

+  IN IP_IO_IP_INFO  *IpInfo

+  )

+{

+  ASSERT (IpInfo->RefCnt > 0);

+

+  NET_PUT_REF (IpInfo);

+

+  if (IpInfo->RefCnt > 0) {

+

+    return;

+  }

+

+  NetListRemoveEntry (&IpInfo->Entry);

+

+  IpInfo->Ip->Configure (IpInfo->Ip, NULL);

+

+  IpIoCloseProtocolDestroyIpChild (IpIo->Controller, IpIo->Image, IpInfo->ChildHandle);

+

+  gBS->CloseEvent (IpInfo->DummyRcvToken.Event);

+

+  NetFreePool (IpInfo);

+}

+

+

+/**

+  Find the first IP protocol maintained in IpIo whose local

+  address is the same with Src.

+

+  @param  IpIo                  Pointer to the pointer of the IP_IO instance.

+  @param  Src                   The local IP address.

+

+  @return Pointer to the IP protocol can be used for sending purpose and its local

+  @return address is the same with Src.

+

+**/

+IP_IO_IP_INFO *

+IpIoFindSender (

+  IN OUT IP_IO     **IpIo,

+  IN     IP4_ADDR  Src

+  )

+{

+  NET_LIST_ENTRY  *IpIoEntry;

+  IP_IO           *IpIoPtr;

+  NET_LIST_ENTRY  *IpInfoEntry;

+  IP_IO_IP_INFO   *IpInfo;

+

+  NET_LIST_FOR_EACH (IpIoEntry, &mActiveIpIoList) {

+    IpIoPtr = NET_LIST_USER_STRUCT (IpIoEntry, IP_IO, Entry);

+

+    if ((*IpIo != NULL) && (*IpIo != IpIoPtr)) {

+      continue;

+    }

+

+    NET_LIST_FOR_EACH (IpInfoEntry, &IpIoPtr->IpList) {

+      IpInfo = NET_LIST_USER_STRUCT (IpInfoEntry, IP_IO_IP_INFO, Entry);

+

+      if (IpInfo->Addr == Src) {

+        *IpIo = IpIoPtr;

+        return IpInfo;

+      }

+    }

+  }

+

+  //

+  // No match.

+  //

+  return NULL;

+}

+

+

+/**

+  Get the ICMP error map information, the ErrorStatus will be returned.

+  The IsHard and Notify are optional. If they are not NULL, this rouine will

+  fill them.

+  We move IcmpErrMap[] to local variable to enable EBC build.

+

+  @param  IcmpError             IcmpError Type

+  @param  IsHard                Whether it is a hard error

+  @param  Notify                Whether it need to notify SockError

+

+  @return ICMP Error Status

+

+**/

+EFI_STATUS

+IpIoGetIcmpErrStatus (

+  IN  ICMP_ERROR  IcmpError,

+  OUT BOOLEAN     *IsHard, OPTIONAL

+  OUT BOOLEAN     *Notify OPTIONAL

+  )

+{

+  ICMP_ERROR_INFO  IcmpErrMap[] = {

+    { EFI_NETWORK_UNREACHABLE,  FALSE, TRUE  }, // ICMP_ERR_UNREACH_NET

+    { EFI_HOST_UNREACHABLE,     FALSE, TRUE  }, // ICMP_ERR_UNREACH_HOST

+    { EFI_PROTOCOL_UNREACHABLE, TRUE,  TRUE  }, // ICMP_ERR_UNREACH_PROTOCOL

+    { EFI_PORT_UNREACHABLE,     TRUE,  TRUE  }, // ICMP_ERR_UNREACH_PORT

+    { EFI_ICMP_ERROR,           TRUE,  TRUE  }, // ICMP_ERR_MSGSIZE

+    { EFI_ICMP_ERROR,           FALSE, TRUE  }, // ICMP_ERR_UNREACH_SRCFAIL

+    { EFI_HOST_UNREACHABLE,     FALSE, TRUE  }, // ICMP_ERR_TIMXCEED_INTRANS

+    { EFI_HOST_UNREACHABLE,     FALSE, TRUE  }, // ICMP_ERR_TIMEXCEED_REASS

+    { EFI_ICMP_ERROR,           FALSE, FALSE }, // ICMP_ERR_QUENCH

+    { EFI_ICMP_ERROR,           FALSE, TRUE  }  // ICMP_ERR_PARAMPROB

+  };

+

+  ASSERT ((IcmpError >= ICMP_ERR_UNREACH_NET) && (IcmpError <= ICMP_ERR_PARAMPROB));

+

+  if (IsHard != NULL) {

+    *IsHard = IcmpErrMap[IcmpError].IsHard;

+  }

+

+  if (Notify != NULL) {

+    *Notify = IcmpErrMap[IcmpError].Notify;

+  }

+

+  return IcmpErrMap[IcmpError].Error;

+}

+

diff --git a/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.inf b/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.inf
new file mode 100644
index 0000000000..9430d8abba
--- /dev/null
+++ b/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.inf
@@ -0,0 +1,65 @@
+#/** @file

+# Component name for module NetLib

+#

+# FIX ME!

+# Copyright (c) 2006, Intel Corporation. All right reserved.

+#

+#  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.

+#

+#

+#**/

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = NetIpIoDxe

+  FILE_GUID                      = A302F877-8625-425c-B1EC-7487B62C4FDA

+  MODULE_TYPE                    = DXE_DRIVER

+  VERSION_STRING                 = 1.0

+  LIBRARY_CLASS                  = IpIoLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER

+  EDK_RELEASE_VERSION            = 0x00020000

+  EFI_SPECIFICATION_VERSION      = 0x00020000

+

+

+#

+# The following information is for reference only and not required by the build tools.

+#

+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC

+#

+

+[Sources.common]

+  DxeIpIoLib.c

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+

+

+[LibraryClasses]

+  MemoryAllocationLib

+  UefiLib

+  BaseLib

+  UefiBootServicesTableLib

+  UefiRuntimeServicesTableLib

+  BaseMemoryLib

+  DebugLib

+  PrintLib

+

+

+[Protocols]

+  gEfiIp4ProtocolGuid                           # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverDiagnosticsProtocolGuid             # PROTOCOL ALWAYS_CONSUMED

+  gEfiUdp4ServiceBindingProtocolGuid            # PROTOCOL ALWAYS_CONSUMED

+  gEfiLoadedImageProtocolGuid                   # PROTOCOL ALWAYS_CONSUMED

+  gEfiIp4ServiceBindingProtocolGuid             # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverConfigurationProtocolGuid           # PROTOCOL ALWAYS_CONSUMED

+  gEfiSimpleNetworkProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverBindingProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+  gEfiUdp4ProtocolGuid                          # PROTOCOL ALWAYS_CONSUMED

+  gEfiComponentNameProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+

diff --git a/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
new file mode 100644
index 0000000000..88dcf76a05
--- /dev/null
+++ b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.c
@@ -0,0 +1,1332 @@
+/** @file
+
+Copyright (c) 2005 - 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:
+
+  NetLib.c
+
+Abstract:
+
+
+
+**/
+
+#include <PiDxe.h>
+
+#include <Protocol/ServiceBinding.h>
+#include <Protocol/SimpleNetwork.h>
+#include <Protocol/LoadedImage.h>
+
+#include <Library/NetLib.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/UefiLib.h>

+#include <Library/MemoryAllocationLib.h>
+
+
+//
+// All the supported IP4 maskes in host byte order.
+//
+IP4_ADDR  mIp4AllMasks[IP4_MASK_NUM] = {
+  0x00000000,
+  0x80000000,
+  0xC0000000,
+  0xE0000000,
+  0xF0000000,
+  0xF8000000,
+  0xFC000000,
+  0xFE000000,
+
+  0xFF000000,
+  0xFF800000,
+  0xFFC00000,
+  0xFFE00000,
+  0xFFF00000,
+  0xFFF80000,
+  0xFFFC0000,
+  0xFFFE0000,
+
+  0xFFFF0000,
+  0xFFFF8000,
+  0xFFFFC000,
+  0xFFFFE000,
+  0xFFFFF000,
+  0xFFFFF800,
+  0xFFFFFC00,
+  0xFFFFFE00,
+
+  0xFFFFFF00,
+  0xFFFFFF80,
+  0xFFFFFFC0,
+  0xFFFFFFE0,
+  0xFFFFFFF0,
+  0xFFFFFFF8,
+  0xFFFFFFFC,
+  0xFFFFFFFE,
+  0xFFFFFFFF,
+};
+
+
+/**

+  Converts the low nibble of a byte  to hex unicode character.

+

+  @param  Nibble  lower nibble of a byte.

+

+  @return Hex unicode character.

+

+**/

+CHAR16

+NibbleToHexChar (

+  IN UINT8      Nibble

+  )

+{

+  //

+  // Porting Guide:

+  // This library interface is simply obsolete.

+  // Include the source code to user code.

+  //

+

+  Nibble &= 0x0F;

+  if (Nibble <= 0x9) {

+    return (CHAR16)(Nibble + L'0');

+  }

+

+  return (CHAR16)(Nibble - 0xA + L'A');

+}

+

+/**
+  Return the length of the mask. If the mask is invalid,
+  return the invalid length 33, which is IP4_MASK_NUM.
+  NetMask is in the host byte order.
+
+  @param  NetMask               The netmask to get the length from
+
+  @return The length of the netmask, IP4_MASK_NUM if the mask isn't
+  @return supported.
+
+**/
+INTN
+NetGetMaskLength (
+  IN IP4_ADDR               NetMask
+  )
+{
+  INTN                      Index;
+
+  for (Index = 0; Index < IP4_MASK_NUM; Index++) {
+    if (NetMask == mIp4AllMasks[Index]) {
+      break;
+    }
+  }
+
+  return Index;
+}
+
+
+
+/**
+  Return the class of the address, such as class a, b, c.
+  Addr is in host byte order.
+
+  @param  Addr                  The address to get the class from
+
+  @return IP address class, such as IP4_ADDR_CLASSA
+
+**/
+INTN
+NetGetIpClass (
+  IN IP4_ADDR               Addr
+  )
+{
+  UINT8                     ByteOne;
+
+  ByteOne = (UINT8) (Addr >> 24);
+
+  if ((ByteOne & 0x80) == 0) {
+    return IP4_ADDR_CLASSA;
+
+  } else if ((ByteOne & 0xC0) == 0x80) {
+    return IP4_ADDR_CLASSB;
+
+  } else if ((ByteOne & 0xE0) == 0xC0) {
+    return IP4_ADDR_CLASSC;
+
+  } else if ((ByteOne & 0xF0) == 0xE0) {
+    return IP4_ADDR_CLASSD;
+
+  } else {
+    return IP4_ADDR_CLASSE;
+
+  }
+}
+
+
+/**
+  Check whether the IP is a valid unicast address according to
+  the netmask. If NetMask is zero, use the IP address's class to
+  get the default mask.
+
+  @param  Ip                    The IP to check againist
+  @param  NetMask               The mask of the IP
+
+  @return TRUE if IP is a valid unicast address on the network, otherwise FALSE
+
+**/
+BOOLEAN
+Ip4IsUnicast (
+  IN IP4_ADDR               Ip,
+  IN IP4_ADDR               NetMask
+  )
+{
+  INTN                      Class;
+
+  Class = NetGetIpClass (Ip);
+
+  if ((Ip == 0) || (Class >= IP4_ADDR_CLASSD)) {
+    return FALSE;
+  }
+
+  if (NetMask == 0) {
+    NetMask = mIp4AllMasks[Class << 3];
+  }
+
+  if (((Ip &~NetMask) == ~NetMask) || ((Ip &~NetMask) == 0)) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+
+/**
+  Initialize a random seed using current time.
+
+  None
+
+  @return The random seed initialized with current time.
+
+**/
+UINT32
+NetRandomInitSeed (
+  VOID
+  )
+{
+  EFI_TIME                  Time;
+  UINT32                    Seed;
+
+  gRT->GetTime (&Time, NULL);
+  Seed = (~Time.Hour << 24 | Time.Second << 16 | Time.Minute << 8 | Time.Day);
+  Seed ^= Time.Nanosecond;
+  Seed ^= Time.Year << 7;
+
+  return Seed;
+}
+
+
+/**
+  Extract a UINT32 from a byte stream, then convert it to host
+  byte order. Use this function to avoid alignment error.
+
+  @param  Buf                   The buffer to extract the UINT32.
+
+  @return The UINT32 extracted.
+
+**/
+UINT32
+NetGetUint32 (
+  IN UINT8                  *Buf
+  )
+{
+  UINT32                    Value;
+
+  NetCopyMem (&Value, Buf, sizeof (UINT32));
+  return NTOHL (Value);
+}
+
+
+/**
+  Put a UINT32 to the byte stream. Convert it from host byte order
+  to network byte order before putting.
+
+  @param  Buf                   The buffer to put the UINT32
+  @param  Data                  The data to put
+
+  @return None
+
+**/
+VOID
+NetPutUint32 (
+  IN UINT8                  *Buf,
+  IN UINT32                 Data
+  )
+{
+  Data = HTONL (Data);
+  NetCopyMem (Buf, &Data, sizeof (UINT32));
+}
+
+
+/**
+  Remove the first entry on the list
+
+  @param  Head                  The list header
+
+  @return The entry that is removed from the list, NULL if the list is empty.
+
+**/
+NET_LIST_ENTRY *
+NetListRemoveHead (
+  NET_LIST_ENTRY            *Head
+  )
+{
+  NET_LIST_ENTRY            *First;
+
+  ASSERT (Head != NULL);
+
+  if (NetListIsEmpty (Head)) {
+    return NULL;
+  }
+
+  First                         = Head->ForwardLink;
+  Head->ForwardLink             = First->ForwardLink;
+  First->ForwardLink->BackLink  = Head;
+
+  DEBUG_CODE (
+    First->ForwardLink  = (LIST_ENTRY     *) NULL;
+    First->BackLink     = (LIST_ENTRY     *) NULL;
+  );
+
+  return First;
+}
+
+
+/**
+  Remove the last entry on the list
+
+  @param  Head                  The list head
+
+  @return The entry that is removed from the list, NULL if the list is empty.
+
+**/
+NET_LIST_ENTRY *
+NetListRemoveTail (
+  NET_LIST_ENTRY            *Head
+  )
+{
+  NET_LIST_ENTRY            *Last;
+
+  ASSERT (Head != NULL);
+
+  if (NetListIsEmpty (Head)) {
+    return NULL;
+  }
+
+  Last                        = Head->BackLink;
+  Head->BackLink              = Last->BackLink;
+  Last->BackLink->ForwardLink = Head;
+
+  DEBUG_CODE (
+    Last->ForwardLink = (LIST_ENTRY     *) NULL;
+    Last->BackLink    = (LIST_ENTRY     *) NULL;
+  );
+
+  return Last;
+}
+
+
+/**
+  Insert the NewEntry after the PrevEntry
+
+  @param  PrevEntry             The previous entry to insert after
+  @param  NewEntry              The new entry to insert
+
+  @return None
+
+**/
+VOID
+NetListInsertAfter (
+  IN NET_LIST_ENTRY         *PrevEntry,
+  IN NET_LIST_ENTRY         *NewEntry
+  )
+{
+  NewEntry->BackLink                = PrevEntry;
+  NewEntry->ForwardLink             = PrevEntry->ForwardLink;
+  PrevEntry->ForwardLink->BackLink  = NewEntry;
+  PrevEntry->ForwardLink            = NewEntry;
+}
+
+
+/**
+  Insert the NewEntry before the PostEntry
+
+  @param  PostEntry             The entry to insert before
+  @param  NewEntry              The new entry to insert
+
+  @return None
+
+**/
+VOID
+NetListInsertBefore (
+  IN NET_LIST_ENTRY *PostEntry,
+  IN NET_LIST_ENTRY *NewEntry
+  )
+{
+  NewEntry->ForwardLink             = PostEntry;
+  NewEntry->BackLink                = PostEntry->BackLink;
+  PostEntry->BackLink->ForwardLink  = NewEntry;
+  PostEntry->BackLink               = NewEntry;
+}
+
+
+/**
+  Initialize the netmap. Netmap is a reposity to keep the <Key, Value> pairs.
+
+  @param  Map                   The netmap to initialize
+
+  @return None
+
+**/
+VOID
+NetMapInit (
+  IN NET_MAP                *Map
+  )
+{
+  ASSERT (Map != NULL);
+
+  NetListInit (&Map->Used);
+  NetListInit (&Map->Recycled);
+  Map->Count = 0;
+}
+
+
+/**
+  To clean up the netmap, that is, release allocated memories.
+
+  @param  Map                   The netmap to clean up.
+
+  @return None
+
+**/
+VOID
+NetMapClean (
+  IN NET_MAP                *Map
+  )
+{
+  NET_MAP_ITEM              *Item;
+  NET_LIST_ENTRY            *Entry;
+  NET_LIST_ENTRY            *Next;
+
+  ASSERT (Map != NULL);
+
+  NET_LIST_FOR_EACH_SAFE (Entry, Next, &Map->Used) {
+    Item = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);
+
+    NetListRemoveEntry (&Item->Link);
+    Map->Count--;
+
+    NetFreePool (Item);
+  }
+
+  ASSERT ((Map->Count == 0) && NetListIsEmpty (&Map->Used));
+
+  NET_LIST_FOR_EACH_SAFE (Entry, Next, &Map->Recycled) {
+    Item = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);
+
+    NetListRemoveEntry (&Item->Link);
+    NetFreePool (Item);
+  }
+
+  ASSERT (NetListIsEmpty (&Map->Recycled));
+}
+
+
+/**
+  Test whether the netmap is empty
+
+  @param  Map                   The net map to test
+
+  @return TRUE if the netmap is empty, otherwise FALSE.
+
+**/
+BOOLEAN
+NetMapIsEmpty (
+  IN NET_MAP                *Map
+  )
+{
+  ASSERT (Map != NULL);
+  return (BOOLEAN) (Map->Count == 0);
+}
+
+
+/**
+  Return the number of the <Key, Value> pairs in the netmap.
+
+  @param  Map                   The netmap to get the entry number
+
+  @return The entry number in the netmap.
+
+**/
+UINTN
+NetMapGetCount (
+  IN NET_MAP                *Map
+  )
+{
+  return Map->Count;
+}
+
+
+/**
+  Allocate an item for the netmap. It will try to allocate
+  a batch of items and return one.
+
+  @param  Map                   The netmap to allocate item for
+
+  @return The allocated item or NULL
+
+**/
+STATIC
+NET_MAP_ITEM *
+NetMapAllocItem (
+  IN NET_MAP                *Map
+  )
+{
+  NET_MAP_ITEM              *Item;
+  NET_LIST_ENTRY            *Head;
+  UINTN                     Index;
+
+  ASSERT (Map != NULL);
+
+  Head = &Map->Recycled;
+
+  if (NetListIsEmpty (Head)) {
+    for (Index = 0; Index < NET_MAP_INCREAMENT; Index++) {
+      Item = NetAllocatePool (sizeof (NET_MAP_ITEM));
+
+      if (Item == NULL) {
+        if (Index == 0) {
+          return NULL;
+        }
+
+        break;
+      }
+
+      NetListInsertHead (Head, &Item->Link);
+    }
+  }
+
+  Item = NET_LIST_HEAD (Head, NET_MAP_ITEM, Link);
+  NetListRemoveHead (Head);
+
+  return Item;
+}
+
+
+/**
+  Allocate an item to save the <Key, Value> pair to the head of the netmap.
+
+  @param  Map                   The netmap to insert into
+  @param  Key                   The user's key
+  @param  Value                 The user's value for the key
+
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate the memory for the item
+  @retval EFI_SUCCESS           The item is inserted to the head
+
+**/
+EFI_STATUS
+NetMapInsertHead (
+  IN NET_MAP                *Map,
+  IN VOID                   *Key,
+  IN VOID                   *Value    OPTIONAL
+  )
+{
+  NET_MAP_ITEM              *Item;
+
+  ASSERT (Map != NULL);
+
+  Item = NetMapAllocItem (Map);
+
+  if (Item == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Item->Key   = Key;
+  Item->Value = Value;
+  NetListInsertHead (&Map->Used, &Item->Link);
+
+  Map->Count++;
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Allocate an item to save the <Key, Value> pair to the tail of the netmap.
+
+  @param  Map                   The netmap to insert into
+  @param  Key                   The user's key
+  @param  Value                 The user's value for the key
+
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate the memory for the item
+  @retval EFI_SUCCESS           The item is inserted to the tail
+
+**/
+EFI_STATUS
+NetMapInsertTail (
+  IN NET_MAP                *Map,
+  IN VOID                   *Key,
+  IN VOID                   *Value    OPTIONAL
+  )
+{
+  NET_MAP_ITEM              *Item;
+
+  ASSERT (Map != NULL);
+
+  Item = NetMapAllocItem (Map);
+
+  if (Item == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Item->Key   = Key;
+  Item->Value = Value;
+  NetListInsertTail (&Map->Used, &Item->Link);
+
+  Map->Count++;
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Check whther the item is in the Map
+
+  @param  Map                   The netmap to search within
+  @param  Item                  The item to search
+
+  @return TRUE if the item is in the netmap, otherwise FALSE.
+
+**/
+STATIC
+BOOLEAN
+NetItemInMap (
+  IN NET_MAP                *Map,
+  IN NET_MAP_ITEM           *Item
+  )
+{
+  NET_LIST_ENTRY            *ListEntry;
+
+  NET_LIST_FOR_EACH (ListEntry, &Map->Used) {
+    if (ListEntry == &Item->Link) {
+      return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
+
+/**
+  Find the key in the netmap
+
+  @param  Map                   The netmap to search within
+  @param  Key                   The key to search
+
+  @return The point to the item contains the Key, or NULL if Key isn't in the map.
+
+**/
+NET_MAP_ITEM *
+NetMapFindKey (
+  IN  NET_MAP               *Map,
+  IN  VOID                  *Key
+  )
+{
+  NET_LIST_ENTRY          *Entry;
+  NET_MAP_ITEM            *Item;
+
+  ASSERT (Map != NULL);
+
+  NET_LIST_FOR_EACH (Entry, &Map->Used) {
+    Item = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);
+
+    if (Item->Key == Key) {
+      return Item;
+    }
+  }
+
+  return NULL;
+}
+
+
+/**
+  Remove the item from the netmap
+
+  @param  Map                   The netmap to remove the item from
+  @param  Item                  The item to remove
+  @param  Value                 The variable to receive the value if not NULL
+
+  @return The key of the removed item.
+
+**/
+VOID *
+NetMapRemoveItem (
+  IN  NET_MAP             *Map,
+  IN  NET_MAP_ITEM        *Item,
+  OUT VOID                **Value           OPTIONAL
+  )
+{
+  ASSERT ((Map != NULL) && (Item != NULL));
+  ASSERT (NetItemInMap (Map, Item));
+
+  NetListRemoveEntry (&Item->Link);
+  Map->Count--;
+  NetListInsertHead (&Map->Recycled, &Item->Link);
+
+  if (Value != NULL) {
+    *Value = Item->Value;
+  }
+
+  return Item->Key;
+}
+
+
+/**
+  Remove the first entry on the netmap
+
+  @param  Map                   The netmap to remove the head from
+  @param  Value                 The variable to receive the value if not NULL
+
+  @return The key of the item removed
+
+**/
+VOID *
+NetMapRemoveHead (
+  IN  NET_MAP               *Map,
+  OUT VOID                  **Value         OPTIONAL
+  )
+{
+  NET_MAP_ITEM  *Item;
+
+  //
+  // Often, it indicates a programming error to remove
+  // the first entry in an empty list
+  //
+  ASSERT (Map && !NetListIsEmpty (&Map->Used));
+
+  Item = NET_LIST_HEAD (&Map->Used, NET_MAP_ITEM, Link);
+  NetListRemoveEntry (&Item->Link);
+  Map->Count--;
+  NetListInsertHead (&Map->Recycled, &Item->Link);
+
+  if (Value != NULL) {
+    *Value = Item->Value;
+  }
+
+  return Item->Key;
+}
+
+
+/**
+  Remove the last entry on the netmap
+
+  @param  Map                   The netmap to remove the tail from
+  @param  Value                 The variable to receive the value if not NULL
+
+  @return The key of the item removed
+
+**/
+VOID *
+NetMapRemoveTail (
+  IN  NET_MAP               *Map,
+  OUT VOID                  **Value       OPTIONAL
+  )
+{
+  NET_MAP_ITEM              *Item;
+
+  //
+  // Often, it indicates a programming error to remove
+  // the last entry in an empty list
+  //
+  ASSERT (Map && !NetListIsEmpty (&Map->Used));
+
+  Item = NET_LIST_TAIL (&Map->Used, NET_MAP_ITEM, Link);
+  NetListRemoveEntry (&Item->Link);
+  Map->Count--;
+  NetListInsertHead (&Map->Recycled, &Item->Link);
+
+  if (Value != NULL) {
+    *Value = Item->Value;
+  }
+
+  return Item->Key;
+}
+
+
+/**
+  Iterate through the netmap and call CallBack for each item. It will
+  contiue the traverse if CallBack returns EFI_SUCCESS, otherwise, break
+  from the loop. It returns the CallBack's last return value. This
+  function is delete safe for the current item.
+
+  @param  Map                   The Map to iterate through
+  @param  CallBack              The callback function to call for each item.
+  @param  Arg                   The opaque parameter to the callback
+
+  @return It returns the CallBack's last return value.
+
+**/
+EFI_STATUS
+NetMapIterate (
+  IN NET_MAP                *Map,
+  IN NET_MAP_CALLBACK       CallBack,
+  IN VOID                   *Arg
+  )
+{
+
+  NET_LIST_ENTRY            *Entry;
+  NET_LIST_ENTRY            *Next;
+  NET_LIST_ENTRY            *Head;
+  NET_MAP_ITEM              *Item;
+  EFI_STATUS                Result;
+
+  ASSERT ((Map != NULL) && (CallBack != NULL));
+
+  Head = &Map->Used;
+
+  if (NetListIsEmpty (Head)) {
+    return EFI_SUCCESS;
+  }
+
+  NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {
+    Item   = NET_LIST_USER_STRUCT (Entry, NET_MAP_ITEM, Link);
+    Result = CallBack (Map, Item, Arg);
+
+    if (EFI_ERROR (Result)) {
+      return Result;
+    }
+  }
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  This is the default unload handle for all the network drivers.
+
+  @param  ImageHandle           The drivers' driver image.
+
+  @retval EFI_SUCCESS           The image is unloaded.
+  @retval Others                Failed to unload the image.
+
+**/
+EFI_STATUS
+EFIAPI
+NetLibDefaultUnload (
+  IN EFI_HANDLE             ImageHandle
+  )
+{
+  EFI_STATUS                        Status;
+  EFI_HANDLE                        *DeviceHandleBuffer;
+  UINTN                             DeviceHandleCount;
+  UINTN                             Index;
+  EFI_DRIVER_BINDING_PROTOCOL       *DriverBinding;
+#if (EFI_SPECIFICATION_VERSION >= 0x00020000)
+  EFI_COMPONENT_NAME2_PROTOCOL      *ComponentName;
+#else
+  EFI_COMPONENT_NAME_PROTOCOL       *ComponentName;
+#endif
+  EFI_DRIVER_CONFIGURATION_PROTOCOL *DriverConfiguration;
+  EFI_DRIVER_DIAGNOSTICS_PROTOCOL   *DriverDiagnostics;
+
+  //
+  // Get the list of all the handles in the handle database.
+  // If there is an error getting the list, then the unload
+  // operation fails.
+  //
+  Status = gBS->LocateHandleBuffer (
+                  AllHandles,
+                  NULL,
+                  NULL,
+                  &DeviceHandleCount,
+                  &DeviceHandleBuffer
+                  );
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Disconnect the driver specified by ImageHandle from all
+  // the devices in the handle database.
+  //
+  for (Index = 0; Index < DeviceHandleCount; Index++) {
+    Status = gBS->DisconnectController (
+                    DeviceHandleBuffer[Index],
+                    ImageHandle,
+                    NULL
+                    );
+  }
+
+  //
+  // Uninstall all the protocols installed in the driver entry point
+  //
+  for (Index = 0; Index < DeviceHandleCount; Index++) {
+    Status = gBS->HandleProtocol (
+                    DeviceHandleBuffer[Index],
+                    &gEfiDriverBindingProtocolGuid,
+                    &DriverBinding
+                    );
+
+    if (EFI_ERROR (Status)) {
+      continue;
+    }
+
+    if (DriverBinding->ImageHandle != ImageHandle) {
+      continue;
+    }
+
+    gBS->UninstallProtocolInterface (
+          ImageHandle,
+          &gEfiDriverBindingProtocolGuid,
+          DriverBinding
+          );
+#if (EFI_SPECIFICATION_VERSION >= 0x00020000)
+    Status = gBS->HandleProtocol (
+                    DeviceHandleBuffer[Index],
+                    &gEfiComponentName2ProtocolGuid,
+                    &ComponentName
+                    );
+    if (!EFI_ERROR (Status)) {
+      gBS->UninstallProtocolInterface (
+            ImageHandle,
+            &gEfiComponentName2ProtocolGuid,
+            ComponentName
+            );
+    }
+#else
+    Status = gBS->HandleProtocol (
+                    DeviceHandleBuffer[Index],
+                    &gEfiComponentNameProtocolGuid,
+                    &ComponentName
+                    );
+    if (!EFI_ERROR (Status)) {
+      gBS->UninstallProtocolInterface (
+             ImageHandle,
+             &gEfiComponentNameProtocolGuid,
+             ComponentName
+             );
+    }
+#endif
+
+    Status = gBS->HandleProtocol (
+                    DeviceHandleBuffer[Index],
+                    &gEfiDriverConfigurationProtocolGuid,
+                    &DriverConfiguration
+                    );
+
+    if (!EFI_ERROR (Status)) {
+      gBS->UninstallProtocolInterface (
+            ImageHandle,
+            &gEfiDriverConfigurationProtocolGuid,
+            DriverConfiguration
+            );
+    }
+
+    Status = gBS->HandleProtocol (
+                    DeviceHandleBuffer[Index],
+                    &gEfiDriverDiagnosticsProtocolGuid,
+                    &DriverDiagnostics
+                    );
+
+    if (!EFI_ERROR (Status)) {
+      gBS->UninstallProtocolInterface (
+            ImageHandle,
+            &gEfiDriverDiagnosticsProtocolGuid,
+            DriverDiagnostics
+            );
+    }
+  }
+
+  //
+  // Free the buffer containing the list of handles from the handle database
+  //
+  if (DeviceHandleBuffer != NULL) {
+    gBS->FreePool (DeviceHandleBuffer);
+  }
+
+  return EFI_SUCCESS;
+}
+
+
+
+/**
+  Create a child of the service that is identified by ServiceBindingGuid.
+
+  @param  Controller            The controller which has the service installed.
+  @param  Image                 The image handle used to open service.
+  @param  ServiceBindingGuid    The service's Guid.
+  @param  ChildHandle           The handle to receive the create child
+
+  @retval EFI_SUCCESS           The child is successfully created.
+  @retval Others                Failed to create the child.
+
+**/
+EFI_STATUS
+NetLibCreateServiceChild (
+  IN  EFI_HANDLE            Controller,
+  IN  EFI_HANDLE            Image,
+  IN  EFI_GUID              *ServiceBindingGuid,
+  OUT EFI_HANDLE            *ChildHandle
+  )
+{
+  EFI_STATUS                    Status;
+  EFI_SERVICE_BINDING_PROTOCOL  *Service;
+
+
+  ASSERT ((ServiceBindingGuid != NULL) && (ChildHandle != NULL));
+
+  //
+  // Get the ServiceBinding Protocol
+  //
+  Status = gBS->OpenProtocol (
+                  Controller,
+                  ServiceBindingGuid,
+                  (VOID **) &Service,
+                  Image,
+                  Controller,
+                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                  );
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Create a child
+  //
+  Status = Service->CreateChild (Service, ChildHandle);
+  return Status;
+}
+
+
+/**
+  Destory a child of the service that is identified by ServiceBindingGuid.
+
+  @param  Controller            The controller which has the service installed.
+  @param  Image                 The image handle used to open service.
+  @param  ServiceBindingGuid    The service's Guid.
+  @param  ChildHandle           The child to destory
+
+  @retval EFI_SUCCESS           The child is successfully destoried.
+  @retval Others                Failed to destory the child.
+
+**/
+EFI_STATUS
+NetLibDestroyServiceChild (
+  IN  EFI_HANDLE            Controller,
+  IN  EFI_HANDLE            Image,
+  IN  EFI_GUID              *ServiceBindingGuid,
+  IN  EFI_HANDLE            ChildHandle
+  )
+{
+  EFI_STATUS                    Status;
+  EFI_SERVICE_BINDING_PROTOCOL  *Service;
+
+  ASSERT (ServiceBindingGuid != NULL);
+
+  //
+  // Get the ServiceBinding Protocol
+  //
+  Status = gBS->OpenProtocol (
+                  Controller,
+                  ServiceBindingGuid,
+                  (VOID **) &Service,
+                  Image,
+                  Controller,
+                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                  );
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // destory the child
+  //
+  Status = Service->DestroyChild (Service, ChildHandle);
+  return Status;
+}
+
+
+/**
+  Convert the mac address of the simple network protocol installed on
+  SnpHandle to a unicode string. Callers are responsible for freeing the
+  string storage.
+
+  @param  SnpHandle             The handle where the simple network protocol is
+                                installed on.
+  @param  ImageHandle           The image handle used to act as the agent handle to
+                                get the simple network protocol.
+  @param  MacString             The pointer to store the address of the string
+                                representation of  the mac address.
+
+  @retval EFI_OUT_OF_RESOURCES  There are not enough memory resource.
+  @retval other                 Failed to open the simple network protocol.
+
+**/
+EFI_STATUS
+NetLibGetMacString (
+  IN           EFI_HANDLE  SnpHandle,
+  IN           EFI_HANDLE  ImageHandle,
+  IN OUT CONST CHAR16      **MacString
+  )
+{
+  EFI_STATUS                   Status;
+  EFI_SIMPLE_NETWORK_PROTOCOL  *Snp;
+  EFI_SIMPLE_NETWORK_MODE      *Mode;
+  CHAR16                       *MacAddress;
+  UINTN                        Index;
+
+  *MacString = NULL;
+
+  //
+  // Get the Simple Network protocol from the SnpHandle.
+  //
+  Status = gBS->OpenProtocol (
+                  SnpHandle,
+                  &gEfiSimpleNetworkProtocolGuid,
+                  (VOID **) &Snp,
+                  ImageHandle,
+                  SnpHandle,
+                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Mode = Snp->Mode;
+
+  //
+  // It takes 2 unicode characters to represent a 1 byte binary buffer.
+  // Plus one unicode character for the null-terminator.
+  //
+  MacAddress = NetAllocatePool ((2 * Mode->HwAddressSize + 1) * sizeof (CHAR16));
+  if (MacAddress == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  //
+  // Convert the mac address into a unicode string.
+  //
+  for (Index = 0; Index < Mode->HwAddressSize; Index++) {
+    MacAddress[Index * 2]     = NibbleToHexChar (Mode->CurrentAddress.Addr[Index] >> 4);
+    MacAddress[Index * 2 + 1] = NibbleToHexChar (Mode->CurrentAddress.Addr[Index]);
+  }
+
+  MacAddress[Mode->HwAddressSize * 2] = L'\0';
+
+  *MacString = MacAddress;
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Find the UNDI/SNP handle from controller and protocol GUID.
+  For example, IP will open a MNP child to transmit/receive
+  packets, when MNP is stopped, IP should also be stopped. IP
+  needs to find its own private data which is related the IP's
+  service binding instance that is install on UNDI/SNP handle.
+  Now, the controller is either a MNP or ARP child handle. But
+  IP opens these handle BY_DRIVER, use that info, we can get the
+  UNDI/SNP handle.
+
+  @param  Controller            Then protocol handle to check
+  @param  ProtocolGuid          The protocol that is related with the handle.
+
+  @return The UNDI/SNP handle or NULL.
+
+**/
+EFI_HANDLE
+NetLibGetNicHandle (
+  IN EFI_HANDLE             Controller,
+  IN EFI_GUID               *ProtocolGuid
+  )
+{
+  EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenBuffer;
+  EFI_HANDLE                          Handle;
+  EFI_STATUS                          Status;
+  UINTN                               OpenCount;
+  UINTN                               Index;
+
+  Status = gBS->OpenProtocolInformation (
+                  Controller,
+                  ProtocolGuid,
+                  &OpenBuffer,
+                  &OpenCount
+                  );
+
+  if (EFI_ERROR (Status)) {
+    return NULL;
+  }
+
+  Handle = NULL;
+
+  for (Index = 0; Index < OpenCount; Index++) {
+    if (OpenBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) {
+      Handle = OpenBuffer[Index].ControllerHandle;
+      break;
+    }
+  }
+
+  gBS->FreePool (OpenBuffer);
+  return Handle;
+}
+
+EFI_STATUS
+NetLibInstallAllDriverProtocols (
+  IN EFI_HANDLE                         ImageHandle,
+  IN EFI_SYSTEM_TABLE                   *SystemTable,
+  IN EFI_DRIVER_BINDING_PROTOCOL        *DriverBinding,
+  IN EFI_HANDLE                         DriverBindingHandle,
+  IN EFI_COMPONENT_NAME_PROTOCOL        *ComponentName,       OPTIONAL
+  IN EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration, OPTIONAL
+  IN EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics    OPTIONAL
+  )
+/*++
+
+Routine Description:
+
+  Intialize a driver by installing the Driver Binding Protocol onto the
+  driver's DriverBindingHandle.  This is typically the same as the driver's
+  ImageHandle, but it can be different if the driver produces multiple
+  DriverBinding Protocols.  This function also initializes the EFI Driver
+  Library that initializes the global variables gST, gBS, gRT.
+
+Arguments:
+
+  ImageHandle         - The image handle of the driver
+  SystemTable         - The EFI System Table that was passed to the driver's
+                        entry point
+  DriverBinding       - A Driver Binding Protocol instance that this driver
+                        is producing.
+  DriverBindingHandle - The handle that DriverBinding is to be installe onto.
+                        If this parameter is NULL, then a new handle is created.
+  ComponentName       - A Component Name Protocol instance that this driver is
+                        producing.
+  DriverConfiguration - A Driver Configuration Protocol instance that this
+                        driver is producing.
+  DriverDiagnostics   - A Driver Diagnostics Protocol instance that this
+                        driver is producing.
+
+Returns:
+
+  EFI_SUCCESS if all the protocols were installed onto DriverBindingHandle
+  Otherwise, then return status from gBS->InstallProtocolInterface()
+
+--*/
+{
+  return NetLibInstallAllDriverProtocolsWithUnload (
+           ImageHandle,
+           SystemTable,
+           DriverBinding,
+           DriverBindingHandle,
+           ComponentName,
+           DriverConfiguration,
+           DriverDiagnostics,
+           NetLibDefaultUnload
+           );
+}
+
+EFI_STATUS
+NetLibInstallAllDriverProtocolsWithUnload (
+  IN EFI_HANDLE                         ImageHandle,
+  IN EFI_SYSTEM_TABLE                   *SystemTable,
+  IN EFI_DRIVER_BINDING_PROTOCOL        *DriverBinding,
+  IN EFI_HANDLE                         DriverBindingHandle,
+  IN EFI_COMPONENT_NAME_PROTOCOL        *ComponentName,       OPTIONAL
+  IN EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration,   OPTIONAL
+  IN EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics,     OPTIONAL
+  IN NET_LIB_DRIVER_UNLOAD              Unload
+  )
+/*++
+
+Routine Description:
+
+  Intialize a driver by installing the Driver Binding Protocol onto the
+  driver's DriverBindingHandle.  This is typically the same as the driver's
+  ImageHandle, but it can be different if the driver produces multiple
+  DriverBinding Protocols.  This function also initializes the EFI Driver
+  Library that initializes the global variables gST, gBS, gRT.
+
+Arguments:
+
+  ImageHandle         - The image handle of the driver
+  SystemTable         - The EFI System Table that was passed to the driver's
+                        entry point
+  DriverBinding       - A Driver Binding Protocol instance that this driver
+                        is producing.
+  DriverBindingHandle - The handle that DriverBinding is to be installe onto.
+                        If this parameter is NULL, then a new handle is created.
+  ComponentName       - A Component Name Protocol instance that this driver is
+                        producing.
+  DriverConfiguration - A Driver Configuration Protocol instance that this
+                        driver is producing.
+  DriverDiagnostics   - A Driver Diagnostics Protocol instance that this
+                        driver is producing.
+  Unload    - The customized unload to install.
+
+Returns:
+
+  EFI_SUCCESS if all the protocols were installed onto DriverBindingHandle
+  Otherwise, then return status from gBS->InstallProtocolInterface()
+
+--*/
+{
+  EFI_STATUS                Status;
+  EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
+
+  Status = EfiLibInstallAllDriverProtocols (
+             ImageHandle,
+             SystemTable,
+             DriverBinding,
+             DriverBindingHandle,
+             ComponentName,
+             DriverConfiguration,
+             DriverDiagnostics
+             );
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Retrieve the Loaded Image Protocol from Image Handle
+  //
+  Status = gBS->OpenProtocol (
+                  ImageHandle,
+                  &gEfiLoadedImageProtocolGuid,
+                  (VOID **) &LoadedImage,
+                  ImageHandle,
+                  ImageHandle,
+                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                  );
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Fill in the Unload() service of the Loaded Image Protocol
+  //
+  LoadedImage->Unload = (Unload == NULL) ? NetLibDefaultUnload : Unload;
+  return EFI_SUCCESS;
+}
+
diff --git a/MdeModulePkg/Library/DxeNetLib/DxeNetLib.inf b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.inf
new file mode 100644
index 0000000000..be9ff1b379
--- /dev/null
+++ b/MdeModulePkg/Library/DxeNetLib/DxeNetLib.inf
@@ -0,0 +1,66 @@
+#/** @file

+# Component name for module NetLib

+#

+# FIX ME!

+# Copyright (c) 2006, Intel Corporation. All right reserved.

+#

+#  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.

+#

+#

+#**/

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = NetLibDxe

+  FILE_GUID                      = db6dcef3-9f4e-4340-9351-fc35aa8a5888

+  MODULE_TYPE                    = DXE_DRIVER

+  VERSION_STRING                 = 1.0

+  LIBRARY_CLASS                  = NetLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER

+  EDK_RELEASE_VERSION            = 0x00020000

+  EFI_SPECIFICATION_VERSION      = 0x00020000

+

+

+#

+# The following information is for reference only and not required by the build tools.

+#

+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC

+#

+

+[Sources.common]

+  DxeNetLib.c

+  NetBuffer.c

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+

+

+[LibraryClasses]

+  MemoryAllocationLib

+  UefiLib

+  BaseLib

+  UefiBootServicesTableLib

+  UefiRuntimeServicesTableLib

+  BaseMemoryLib

+  DebugLib

+  PrintLib

+

+

+[Protocols]

+  gEfiIp4ProtocolGuid                           # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverDiagnosticsProtocolGuid             # PROTOCOL ALWAYS_CONSUMED

+  gEfiUdp4ServiceBindingProtocolGuid            # PROTOCOL ALWAYS_CONSUMED

+  gEfiLoadedImageProtocolGuid                   # PROTOCOL ALWAYS_CONSUMED

+  gEfiIp4ServiceBindingProtocolGuid             # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverConfigurationProtocolGuid           # PROTOCOL ALWAYS_CONSUMED

+  gEfiSimpleNetworkProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverBindingProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+  gEfiUdp4ProtocolGuid                          # PROTOCOL ALWAYS_CONSUMED

+  gEfiComponentNameProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+

diff --git a/MdeModulePkg/Library/DxeNetLib/Netbuffer.c b/MdeModulePkg/Library/DxeNetLib/Netbuffer.c
new file mode 100644
index 0000000000..f32e31efbe
--- /dev/null
+++ b/MdeModulePkg/Library/DxeNetLib/Netbuffer.c
@@ -0,0 +1,1759 @@
+/** @file

+

+Copyright (c) 2005 - 2006, 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:

+

+  NetBuffer.c

+

+Abstract:

+

+

+

+**/

+

+#include <PiDxe.h>
+
+#include <Library/NetLib.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/MemoryAllocationLib.h>

+

+

+/**

+  Allocate and build up the sketch for a NET_BUF. The net buffer allocated

+  has the BlockOpNum's NET_BLOCK_OP, and its associated NET_VECTOR has the

+  BlockNum's NET_BLOCK.

+

+  @param  BlockNum              The number of NET_BLOCK in the Vector of net buffer

+  @param  BlockOpNum            The number of NET_BLOCK_OP in the net buffer

+

+  @retval *                     Pointer to the allocated NET_BUF. If NULL  the

+                                allocation failed due to resource limit.

+

+**/

+STATIC

+NET_BUF *

+NetbufAllocStruct (

+  IN UINT32                 BlockNum,

+  IN UINT32                 BlockOpNum

+  )

+{

+  NET_BUF                   *Nbuf;

+  NET_VECTOR                *Vector;

+

+  ASSERT (BlockOpNum >= 1);

+

+  //

+  // Allocate three memory blocks.

+  //

+  Nbuf = NetAllocateZeroPool (NET_BUF_SIZE (BlockOpNum));

+

+  if (Nbuf == NULL) {

+    return NULL;

+  }

+

+  Nbuf->Signature           = NET_BUF_SIGNATURE;

+  Nbuf->RefCnt              = 1;

+  Nbuf->BlockOpNum          = BlockOpNum;

+  NetListInit (&Nbuf->List);

+

+  if (BlockNum != 0) {

+    Vector = NetAllocateZeroPool (NET_VECTOR_SIZE (BlockNum));

+

+    if (Vector == NULL) {

+      goto FreeNbuf;

+    }

+

+    Vector->Signature = NET_VECTOR_SIGNATURE;

+    Vector->RefCnt    = 1;

+    Vector->BlockNum  = BlockNum;

+    Nbuf->Vector      = Vector;

+  }

+

+  return Nbuf;

+

+FreeNbuf:

+

+  NetFreePool (Nbuf);

+  return NULL;

+}

+

+

+/**

+  Allocate a single block NET_BUF. Upon allocation, all the

+  free space is in the tail room.

+

+  @param  Len                   The length of the block.

+

+  @retval *                     Pointer to the allocated NET_BUF. If NULL  the

+                                allocation failed due to resource limit.

+

+**/

+NET_BUF  *

+NetbufAlloc (

+  IN UINT32                 Len

+  )

+{

+  NET_BUF                   *Nbuf;

+  NET_VECTOR                *Vector;

+  UINT8                     *Bulk;

+

+  ASSERT (Len > 0);

+

+  Nbuf = NetbufAllocStruct (1, 1);

+

+  if (Nbuf == NULL) {

+    return NULL;

+  }

+

+  Bulk = NetAllocatePool (Len);

+

+  if (Bulk == NULL) {

+    goto FreeNBuf;

+  }

+

+  Vector = Nbuf->Vector;

+  Vector->Len                 = Len;

+

+  Vector->Block[0].Bulk       = Bulk;

+  Vector->Block[0].Len        = Len;

+

+  Nbuf->BlockOp[0].BlockHead  = Bulk;

+  Nbuf->BlockOp[0].BlockTail  = Bulk + Len;

+

+  Nbuf->BlockOp[0].Head       = Bulk;

+  Nbuf->BlockOp[0].Tail       = Bulk;

+  Nbuf->BlockOp[0].Size       = 0;

+

+  return Nbuf;

+

+FreeNBuf:

+  NetFreePool (Nbuf);

+  return NULL;

+}

+

+

+/**

+  Free the vector

+

+  @param  Vector                Pointer to the NET_VECTOR to be freed.

+

+  @return None.

+

+**/

+STATIC

+VOID

+NetbufFreeVector (

+  IN NET_VECTOR             *Vector

+  )

+{

+  UINT32                    Index;

+

+  NET_CHECK_SIGNATURE (Vector, NET_VECTOR_SIGNATURE);

+  ASSERT (Vector->RefCnt > 0);

+

+  Vector->RefCnt--;

+

+  if (Vector->RefCnt > 0) {

+    return;

+  }

+

+  if (Vector->Free != NULL) {

+    //

+    // Call external free function to free the vector if it

+    // isn't NULL. If NET_VECTOR_OWN_FIRST is set, release the

+    // first block since it is allocated by us

+    //

+    if (Vector->Flag & NET_VECTOR_OWN_FIRST) {

+      NetFreePool (Vector->Block[0].Bulk);

+    }

+

+    Vector->Free (Vector->Arg);

+

+  } else {

+    //

+    // Free each memory block associated with the Vector

+    //

+    for (Index = 0; Index < Vector->BlockNum; Index++) {

+      NetFreePool (Vector->Block[Index].Bulk);

+    }

+  }

+

+  NetFreePool (Vector);

+}

+

+

+/**

+  Free the buffer and its associated NET_VECTOR.

+

+  @param  Nbuf                  Pointer to the NET_BUF to be freed.

+

+  @return None.

+

+**/

+VOID

+NetbufFree (

+  IN NET_BUF                *Nbuf

+  )

+{

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+  ASSERT (Nbuf->RefCnt > 0);

+

+  Nbuf->RefCnt--;

+

+  if (Nbuf->RefCnt == 0) {

+    //

+    // Update Vector only when NBuf is to be released. That is,

+    // all the sharing of Nbuf increse Vector's RefCnt by one

+    //

+    NetbufFreeVector (Nbuf->Vector);

+    NetFreePool (Nbuf);

+  }

+}

+

+

+/**

+  Create a copy of NET_BUF that share the associated NET_DATA.

+

+  @param  Nbuf                  Pointer to the net buffer to be cloned.

+

+  @retval *                     Pointer to the cloned net buffer.

+

+**/

+NET_BUF  *

+NetbufClone (

+  IN NET_BUF                *Nbuf

+  )

+{

+  NET_BUF                   *Clone;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  Clone = NetAllocatePool (NET_BUF_SIZE (Nbuf->BlockOpNum));

+

+  if (Clone == NULL) {

+    return NULL;

+  }

+

+  Clone->Signature  = NET_BUF_SIGNATURE;

+  Clone->RefCnt     = 1;

+  NetListInit (&Clone->List);

+

+  Clone->Ip   = Nbuf->Ip;

+  Clone->Tcp  = Nbuf->Tcp;

+

+  NetCopyMem (Clone->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);

+

+  NET_GET_REF (Nbuf->Vector);

+

+  Clone->Vector     = Nbuf->Vector;

+  Clone->BlockOpNum = Nbuf->BlockOpNum;

+  Clone->TotalSize  = Nbuf->TotalSize;

+  NetCopyMem (Clone->BlockOp, Nbuf->BlockOp, sizeof (NET_BLOCK_OP) * Nbuf->BlockOpNum);

+

+  return Clone;

+}

+

+

+/**

+  Create a duplicated copy of Nbuf, data is copied. Also leave some

+  head space before the data.

+

+  @param  Nbuf                  Pointer to the net buffer to be cloned.

+  @param  Duplicate             Pointer to the net buffer to duplicate to, if NULL

+                                a new net  buffer is allocated.

+  @param  HeadSpace             Length of the head space to reserve

+

+  @retval *                     Pointer to the duplicated net buffer.

+

+**/

+NET_BUF  *

+NetbufDuplicate (

+  IN NET_BUF                *Nbuf,

+  IN NET_BUF                *Duplicate        OPTIONAL,

+  IN UINT32                 HeadSpace

+  )

+{

+  UINT8                     *Dst;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  if (Duplicate == NULL) {

+    Duplicate = NetbufAlloc (Nbuf->TotalSize + HeadSpace);

+  }

+

+  if (Duplicate == NULL) {

+    return NULL;

+  }

+

+  //

+  // Don't set the IP and TCP head point, since it is most

+  // like that they are pointing to the memory of Nbuf.

+  //

+  NetCopyMem (Duplicate->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);

+  NetbufReserve (Duplicate, HeadSpace);

+

+  Dst = NetbufAllocSpace (Duplicate, Nbuf->TotalSize, NET_BUF_TAIL);

+  NetbufCopy (Nbuf, 0, Nbuf->TotalSize, Dst);

+

+  return Duplicate;

+}

+

+

+/**

+  Free a list of net buffers.

+

+  @param  Head                  Pointer to the head of linked net buffers.

+

+  @return None.

+

+**/

+VOID

+NetbufFreeList (

+  IN NET_LIST_ENTRY         *Head

+  )

+{

+  NET_LIST_ENTRY            *Entry;

+  NET_LIST_ENTRY            *Next;

+  NET_BUF                   *Nbuf;

+

+  Entry = Head->ForwardLink;

+

+  NET_LIST_FOR_EACH_SAFE (Entry, Next, Head) {

+    Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);

+    NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+    NetListRemoveEntry (Entry);

+    NetbufFree (Nbuf);

+  }

+

+  ASSERT (NetListIsEmpty (Head));

+}

+

+

+/**

+  Get the position of some byte in the net buffer. This can be used

+  to, for example, retrieve the IP header in the packet. It also

+  returns the fragment that contains the byte which is used mainly by

+  the buffer implementation itself.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Offset                The index or offset of the byte

+  @param  Index                 Index of the fragment that contains the block

+

+  @retval *                     Pointer to the nth byte of data in the net buffer.

+                                If NULL, there is no such data in the net buffer.

+

+**/

+UINT8  *

+NetbufGetByte (

+  IN  NET_BUF               *Nbuf,

+  IN  UINT32                Offset,

+  OUT UINT32                *Index  OPTIONAL

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+  UINT32                    Loop;

+  UINT32                    Len;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  if (Offset >= Nbuf->TotalSize) {

+    return NULL;

+  }

+

+  BlockOp = Nbuf->BlockOp;

+  Len     = 0;

+

+  for (Loop = 0; Loop < Nbuf->BlockOpNum; Loop++) {

+

+    if (Len + BlockOp[Loop].Size <= Offset) {

+      Len += BlockOp[Loop].Size;

+      continue;

+    }

+

+    if (Index != NULL) {

+      *Index = Loop;

+    }

+

+    return BlockOp[Loop].Head + (Offset - Len);

+  }

+

+  return NULL;

+}

+

+

+

+/**

+  Set the NET_BLOCK and corresponding NET_BLOCK_OP in

+  the buffer. All the pointers in NET_BLOCK and NET_BLOCK_OP

+  are set to the bulk's head and tail respectively. So, this

+  function alone can't be used by NetbufAlloc.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Bulk                  Pointer to the data.

+  @param  Len                   Length of the bulk data.

+  @param  Index                 The data block index in the net buffer the bulk

+                                data should belong to.

+

+  @return None.

+

+**/

+STATIC

+VOID

+NetbufSetBlock (

+  IN NET_BUF                *Nbuf,

+  IN UINT8                  *Bulk,

+  IN UINT32                 Len,

+  IN UINT32                 Index

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+  NET_BLOCK                 *Block;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+  NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);

+  ASSERT (Index < Nbuf->BlockOpNum);

+

+  Block               = &(Nbuf->Vector->Block[Index]);

+  BlockOp             = &(Nbuf->BlockOp[Index]);

+  Block->Len          = Len;

+  Block->Bulk         = Bulk;

+  BlockOp->BlockHead  = Bulk;

+  BlockOp->BlockTail  = Bulk + Len;

+  BlockOp->Head       = Bulk;

+  BlockOp->Tail       = Bulk + Len;

+  BlockOp->Size       = Len;

+}

+

+

+

+/**

+  Set the NET_BLOCK_OP in the buffer. The corresponding NET_BLOCK

+  structure is left untouched. Some times, there is no 1:1 relationship

+  between NET_BLOCK and NET_BLOCK_OP. For example, that in NetbufGetFragment.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Bulk                  Pointer to the data.

+  @param  Len                   Length of the bulk data.

+  @param  Index                 The data block index in the net buffer the bulk

+                                data should belong to.

+

+  @return None.

+

+**/

+STATIC

+VOID

+NetbufSetBlockOp (

+  IN NET_BUF                *Nbuf,

+  IN UINT8                  *Bulk,

+  IN UINT32                 Len,

+  IN UINT32                 Index

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+  ASSERT (Index < Nbuf->BlockOpNum);

+

+  BlockOp             = &(Nbuf->BlockOp[Index]);

+  BlockOp->BlockHead  = Bulk;

+  BlockOp->BlockTail  = Bulk + Len;

+  BlockOp->Head       = Bulk;

+  BlockOp->Tail       = Bulk + Len;

+  BlockOp->Size       = Len;

+}

+

+

+/**

+  Helper function for NetbufClone. It is necessary because NetbufGetFragment

+  may allocate the first block to accomodate the HeadSpace and HeadLen. So, it

+  need to create a new NET_VECTOR. But, we want to avoid data copy by sharing

+  the old NET_VECTOR.

+

+  @param  Arg                   Point to the old NET_VECTOR

+

+  @return NONE

+

+**/

+STATIC

+VOID

+NetbufGetFragmentFree (

+  IN VOID                   *Arg

+  )

+{

+  NET_VECTOR                *Vector;

+

+  Vector = (NET_VECTOR *)Arg;

+  NetbufFreeVector (Vector);

+}

+

+

+

+/**

+  Create a NET_BUF structure which contains Len byte data of

+  Nbuf starting from Offset. A new NET_BUF structure will be

+  created but the associated data in NET_VECTOR is shared.

+  This function exists to do IP packet fragmentation.

+

+  @param  Nbuf                  Pointer to the net buffer to be cloned.

+  @param  Offset                Starting point of the data to be included in new

+                                buffer.

+  @param  Len                   How many data to include in new data

+  @param  HeadSpace             How many bytes of head space to reserve for

+                                protocol header

+

+  @retval *                     Pointer to the cloned net buffer.

+

+**/

+NET_BUF  *

+NetbufGetFragment (

+  IN NET_BUF                *Nbuf,

+  IN UINT32                 Offset,

+  IN UINT32                 Len,

+  IN UINT32                 HeadSpace

+  )

+{

+  NET_BUF                   *Child;

+  NET_VECTOR                *Vector;

+  NET_BLOCK_OP              *BlockOp;

+  UINT32                    CurBlockOp;

+  UINT32                    BlockOpNum;

+  UINT8                     *FirstBulk;

+  UINT32                    Index;

+  UINT32                    First;

+  UINT32                    Last;

+  UINT32                    FirstSkip;

+  UINT32                    FirstLen;

+  UINT32                    LastLen;

+  UINT32                    Cur;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  if ((Len == 0) || (Offset + Len > Nbuf->TotalSize)) {

+    return NULL;

+  }

+

+  //

+  // First find the first and last BlockOp that contains

+  // the valid data, and compute the offset of the first

+  // BlockOp and length of the last BlockOp

+  //

+  BlockOp = Nbuf->BlockOp;

+  Cur     = 0;

+

+  for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {

+    if (Offset < Cur + BlockOp[Index].Size) {

+      break;

+    }

+

+    Cur += BlockOp[Index].Size;

+  }

+

+  //

+  // First is the index of the first BlockOp, FirstSkip is

+  // the offset of the first byte in the first BlockOp.

+  //

+  First     = Index;

+  FirstSkip = Offset - Cur;

+  FirstLen  = BlockOp[Index].Size - FirstSkip;

+

+  //

+  //redundant assignment to make compiler happy.

+  //

+  Last      = 0;

+  LastLen   = 0;

+

+  if (Len > FirstLen) {

+    Cur += BlockOp[Index].Size;

+    Index++;

+

+    for (; Index < Nbuf->BlockOpNum; Index++) {

+      if (Offset + Len <= Cur + BlockOp[Index].Size) {

+        Last    = Index;

+        LastLen = Offset + Len - Cur;

+        break;

+      }

+

+      Cur += BlockOp[Index].Size;

+    }

+

+  } else {

+    Last     = First;

+    LastLen  = Len;

+    FirstLen = Len;

+  }

+

+  BlockOpNum = Last - First + 1;

+  CurBlockOp = 0;

+

+  if (HeadSpace != 0) {

+    //

+    // Allocate an extra block to accomdate the head space.

+    //

+    BlockOpNum++;

+

+    Child = NetbufAllocStruct (1, BlockOpNum);

+

+    if (Child == NULL) {

+      return NULL;

+    }

+

+    FirstBulk = NetAllocatePool (HeadSpace);

+

+    if (FirstBulk == NULL) {

+      goto FreeChild;

+    }

+

+    Vector        = Child->Vector;

+    Vector->Free  = NetbufGetFragmentFree;

+    Vector->Arg   = Nbuf->Vector;

+    Vector->Flag  = NET_VECTOR_OWN_FIRST;

+    Vector->Len   = HeadSpace;

+

+    //

+    //Reserve the head space in the first block

+    //

+    NetbufSetBlock (Child, FirstBulk, HeadSpace, 0);

+    Child->BlockOp[0].Head += HeadSpace;

+    Child->BlockOp[0].Size =  0;

+    CurBlockOp++;

+

+  }else {

+    Child = NetbufAllocStruct (0, BlockOpNum);

+

+    if (Child == NULL) {

+      return NULL;

+    }

+

+    Child->Vector = Nbuf->Vector;

+  }

+

+  NET_GET_REF (Nbuf->Vector);

+  Child->TotalSize = Len;

+

+  //

+  // Set all the BlockOp up, the first and last one are special

+  // and need special process.

+  //

+  NetbufSetBlockOp (

+    Child,

+    Nbuf->BlockOp[First].Head + FirstSkip,

+    FirstLen,

+    CurBlockOp++

+    );

+

+  for (Index = First + 1; Index <= Last - 1 ; Index++) {

+    NetbufSetBlockOp (

+      Child,

+      BlockOp[Index].Head,

+      BlockOp[Index].Size,

+      CurBlockOp++

+      );

+  }

+

+  if (First != Last) {

+    NetbufSetBlockOp (

+      Child,

+      BlockOp[Last].Head,

+      LastLen,

+      CurBlockOp

+      );

+  }

+

+  NetCopyMem (Child->ProtoData, Nbuf->ProtoData, NET_PROTO_DATA);

+  return Child;

+

+FreeChild:

+

+  NetFreePool (Child);

+  return NULL;

+}

+

+

+

+/**

+  Build a NET_BUF from external blocks.

+

+  @param  ExtFragment           Pointer to the data block.

+  @param  ExtNum                The number of the data block.

+  @param  HeadSpace             The head space to be reserved.

+  @param  HeadLen               The length of the protocol header, This function

+                                will pull that number of data into a linear block.

+  @param  ExtFree               Pointer to the caller provided free function.

+  @param  Arg                   The argument passed to ExtFree when ExtFree is

+                                called.

+

+  @retval *                     Pointer to the net buffer built from the data

+                                blocks.

+

+**/

+NET_BUF  *

+NetbufFromExt (

+  IN NET_FRAGMENT           *ExtFragment,

+  IN UINT32                 ExtNum,

+  IN UINT32                 HeadSpace,

+  IN UINT32                 HeadLen,

+  IN NET_VECTOR_EXT_FREE    ExtFree,

+  IN VOID                   *Arg          OPTIONAL

+  )

+{

+  NET_BUF                   *Nbuf;

+  NET_VECTOR                *Vector;

+  NET_FRAGMENT              SavedFragment;

+  UINT32                    SavedIndex;

+  UINT32                    TotalLen;

+  UINT32                    BlockNum;

+  UINT8                     *FirstBlock;

+  UINT32                    FirstBlockLen;

+  UINT8                     *Header;

+  UINT32                    CurBlock;

+  UINT32                    Index;

+  UINT32                    Len;

+  UINT32                    Copied;

+

+  ASSERT ((ExtFragment != NULL) && (ExtNum > 0) && (ExtFree != NULL));

+

+  SavedFragment.Bulk = NULL;

+  SavedFragment.Len  = 0;

+

+  FirstBlockLen  = 0;

+  FirstBlock     = NULL;

+  BlockNum       = ExtNum;

+  Index          = 0;

+  TotalLen       = 0;

+  SavedIndex     = 0;

+  Len            = 0;

+  Copied         = 0;

+

+  //

+  // No need to consolidate the header if the first block is

+  // longer than the header length or there is only one block.

+  //

+  if ((ExtFragment[0].Len >= HeadLen) || (ExtNum == 1)) {

+    HeadLen = 0;

+  }

+

+  //

+  // Allocate an extra block if we need to:

+  //  1. Allocate some header space

+  //  2. aggreate the packet header

+  //

+  if ((HeadSpace != 0) || (HeadLen != 0)) {

+    FirstBlockLen = HeadLen + HeadSpace;

+    FirstBlock    = NetAllocatePool (FirstBlockLen);

+

+    if (FirstBlock == NULL) {

+      return NULL;

+    }

+

+    BlockNum++;

+  }

+

+  //

+  // Copy the header to the first block, reduce the NET_BLOCK

+  // to allocate by one for each block that is completely covered

+  // by the first bulk.

+  //

+  if (HeadLen != 0) {

+    Len    = HeadLen;

+    Header = FirstBlock + HeadSpace;

+

+    for (Index = 0; Index < ExtNum; Index++) {

+      if (Len >= ExtFragment[Index].Len) {

+        NetCopyMem (Header, ExtFragment[Index].Bulk, ExtFragment[Index].Len);

+

+        Copied    += ExtFragment[Index].Len;

+        Len       -= ExtFragment[Index].Len;

+        Header    += ExtFragment[Index].Len;

+        TotalLen  += ExtFragment[Index].Len;

+        BlockNum--;

+

+        if (Len == 0) {

+          //

+          // Increament the index number to point to the next

+          // non-empty fragment.

+          //

+          Index++;

+          break;

+        }

+

+      } else {

+        NetCopyMem (Header, ExtFragment[Index].Bulk, Len);

+

+        Copied    += Len;

+        TotalLen  += Len;

+

+        //

+        // Adjust the block structure to exclude the data copied,

+        // So, the left-over block can be processed as other blocks.

+        // But it must be recovered later. (SavedIndex > 0) always

+        // holds since we don't aggreate the header if the first block

+        // is bigger enough that the header is continuous

+        //

+        SavedIndex    = Index;

+        SavedFragment = ExtFragment[Index];

+        ExtFragment[Index].Bulk += Len;

+        ExtFragment[Index].Len  -= Len;

+        break;

+      }

+    }

+  }

+

+  Nbuf = NetbufAllocStruct (BlockNum, BlockNum);

+

+  if (Nbuf == NULL) {

+    goto FreeFirstBlock;

+  }

+

+  Vector       = Nbuf->Vector;

+  Vector->Free = ExtFree;

+  Vector->Arg  = Arg;

+  Vector->Flag = (FirstBlockLen ? NET_VECTOR_OWN_FIRST : 0);

+

+  //

+  // Set the first block up which may contain

+  // some head space and aggregated header

+  //

+  CurBlock = 0;

+

+  if (FirstBlockLen != 0) {

+    NetbufSetBlock (Nbuf, FirstBlock, HeadSpace + Copied, 0);

+    Nbuf->BlockOp[0].Head += HeadSpace;

+    Nbuf->BlockOp[0].Size =  Copied;

+

+    CurBlock++;

+  }

+

+  for (; Index < ExtNum; Index++) {

+    NetbufSetBlock (Nbuf, ExtFragment[Index].Bulk, ExtFragment[Index].Len, CurBlock);

+    TotalLen += ExtFragment[Index].Len;

+    CurBlock++;

+  }

+

+  Vector->Len     = TotalLen + HeadSpace;

+  Nbuf->TotalSize = TotalLen;

+

+  if (SavedIndex) {

+    ExtFragment[SavedIndex] = SavedFragment;

+  }

+

+  return Nbuf;

+

+FreeFirstBlock:

+  NetFreePool (FirstBlock);

+  return NULL;

+}

+

+

+/**

+  Build a fragment table to contain the fragments in the

+  buffer. This is the opposite of the NetbufFromExt.

+

+  @param  Nbuf                  Point to the net buffer

+  @param  ExtFragment           Pointer to the data block.

+  @param  ExtNum                The number of the data block.

+

+  @retval EFI_BUFFER_TOO_SMALL  The number of non-empty block is bigger than ExtNum

+  @retval EFI_SUCCESS           Fragment table built.

+

+**/

+EFI_STATUS

+NetbufBuildExt (

+  IN NET_BUF                *Nbuf,

+  IN NET_FRAGMENT           *ExtFragment,

+  IN UINT32                 *ExtNum

+  )

+{

+  UINT32                    Index;

+  UINT32                    Current;

+

+  Current = 0;

+

+  for (Index = 0; (Index < Nbuf->BlockOpNum); Index++) {

+    if (Nbuf->BlockOp[Index].Size == 0) {

+      continue;

+    }

+

+    if (Current < *ExtNum) {

+      ExtFragment[Current].Bulk = Nbuf->BlockOp[Index].Head;

+      ExtFragment[Current].Len  = Nbuf->BlockOp[Index].Size;

+      Current++;

+    } else {

+      return EFI_BUFFER_TOO_SMALL;

+    }

+  }

+

+  *ExtNum = Current;

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Build a NET_BUF from a list of NET_BUF.

+

+  @param  BufList               A List of NET_BUF.

+  @param  HeadSpace             The head space to be reserved.

+  @param  HeaderLen             The length of the protocol header, This function

+                                will pull that number of data into a linear block.

+  @param  ExtFree               Pointer to the caller provided free function.

+  @param  Arg                   The argument passed to ExtFree when ExtFree is

+                                called.

+

+  @retval *                     Pointer to the net buffer built from the data

+                                blocks.

+

+**/

+NET_BUF  *

+NetbufFromBufList (

+  IN NET_LIST_ENTRY         *BufList,

+  IN UINT32                 HeadSpace,

+  IN UINT32                 HeaderLen,

+  IN NET_VECTOR_EXT_FREE    ExtFree,

+  IN VOID                   *Arg              OPTIONAL

+  )

+{

+  NET_FRAGMENT              *Fragment;

+  UINT32                    FragmentNum;

+  NET_LIST_ENTRY            *Entry;

+  NET_BUF                   *Nbuf;

+  UINT32                    Index;

+  UINT32                    Current;

+

+  //

+  //Compute how many blocks are there

+  //

+  FragmentNum = 0;

+

+  NET_LIST_FOR_EACH (Entry, BufList) {

+    Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);

+    NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+    FragmentNum += Nbuf->BlockOpNum;

+  }

+

+  //

+  //Allocate and copy block points

+  //

+  Fragment = NetAllocatePool (sizeof (NET_FRAGMENT) * FragmentNum);

+

+  if (Fragment == NULL) {

+    return NULL;

+  }

+

+  Current = 0;

+

+  NET_LIST_FOR_EACH (Entry, BufList) {

+    Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);

+    NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+    for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {

+      if (Nbuf->BlockOp[Index].Size) {

+        Fragment[Current].Bulk = Nbuf->BlockOp[Index].Head;

+        Fragment[Current].Len  = Nbuf->BlockOp[Index].Size;

+        Current++;

+      }

+    }

+  }

+

+  Nbuf = NetbufFromExt (Fragment, Current, HeadSpace, HeaderLen, ExtFree, Arg);

+  NetFreePool (Fragment);

+

+  return Nbuf;

+}

+

+

+/**

+  Reserve some space in the header room of the buffer.

+  Upon allocation, all the space are in the tail room

+  of the buffer. Call this function to move some space

+  to the header room. This function is quite limited in

+  that it can only reserver space from the first block

+  of an empty NET_BUF not built from the external. But

+  it should be enough for the network stack.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Len                   The length of buffer to be reserverd.

+

+  @return None.

+

+**/

+VOID

+NetbufReserve (

+  IN NET_BUF                *Nbuf,

+  IN UINT32                 Len

+  )

+{

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+  NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);

+

+  ASSERT ((Nbuf->BlockOpNum == 1) && (Nbuf->TotalSize == 0));

+  ASSERT ((Nbuf->Vector->Free == NULL) && (Nbuf->Vector->Len >= Len));

+

+  Nbuf->BlockOp[0].Head += Len;

+  Nbuf->BlockOp[0].Tail += Len;

+

+  ASSERT (Nbuf->BlockOp[0].Tail <= Nbuf->BlockOp[0].BlockTail);

+}

+

+

+/**

+  Allocate some space from the header or tail of the buffer.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Len                   The length of the buffer to be allocated.

+  @param  FromHead              The flag to indicate whether reserve the data from

+                                head or tail. TRUE for from head, and FALSE for

+                                from tail.

+

+  @retval *                     Pointer to the first byte of the allocated buffer.

+

+**/

+UINT8  *

+NetbufAllocSpace (

+  IN NET_BUF                *Nbuf,

+  IN UINT32                 Len,

+  IN BOOLEAN                FromHead

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+  UINT32                    Index;

+  UINT8                     *SavedTail;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+  NET_CHECK_SIGNATURE (Nbuf->Vector, NET_VECTOR_SIGNATURE);

+

+  ASSERT (Len > 0);

+

+  if (FromHead) {

+    //

+    // Allocate some space from head. If the buffer is empty,

+    // allocate from the first block. If it isn't, allocate

+    // from the first non-empty block, or the block before that.

+    //

+    if (Nbuf->TotalSize == 0) {

+      Index = 0;

+    } else {

+      NetbufGetByte (Nbuf, 0, &Index);

+

+      if ((NET_HEADSPACE(&(Nbuf->BlockOp[Index])) < Len) && (Index > 0)) {

+        Index--;

+      }

+    }

+

+    BlockOp = &(Nbuf->BlockOp[Index]);

+

+    if (NET_HEADSPACE (BlockOp) < Len) {

+      return NULL;

+    }

+

+    BlockOp->Head   -= Len;

+    BlockOp->Size   += Len;

+    Nbuf->TotalSize += Len;

+

+    return BlockOp->Head;

+

+  } else {

+    //

+    // Allocate some space from the tail. If the buffer is empty,

+    // allocate from the first block. If it isn't, allocate

+    // from the last non-empty block, or the block after that.

+    //

+    if (Nbuf->TotalSize == 0) {

+      Index = 0;

+    } else {

+      NetbufGetByte (Nbuf, Nbuf->TotalSize - 1, &Index);

+

+      if ((NET_TAILSPACE(&(Nbuf->BlockOp[Index])) < Len) &&

+          (Index < Nbuf->BlockOpNum - 1)) {

+

+        Index++;

+      }

+    }

+

+    BlockOp = &(Nbuf->BlockOp[Index]);

+

+    if (NET_TAILSPACE (BlockOp) < Len) {

+      return NULL;

+    }

+

+    SavedTail       = BlockOp->Tail;

+

+    BlockOp->Tail   += Len;

+    BlockOp->Size   += Len;

+    Nbuf->TotalSize += Len;

+

+    return SavedTail;

+  }

+}

+

+

+/**

+  Trim a single NET_BLOCK.

+

+  @param  BlockOp               Pointer to the NET_BLOCK.

+  @param  Len                   The length of the data to be trimmed.

+  @param  FromHead              The flag to indicate whether trim data from head or

+                                tail. TRUE for from head, and FALSE for from tail.

+

+  @return None.

+

+**/

+STATIC

+VOID

+NetblockTrim (

+  IN NET_BLOCK_OP           *BlockOp,

+  IN UINT32                 Len,

+  IN BOOLEAN                FromHead

+  )

+{

+  ASSERT (BlockOp && (BlockOp->Size >= Len));

+

+  BlockOp->Size -= Len;

+

+  if (FromHead) {

+    BlockOp->Head += Len;

+  } else {

+    BlockOp->Tail -= Len;

+  }

+}

+

+

+/**

+  Trim some data from the header or tail of the buffer.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Len                   The length of the data to be trimmed.

+  @param  FromHead              The flag to indicate whether trim data from head or

+                                tail. TRUE for from head, and FALSE for from tail.

+

+  @retval UINTN                 Length of the actually trimmed data.

+

+**/

+UINT32

+NetbufTrim (

+  IN NET_BUF                *Nbuf,

+  IN UINT32                 Len,

+  IN BOOLEAN                FromHead

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+  UINT32                    Index;

+  UINT32                    Trimmed;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  if (Len > Nbuf->TotalSize) {

+    Len = Nbuf->TotalSize;

+  }

+

+  //

+  // If FromTail is true, iterate backward. That

+  // is, init Index to NBuf->BlockNum - 1, and

+  // decrease it by 1 during each loop. Otherwise,

+  // iterate forward. That is, init Index to 0, and

+  // increase it by 1 during each loop.

+  //

+  Trimmed          = 0;

+  Nbuf->TotalSize -= Len;

+

+  Index   = (FromHead ? 0 : Nbuf->BlockOpNum - 1);

+  BlockOp = Nbuf->BlockOp;

+

+  for (;;) {

+    if (BlockOp[Index].Size == 0) {

+      Index += (FromHead ? 1 : -1);

+      continue;

+    }

+

+    if (Len > BlockOp[Index].Size) {

+      Len     -= BlockOp[Index].Size;

+      Trimmed += BlockOp[Index].Size;

+      NetblockTrim (&BlockOp[Index], BlockOp[Index].Size, FromHead);

+    } else {

+      Trimmed += Len;

+      NetblockTrim (&BlockOp[Index], Len, FromHead);

+      break;

+    }

+

+    Index += (FromHead ? 1 : -1);

+  }

+

+  return Trimmed;

+}

+

+

+/**

+  Copy the data from the specific offset to the destination.

+

+  @param  Nbuf                  Pointer to the net buffer.

+  @param  Offset                The sequence number of the first byte to copy.

+  @param  Len                   Length of the data to copy.

+  @param  Dest                  The destination of the data to copy to.

+

+  @retval UINTN                 The length of the copied data.

+

+**/

+UINT32

+NetbufCopy (

+  IN NET_BUF                *Nbuf,

+  IN UINT32                 Offset,

+  IN UINT32                 Len,

+  IN UINT8                  *Dest

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+  UINT32                    Skip;

+  UINT32                    Left;

+  UINT32                    Copied;

+  UINT32                    Index;

+  UINT32                    Cur;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+  ASSERT (Dest);

+

+  if ((Len == 0) || (Nbuf->TotalSize <= Offset)) {

+    return 0;

+  }

+

+  if (Nbuf->TotalSize - Offset < Len) {

+    Len = Nbuf->TotalSize - Offset;

+  }

+

+  BlockOp = Nbuf->BlockOp;

+

+  //

+  // Skip to the offset. Don't make "Offset-By-One" error here.

+  // Cur + BLOCK.SIZE is the first sequence number of next block.

+  // So, (Offset < Cur + BLOCK.SIZE) means that the  first byte

+  // is in the current block. if (Offset == Cur + BLOCK.SIZE), the

+  // first byte is the next block's first byte.

+  //

+  Cur = 0;

+

+  for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {

+    if (BlockOp[Index].Size == 0) {

+      continue;

+    }

+

+    if (Offset < Cur + BlockOp[Index].Size) {

+      break;

+    }

+

+    Cur += BlockOp[Index].Size;

+  }

+

+  //

+  // Cur is the sequence number of the first byte in the block

+  // Offset - Cur is the number of bytes before first byte to

+  // to copy in the current block.

+  //

+  Skip  = Offset - Cur;

+  Left  = BlockOp[Index].Size - Skip;

+

+  if (Len <= Left) {

+    NetCopyMem (Dest, BlockOp[Index].Head + Skip, Len);

+    return Len;

+  }

+

+  NetCopyMem (Dest, BlockOp[Index].Head + Skip, Left);

+

+  Dest  += Left;

+  Len   -= Left;

+  Copied = Left;

+

+  Index++;

+

+  for (; Index < Nbuf->BlockOpNum; Index++) {

+    if (Len > BlockOp[Index].Size) {

+      Len    -= BlockOp[Index].Size;

+      Copied += BlockOp[Index].Size;

+

+      NetCopyMem (Dest, BlockOp[Index].Head, BlockOp[Index].Size);

+      Dest   += BlockOp[Index].Size;

+    } else {

+      Copied += Len;

+      NetCopyMem (Dest, BlockOp[Index].Head, Len);

+      break;

+    }

+  }

+

+  return Copied;

+}

+

+

+/**

+  Initiate the net buffer queue.

+

+  @param  NbufQue               Pointer to the net buffer queue to be initiated.

+

+  @return None.

+

+**/

+VOID

+NetbufQueInit (

+  IN NET_BUF_QUEUE          *NbufQue

+  )

+{

+  NbufQue->Signature  = NET_QUE_SIGNATURE;

+  NbufQue->RefCnt     = 1;

+  NetListInit (&NbufQue->List);

+

+  NetListInit (&NbufQue->BufList);

+  NbufQue->BufSize  = 0;

+  NbufQue->BufNum   = 0;

+}

+

+

+/**

+  Allocate an initialized net buffer queue.

+

+  None.

+

+  @retval *                     Pointer to the allocated net buffer queue.

+

+**/

+NET_BUF_QUEUE  *

+NetbufQueAlloc (

+  VOID

+  )

+{

+  NET_BUF_QUEUE             *NbufQue;

+

+  NbufQue = NetAllocatePool (sizeof (NET_BUF_QUEUE));

+  if (NbufQue == NULL) {

+    return NULL;

+  }

+

+  NetbufQueInit (NbufQue);

+

+  return NbufQue;

+}

+

+

+/**

+  Free a net buffer queue.

+

+  @param  NbufQue               Poitner to the net buffer queue to be freed.

+

+  @return None.

+

+**/

+VOID

+NetbufQueFree (

+  IN NET_BUF_QUEUE          *NbufQue

+  )

+{

+  NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);

+

+  NbufQue->RefCnt--;

+

+  if (NbufQue->RefCnt == 0) {

+    NetbufQueFlush (NbufQue);

+    NetFreePool (NbufQue);

+  }

+}

+

+

+/**

+  Append a buffer to the end of the queue.

+

+  @param  NbufQue               Pointer to the net buffer queue.

+  @param  Nbuf                  Pointer to the net buffer to be appended.

+

+  @return None.

+

+**/

+VOID

+NetbufQueAppend (

+  IN NET_BUF_QUEUE          *NbufQue,

+  IN NET_BUF                *Nbuf

+  )

+{

+  NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  NetListInsertTail (&NbufQue->BufList, &Nbuf->List);

+

+  NbufQue->BufSize += Nbuf->TotalSize;

+  NbufQue->BufNum++;

+}

+

+

+/**

+  Remove a net buffer from head in the specific queue.

+

+  @param  NbufQue               Pointer to the net buffer queue.

+

+  @retval *                     Pointer to the net buffer removed from the specific

+                                queue.

+

+**/

+NET_BUF  *

+NetbufQueRemove (

+  IN NET_BUF_QUEUE          *NbufQue

+  )

+{

+  NET_BUF                   *First;

+

+  NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);

+

+  if (NbufQue->BufNum == 0) {

+    return NULL;

+  }

+

+  First = NET_LIST_USER_STRUCT (NbufQue->BufList.ForwardLink, NET_BUF, List);

+

+  NetListRemoveHead (&NbufQue->BufList);

+

+  NbufQue->BufSize -= First->TotalSize;

+  NbufQue->BufNum--;

+  return First;

+}

+

+

+/**

+  Copy some data from the buffer queue to the destination.

+

+  @param  NbufQue               Pointer to the net buffer queue.

+  @param  Offset                The sequence number of the first byte to copy.

+  @param  Len                   Length of the data to copy.

+  @param  Dest                  The destination of the data to copy to.

+

+  @retval UINTN                 The length of the copied data.

+

+**/

+UINT32

+NetbufQueCopy (

+  IN NET_BUF_QUEUE          *NbufQue,

+  IN UINT32                 Offset,

+  IN UINT32                 Len,

+  IN UINT8                  *Dest

+  )

+{

+  NET_LIST_ENTRY            *Entry;

+  NET_BUF                   *Nbuf;

+  UINT32                    Skip;

+  UINT32                    Left;

+  UINT32                    Cur;

+  UINT32                    Copied;

+

+  NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);

+  ASSERT (Dest != NULL);

+

+  if ((Len == 0) || (NbufQue->BufSize <= Offset)) {

+    return 0;

+  }

+

+  if (NbufQue->BufSize - Offset < Len) {

+    Len = NbufQue->BufSize - Offset;

+  }

+

+  //

+  // skip to the Offset

+  //

+  Cur   = 0;

+  Nbuf  = NULL;

+

+  NET_LIST_FOR_EACH (Entry, &NbufQue->BufList) {

+    Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);

+

+    if (Offset < Cur + Nbuf->TotalSize) {

+      break;

+    }

+

+    Cur += Nbuf->TotalSize;

+  }

+

+  //

+  // Copy the data in the first buffer.

+  //

+  Skip  = Offset - Cur;

+  Left  = Nbuf->TotalSize - Skip;

+

+  if (Len < Left) {

+    return NetbufCopy (Nbuf, Skip, Len, Dest);

+  }

+

+  NetbufCopy (Nbuf, Skip, Left, Dest);

+  Dest  += Left;

+  Len   -= Left;

+  Copied = Left;

+

+  //

+  // Iterate over the others

+  //

+  Entry = Entry->ForwardLink;

+

+  while ((Len > 0) && (Entry != &NbufQue->BufList)) {

+    Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);

+

+    if (Len > Nbuf->TotalSize) {

+      Len -= Nbuf->TotalSize;

+      Copied += Nbuf->TotalSize;

+

+      NetbufCopy (Nbuf, 0, Nbuf->TotalSize, Dest);

+      Dest += Nbuf->TotalSize;

+

+    } else {

+      NetbufCopy (Nbuf, 0, Len, Dest);

+      Copied += Len;

+      break;

+    }

+

+    Entry = Entry->ForwardLink;

+  }

+

+  return Copied;

+}

+

+

+/**

+  Trim some data from the queue header, release the buffer if

+  whole buffer is trimmed.

+

+  @param  NbufQue               Pointer to the net buffer queue.

+  @param  Len                   Length of the data to trim.

+

+  @retval UINTN                 The length of the data trimmed.

+

+**/

+UINT32

+NetbufQueTrim (

+  IN NET_BUF_QUEUE          *NbufQue,

+  IN UINT32                 Len

+  )

+{

+  NET_LIST_ENTRY            *Entry;

+  NET_LIST_ENTRY            *Next;

+  NET_BUF                   *Nbuf;

+  UINT32                    Trimmed;

+

+  NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);

+

+  if (Len == 0) {

+    return 0;

+  }

+

+  if (Len > NbufQue->BufSize) {

+    Len = NbufQue->BufSize;

+  }

+

+  NbufQue->BufSize -= Len;

+  Trimmed = 0;

+

+  NET_LIST_FOR_EACH_SAFE (Entry, Next, &NbufQue->BufList) {

+    Nbuf = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);

+

+    if (Len >= Nbuf->TotalSize) {

+      Trimmed += Nbuf->TotalSize;

+      Len -= Nbuf->TotalSize;

+

+      NetListRemoveEntry (Entry);

+      NetbufFree (Nbuf);

+

+      NbufQue->BufNum--;

+

+      if (Len == 0) {

+        break;

+      }

+

+    } else {

+      Trimmed += NetbufTrim (Nbuf, Len, NET_BUF_HEAD);

+      break;

+    }

+  }

+

+  return Trimmed;

+}

+

+

+/**

+  Flush the net buffer queue.

+

+  @param  NbufQue               Pointer to the queue to be flushed.

+

+  @return None.

+

+**/

+VOID

+NetbufQueFlush (

+  IN NET_BUF_QUEUE          *NbufQue

+  )

+{

+  NET_CHECK_SIGNATURE (NbufQue, NET_QUE_SIGNATURE);

+

+  NetbufFreeList (&NbufQue->BufList);

+

+  NbufQue->BufNum   = 0;

+  NbufQue->BufSize  = 0;

+}

+

+

+/**

+  Compute checksum for a bulk of data.

+

+  @param  Bulk                  Pointer to the data.

+  @param  Len                   Length of the data, in bytes.

+

+  @retval UINT16                The computed checksum.

+

+**/

+UINT16

+NetblockChecksum (

+  IN UINT8                  *Bulk,

+  IN UINT32                 Len

+  )

+{

+  register UINT32           Sum;

+

+  Sum = 0;

+

+  while (Len > 1) {

+    Sum += *(UINT16 *) Bulk;

+    Bulk += 2;

+    Len -= 2;

+  }

+

+  //

+  // Add left-over byte, if any

+  //

+  if (Len > 0) {

+    Sum += *(UINT8 *) Bulk;

+  }

+

+  //

+  // Fold 32-bit sum to 16 bits

+  //

+  while (Sum >> 16) {

+    Sum = (Sum & 0xffff) + (Sum >> 16);

+

+  }

+

+  return (UINT16) Sum;

+}

+

+

+/**

+  Add two checksums.

+

+  @param  Checksum1             The first checksum to be added.

+  @param  Checksum2             The second checksum to be added.

+

+  @retval UINT16                The new checksum.

+

+**/

+UINT16

+NetAddChecksum (

+  IN UINT16                 Checksum1,

+  IN UINT16                 Checksum2

+  )

+{

+  UINT32                    Sum;

+

+  Sum = Checksum1 + Checksum2;

+

+  //

+  // two UINT16 can only add up to a carry of 1.

+  //

+  if (Sum >> 16) {

+    Sum = (Sum & 0xffff) + 1;

+

+  }

+

+  return (UINT16) Sum;

+}

+

+

+/**

+  Compute the checksum for a NET_BUF.

+

+  @param  Nbuf                  Pointer to the net buffer.

+

+  @retval UINT16                The computed checksum.

+

+**/

+UINT16

+NetbufChecksum (

+  IN NET_BUF                *Nbuf

+  )

+{

+  NET_BLOCK_OP              *BlockOp;

+  UINT32                    Offset;

+  UINT16                    TotalSum;

+  UINT16                    BlockSum;

+  UINT32                    Index;

+

+  NET_CHECK_SIGNATURE (Nbuf, NET_BUF_SIGNATURE);

+

+  TotalSum  = 0;

+  Offset    = 0;

+  BlockOp   = Nbuf->BlockOp;

+

+  for (Index = 0; Index < Nbuf->BlockOpNum; Index++) {

+    if (BlockOp[Index].Size == 0) {

+      continue;

+    }

+

+    BlockSum = NetblockChecksum (BlockOp[Index].Head, BlockOp[Index].Size);

+

+    if (Offset & 0x01) {

+      //

+      // The checksum starts with an odd byte, swap

+      // the checksum before added to total checksum

+      //

+      BlockSum = NET_SWAP_SHORT (BlockSum);

+    }

+

+    TotalSum = NetAddChecksum (BlockSum, TotalSum);

+    Offset  += BlockOp[Index].Size;

+  }

+

+  return TotalSum;

+}

+

+

+/**

+  Compute the checksum for TCP/UDP pseudo header.

+  Src, Dst are in network byte order. and Len is

+  in host byte order.

+

+  @param  Src                   The source address of the packet.

+  @param  Dst                   The destination address of the packet.

+  @param  Proto                 The protocol type of the packet.

+  @param  Len                   The length of the packet.

+

+  @retval UINT16                The computed checksum.

+

+**/

+UINT16

+NetPseudoHeadChecksum (

+  IN IP4_ADDR               Src,

+  IN IP4_ADDR               Dst,

+  IN UINT8                  Proto,

+  IN UINT16                 Len

+  )

+{

+  NET_PSEUDO_HDR            Hdr;

+

+  //

+  // Zero the memory to relieve align problems

+  //

+  NetZeroMem (&Hdr, sizeof (Hdr));

+

+  Hdr.SrcIp     = Src;

+  Hdr.DstIp     = Dst;

+  Hdr.Protocol  = Proto;

+  Hdr.Len       = HTONS (Len);

+

+  return NetblockChecksum ((UINT8 *) &Hdr, sizeof (Hdr));

+}

diff --git a/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c b/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c
new file mode 100644
index 0000000000..84bc295bb1
--- /dev/null
+++ b/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.c
@@ -0,0 +1,727 @@
+/** @file

+

+Copyright (c) 2006 - 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:

+

+  Udp4Io.c

+

+Abstract:

+

+  Help functions to access UDP service, it is used by both the DHCP and MTFTP.

+

+

+**/

+

+#include <PiDxe.h>

+

+#include <Protocol/Udp4.h>

+

+#include <Library/UdpIoLib.h>

+#include <Library/BaseLib.h>

+#include <Library/DebugLib.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Library/MemoryAllocationLib.h>

+

+STATIC

+VOID

+EFIAPI

+UdpIoOnDgramSent (

+  IN EFI_EVENT              Event,

+  IN VOID                   *Context

+  );

+

+STATIC

+VOID

+EFIAPI

+UdpIoOnDgramRcvd (

+  IN EFI_EVENT              Event,

+  IN VOID                   *Context

+  );

+

+

+/**

+  Wrap a transmit request into a UDP_TX_TOKEN.

+

+  @param  UdpIo                 The UdpIo port to send packet to

+  @param  Packet                The user's packet

+  @param  EndPoint              The local and remote access point

+  @param  Gateway               The overrided next hop

+  @param  CallBack              The function to call when transmission completed.

+  @param  Context               The opaque parameter to the call back

+

+  @return The wrapped transmission request or NULL if failed to allocate resources.

+

+**/

+STATIC

+UDP_TX_TOKEN *

+UdpIoWrapTx (

+  IN UDP_IO_PORT            *UdpIo,

+  IN NET_BUF                *Packet,

+  IN UDP_POINTS             *EndPoint, OPTIONAL

+  IN IP4_ADDR               Gateway,

+  IN UDP_IO_CALLBACK        CallBack,

+  IN VOID                   *Context

+  )

+{

+  UDP_TX_TOKEN              *Token;

+  EFI_UDP4_COMPLETION_TOKEN *UdpToken;

+  EFI_UDP4_TRANSMIT_DATA    *UdpTxData;

+  EFI_STATUS                Status;

+  UINT32                    Count;

+

+  Token = NetAllocatePool (sizeof (UDP_TX_TOKEN) +

+                           sizeof (EFI_UDP4_FRAGMENT_DATA) * (Packet->BlockOpNum - 1));

+

+  if (Token == NULL) {

+    return NULL;

+  }

+

+  Token->Signature  = UDP_IO_TX_SIGNATURE;

+  NetListInit (&Token->Link);

+

+  Token->UdpIo      = UdpIo;

+  Token->CallBack   = CallBack;

+  Token->Packet     = Packet;

+  Token->Context    = Context;

+

+  UdpToken          = &(Token->UdpToken);

+  UdpToken->Status  = EFI_NOT_READY;

+

+  Status = gBS->CreateEvent (

+                  EVT_NOTIFY_SIGNAL,

+                  TPL_CALLBACK,

+                  UdpIoOnDgramSent,

+                  Token,

+                  &UdpToken->Event

+                  );

+

+  if (EFI_ERROR (Status)) {

+    NetFreePool (Token);

+    return NULL;

+  }

+

+  UdpTxData                 = &Token->UdpTxData;

+  UdpToken->Packet.TxData   = UdpTxData;

+

+  UdpTxData->UdpSessionData = NULL;

+  UdpTxData->GatewayAddress = NULL;

+

+  if (EndPoint != NULL) {

+    EFI_IP4 (Token->UdpSession.SourceAddress)      = HTONL (EndPoint->LocalAddr);

+    EFI_IP4 (Token->UdpSession.DestinationAddress) = HTONL (EndPoint->RemoteAddr);

+    Token->UdpSession.SourcePort                   = EndPoint->LocalPort;

+    Token->UdpSession.DestinationPort              = EndPoint->RemotePort;

+    UdpTxData->UdpSessionData                      = &Token->UdpSession;

+  }

+

+  if (Gateway != 0) {

+    EFI_IP4 (Token->Gateway)  = HTONL (Gateway);

+    UdpTxData->GatewayAddress = &Token->Gateway;

+  }

+

+  UdpTxData->DataLength = Packet->TotalSize;

+  Count                 = Packet->BlockOpNum;

+  NetbufBuildExt (Packet, (NET_FRAGMENT *) UdpTxData->FragmentTable, &Count);

+  UdpTxData->FragmentCount = Count;

+

+  return Token;

+}

+

+

+/**

+  Free a UDP_TX_TOKEN. The event is closed and memory released.

+

+  @param  Token                 The UDP_TX_TOKEN to release.

+

+  @return None

+

+**/

+VOID

+UdpIoFreeTxToken (

+  IN UDP_TX_TOKEN           *Token

+  )

+{

+  gBS->CloseEvent (Token->UdpToken.Event);

+  NetFreePool (Token);

+}

+

+

+/**

+  Create a UDP_RX_TOKEN to wrap the request.

+

+  @param  UdpIo                 The UdpIo to receive packets from

+  @param  CallBack              The function to call when receive finished.

+  @param  Context               The opaque parameter to the CallBack

+  @param  HeadLen               The head length to reserver for the packet.

+

+  @return The Wrapped request or NULL if failed to allocate resources.

+

+**/

+UDP_RX_TOKEN *

+UdpIoCreateRxToken (

+  IN UDP_IO_PORT            *UdpIo,

+  IN UDP_IO_CALLBACK        CallBack,

+  IN VOID                   *Context,

+  IN UINT32                 HeadLen

+  )

+{

+  UDP_RX_TOKEN              *Token;

+  EFI_STATUS                Status;

+

+  Token = NetAllocatePool (sizeof (UDP_RX_TOKEN));

+

+  if (Token == NULL) {

+    return NULL;

+  }

+

+  Token->Signature              = UDP_IO_RX_SIGNATURE;

+  Token->UdpIo                  = UdpIo;

+  Token->CallBack               = CallBack;

+  Token->Context                = Context;

+  Token->HeadLen                = HeadLen;

+

+  Token->UdpToken.Status        = EFI_NOT_READY;

+  Token->UdpToken.Packet.RxData = NULL;

+

+  Status = gBS->CreateEvent (

+                  EVT_NOTIFY_SIGNAL,

+                  TPL_CALLBACK,

+                  UdpIoOnDgramRcvd,

+                  Token,

+                  &Token->UdpToken.Event

+                  );

+

+  if (EFI_ERROR (Status)) {

+    NetFreePool (Token);

+    return NULL;

+  }

+

+  return Token;

+}

+

+

+/**

+  Free a receive request wrap.

+

+  @param  Token                 The receive request to release.

+

+  @return None

+

+**/

+VOID

+UdpIoFreeRxToken (

+  IN UDP_RX_TOKEN           *Token

+  )

+{

+  gBS->CloseEvent (Token->UdpToken.Event);

+  NetFreePool (Token);

+}

+

+

+/**

+  Create a UDP IO port to access the UDP service. It will

+  create and configure a UDP child.

+

+  @param  Controller            The controller that has the UDP service binding

+                                protocol installed.

+  @param  Image                 The image handle for the driver.

+  @param  Configure             The function to configure the created UDP child

+  @param  Context               The opaque parameter for the Configure funtion.

+

+  @return A point to just created UDP IO port or NULL if failed.

+

+**/

+UDP_IO_PORT *

+UdpIoCreatePort (

+  IN  EFI_HANDLE            Controller,

+  IN  EFI_HANDLE            Image,

+  IN  UDP_IO_CONFIG         Configure,

+  IN  VOID                  *Context

+  )

+{

+  UDP_IO_PORT               *UdpIo;

+  EFI_STATUS                Status;

+

+  ASSERT (Configure != NULL);

+

+  UdpIo = NetAllocatePool (sizeof (UDP_IO_PORT));

+

+  if (UdpIo == NULL) {

+    return NULL;

+  }

+

+  UdpIo->Signature    = UDP_IO_SIGNATURE;

+  NetListInit (&UdpIo->Link);

+  UdpIo->RefCnt       = 1;

+

+  UdpIo->Controller   = Controller;

+  UdpIo->Image        = Image;

+

+  NetListInit (&UdpIo->SentDatagram);

+  UdpIo->RecvRequest  = NULL;

+  UdpIo->UdpHandle    = NULL;

+

+  //

+  // Create a UDP child then open and configure it

+  //

+  Status = NetLibCreateServiceChild (

+             Controller,

+             Image,

+             &gEfiUdp4ServiceBindingProtocolGuid,

+             &UdpIo->UdpHandle

+             );

+

+  if (EFI_ERROR (Status)) {

+    goto FREE_MEM;

+  }

+

+  Status = gBS->OpenProtocol (

+                  UdpIo->UdpHandle,

+                  &gEfiUdp4ProtocolGuid,

+                  &UdpIo->Udp,

+                  Image,

+                  Controller,

+                  EFI_OPEN_PROTOCOL_BY_DRIVER

+                  );

+

+  if (EFI_ERROR (Status)) {

+    goto FREE_CHILD;

+  }

+

+  if (EFI_ERROR (Configure (UdpIo, Context))) {

+    goto CLOSE_PROTOCOL;

+  }

+

+  Status = UdpIo->Udp->GetModeData (UdpIo->Udp, NULL, NULL, NULL, &UdpIo->SnpMode);

+

+  if (EFI_ERROR (Status)) {

+    goto CLOSE_PROTOCOL;

+  }

+

+  return UdpIo;

+

+CLOSE_PROTOCOL:

+  gBS->CloseProtocol (UdpIo->UdpHandle, &gEfiUdp4ProtocolGuid, Image, Controller);

+

+FREE_CHILD:

+  NetLibDestroyServiceChild (

+    Controller,

+    Image,

+    &gEfiUdp4ServiceBindingProtocolGuid,

+    UdpIo->UdpHandle

+    );

+

+FREE_MEM:

+  NetFreePool (UdpIo);

+  return NULL;

+}

+

+

+/**

+  Cancel all the sent datagram that pass the selection of ToCancel.

+  If ToCancel is NULL, all the datagrams are cancelled.

+

+  @param  UdpIo                 The UDP IO port to cancel packet

+  @param  IoStatus              The IoStatus to return to the packet owners.

+  @param  ToCancel              The select funtion to test whether to cancel this

+                                packet or not.

+  @param  Context               The opaque parameter to the ToCancel.

+

+  @return None

+

+**/

+STATIC

+VOID

+UdpIoCancelDgrams (

+  IN UDP_IO_PORT            *UdpIo,

+  IN EFI_STATUS             IoStatus,

+  IN UDP_IO_TO_CANCEL       ToCancel,        OPTIONAL

+  IN VOID                   *Context

+  )

+{

+  NET_LIST_ENTRY            *Entry;

+  NET_LIST_ENTRY            *Next;

+  UDP_TX_TOKEN              *Token;

+

+  NET_LIST_FOR_EACH_SAFE (Entry, Next, &UdpIo->SentDatagram) {

+    Token = NET_LIST_USER_STRUCT (Entry, UDP_TX_TOKEN, Link);

+

+    if ((ToCancel == NULL) || (ToCancel (Token, Context))) {

+      NetListRemoveEntry (Entry);

+      UdpIo->Udp->Cancel (UdpIo->Udp, &Token->UdpToken);

+      Token->CallBack (Token->Packet, NULL, IoStatus, Token->Context);

+      UdpIoFreeTxToken (Token);

+    }

+  }

+}

+

+

+/**

+  Free the UDP IO port and all its related resources including

+  all the transmitted packet.

+

+  @param  UdpIo                 The UDP IO port to free.

+

+  @retval EFI_SUCCESS           The UDP IO port is freed.

+

+**/

+EFI_STATUS

+UdpIoFreePort (

+  IN  UDP_IO_PORT           *UdpIo

+  )

+{

+  UDP_RX_TOKEN  *RxToken;

+

+  //

+  // Cancel all the sent datagram and receive requests. The

+  // callbacks of transmit requests are executed to allow the

+  // caller to release the resource. The callback of receive

+  // request are NOT executed. This is because it is most

+  // likely that the current user of the UDP IO port is closing

+  // itself.

+  //

+  UdpIoCancelDgrams (UdpIo, EFI_ABORTED, NULL, NULL);

+

+  if ((RxToken = UdpIo->RecvRequest) != NULL) {

+    UdpIo->RecvRequest = NULL;

+    UdpIo->Udp->Cancel (UdpIo->Udp, &RxToken->UdpToken);

+    UdpIoFreeRxToken (RxToken);

+  }

+

+  //

+  // Close then destory the UDP child

+  //

+  gBS->CloseProtocol (

+         UdpIo->UdpHandle,

+         &gEfiUdp4ProtocolGuid,

+         UdpIo->Image,

+         UdpIo->Controller

+         );

+

+  NetLibDestroyServiceChild (

+    UdpIo->Controller,

+    UdpIo->Image,

+    &gEfiUdp4ServiceBindingProtocolGuid,

+    UdpIo->UdpHandle

+    );

+

+  NetListRemoveEntry (&UdpIo->Link);

+  NetFreePool (UdpIo);

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Clean up the UDP IO port. It will release all the transmitted

+  datagrams and receive request. It will also configure NULL the

+  UDP child.

+

+  @param  UdpIo                 UDP IO port to clean up.

+

+  @return None

+

+**/

+VOID

+UdpIoCleanPort (

+  IN  UDP_IO_PORT           *UdpIo

+  )

+{

+  UDP_RX_TOKEN              *RxToken;

+

+  //

+  // Cancel all the sent datagram and receive requests.

+  //

+  UdpIoCancelDgrams (UdpIo, EFI_ABORTED, NULL, NULL);

+

+  if ((RxToken = UdpIo->RecvRequest) != NULL) {

+    UdpIo->RecvRequest = NULL;

+    UdpIo->Udp->Cancel (UdpIo->Udp, &RxToken->UdpToken);

+    UdpIoFreeRxToken (RxToken);

+  }

+

+  UdpIo->Udp->Configure (UdpIo->Udp, NULL);

+}

+

+

+/**

+  The callback function when the packet is sent by UDP.

+  It will remove the packet from the local list then call

+  the packet owner's callback function.

+

+  @param  Event                 The event signalled.

+  @param  Context               The UDP TX Token.

+

+  @return None

+

+**/

+STATIC

+VOID

+EFIAPI

+UdpIoOnDgramSent (

+  IN EFI_EVENT              Event,

+  IN VOID                   *Context

+  )

+{

+  UDP_TX_TOKEN              *Token;

+

+  Token   = (UDP_TX_TOKEN *) Context;

+  ASSERT (Token->Signature == UDP_IO_TX_SIGNATURE);

+

+  NetListRemoveEntry (&Token->Link);

+  Token->CallBack (Token->Packet, NULL, Token->UdpToken.Status, Token->Context);

+

+  UdpIoFreeTxToken (Token);

+}

+

+

+/**

+  Send a packet through the UDP IO port.

+

+  @param  UdpIo                 The UDP IO Port to send the packet through

+  @param  Packet                The packet to send

+  @param  EndPoint              The local and remote access point

+  @param  Gateway               The gateway to use

+  @param  CallBack              The call back function to call when packet is

+                                transmitted or failed.

+  @param  Context               The opque parameter to the CallBack

+

+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource for the packet

+  @retval EFI_SUCCESS           The packet is successfully delivered to UDP  for

+                                transmission.

+

+**/

+EFI_STATUS

+UdpIoSendDatagram (

+  IN  UDP_IO_PORT           *UdpIo,

+  IN  NET_BUF               *Packet,

+  IN  UDP_POINTS            *EndPoint, OPTIONAL

+  IN  IP4_ADDR              Gateway,

+  IN  UDP_IO_CALLBACK       CallBack,

+  IN  VOID                  *Context

+  )

+{

+  UDP_TX_TOKEN              *Token;

+  EFI_STATUS                Status;

+

+  Token = UdpIoWrapTx (UdpIo, Packet, EndPoint, Gateway, CallBack, Context);

+

+  if (Token == NULL) {

+    return EFI_OUT_OF_RESOURCES;

+  }

+

+  Status = UdpIo->Udp->Transmit (UdpIo->Udp, &Token->UdpToken);

+

+  if (EFI_ERROR (Status)) {

+    UdpIoFreeTxToken (Token);

+    return Status;

+  }

+

+  NetListInsertHead (&UdpIo->SentDatagram, &Token->Link);

+  return EFI_SUCCESS;

+}

+

+

+/**

+  The selection function to cancel a single sent datagram.

+

+  @param  Token                 The UDP TX token to test againist.

+  @param  Context               The context

+

+  @return TRUE if the packet is to be cancelled, otherwise FALSE.

+

+**/

+STATIC

+BOOLEAN

+UdpIoCancelSingleDgram (

+  IN UDP_TX_TOKEN           *Token,

+  IN VOID                   *Context

+  )

+{

+  NET_BUF                   *Packet;

+

+  Packet = (NET_BUF *) Context;

+

+  if (Token->Packet == Packet) {

+    return TRUE;

+  }

+

+  return FALSE;

+}

+

+

+/**

+  Cancel a single sent datagram.

+

+  @param  UdpIo                 The UDP IO port to cancel the packet from

+  @param  Packet                The packet to cancel

+

+  @return None

+

+**/

+VOID

+UdpIoCancelSentDatagram (

+  IN  UDP_IO_PORT           *UdpIo,

+  IN  NET_BUF               *Packet

+  )

+{

+  UdpIoCancelDgrams (UdpIo, EFI_ABORTED, UdpIoCancelSingleDgram, Packet);

+}

+

+

+/**

+  Recycle the received UDP data.

+

+  @param  Context               The UDP_RX_TOKEN

+

+  @return None

+

+**/

+STATIC

+VOID

+UdpIoRecycleDgram (

+  IN VOID                   *Context

+  )

+{

+  UDP_RX_TOKEN              *Token;

+

+  Token = (UDP_RX_TOKEN *) Context;

+  gBS->SignalEvent (Token->UdpToken.Packet.RxData->RecycleSignal);

+  UdpIoFreeRxToken (Token);

+}

+

+

+/**

+  The event handle for UDP receive request. It will build

+  a NET_BUF from the recieved UDP data, then deliver it

+  to the receiver.

+

+  @param  Event                 The UDP receive request event

+  @param  Context               The UDP RX token.

+

+  @return None

+

+**/

+STATIC

+VOID

+EFIAPI

+UdpIoOnDgramRcvd (

+  IN EFI_EVENT              Event,

+  IN VOID                   *Context

+  )

+{

+  EFI_UDP4_COMPLETION_TOKEN *UdpToken;

+  EFI_UDP4_RECEIVE_DATA     *UdpRxData;

+  EFI_UDP4_SESSION_DATA     *UdpSession;

+  UDP_RX_TOKEN              *Token;

+  UDP_POINTS                Points;

+  NET_BUF                   *Netbuf;

+

+  Token   = (UDP_RX_TOKEN *) Context;

+

+  ASSERT ((Token->Signature == UDP_IO_RX_SIGNATURE) &&

+          (Token == Token->UdpIo->RecvRequest));

+

+  //

+  // Clear the receive request first in case that the caller

+  // wants to restart the receive in the callback.

+  //

+  Token->UdpIo->RecvRequest = NULL;

+

+  UdpToken  = &Token->UdpToken;

+  UdpRxData = UdpToken->Packet.RxData;

+

+  if (EFI_ERROR (UdpToken->Status) || (UdpRxData == NULL)) {

+    Token->CallBack (NULL, NULL, UdpToken->Status, Token->Context);

+    UdpIoFreeRxToken (Token);

+

+    goto ON_EXIT;

+  }

+

+  //

+  // Build a NET_BUF from the UDP receive data, then deliver it up.

+  //

+  Netbuf = NetbufFromExt (

+             (NET_FRAGMENT *) UdpRxData->FragmentTable,

+             UdpRxData->FragmentCount,

+             0,

+             (UINT32) Token->HeadLen,

+             UdpIoRecycleDgram,

+             Token

+             );

+

+  if (Netbuf == NULL) {

+    gBS->SignalEvent (UdpRxData->RecycleSignal);

+    Token->CallBack (NULL, NULL, EFI_OUT_OF_RESOURCES, Token->Context);

+

+    UdpIoFreeRxToken (Token);

+    goto ON_EXIT;

+  }

+

+  UdpSession        = &UdpRxData->UdpSession;

+  Points.LocalAddr  = EFI_NTOHL (UdpSession->DestinationAddress);

+  Points.LocalPort  = UdpSession->DestinationPort;

+  Points.RemoteAddr = EFI_NTOHL (UdpSession->SourceAddress);

+  Points.RemotePort = UdpSession->SourcePort;

+

+  Token->CallBack (Netbuf, &Points, EFI_SUCCESS, Token->Context);

+

+ON_EXIT:

+  return;

+}

+

+

+/**

+  Issue a receive request to the UDP IO port.

+

+  @param  UdpIo                 The UDP IO port to recieve the packet from.

+  @param  CallBack              The call back function to execute when receive

+                                finished.

+  @param  Context               The opque context to the call back

+  @param  HeadLen               The lenght of the application's header

+

+  @retval EFI_ALREADY_STARTED   There is already a pending receive request. Only

+                                one receive request is supported.

+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate some resource.

+  @retval EFI_SUCCESS           The receive request is issued successfully.

+

+**/

+EFI_STATUS

+UdpIoRecvDatagram (

+  IN  UDP_IO_PORT           *UdpIo,

+  IN  UDP_IO_CALLBACK       CallBack,

+  IN  VOID                  *Context,

+  IN  UINT32                HeadLen

+  )

+{

+  UDP_RX_TOKEN              *Token;

+  EFI_STATUS                Status;

+

+  if (UdpIo->RecvRequest != NULL) {

+    return EFI_ALREADY_STARTED;

+  }

+

+  Token = UdpIoCreateRxToken (UdpIo, CallBack, Context, HeadLen);

+

+  if (Token == NULL) {

+    return EFI_OUT_OF_RESOURCES;

+  }

+

+  Status = UdpIo->Udp->Receive (UdpIo->Udp, &Token->UdpToken);

+

+  if (EFI_ERROR (Status)) {

+    UdpIoFreeRxToken (Token);

+    return Status;

+  }

+

+  UdpIo->RecvRequest = Token;

+  return EFI_SUCCESS;

+}

diff --git a/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.inf b/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.inf
new file mode 100644
index 0000000000..421eaa011a
--- /dev/null
+++ b/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.inf
@@ -0,0 +1,65 @@
+#/** @file

+# Component name for module NetLib

+#

+# FIX ME!

+# Copyright (c) 2006, Intel Corporation. All right reserved.

+#

+#  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.

+#

+#

+#**/

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = DxeUpdIoDxe

+  FILE_GUID                      = 7E615AA1-41EE-49d4-B7E9-1D7A60AA5C8D

+  MODULE_TYPE                    = DXE_DRIVER

+  VERSION_STRING                 = 1.0

+  LIBRARY_CLASS                  = UdpIoLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER

+  EDK_RELEASE_VERSION            = 0x00020000

+  EFI_SPECIFICATION_VERSION      = 0x00020000

+

+

+#

+# The following information is for reference only and not required by the build tools.

+#

+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC

+#

+

+[Sources.common]

+  DxeUdpIoLib.c

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+

+

+[LibraryClasses]

+  MemoryAllocationLib

+  UefiLib

+  BaseLib

+  UefiBootServicesTableLib

+  UefiRuntimeServicesTableLib

+  BaseMemoryLib

+  DebugLib

+  PrintLib

+

+

+[Protocols]

+  gEfiIp4ProtocolGuid                           # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverDiagnosticsProtocolGuid             # PROTOCOL ALWAYS_CONSUMED

+  gEfiUdp4ServiceBindingProtocolGuid            # PROTOCOL ALWAYS_CONSUMED

+  gEfiLoadedImageProtocolGuid                   # PROTOCOL ALWAYS_CONSUMED

+  gEfiIp4ServiceBindingProtocolGuid             # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverConfigurationProtocolGuid           # PROTOCOL ALWAYS_CONSUMED

+  gEfiSimpleNetworkProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+  gEfiDriverBindingProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+  gEfiUdp4ProtocolGuid                          # PROTOCOL ALWAYS_CONSUMED

+  gEfiComponentNameProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED

+

diff --git a/MdeModulePkg/MdeModulePkg.dsc b/MdeModulePkg/MdeModulePkg.dsc
index 73cb07a97c..b461ecc56b 100644
--- a/MdeModulePkg/MdeModulePkg.dsc
+++ b/MdeModulePkg/MdeModulePkg.dsc
@@ -127,6 +127,8 @@
   ScsiLib|$(WORKSPACE)/MdePkg/Library/UefiScsiLib/UefiScsiLib.inf

   FrameworkHiiLib|$(WORKSPACE)/IntelFrameworkPkg/Library/FrameworkHiiLib/HiiLib.inf

   UsbLib|$(WORKSPACE)/MdePkg/Library/UefiUsbLib/UefiUsbLib.inf

+  NetLib|$(WORKSPACE)/MdeModulePkg/Library/DxeNetLib/DxeNetLib.inf

+  IpIoLib|$(WORKSPACE)/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.inf

 

 [LibraryClasses.common.DXE_RUNTIME_DRIVER]

   HobLib|$(WORKSPACE)/MdePkg/Library/DxeHobLib/DxeHobLib.inf

@@ -394,6 +396,12 @@
   $(WORKSPACE)/MdeModulePkg/Library/PeiPerformanceLib/PeiPerformanceLib.inf

   $(WORKSPACE)/MdeModulePkg/Library/EdkDxePrintLib/EdkDxePrintLib.inf

 

+  $(WORKSPACE)/MdeModulePkg/Library/DxeNetLib/DxeNetLib.inf

+  $(WORKSPACE)/MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.inf

+  $(WORKSPACE)/MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.inf

+

+  $(WORKSPACE)/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.inf

+

   $(WORKSPACE)/MdeModulePkg/Application/HelloWorld/HelloWorld.inf

 

   $(WORKSPACE)/MdeModulePkg/Bus/Pci/AtapiPassThruDxe/AtapiPassThru.inf