4 Copyright (c) 2005 - 2010, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 Create an empty assemble entry for the packet identified by
20 (Dst, Src, Id, Protocol). The default life for the packet is
23 @param[in] Dst The destination address
24 @param[in] Src The source address
25 @param[in] Id The ID field in IP header
26 @param[in] Protocol The protocol field in IP header
28 @return NULL if failed to allocate memory for the entry, otherwise
29 the point to just created reassemble entry.
33 Ip4CreateAssembleEntry (
41 IP4_ASSEMBLE_ENTRY
*Assemble
;
43 Assemble
= AllocatePool (sizeof (IP4_ASSEMBLE_ENTRY
));
45 if (Assemble
== NULL
) {
49 InitializeListHead (&Assemble
->Link
);
50 InitializeListHead (&Assemble
->Fragments
);
55 Assemble
->Protocol
= Protocol
;
56 Assemble
->TotalLen
= 0;
58 Assemble
->Head
= NULL
;
59 Assemble
->Info
= NULL
;
60 Assemble
->Life
= IP4_FRAGMENT_LIFE
;
67 Release all the fragments of a packet, then free the assemble entry.
69 @param[in] Assemble The assemble entry to free
73 Ip4FreeAssembleEntry (
74 IN IP4_ASSEMBLE_ENTRY
*Assemble
81 NET_LIST_FOR_EACH_SAFE (Entry
, Next
, &Assemble
->Fragments
) {
82 Fragment
= NET_LIST_USER_STRUCT (Entry
, NET_BUF
, List
);
84 RemoveEntryList (Entry
);
85 NetbufFree (Fragment
);
93 Initialize an already allocated assemble table. This is generally
94 the assemble table embedded in the IP4 service instance.
96 @param[in, out] Table The assemble table to initialize.
100 Ip4InitAssembleTable (
101 IN OUT IP4_ASSEMBLE_TABLE
*Table
106 for (Index
= 0; Index
< IP4_ASSEMLE_HASH_SIZE
; Index
++) {
107 InitializeListHead (&Table
->Bucket
[Index
]);
113 Clean up the assemble table: remove all the fragments
114 and assemble entries.
116 @param[in] Table The assemble table to clean up
120 Ip4CleanAssembleTable (
121 IN IP4_ASSEMBLE_TABLE
*Table
126 IP4_ASSEMBLE_ENTRY
*Assemble
;
129 for (Index
= 0; Index
< IP4_ASSEMLE_HASH_SIZE
; Index
++) {
130 NET_LIST_FOR_EACH_SAFE (Entry
, Next
, &Table
->Bucket
[Index
]) {
131 Assemble
= NET_LIST_USER_STRUCT (Entry
, IP4_ASSEMBLE_ENTRY
, Link
);
133 RemoveEntryList (Entry
);
134 Ip4FreeAssembleEntry (Assemble
);
141 Trim the packet to fit in [Start, End), and update the per
144 @param Packet Packet to trim
145 @param Start The sequence of the first byte to fit in
146 @param End One beyond the sequence of last byte to fit in.
151 IN OUT NET_BUF
*Packet
,
159 Info
= IP4_GET_CLIP_INFO (Packet
);
161 ASSERT (Info
->Start
+ Info
->Length
== Info
->End
);
162 ASSERT ((Info
->Start
< End
) && (Start
< Info
->End
));
164 if (Info
->Start
< Start
) {
165 Len
= Start
- Info
->Start
;
167 NetbufTrim (Packet
, (UINT32
) Len
, NET_BUF_HEAD
);
172 if (End
< Info
->End
) {
173 Len
= End
- Info
->End
;
175 NetbufTrim (Packet
, (UINT32
) Len
, NET_BUF_TAIL
);
183 Release all the fragments of the packet. This is the callback for
184 the assembled packet's OnFree. It will free the assemble entry,
185 which in turn will free all the fragments of the packet.
187 @param[in] Arg The assemble entry to free
196 Ip4FreeAssembleEntry ((IP4_ASSEMBLE_ENTRY
*) Arg
);
201 Reassemble the IP fragments. If all the fragments of the packet
202 have been received, it will wrap the packet in a net buffer then
203 return it to caller. If the packet can't be assembled, NULL is
206 @param Table The assemble table used. New assemble entry will be created
207 if the Packet is from a new chain of fragments.
208 @param Packet The fragment to assemble. It might be freed if the fragment
209 can't be re-assembled.
211 @return NULL if the packet can't be reassemble. The point to just assembled
212 packet if all the fragments of the packet have arrived.
217 IN OUT IP4_ASSEMBLE_TABLE
*Table
,
218 IN OUT NET_BUF
*Packet
224 IP4_ASSEMBLE_ENTRY
*Assemble
;
232 IpHead
= Packet
->Ip
.Ip4
;
233 This
= IP4_GET_CLIP_INFO (Packet
);
235 ASSERT (IpHead
!= NULL
);
238 // First: find the related assemble entry
241 Index
= IP4_ASSEMBLE_HASH (IpHead
->Dst
, IpHead
->Src
, IpHead
->Id
, IpHead
->Protocol
);
243 NET_LIST_FOR_EACH (Cur
, &Table
->Bucket
[Index
]) {
244 Assemble
= NET_LIST_USER_STRUCT (Cur
, IP4_ASSEMBLE_ENTRY
, Link
);
246 if ((Assemble
->Dst
== IpHead
->Dst
) && (Assemble
->Src
== IpHead
->Src
) &&
247 (Assemble
->Id
== IpHead
->Id
) && (Assemble
->Protocol
== IpHead
->Protocol
)) {
253 // Create a new assemble entry if no assemble entry is related to this packet
255 if (Cur
== &Table
->Bucket
[Index
]) {
256 Assemble
= Ip4CreateAssembleEntry (
263 if (Assemble
== NULL
) {
267 InsertHeadList (&Table
->Bucket
[Index
], &Assemble
->Link
);
270 // Assemble shouldn't be NULL here
272 ASSERT (Assemble
!= NULL
);
275 // Find the point to insert the packet: before the first
276 // fragment with THIS.Start < CUR.Start. the previous one
277 // has PREV.Start <= THIS.Start < CUR.Start.
279 Head
= &Assemble
->Fragments
;
281 NET_LIST_FOR_EACH (Cur
, Head
) {
282 Fragment
= NET_LIST_USER_STRUCT (Cur
, NET_BUF
, List
);
284 if (This
->Start
< IP4_GET_CLIP_INFO (Fragment
)->Start
) {
290 // Check whether the current fragment overlaps with the previous one.
291 // It holds that: PREV.Start <= THIS.Start < THIS.End. Only need to
292 // check whether THIS.Start < PREV.End for overlap. If two fragments
293 // overlaps, trim the overlapped part off THIS fragment.
295 if ((Cur
!= Head
) && ((Prev
= Cur
->BackLink
) != Head
)) {
296 Fragment
= NET_LIST_USER_STRUCT (Prev
, NET_BUF
, List
);
297 Node
= IP4_GET_CLIP_INFO (Fragment
);
299 if (This
->Start
< Node
->End
) {
300 if (This
->End
<= Node
->End
) {
305 Ip4TrimPacket (Packet
, Node
->End
, This
->End
);
310 // Insert the fragment into the packet. The fragment may be removed
311 // from the list by the following checks.
313 NetListInsertBefore (Cur
, &Packet
->List
);
316 // Check the packets after the insert point. It holds that:
317 // THIS.Start <= NODE.Start < NODE.End. The equality holds
318 // if PREV and NEXT are continuous. THIS fragment may fill
319 // several holes. Remove the completely overlapped fragments
321 while (Cur
!= Head
) {
322 Fragment
= NET_LIST_USER_STRUCT (Cur
, NET_BUF
, List
);
323 Node
= IP4_GET_CLIP_INFO (Fragment
);
326 // Remove fragments completely overlapped by this fragment
328 if (Node
->End
<= This
->End
) {
329 Cur
= Cur
->ForwardLink
;
331 RemoveEntryList (&Fragment
->List
);
332 Assemble
->CurLen
-= Node
->Length
;
334 NetbufFree (Fragment
);
339 // The conditions are: THIS.Start <= NODE.Start, and THIS.End <
340 // NODE.End. Two fragments overlaps if NODE.Start < THIS.End.
341 // If two fragments start at the same offset, remove THIS fragment
342 // because ((THIS.Start == NODE.Start) && (THIS.End < NODE.End)).
344 if (Node
->Start
< This
->End
) {
345 if (This
->Start
== Node
->Start
) {
346 RemoveEntryList (&Packet
->List
);
350 Ip4TrimPacket (Packet
, This
->Start
, Node
->Start
);
357 // Update the assemble info: increase the current length. If it is
358 // the frist fragment, update the packet's IP head and per packet
359 // info. If it is the last fragment, update the total length.
361 Assemble
->CurLen
+= This
->Length
;
363 if (This
->Start
== 0) {
365 // Once the first fragment is enqueued, it can't be removed
366 // from the fragment list. So, Assemble->Head always point
367 // to valid memory area.
369 ASSERT (Assemble
->Head
== NULL
);
371 Assemble
->Head
= IpHead
;
372 Assemble
->Info
= IP4_GET_CLIP_INFO (Packet
);
376 // Don't update the length more than once.
378 if (IP4_LAST_FRAGMENT (IpHead
->Fragment
) && (Assemble
->TotalLen
== 0)) {
379 Assemble
->TotalLen
= This
->End
;
383 // Deliver the whole packet if all the fragments received.
384 // All fragments received if:
385 // 1. received the last one, so, the total length is know
386 // 2. received all the data. If the last fragment on the
387 // queue ends at the total length, all data is received.
389 if ((Assemble
->TotalLen
!= 0) && (Assemble
->CurLen
>= Assemble
->TotalLen
)) {
391 RemoveEntryList (&Assemble
->Link
);
394 // If the packet is properly formated, the last fragment's End
395 // equals to the packet's total length. Otherwise, the packet
396 // is a fake, drop it now.
398 Fragment
= NET_LIST_USER_STRUCT (Head
->BackLink
, NET_BUF
, List
);
400 if (IP4_GET_CLIP_INFO (Fragment
)->End
!= Assemble
->TotalLen
) {
401 Ip4FreeAssembleEntry (Assemble
);
406 // Wrap the packet in a net buffer then deliver it up
408 NewPacket
= NetbufFromBufList (
409 &Assemble
->Fragments
,
416 if (NewPacket
== NULL
) {
417 Ip4FreeAssembleEntry (Assemble
);
421 NewPacket
->Ip
.Ip4
= Assemble
->Head
;
422 CopyMem (IP4_GET_CLIP_INFO (NewPacket
), Assemble
->Info
, sizeof (*IP4_GET_CLIP_INFO (NewPacket
)));
434 The callback function for the net buffer which wraps the packet processed by
435 IPsec. It releases the wrap packet and also signals IPsec to free the resources.
437 @param[in] Arg The wrap context
446 IP4_IPSEC_WRAP
*Wrap
;
448 Wrap
= (IP4_IPSEC_WRAP
*) Arg
;
450 if (Wrap
->IpSecRecycleSignal
!= NULL
) {
451 gBS
->SignalEvent (Wrap
->IpSecRecycleSignal
);
454 NetbufFree (Wrap
->Packet
);
462 The work function to locate IPsec protocol to process the inbound or
463 outbound IP packets. The process routine handls the packet with following
464 actions: bypass the packet, discard the packet, or protect the packet.
466 @param[in] IpSb The IP4 service instance.
467 @param[in, out] Head The The caller supplied IP4 header.
468 @param[in, out] Netbuf The IP4 packet to be processed by IPsec.
469 @param[in, out] Options The caller supplied options.
470 @param[in, out] OptionsLen The length of the option.
471 @param[in] Direction The directionality in an SPD entry,
472 EfiIPsecInBound or EfiIPsecOutBound.
473 @param[in] Context The token's wrap.
475 @retval EFI_SUCCESS The IPsec protocol is not available or disabled.
476 @retval EFI_SUCCESS The packet was bypassed and all buffers remain the same.
477 @retval EFI_SUCCESS The packet was protected.
478 @retval EFI_ACCESS_DENIED The packet was discarded.
479 @retval EFI_OUT_OF_RESOURCES There is no suffcient resource to complete the operation.
480 @retval EFI_BUFFER_TOO_SMALL The number of non-empty block is bigger than the
481 number of input data blocks when build a fragment table.
485 Ip4IpSecProcessPacket (
486 IN IP4_SERVICE
*IpSb
,
487 IN OUT IP4_HEAD
**Head
,
488 IN OUT NET_BUF
**Netbuf
,
489 IN OUT UINT8
**Options
,
490 IN OUT UINT32
*OptionsLen
,
491 IN EFI_IPSEC_TRAFFIC_DIR Direction
,
495 NET_FRAGMENT
*FragmentTable
;
496 NET_FRAGMENT
*OriginalFragmentTable
;
497 UINT32 FragmentCount
;
498 UINT32 OriginalFragmentCount
;
499 EFI_EVENT RecycleEvent
;
501 IP4_TXTOKEN_WRAP
*TxWrap
;
502 IP4_IPSEC_WRAP
*IpSecWrap
;
506 Status
= EFI_SUCCESS
;
510 FragmentTable
= NULL
;
511 TxWrap
= (IP4_TXTOKEN_WRAP
*) Context
;
512 FragmentCount
= Packet
->BlockOpNum
;
514 ZeroMem (&ZeroHead
, sizeof (IP4_HEAD
));
516 if (mIpSec
== NULL
) {
517 gBS
->LocateProtocol (&gEfiIpSecProtocolGuid
, NULL
, (VOID
**) &mIpSec
);
518 if (mIpSec
== NULL
) {
524 // Check whether the IPsec enable variable is set.
526 if (mIpSec
->DisabledFlag
) {
528 // If IPsec is disabled, restore the original MTU
530 IpSb
->MaxPacketSize
= IpSb
->OldMaxPacketSize
;
534 // If IPsec is enabled, use the MTU which reduce the IPsec header length.
536 IpSb
->MaxPacketSize
= IpSb
->OldMaxPacketSize
- IP4_MAX_IPSEC_HEADLEN
;
540 // Rebuild fragment table from netbuf to ease IPsec process.
542 FragmentTable
= AllocateZeroPool (FragmentCount
* sizeof (NET_FRAGMENT
));
544 if (FragmentTable
== NULL
) {
545 Status
= EFI_OUT_OF_RESOURCES
;
549 Status
= NetbufBuildExt (Packet
, FragmentTable
, &FragmentCount
);
552 // Record the original FragmentTable and count.
554 OriginalFragmentTable
= FragmentTable
;
555 OriginalFragmentCount
= FragmentCount
;
557 if (EFI_ERROR (Status
)) {
558 FreePool (FragmentTable
);
563 // Convert host byte order to network byte order
567 Status
= mIpSec
->ProcessExt (
575 (EFI_IPSEC_FRAGMENT_DATA
**) (&FragmentTable
),
581 // Convert back to host byte order
585 if (EFI_ERROR (Status
)) {
589 if (OriginalFragmentTable
== FragmentTable
&& OriginalFragmentCount
== FragmentCount
) {
593 if (Direction
== EfiIPsecOutBound
&& TxWrap
!= NULL
) {
595 TxWrap
->IpSecRecycleSignal
= RecycleEvent
;
596 TxWrap
->Packet
= NetbufFromExt (
604 if (TxWrap
->Packet
== NULL
) {
605 Status
= EFI_OUT_OF_RESOURCES
;
610 // Free orginal Netbuf.
612 NetIpSecNetbufFree (*Netbuf
);
613 *Netbuf
= TxWrap
->Packet
;
617 IpSecWrap
= AllocateZeroPool (sizeof (IP4_IPSEC_WRAP
));
619 if (IpSecWrap
== NULL
) {
623 IpSecWrap
->IpSecRecycleSignal
= RecycleEvent
;
624 IpSecWrap
->Packet
= Packet
;
625 Packet
= NetbufFromExt (
634 if (Packet
== NULL
) {
635 Status
= EFI_OUT_OF_RESOURCES
;
639 if (Direction
== EfiIPsecInBound
&& 0 != CompareMem (*Head
, &ZeroHead
, sizeof (IP4_HEAD
))) {
640 Ip4PrependHead (Packet
, *Head
, *Options
, *OptionsLen
);
641 Ip4NtohHead (Packet
->Ip
.Ip4
);
642 NetbufTrim (Packet
, ((*Head
)->HeadLen
<< 2), TRUE
);
645 IP4_GET_CLIP_INFO (Packet
),
646 IP4_GET_CLIP_INFO (IpSecWrap
->Packet
),
647 sizeof (IP4_CLIP_INFO
)
658 Pre-process the IPv4 packet. First validates the IPv4 packet, and
659 then reassembles packet if it is necessary.
661 @param[in] IpSb Pointer to IP4_SERVICE.
662 @param[in, out] Packet Pointer to the Packet to be processed.
663 @param[in] Head Pointer to the IP4_HEAD.
664 @param[in] Option Pointer to a buffer which contains the IPv4 option.
665 @param[in] OptionLen The length of Option in bytes.
666 @param[in] Flag The link layer flag for the packet received, such
669 @retval EFI_SEUCCESS The recieved packet is in well form.
670 @retval EFI_INVAILD_PARAMETER The recieved packet is malformed.
674 Ip4PreProcessPacket (
675 IN IP4_SERVICE
*IpSb
,
676 IN OUT NET_BUF
**Packet
,
689 // Check that the IP4 header is correctly formatted
691 if ((*Packet
)->TotalSize
< IP4_MIN_HEADLEN
) {
692 return EFI_INVALID_PARAMETER
;
695 HeadLen
= (Head
->HeadLen
<< 2);
696 TotalLen
= NTOHS (Head
->TotalLen
);
699 // Mnp may deliver frame trailer sequence up, trim it off.
701 if (TotalLen
< (*Packet
)->TotalSize
) {
702 NetbufTrim (*Packet
, (*Packet
)->TotalSize
- TotalLen
, FALSE
);
705 if ((Head
->Ver
!= 4) || (HeadLen
< IP4_MIN_HEADLEN
) ||
706 (TotalLen
< HeadLen
) || (TotalLen
!= (*Packet
)->TotalSize
)) {
707 return EFI_INVALID_PARAMETER
;
711 // Some OS may send IP packets without checksum.
713 Checksum
= (UINT16
) (~NetblockChecksum ((UINT8
*) Head
, HeadLen
));
715 if ((Head
->Checksum
!= 0) && (Checksum
!= 0)) {
716 return EFI_INVALID_PARAMETER
;
720 // Convert the IP header to host byte order, then get the per packet info.
722 (*Packet
)->Ip
.Ip4
= Ip4NtohHead (Head
);
724 Info
= IP4_GET_CLIP_INFO (*Packet
);
725 Info
->LinkFlag
= Flag
;
726 Info
->CastType
= Ip4GetHostCast (IpSb
, Head
->Dst
, Head
->Src
);
727 Info
->Start
= (Head
->Fragment
& IP4_HEAD_OFFSET_MASK
) << 3;
728 Info
->Length
= Head
->TotalLen
- HeadLen
;
729 Info
->End
= Info
->Start
+ Info
->Length
;
730 Info
->Status
= EFI_SUCCESS
;
733 // The packet is destinated to us if the CastType is non-zero.
735 if ((Info
->CastType
== 0) || (Info
->End
> IP4_MAX_PACKET_SIZE
)) {
736 return EFI_INVALID_PARAMETER
;
740 // Validate the options. Don't call the Ip4OptionIsValid if
741 // there is no option to save some CPU process.
744 if ((OptionLen
> 0) && !Ip4OptionIsValid (Option
, OptionLen
, TRUE
)) {
745 return EFI_INVALID_PARAMETER
;
749 // Trim the head off, after this point, the packet is headless.
750 // and Packet->TotalLen == Info->Length.
752 NetbufTrim (*Packet
, HeadLen
, TRUE
);
755 // Reassemble the packet if this is a fragment. The packet is a
756 // fragment if its head has MF (more fragment) set, or it starts
759 if (((Head
->Fragment
& IP4_HEAD_MF_MASK
) != 0) || (Info
->Start
!= 0)) {
761 // Drop the fragment if DF is set but it is fragmented. Gateway
762 // need to send a type 4 destination unreache ICMP message here.
764 if ((Head
->Fragment
& IP4_HEAD_DF_MASK
) != 0) {
765 return EFI_INVALID_PARAMETER
;
769 // The length of all but the last fragments is in the unit of 8 bytes.
771 if (((Head
->Fragment
& IP4_HEAD_MF_MASK
) != 0) && (Info
->Length
% 8 != 0)) {
772 return EFI_INVALID_PARAMETER
;
775 *Packet
= Ip4Reassemble (&IpSb
->Assemble
, *Packet
);
778 // Packet assembly isn't complete, start receive more packet.
780 if (*Packet
== NULL
) {
781 return EFI_INVALID_PARAMETER
;
789 The IP4 input routine. It is called by the IP4_INTERFACE when a
790 IP4 fragment is received from MNP.
792 @param[in] Ip4Instance The IP4 child that request the receive, most like
794 @param[in] Packet The IP4 packet received.
795 @param[in] IoStatus The return status of receive request.
796 @param[in] Flag The link layer flag for the packet received, such
798 @param[in] Context The IP4 service instance that own the MNP.
803 IN IP4_PROTOCOL
*Ip4Instance
,
805 IN EFI_STATUS IoStatus
,
817 IpSb
= (IP4_SERVICE
*) Context
;
820 if (EFI_ERROR (IoStatus
) || (IpSb
->State
== IP4_SERVICE_DESTORY
)) {
824 Head
= (IP4_HEAD
*) NetbufGetByte (Packet
, 0, NULL
);
825 OptionLen
= (Head
->HeadLen
<< 2) - IP4_MIN_HEADLEN
;
827 Option
= (UINT8
*) (Head
+ 1);
831 // Validate packet format and reassemble packet if it is necessary.
833 Status
= Ip4PreProcessPacket (
842 if (EFI_ERROR (Status
)) {
847 // After trim off, the packet is a esp/ah/udp/tcp/icmp6 net buffer,
848 // and no need consider any other ahead ext headers.
850 Status
= Ip4IpSecProcessPacket (
860 if (EFI_ERROR (Status
)) {
865 // If the packet is protected by tunnel mode, parse the inner Ip Packet.
867 ZeroMem (&ZeroHead
, sizeof (IP4_HEAD
));
868 if (0 == CompareMem (Head
, &ZeroHead
, sizeof (IP4_HEAD
))) {
869 // Packet may have been changed. Head, HeadLen, TotalLen, and
870 // info must be reloaded bofore use. The ownership of the packet
871 // is transfered to the packet process logic.
873 Head
= (IP4_HEAD
*) NetbufGetByte (Packet
, 0, NULL
);
874 Status
= Ip4PreProcessPacket (
882 if (EFI_ERROR (Status
)) {
886 Head
= Packet
->Ip
.Ip4
;
887 IP4_GET_CLIP_INFO (Packet
)->Status
= EFI_SUCCESS
;
889 switch (Head
->Protocol
) {
890 case EFI_IP_PROTO_ICMP
:
891 Ip4IcmpHandle (IpSb
, Head
, Packet
);
895 Ip4IgmpHandle (IpSb
, Head
, Packet
);
899 Ip4Demultiplex (IpSb
, Head
, Packet
);
905 // Dispatch the DPCs queued by the NotifyFunction of the rx token's events
906 // which are signaled with received data.
911 Ip4ReceiveFrame (IpSb
->DefaultInterface
, NULL
, Ip4AccpetFrame
, IpSb
);
914 if (Packet
!= NULL
) {
923 Check whether this IP child accepts the packet.
925 @param[in] IpInstance The IP child to check
926 @param[in] Head The IP header of the packet
927 @param[in] Packet The data of the packet
929 @retval TRUE If the child wants to receive the packet.
930 @retval FALSE Otherwise.
934 Ip4InstanceFrameAcceptable (
935 IN IP4_PROTOCOL
*IpInstance
,
940 IP4_ICMP_ERROR_HEAD Icmp
;
941 EFI_IP4_CONFIG_DATA
*Config
;
946 Config
= &IpInstance
->ConfigData
;
949 // Dirty trick for the Tiano UEFI network stack implmentation. If
950 // ReceiveTimeout == -1, the receive of the packet for this instance
951 // is disabled. The UEFI spec don't have such capability. We add
952 // this to improve the performance because IP will make a copy of
953 // the received packet for each accepting instance. Some IP instances
954 // used by UDP/TCP only send packets, they don't wants to receive.
956 if (Config
->ReceiveTimeout
== (UINT32
)(-1)) {
960 if (Config
->AcceptPromiscuous
) {
965 // Use protocol from the IP header embedded in the ICMP error
966 // message to filter, instead of ICMP itself. ICMP handle will
967 // call Ip4Demultiplex to deliver ICMP errors.
969 Proto
= Head
->Protocol
;
971 if ((Proto
== EFI_IP_PROTO_ICMP
) && (!Config
->AcceptAnyProtocol
) && (Proto
!= Config
->DefaultProtocol
)) {
972 NetbufCopy (Packet
, 0, sizeof (Icmp
.Head
), (UINT8
*) &Icmp
.Head
);
974 if (mIcmpClass
[Icmp
.Head
.Type
].IcmpClass
== ICMP_ERROR_MESSAGE
) {
975 if (!Config
->AcceptIcmpErrors
) {
979 NetbufCopy (Packet
, 0, sizeof (Icmp
), (UINT8
*) &Icmp
);
980 Proto
= Icmp
.IpHead
.Protocol
;
985 // Match the protocol
987 if (!Config
->AcceptAnyProtocol
&& (Proto
!= Config
->DefaultProtocol
)) {
992 // Check for broadcast, the caller has computed the packet's
993 // cast type for this child's interface.
995 Info
= IP4_GET_CLIP_INFO (Packet
);
997 if (IP4_IS_BROADCAST (Info
->CastType
)) {
998 return Config
->AcceptBroadcast
;
1002 // If it is a multicast packet, check whether we are in the group.
1004 if (Info
->CastType
== IP4_MULTICAST
) {
1006 // Receive the multicast if the instance wants to receive all packets.
1008 if (!IpInstance
->ConfigData
.UseDefaultAddress
&& (IpInstance
->Interface
->Ip
== 0)) {
1012 for (Index
= 0; Index
< IpInstance
->GroupCount
; Index
++) {
1013 if (IpInstance
->Groups
[Index
] == HTONL (Head
->Dst
)) {
1018 return (BOOLEAN
)(Index
< IpInstance
->GroupCount
);
1026 Enqueue a shared copy of the packet to the IP4 child if the
1027 packet is acceptable to it. Here the data of the packet is
1028 shared, but the net buffer isn't.
1030 @param[in] IpInstance The IP4 child to enqueue the packet to
1031 @param[in] Head The IP header of the received packet
1032 @param[in] Packet The data of the received packet
1034 @retval EFI_NOT_STARTED The IP child hasn't been configured.
1035 @retval EFI_INVALID_PARAMETER The child doesn't want to receive the packet
1036 @retval EFI_OUT_OF_RESOURCES Failed to allocate some resource
1037 @retval EFI_SUCCESS A shared copy the packet is enqueued to the child.
1041 Ip4InstanceEnquePacket (
1042 IN IP4_PROTOCOL
*IpInstance
,
1047 IP4_CLIP_INFO
*Info
;
1051 // Check whether the packet is acceptable to this instance.
1053 if (IpInstance
->State
!= IP4_STATE_CONFIGED
) {
1054 return EFI_NOT_STARTED
;
1057 if (!Ip4InstanceFrameAcceptable (IpInstance
, Head
, Packet
)) {
1058 return EFI_INVALID_PARAMETER
;
1062 // Enque a shared copy of the packet.
1064 Clone
= NetbufClone (Packet
);
1066 if (Clone
== NULL
) {
1067 return EFI_OUT_OF_RESOURCES
;
1071 // Set the receive time out for the assembled packet. If it expires,
1072 // packet will be removed from the queue.
1074 Info
= IP4_GET_CLIP_INFO (Clone
);
1075 Info
->Life
= IP4_US_TO_SEC (IpInstance
->ConfigData
.ReceiveTimeout
);
1077 InsertTailList (&IpInstance
->Received
, &Clone
->List
);
1083 The signal handle of IP4's recycle event. It is called back
1084 when the upper layer release the packet.
1086 @param Event The IP4's recycle event.
1087 @param Context The context of the handle, which is a
1093 Ip4OnRecyclePacket (
1098 IP4_RXDATA_WRAP
*Wrap
;
1100 Wrap
= (IP4_RXDATA_WRAP
*) Context
;
1102 EfiAcquireLockOrFail (&Wrap
->IpInstance
->RecycleLock
);
1103 RemoveEntryList (&Wrap
->Link
);
1104 EfiReleaseLock (&Wrap
->IpInstance
->RecycleLock
);
1106 ASSERT (!NET_BUF_SHARED (Wrap
->Packet
));
1107 NetbufFree (Wrap
->Packet
);
1109 gBS
->CloseEvent (Wrap
->RxData
.RecycleSignal
);
1115 Wrap the received packet to a IP4_RXDATA_WRAP, which will be
1116 delivered to the upper layer. Each IP4 child that accepts the
1117 packet will get a not-shared copy of the packet which is wrapped
1118 in the IP4_RXDATA_WRAP. The IP4_RXDATA_WRAP->RxData is passed
1119 to the upper layer. Upper layer will signal the recycle event in
1120 it when it is done with the packet.
1122 @param[in] IpInstance The IP4 child to receive the packet
1123 @param[in] Packet The packet to deliver up.
1125 @retval Wrap if warp the packet succeed.
1126 @retval NULL failed to wrap the packet .
1131 IN IP4_PROTOCOL
*IpInstance
,
1135 IP4_RXDATA_WRAP
*Wrap
;
1136 EFI_IP4_RECEIVE_DATA
*RxData
;
1139 Wrap
= AllocatePool (IP4_RXDATA_WRAP_SIZE (Packet
->BlockOpNum
));
1145 InitializeListHead (&Wrap
->Link
);
1147 Wrap
->IpInstance
= IpInstance
;
1148 Wrap
->Packet
= Packet
;
1149 RxData
= &Wrap
->RxData
;
1151 ZeroMem (&RxData
->TimeStamp
, sizeof (EFI_TIME
));
1153 Status
= gBS
->CreateEvent (
1158 &RxData
->RecycleSignal
1161 if (EFI_ERROR (Status
)) {
1166 ASSERT (Packet
->Ip
.Ip4
!= NULL
);
1169 // The application expects a network byte order header.
1171 RxData
->HeaderLength
= (Packet
->Ip
.Ip4
->HeadLen
<< 2);
1172 RxData
->Header
= (EFI_IP4_HEADER
*) Ip4NtohHead (Packet
->Ip
.Ip4
);
1174 RxData
->OptionsLength
= RxData
->HeaderLength
- IP4_MIN_HEADLEN
;
1175 RxData
->Options
= NULL
;
1177 if (RxData
->OptionsLength
!= 0) {
1178 RxData
->Options
= (VOID
*) (RxData
->Header
+ 1);
1181 RxData
->DataLength
= Packet
->TotalSize
;
1184 // Build the fragment table to be delivered up.
1186 RxData
->FragmentCount
= Packet
->BlockOpNum
;
1187 NetbufBuildExt (Packet
, (NET_FRAGMENT
*) RxData
->FragmentTable
, &RxData
->FragmentCount
);
1194 Deliver the received packets to upper layer if there are both received
1195 requests and enqueued packets. If the enqueued packet is shared, it will
1196 duplicate it to a non-shared packet, release the shared packet, then
1197 deliver the non-shared packet up.
1199 @param[in] IpInstance The IP child to deliver the packet up.
1201 @retval EFI_OUT_OF_RESOURCES Failed to allocate resources to deliver the
1203 @retval EFI_SUCCESS All the enqueued packets that can be delivered
1208 Ip4InstanceDeliverPacket (
1209 IN IP4_PROTOCOL
*IpInstance
1212 EFI_IP4_COMPLETION_TOKEN
*Token
;
1213 IP4_RXDATA_WRAP
*Wrap
;
1219 // Deliver a packet if there are both a packet and a receive token.
1221 while (!IsListEmpty (&IpInstance
->Received
) &&
1222 !NetMapIsEmpty (&IpInstance
->RxTokens
)) {
1224 Packet
= NET_LIST_HEAD (&IpInstance
->Received
, NET_BUF
, List
);
1226 if (!NET_BUF_SHARED (Packet
)) {
1228 // If this is the only instance that wants the packet, wrap it up.
1230 Wrap
= Ip4WrapRxData (IpInstance
, Packet
);
1233 return EFI_OUT_OF_RESOURCES
;
1236 RemoveEntryList (&Packet
->List
);
1240 // Create a duplicated packet if this packet is shared
1242 Dup
= NetbufDuplicate (Packet
, NULL
, IP4_MAX_HEADLEN
);
1245 return EFI_OUT_OF_RESOURCES
;
1249 // Copy the IP head over. The packet to deliver up is
1250 // headless. Trim the head off after copy. The IP head
1251 // may be not continuous before the data.
1253 Head
= NetbufAllocSpace (Dup
, IP4_MAX_HEADLEN
, NET_BUF_HEAD
);
1254 Dup
->Ip
.Ip4
= (IP4_HEAD
*) Head
;
1256 CopyMem (Head
, Packet
->Ip
.Ip4
, Packet
->Ip
.Ip4
->HeadLen
<< 2);
1257 NetbufTrim (Dup
, IP4_MAX_HEADLEN
, TRUE
);
1259 Wrap
= Ip4WrapRxData (IpInstance
, Dup
);
1263 return EFI_OUT_OF_RESOURCES
;
1266 RemoveEntryList (&Packet
->List
);
1267 NetbufFree (Packet
);
1273 // Insert it into the delivered packet, then get a user's
1274 // receive token, pass the wrapped packet up.
1276 EfiAcquireLockOrFail (&IpInstance
->RecycleLock
);
1277 InsertHeadList (&IpInstance
->Delivered
, &Wrap
->Link
);
1278 EfiReleaseLock (&IpInstance
->RecycleLock
);
1280 Token
= NetMapRemoveHead (&IpInstance
->RxTokens
, NULL
);
1281 Token
->Status
= IP4_GET_CLIP_INFO (Packet
)->Status
;
1282 Token
->Packet
.RxData
= &Wrap
->RxData
;
1284 gBS
->SignalEvent (Token
->Event
);
1292 Enqueue a received packet to all the IP children that share
1295 @param[in] IpSb The IP4 service instance that receive the packet
1296 @param[in] Head The header of the received packet
1297 @param[in] Packet The data of the received packet
1298 @param[in] IpIf The interface to enqueue the packet to
1300 @return The number of the IP4 children that accepts the packet
1304 Ip4InterfaceEnquePacket (
1305 IN IP4_SERVICE
*IpSb
,
1308 IN IP4_INTERFACE
*IpIf
1311 IP4_PROTOCOL
*IpInstance
;
1312 IP4_CLIP_INFO
*Info
;
1319 // First, check that the packet is acceptable to this interface
1320 // and find the local cast type for the interface. A packet sent
1321 // to say 192.168.1.1 should NOT be delliever to 10.0.0.1 unless
1322 // promiscuous receiving.
1325 Info
= IP4_GET_CLIP_INFO (Packet
);
1327 if ((Info
->CastType
== IP4_MULTICAST
) || (Info
->CastType
== IP4_LOCAL_BROADCAST
)) {
1329 // If the CastType is multicast, don't need to filter against
1330 // the group address here, Ip4InstanceFrameAcceptable will do
1333 LocalType
= Info
->CastType
;
1337 // Check the destination againist local IP. If the station
1338 // address is 0.0.0.0, it means receiving all the IP destined
1339 // to local non-zero IP. Otherwise, it is necessary to compare
1340 // the destination to the interface's IP address.
1342 if (IpIf
->Ip
== IP4_ALLZERO_ADDRESS
) {
1343 LocalType
= IP4_LOCAL_HOST
;
1346 LocalType
= Ip4GetNetCast (Head
->Dst
, IpIf
);
1348 if ((LocalType
== 0) && IpIf
->PromiscRecv
) {
1349 LocalType
= IP4_PROMISCUOUS
;
1354 if (LocalType
== 0) {
1359 // Iterate through the ip instances on the interface, enqueue
1360 // the packet if filter passed. Save the original cast type,
1361 // and pass the local cast type to the IP children on the
1362 // interface. The global cast type will be restored later.
1364 SavedType
= Info
->CastType
;
1365 Info
->CastType
= LocalType
;
1369 NET_LIST_FOR_EACH (Entry
, &IpIf
->IpInstances
) {
1370 IpInstance
= NET_LIST_USER_STRUCT (Entry
, IP4_PROTOCOL
, AddrLink
);
1371 NET_CHECK_SIGNATURE (IpInstance
, IP4_PROTOCOL_SIGNATURE
);
1373 if (Ip4InstanceEnquePacket (IpInstance
, Head
, Packet
) == EFI_SUCCESS
) {
1378 Info
->CastType
= SavedType
;
1384 Deliver the packet for each IP4 child on the interface.
1386 @param[in] IpSb The IP4 service instance that received the packet
1387 @param[in] IpIf The IP4 interface to deliver the packet.
1389 @retval EFI_SUCCESS It always returns EFI_SUCCESS now
1393 Ip4InterfaceDeliverPacket (
1394 IN IP4_SERVICE
*IpSb
,
1395 IN IP4_INTERFACE
*IpIf
1398 IP4_PROTOCOL
*Ip4Instance
;
1401 NET_LIST_FOR_EACH (Entry
, &IpIf
->IpInstances
) {
1402 Ip4Instance
= NET_LIST_USER_STRUCT (Entry
, IP4_PROTOCOL
, AddrLink
);
1403 Ip4InstanceDeliverPacket (Ip4Instance
);
1411 Demultiple the packet. the packet delivery is processed in two
1412 passes. The first pass will enque a shared copy of the packet
1413 to each IP4 child that accepts the packet. The second pass will
1414 deliver a non-shared copy of the packet to each IP4 child that
1415 has pending receive requests. Data is copied if more than one
1416 child wants to consume the packet because each IP child needs
1417 its own copy of the packet to make changes.
1419 @param[in] IpSb The IP4 service instance that received the packet
1420 @param[in] Head The header of the received packet
1421 @param[in] Packet The data of the received packet
1423 @retval EFI_NOT_FOUND No IP child accepts the packet
1424 @retval EFI_SUCCESS The packet is enqueued or delivered to some IP
1430 IN IP4_SERVICE
*IpSb
,
1436 IP4_INTERFACE
*IpIf
;
1440 // Two pass delivery: first, enque a shared copy of the packet
1441 // to each instance that accept the packet.
1445 NET_LIST_FOR_EACH (Entry
, &IpSb
->Interfaces
) {
1446 IpIf
= NET_LIST_USER_STRUCT (Entry
, IP4_INTERFACE
, Link
);
1448 if (IpIf
->Configured
) {
1449 Enqueued
+= Ip4InterfaceEnquePacket (IpSb
, Head
, Packet
, IpIf
);
1454 // Second: deliver a duplicate of the packet to each instance.
1455 // Release the local reference first, so that the last instance
1456 // getting the packet will not copy the data.
1458 NetbufFree (Packet
);
1460 if (Enqueued
== 0) {
1461 return EFI_NOT_FOUND
;
1464 NET_LIST_FOR_EACH (Entry
, &IpSb
->Interfaces
) {
1465 IpIf
= NET_LIST_USER_STRUCT (Entry
, IP4_INTERFACE
, Link
);
1467 if (IpIf
->Configured
) {
1468 Ip4InterfaceDeliverPacket (IpSb
, IpIf
);
1477 Timeout the fragment and enqueued packets.
1479 @param[in] IpSb The IP4 service instance to timeout
1483 Ip4PacketTimerTicking (
1484 IN IP4_SERVICE
*IpSb
1487 LIST_ENTRY
*InstanceEntry
;
1490 IP4_PROTOCOL
*IpInstance
;
1491 IP4_ASSEMBLE_ENTRY
*Assemble
;
1493 IP4_CLIP_INFO
*Info
;
1497 // First, time out the fragments. The packet's life is counting down
1498 // once the first-arrived fragment was received.
1500 for (Index
= 0; Index
< IP4_ASSEMLE_HASH_SIZE
; Index
++) {
1501 NET_LIST_FOR_EACH_SAFE (Entry
, Next
, &IpSb
->Assemble
.Bucket
[Index
]) {
1502 Assemble
= NET_LIST_USER_STRUCT (Entry
, IP4_ASSEMBLE_ENTRY
, Link
);
1504 if ((Assemble
->Life
> 0) && (--Assemble
->Life
== 0)) {
1505 RemoveEntryList (Entry
);
1506 Ip4FreeAssembleEntry (Assemble
);
1511 NET_LIST_FOR_EACH (InstanceEntry
, &IpSb
->Children
) {
1512 IpInstance
= NET_LIST_USER_STRUCT (InstanceEntry
, IP4_PROTOCOL
, Link
);
1515 // Second, time out the assembled packets enqueued on each IP child.
1517 NET_LIST_FOR_EACH_SAFE (Entry
, Next
, &IpInstance
->Received
) {
1518 Packet
= NET_LIST_USER_STRUCT (Entry
, NET_BUF
, List
);
1519 Info
= IP4_GET_CLIP_INFO (Packet
);
1521 if ((Info
->Life
> 0) && (--Info
->Life
== 0)) {
1522 RemoveEntryList (Entry
);
1523 NetbufFree (Packet
);
1528 // Third: time out the transmitted packets.
1530 NetMapIterate (&IpInstance
->TxTokens
, Ip4SentPacketTicking
, NULL
);