1 /** @file
2 IP6 option support functions and routines.
3
4 Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
5
6 This program and the accompanying materials
7 are licensed and made available under the terms and conditions of the BSD License
8 which accompanies this distribution. The full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php.
10
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13
14 **/
15
16 #include "Ip6Impl.h"
17
18 /**
19 Validate the IP6 option format for both the packets we received
20 and that we will transmit. It will compute the ICMPv6 error message fields
21 if the option is malformatted.
22
23 @param[in] IpSb The IP6 service data.
24 @param[in] Packet The to be validated packet.
25 @param[in] Option The first byte of the option.
26 @param[in] OptionLen The length of the whole option.
27 @param[in] Pointer Identifies the octet offset within
28 the invoking packet where the error was detected.
29
30
31 @retval TRUE The option is properly formatted.
32 @retval FALSE The option is malformatted.
33
34 **/
35 BOOLEAN
Ip6IsOptionValid(IN IP6_SERVICE * IpSb,IN NET_BUF * Packet,IN UINT8 * Option,IN UINT8 OptionLen,IN UINT32 Pointer)36 Ip6IsOptionValid (
37 IN IP6_SERVICE *IpSb,
38 IN NET_BUF *Packet,
39 IN UINT8 *Option,
40 IN UINT8 OptionLen,
41 IN UINT32 Pointer
42 )
43 {
44 UINT8 Offset;
45 UINT8 OptionType;
46
47 Offset = 0;
48
49 while (Offset < OptionLen) {
50 OptionType = *(Option + Offset);
51
52 switch (OptionType) {
53 case Ip6OptionPad1:
54 //
55 // It is a Pad1 option
56 //
57 Offset++;
58 break;
59 case Ip6OptionPadN:
60 //
61 // It is a PadN option
62 //
63 Offset = (UINT8) (Offset + *(Option + Offset + 1) + 2);
64 break;
65 case Ip6OptionRouterAlert:
66 //
67 // It is a Router Alert Option
68 //
69 Offset += 4;
70 break;
71 default:
72 //
73 // The highest-order two bits specify the action must be taken if
74 // the processing IPv6 node does not recognize the option type.
75 //
76 switch (OptionType & Ip6OptionMask) {
77 case Ip6OptionSkip:
78 Offset = (UINT8) (Offset + *(Option + Offset + 1));
79 break;
80 case Ip6OptionDiscard:
81 return FALSE;
82 case Ip6OptionParameterProblem:
83 Pointer = Pointer + Offset + sizeof (EFI_IP6_HEADER);
84 Ip6SendIcmpError (
85 IpSb,
86 Packet,
87 NULL,
88 &Packet->Ip.Ip6->SourceAddress,
89 ICMP_V6_PARAMETER_PROBLEM,
90 2,
91 &Pointer
92 );
93 return FALSE;
94 case Ip6OptionMask:
95 if (!IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {
96 Pointer = Pointer + Offset + sizeof (EFI_IP6_HEADER);
97 Ip6SendIcmpError (
98 IpSb,
99 Packet,
100 NULL,
101 &Packet->Ip.Ip6->SourceAddress,
102 ICMP_V6_PARAMETER_PROBLEM,
103 2,
104 &Pointer
105 );
106 }
107
108 return FALSE;
109 break;
110 }
111
112 break;
113 }
114
115 }
116
117 return TRUE;
118 }
119
120 /**
121 Validate the IP6 option format for both the packets we received
122 and that we will transmit. It supports the defined options in Neighbor
123 Discovery messages.
124
125 @param[in] Option The first byte of the option.
126 @param[in] OptionLen The length of the whole option.
127
128 @retval TRUE The option is properly formatted.
129 @retval FALSE The option is malformatted.
130
131 **/
132 BOOLEAN
Ip6IsNDOptionValid(IN UINT8 * Option,IN UINT16 OptionLen)133 Ip6IsNDOptionValid (
134 IN UINT8 *Option,
135 IN UINT16 OptionLen
136 )
137 {
138 UINT16 Offset;
139 UINT8 OptionType;
140 UINT16 Length;
141
142 Offset = 0;
143
144 while (Offset < OptionLen) {
145 OptionType = *(Option + Offset);
146 Length = (UINT16) (*(Option + Offset + 1) * 8);
147
148 switch (OptionType) {
149 case Ip6OptionPrefixInfo:
150 if (Length != 32) {
151 return FALSE;
152 }
153
154 break;
155
156 case Ip6OptionMtu:
157 if (Length != 8) {
158 return FALSE;
159 }
160
161 break;
162
163 default:
164 //
165 // Check the length of Ip6OptionEtherSource, Ip6OptionEtherTarget, and
166 // Ip6OptionRedirected here. For unrecognized options, silently ignore
167 // and continue processsing the message.
168 //
169 if (Length == 0) {
170 return FALSE;
171 }
172
173 break;
174 }
175
176 Offset = (UINT16) (Offset + Length);
177 }
178
179 return TRUE;
180 }
181
182
183 /**
184 Validate whether the NextHeader is a known valid protocol or one of the user configured
185 protocols from the upper layer.
186
187 @param[in] IpSb The IP6 service instance.
188 @param[in] NextHeader The next header field.
189
190 @retval TRUE The NextHeader is a known valid protocol or user configured.
191 @retval FALSE The NextHeader is not a known valid protocol.
192
193 **/
194 BOOLEAN
Ip6IsValidProtocol(IN IP6_SERVICE * IpSb,IN UINT8 NextHeader)195 Ip6IsValidProtocol (
196 IN IP6_SERVICE *IpSb,
197 IN UINT8 NextHeader
198 )
199 {
200 LIST_ENTRY *Entry;
201 IP6_PROTOCOL *IpInstance;
202
203 if (NextHeader == EFI_IP_PROTO_TCP ||
204 NextHeader == EFI_IP_PROTO_UDP ||
205 NextHeader == IP6_ICMP ||
206 NextHeader == IP6_ESP
207 ) {
208 return TRUE;
209 }
210
211 if (IpSb == NULL) {
212 return FALSE;
213 }
214
215 if (IpSb->Signature != IP6_SERVICE_SIGNATURE) {
216 return FALSE;
217 }
218
219 NET_LIST_FOR_EACH (Entry, &IpSb->Children) {
220 IpInstance = NET_LIST_USER_STRUCT_S (Entry, IP6_PROTOCOL, Link, IP6_PROTOCOL_SIGNATURE);
221 if (IpInstance->State == IP6_STATE_CONFIGED) {
222 if (IpInstance->ConfigData.DefaultProtocol == NextHeader) {
223 return TRUE;
224 }
225 }
226 }
227
228 return FALSE;
229 }
230
231 /**
232 Validate the IP6 extension header format for both the packets we received
233 and that we will transmit. It will compute the ICMPv6 error message fields
234 if the option is mal-formatted.
235
236 @param[in] IpSb The IP6 service instance. This is an optional parameter.
237 @param[in] Packet The data of the packet. Ignored if NULL.
238 @param[in] NextHeader The next header field in IPv6 basic header.
239 @param[in] ExtHdrs The first byte of the option.
240 @param[in] ExtHdrsLen The length of the whole option.
241 @param[in] Rcvd The option is from the packet we received if TRUE,
242 otherwise, the option we want to transmit.
243 @param[out] FormerHeader The offset of NextHeader which points to Fragment
244 Header when we received, of the ExtHdrs.
245 Ignored if we transmit.
246 @param[out] LastHeader The pointer of NextHeader of the last extension
247 header processed by IP6.
248 @param[out] RealExtsLen The length of extension headers processed by IP6 layer.
249 This is an optional parameter that may be NULL.
250 @param[out] UnFragmentLen The length of unfragmented length of extension headers.
251 This is an optional parameter that may be NULL.
252 @param[out] Fragmented Indicate whether the packet is fragmented.
253 This is an optional parameter that may be NULL.
254
255 @retval TRUE The option is properly formatted.
256 @retval FALSE The option is malformatted.
257
258 **/
259 BOOLEAN
Ip6IsExtsValid(IN IP6_SERVICE * IpSb OPTIONAL,IN NET_BUF * Packet OPTIONAL,IN UINT8 * NextHeader,IN UINT8 * ExtHdrs,IN UINT32 ExtHdrsLen,IN BOOLEAN Rcvd,OUT UINT32 * FormerHeader OPTIONAL,OUT UINT8 ** LastHeader,OUT UINT32 * RealExtsLen OPTIONAL,OUT UINT32 * UnFragmentLen OPTIONAL,OUT BOOLEAN * Fragmented OPTIONAL)260 Ip6IsExtsValid (
261 IN IP6_SERVICE *IpSb OPTIONAL,
262 IN NET_BUF *Packet OPTIONAL,
263 IN UINT8 *NextHeader,
264 IN UINT8 *ExtHdrs,
265 IN UINT32 ExtHdrsLen,
266 IN BOOLEAN Rcvd,
267 OUT UINT32 *FormerHeader OPTIONAL,
268 OUT UINT8 **LastHeader,
269 OUT UINT32 *RealExtsLen OPTIONAL,
270 OUT UINT32 *UnFragmentLen OPTIONAL,
271 OUT BOOLEAN *Fragmented OPTIONAL
272 )
273 {
274 UINT32 Pointer;
275 UINT32 Offset;
276 UINT8 *Option;
277 UINT8 OptionLen;
278 BOOLEAN Flag;
279 UINT8 CountD;
280 UINT8 CountA;
281 IP6_FRAGMENT_HEADER *FragmentHead;
282 UINT16 FragmentOffset;
283 IP6_ROUTING_HEADER *RoutingHead;
284
285 if (RealExtsLen != NULL) {
286 *RealExtsLen = 0;
287 }
288
289 if (UnFragmentLen != NULL) {
290 *UnFragmentLen = 0;
291 }
292
293 if (Fragmented != NULL) {
294 *Fragmented = FALSE;
295 }
296
297 *LastHeader = NextHeader;
298
299 if (ExtHdrs == NULL && ExtHdrsLen == 0) {
300 return TRUE;
301 }
302
303 if ((ExtHdrs == NULL && ExtHdrsLen != 0) || (ExtHdrs != NULL && ExtHdrsLen == 0)) {
304 return FALSE;
305 }
306
307 Pointer = 0;
308 Offset = 0;
309 Flag = FALSE;
310 CountD = 0;
311 CountA = 0;
312
313 while (Offset <= ExtHdrsLen) {
314
315 switch (*NextHeader) {
316 case IP6_HOP_BY_HOP:
317 if (Offset != 0) {
318 if (!Rcvd) {
319 return FALSE;
320 }
321 //
322 // Hop-by-Hop Options header is restricted to appear immediately after an IPv6 header only.
323 // If not, generate a ICMP parameter problem message with code value of 1.
324 //
325 if (Pointer == 0) {
326 Pointer = sizeof (EFI_IP6_HEADER);
327 } else {
328 Pointer = Offset + sizeof (EFI_IP6_HEADER);
329 }
330
331 if ((IpSb != NULL) && (Packet != NULL) &&
332 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {
333 Ip6SendIcmpError (
334 IpSb,
335 Packet,
336 NULL,
337 &Packet->Ip.Ip6->SourceAddress,
338 ICMP_V6_PARAMETER_PROBLEM,
339 1,
340 &Pointer
341 );
342 }
343 return FALSE;
344 }
345
346 Flag = TRUE;
347
348 //
349 // Fall through
350 //
351 case IP6_DESTINATION:
352 if (*NextHeader == IP6_DESTINATION) {
353 CountD++;
354 }
355
356 if (CountD > 2) {
357 return FALSE;
358 }
359
360 NextHeader = ExtHdrs + Offset;
361 Pointer = Offset;
362
363 Offset++;
364 Option = ExtHdrs + Offset;
365 OptionLen = (UINT8) ((*Option + 1) * 8 - 2);
366 Option++;
367 Offset++;
368
369 if (IpSb != NULL && Packet != NULL && !Ip6IsOptionValid (IpSb, Packet, Option, OptionLen, Offset)) {
370 return FALSE;
371 }
372
373 Offset = Offset + OptionLen;
374
375 if (Flag) {
376 if (UnFragmentLen != NULL) {
377 *UnFragmentLen = Offset;
378 }
379
380 Flag = FALSE;
381 }
382
383 break;
384
385 case IP6_ROUTING:
386 NextHeader = ExtHdrs + Offset;
387 RoutingHead = (IP6_ROUTING_HEADER *) NextHeader;
388
389 //
390 // Type 0 routing header is defined in RFC2460 and deprecated in RFC5095.
391 // Thus all routing types are processed as unrecognized.
392 //
393 if (RoutingHead->SegmentsLeft == 0) {
394 //
395 // Ignore the routing header and proceed to process the next header.
396 //
397 Offset = Offset + (RoutingHead->HeaderLen + 1) * 8;
398
399 if (UnFragmentLen != NULL) {
400 *UnFragmentLen = Offset;
401 }
402
403 } else {
404 //
405 // Discard the packet and send an ICMP Parameter Problem, Code 0, message
406 // to the packet's source address, pointing to the unrecognized routing
407 // type.
408 //
409 Pointer = Offset + 2 + sizeof (EFI_IP6_HEADER);
410 if ((IpSb != NULL) && (Packet != NULL) &&
411 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {
412 Ip6SendIcmpError (
413 IpSb,
414 Packet,
415 NULL,
416 &Packet->Ip.Ip6->SourceAddress,
417 ICMP_V6_PARAMETER_PROBLEM,
418 0,
419 &Pointer
420 );
421 }
422
423 return FALSE;
424 }
425
426 break;
427
428 case IP6_FRAGMENT:
429
430 //
431 // RFC2402, AH header should after fragment header.
432 //
433 if (CountA > 1) {
434 return FALSE;
435 }
436
437 //
438 // RFC2460, ICMP Parameter Problem message with code 0 should be sent
439 // if the length of a fragment is not a multiple of 8 octets and the M
440 // flag of that fragment is 1, pointing to the Payload length field of the
441 // fragment packet.
442 //
443 if (IpSb != NULL && Packet != NULL && (ExtHdrsLen % 8) != 0) {
444 //
445 // Check whether it is the last fragment.
446 //
447 FragmentHead = (IP6_FRAGMENT_HEADER *) (ExtHdrs + Offset);
448 if (FragmentHead == NULL) {
449 return FALSE;
450 }
451
452 FragmentOffset = NTOHS (FragmentHead->FragmentOffset);
453
454 if (((FragmentOffset & 0x1) == 0x1) &&
455 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {
456 Pointer = sizeof (UINT32);
457 Ip6SendIcmpError (
458 IpSb,
459 Packet,
460 NULL,
461 &Packet->Ip.Ip6->SourceAddress,
462 ICMP_V6_PARAMETER_PROBLEM,
463 0,
464 &Pointer
465 );
466 return FALSE;
467 }
468 }
469
470 if (Fragmented != NULL) {
471 *Fragmented = TRUE;
472 }
473
474 if (Rcvd && FormerHeader != NULL) {
475 *FormerHeader = (UINT32) (NextHeader - ExtHdrs);
476 }
477
478 NextHeader = ExtHdrs + Offset;
479 Offset = Offset + 8;
480 break;
481
482 case IP6_AH:
483 if (++CountA > 1) {
484 return FALSE;
485 }
486
487 Option = ExtHdrs + Offset;
488 NextHeader = Option;
489 Option++;
490 //
491 // RFC2402, Payload length is specified in 32-bit words, minus "2".
492 //
493 OptionLen = (UINT8) ((*Option + 2) * 4);
494 Offset = Offset + OptionLen;
495 break;
496
497 case IP6_NO_NEXT_HEADER:
498 *LastHeader = NextHeader;
499 return FALSE;
500 break;
501
502 default:
503 if (Ip6IsValidProtocol (IpSb, *NextHeader)) {
504
505 *LastHeader = NextHeader;
506
507 if (RealExtsLen != NULL) {
508 *RealExtsLen = Offset;
509 }
510
511 return TRUE;
512 }
513
514 //
515 // The Next Header value is unrecognized by the node, discard the packet and
516 // send an ICMP parameter problem message with code value of 1.
517 //
518 if (Offset == 0) {
519 //
520 // The Next Header directly follows IPv6 basic header.
521 //
522 Pointer = 6;
523 } else {
524 if (Pointer == 0) {
525 Pointer = sizeof (EFI_IP6_HEADER);
526 } else {
527 Pointer = Offset + sizeof (EFI_IP6_HEADER);
528 }
529 }
530
531 if ((IpSb != NULL) && (Packet != NULL) &&
532 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {
533 Ip6SendIcmpError (
534 IpSb,
535 Packet,
536 NULL,
537 &Packet->Ip.Ip6->SourceAddress,
538 ICMP_V6_PARAMETER_PROBLEM,
539 1,
540 &Pointer
541 );
542 }
543 return FALSE;
544 }
545 }
546
547 *LastHeader = NextHeader;
548
549 if (RealExtsLen != NULL) {
550 *RealExtsLen = Offset;
551 }
552
553 return TRUE;
554 }
555
556 /**
557 Generate an IPv6 router alert option in network order and output it through Buffer.
558
559 @param[out] Buffer Points to a buffer to record the generated option.
560 @param[in, out] BufferLen The length of Buffer, in bytes.
561 @param[in] NextHeader The 8-bit selector indicates the type of header
562 immediately following the Hop-by-Hop Options header.
563
564 @retval EFI_BUFFER_TOO_SMALL The Buffer is too small to contain the generated
565 option. BufferLen is updated for the required size.
566
567 @retval EFI_SUCCESS The option is generated and filled in to Buffer.
568
569 **/
570 EFI_STATUS
Ip6FillHopByHop(OUT UINT8 * Buffer,IN OUT UINTN * BufferLen,IN UINT8 NextHeader)571 Ip6FillHopByHop (
572 OUT UINT8 *Buffer,
573 IN OUT UINTN *BufferLen,
574 IN UINT8 NextHeader
575 )
576 {
577 UINT8 BufferArray[8];
578
579 if (*BufferLen < 8) {
580 *BufferLen = 8;
581 return EFI_BUFFER_TOO_SMALL;
582 }
583
584 //
585 // Form the Hop-By-Hop option in network order.
586 // NextHeader (1 octet) + HdrExtLen (1 octet) + RouterAlertOption(4 octets) + PadN
587 // The Hdr Ext Len is the length in 8-octet units, and does not including the first 8 octets.
588 //
589 ZeroMem (BufferArray, sizeof (BufferArray));
590 BufferArray[0] = NextHeader;
591 BufferArray[2] = 0x5;
592 BufferArray[3] = 0x2;
593 BufferArray[6] = 1;
594
595 CopyMem (Buffer, BufferArray, sizeof (BufferArray));
596 return EFI_SUCCESS;
597 }
598
599 /**
600 Insert a Fragment Header to the Extension headers and output it in UpdatedExtHdrs.
601
602 @param[in] IpSb The IP6 service instance to transmit the packet.
603 @param[in] NextHeader The extension header type of first extension header.
604 @param[in] LastHeader The extension header type of last extension header.
605 @param[in] ExtHdrs The length of the original extension header.
606 @param[in] ExtHdrsLen The length of the extension headers.
607 @param[in] FragmentOffset The fragment offset of the data following the header.
608 @param[out] UpdatedExtHdrs The updated ExtHdrs with Fragment header inserted.
609 It's caller's responsibility to free this buffer.
610
611 @retval EFI_OUT_OF_RESOURCES Failed to finish the operation due to lake of
612 resource.
613 @retval EFI_UNSUPPORTED The extension header specified in ExtHdrs is not
614 supported currently.
615 @retval EFI_SUCCESS The operation performed successfully.
616
617 **/
618 EFI_STATUS
Ip6FillFragmentHeader(IN IP6_SERVICE * IpSb,IN UINT8 NextHeader,IN UINT8 LastHeader,IN UINT8 * ExtHdrs,IN UINT32 ExtHdrsLen,IN UINT16 FragmentOffset,OUT UINT8 ** UpdatedExtHdrs)619 Ip6FillFragmentHeader (
620 IN IP6_SERVICE *IpSb,
621 IN UINT8 NextHeader,
622 IN UINT8 LastHeader,
623 IN UINT8 *ExtHdrs,
624 IN UINT32 ExtHdrsLen,
625 IN UINT16 FragmentOffset,
626 OUT UINT8 **UpdatedExtHdrs
627 )
628 {
629 UINT32 Length;
630 UINT8 *Buffer;
631 UINT32 FormerHeader;
632 UINT32 Offset;
633 UINT32 Part1Len;
634 UINT32 HeaderLen;
635 UINT8 Current;
636 IP6_FRAGMENT_HEADER FragmentHead;
637
638 if (UpdatedExtHdrs == NULL) {
639 return EFI_INVALID_PARAMETER;
640 }
641
642 Length = ExtHdrsLen + sizeof (IP6_FRAGMENT_HEADER);
643 Buffer = AllocatePool (Length);
644 if (Buffer == NULL) {
645 return EFI_OUT_OF_RESOURCES;
646 }
647
648 Offset = 0;
649 Part1Len = 0;
650 FormerHeader = 0;
651 Current = NextHeader;
652
653 while ((ExtHdrs != NULL) && (Offset <= ExtHdrsLen)) {
654 switch (NextHeader) {
655 case IP6_ROUTING:
656 case IP6_HOP_BY_HOP:
657 case IP6_DESTINATION:
658 Current = NextHeader;
659 NextHeader = *(ExtHdrs + Offset);
660
661 if ((Current == IP6_DESTINATION) && (NextHeader != IP6_ROUTING)) {
662 //
663 // Destination Options header should occur at most twice, once before
664 // a Routing header and once before the upper-layer header. Here we
665 // find the one before the upper-layer header. Insert the Fragment
666 // Header before it.
667 //
668 CopyMem (Buffer, ExtHdrs, Part1Len);
669 *(Buffer + FormerHeader) = IP6_FRAGMENT;
670 //
671 // Exit the loop.
672 //
673 Offset = ExtHdrsLen + 1;
674 break;
675 }
676
677
678 FormerHeader = Offset;
679 HeaderLen = (*(ExtHdrs + Offset + 1) + 1) * 8;
680 Part1Len = Part1Len + HeaderLen;
681 Offset = Offset + HeaderLen;
682 break;
683
684 case IP6_FRAGMENT:
685 Current = NextHeader;
686
687 if (Part1Len != 0) {
688 CopyMem (Buffer, ExtHdrs, Part1Len);
689 }
690
691 *(Buffer + FormerHeader) = IP6_FRAGMENT;
692
693 //
694 // Exit the loop.
695 //
696 Offset = ExtHdrsLen + 1;
697 break;
698
699 case IP6_AH:
700 Current = NextHeader;
701 NextHeader = *(ExtHdrs + Offset);
702 //
703 // RFC2402, Payload length is specified in 32-bit words, minus "2".
704 //
705 HeaderLen = (*(ExtHdrs + Offset + 1) + 2) * 4;
706 Part1Len = Part1Len + HeaderLen;
707 Offset = Offset + HeaderLen;
708 break;
709
710 default:
711 if (Ip6IsValidProtocol (IpSb, NextHeader)) {
712 Current = NextHeader;
713 CopyMem (Buffer, ExtHdrs, Part1Len);
714 *(Buffer + FormerHeader) = IP6_FRAGMENT;
715 //
716 // Exit the loop.
717 //
718 Offset = ExtHdrsLen + 1;
719 break;
720 }
721
722 FreePool (Buffer);
723 return EFI_UNSUPPORTED;
724 }
725 }
726
727 //
728 // Append the Fragment header. If the fragment offset indicates the fragment
729 // is the first fragment.
730 //
731 if ((FragmentOffset & IP6_FRAGMENT_OFFSET_MASK) == 0) {
732 FragmentHead.NextHeader = Current;
733 } else {
734 FragmentHead.NextHeader = LastHeader;
735 }
736
737 FragmentHead.Reserved = 0;
738 FragmentHead.FragmentOffset = HTONS (FragmentOffset);
739 FragmentHead.Identification = mIp6Id;
740
741 CopyMem (Buffer + Part1Len, &FragmentHead, sizeof (IP6_FRAGMENT_HEADER));
742
743 if ((ExtHdrs != NULL) && (Part1Len < ExtHdrsLen)) {
744 //
745 // Append the part2 (fragmentable part) of Extension headers
746 //
747 CopyMem (
748 Buffer + Part1Len + sizeof (IP6_FRAGMENT_HEADER),
749 ExtHdrs + Part1Len,
750 ExtHdrsLen - Part1Len
751 );
752 }
753
754 *UpdatedExtHdrs = Buffer;
755
756 return EFI_SUCCESS;
757 }
758
759