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Fix a bug about the iSCSI DHCP dependency issue.
[mirror_edk2.git] / NetworkPkg / Ip6Dxe / Ip6Option.c
CommitLineData
a3bcde70
HT		 1/** @file\r
2 IP6 option support functions and routines.\r
3\r
4 Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>\r
5\r
6 This program and the accompanying materials\r
7 are licensed and made available under the terms and conditions of the BSD License\r
8 which accompanies this distribution. The full text of the license may be found at\r
9 http://opensource.org/licenses/bsd-license.php.\r
10\r
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
13\r
14**/\r
15\r
16#include "Ip6Impl.h"\r
17\r
18/**\r
19 Validate the IP6 option format for both the packets we received\r
20 and that we will transmit. It will compute the ICMPv6 error message fields\r
21 if the option is malformated.\r
22\r
23 @param[in] IpSb The IP6 service data.\r
24 @param[in] Packet The to be validated packet.\r
25 @param[in] Option The first byte of the option.\r
26 @param[in] OptionLen The length of the whole option.\r
27 @param[in] Pointer Identifies the octet offset within\r
28 the invoking packet where the error was detected.\r
29\r
30\r
31 @retval TRUE The option is properly formatted.\r
32 @retval FALSE The option is malformated.\r
33\r
34**/\r
35BOOLEAN\r
36Ip6IsOptionValid (\r
37 IN IP6_SERVICE *IpSb,\r
38 IN NET_BUF *Packet,\r
39 IN UINT8 *Option,\r
40 IN UINT8 OptionLen,\r
41 IN UINT32 Pointer\r
42 )\r
43{\r
44 UINT8 Offset;\r
45 UINT8 OptionType;\r
46\r
47 Offset = 0;\r
48\r
49 while (Offset < OptionLen) {\r
50 OptionType = *(Option + Offset);\r
51\r
52 switch (OptionType) {\r
53 case Ip6OptionPad1:\r
54 //\r
55 // It is a Pad1 option\r
56 //\r
57 Offset++;\r
58 break;\r
59 case Ip6OptionPadN:\r
60 //\r
61 // It is a PadN option\r
62 //\r
63 Offset = (UINT8) (Offset + *(Option + Offset + 1) + 2);\r
64 break;\r
65 case Ip6OptionRouterAlert:\r
66 //\r
67 // It is a Router Alert Option\r
68 //\r
69 Offset += 4;\r
70 break;\r
71 default:\r
72 //\r
73 // The highest-order two bits specify the action must be taken if\r
74 // the processing IPv6 node does not recognize the option type.\r
75 //\r
76 switch (OptionType & Ip6OptionMask) {\r
77 case Ip6OptionSkip:\r
78 Offset = (UINT8) (Offset + *(Option + Offset + 1));\r
79 break;\r
80 case Ip6OptionDiscard:\r
81 return FALSE;\r
82 case Ip6OptionParameterProblem:\r
83 Pointer = Pointer + Offset + sizeof (EFI_IP6_HEADER);\r
84 Ip6SendIcmpError (\r
85 IpSb,\r
86 Packet,\r
87 NULL,\r
88 &Packet->Ip.Ip6->SourceAddress,\r
89 ICMP_V6_PARAMETER_PROBLEM,\r
90 2,\r
91 &Pointer\r
92 );\r
93 return FALSE;\r
94 case Ip6OptionMask:\r
95 if (!IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {\r
96 Pointer = Pointer + Offset + sizeof (EFI_IP6_HEADER);\r
97 Ip6SendIcmpError (\r
98 IpSb,\r
99 Packet,\r
100 NULL,\r
101 &Packet->Ip.Ip6->SourceAddress,\r
102 ICMP_V6_PARAMETER_PROBLEM,\r
103 2,\r
104 &Pointer\r
105 );\r
106 }\r
107\r
108 return FALSE;\r
109 break;\r
110 }\r
111\r
112 break;\r
113 }\r
114\r
115 }\r
116\r
117 return TRUE;\r
118}\r
119\r
120/**\r
121 Validate the IP6 option format for both the packets we received\r
122 and that we will transmit. It supports the defined options in Neighbor\r
123 Discovery messages.\r
124\r
125 @param[in] Option The first byte of the option.\r
126 @param[in] OptionLen The length of the whole option.\r
127\r
128 @retval TRUE The option is properly formatted.\r
129 @retval FALSE The option is malformated.\r
130\r
131**/\r
132BOOLEAN\r
133Ip6IsNDOptionValid (\r
134 IN UINT8 *Option,\r
135 IN UINT16 OptionLen\r
136 )\r
137{\r
138 UINT16 Offset;\r
139 UINT8 OptionType;\r
140 UINT16 Length;\r
141\r
142 Offset = 0;\r
143\r
144 while (Offset < OptionLen) {\r
145 OptionType = *(Option + Offset);\r
146 Length = (UINT16) (*(Option + Offset + 1) * 8);\r
147\r
148 switch (OptionType) {\r
149 case Ip6OptionPrefixInfo:\r
150 if (Length != 32) {\r
151 return FALSE;\r
152 }\r
153\r
154 break;\r
155\r
156 case Ip6OptionMtu:\r
157 if (Length != 8) {\r
158 return FALSE;\r
159 }\r
160\r
161 break;\r
162\r
163 default:\r
164 //\r
165 // Check the length of Ip6OptionEtherSource, Ip6OptionEtherTarget, and\r
166 // Ip6OptionRedirected here. For unrecognized options, silently ignore\r
167 // and continue processsing the message.\r
168 //\r
169 if (Length == 0) {\r
170 return FALSE;\r
171 }\r
172\r
173 break;\r
174 }\r
175\r
176 Offset = (UINT16) (Offset + Length);\r
177 }\r
178\r
179 return TRUE;\r
180}\r
181\r
182\r
183/**\r
184 Validate whether the NextHeader is a known valid protocol or one of the user configured\r
185 protocols from the upper layer.\r
186\r
187 @param[in] IpSb The IP6 service instance.\r
188 @param[in] NextHeader The next header field.\r
189\r
190 @retval TRUE The NextHeader is a known valid protocol or user configured.\r
191 @retval FALSE The NextHeader is not a known valid protocol.\r
192\r
193**/\r
194BOOLEAN\r
195Ip6IsValidProtocol (\r
196 IN IP6_SERVICE *IpSb,\r
197 IN UINT8 NextHeader\r
198 )\r
199{\r
200 LIST_ENTRY *Entry;\r
201 IP6_PROTOCOL *IpInstance;\r
202\r
203 if (NextHeader == EFI_IP_PROTO_TCP ||\r
204 NextHeader == EFI_IP_PROTO_UDP ||\r
205 NextHeader == IP6_ICMP ||\r
206 NextHeader == IP6_ESP\r
207 ) {\r
208 return TRUE;\r
209 }\r
210\r
211 if (IpSb == NULL) {\r
212 return FALSE;\r
213 }\r
214\r
215 if (IpSb->Signature != IP6_SERVICE_SIGNATURE) {\r
216 return FALSE;\r
217 }\r
218\r
219 NET_LIST_FOR_EACH (Entry, &IpSb->Children) {\r
220 IpInstance = NET_LIST_USER_STRUCT_S (Entry, IP6_PROTOCOL, Link, IP6_PROTOCOL_SIGNATURE);\r
221 if (IpInstance->State == IP6_STATE_CONFIGED) {\r
222 if (IpInstance->ConfigData.DefaultProtocol == NextHeader) {\r
223 return TRUE;\r
224 }\r
225 }\r
226 }\r
227\r
228 return FALSE;\r
229}\r
230\r
231/**\r
232 Validate the IP6 extension header format for both the packets we received\r
233 and that we will transmit. It will compute the ICMPv6 error message fields\r
234 if the option is mal-formated.\r
235\r
236 @param[in] IpSb The IP6 service instance. This is an optional parameter.\r
237 @param[in] Packet The data of the packet. Ignored if NULL.\r
238 @param[in] NextHeader The next header field in IPv6 basic header.\r
239 @param[in] ExtHdrs The first byte of the option.\r
240 @param[in] ExtHdrsLen The length of the whole option.\r
241 @param[in] Rcvd The option is from the packet we received if TRUE,\r
242 otherwise, the option we want to transmit.\r
243 @param[out] FormerHeader The offset of NextHeader which points to Fragment\r
244 Header when we received, of the ExtHdrs.\r
245 Ignored if we transmit.\r
246 @param[out] LastHeader The pointer of NextHeader of the last extension\r
247 header processed by IP6.\r
248 @param[out] RealExtsLen The length of extension headers processed by IP6 layer.\r
249 This is an optional parameter that may be NULL.\r
250 @param[out] UnFragmentLen The length of unfragmented length of extension headers.\r
251 This is an optional parameter that may be NULL.\r
252 @param[out] Fragmented Indicate whether the packet is fragmented.\r
253 This is an optional parameter that may be NULL.\r
254\r
255 @retval TRUE The option is properly formated.\r
256 @retval FALSE The option is malformated.\r
257\r
258**/\r
259BOOLEAN\r
260Ip6IsExtsValid (\r
261 IN IP6_SERVICE *IpSb OPTIONAL,\r
262 IN NET_BUF *Packet OPTIONAL,\r
263 IN UINT8 *NextHeader,\r
264 IN UINT8 *ExtHdrs,\r
265 IN UINT32 ExtHdrsLen,\r
266 IN BOOLEAN Rcvd,\r
267 OUT UINT32 *FormerHeader OPTIONAL,\r
268 OUT UINT8 **LastHeader,\r
269 OUT UINT32 *RealExtsLen OPTIONAL,\r
270 OUT UINT32 *UnFragmentLen OPTIONAL,\r
271 OUT BOOLEAN *Fragmented OPTIONAL\r
272 )\r
273{\r
274 UINT32 Pointer;\r
275 UINT32 Offset;\r
276 UINT8 *Option;\r
277 UINT8 OptionLen;\r
278 BOOLEAN Flag;\r
279 UINT8 CountD;\r
280 UINT8 CountA;\r
281 IP6_FRAGMENT_HEADER *FragmentHead;\r
282 UINT16 FragmentOffset;\r
283 IP6_ROUTING_HEADER *RoutingHead;\r
284\r
285 if (RealExtsLen != NULL) {\r
286 *RealExtsLen = 0;\r
287 }\r
288\r
289 if (UnFragmentLen != NULL) {\r
290 *UnFragmentLen = 0;\r
291 }\r
292\r
293 if (Fragmented != NULL) {\r
294 *Fragmented = FALSE;\r
295 }\r
296\r
297 *LastHeader = NextHeader;\r
298\r
299 if (ExtHdrs == NULL && ExtHdrsLen == 0) {\r
300 return TRUE;\r
301 }\r
302\r
303 if ((ExtHdrs == NULL && ExtHdrsLen != 0) || (ExtHdrs != NULL && ExtHdrsLen == 0)) {\r
304 return FALSE;\r
305 }\r
306\r
307 Pointer = 0;\r
308 Offset = 0;\r
309 Flag = FALSE;\r
310 CountD = 0;\r
311 CountA = 0;\r
312\r
313 while (Offset <= ExtHdrsLen) {\r
314\r
315 switch (*NextHeader) {\r
316 case IP6_HOP_BY_HOP:\r
317 if (Offset != 0) {\r
318 if (!Rcvd) {\r
319 return FALSE;\r
320 }\r
321 //\r
322 // Hop-by-Hop Options header is restricted to appear immediately after an IPv6 header only.\r
323 // If not, generate a ICMP parameter problem message with code value of 1.\r
324 //\r
325 if (Pointer == 0) {\r
326 Pointer = sizeof (EFI_IP6_HEADER);\r
327 } else {\r
328 Pointer = Offset + sizeof (EFI_IP6_HEADER);\r
329 }\r
330\r
331 if ((IpSb != NULL) && (Packet != NULL) &&\r
332 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {\r
333 Ip6SendIcmpError (\r
334 IpSb,\r
335 Packet,\r
336 NULL,\r
337 &Packet->Ip.Ip6->SourceAddress,\r
338 ICMP_V6_PARAMETER_PROBLEM,\r
339 1,\r
340 &Pointer\r
341 );\r
342 }\r
343 return FALSE;\r
344 }\r
345\r
346 Flag = TRUE;\r
347\r
348 //\r
349 // Fall through\r
350 //\r
351 case IP6_DESTINATION:\r
352 if (*NextHeader == IP6_DESTINATION) {\r
353 CountD++;\r
354 }\r
355\r
356 if (CountD > 2) {\r
357 return FALSE;\r
358 }\r
359\r
360 NextHeader = ExtHdrs + Offset;\r
361 Pointer = Offset;\r
362\r
363 Offset++;\r
364 Option = ExtHdrs + Offset;\r
365 OptionLen = (UINT8) ((*Option + 1) * 8 - 2);\r
366 Option++;\r
367 Offset++;\r
368\r
369 if (IpSb != NULL && Packet != NULL && !Ip6IsOptionValid (IpSb, Packet, Option, OptionLen, Offset)) {\r
370 return FALSE;\r
371 }\r
372\r
373 Offset = Offset + OptionLen;\r
374\r
375 if (Flag) {\r
376 if (UnFragmentLen != NULL) {\r
377 *UnFragmentLen = Offset;\r
378 }\r
379\r
380 Flag = FALSE;\r
381 }\r
382\r
383 break;\r
384\r
385 case IP6_ROUTING:\r
386 NextHeader = ExtHdrs + Offset;\r
387 RoutingHead = (IP6_ROUTING_HEADER *) NextHeader;\r
388\r
389 //\r
390 // Type 0 routing header is defined in RFC2460 and deprecated in RFC5095.\r
391 // Thus all routing types are processed as unrecognized.\r
392 //\r
393 if (RoutingHead->SegmentsLeft == 0) {\r
394 //\r
395 // Ignore the routing header and proceed to process the next header.\r
396 //\r
397 Offset = Offset + (RoutingHead->HeaderLen + 1) * 8;\r
398\r
399 if (UnFragmentLen != NULL) {\r
400 *UnFragmentLen = Offset;\r
401 }\r
402\r
403 } else {\r
404 //\r
405 // Discard the packet and send an ICMP Parameter Problem, Code 0, message\r
406 // to the packet's source address, pointing to the unrecognized routing\r
407 // type.\r
408 //\r
409 Pointer = Offset + 2 + sizeof (EFI_IP6_HEADER);\r
410 if ((IpSb != NULL) && (Packet != NULL) &&\r
411 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {\r
412 Ip6SendIcmpError (\r
413 IpSb,\r
414 Packet,\r
415 NULL,\r
416 &Packet->Ip.Ip6->SourceAddress,\r
417 ICMP_V6_PARAMETER_PROBLEM,\r
418 0,\r
419 &Pointer\r
420 );\r
421 }\r
422\r
423 return FALSE;\r
424 }\r
425\r
426 break;\r
427\r
428 case IP6_FRAGMENT:\r
429\r
430 //\r
431 // RFC2402, AH header should after fragment header.\r
432 //\r
433 if (CountA > 1) {\r
434 return FALSE;\r
435 }\r
436\r
437 //\r
438 // RFC2460, ICMP Parameter Problem message with code 0 should be sent\r
439 // if the length of a fragment is not a multiple of 8 octects and the M\r
440 // flag of that fragment is 1, pointing to the Payload length field of the\r
441 // fragment packet.\r
442 //\r
443 if (IpSb != NULL && Packet != NULL && (ExtHdrsLen % 8) != 0) {\r
444 //\r
445 // Check whether it is the last fragment.\r
446 //\r
447 FragmentHead = (IP6_FRAGMENT_HEADER *) (ExtHdrs + Offset);\r
448 if (FragmentHead == NULL) {\r
449 return FALSE;\r
450 }\r
451\r
452 FragmentOffset = NTOHS (FragmentHead->FragmentOffset);\r
453\r
454 if (((FragmentOffset & 0x1) == 0x1) &&\r
455 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {\r
456 Pointer = sizeof (UINT32);\r
457 Ip6SendIcmpError (\r
458 IpSb,\r
459 Packet,\r
460 NULL,\r
461 &Packet->Ip.Ip6->SourceAddress,\r
462 ICMP_V6_PARAMETER_PROBLEM,\r
463 0,\r
464 &Pointer\r
465 );\r
466 return FALSE;\r
467 }\r
468 }\r
469\r
470 if (Fragmented != NULL) {\r
471 *Fragmented = TRUE;\r
472 }\r
473\r
474 if (Rcvd && FormerHeader != NULL) {\r
475 *FormerHeader = (UINT32) (NextHeader - ExtHdrs);\r
476 }\r
477\r
478 NextHeader = ExtHdrs + Offset;\r
479 Offset = Offset + 8;\r
480 break;\r
481\r
482 case IP6_AH:\r
483 if (++CountA > 1) {\r
484 return FALSE;\r
485 }\r
486\r
487 Option = ExtHdrs + Offset;\r
488 NextHeader = Option;\r
489 Option++;\r
490 //\r
491 // RFC2402, Payload length is specified in 32-bit words, minus "2".\r
492 //\r
493 OptionLen = (UINT8) ((*Option + 2) * 4);\r
494 Offset = Offset + OptionLen;\r
495 break;\r
496\r
497 case IP6_NO_NEXT_HEADER:\r
498 *LastHeader = NextHeader;\r
499 return FALSE;\r
500 break;\r
501\r
502 default:\r
503 if (Ip6IsValidProtocol (IpSb, *NextHeader)) {\r
504\r
505 *LastHeader = NextHeader;\r
506\r
507 if (RealExtsLen != NULL) {\r
508 *RealExtsLen = Offset;\r
509 }\r
510\r
511 return TRUE;\r
512 }\r
513\r
514 //\r
515 // The Next Header value is unrecognized by the node, discard the packet and\r
516 // send an ICMP parameter problem message with code value of 1.\r
517 //\r
518 if (Offset == 0) {\r
519 //\r
520 // The Next Header directly follows IPv6 basic header.\r
521 //\r
522 Pointer = 6;\r
523 } else {\r
524 if (Pointer == 0) {\r
525 Pointer = sizeof (EFI_IP6_HEADER);\r
526 } else {\r
527 Pointer = Offset + sizeof (EFI_IP6_HEADER);\r
528 }\r
529 }\r
530\r
531 if ((IpSb != NULL) && (Packet != NULL) &&\r
532 !IP6_IS_MULTICAST (&Packet->Ip.Ip6->DestinationAddress)) {\r
533 Ip6SendIcmpError (\r
534 IpSb,\r
535 Packet,\r
536 NULL,\r
537 &Packet->Ip.Ip6->SourceAddress,\r
538 ICMP_V6_PARAMETER_PROBLEM,\r
539 1,\r
540 &Pointer\r
541 );\r
542 }\r
543 return FALSE;\r
544 }\r
545 }\r
546\r
547 *LastHeader = NextHeader;\r
548\r
549 if (RealExtsLen != NULL) {\r
550 *RealExtsLen = Offset;\r
551 }\r
552\r
553 return TRUE;\r
554}\r
555\r
556/**\r
557 Generate an IPv6 router alert option in network order and output it through Buffer.\r
558\r
559 @param[out] Buffer Points to a buffer to record the generated option.\r
560 @param[in, out] BufferLen The length of Buffer, in bytes.\r
561 @param[in] NextHeader The 8-bit selector indicates the type of header\r
562 immediately following the Hop-by-Hop Options header.\r
563\r
564 @retval EFI_BUFFER_TOO_SMALL The Buffer is too small to contain the generated\r
565 option. BufferLen is updated for the required size.\r
566\r
567 @retval EFI_SUCCESS The option is generated and filled in to Buffer.\r
568\r
569**/\r
570EFI_STATUS\r
571Ip6FillHopByHop (\r
572 OUT UINT8 *Buffer,\r
573 IN OUT UINTN *BufferLen,\r
574 IN UINT8 NextHeader\r
575 )\r
576{\r
577 UINT8 BufferArray[8];\r
578\r
579 if (*BufferLen < 8) {\r
580 *BufferLen = 8;\r
581 return EFI_BUFFER_TOO_SMALL;\r
582 }\r
583\r
584 //\r
585 // Form the Hop-By-Hop option in network order.\r
586 // NextHeader (1 octet) + HdrExtLen (1 octet) + RouterAlertOption(4 octets) + PadN\r
587 // The Hdr Ext Len is the length in 8-octet units, and does not including the first 8 octets.\r
588 //\r
589 ZeroMem (BufferArray, sizeof (BufferArray));\r
590 BufferArray[0] = NextHeader;\r
591 BufferArray[2] = 0x5;\r
592 BufferArray[3] = 0x2;\r
593 BufferArray[6] = 1;\r
594\r
595 CopyMem (Buffer, BufferArray, sizeof (BufferArray));\r
596 return EFI_SUCCESS;\r
597}\r
598\r
599/**\r
600 Insert a Fragment Header to the Extension headers and output it in UpdatedExtHdrs.\r
601\r
602 @param[in] IpSb The IP6 service instance to transmit the packet.\r
603 @param[in] NextHeader The extension header type of first extension header.\r
604 @param[in] LastHeader The extension header type of last extension header.\r
605 @param[in] ExtHdrs The length of the original extension header.\r
606 @param[in] ExtHdrsLen The length of the extension headers.\r
607 @param[in] FragmentOffset The fragment offset of the data following the header.\r
608 @param[out] UpdatedExtHdrs The updated ExtHdrs with Fragment header inserted.\r
609 It's caller's responsiblity to free this buffer.\r
610\r
611 @retval EFI_OUT_OF_RESOURCES Failed to finish the operation due to lake of\r
612 resource.\r
613 @retval EFI_UNSUPPORTED The extension header specified in ExtHdrs is not\r
614 supported currently.\r
615 @retval EFI_SUCCESS The operation performed successfully.\r
616\r
617**/\r
618EFI_STATUS\r
619Ip6FillFragmentHeader (\r
620 IN IP6_SERVICE *IpSb,\r
621 IN UINT8 NextHeader,\r
622 IN UINT8 LastHeader,\r
623 IN UINT8 *ExtHdrs,\r
624 IN UINT32 ExtHdrsLen,\r
625 IN UINT16 FragmentOffset,\r
626 OUT UINT8 **UpdatedExtHdrs\r
627 )\r
628{\r
629 UINT32 Length;\r
630 UINT8 *Buffer;\r
631 UINT32 FormerHeader;\r
632 UINT32 Offset;\r
633 UINT32 Part1Len;\r
634 UINT32 HeaderLen;\r
635 UINT8 Current;\r
636 IP6_FRAGMENT_HEADER FragmentHead;\r
637\r
638 if (UpdatedExtHdrs == NULL) {\r
639 return EFI_INVALID_PARAMETER;\r
640 }\r
641\r
642 Length = ExtHdrsLen + sizeof (IP6_FRAGMENT_HEADER);\r
643 Buffer = AllocatePool (Length);\r
644 if (Buffer == NULL) {\r
645 return EFI_OUT_OF_RESOURCES;\r
646 }\r
647\r
648 Offset = 0;\r
649 Part1Len = 0;\r
650 FormerHeader = 0;\r
651 Current = NextHeader;\r
652\r
653 while ((ExtHdrs != NULL) && (Offset <= ExtHdrsLen)) {\r
654 switch (NextHeader) {\r
655 case IP6_ROUTING:\r
656 case IP6_HOP_BY_HOP:\r
657 case IP6_DESTINATION:\r
658 Current = NextHeader;\r
659 NextHeader = *(ExtHdrs + Offset);\r
660\r
661 if ((Current == IP6_DESTINATION) && (NextHeader != IP6_ROUTING)) {\r
662 //\r
663 // Destination Options header should occur at most twice, once before\r
664 // a Routing header and once before the upper-layer header. Here we\r
665 // find the one before the upper-layer header. Insert the Fragment\r
666 // Header before it.\r
667 //\r
668 CopyMem (Buffer, ExtHdrs, Part1Len);\r
669 *(Buffer + FormerHeader) = IP6_FRAGMENT;\r
670 //\r
671 // Exit the loop.\r
672 //\r
673 Offset = ExtHdrsLen + 1;\r
674 break;\r
675 }\r
676\r
677\r
678 FormerHeader = Offset;\r
679 HeaderLen = (*(ExtHdrs + Offset + 1) + 1) * 8;\r
680 Part1Len = Part1Len + HeaderLen;\r
681 Offset = Offset + HeaderLen;\r
682 break;\r
683\r
684 case IP6_FRAGMENT:\r
685 Current = NextHeader;\r
686\r
687 if (Part1Len != 0) {\r
688 CopyMem (Buffer, ExtHdrs, Part1Len);\r
689 }\r
690\r
691 *(Buffer + FormerHeader) = IP6_FRAGMENT;\r
692\r
693 //\r
694 // Exit the loop.\r
695 //\r
696 Offset = ExtHdrsLen + 1;\r
697 break;\r
698\r
699 case IP6_AH:\r
700 Current = NextHeader;\r
701 NextHeader = *(ExtHdrs + Offset);\r
702 //\r
703 // RFC2402, Payload length is specified in 32-bit words, minus "2".\r
704 //\r
705 HeaderLen = (*(ExtHdrs + Offset + 1) + 2) * 4;\r
706 Part1Len = Part1Len + HeaderLen;\r
707 Offset = Offset + HeaderLen;\r
708 break;\r
709\r
710 default:\r
711 if (Ip6IsValidProtocol (IpSb, NextHeader)) {\r
712 Current = NextHeader;\r
713 CopyMem (Buffer, ExtHdrs, Part1Len);\r
714 *(Buffer + FormerHeader) = IP6_FRAGMENT;\r
715 //\r
716 // Exit the loop.\r
717 //\r
718 Offset = ExtHdrsLen + 1;\r
719 break;\r
720 }\r
721\r
722 FreePool (Buffer);\r
723 return EFI_UNSUPPORTED;\r
724 }\r
725 }\r
726\r
727 //\r
728 // Append the Fragment header. If the fragment offset indicates the fragment\r
729 // is the first fragment.\r
730 //\r
731 if ((FragmentOffset & IP6_FRAGMENT_OFFSET_MASK) == 0) {\r
732 FragmentHead.NextHeader = Current;\r
733 } else {\r
734 FragmentHead.NextHeader = LastHeader;\r
735 }\r
736\r
737 FragmentHead.Reserved = 0;\r
738 FragmentHead.FragmentOffset = HTONS (FragmentOffset);\r
739 FragmentHead.Identification = mIp6Id;\r
740\r
741 CopyMem (Buffer + Part1Len, &FragmentHead, sizeof (IP6_FRAGMENT_HEADER));\r
742\r
743 if ((ExtHdrs != NULL) && (Part1Len < ExtHdrsLen)) {\r
744 //\r
745 // Append the part2 (fragmentable part) of Extension headers\r
746 //\r
747 CopyMem (\r
748 Buffer + Part1Len + sizeof (IP6_FRAGMENT_HEADER),\r
749 ExtHdrs + Part1Len,\r
750 ExtHdrsLen - Part1Len\r
751 );\r
752 }\r
753\r
754 *UpdatedExtHdrs = Buffer;\r
755\r
756 return EFI_SUCCESS;\r
757}\r
758\r
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