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| 12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
| 13 | ;; Version 2, June 1991 ;; |
13 | ;; Version 2, June 1991 ;; |
| 14 | ;; ;; |
14 | ;; ;; |
| 15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 16 | 16 | ||
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| 17 | $Revision: 1251 $ |
17 | $Revision: 1254 $ |
| 18 | 18 | ||
| 19 | 19 | ||
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| 75 | UDP_handler: |
75 | UDP_handler: |
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| 76 | 76 | ||
| 77 | DEBUGF 1,"UDP_Handler\n" |
77 | DEBUGF 1,"UDP_Handler\n" |
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| 78 | ; First validate, checksum: |
- | |
| 79 | - | ||
| 80 | DEBUGF 1,"Real UDP checksum: %x\n", [edx + UDP_Packet.Checksum]:4 |
- | |
| 81 | mov [edx + UDP_Packet.Checksum], 0 |
78 | ; First validate, checksum: |
| Line 82... | Line 79... | ||
| 82 | 79 | ||
| 83 | pusha |
80 | pusha |
| 84 | 81 | ||
| 85 | rol cx, 8 |
82 | rol cx, 8 |
| 86 | push cx |
83 | push cx |
| 87 | rol cx, 8 |
84 | rol cx, 8 |
| Line -... | Line 85... | ||
| - | 85 | push word IP_PROTO_UDP shl 8 |
|
| - | 86 | push edi |
|
| - | 87 | push esi |
|
| 88 | push word IP_PROTO_UDP shl 8 |
88 | |
| 89 | push edi |
89 | mov di, [edx + UDP_Packet.Checksum] |
| 90 | push esi |
90 | mov [edx + UDP_Packet.Checksum], 0 |
| 91 | - | ||
| 92 | mov esi, edx |
91 | |
| 93 | xor edx, edx |
92 | mov esi, edx |
| 94 | call checksum_1 |
93 | xor edx, edx |
| 95 | ; Checksum for pseudoheader |
94 | call checksum_1 |
| 96 | mov ecx, 12 |
95 | mov ecx, 12 |
| Line -... | Line 96... | ||
| - | 96 | mov esi, esp |
|
| 97 | mov esi, esp |
97 | call checksum_1 |
| - | 98 | add esp, 12 |
|
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| 98 | call checksum_1 |
- | |
| - | 99 | call checksum_2 |
|
| Line 99... | Line 100... | ||
| 99 | add esp, 12 |
100 | |
| 100 | call checksum_2 |
101 | cmp di, dx |
| 101 | 102 | popa |
|
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| 205 | 206 | ||
| Line 206... | Line 207... | ||
| 206 | mov di , IP_PROTO_UDP |
207 | mov di , IP_PROTO_UDP |
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| 207 | 208 | ||
| 208 | sub esp, 8 ; reserve some place in stack for later |
- | |
| 209 | 209 | sub esp, 8 ; reserve some place in stack for later |
|
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| 210 | ; Create the pseudoheader in stack, |
210 | |
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| 211 | ; (now that we still have all the variables that are needed.) |
211 | ; Create a part pseudoheader in stack, |