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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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| 17 | $Revision: 2369 $ |
17 | $Revision: 2385 $ |
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| 18 | 18 | ||
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| 123 | neg [esi + UDP_header.Checksum] ; substract checksum from 0 |
123 | neg [esi + UDP_header.Checksum] ; substract checksum from 0 |
| 124 | jz .no_checksum ; if checksum is zero, it is considered valid and we continue processing |
124 | jz .no_checksum ; if checksum is zero, it is considered valid and we continue processing |
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| 125 | ; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct |
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| 126 | 125 | ; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct |
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| 127 | push esi |
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| 128 | UDP_checksum (edi), (edi+4) |
126 | |
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| 129 | pop esi |
127 | UDP_checksum (edi), (edi+4) |
| 130 | jnz .checksum_mismatch |
128 | ;;; jnz .checksum_mismatch |
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| 131 | 129 | ||