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Code Issues Releases Wiki Activity

Use Utils::sum_range straight into ICMP checksum value

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Matias Fontanini
2016-02-20 11:02:20 -08:00
parent f3448f1797
commit 745071af65
1 changed files with 2 additions and 7 deletions
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9
src/icmp.cpp
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@@ -265,13 +265,8 @@ void ICMP::write_serialization(uint8_t* buffer, uint32_t total_sz, const PDU *)
extensions_.serialize(extensions_ptr, total_sz - (extensions_ptr - buffer));
}
// Calculate checksum
uint32_t checksum = Utils::sum_range(buffer, buffer + total_sz);
while (checksum >> 16) {
checksum = (checksum & 0xffff) + (checksum >> 16);
}
// Write back only the 2 checksum bytes
header_.check = ~checksum;
// Calculate checksum and write them on the serialized header
header_.check = ~Utils::sum_range(buffer, buffer + total_sz);
memcpy(buffer + 2, &header_.check, sizeof(uint16_t));
}