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UDP checksum is now calculated always inside write_serialization.

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This commit is contained in:
Matias Fontanini
2013-04-12 13:42:11 -03:00
parent f4522acd44
commit 30d6a4f2e0
3 changed files with 17 additions and 9 deletions
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15
src/udp.cpp
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@@ -77,19 +77,24 @@ void UDP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *par
assert(total_sz >= sizeof(udphdr));
#endif
const Tins::IP *ip_packet = dynamic_cast<const Tins::IP*>(parent);
_udp.check = 0;
if(inner_pdu())
length(sizeof(udphdr) + inner_pdu()->size());
else
length(sizeof(udphdr));
std::memcpy(buffer, &_udp, sizeof(udphdr));
if(!_udp.check && ip_packet) {
uint32_t checksum = Utils::pseudoheader_checksum(ip_packet->src_addr(), ip_packet->dst_addr(), size(), Constants::IP::PROTO_UDP) +
Utils::do_checksum(buffer, buffer + total_sz);
if(ip_packet) {
uint32_t checksum = Utils::pseudoheader_checksum(
ip_packet->src_addr(),
ip_packet->dst_addr(),
size(),
Constants::IP::PROTO_UDP
) + Utils::do_checksum(buffer, buffer + total_sz);
while (checksum >> 16)
checksum = (checksum & 0xffff)+(checksum >> 16);
((udphdr*)buffer)->check = Endian::host_to_be<uint16_t>(~checksum);
_udp.check = Endian::host_to_be<uint16_t>(~checksum);
((udphdr*)buffer)->check = _udp.check;
}
_udp.check = 0;
}
bool UDP::matches_response(uint8_t *ptr, uint32_t total_sz) {