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Fixed bug on TCP checksum calculation.

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This commit is contained in:
Matias Fontanini
2012-08-15 08:34:32 -03:00
parent 0014d5e0f7
commit ad7936dfbe
1 changed files with 3 additions and 1 deletions
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4
src/tcp.cpp
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@@ -293,7 +293,9 @@ void Tins::TCP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PD
const Tins::IP *ip_packet = dynamic_cast<const Tins::IP*>(parent);
memcpy(tcp_start, &_tcp, sizeof(tcphdr));
if(!_tcp.check && ip_packet) {
uint32_t checksum = Utils::pseudoheader_checksum(ip_packet->src_addr(), ip_packet->dst_addr(), size(), Constants::IP::PROTO_TCP) +
uint32_t checksum = Utils::pseudoheader_checksum(Utils::net_to_host_l(ip_packet->src_addr()),
Utils::net_to_host_l(ip_packet->dst_addr()),
size(), Constants::IP::PROTO_TCP) +
Utils::do_checksum(tcp_start, tcp_start + total_sz);
while (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16);