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DHCP is working. Fixed ip checksum problem.

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This commit is contained in:
Matias Fontanini
2011-08-17 15:12:29 -03:00
parent 729a0296ac
commit 4dfa4d70eb
2 changed files with 7 additions and 11 deletions
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6
src/tcp.cpp
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@@ -151,14 +151,14 @@ 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 = PDU::pseudoheader_checksum(ip_packet->source_address(), ip_packet->dest_address(), size(), IPPROTO_TCP) +
PDU::do_checksum(tcp_start + sizeof(tcphdr), tcp_start + total_sz) + PDU::do_checksum((uint8_t*)&_tcp, ((uint8_t*)&_tcp) + sizeof(tcphdr));
PDU::do_checksum(tcp_start, tcp_start + total_sz);
while (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16);
_tcp.check = Utils::net_to_host_s(~checksum);
((tcphdr*)tcp_start)->check = Utils::net_to_host_s(~checksum);
}
memcpy(tcp_start, &_tcp, sizeof(tcphdr));
_tcp.check = 0;
}