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Compute the TCP checksum

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This commit is contained in:
Baptiste Wicht 2016-09-13 22:50:56 +02:00
parent 96b48c061f
commit a32a4a8aad
1 changed files with 15 additions and 1 deletions
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16
kernel/src/net/tcp_layer.cpp
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@ -9,6 +9,7 @@
#include "net/tcp_layer.hpp"
#include "net/dns_layer.hpp"
#include "net/checksum.hpp"
#include "kernel_utils.hpp"
@ -32,7 +33,20 @@ void compute_checksum(network::ethernet::packet& packet){
tcp_header->checksum = 0;
//TODO
// Accumulate the Payload
auto sum = network::checksum_add_bytes(packet.payload + packet.index, 20); // TODO What is the length
// Accumulate the IP addresses
sum += network::checksum_add_bytes(&ip_header->source_ip, 8);
// Accumulate the IP Protocol
sum += ip_header->protocol;
// Accumulate the UDP length
sum += 20;
// Complete the 1-complement sum
tcp_header->checksum = switch_endian_16(network::checksum_finalize_nz(sum));
}
uint16_t get_default_flags(){