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Code Issues Releases Wiki Activity

IP and TCP now calculate checksums always inside write_serialization.

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This commit is contained in:
Matias Fontanini
2013-04-11 00:57:36 -03:00
parent 1fbef641da
commit f4522acd44
3 changed files with 37 additions and 27 deletions
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7
src/ip.cpp
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@@ -378,6 +378,7 @@ void IP::prepare_for_serialize(const PDU *parent) {
void IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU* parent) {
uint32_t my_sz = header_size();
assert(total_sz >= my_sz);
check(0);
if(inner_pdu()) {
uint32_t new_flag;
switch(inner_pdu()->pdu_type()) {
@@ -415,12 +416,12 @@ void IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU* pare
ptr_buffer = write_option(*it, ptr_buffer);
memset(buffer + sizeof(_ip) + _options_size, 0, _padded_options_size - _options_size);
if(parent && !_ip.check) {
if(parent) {
uint32_t checksum = Utils::do_checksum(buffer, buffer + sizeof(_ip) + _padded_options_size);
while (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16);
((iphdr*)buffer)->check = Endian::host_to_be<uint16_t>(~checksum);
this->check(0);
check(~checksum);
((iphdr*)buffer)->check = _ip.check;
}
}