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Working ethernet II PDU. Fixed bugs in IP and added checksum calculation. Added layer2 sending to PacketSender

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This commit is contained in:
Santiago Alessandri
2011-08-15 18:16:48 -03:00
parent 5c412208f9
commit b76c9d0525
9 changed files with 192 additions and 136 deletions
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12
src/ip.cpp
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@@ -185,7 +185,7 @@ Tins::PDU *Tins::IP::recv_response(PacketSender *sender) {
return sender->recv_l3(this, (struct sockaddr*)&link_addr, sizeof(link_addr), type);
}
void Tins::IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *) {
void Tins::IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU* parent) {
uint32_t my_sz = header_size();
uint32_t new_flag;
assert(total_sz >= my_sz);
@@ -198,8 +198,16 @@ void Tins::IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU
new_flag = IPPROTO_IP;
flag(new_flag);
_ip.protocol = new_flag;
_ip.tot_len = total_sz;
_ip.tot_len = Utils::net_to_host_s(total_sz);
_ip.ihl = my_sz / sizeof(uint32_t);
if (parent && (_ip.check == 0)) {
uint32_t checksum = PDU::do_checksum((uint8_t*)&_ip, ((uint8_t*)&_ip) + sizeof(iphdr));
checksum += PDU::do_checksum(buffer + sizeof(iphdr), buffer + total_sz);
while (checksum >> 16)
checksum = (checksum & 0xffff) + (checksum >> 16);
_ip.check = Utils::net_to_host_s(~checksum);
}
memcpy(buffer, &_ip, sizeof(iphdr));
/* IP Options here... */