void Connection::transmit(TCP::Packet_ptr packet) {
debug("<TCP::Connection::transmit> Transmitting: %s \n", packet->to_string().c_str());
host_.transmit(packet);
// Don't think we would like to retransmit reset packets..?
//if(!packet->isset(RST))
// add_retransmission(packet);
}
void TCP::transmit(tcp::Packet_ptr packet) {
// Generate checksum.
packet->set_tcp_checksum();
debug2("<TCP::transmit> %s\n", packet->to_string().c_str());
// Stat increment bytes transmitted and packets transmitted
(*bytes_tx_) += packet->tcp_data_length();
(*packets_tx_)++;
_network_layer_out(std::move(packet));
}
void Connection::add_option(TCP::Option::Kind kind, TCP::Packet_ptr packet) {
switch(kind) {
case Option::MSS: {
packet->add_tcp_option<Option::opt_mss>(host_.MSS());
debug2("<TCP::Connection::add_option@Option::MSS> Packet: %s - MSS: %u\n",
packet->to_string().c_str(), ntohs(*(uint16_t*)(packet->tcp_options()+2)));
break;
}
default:
break;
}
}
void Connection::transmit(TCP::Packet_ptr packet) {
if(!rttm.active and packet->end() == cb.SND.NXT) {
//printf("<TCP::Connection::transmit> Starting RTT measurement.\n");
rttm.start();
}
//if(packet->seq() + packet->tcp_data_length() != cb.SND.NXT)
//printf("<TCP::Connection::transmit> rseq=%u rack=%u\n",
// packet->seq() - cb.ISS, packet->ack() - cb.IRS);
debug2("<TCP::Connection::transmit> TX %s\n", packet->to_string().c_str());
host_.transmit(packet);
if(packet->should_rtx() and !rtx_timer.active) {
rtx_start();
}
}
void Connection::add_retransmission(TCP::Packet_ptr packet) {
debug2("<TCP::Connection::add_retransmission> Packet added to retransmission. \n");
auto self = shared_from_this();
hw::PIT::instance().onTimeout(RTO(), [packet, self] {
// Packet hasnt been ACKed.
if(packet->seq() > self->tcb().SND.UNA) {
debug("<TCP::Connection::add_retransmission@onTimeout> Packet unacknowledge, retransmitting...\n");
self->transmit(packet);
} else {
debug2("<TCP::Connection::add_retransmission@onTimeout> Packet acknowledged %s \n", packet->to_string().c_str());
// Signal user?
}
});
}