error_t openudp_send(OpenQueueEntry_t* msg) {
msg->owner = COMPONENT_OPENUDP;
msg->l4_protocol = IANA_UDP;
msg->l4_payload = msg->payload;
msg->l4_length = msg->length;
packetfunctions_reserveHeaderSize(msg,sizeof(udp_ht));
packetfunctions_htons(msg->l4_sourcePortORicmpv6Type,&(msg->payload[0]));
packetfunctions_htons(msg->l4_destination_port,&(msg->payload[2]));
packetfunctions_htons(msg->length,&(msg->payload[4]));
packetfunctions_calculateChecksum(msg,(uint8_t*)&(((udp_ht*)msg->payload)->checksum));
return forwarding_send(msg);
}
void prependTCPHeader(OpenQueueEntry_t* msg,
bool ack,
bool push,
bool rst,
bool syn,
bool fin) {
msg->l4_protocol = IANA_TCP;
packetfunctions_reserveHeaderSize(msg,sizeof(tcp_ht));
packetfunctions_htons(tcp_vars.myPort ,(uint8_t*)&(((tcp_ht*)msg->payload)->source_port));
packetfunctions_htons(tcp_vars.hisPort ,(uint8_t*)&(((tcp_ht*)msg->payload)->destination_port));
packetfunctions_htonl(tcp_vars.mySeqNum ,(uint8_t*)&(((tcp_ht*)msg->payload)->sequence_number));
packetfunctions_htonl(tcp_vars.hisNextSeqNum ,(uint8_t*)&(((tcp_ht*)msg->payload)->ack_number));
((tcp_ht*)msg->payload)->data_offset = TCP_DEFAULT_DATA_OFFSET;
((tcp_ht*)msg->payload)->control_bits = 0;
if (ack==TCP_ACK_YES) {
((tcp_ht*)msg->payload)->control_bits |= 1 << TCP_ACK;
} else {
packetfunctions_htonl(0,(uint8_t*)&(((tcp_ht*)msg->payload)->ack_number));
}
if (push==TCP_PSH_YES) {
((tcp_ht*)msg->payload)->control_bits |= 1 << TCP_PSH;
}
if (rst==TCP_RST_YES) {
((tcp_ht*)msg->payload)->control_bits |= 1 << TCP_RST;
}
if (syn==TCP_SYN_YES) {
((tcp_ht*)msg->payload)->control_bits |= 1 << TCP_SYN;
}
if (fin==TCP_FIN_YES) {
((tcp_ht*)msg->payload)->control_bits |= 1 << TCP_FIN;
}
packetfunctions_htons(TCP_DEFAULT_WINDOW_SIZE ,(uint8_t*)&(((tcp_ht*)msg->payload)->window_size));
packetfunctions_htons(TCP_DEFAULT_URGENT_POINTER ,(uint8_t*)&(((tcp_ht*)msg->payload)->urgent_pointer));
//calculate checksum last to take all header fields into account
packetfunctions_calculateChecksum(msg,(uint8_t*)&(((tcp_ht*)msg->payload)->checksum));
}
