#include <sys/types.h>
#include <dev/netbuf.h>
#include <netinet/tcp_fsm.h>
Data Structures | |
struct | tcp_socket |
TCP socket information structure. More... | |
struct | udp_socket |
UDP socket information structure. More... | |
typedef udp_socket | UDPSOCKET |
UDP socket type. | |
Defines | |
#define | SO_ACK 0x10 |
Socket transmit flag. Send ACK. | |
#define | SO_FIN 0x01 |
Socket transmit flag. Send FIN after all data has been transmitted. | |
#define | SO_FORCE 0x08 |
Socket transmit flag. Force sending ACK. | |
#define | SO_SYN 0x02 |
Socket transmit flag. Send SYN first. | |
Typedefs | |
typedef tcp_socket | TCPSOCKET |
TCP socket type. | |
Functions | |
int | NutTcpOutput (TCPSOCKET *sock, CONST u_char *data, u_short size) |
Initiate TCP segment transmission. | |
int | NutTcpReject (NETBUF *nb) |
Reject an incoming segment. | |
void | NutUdpInput (NETBUF *nb, ureg_t bcast) |
Handle incoming UDP packets. | |
int | NutUdpOutput (UDPSOCKET *sock, u_long dest, u_short port, NETBUF *nb) |
Send a UDP packet. |
Initiate TCP segment transmission.
Check the TCP socket status and send any segment waiting for transmission.
The function will not return until the data has been stored in the network device hardware for transmission. If the device is not ready for transmitting a new packet, the calling thread will be suspended until the device becomes ready again.
If the target host is connected through an Ethernet network and if the hardware address of that host is currently unknown, an ARP request is sent out and the function will block until a response is received or an ARP timeout occurs.
Segments containing data or SYN and FIN flags are added to a special queue for unacknowledged segments and will be retransmitted by the TCP timer thread, if not acknowledged by the remote within a specific time. The state machine will remove these segments from the queue as soon as they are acknowledged.
sock | Socket descriptor. This pointer must have been retrieved by calling NutTcpCreateSocket(). | |
data | Pointer to TCP segment contents. | |
size | TCP segment length. |
int NutTcpReject | ( | NETBUF * | nb | ) |
Reject an incoming segment.
Send RST in response to an incoming segment, which should be rejected.
The function avoids to send out a RST segment in response to an incoming RST segment.
nb | Network buffer structure of the incoming segment. Will be released within this function. |