File syn_tcp.c¶

Zero-Alloc Native TCP State Machine & Segment Engine Implementation.

#include "syntropic/net/syn_tcp.h"
#include "syntropic/port/syn_port_system.h"
#include "syntropic/sched/syn_sched.h"
#include "syntropic/util/syn_assert.h"
#include "syntropic/util/syn_pack.h"
#include <string.h>

Public Functions¶

Type	Name
uint16_t	syn_tcp_checksum (uint32_t src_ip, uint32_t dst_ip, const uint8_t * tcp_seg, size_t len) Compute TCP 16-bit 1's complement checksum over pseudo-header and segment.
SYN_Status	syn_tcp_init (SYN_TCP * tcp, SYN_ETH * eth) Initialize TCP Stack.
SYN_Status	syn_tcp_listen (SYN_TCP * tcp, uint16_t port) Bind TCP listener to port.
SYN_Status	syn_tcp_process_packet (SYN_TCP * tcp, const uint8_t * ip_packet, size_t len, uint8_t * tx_out, size_t * tx_len) Process incoming TCP IPv4 segment.

Public Static Functions¶

Type	Name
void	build_tcp_segment (SYN_TCP * tcp, SYN_TcpConn * conn, uint8_t flags, const uint8_t * payload, size_t payload_len, uint8_t * tx_out, size_t * tx_len) Build outbound TCP segment frame into buffer.

Public Functions Documentation¶

function syn_tcp_checksum¶

Compute TCP 16-bit 1's complement checksum over pseudo-header and segment.

uint16_t syn_tcp_checksum (
    uint32_t src_ip,
    uint32_t dst_ip,
    const uint8_t * tcp_seg,
    size_t len
)

Parameters:

src_ip Source 32-bit IPv4 address.
dst_ip Destination 32-bit IPv4 address.
tcp_seg Pointer to raw TCP segment bytes.
len TCP segment length in bytes.

Returns:

Computed 16-bit TCP checksum.

function syn_tcp_init¶

Initialize TCP Stack.

SYN_Status syn_tcp_init (
    SYN_TCP * tcp,
    SYN_ETH * eth
)

Parameters:

tcp Pointer to TCP stack container.
eth Pointer to Ethernet interface engine instance.

Returns:

SYN_OK on success.

function syn_tcp_listen¶

Bind TCP listener to port.

SYN_Status syn_tcp_listen (
    SYN_TCP * tcp,
    uint16_t port
)

Parameters:

tcp Pointer to TCP stack container.
port Port number to listen on.

Returns:

SYN_OK on success.

function syn_tcp_process_packet¶

Process incoming TCP IPv4 segment.

SYN_Status syn_tcp_process_packet (
    SYN_TCP * tcp,
    const uint8_t * ip_packet,
    size_t len,
    uint8_t * tx_out,
    size_t * tx_len
)

Parameters:

tcp Pointer to TCP stack container.
ip_packet Pointer to raw IPv4 packet.
len IPv4 packet byte length.
tx_out Output buffer for immediate TCP reply segment if generated.
tx_len Pointer to receive output segment byte length.

Returns:

SYN_OK on success.

Public Static Functions Documentation¶

function build_tcp_segment¶

Build outbound TCP segment frame into buffer.

static void build_tcp_segment (
    SYN_TCP * tcp,
    SYN_TcpConn * conn,
    uint8_t flags,
    const uint8_t * payload,
    size_t payload_len,
    uint8_t * tx_out,
    size_t * tx_len
)

Parameters:

tcp Pointer to TCP stack.
conn Pointer to TCP connection block.
flags TCP control flags bitmask.
payload Pointer to payload buffer.
payload_len Payload byte length.
tx_out Output Ethernet frame buffer.
tx_len Output Ethernet frame length pointer.

The documentation for this class was generated from the following file src/syntropic/net/syn_tcp.c