tcp.h

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#ifndef __NET__TCP_H__
#define __NET__TCP_H__
 
#include "net/ipv4.h"
#include "net/netdev.h"
#include <type.h>
 
struct __attribute__((packed)) tcp_header {
    uint16_t source_port;
    uint16_t destination_port;
    uint32_t sequence;
    uint32_t acknowledgment;
 
    uint8_t offset;
    uint8_t flags;
 
    uint16_t window;
    uint16_t checksum;
    uint16_t urgent_ptr;
} __attribute__((packed));
 
void handle_tcp(netdev_t* dev, struct ipv4_header* ip, uint8_t mac_dst[6]);
 
typedef struct {
    uint16_t mss; // 0 = tidak ada
    uint8_t has_wscale;
    uint8_t wscale; // 0 = tidak ada
    uint8_t sack_permitted;
    uint8_t has_timestamp;
    uint32_t ts_val;
    uint32_t ts_ecr;
} tcp_options_t;
 
void send_tcp_data(netdev_t* dev, struct ipv4_header* ip,
           struct tcp_header* tcp, uint8_t* data, size_t len,
           uint8_t mac_dst[6]);
 
void parse_tcp_options(struct tcp_header* tcp, tcp_options_t* out);
uint8_t
build_synack_options(netdev_t* dev, uint8_t* buf, tcp_options_t* client_opts);
 
void send_command(netdev_t* dev, struct ipv4_header* ip, struct tcp_header* tcp,
          tcp_options_t* opt, uint8_t flags, uint8_t mac_dst[6]);
 
#endif // __NET__TCP_H__