tcp.h

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/*
 * Copyright (C) 2015-2017 Simon Brummer
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include "byteorder.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define TCP_HDR_OFFSET_MIN (0x05) 
#define TCP_HDR_OFFSET_MAX (0x0F) 

#define TCP_OPTION_KIND_EOL (0x00)  
#define TCP_OPTION_KIND_NOP (0x01)  
#define TCP_OPTION_KIND_MSS (0x02)  

#define TCP_OPTION_LENGTH_MIN (2U)    
#define TCP_OPTION_LENGTH_MSS (0x04)  

typedef struct __attribute__((packed)) {
    network_uint16_t src_port;     
    network_uint16_t dst_port;     
    network_uint32_t seq_num;      
    network_uint32_t ack_num;      
    network_uint16_t off_ctl;      
    network_uint16_t window;       
    network_uint16_t checksum;     
    network_uint16_t urgent_ptr;   
} tcp_hdr_t;

typedef struct __attribute__((packed)) {
    uint8_t kind;     
    uint8_t length;   
    uint8_t value[];  
} tcp_hdr_opt_t;

void tcp_hdr_print(tcp_hdr_t *hdr);
 
#ifdef __cplusplus
}
#endif