#include <stdint.h>

typedef struct tcb {
     uint32_t seq;
     uint32_t ack;

     uint16_t sport;         // the "socket quad"
     uint16_t dport;
     in_addr_t saddr;
     in_addr_t daddr;

     int state;              // from netinet/tcp.h
     
     uint32_t window;        // including scaling
     uint8_t  window_scale;  // as specified in SYN, as per RFC 1232

     pkt_t *first_unacked;
     pkt_t *last_sent;

     int payload_fd;        // fd of the payload file
     int payload_started;   // helper state
     
} tcb_t;