netinet/tcp.h -- tcphdr structure compile error

Hi experts.

I've written a program to send tcp/ip packets using raw sockets on unix. I've got rid of all the compile errors, except for one remaining problem.

First of all, here are the libraries I've included:

# include <stdio.h>
# include <string.h>
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <netinet/ip.h>
# include <netinet/tcp.h>

My code just basically creates one big buffer and points "ip" and "tcphdr" structures within this buffer. I then fill out all the values and attempt to fire off the packet.

All my remaining compile errors relate to tcphdr... I've looked at /usr/include/tcp.h and cannot make any sense of this at all. The tcphdr structure DOES have the members it is complaining about and they are spelt correctly!

net.c: In function ‘SEND’:
net.c:41: error: ‘struct tcphdr’ has no member named ‘th_sport’
net.c:42: error: ‘struct tcphdr’ has no member named ‘th_dport’
net.c:43: error: ‘struct tcphdr’ has no member named ‘th_seq’
net.c:44: error: ‘struct tcphdr’ has no member named ‘th_ack’
net.c:45: error: ‘struct tcphdr’ has no member named ‘th_x2’
net.c:46: error: ‘struct tcphdr’ has no member named ‘th_off’
net.c:47: error: ‘struct tcphdr’ has no member named ‘th_flags’
net.c:47: error: ‘TH_SYN’ undeclared (first use in this function)
net.c:47: error: (Each undeclared identifier is reported only once
net.c:47: error: for each function it appears in.)
net.c:48: error: ‘struct tcphdr’ has no member named ‘th_win’
net.c:49: error: ‘struct tcphdr’ has no member named ‘th_sum’
net.c:50: error: ‘struct tcphdr’ has no member named ‘th_urp’


I created an instance of the tcphdr structure like this:

struct tcphdr * tcph = ( struct tcphdr * ) datagram + sizeof ( struct ip ) ;



And I was setting the members like follows:

tcph->th_dport = htons ( port ) ;



Suggestions?