tag	line	file	source code
tcp	204	net/ipv4/ip_fw.c	struct tcphdr    *tcp=(struct tcphdr *)((unsigned long *)ip+ip->ihl);
tcp	286	net/ipv4/ip_fw.c	src_port=ntohs(tcp->source);
tcp	287	net/ipv4/ip_fw.c	dst_port=ntohs(tcp->dest);
tcp	288	net/ipv4/ip_fw.c	if(tcp->ack)
tcp	291	net/ipv4/ip_fw.c	if(tcp->syn && notcpack)