tcpipv6hdr
struct tcpipv6hdr *ti6;
ti6 = (struct tcpipv6hdr *)headers;
bzero(&td->td_ti6, sizeof(struct tcpipv6hdr));
struct tcpipv6hdr td_ti6;
struct tcpipv6hdr tcpip6;
struct tcpipv6hdr *, int);
struct tcpiphdr *ti, struct tcpipv6hdr *ti6, int req)