Structs starting with `t' in bsd/netinet

• tbf bsd/netinet/ip_mroute.h:262
• tcpcb bsd/netinet/tcp_var.h:67
• tcphdr bsd/netinet/tcp.h:67
• tcpiphdr bsd/netinet/tcpip.h:63
• tcpopt bsd/netinet/tcp_var.h:162