TCPOLEN_SACK_PERMITTED   97 netinet/tcp.h  (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
TCPOLEN_SACK_PERMITTED 2325 netinet/tcp_input.c 			if (!tp->sack_enable || optlen!=TCPOLEN_SACK_PERMITTED)