Symbol: TCPOLEN_SACK_PERMITTED
sys/netinet/tcp.h
101
(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
sys/netinet/tcp_input.c
2207
if (!tp->sack_enable || optlen!=TCPOLEN_SACK_PERMITTED)