TCP_SACK_SEEN 249 net/ipv4/syncookies.c tcp_opt->sack_ok = (options & TS_OPT_SACK) ? TCP_SACK_SEEN : 0; TCP_SACK_SEEN 2770 net/ipv4/tcp.c tp->rx_opt.sack_ok |= TCP_SACK_SEEN; TCP_SACK_SEEN 3908 net/ipv4/tcp_input.c opt_rx->sack_ok = TCP_SACK_SEEN;