TCP_RACK_LOSS_DETECTION 1951 net/ipv4/tcp_input.c return sock_net(sk)->ipv4.sysctl_tcp_recovery & TCP_RACK_LOSS_DETECTION; TCP_RACK_LOSS_DETECTION 2690 net/ipv4/tcp_ipv4.c net->ipv4.sysctl_tcp_recovery = TCP_RACK_LOSS_DETECTION;