tcp_setsockopt 381 include/net/tcp.h extern int tcp_setsockopt(struct sock *sk, int level, tcp_setsockopt 2364 net/ipv4/tcp_ipv4.c .setsockopt = tcp_setsockopt, tcp_setsockopt 2031 net/ipv6/tcp_ipv6.c .setsockopt = tcp_setsockopt,