sk_setsockopt
int sk_setsockopt(struct sock *sk, int level, int optname,
return sk_setsockopt(sk, SOL_SOCKET, optname,
return sk_setsockopt(sock->sk, level, optname,
err = sk_setsockopt(sk, level, optname, optval, optlen);
ret = sk_setsockopt(ssk, SOL_SOCKET, optname, optval, optlen);