tcp_v4_send_check 406 include/net/tcp.h extern void tcp_v4_send_check(struct sock *sk, int len, tcp_v4_send_check 1735 net/ipv4/tcp_ipv4.c .send_check = tcp_v4_send_check, tcp_v4_send_check 1762 net/ipv6/tcp_ipv6.c .send_check = tcp_v4_send_check,