to_sockaddr_in
struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
req.dip = to_sockaddr_in(remote_addr).sin_addr.s_addr;
req.sip = to_sockaddr_in(local_addr).sin_addr.s_addr;
req.dport = to_sockaddr_in(remote_addr).sin_port;
req.sport = to_sockaddr_in(local_addr).sin_port;
if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);