int sflt_data_in(struct socket *so, const struct sockaddr *from, mbuf_t *data,
mbuf_t *control, sflt_data_flag_t flags, int *filtered);
int sflt_attach_private(struct socket *so, struct socket_filter *filter, sflt_handle handle, int locked);
int sflt_data_in(struct socket *so, const struct sockaddr *from, mbuf_t *data,
mbuf_t *control, sflt_data_flag_t flags, int *filtered);
int sflt_attach_private(struct socket *so, struct socket_filter *filter, sflt_handle handle, int locked);