rd_match
int rd_match(struct device *, void *, void *);
rd_match,
int rd_match(struct sockaddr *, struct radish_head *, struct radish **);
if (!rd_match((struct sockaddr *)snp, radish_head, &r)){
if (rd_match((struct sockaddr *)&npppd_get_ppp_by_ip_sin4, _this->rd,
if (rd_match(SA(&sin4), _this->npppd->rd, &radish)) {