prefix_match
if (((prefix_match &&
(!prefix_match &&
bool prefix_match = false;
prefix_match = true;
if (prefix_match(ln->datum, path))
if (prefix_match(&p->match, sa1) && prefix_match(&p->dest, sa2))
extern int prefix_match(const struct prefix *, const struct sockaddr *);
int prefix_match(struct in6_addr *, int, struct in6_addr *, int);