hash_f
int hash_f(unsigned char *out, const unsigned char *in, const unsigned char *pub_seed, uint32_t addr[8], const unsigned int n);
hash_f(out, out, pub_seed, addr, params->n);
objhash_hash_f *hash_f;
ni->hash_f = objhash_hash_name;
ipfw_objhash_set_funcs(struct namedobj_instance *ni, objhash_hash_f *hash_f,
ni->hash_f = hash_f;
hash = ni->hash_f(ni, name, set) % ni->nn_size;
hash = ni->hash_f(ni, name, set) % ni->nn_size;
hash = ni->hash_f(ni, no->name, no->set) % ni->nn_size;
hash = ni->hash_f(ni, no->name, no->set) % ni->nn_size;