CHAIN_TO_VI
vi = CHAIN_TO_VI(ch);
vi = CHAIN_TO_VI(ch);
ipfw_objhash_bitmap_merge(CHAIN_TO_VI(ch), &new_idx, &new_blocks);
ipfw_objhash_bitmap_swap(CHAIN_TO_VI(ch), &new_idx, &new_blocks);
unref_table_value(CHAIN_TO_VI(ch),
vi = CHAIN_TO_VI(ch);
ipfw_objhash_foreach(CHAIN_TO_VI(ch), destroy_value, ch);
ipfw_objhash_destroy(CHAIN_TO_VI(ch));