linux/net/netfilter/xt_repldata.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Today's hack: quantum tunneling in structs
 *
 * 'entries' and 'term' are never anywhere referenced by word in code. In fact,
 * they serve as the hanging-off data accessed through repl.data[].
 */

/* tbl has the following structure equivalent, but is C99 compliant:
 * struct {
 *	struct type##_replace repl;
 *	struct type##_standard entries[nhooks];
 *	struct type##_error term;
 * } *tbl;
 */

#define xt_alloc_initial_table(type, typ2) …