/usr/src/xtables-addons-2.10/extensions/xt_geoip.h is in xtables-addons-dkms 2.10-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | /* ipt_geoip.h header file for libipt_geoip.c and ipt_geoip.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright (c) 2004, 2005, 2006, 2007, 2008
 *
 * Samuel Jean
 * Nicolas Bouliane
 */
#ifndef _LINUX_NETFILTER_XT_GEOIP_H
#define _LINUX_NETFILTER_XT_GEOIP_H 1
enum {
	XT_GEOIP_SRC = 1 << 0,	/* Perform check on Source IP */
	XT_GEOIP_DST = 1 << 1,	/* Perform check on Destination IP */
	XT_GEOIP_INV = 1 << 2,	/* Negate the condition */
	XT_GEOIP_MAX = 15,	/* Maximum of countries */
};
/* Yup, an address range will be passed in with host-order */
struct geoip_subnet4 {
	__u32 begin;
	__u32 end;
};
struct geoip_subnet6 {
	struct in6_addr begin, end;
};
struct geoip_country_user {
	aligned_u64 subnets;
	__u32 count;
	__u16 cc;
};
struct geoip_country_kernel;
union geoip_country_group {
	aligned_u64 user; /* struct geoip_country_user * */
	struct geoip_country_kernel *kernel;
};
struct xt_geoip_match_info {
	__u8 flags;
	__u8 count;
	__u16 cc[XT_GEOIP_MAX];
	/* Used internally by the kernel */
	union geoip_country_group mem[XT_GEOIP_MAX];
};
#define COUNTRY(cc) ((cc) >> 8), ((cc) & 0x00FF)
#endif /* _LINUX_NETFILTER_XT_GEOIP_H */
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