This file is indexed.

/usr/include/libiptc/ipt_kernel_headers.h is in iptables-dev 1.6.0-2ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* This is the userspace/kernel interface for Generic IP Chains,
   required for libc6. */
#ifndef _FWCHAINS_KERNEL_HEADERS_H
#define _FWCHAINS_KERNEL_HEADERS_H

#include <limits.h>

#include <netinet/ip.h>
#include <netinet/in.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <net/if.h>
#include <sys/types.h>
#endif