/usr/include/libiptc/ipt_kernel_headers.h is in iptables-dev 1.4.21-1ubuntu1.
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 | /* 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>
#if defined(__GLIBC__) && __GLIBC__ == 2
#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>
#else /* libc5 */
#include <sys/socket.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/icmp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/types.h>
#include <linux/in6.h>
#endif
#endif
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