/usr/include/netlink/route/rtnl.h is in libnl2-dev 2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* netlink/route/rtnl.h Routing Netlink
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
*/
#ifndef NETLINK_RTNL_H_
#define NETLINK_RTNL_H_
#include <netlink/netlink.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @name Realms
* @{
*/
/**
* Mask specying the size of each realm part
* @ingroup rtnl
*/
#define RTNL_REALM_MASK (0xFFFF)
/**
* Extract FROM realm from a realms field
*/
#define RTNL_REALM_FROM(realm) ((realm) >> 16)
/**
* Extract TO realm from a realms field
*/
#define RTNL_REALM_TO(realm) ((realm) & RTNL_REALM_MASK)
/**
* Build a realms field
*/
#define RTNL_MAKE_REALM(from, to) \
((RTNL_REALM_TO(from) << 16) & RTNL_REALM_TO(to))
/** @} */
/* General */
extern int nl_rtgen_request(struct nl_sock *, int, int, int);
/* Routing Type Translations */
extern char * nl_rtntype2str(int, char *, size_t);
extern int nl_str2rtntype(const char *);
/* Scope Translations */
extern char * rtnl_scope2str(int, char *, size_t);
extern int rtnl_str2scope(const char *);
/* Realms Translations */
extern char * rtnl_realms2str(uint32_t, char *, size_t);
#ifdef __cplusplus
}
#endif
#endif
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