/usr/include/linux/route.h is in linux-libc-dev 4.15.0-20.21.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* Global definitions for the IP router interface.
*
* Version: @(#)route.h 1.0.3 05/27/93
*
* Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
* for the purposes of compatibility only.
*
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
*
* Changes:
* Mike McLagan : Routing by source
*
* 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.
*/
#ifndef _LINUX_ROUTE_H
#define _LINUX_ROUTE_H
#include <linux/if.h>
/* This structure gets passed by the SIOCADDRT and SIOCDELRT calls. */
struct rtentry {
unsigned long rt_pad1;
struct sockaddr rt_dst; /* target address */
struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
struct sockaddr rt_genmask; /* target network mask (IP) */
unsigned short rt_flags;
short rt_pad2;
unsigned long rt_pad3;
void *rt_pad4;
short rt_metric; /* +1 for binary compatibility! */
char *rt_dev; /* forcing the device at add */
unsigned long rt_mtu; /* per route MTU/Window */
#define rt_mss rt_mtu /* Compatibility :-( */
unsigned long rt_window; /* Window clamping */
unsigned short rt_irtt; /* Initial RTT */
};
#define RTF_UP 0x0001 /* route usable */
#define RTF_GATEWAY 0x0002 /* destination is a gateway */
#define RTF_HOST 0x0004 /* host entry (net otherwise) */
#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
#define RTF_MTU 0x0040 /* specific MTU for this route */
#define RTF_MSS RTF_MTU /* Compatibility :-( */
#define RTF_WINDOW 0x0080 /* per route window clamping */
#define RTF_IRTT 0x0100 /* Initial round trip time */
#define RTF_REJECT 0x0200 /* Reject route */
/*
* <linux/ipv6_route.h> uses RTF values >= 64k
*/
#endif /* _LINUX_ROUTE_H */
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