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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.
*
* Definitions for the IP router.
*
* Version: @(#)route.h 1.0.4 05/27/93
*
* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Fixes:
* Alan Cox : Reformatted. Added ip_rt_local()
* Alan Cox : Support for TCP parameters.
* Alexey Kuznetsov: Major changes for new routing code.
* 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 _ROUTE_H
#define _ROUTE_H
#include <linux/config.h>
#include <net/dst.h>
#include <linux/in_route.h>
#include <linux/rtnetlink.h>
#include <linux/route.h>
#ifndef __KERNEL__
#warning This file is not supposed to be used outside of kernel.
#endif
#define RT_HASH_DIVISOR 256
/*
* Prevents LRU trashing, entries considered equivalent,
* if the difference between last use times is less then this number.
*/
#define RT_CACHE_BUBBLE_THRESHOLD (5*HZ)
#define RTO_ONLINK 0x01
#define RTO_TPROXY 0x80000000
#ifdef CONFIG_IP_TRANSPARENT_PROXY
#define RTO_CONN RTO_TPROXY
#else
#define RTO_CONN 0
#endif
struct rt_key
{
__u32 dst;
__u32 src;
int iif;
int oif;
#ifdef CONFIG_IP_ROUTE_FWMARK
__u32 fwmark;
#endif
__u8 tos;
__u8 scope;
};
struct rtable
{
union
{
struct dst_entry dst;
struct rtable *rt_next;
} u;
unsigned rt_flags;
unsigned rt_type;
__u32 rt_dst; /* Path destination */
__u32 rt_src; /* Path source */
int rt_iif;
/* Info on neighbour */
__u32 rt_gateway;
/* Cache lookup keys */
struct rt_key key;
/* Miscellaneous cached information */
__u32 rt_spec_dst; /* RFC1122 specific destination */
#ifdef CONFIG_IP_ROUTE_NAT
__u32 rt_src_map;
__u32 rt_dst_map;
#endif
};
extern struct rtable *rt_hash_table[RT_HASH_DIVISOR];
struct ip_rt_acct
{
__u32 o_bytes;
__u32 o_packets;
__u32 i_bytes;
__u32 i_packets;
};
extern struct ip_rt_acct ip_rt_acct[256];
extern void ip_rt_init(void);
extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
u32 src, u8 tos, struct device *dev);
extern void ip_rt_advice(struct rtable **rp, int advice);
extern void rt_cache_flush(int how);
extern int ip_route_output(struct rtable **, u32 dst, u32 src, u32 tos, int oif);
extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct device *devin);
extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
extern void ip_rt_update_pmtu(struct dst_entry *dst, unsigned mtu);
extern void ip_rt_send_redirect(struct sk_buff *skb);
extern unsigned inet_addr_type(u32 addr);
extern void ip_rt_multicast_event(struct in_device *);
extern int ip_rt_ioctl(unsigned int cmd, void *arg);
extern void ip_rt_get_source(u8 *src, struct rtable *rt);
extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
extern __inline__ void ip_rt_put(struct rtable * rt)
{
if (rt)
dst_release(&rt->u.dst);
}
extern __u8 ip_tos2prio[16];
extern __inline__ char rt_tos2priority(u8 tos)
{
return ip_tos2prio[IPTOS_TOS(tos)>>1];
}
extern __inline__ int ip_route_connect(struct rtable **rp, u32 dst, u32 src, u32 tos, int oif)
{
int err;
err = ip_route_output(rp, dst, src, tos, oif);
if (err || (dst && src))
return err;
dst = (*rp)->rt_dst;
src = (*rp)->rt_src;
ip_rt_put(*rp);
*rp = NULL;
return ip_route_output(rp, dst, src, tos, oif);
}
#endif /* _ROUTE_H */
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