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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
* 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
* Robert Olsson : Added rt_cache statistics
* 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 <net/inetpeer.h>
#include <net/flow.h>
#include <linux/in_route.h>
#include <linux/rtnetlink.h>
#include <linux/route.h>
#include <linux/ip.h>
#include <linux/cache.h>
#ifndef __KERNEL__
#warning This file is not supposed to be used outside of kernel.
#define RTO_ONLINK 0x01
#define RTO_CONN 0
/* RTO_CONN is not used (being alias for 0), but preserved not to break
* some modules referring to it. */
#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
struct fib_nh;
struct inet_peer;
struct rtable
struct dst_entry dst;
struct rtable *rt_next;
} u;
struct in_device *idev;
unsigned rt_flags;
__u16 rt_type;
__u16 rt_multipath_alg;
__u32 rt_dst; /* Path destination */
__u32 rt_src; /* Path source */
int rt_iif;
/* Info on neighbour */
__u32 rt_gateway;
/* Cache lookup keys */
struct flowi fl;
/* Miscellaneous cached information */
__u32 rt_spec_dst; /* RFC1122 specific destination */
struct inet_peer *peer; /* long-living peer info */
struct ip_rt_acct
__u32 o_bytes;
__u32 o_packets;
__u32 i_bytes;
__u32 i_packets;
struct rt_cache_stat
unsigned int in_hit;
unsigned int in_slow_tot;
unsigned int in_slow_mc;
unsigned int in_no_route;
unsigned int in_brd;
unsigned int in_martian_dst;
unsigned int in_martian_src;
unsigned int out_hit;
unsigned int out_slow_tot;
unsigned int out_slow_mc;
unsigned int gc_total;
unsigned int gc_ignored;
unsigned int gc_goal_miss;
unsigned int gc_dst_overflow;
unsigned int in_hlist_search;
unsigned int out_hlist_search;
extern struct rt_cache_stat *rt_cache_stat;
#define RT_CACHE_STAT_INC(field) \
(per_cpu_ptr(rt_cache_stat, _smp_processor_id())->field++)
extern struct ip_rt_acct *ip_rt_acct;
struct in_device;
extern int ip_rt_init(void);
extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw,
u32 src, u8 tos, struct net_device *dev);
extern void ip_rt_advice(struct rtable **rp, int advice);
extern void rt_cache_flush(int how);
extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
extern int ip_route_output_key(struct rtable **, struct flowi *flp);
extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct net_device *devin);
extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_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 __user *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);
static inline void ip_rt_put(struct rtable * rt)
if (rt)
extern __u8 ip_tos2prio[16];
static inline char rt_tos2priority(u8 tos)
return ip_tos2prio[IPTOS_TOS(tos)>>1];
static inline int ip_route_connect(struct rtable **rp, u32 dst,
u32 src, u32 tos, int oif, u8 protocol,
u16 sport, u16 dport, struct sock *sk)
struct flowi fl = { .oif = oif,
.nl_u = { .ip4_u = { .daddr = dst,
.saddr = src,
.tos = tos } },
.proto = protocol,
.uli_u = { .ports =
{ .sport = sport,
.dport = dport } } };
int err;
if (!dst || !src) {
err = __ip_route_output_key(rp, &fl);
if (err)
return err;
fl.fl4_dst = (*rp)->rt_dst;
fl.fl4_src = (*rp)->rt_src;
*rp = NULL;
return ip_route_output_flow(rp, &fl, sk, 0);
static inline int ip_route_newports(struct rtable **rp, u16 sport, u16 dport,
struct sock *sk)
if (sport != (*rp)->fl.fl_ip_sport ||
dport != (*rp)->fl.fl_ip_dport) {
struct flowi fl;
memcpy(&fl, &(*rp)->fl, sizeof(fl));
fl.fl_ip_sport = sport;
fl.fl_ip_dport = dport;
*rp = NULL;
return ip_route_output_flow(rp, &fl, sk, 0);
return 0;
extern void rt_bind_peer(struct rtable *rt, int create);
static inline struct inet_peer *rt_get_peer(struct rtable *rt)
if (rt->peer)
return rt->peer;
rt_bind_peer(rt, 0);
return rt->peer;
#endif /* _ROUTE_H */