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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

 *              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 <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.

#endif

#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(sk->protinfo.af_inet.tos) | sk->localroute)

struct rt_key

{

        __u32                   dst;

        __u32                   src;

        int                     iif;

        int                     oif;

#ifdef CONFIG_IP_ROUTE_FWMARK

        __u32                   fwmark;

#endif

        __u8                    tos;

        __u8                    scope;

};

struct inet_peer;

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 */

        struct inet_peer        *peer; /* long-living peer info */

#ifdef CONFIG_IP_ROUTE_NAT

        __u32                   rt_src_map;

        __u32                   rt_dst_map;

#endif

};

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;

} ____cacheline_aligned_in_smp;

extern struct ip_rt_acct *ip_rt_acct;

struct in_device;

extern void             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 rt_key *key);

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_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);

/* Deprecated: use ip_route_output_key directly */

static inline int ip_route_output(struct rtable **rp,

                                      u32 daddr, u32 saddr, u32 tos, int oif)

{

        struct rt_key key = { dst:daddr, src:saddr, oif:oif, tos:tos };

        return ip_route_output_key(rp, &key);

}

static inline void ip_rt_put(struct rtable * rt)

{

        if (rt)

                dst_release(&rt->u.dst);

}

#define IPTOS_RT_MASK   (IPTOS_TOS_MASK & ~3)

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)

{

        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);

}

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 */