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/*
* net/dst.h Protocol independent destination cache definitions.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#ifndef _NET_DST_H
#define _NET_DST_H
#include <linux/config.h>
#include <net/neighbour.h>
/*
* 0 - no debugging messages
* 1 - rare events and bugs (default)
* 2 - trace mode.
*/
#define RT_CACHE_DEBUG 0
#define DST_GC_MIN (1*HZ)
#define DST_GC_INC (5*HZ)
#define DST_GC_MAX (120*HZ)
struct sk_buff;
struct dst_entry
{
struct dst_entry *next;
atomic_t refcnt; /* tree/hash references */
atomic_t use; /* client references */
struct device *dev;
int obsolete;
unsigned long lastuse;
unsigned long expires;
unsigned mxlock;
unsigned pmtu;
unsigned window;
unsigned rtt;
unsigned long rate_last; /* rate limiting for ICMP */
unsigned long rate_tokens;
int error;
struct neighbour *neighbour;
struct hh_cache *hh;
int (*input)(struct sk_buff*);
int (*output)(struct sk_buff*);
#ifdef CONFIG_NET_CLS_ROUTE
__u32 tclassid;
#endif
struct dst_ops *ops;
char info[0];
};
struct dst_ops
{
unsigned short family;
unsigned short protocol;
unsigned gc_thresh;
int (*gc)(void);
struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
struct dst_entry * (*reroute)(struct dst_entry *,
struct sk_buff *);
void (*destroy)(struct dst_entry *);
struct dst_entry * (*negative_advice)(struct dst_entry *);
void (*link_failure)(struct sk_buff *);
atomic_t entries;
};
#ifdef __KERNEL__
extern __inline__
struct dst_entry * dst_clone(struct dst_entry * dst)
{
if (dst)
atomic_inc(&dst->use);
return dst;
}
extern __inline__
void dst_release(struct dst_entry * dst)
{
if (dst)
atomic_dec(&dst->use);
}
/* The following primitive should be use if and only if
destination entry has just been removed from a location
accessed directly by hard irq.
*/
extern __inline__
void dst_release_irqwait(struct dst_entry * dst)
{
if (dst) {
synchronize_irq();
atomic_dec(&dst->use);
}
}
extern __inline__
struct dst_entry * dst_check(struct dst_entry ** dst_p, u32 cookie)
{
struct dst_entry * dst = *dst_p;
if (dst && dst->obsolete)
dst = dst->ops->check(dst, cookie);
return (*dst_p = dst);
}
extern __inline__
struct dst_entry * dst_reroute(struct dst_entry ** dst_p, struct sk_buff *skb)
{
struct dst_entry * dst = *dst_p;
if (dst && dst->obsolete)
dst = dst->ops->reroute(dst, skb);
return (*dst_p = dst);
}
extern void * dst_alloc(int size, struct dst_ops * ops);
extern void __dst_free(struct dst_entry * dst);
extern void dst_destroy(struct dst_entry * dst);
extern __inline__
void dst_free(struct dst_entry * dst)
{
if (dst->obsolete > 1)
return;
if (!atomic_read(&dst->use)) {
dst_destroy(dst);
return;
}
__dst_free(dst);
}
extern __inline__ void dst_confirm(struct dst_entry *dst)
{
if (dst)
neigh_confirm(dst->neighbour);
}
extern __inline__ void dst_negative_advice(struct dst_entry **dst_p)
{
struct dst_entry * dst = *dst_p;
if (dst && dst->ops->negative_advice)
*dst_p = dst->ops->negative_advice(dst);
}
extern __inline__ void dst_link_failure(struct sk_buff *skb)
{
struct dst_entry * dst = skb->dst;
if (dst && dst->ops && dst->ops->link_failure)
dst->ops->link_failure(skb);
}
extern __inline__ void dst_set_expires(struct dst_entry *dst, int timeout)
{
unsigned long expires = jiffies + timeout;
if (expires == 0)
expires = 1;
if (dst->expires == 0 || (long)(dst->expires - expires) > 0)
dst->expires = expires;
}
extern void dst_init(void);
#endif
#endif /* _NET_DST_H */
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