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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.
- */
- #ifdef NO_ANK_FIX
- #define RT_CACHE_DEBUG 0
- #else
- #define RT_CACHE_DEBUG 1
- #endif
-
- #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 struct dst_entry * dst_garbage_list;
- extern atomic_t dst_total;
-
- 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;
- }
- #endif
-
- #endif /* _NET_DST_H */
-