| /* |
| * 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 (HZ/10) |
| #define DST_GC_INC (HZ/2) |
| #define DST_GC_MAX (120*HZ) |
| |
| struct sk_buff; |
| |
| struct dst_entry |
| { |
| struct dst_entry *next; |
| atomic_t __refcnt; /* client references */ |
| int __use; |
| struct net_device *dev; |
| int obsolete; |
| int flags; |
| #define DST_HOST 1 |
| unsigned long lastuse; |
| unsigned long expires; |
| |
| unsigned mxlock; |
| unsigned pmtu; |
| unsigned window; |
| unsigned rtt; |
| unsigned rttvar; |
| unsigned ssthresh; |
| unsigned cwnd; |
| unsigned advmss; |
| unsigned reordering; |
| |
| 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 *); |
| int entry_size; |
| |
| atomic_t entries; |
| kmem_cache_t *kmem_cachep; |
| }; |
| |
| #ifdef __KERNEL__ |
| |
| static inline void dst_hold(struct dst_entry * dst) |
| { |
| atomic_inc(&dst->__refcnt); |
| } |
| |
| static inline |
| struct dst_entry * dst_clone(struct dst_entry * dst) |
| { |
| if (dst) |
| atomic_inc(&dst->__refcnt); |
| return dst; |
| } |
| |
| static inline |
| void dst_release(struct dst_entry * dst) |
| { |
| if (dst) { |
| smp_mb__before_atomic_dec(); |
| atomic_dec(&dst->__refcnt); |
| } |
| } |
| |
| extern void * dst_alloc(struct dst_ops * ops); |
| extern void __dst_free(struct dst_entry * dst); |
| extern void dst_destroy(struct dst_entry * dst); |
| |
| static inline |
| void dst_free(struct dst_entry * dst) |
| { |
| if (dst->obsolete > 1) |
| return; |
| if (!atomic_read(&dst->__refcnt)) { |
| dst_destroy(dst); |
| return; |
| } |
| __dst_free(dst); |
| } |
| |
| static inline void dst_confirm(struct dst_entry *dst) |
| { |
| if (dst) |
| neigh_confirm(dst->neighbour); |
| } |
| |
| static 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); |
| } |
| |
| static 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); |
| } |
| |
| static 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 */ |