struct rcu_head rcu_head;
struct dst_entry *child;
struct net_device *dev;
- short error;
- short obsolete;
- int flags;
-#define DST_HOST 0x0001
-#define DST_NOXFRM 0x0002
-#define DST_NOPOLICY 0x0004
-#define DST_NOHASH 0x0008
-#define DST_NOCACHE 0x0010
+ struct dst_ops *ops;
+ unsigned long _metrics;
unsigned long expires;
-
- unsigned short header_len; /* more space at head required */
- unsigned short trailer_len; /* space to reserve at tail */
-
- unsigned int rate_tokens;
- unsigned long rate_last; /* rate limiting for ICMP */
-
struct dst_entry *path;
-
struct neighbour *neighbour;
struct hh_cache *hh;
#ifdef CONFIG_XFRM
int (*input)(struct sk_buff*);
int (*output)(struct sk_buff*);
- struct dst_ops *ops;
-
- u32 metrics[RTAX_MAX];
-
-#ifdef CONFIG_NET_CLS_ROUTE
+ short error;
+ short obsolete;
+ unsigned short header_len; /* more space at head required */
+ unsigned short trailer_len; /* space to reserve at tail */
+#ifdef CONFIG_IP_ROUTE_CLASSID
__u32 tclassid;
#else
__u32 __pad2;
#endif
-
/*
* Align __refcnt to a 64 bytes alignment
* (L1_CACHE_SIZE would be too much)
atomic_t __refcnt; /* client references */
int __use;
unsigned long lastuse;
+ int flags;
+#define DST_HOST 0x0001
+#define DST_NOXFRM 0x0002
+#define DST_NOPOLICY 0x0004
+#define DST_NOHASH 0x0008
+#define DST_NOCACHE 0x0010
union {
- struct dst_entry *next;
- struct rtable __rcu *rt_next;
- struct rt6_info *rt6_next;
- struct dn_route *dn_next;
+ struct dst_entry *next;
+ struct rtable __rcu *rt_next;
+ struct rt6_info *rt6_next;
+ struct dn_route __rcu *dn_next;
};
};
#ifdef __KERNEL__
+extern u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old);
+extern const u32 dst_default_metrics[RTAX_MAX];
+
+#define DST_METRICS_READ_ONLY 0x1UL
+#define __DST_METRICS_PTR(Y) \
+ ((u32 *)((Y) & ~DST_METRICS_READ_ONLY))
+#define DST_METRICS_PTR(X) __DST_METRICS_PTR((X)->_metrics)
+
+static inline bool dst_metrics_read_only(const struct dst_entry *dst)
+{
+ return dst->_metrics & DST_METRICS_READ_ONLY;
+}
+
+extern void __dst_destroy_metrics_generic(struct dst_entry *dst, unsigned long old);
+
+static inline void dst_destroy_metrics_generic(struct dst_entry *dst)
+{
+ unsigned long val = dst->_metrics;
+ if (!(val & DST_METRICS_READ_ONLY))
+ __dst_destroy_metrics_generic(dst, val);
+}
+
+static inline u32 *dst_metrics_write_ptr(struct dst_entry *dst)
+{
+ unsigned long p = dst->_metrics;
+
+ if (p & DST_METRICS_READ_ONLY)
+ return dst->ops->cow_metrics(dst, p);
+ return __DST_METRICS_PTR(p);
+}
+
+/* This may only be invoked before the entry has reached global
+ * visibility.
+ */
+static inline void dst_init_metrics(struct dst_entry *dst,
+ const u32 *src_metrics,
+ bool read_only)
+{
+ dst->_metrics = ((unsigned long) src_metrics) |
+ (read_only ? DST_METRICS_READ_ONLY : 0);
+}
+
+static inline void dst_copy_metrics(struct dst_entry *dest, const struct dst_entry *src)
+{
+ u32 *dst_metrics = dst_metrics_write_ptr(dest);
+
+ if (dst_metrics) {
+ u32 *src_metrics = DST_METRICS_PTR(src);
+
+ memcpy(dst_metrics, src_metrics, RTAX_MAX * sizeof(u32));
+ }
+}
+
+static inline u32 *dst_metrics_ptr(struct dst_entry *dst)
+{
+ return DST_METRICS_PTR(dst);
+}
+
static inline u32
-dst_metric(const struct dst_entry *dst, int metric)
+dst_metric_raw(const struct dst_entry *dst, const int metric)
{
- return dst->metrics[metric-1];
+ u32 *p = DST_METRICS_PTR(dst);
+
+ return p[metric-1];
+}
+
+static inline u32
+dst_metric(const struct dst_entry *dst, const int metric)
+{
+ WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
+ metric == RTAX_ADVMSS ||
+ metric == RTAX_MTU);
+ return dst_metric_raw(dst, metric);
+}
+
+static inline u32
+dst_metric_advmss(const struct dst_entry *dst)
+{
+ u32 advmss = dst_metric_raw(dst, RTAX_ADVMSS);
+
+ if (!advmss)
+ advmss = dst->ops->default_advmss(dst);
+
+ return advmss;
+}
+
+static inline void dst_metric_set(struct dst_entry *dst, int metric, u32 val)
+{
+ u32 *p = dst_metrics_write_ptr(dst);
+
+ if (p)
+ p[metric-1] = val;
}
static inline u32
static inline u32 dst_mtu(const struct dst_entry *dst)
{
- u32 mtu = dst_metric(dst, RTAX_MTU);
- /*
- * Alexey put it here, so ask him about it :)
- */
- barrier();
+ u32 mtu = dst_metric_raw(dst, RTAX_MTU);
+
+ if (!mtu)
+ mtu = dst->ops->default_mtu(dst);
+
return mtu;
}
static inline void set_dst_metric_rtt(struct dst_entry *dst, int metric,
unsigned long rtt)
{
- dst->metrics[metric-1] = jiffies_to_msecs(rtt);
+ dst_metric_set(dst, metric, jiffies_to_msecs(rtt));
}
static inline u32
dst_allfrag(const struct dst_entry *dst)
{
int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
- /* Yes, _exactly_. This is paranoia. */
- barrier();
return ret;
}
static inline int
-dst_metric_locked(struct dst_entry *dst, int metric)
+dst_metric_locked(const struct dst_entry *dst, int metric)
{
return dst_metric(dst, RTAX_LOCK) & (1<<metric);
}
}
extern int dst_discard(struct sk_buff *skb);
-extern void * dst_alloc(struct dst_ops * ops);
+extern void *dst_alloc(struct dst_ops * ops, int initial_ref);
extern void __dst_free(struct dst_entry * dst);
extern struct dst_entry *dst_destroy(struct dst_entry * dst);
struct flowi;
#ifndef CONFIG_XFRM
static inline int xfrm_lookup(struct net *net, struct dst_entry **dst_p,
- struct flowi *fl, struct sock *sk, int flags)
+ const struct flowi *fl, struct sock *sk,
+ int flags)
{
return 0;
}
static inline int __xfrm_lookup(struct net *net, struct dst_entry **dst_p,
- struct flowi *fl, struct sock *sk, int flags)
+ const struct flowi *fl, struct sock *sk,
+ int flags)
{
return 0;
}
#else
extern int xfrm_lookup(struct net *net, struct dst_entry **dst_p,
- struct flowi *fl, struct sock *sk, int flags);
+ const struct flowi *fl, struct sock *sk, int flags);
extern int __xfrm_lookup(struct net *net, struct dst_entry **dst_p,
- struct flowi *fl, struct sock *sk, int flags);
+ const struct flowi *fl, struct sock *sk, int flags);
#endif
#endif
projects / cascardo / linux.git / blobdiff