#ifndef _NET_DST_H
#define _NET_DST_H
+#include <net/dst_ops.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/rcupdate.h>
struct sk_buff;
-struct dst_entry
-{
+struct dst_entry {
struct rcu_head rcu_head;
struct dst_entry *child;
struct net_device *dev;
* (L1_CACHE_SIZE would be too much)
*/
#ifdef CONFIG_64BIT
- long __pad_to_align_refcnt[2];
-#else
long __pad_to_align_refcnt[1];
#endif
/*
};
};
-
-struct dst_ops
-{
- unsigned short family;
- __be16 protocol;
- unsigned gc_thresh;
-
- int (*gc)(struct dst_ops *ops);
- struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
- void (*destroy)(struct dst_entry *);
- void (*ifdown)(struct dst_entry *,
- struct net_device *dev, int how);
- struct dst_entry * (*negative_advice)(struct dst_entry *);
- void (*link_failure)(struct sk_buff *);
- void (*update_pmtu)(struct dst_entry *dst, u32 mtu);
- int (*local_out)(struct sk_buff *skb);
-
- atomic_t entries;
- struct kmem_cache *kmem_cachep;
- struct net *dst_net;
-};
-
#ifdef __KERNEL__
static inline u32
return dst->metrics[metric-1];
}
+static inline u32
+dst_feature(const struct dst_entry *dst, u32 feature)
+{
+ return dst_metric(dst, RTAX_FEATURES) & feature;
+}
+
static inline u32 dst_mtu(const struct dst_entry *dst)
{
u32 mtu = dst_metric(dst, RTAX_MTU);
static inline u32
dst_allfrag(const struct dst_entry *dst)
{
- int ret = dst_metric(dst, RTAX_FEATURES) & RTAX_FEATURE_ALLFRAG;
+ int ret = dst_feature(dst, RTAX_FEATURE_ALLFRAG);
/* Yes, _exactly_. This is paranoia. */
barrier();
return ret;
dst->lastuse = time;
}
+static inline void dst_use_noref(struct dst_entry *dst, unsigned long time)
+{
+ dst->__use++;
+ dst->lastuse = time;
+}
+
static inline
struct dst_entry * dst_clone(struct dst_entry * dst)
{
extern void dst_release(struct dst_entry *dst);
+static inline void refdst_drop(unsigned long refdst)
+{
+ if (!(refdst & SKB_DST_NOREF))
+ dst_release((struct dst_entry *)(refdst & SKB_DST_PTRMASK));
+}
+
+/**
+ * skb_dst_drop - drops skb dst
+ * @skb: buffer
+ *
+ * Drops dst reference count if a reference was taken.
+ */
+static inline void skb_dst_drop(struct sk_buff *skb)
+{
+ if (skb->_skb_refdst) {
+ refdst_drop(skb->_skb_refdst);
+ skb->_skb_refdst = 0UL;
+ }
+}
+
+static inline void skb_dst_copy(struct sk_buff *nskb, const struct sk_buff *oskb)
+{
+ nskb->_skb_refdst = oskb->_skb_refdst;
+ if (!(nskb->_skb_refdst & SKB_DST_NOREF))
+ dst_clone(skb_dst(nskb));
+}
+
+/**
+ * skb_dst_force - makes sure skb dst is refcounted
+ * @skb: buffer
+ *
+ * If dst is not yet refcounted, let's do it
+ */
+static inline void skb_dst_force(struct sk_buff *skb)
+{
+ if (skb_dst_is_noref(skb)) {
+ WARN_ON(!rcu_read_lock_held());
+ skb->_skb_refdst &= ~SKB_DST_NOREF;
+ dst_clone(skb_dst(skb));
+ }
+}
+
+
+/**
+ * skb_tunnel_rx - prepare skb for rx reinsert
+ * @skb: buffer
+ * @dev: tunnel device
+ *
+ * After decapsulation, packet is going to re-enter (netif_rx()) our stack,
+ * so make some cleanups, and perform accounting.
+ */
+static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev)
+{
+ skb->dev = dev;
+ /* TODO : stats should be SMP safe */
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += skb->len;
+ skb->rxhash = 0;
+ skb_dst_drop(skb);
+ nf_reset(skb);
+}
+
/* Children define the path of the packet through the
* Linux networking. Thus, destinations are stackable.
*/
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;
+ struct dst_entry *dst = skb_dst(skb);
if (dst && dst->ops && dst->ops->link_failure)
dst->ops->link_failure(skb);
}
/* Output packet to network from transport. */
static inline int dst_output(struct sk_buff *skb)
{
- return skb->dst->output(skb);
+ return skb_dst(skb)->output(skb);
}
/* Input packet from network to transport. */
static inline int dst_input(struct sk_buff *skb)
{
- return skb->dst->input(skb);
+ return skb_dst(skb)->input(skb);
}
static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)