Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 178 insertions, 0 deletions

diff --git a/pfinet/linux-src/include/net/dst.h b/pfinet/linux-src/include/net/dst.h
new file mode 100644
index 00000000..baf4f414
--- /dev/null
+++ b/pfinet/linux-src/include/net/dst.h
@@ -0,0 +1,178 @@
+/*
+ * 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 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 */