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-rw-r--r--include/net/inetpeer.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
new file mode 100644
index 00000000000..7fda471002b
--- /dev/null
+++ b/include/net/inetpeer.h
@@ -0,0 +1,66 @@
+/*
+ * INETPEER - A storage for permanent information about peers
+ *
+ * Version: $Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 davem Exp $
+ *
+ * Authors: Andrey V. Savochkin <saw@msu.ru>
+ */
+
+#ifndef _NET_INETPEER_H
+#define _NET_INETPEER_H
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+
+struct inet_peer
+{
+ struct inet_peer *avl_left, *avl_right;
+ struct inet_peer *unused_next, **unused_prevp;
+ unsigned long dtime; /* the time of last use of not
+ * referenced entries */
+ atomic_t refcnt;
+ __u32 v4daddr; /* peer's address */
+ __u16 avl_height;
+ __u16 ip_id_count; /* IP ID for the next packet */
+ __u32 tcp_ts;
+ unsigned long tcp_ts_stamp;
+};
+
+void inet_initpeers(void) __init;
+
+/* can be called with or without local BH being disabled */
+struct inet_peer *inet_getpeer(__u32 daddr, int create);
+
+extern spinlock_t inet_peer_unused_lock;
+extern struct inet_peer **inet_peer_unused_tailp;
+/* can be called from BH context or outside */
+static inline void inet_putpeer(struct inet_peer *p)
+{
+ spin_lock_bh(&inet_peer_unused_lock);
+ if (atomic_dec_and_test(&p->refcnt)) {
+ p->unused_prevp = inet_peer_unused_tailp;
+ p->unused_next = NULL;
+ *inet_peer_unused_tailp = p;
+ inet_peer_unused_tailp = &p->unused_next;
+ p->dtime = jiffies;
+ }
+ spin_unlock_bh(&inet_peer_unused_lock);
+}
+
+extern spinlock_t inet_peer_idlock;
+/* can be called with or without local BH being disabled */
+static inline __u16 inet_getid(struct inet_peer *p, int more)
+{
+ __u16 id;
+
+ spin_lock_bh(&inet_peer_idlock);
+ id = p->ip_id_count;
+ p->ip_id_count += 1 + more;
+ spin_unlock_bh(&inet_peer_idlock);
+ return id;
+}
+
+#endif /* _NET_INETPEER_H */