1 files changed, 66 insertions, 0 deletions

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
new file mode 100644
index 000000000000..7fda471002b6
--- /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 */