include/net/inetpeer.h

   1 /*
   2  *              INETPEER - A storage for permanent information about peers
   3  *
   4  *  Version:    $Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 davem Exp $
   5  *
   6  *  Authors:    Andrey V. Savochkin <saw@msu.ru>
   7  */
   8
   9 #ifndef _NET_INETPEER_H
  10 #define _NET_INETPEER_H
  11
  12 #include <linux/types.h>
  13 #include <linux/init.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/spinlock.h>
  16 #include <asm/atomic.h>
  17
  18 struct inet_peer
  19 {
  20         /* group together avl_left,avl_right,v4daddr to speedup lookups */
  21         struct inet_peer        *avl_left, *avl_right;
  22         __be32                  v4daddr;        /* peer's address */
  23         __u16                   avl_height;
  24         __u16                   ip_id_count;    /* IP ID for the next packet */
  25         struct inet_peer        *unused_next, **unused_prevp;
  26         __u32                   dtime;          /* the time of last use of not
  27                                                  * referenced entries */
  28         atomic_t                refcnt;
  29         atomic_t                rid;            /* Frag reception counter */
  30         __u32                   tcp_ts;
  31         unsigned long           tcp_ts_stamp;
  32 };
  33
  34 void                    inet_initpeers(void) __init;
  35
  36 /* can be called with or without local BH being disabled */
  37 struct inet_peer        *inet_getpeer(__be32 daddr, int create);
  38
  39 /* can be called from BH context or outside */
  40 extern void inet_putpeer(struct inet_peer *p);
  41
  42 extern spinlock_t inet_peer_idlock;
  43 /* can be called with or without local BH being disabled */
  44 static inline __u16     inet_getid(struct inet_peer *p, int more)
  45 {
  46         __u16 id;
  47
  48         spin_lock_bh(&inet_peer_idlock);
  49         id = p->ip_id_count;
  50         p->ip_id_count += 1 + more;
  51         spin_unlock_bh(&inet_peer_idlock);
  52         return id;
  53 }
  54
  55 #endif /* _NET_INETPEER_H */