include/net/inetpeer.h

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