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         /* group together avl_left,avl_right,v4daddr to speedup lookups */
  18         struct inet_peer        *avl_left, *avl_right;
  19         __be32                  v4daddr;        /* peer's address */
  20         __u32                   avl_height;
  21         struct list_head        unused;
  22         __u32                   dtime;          /* the time of last use of not
  23                                                  * referenced entries */
  24         atomic_t                refcnt;
  25         atomic_t                rid;            /* Frag reception counter */
  26         atomic_t                ip_id_count;    /* IP ID for the next packet */
  27         __u32                   tcp_ts;
  28         __u32                   tcp_ts_stamp;
  29 };
  30
  31 void                    inet_initpeers(void) __init;
  32
  33 /* can be called with or without local BH being disabled */
  34 struct inet_peer        *inet_getpeer(__be32 daddr, int create);
  35
  36 /* can be called from BH context or outside */
  37 extern void inet_putpeer(struct inet_peer *p);
  38
  39 /* can be called with or without local BH being disabled */
  40 static inline __u16     inet_getid(struct inet_peer *p, int more)
  41 {
  42         more++;
  43         return atomic_add_return(more, &p->ip_id_count) - more;
  44 }
  45
  46 #endif /* _NET_INETPEER_H */