LXR linux/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
  16struct 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
  32void                    inet_initpeers(void) __init;
  33
  34/* can be called with or without local BH being disabled */
  35struct inet_peer        *inet_getpeer(__be32 daddr, int create);
  36
  37/* can be called from BH context or outside */
  38extern void inet_putpeer(struct inet_peer *p);
  39
  40extern spinlock_t inet_peer_idlock;
  41/* can be called with or without local BH being disabled */
  42static 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 */
  54