LXR linux-old/net/netrom/nr

   1/*
   2 *      NET/ROM release 007
   3 *
   4 *      This code REQUIRES 2.1.15 or higher/ NET3.038
   5 *
   6 *      This module:
   7 *              This module is free software; you can redistribute it and/or
   8 *              modify it under the terms of the GNU General Public License
   9 *              as published by the Free Software Foundation; either version
  10 *              2 of the License, or (at your option) any later version.
  11 *
  12 *      History
  13 *      NET/ROM 007     Tomi(OH2BNS)    Created this file.
  14 *                                      Small change in nr_loopback_queue().
  15 *
  16 */
  17
  18#include <linux/types.h>
  19#include <linux/socket.h>
  20#include <linux/timer.h>
  21#include <net/ax25.h>
  22#include <linux/skbuff.h>
  23#include <net/netrom.h>
  24#include <linux/init.h>
  25
  26static struct sk_buff_head loopback_queue;
  27static struct timer_list loopback_timer;
  28
  29static void nr_set_loopback_timer(void);
  30
  31void nr_loopback_init(void)
  32{
  33        skb_queue_head_init(&loopback_queue);
  34
  35        init_timer(&loopback_timer);
  36}
  37
  38static int nr_loopback_running(void)
  39{
  40        return timer_pending(&loopback_timer);
  41}
  42
  43int nr_loopback_queue(struct sk_buff *skb)
  44{
  45        struct sk_buff *skbn;
  46
  47        if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
  48                memcpy(skb_put(skbn, skb->len), skb->data, skb->len);
  49                skbn->h.raw = skbn->data;
  50
  51                skb_queue_tail(&loopback_queue, skbn);
  52
  53                if (!nr_loopback_running())
  54                        nr_set_loopback_timer();
  55        }
  56
  57        kfree_skb(skb);
  58        return 1;
  59}
  60
  61static void nr_loopback_timer(unsigned long);
  62
  63static void nr_set_loopback_timer(void)
  64{
  65        del_timer(&loopback_timer);
  66
  67        loopback_timer.data     = 0;
  68        loopback_timer.function = &nr_loopback_timer;
  69        loopback_timer.expires  = jiffies + 10;
  70
  71        add_timer(&loopback_timer);
  72}
  73
  74static void nr_loopback_timer(unsigned long param)
  75{
  76        struct sk_buff *skb;
  77        ax25_address *nr_dest;
  78        struct net_device *dev;
  79
  80        if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  81                nr_dest = (ax25_address *)(skb->data + 7);
  82
  83                dev = nr_dev_get(nr_dest);
  84
  85                if (dev == NULL || nr_rx_frame(skb, dev) == 0)
  86                        kfree_skb(skb);
  87
  88                if (dev != NULL)
  89                        dev_put(dev);
  90
  91                if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
  92                        nr_set_loopback_timer();
  93        }
  94}
  95
  96void __exit nr_loopback_clear(void)
  97{
  98        del_timer(&loopback_timer);
  99        skb_queue_purge(&loopback_queue);
 100}
 101