linux/net/netrom/nr_loopback.c
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   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License as published by
   4 * the Free Software Foundation; either version 2 of the License, or
   5 * (at your option) any later version.
   6 *
   7 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi)
   8 */
   9#include <linux/types.h>
  10#include <linux/socket.h>
  11#include <linux/timer.h>
  12#include <net/ax25.h>
  13#include <linux/skbuff.h>
  14#include <net/netrom.h>
  15#include <linux/init.h>
  16
  17static void nr_loopback_timer(unsigned long);
  18
  19static struct sk_buff_head loopback_queue;
  20static DEFINE_TIMER(loopback_timer, nr_loopback_timer, 0, 0);
  21
  22void __init nr_loopback_init(void)
  23{
  24        skb_queue_head_init(&loopback_queue);
  25}
  26
  27static inline int nr_loopback_running(void)
  28{
  29        return timer_pending(&loopback_timer);
  30}
  31
  32int nr_loopback_queue(struct sk_buff *skb)
  33{
  34        struct sk_buff *skbn;
  35
  36        if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
  37                skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);
  38                skb_reset_transport_header(skbn);
  39
  40                skb_queue_tail(&loopback_queue, skbn);
  41
  42                if (!nr_loopback_running())
  43                        mod_timer(&loopback_timer, jiffies + 10);
  44        }
  45
  46        kfree_skb(skb);
  47        return 1;
  48}
  49
  50static void nr_loopback_timer(unsigned long param)
  51{
  52        struct sk_buff *skb;
  53        ax25_address *nr_dest;
  54        struct net_device *dev;
  55
  56        if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  57                nr_dest = (ax25_address *)(skb->data + 7);
  58
  59                dev = nr_dev_get(nr_dest);
  60
  61                if (dev == NULL || nr_rx_frame(skb, dev) == 0)
  62                        kfree_skb(skb);
  63
  64                if (dev != NULL)
  65                        dev_put(dev);
  66
  67                if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
  68                        mod_timer(&loopback_timer, jiffies + 10);
  69        }
  70}
  71
  72void __exit nr_loopback_clear(void)
  73{
  74        del_timer_sync(&loopback_timer);
  75        skb_queue_purge(&loopback_queue);
  76}
  77