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/slab.h>
  11#include <linux/socket.h>
  12#include <linux/timer.h>
  13#include <net/ax25.h>
  14#include <linux/skbuff.h>
  15#include <net/netrom.h>
  16#include <linux/init.h>
  17
  18static void nr_loopback_timer(unsigned long);
  19
  20static struct sk_buff_head loopback_queue;
  21static DEFINE_TIMER(loopback_timer, nr_loopback_timer, 0, 0);
  22
  23void __init nr_loopback_init(void)
  24{
  25        skb_queue_head_init(&loopback_queue);
  26}
  27
  28static inline int nr_loopback_running(void)
  29{
  30        return timer_pending(&loopback_timer);
  31}
  32
  33int nr_loopback_queue(struct sk_buff *skb)
  34{
  35        struct sk_buff *skbn;
  36
  37        if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
  38                skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);
  39                skb_reset_transport_header(skbn);
  40
  41                skb_queue_tail(&loopback_queue, skbn);
  42
  43                if (!nr_loopback_running())
  44                        mod_timer(&loopback_timer, jiffies + 10);
  45        }
  46
  47        kfree_skb(skb);
  48        return 1;
  49}
  50
  51static void nr_loopback_timer(unsigned long param)
  52{
  53        struct sk_buff *skb;
  54        ax25_address *nr_dest;
  55        struct net_device *dev;
  56
  57        if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  58                nr_dest = (ax25_address *)(skb->data + 7);
  59
  60                dev = nr_dev_get(nr_dest);
  61
  62                if (dev == NULL || nr_rx_frame(skb, dev) == 0)
  63                        kfree_skb(skb);
  64
  65                if (dev != NULL)
  66                        dev_put(dev);
  67
  68                if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
  69                        mod_timer(&loopback_timer, jiffies + 10);
  70        }
  71}
  72
  73void __exit nr_loopback_clear(void)
  74{
  75        del_timer_sync(&loopback_timer);
  76        skb_queue_purge(&loopback_queue);
  77}
  78
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