net/netrom/nr_loopback.c

   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/config.h>
  19 #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
  20 #include <linux/types.h>
  21 #include <linux/socket.h>
  22 #include <linux/timer.h>
  23 #include <net/ax25.h>
  24 #include <linux/skbuff.h>
  25 #include <net/netrom.h>
  26
  27 static struct sk_buff_head loopback_queue;
  28 static struct timer_list loopback_timer;
  29
  30 static void nr_set_loopback_timer(void);
  31
  32 void nr_loopback_init(void)
  33 {
  34         skb_queue_head_init(&loopback_queue);
  35
  36         init_timer(&loopback_timer);
  37 }
  38
  39 static int nr_loopback_running(void)
  40 {
  41         return timer_pending(&loopback_timer);
  42 }
  43
  44 int nr_loopback_queue(struct sk_buff *skb)
  45 {
  46         struct sk_buff *skbn;
  47
  48         if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
  49                 memcpy(skb_put(skbn, skb->len), skb->data, skb->len);
  50                 skbn->h.raw = skbn->data;
  51
  52                 skb_queue_tail(&loopback_queue, skbn);
  53
  54                 if (!nr_loopback_running())
  55                         nr_set_loopback_timer();
  56         }
  57
  58         kfree_skb(skb);
  59         return 1;
  60 }
  61
  62 static void nr_loopback_timer(unsigned long);
  63
  64 static void nr_set_loopback_timer(void)
  65 {
  66         del_timer(&loopback_timer);
  67
  68         loopback_timer.data     = 0;
  69         loopback_timer.function = &nr_loopback_timer;
  70         loopback_timer.expires  = jiffies + 10;
  71
  72         add_timer(&loopback_timer);
  73 }
  74
  75 static void nr_loopback_timer(unsigned long param)
  76 {
  77         struct sk_buff *skb;
  78         ax25_address *nr_dest;
  79         struct net_device *dev;
  80
  81         if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  82                 nr_dest = (ax25_address *)(skb->data + 7);
  83
  84                 dev = nr_dev_get(nr_dest);
  85
  86                 if (dev == NULL || nr_rx_frame(skb, dev) == 0)
  87                         kfree_skb(skb);
  88
  89                 if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
  90                         nr_set_loopback_timer();
  91         }
  92 }
  93
  94 #ifdef MODULE
  95
  96 void nr_loopback_clear(void)
  97 {
  98         struct sk_buff *skb;
  99
 100         del_timer(&loopback_timer);
 101
 102         while ((skb = skb_dequeue(&loopback_queue)) != NULL)
 103                 kfree_skb(skb);
 104 }
 105
 106 #endif
 107
 108 #endif