LXR linux/net/rose/rose

   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 (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   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/rose.h>
  15#include <linux/init.h>
  16
  17static struct sk_buff_head loopback_queue;
  18static struct timer_list loopback_timer;
  19
  20static void rose_set_loopback_timer(void);
  21
  22void rose_loopback_init(void)
  23{
  24        skb_queue_head_init(&loopback_queue);
  25
  26        init_timer(&loopback_timer);
  27}
  28
  29static int rose_loopback_running(void)
  30{
  31        return timer_pending(&loopback_timer);
  32}
  33
  34int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
  35{
  36        struct sk_buff *skbn;
  37
  38        skbn = skb_clone(skb, GFP_ATOMIC);
  39
  40        kfree_skb(skb);
  41
  42        if (skbn != NULL) {
  43                skb_queue_tail(&loopback_queue, skbn);
  44
  45                if (!rose_loopback_running())
  46                        rose_set_loopback_timer();
  47        }
  48
  49        return 1;
  50}
  51
  52static void rose_loopback_timer(unsigned long);
  53
  54static void rose_set_loopback_timer(void)
  55{
  56        del_timer(&loopback_timer);
  57
  58        loopback_timer.data     = 0;
  59        loopback_timer.function = &rose_loopback_timer;
  60        loopback_timer.expires  = jiffies + 10;
  61
  62        add_timer(&loopback_timer);
  63}
  64
  65static void rose_loopback_timer(unsigned long param)
  66{
  67        struct sk_buff *skb;
  68        struct net_device *dev;
  69        rose_address *dest;
  70        struct sock *sk;
  71        unsigned short frametype;
  72        unsigned int lci_i, lci_o;
  73
  74        while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  75                lci_i     = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
  76                frametype = skb->data[2];
  77                dest      = (rose_address *)(skb->data + 4);
  78                lci_o     = 0xFFF - lci_i;
  79
  80                skb_reset_transport_header(skb);
  81
  82                sk = rose_find_socket(lci_o, rose_loopback_neigh);
  83                if (sk) {
  84                        if (rose_process_rx_frame(sk, skb) == 0)
  85                                kfree_skb(skb);
  86                        continue;
  87                }
  88
  89                if (frametype == ROSE_CALL_REQUEST) {
  90                        if ((dev = rose_dev_get(dest)) != NULL) {
  91                                if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
  92                                        kfree_skb(skb);
  93                        } else {
  94                                kfree_skb(skb);
  95                        }
  96                } else {
  97                        kfree_skb(skb);
  98                }
  99        }
 100}
 101
 102void __exit rose_loopback_clear(void)
 103{
 104        struct sk_buff *skb;
 105
 106        del_timer(&loopback_timer);
 107
 108        while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
 109                skb->sk = NULL;
 110                kfree_skb(skb);
 111        }
 112}
 113