linux/net/rose/rose_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 (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   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/rose.h>
  16#include <linux/init.h>
  17
  18static struct sk_buff_head loopback_queue;
  19static struct timer_list loopback_timer;
  20
  21static void rose_set_loopback_timer(void);
  22
  23void rose_loopback_init(void)
  24{
  25        skb_queue_head_init(&loopback_queue);
  26
  27        init_timer(&loopback_timer);
  28}
  29
  30static int rose_loopback_running(void)
  31{
  32        return timer_pending(&loopback_timer);
  33}
  34
  35int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
  36{
  37        struct sk_buff *skbn;
  38
  39        skbn = skb_clone(skb, GFP_ATOMIC);
  40
  41        kfree_skb(skb);
  42
  43        if (skbn != NULL) {
  44                skb_queue_tail(&loopback_queue, skbn);
  45
  46                if (!rose_loopback_running())
  47                        rose_set_loopback_timer();
  48        }
  49
  50        return 1;
  51}
  52
  53static void rose_loopback_timer(unsigned long);
  54
  55static void rose_set_loopback_timer(void)
  56{
  57        del_timer(&loopback_timer);
  58
  59        loopback_timer.data     = 0;
  60        loopback_timer.function = &rose_loopback_timer;
  61        loopback_timer.expires  = jiffies + 10;
  62
  63        add_timer(&loopback_timer);
  64}
  65
  66static void rose_loopback_timer(unsigned long param)
  67{
  68        struct sk_buff *skb;
  69        struct net_device *dev;
  70        rose_address *dest;
  71        struct sock *sk;
  72        unsigned short frametype;
  73        unsigned int lci_i, lci_o;
  74
  75        while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  76                if (skb->len < ROSE_MIN_LEN) {
  77                        kfree_skb(skb);
  78                        continue;
  79                }
  80                lci_i     = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
  81                frametype = skb->data[2];
  82                if (frametype == ROSE_CALL_REQUEST &&
  83                    (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
  84                     skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
  85                     ROSE_CALL_REQ_ADDR_LEN_VAL)) {
  86                        kfree_skb(skb);
  87                        continue;
  88                }
  89                dest      = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
  90                lci_o     = ROSE_DEFAULT_MAXVC + 1 - lci_i;
  91
  92                skb_reset_transport_header(skb);
  93
  94                sk = rose_find_socket(lci_o, rose_loopback_neigh);
  95                if (sk) {
  96                        if (rose_process_rx_frame(sk, skb) == 0)
  97                                kfree_skb(skb);
  98                        continue;
  99                }
 100
 101                if (frametype == ROSE_CALL_REQUEST) {
 102                        if ((dev = rose_dev_get(dest)) != NULL) {
 103                                if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
 104                                        kfree_skb(skb);
 105                        } else {
 106                                kfree_skb(skb);
 107                        }
 108                } else {
 109                        kfree_skb(skb);
 110                }
 111        }
 112}
 113
 114void __exit rose_loopback_clear(void)
 115{
 116        struct sk_buff *skb;
 117
 118        del_timer(&loopback_timer);
 119
 120        while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
 121                skb->sk = NULL;
 122                kfree_skb(skb);
 123        }
 124}
 125
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