root/net/rose/rose_loopback.c

DEFINITIONS

1. rose_loopback_init
2. rose_loopback_running
3. rose_loopback_queue
4. rose_set_loopback_timer
5. rose_loopback_timer
6. rose_loopback_clear

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 */
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/timer.h>
#include <net/ax25.h>
#include <linux/skbuff.h>
#include <net/rose.h>
#include <linux/init.h>

static struct sk_buff_head loopback_queue;
static struct timer_list loopback_timer;

static void rose_set_loopback_timer(void);

void rose_loopback_init(void)
{
        skb_queue_head_init(&loopback_queue);

        init_timer(&loopback_timer);
}

static int rose_loopback_running(void)
{
        return timer_pending(&loopback_timer);
}

int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
{
        struct sk_buff *skbn;

        skbn = skb_clone(skb, GFP_ATOMIC);

        kfree_skb(skb);

        if (skbn != NULL) {
                skb_queue_tail(&loopback_queue, skbn);

                if (!rose_loopback_running())
                        rose_set_loopback_timer();
        }

        return 1;
}

static void rose_loopback_timer(unsigned long);

static void rose_set_loopback_timer(void)
{
        del_timer(&loopback_timer);

        loopback_timer.data     = 0;
        loopback_timer.function = &rose_loopback_timer;
        loopback_timer.expires  = jiffies + 10;

        add_timer(&loopback_timer);
}

static void rose_loopback_timer(unsigned long param)
{
        struct sk_buff *skb;
        struct net_device *dev;
        rose_address *dest;
        struct sock *sk;
        unsigned short frametype;
        unsigned int lci_i, lci_o;

        while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
                lci_i     = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
                frametype = skb->data[2];
                dest      = (rose_address *)(skb->data + 4);
                lci_o     = 0xFFF - lci_i;

                skb_reset_transport_header(skb);

                sk = rose_find_socket(lci_o, rose_loopback_neigh);
                if (sk) {
                        if (rose_process_rx_frame(sk, skb) == 0)
                                kfree_skb(skb);
                        continue;
                }

                if (frametype == ROSE_CALL_REQUEST) {
                        if ((dev = rose_dev_get(dest)) != NULL) {
                                if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
                                        kfree_skb(skb);
                        } else {
                                kfree_skb(skb);
                        }
                } else {
                        kfree_skb(skb);
                }
        }
}

void __exit rose_loopback_clear(void)
{
        struct sk_buff *skb;

        del_timer(&loopback_timer);

        while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
                skb->sk = NULL;
                kfree_skb(skb);
        }
}