[linux-2.6-block.git] / net / rose / rose_loopback.c

/*
 * 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/slab.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;
#define ROSE_LOOPBACK_LIMIT 1000
static struct timer_list loopback_timer;

static void rose_set_loopback_timer(void);
static void rose_loopback_timer(struct timer_list *unused);

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

	timer_setup(&loopback_timer, rose_loopback_timer, 0);
}

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 = NULL;

	if (skb_queue_len(&loopback_queue) < ROSE_LOOPBACK_LIMIT)
		skbn = skb_clone(skb, GFP_ATOMIC);

	if (skbn) {
		consume_skb(skb);
		skb_queue_tail(&loopback_queue, skbn);

		if (!rose_loopback_running())
			rose_set_loopback_timer();
	} else {
		kfree_skb(skb);
	}

	return 1;
}

static void rose_set_loopback_timer(void)
{
	mod_timer(&loopback_timer, jiffies + 10);
}

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

	for (count = 0; count < ROSE_LOOPBACK_LIMIT; count++) {
		skb = skb_dequeue(&loopback_queue);
		if (!skb)
			return;
		if (skb->len < ROSE_MIN_LEN) {
			kfree_skb(skb);
			continue;
		}
		lci_i     = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
		frametype = skb->data[2];
		if (frametype == ROSE_CALL_REQUEST &&
		    (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
		     skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
		     ROSE_CALL_REQ_ADDR_LEN_VAL)) {
			kfree_skb(skb);
			continue;
		}
		dest      = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
		lci_o     = ROSE_DEFAULT_MAXVC + 1 - 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);
		}
	}
	if (!skb_queue_empty(&loopback_queue))
		mod_timer(&loopback_timer, jiffies + 1);
}

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);
	}
}
Commit	Line	Data
1da177e4 LT	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>
5a0e3ad6	10	#include <linux/slab.h>
1da177e4 LT	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
	18	static struct sk_buff_head loopback_queue;
0453c682	19	#define ROSE_LOOPBACK_LIMIT 1000
1da177e4 LT	20	static struct timer_list loopback_timer;
	21
	22	static void rose_set_loopback_timer(void);
4966babd	23	static void rose_loopback_timer(struct timer_list *unused);
1da177e4 LT	24
	25	void rose_loopback_init(void)
	26	{
	27	skb_queue_head_init(&loopback_queue);
	28
4966babd	29	timer_setup(&loopback_timer, rose_loopback_timer, 0);
1da177e4 LT	30	}
	31
	32	static int rose_loopback_running(void)
	33	{
	34	return timer_pending(&loopback_timer);
	35	}
	36
	37	int rose_loopback_queue(struct sk_buff skb, struct rose_neigh neigh)
	38	{
0453c682	39	struct sk_buff *skbn = NULL;
1da177e4	40
0453c682 ED	41	if (skb_queue_len(&loopback_queue) < ROSE_LOOPBACK_LIMIT)
0453c682 ED	42	skbn = skb_clone(skb, GFP_ATOMIC);
1da177e4	43
0453c682 ED	44	if (skbn) {
0453c682 ED	45	consume_skb(skb);
1da177e4 LT	46	skb_queue_tail(&loopback_queue, skbn);
	47
	48	if (!rose_loopback_running())
	49	rose_set_loopback_timer();
0453c682 ED	50	} else {
0453c682 ED	51	kfree_skb(skb);
1da177e4 LT	52	}
	53
	54	return 1;
	55	}
	56
1da177e4 LT	57	static void rose_set_loopback_timer(void)
1da177e4 LT	58	{
0453c682	59	mod_timer(&loopback_timer, jiffies + 10);
1da177e4 LT	60	}
1da177e4 LT	61
4966babd	62	static void rose_loopback_timer(struct timer_list *unused)
1da177e4 LT	63	{
	64	struct sk_buff *skb;
	65	struct net_device *dev;
	66	rose_address *dest;
	67	struct sock *sk;
	68	unsigned short frametype;
	69	unsigned int lci_i, lci_o;
0453c682	70	int count;
1da177e4	71
0453c682 ED	72	for (count = 0; count < ROSE_LOOPBACK_LIMIT; count++) {
	73	skb = skb_dequeue(&loopback_queue);
	74	if (!skb)
	75	return;
e0bccd31 BH	76	if (skb->len < ROSE_MIN_LEN) {
	77	kfree_skb(skb);
	78	continue;
	79	}
1da177e4 LT	80	lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
1da177e4 LT	81	frametype = skb->data[2];
e0bccd31 BH	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);
1f731b63	90	lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i;
1da177e4	91
badff6d0	92	skb_reset_transport_header(skb);
1da177e4	93
891e6a93	94	sk = rose_find_socket(lci_o, rose_loopback_neigh);
a3d38402	95	if (sk) {
1da177e4 LT	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) {
891e6a93	103	if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
1da177e4 LT	104	kfree_skb(skb);
	105	} else {
	106	kfree_skb(skb);
	107	}
	108	} else {
	109	kfree_skb(skb);
	110	}
	111	}
0453c682 ED	112	if (!skb_queue_empty(&loopback_queue))
0453c682 ED	113	mod_timer(&loopback_timer, jiffies + 1);
1da177e4 LT	114	}
	115
	116	void __exit rose_loopback_clear(void)
	117	{
	118	struct sk_buff *skb;
	119
	120	del_timer(&loopback_timer);
	121
	122	while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
	123	skb->sk = NULL;
	124	kfree_skb(skb);
	125	}
	126	}