[mirror_ubuntu-bionic-kernel.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;
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;

	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_set_loopback_timer(void)
{
	del_timer(&loopback_timer);

	loopback_timer.expires  = jiffies + 10;
	add_timer(&loopback_timer);
}

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;

	while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
		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);
		}
	}
}

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;
	19	static struct timer_list loopback_timer;
	20
	21	static void rose_set_loopback_timer(void);
4966babd	22	static void rose_loopback_timer(struct timer_list *unused);
1da177e4 LT	23
	24	void rose_loopback_init(void)
	25	{
	26	skb_queue_head_init(&loopback_queue);
	27
4966babd	28	timer_setup(&loopback_timer, rose_loopback_timer, 0);
1da177e4 LT	29	}
	30
	31	static int rose_loopback_running(void)
	32	{
	33	return timer_pending(&loopback_timer);
	34	}
	35
	36	int rose_loopback_queue(struct sk_buff skb, struct rose_neigh neigh)
	37	{
	38	struct sk_buff *skbn;
	39
	40	skbn = skb_clone(skb, GFP_ATOMIC);
	41
	42	kfree_skb(skb);
	43
	44	if (skbn != NULL) {
	45	skb_queue_tail(&loopback_queue, skbn);
	46
	47	if (!rose_loopback_running())
	48	rose_set_loopback_timer();
	49	}
	50
	51	return 1;
	52	}
	53
1da177e4 LT	54
	55	static void rose_set_loopback_timer(void)
	56	{
	57	del_timer(&loopback_timer);
	58
1da177e4	59	loopback_timer.expires = jiffies + 10;
1da177e4 LT	60	add_timer(&loopback_timer);
	61	}
	62
4966babd	63	static void rose_loopback_timer(struct timer_list *unused)
1da177e4 LT	64	{
	65	struct sk_buff *skb;
	66	struct net_device *dev;
	67	rose_address *dest;
	68	struct sock *sk;
	69	unsigned short frametype;
	70	unsigned int lci_i, lci_o;
	71
	72	while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
e0bccd31 BH	73	if (skb->len < ROSE_MIN_LEN) {
	74	kfree_skb(skb);
	75	continue;
	76	}
1da177e4 LT	77	lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
1da177e4 LT	78	frametype = skb->data[2];
e0bccd31 BH	79	if (frametype == ROSE_CALL_REQUEST &&
	80	(skb->len <= ROSE_CALL_REQ_FACILITIES_OFF \|\|
	81	skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
	82	ROSE_CALL_REQ_ADDR_LEN_VAL)) {
	83	kfree_skb(skb);
	84	continue;
	85	}
	86	dest = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
1f731b63	87	lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i;
1da177e4	88
badff6d0	89	skb_reset_transport_header(skb);
1da177e4	90
891e6a93	91	sk = rose_find_socket(lci_o, rose_loopback_neigh);
a3d38402	92	if (sk) {
1da177e4 LT	93	if (rose_process_rx_frame(sk, skb) == 0)
	94	kfree_skb(skb);
	95	continue;
	96	}
	97
	98	if (frametype == ROSE_CALL_REQUEST) {
	99	if ((dev = rose_dev_get(dest)) != NULL) {
891e6a93	100	if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
1da177e4 LT	101	kfree_skb(skb);
	102	} else {
	103	kfree_skb(skb);
	104	}
	105	} else {
	106	kfree_skb(skb);
	107	}
	108	}
	109	}
	110
	111	void __exit rose_loopback_clear(void)
	112	{
	113	struct sk_buff *skb;
	114
	115	del_timer(&loopback_timer);
	116
	117	while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
	118	skb->sk = NULL;
	119	kfree_skb(skb);
	120	}
	121	}