[GitHub/mt8127/android_kernel_alcatel_ttab.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);

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) {
		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);
	22
	23	void rose_loopback_init(void)
	24	{
	25	skb_queue_head_init(&loopback_queue);
	26
	27	init_timer(&loopback_timer);
	28	}
	29
	30	static int rose_loopback_running(void)
	31	{
	32	return timer_pending(&loopback_timer);
	33	}
	34
	35	int 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
	53	static void rose_loopback_timer(unsigned long);
	54
	55	static 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
	66	static 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) {
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	}
	112	}
	113
	114	void __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	}