[linux.git] / net / rose / rose_link.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 ([email protected])
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/netfilter.h>
#include <net/rose.h>

static void rose_ftimer_expiry(unsigned long);
static void rose_t0timer_expiry(unsigned long);

static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
static void rose_transmit_restart_request(struct rose_neigh *neigh);

void rose_start_ftimer(struct rose_neigh *neigh)
{
	del_timer(&neigh->ftimer);

	neigh->ftimer.data     = (unsigned long)neigh;
	neigh->ftimer.function = &rose_ftimer_expiry;
	neigh->ftimer.expires  =
		jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);

	add_timer(&neigh->ftimer);
}

static void rose_start_t0timer(struct rose_neigh *neigh)
{
	del_timer(&neigh->t0timer);

	neigh->t0timer.data     = (unsigned long)neigh;
	neigh->t0timer.function = &rose_t0timer_expiry;
	neigh->t0timer.expires  =
		jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);

	add_timer(&neigh->t0timer);
}

void rose_stop_ftimer(struct rose_neigh *neigh)
{
	del_timer(&neigh->ftimer);
}

void rose_stop_t0timer(struct rose_neigh *neigh)
{
	del_timer(&neigh->t0timer);
}

int rose_ftimer_running(struct rose_neigh *neigh)
{
	return timer_pending(&neigh->ftimer);
}

static int rose_t0timer_running(struct rose_neigh *neigh)
{
	return timer_pending(&neigh->t0timer);
}

static void rose_ftimer_expiry(unsigned long param)
{
}

static void rose_t0timer_expiry(unsigned long param)
{
	struct rose_neigh *neigh = (struct rose_neigh *)param;

	rose_transmit_restart_request(neigh);

	neigh->dce_mode = 0;

	rose_start_t0timer(neigh);
}

/*
 *	Interface to ax25_send_frame. Changes my level 2 callsign depending
 *	on whether we have a global ROSE callsign or use the default port
 *	callsign.
 */
static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
{
	ax25_address *rose_call;
	ax25_cb *ax25s;

	if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
		rose_call = (ax25_address *)neigh->dev->dev_addr;
	else
		rose_call = &rose_callsign;

	ax25s = neigh->ax25;
	neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
	if (ax25s)
		ax25_cb_put(ax25s);

	return (neigh->ax25 != NULL);
}

/*
 *	Interface to ax25_link_up. Changes my level 2 callsign depending
 *	on whether we have a global ROSE callsign or use the default port
 *	callsign.
 */
static int rose_link_up(struct rose_neigh *neigh)
{
	ax25_address *rose_call;
	ax25_cb *ax25s;

	if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
		rose_call = (ax25_address *)neigh->dev->dev_addr;
	else
		rose_call = &rose_callsign;

	ax25s = neigh->ax25;
	neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
	if (ax25s)
		ax25_cb_put(ax25s);

	return (neigh->ax25 != NULL);
}

/*
 *	This handles all restart and diagnostic frames.
 */
void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
{
	struct sk_buff *skbn;

	switch (frametype) {
	case ROSE_RESTART_REQUEST:
		rose_stop_t0timer(neigh);
		neigh->restarted = 1;
		neigh->dce_mode  = (skb->data[3] == ROSE_DTE_ORIGINATED);
		rose_transmit_restart_confirmation(neigh);
		break;

	case ROSE_RESTART_CONFIRMATION:
		rose_stop_t0timer(neigh);
		neigh->restarted = 1;
		break;

	case ROSE_DIAGNOSTIC:
		printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
		break;

	default:
		printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
		break;
	}

	if (neigh->restarted) {
		while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
			if (!rose_send_frame(skbn, neigh))
				kfree_skb(skbn);
	}
}

/*
 *	This routine is called when a Restart Request is needed
 */
static void rose_transmit_restart_request(struct rose_neigh *neigh)
{
	struct sk_buff *skb;
	unsigned char *dptr;
	int len;

	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;

	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
		return;

	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);

	dptr = skb_put(skb, ROSE_MIN_LEN + 3);

	*dptr++ = AX25_P_ROSE;
	*dptr++ = ROSE_GFI;
	*dptr++ = 0x00;
	*dptr++ = ROSE_RESTART_REQUEST;
	*dptr++ = ROSE_DTE_ORIGINATED;
	*dptr++ = 0;

	if (!rose_send_frame(skb, neigh))
		kfree_skb(skb);
}

/*
 * This routine is called when a Restart Confirmation is needed
 */
static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
{
	struct sk_buff *skb;
	unsigned char *dptr;
	int len;

	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;

	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
		return;

	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);

	dptr = skb_put(skb, ROSE_MIN_LEN + 1);

	*dptr++ = AX25_P_ROSE;
	*dptr++ = ROSE_GFI;
	*dptr++ = 0x00;
	*dptr++ = ROSE_RESTART_CONFIRMATION;

	if (!rose_send_frame(skb, neigh))
		kfree_skb(skb);
}

/*
 * This routine is called when a Clear Request is needed outside of the context
 * of a connected socket.
 */
void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
{
	struct sk_buff *skb;
	unsigned char *dptr;
	int len;

	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;

	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
		return;

	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);

	dptr = skb_put(skb, ROSE_MIN_LEN + 3);

	*dptr++ = AX25_P_ROSE;
	*dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
	*dptr++ = ((lci >> 0) & 0xFF);
	*dptr++ = ROSE_CLEAR_REQUEST;
	*dptr++ = cause;
	*dptr++ = diagnostic;

	if (!rose_send_frame(skb, neigh))
		kfree_skb(skb);
}

void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
{
	unsigned char *dptr;

#if 0
	if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
		kfree_skb(skb);
		return;
	}
#endif

	if (neigh->loopback) {
		rose_loopback_queue(skb, neigh);
		return;
	}

	if (!rose_link_up(neigh))
		neigh->restarted = 0;

	dptr = skb_push(skb, 1);
	*dptr++ = AX25_P_ROSE;

	if (neigh->restarted) {
		if (!rose_send_frame(skb, neigh))
			kfree_skb(skb);
	} else {
		skb_queue_tail(&neigh->queue, skb);

		if (!rose_t0timer_running(neigh)) {
			rose_transmit_restart_request(neigh);
			neigh->dce_mode = 0;
			rose_start_t0timer(neigh);
		}
	}
}
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 ([email protected])
	8	*/
	9	#include <linux/errno.h>
	10	#include <linux/types.h>
	11	#include <linux/socket.h>
	12	#include <linux/in.h>
	13	#include <linux/kernel.h>
	14	#include <linux/jiffies.h>
	15	#include <linux/timer.h>
	16	#include <linux/string.h>
	17	#include <linux/sockios.h>
	18	#include <linux/net.h>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20	#include <net/ax25.h>
	21	#include <linux/inet.h>
	22	#include <linux/netdevice.h>
	23	#include <linux/skbuff.h>
	24	#include <net/sock.h>
	25	#include <asm/system.h>
	26	#include <linux/fcntl.h>
	27	#include <linux/mm.h>
	28	#include <linux/interrupt.h>
	29	#include <linux/netfilter.h>
	30	#include <net/rose.h>
	31
	32	static void rose_ftimer_expiry(unsigned long);
	33	static void rose_t0timer_expiry(unsigned long);
	34
	35	static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
	36	static void rose_transmit_restart_request(struct rose_neigh *neigh);
	37
	38	void rose_start_ftimer(struct rose_neigh *neigh)
	39	{
	40	del_timer(&neigh->ftimer);
	41
	42	neigh->ftimer.data = (unsigned long)neigh;
	43	neigh->ftimer.function = &rose_ftimer_expiry;
82e84249 RB	44	neigh->ftimer.expires =
82e84249 RB	45	jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
1da177e4 LT	46
	47	add_timer(&neigh->ftimer);
	48	}
	49
	50	static void rose_start_t0timer(struct rose_neigh *neigh)
	51	{
	52	del_timer(&neigh->t0timer);
	53
	54	neigh->t0timer.data = (unsigned long)neigh;
	55	neigh->t0timer.function = &rose_t0timer_expiry;
82e84249 RB	56	neigh->t0timer.expires =
82e84249 RB	57	jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
1da177e4 LT	58
	59	add_timer(&neigh->t0timer);
	60	}
	61
	62	void rose_stop_ftimer(struct rose_neigh *neigh)
	63	{
	64	del_timer(&neigh->ftimer);
	65	}
	66
	67	void rose_stop_t0timer(struct rose_neigh *neigh)
	68	{
	69	del_timer(&neigh->t0timer);
	70	}
	71
	72	int rose_ftimer_running(struct rose_neigh *neigh)
	73	{
	74	return timer_pending(&neigh->ftimer);
	75	}
	76
	77	static int rose_t0timer_running(struct rose_neigh *neigh)
	78	{
	79	return timer_pending(&neigh->t0timer);
	80	}
	81
	82	static void rose_ftimer_expiry(unsigned long param)
	83	{
	84	}
	85
	86	static void rose_t0timer_expiry(unsigned long param)
	87	{
	88	struct rose_neigh neigh = (struct rose_neigh )param;
	89
	90	rose_transmit_restart_request(neigh);
	91
	92	neigh->dce_mode = 0;
	93
	94	rose_start_t0timer(neigh);
	95	}
	96
	97	/*
	98	* Interface to ax25_send_frame. Changes my level 2 callsign depending
	99	* on whether we have a global ROSE callsign or use the default port
	100	* callsign.
	101	*/
	102	static int rose_send_frame(struct sk_buff skb, struct rose_neigh neigh)
	103	{
	104	ax25_address *rose_call;
d00c362f	105	ax25_cb *ax25s;
1da177e4 LT	106
	107	if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
	108	rose_call = (ax25_address *)neigh->dev->dev_addr;
	109	else
	110	rose_call = &rose_callsign;
	111
d00c362f	112	ax25s = neigh->ax25;
1da177e4	113	neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
d00c362f JP	114	if (ax25s)
d00c362f JP	115	ax25_cb_put(ax25s);
1da177e4 LT	116
	117	return (neigh->ax25 != NULL);
	118	}
	119
	120	/*
	121	* Interface to ax25_link_up. Changes my level 2 callsign depending
	122	* on whether we have a global ROSE callsign or use the default port
	123	* callsign.
	124	*/
	125	static int rose_link_up(struct rose_neigh *neigh)
	126	{
	127	ax25_address *rose_call;
d00c362f	128	ax25_cb *ax25s;
1da177e4 LT	129
	130	if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
	131	rose_call = (ax25_address *)neigh->dev->dev_addr;
	132	else
	133	rose_call = &rose_callsign;
	134
d00c362f	135	ax25s = neigh->ax25;
1da177e4	136	neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
d00c362f JP	137	if (ax25s)
d00c362f JP	138	ax25_cb_put(ax25s);
1da177e4 LT	139
	140	return (neigh->ax25 != NULL);
	141	}
	142
	143	/*
	144	* This handles all restart and diagnostic frames.
	145	*/
	146	void rose_link_rx_restart(struct sk_buff skb, struct rose_neigh neigh, unsigned short frametype)
	147	{
	148	struct sk_buff *skbn;
	149
	150	switch (frametype) {
	151	case ROSE_RESTART_REQUEST:
	152	rose_stop_t0timer(neigh);
	153	neigh->restarted = 1;
	154	neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
	155	rose_transmit_restart_confirmation(neigh);
	156	break;
	157
	158	case ROSE_RESTART_CONFIRMATION:
	159	rose_stop_t0timer(neigh);
	160	neigh->restarted = 1;
	161	break;
	162
	163	case ROSE_DIAGNOSTIC:
	164	printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
	165	break;
	166
	167	default:
	168	printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
	169	break;
	170	}
	171
	172	if (neigh->restarted) {
	173	while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
	174	if (!rose_send_frame(skbn, neigh))
	175	kfree_skb(skbn);
	176	}
	177	}
	178
	179	/*
	180	* This routine is called when a Restart Request is needed
	181	*/
	182	static void rose_transmit_restart_request(struct rose_neigh *neigh)
	183	{
	184	struct sk_buff *skb;
	185	unsigned char *dptr;
	186	int len;
	187
	188	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
	189
	190	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
	191	return;
	192
	193	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
	194
	195	dptr = skb_put(skb, ROSE_MIN_LEN + 3);
	196
	197	*dptr++ = AX25_P_ROSE;
	198	*dptr++ = ROSE_GFI;
	199	*dptr++ = 0x00;
	200	*dptr++ = ROSE_RESTART_REQUEST;
	201	*dptr++ = ROSE_DTE_ORIGINATED;
	202	*dptr++ = 0;
203
204	if (!rose_send_frame(skb, neigh))
205	kfree_skb(skb);
206	}
207
208	/*
209	* This routine is called when a Restart Confirmation is needed
210	*/
211	static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
212	{
213	struct sk_buff *skb;
214	unsigned char *dptr;
215	int len;
216
217	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
218
219	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
220	return;
221
222	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
223
224	dptr = skb_put(skb, ROSE_MIN_LEN + 1);
225
226	*dptr++ = AX25_P_ROSE;
227	*dptr++ = ROSE_GFI;
228	*dptr++ = 0x00;
229	*dptr++ = ROSE_RESTART_CONFIRMATION;
230
231	if (!rose_send_frame(skb, neigh))
232	kfree_skb(skb);
233	}
234
235	/*
236	* This routine is called when a Clear Request is needed outside of the context
237	* of a connected socket.
238	*/
239	void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
240	{
241	struct sk_buff *skb;
242	unsigned char *dptr;
243	int len;
244
245	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
246
247	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
248	return;
249
250	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
251
252	dptr = skb_put(skb, ROSE_MIN_LEN + 3);
253
254	*dptr++ = AX25_P_ROSE;
255	*dptr++ = ((lci >> 8) & 0x0F) \| ROSE_GFI;
256	*dptr++ = ((lci >> 0) & 0xFF);
257	*dptr++ = ROSE_CLEAR_REQUEST;
258	*dptr++ = cause;
259	*dptr++ = diagnostic;
260
261	if (!rose_send_frame(skb, neigh))
262	kfree_skb(skb);
263	}
264
265	void rose_transmit_link(struct sk_buff skb, struct rose_neigh neigh)
266	{
267	unsigned char *dptr;
268
269	#if 0
270	if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
271	kfree_skb(skb);
272	return;
273	}
274	#endif
275
276	if (neigh->loopback) {
277	rose_loopback_queue(skb, neigh);
278	return;
279	}
280
281	if (!rose_link_up(neigh))
282	neigh->restarted = 0;
283
284	dptr = skb_push(skb, 1);
285	*dptr++ = AX25_P_ROSE;
286
287	if (neigh->restarted) {
288	if (!rose_send_frame(skb, neigh))
289	kfree_skb(skb);
290	} else {
291	skb_queue_tail(&neigh->queue, skb);
292
293	if (!rose_t0timer_running(neigh)) {
294	rose_transmit_restart_request(neigh);
295	neigh->dce_mode = 0;
296	rose_start_t0timer(neigh);
297	}
298	}
299	}