[linux-block.git] / net / ax25 / ax25_out.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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/spinlock.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>

static DEFINE_SPINLOCK(ax25_frag_lock);

ax25_cb *ax25_send_frame(struct sk_buff *skb, int paclen, ax25_address *src, ax25_address *dest, ax25_digi *digi, struct net_device *dev)
{
	ax25_dev *ax25_dev;
	ax25_cb *ax25;

	/*
	 * Take the default packet length for the device if zero is
	 * specified.
	 */
	if (paclen == 0) {
		if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
			return NULL;

		paclen = ax25_dev->values[AX25_VALUES_PACLEN];
	}

	/*
	 * Look for an existing connection.
	 */
	if ((ax25 = ax25_find_cb(src, dest, digi, dev)) != NULL) {
		ax25_output(ax25, paclen, skb);
		return ax25;		/* It already existed */
	}

	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
		return NULL;

	if ((ax25 = ax25_create_cb()) == NULL)
		return NULL;

	ax25_fillin_cb(ax25, ax25_dev);

	ax25->source_addr = *src;
	ax25->dest_addr   = *dest;

	if (digi != NULL) {
		ax25->digipeat = kmemdup(digi, sizeof(*digi), GFP_ATOMIC);
		if (ax25->digipeat == NULL) {
			ax25_cb_put(ax25);
			return NULL;
		}
	}

	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
	case AX25_PROTO_STD_SIMPLEX:
	case AX25_PROTO_STD_DUPLEX:
		ax25_std_establish_data_link(ax25);
		break;

#ifdef CONFIG_AX25_DAMA_SLAVE
	case AX25_PROTO_DAMA_SLAVE:
		if (ax25_dev->dama.slave)
			ax25_ds_establish_data_link(ax25);
		else
			ax25_std_establish_data_link(ax25);
		break;
#endif
	}

	ax25_cb_add(ax25);

	ax25->state = AX25_STATE_1;

	ax25_start_heartbeat(ax25);

	ax25_output(ax25, paclen, skb);

	return ax25;			/* We had to create it */
}

EXPORT_SYMBOL(ax25_send_frame);

/*
 *	All outgoing AX.25 I frames pass via this routine. Therefore this is
 *	where the fragmentation of frames takes place. If fragment is set to
 *	zero then we are not allowed to do fragmentation, even if the frame
 *	is too large.
 */
void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
{
	struct sk_buff *skbn;
	unsigned char *p;
	int frontlen, len, fragno, ka9qfrag, first = 1;

	if ((skb->len - 1) > paclen) {
		if (*skb->data == AX25_P_TEXT) {
			skb_pull(skb, 1); /* skip PID */
			ka9qfrag = 0;
		} else {
			paclen -= 2;	/* Allow for fragment control info */
			ka9qfrag = 1;
		}

		fragno = skb->len / paclen;
		if (skb->len % paclen == 0) fragno--;

		frontlen = skb_headroom(skb);	/* Address space + CTRL */

		while (skb->len > 0) {
			spin_lock_bh(&ax25_frag_lock);
			if ((skbn = alloc_skb(paclen + 2 + frontlen, GFP_ATOMIC)) == NULL) {
				spin_unlock_bh(&ax25_frag_lock);
				printk(KERN_CRIT "AX.25: ax25_output - out of memory\n");
				return;
			}

			if (skb->sk != NULL)
				skb_set_owner_w(skbn, skb->sk);

			spin_unlock_bh(&ax25_frag_lock);

			len = (paclen > skb->len) ? skb->len : paclen;

			if (ka9qfrag == 1) {
				skb_reserve(skbn, frontlen + 2);
				skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
				memcpy(skb_put(skbn, len), skb->data, len);
				p = skb_push(skbn, 2);

				*p++ = AX25_P_SEGMENT;

				*p = fragno--;
				if (first) {
					*p |= AX25_SEG_FIRST;
					first = 0;
				}
			} else {
				skb_reserve(skbn, frontlen + 1);
				skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
				memcpy(skb_put(skbn, len), skb->data, len);
				p = skb_push(skbn, 1);
				*p = AX25_P_TEXT;
			}

			skb_pull(skb, len);
			skb_queue_tail(&ax25->write_queue, skbn); /* Throw it on the queue */
		}

		kfree_skb(skb);
	} else {
		skb_queue_tail(&ax25->write_queue, skb);	  /* Throw it on the queue */
	}

	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
	case AX25_PROTO_STD_SIMPLEX:
	case AX25_PROTO_STD_DUPLEX:
		ax25_kick(ax25);
		break;

#ifdef CONFIG_AX25_DAMA_SLAVE
	/*
	 * A DAMA slave is _required_ to work as normal AX.25L2V2
	 * if no DAMA master is available.
	 */
	case AX25_PROTO_DAMA_SLAVE:
		if (!ax25->ax25_dev->dama.slave) ax25_kick(ax25);
		break;
#endif
	}
}

/*
 *  This procedure is passed a buffer descriptor for an iframe. It builds
 *  the rest of the control part of the frame and then writes it out.
 */
static void ax25_send_iframe(ax25_cb *ax25, struct sk_buff *skb, int poll_bit)
{
	unsigned char *frame;

	if (skb == NULL)
		return;

	skb->nh.raw = skb->data;

	if (ax25->modulus == AX25_MODULUS) {
		frame = skb_push(skb, 1);

		*frame = AX25_I;
		*frame |= (poll_bit) ? AX25_PF : 0;
		*frame |= (ax25->vr << 5);
		*frame |= (ax25->vs << 1);
	} else {
		frame = skb_push(skb, 2);

		frame[0] = AX25_I;
		frame[0] |= (ax25->vs << 1);
		frame[1] = (poll_bit) ? AX25_EPF : 0;
		frame[1] |= (ax25->vr << 1);
	}

	ax25_start_idletimer(ax25);

	ax25_transmit_buffer(ax25, skb, AX25_COMMAND);
}

void ax25_kick(ax25_cb *ax25)
{
	struct sk_buff *skb, *skbn;
	int last = 1;
	unsigned short start, end, next;

	if (ax25->state != AX25_STATE_3 && ax25->state != AX25_STATE_4)
		return;

	if (ax25->condition & AX25_COND_PEER_RX_BUSY)
		return;

	if (skb_peek(&ax25->write_queue) == NULL)
		return;

	start = (skb_peek(&ax25->ack_queue) == NULL) ? ax25->va : ax25->vs;
	end   = (ax25->va + ax25->window) % ax25->modulus;

	if (start == end)
		return;

	ax25->vs = start;

	/*
	 * Transmit data until either we're out of data to send or
	 * the window is full. Send a poll on the final I frame if
	 * the window is filled.
	 */

	/*
	 * Dequeue the frame and copy it.
	 */
	skb  = skb_dequeue(&ax25->write_queue);

	do {
		if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
			skb_queue_head(&ax25->write_queue, skb);
			break;
		}

		if (skb->sk != NULL)
			skb_set_owner_w(skbn, skb->sk);

		next = (ax25->vs + 1) % ax25->modulus;
		last = (next == end);

		/*
		 * Transmit the frame copy.
		 * bke 960114: do not set the Poll bit on the last frame
		 * in DAMA mode.
		 */
		switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
		case AX25_PROTO_STD_SIMPLEX:
		case AX25_PROTO_STD_DUPLEX:
			ax25_send_iframe(ax25, skbn, (last) ? AX25_POLLON : AX25_POLLOFF);
			break;

#ifdef CONFIG_AX25_DAMA_SLAVE
		case AX25_PROTO_DAMA_SLAVE:
			ax25_send_iframe(ax25, skbn, AX25_POLLOFF);
			break;
#endif
		}

		ax25->vs = next;

		/*
		 * Requeue the original data frame.
		 */
		skb_queue_tail(&ax25->ack_queue, skb);

	} while (!last && (skb = skb_dequeue(&ax25->write_queue)) != NULL);

	ax25->condition &= ~AX25_COND_ACK_PENDING;

	if (!ax25_t1timer_running(ax25)) {
		ax25_stop_t3timer(ax25);
		ax25_calculate_t1(ax25);
		ax25_start_t1timer(ax25);
	}
}

void ax25_transmit_buffer(ax25_cb *ax25, struct sk_buff *skb, int type)
{
	struct sk_buff *skbn;
	unsigned char *ptr;
	int headroom;

	if (ax25->ax25_dev == NULL) {
		ax25_disconnect(ax25, ENETUNREACH);
		return;
	}

	headroom = ax25_addr_size(ax25->digipeat);

	if (skb_headroom(skb) < headroom) {
		if ((skbn = skb_realloc_headroom(skb, headroom)) == NULL) {
			printk(KERN_CRIT "AX.25: ax25_transmit_buffer - out of memory\n");
			kfree_skb(skb);
			return;
		}

		if (skb->sk != NULL)
			skb_set_owner_w(skbn, skb->sk);

		kfree_skb(skb);
		skb = skbn;
	}

	ptr = skb_push(skb, headroom);

	ax25_addr_build(ptr, &ax25->source_addr, &ax25->dest_addr, ax25->digipeat, type, ax25->modulus);

	ax25_queue_xmit(skb, ax25->ax25_dev->dev);
}

/*
 *	A small shim to dev_queue_xmit to add the KISS control byte, and do
 *	any packet forwarding in operation.
 */
void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev)
{
	unsigned char *ptr;

	skb->protocol = ax25_type_trans(skb, ax25_fwd_dev(dev));

	ptr  = skb_push(skb, 1);
	*ptr = 0x00;			/* KISS */

	dev_queue_xmit(skb);
}

int ax25_check_iframes_acked(ax25_cb *ax25, unsigned short nr)
{
	if (ax25->vs == nr) {
		ax25_frames_acked(ax25, nr);
		ax25_calculate_rtt(ax25);
		ax25_stop_t1timer(ax25);
		ax25_start_t3timer(ax25);
		return 1;
	} else {
		if (ax25->va != nr) {
			ax25_frames_acked(ax25, nr);
			ax25_calculate_t1(ax25);
			ax25_start_t1timer(ax25);
			return 1;
		}
	}
	return 0;
}
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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
	8	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	9	* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
	10	*/
1da177e4 LT	11	#include <linux/errno.h>
	12	#include <linux/types.h>
	13	#include <linux/socket.h>
	14	#include <linux/in.h>
	15	#include <linux/kernel.h>
70868eac	16	#include <linux/module.h>
1da177e4 LT	17	#include <linux/sched.h>
	18	#include <linux/timer.h>
	19	#include <linux/string.h>
	20	#include <linux/sockios.h>
	21	#include <linux/spinlock.h>
	22	#include <linux/net.h>
	23	#include <net/ax25.h>
	24	#include <linux/inet.h>
	25	#include <linux/netdevice.h>
	26	#include <linux/skbuff.h>
	27	#include <linux/netfilter.h>
	28	#include <net/sock.h>
	29	#include <asm/uaccess.h>
	30	#include <asm/system.h>
	31	#include <linux/fcntl.h>
	32	#include <linux/mm.h>
	33	#include <linux/interrupt.h>
	34
	35	static DEFINE_SPINLOCK(ax25_frag_lock);
	36
	37	ax25_cb ax25_send_frame(struct sk_buff skb, int paclen, ax25_address src, ax25_address dest, ax25_digi digi, struct net_device dev)
	38	{
	39	ax25_dev *ax25_dev;
	40	ax25_cb *ax25;
	41
	42	/*
	43	* Take the default packet length for the device if zero is
	44	* specified.
	45	*/
	46	if (paclen == 0) {
	47	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
	48	return NULL;
	49
	50	paclen = ax25_dev->values[AX25_VALUES_PACLEN];
	51	}
	52
	53	/*
	54	* Look for an existing connection.
	55	*/
	56	if ((ax25 = ax25_find_cb(src, dest, digi, dev)) != NULL) {
	57	ax25_output(ax25, paclen, skb);
	58	return ax25; /* It already existed */
	59	}
	60
	61	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
	62	return NULL;
	63
	64	if ((ax25 = ax25_create_cb()) == NULL)
	65	return NULL;
	66
	67	ax25_fillin_cb(ax25, ax25_dev);
	68
	69	ax25->source_addr = *src;
	70	ax25->dest_addr = *dest;
	71
	72	if (digi != NULL) {
0459d70a ACM	73	ax25->digipeat = kmemdup(digi, sizeof(*digi), GFP_ATOMIC);
0459d70a ACM	74	if (ax25->digipeat == NULL) {
1da177e4 LT	75	ax25_cb_put(ax25);
	76	return NULL;
	77	}
1da177e4 LT	78	}
	79
	80	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
	81	case AX25_PROTO_STD_SIMPLEX:
	82	case AX25_PROTO_STD_DUPLEX:
	83	ax25_std_establish_data_link(ax25);
	84	break;
	85
	86	#ifdef CONFIG_AX25_DAMA_SLAVE
	87	case AX25_PROTO_DAMA_SLAVE:
	88	if (ax25_dev->dama.slave)
	89	ax25_ds_establish_data_link(ax25);
	90	else
	91	ax25_std_establish_data_link(ax25);
	92	break;
	93	#endif
	94	}
	95
	96	ax25_cb_add(ax25);
	97
	98	ax25->state = AX25_STATE_1;
	99
	100	ax25_start_heartbeat(ax25);
	101
	102	ax25_output(ax25, paclen, skb);
	103
	104	return ax25; /* We had to create it */
	105	}
	106
70868eac RB	107	EXPORT_SYMBOL(ax25_send_frame);
70868eac RB	108
1da177e4 LT	109	/*
	110	* All outgoing AX.25 I frames pass via this routine. Therefore this is
	111	* where the fragmentation of frames takes place. If fragment is set to
	112	* zero then we are not allowed to do fragmentation, even if the frame
	113	* is too large.
	114	*/
	115	void ax25_output(ax25_cb ax25, int paclen, struct sk_buff skb)
	116	{
	117	struct sk_buff *skbn;
	118	unsigned char *p;
	119	int frontlen, len, fragno, ka9qfrag, first = 1;
	120
	121	if ((skb->len - 1) > paclen) {
	122	if (*skb->data == AX25_P_TEXT) {
	123	skb_pull(skb, 1); /* skip PID */
	124	ka9qfrag = 0;
	125	} else {
	126	paclen -= 2; /* Allow for fragment control info */
	127	ka9qfrag = 1;
	128	}
	129
	130	fragno = skb->len / paclen;
	131	if (skb->len % paclen == 0) fragno--;
	132
	133	frontlen = skb_headroom(skb); /* Address space + CTRL */
	134
	135	while (skb->len > 0) {
	136	spin_lock_bh(&ax25_frag_lock);
	137	if ((skbn = alloc_skb(paclen + 2 + frontlen, GFP_ATOMIC)) == NULL) {
	138	spin_unlock_bh(&ax25_frag_lock);
	139	printk(KERN_CRIT "AX.25: ax25_output - out of memory\n");
	140	return;
	141	}
	142
	143	if (skb->sk != NULL)
	144	skb_set_owner_w(skbn, skb->sk);
	145
	146	spin_unlock_bh(&ax25_frag_lock);
	147
	148	len = (paclen > skb->len) ? skb->len : paclen;
	149
	150	if (ka9qfrag == 1) {
	151	skb_reserve(skbn, frontlen + 2);
	152	skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
	153	memcpy(skb_put(skbn, len), skb->data, len);
	154	p = skb_push(skbn, 2);
	155
	156	*p++ = AX25_P_SEGMENT;
	157
	158	*p = fragno--;
	159	if (first) {
	160	*p \|= AX25_SEG_FIRST;
	161	first = 0;
	162	}
	163	} else {
	164	skb_reserve(skbn, frontlen + 1);
	165	skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
	166	memcpy(skb_put(skbn, len), skb->data, len);
	167	p = skb_push(skbn, 1);
	168	*p = AX25_P_TEXT;
	169	}
	170
	171	skb_pull(skb, len);
	172	skb_queue_tail(&ax25->write_queue, skbn); /* Throw it on the queue */
173	}
174
175	kfree_skb(skb);
176	} else {
177	skb_queue_tail(&ax25->write_queue, skb); /* Throw it on the queue */
178	}
179
180	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
181	case AX25_PROTO_STD_SIMPLEX:
182	case AX25_PROTO_STD_DUPLEX:
183	ax25_kick(ax25);
184	break;
185
186	#ifdef CONFIG_AX25_DAMA_SLAVE
187	/*
188	* A DAMA slave is _required_ to work as normal AX.25L2V2
189	* if no DAMA master is available.
190	*/
191	case AX25_PROTO_DAMA_SLAVE:
192	if (!ax25->ax25_dev->dama.slave) ax25_kick(ax25);
193	break;
194	#endif
195	}
196	}
197
198	/*
199	* This procedure is passed a buffer descriptor for an iframe. It builds
200	* the rest of the control part of the frame and then writes it out.
201	*/
202	static void ax25_send_iframe(ax25_cb ax25, struct sk_buff skb, int poll_bit)
203	{
204	unsigned char *frame;
205
206	if (skb == NULL)
207	return;
208
209	skb->nh.raw = skb->data;
210
211	if (ax25->modulus == AX25_MODULUS) {
212	frame = skb_push(skb, 1);
213
214	*frame = AX25_I;
215	*frame \|= (poll_bit) ? AX25_PF : 0;
216	*frame \|= (ax25->vr << 5);
217	*frame \|= (ax25->vs << 1);
218	} else {
219	frame = skb_push(skb, 2);
220
221	frame[0] = AX25_I;
222	frame[0] \|= (ax25->vs << 1);
223	frame[1] = (poll_bit) ? AX25_EPF : 0;
224	frame[1] \|= (ax25->vr << 1);
225	}
226
227	ax25_start_idletimer(ax25);
228
229	ax25_transmit_buffer(ax25, skb, AX25_COMMAND);
230	}
231
232	void ax25_kick(ax25_cb *ax25)
233	{
234	struct sk_buff skb, skbn;
235	int last = 1;
236	unsigned short start, end, next;
237
238	if (ax25->state != AX25_STATE_3 && ax25->state != AX25_STATE_4)
239	return;
240
241	if (ax25->condition & AX25_COND_PEER_RX_BUSY)
242	return;
243
244	if (skb_peek(&ax25->write_queue) == NULL)
245	return;
246
247	start = (skb_peek(&ax25->ack_queue) == NULL) ? ax25->va : ax25->vs;
248	end = (ax25->va + ax25->window) % ax25->modulus;
249
250	if (start == end)
251	return;
252
253	ax25->vs = start;
254
255	/*
256	* Transmit data until either we're out of data to send or
257	* the window is full. Send a poll on the final I frame if
258	* the window is filled.
259	*/
260
261	/*
262	* Dequeue the frame and copy it.
263	*/
264	skb = skb_dequeue(&ax25->write_queue);
265
266	do {
267	if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
268	skb_queue_head(&ax25->write_queue, skb);
269	break;
270	}
271
272	if (skb->sk != NULL)
273	skb_set_owner_w(skbn, skb->sk);
274
275	next = (ax25->vs + 1) % ax25->modulus;
276	last = (next == end);
277
278	/*
279	* Transmit the frame copy.
280	* bke 960114: do not set the Poll bit on the last frame
281	* in DAMA mode.
282	*/
283	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
284	case AX25_PROTO_STD_SIMPLEX:
285	case AX25_PROTO_STD_DUPLEX:
286	ax25_send_iframe(ax25, skbn, (last) ? AX25_POLLON : AX25_POLLOFF);
287	break;
288
289	#ifdef CONFIG_AX25_DAMA_SLAVE
290	case AX25_PROTO_DAMA_SLAVE:
291	ax25_send_iframe(ax25, skbn, AX25_POLLOFF);
292	break;
293	#endif
294	}
295
296	ax25->vs = next;
297
298	/*
299	* Requeue the original data frame.
300	*/
301	skb_queue_tail(&ax25->ack_queue, skb);
302
303	} while (!last && (skb = skb_dequeue(&ax25->write_queue)) != NULL);
304
305	ax25->condition &= ~AX25_COND_ACK_PENDING;
306
307	if (!ax25_t1timer_running(ax25)) {
308	ax25_stop_t3timer(ax25);
309	ax25_calculate_t1(ax25);
310	ax25_start_t1timer(ax25);
311	}
312	}
313
314	void ax25_transmit_buffer(ax25_cb ax25, struct sk_buff skb, int type)
315	{
316	struct sk_buff *skbn;
317	unsigned char *ptr;
318	int headroom;
319
320	if (ax25->ax25_dev == NULL) {
321	ax25_disconnect(ax25, ENETUNREACH);
322	return;
323	}
324
325	headroom = ax25_addr_size(ax25->digipeat);
326
327	if (skb_headroom(skb) < headroom) {
328	if ((skbn = skb_realloc_headroom(skb, headroom)) == NULL) {
329	printk(KERN_CRIT "AX.25: ax25_transmit_buffer - out of memory\n");
330	kfree_skb(skb);
331	return;
332	}
333
334	if (skb->sk != NULL)
335	skb_set_owner_w(skbn, skb->sk);
336
337	kfree_skb(skb);
338	skb = skbn;
339	}
340
341	ptr = skb_push(skb, headroom);
342
343	ax25_addr_build(ptr, &ax25->source_addr, &ax25->dest_addr, ax25->digipeat, type, ax25->modulus);
344
29c4be51	345	ax25_queue_xmit(skb, ax25->ax25_dev->dev);
1da177e4 LT	346	}
	347
	348	/*
	349	* A small shim to dev_queue_xmit to add the KISS control byte, and do
	350	* any packet forwarding in operation.
	351	*/
29c4be51	352	void ax25_queue_xmit(struct sk_buff skb, struct net_device dev)
1da177e4 LT	353	{
	354	unsigned char *ptr;
	355
56cb5156	356	skb->protocol = ax25_type_trans(skb, ax25_fwd_dev(dev));
1da177e4 LT	357
	358	ptr = skb_push(skb, 1);
	359	ptr = 0x00; / KISS */
	360
	361	dev_queue_xmit(skb);
	362	}
	363
	364	int ax25_check_iframes_acked(ax25_cb *ax25, unsigned short nr)
	365	{
	366	if (ax25->vs == nr) {
	367	ax25_frames_acked(ax25, nr);
	368	ax25_calculate_rtt(ax25);
	369	ax25_stop_t1timer(ax25);
	370	ax25_start_t3timer(ax25);
	371	return 1;
	372	} else {
	373	if (ax25->va != nr) {
	374	ax25_frames_acked(ax25, nr);
	375	ax25_calculate_t1(ax25);
	376	ax25_start_t1timer(ax25);
	377	return 1;
	378	}
	379	}
	380	return 0;
	381	}
	382