net/ax25/ax25_subr.c

19 #include <net/ax25.h>
33 void ax25_clear_queues(ax25_cb *ax25)
35 	skb_queue_purge(&ax25->write_queue);
36 	skb_queue_purge(&ax25->ack_queue);
37 	skb_queue_purge(&ax25->reseq_queue);
38 	skb_queue_purge(&ax25->frag_queue);
46 void ax25_frames_acked(ax25_cb *ax25, unsigned short nr)
53 	if (ax25->va != nr) {
54 		while (skb_peek(&ax25->ack_queue) != NULL && ax25->va != nr) {
55 			skb = skb_dequeue(&ax25->ack_queue);
57 			ax25->va = (ax25->va + 1) % ax25->modulus;
62 void ax25_requeue_frames(ax25_cb *ax25)
71 	while ((skb = skb_dequeue_tail(&ax25->ack_queue)) != NULL)
72 		skb_queue_head(&ax25->write_queue, skb);
79 int ax25_validate_nr(ax25_cb *ax25, unsigned short nr)
81 	unsigned short vc = ax25->va;
83 	while (vc != ax25->vs) {
85 		vc = (vc + 1) % ax25->modulus;
88 	if (nr == ax25->vs) return 1;
97 int ax25_decode(ax25_cb *ax25, struct sk_buff *skb, int *ns, int *nr, int *pf)
105 	if (ax25->modulus == AX25_MODULUS) {
147 void ax25_send_control(ax25_cb *ax25, int frametype, int poll_bit, int type)
152 	if ((skb = alloc_skb(ax25->ax25_dev->dev->hard_header_len + 2, GFP_ATOMIC)) == NULL)
155 	skb_reserve(skb, ax25->ax25_dev->dev->hard_header_len);
160 	if (ax25->modulus == AX25_MODULUS) {
165 			*dptr |= (ax25->vr << 5);
174 			dptr[1] = (ax25->vr << 1);
179 	ax25_transmit_buffer(ax25, skb, type);
220 void ax25_calculate_t1(ax25_cb *ax25)
224 	switch (ax25->backoff) {
229 		t += 2 * ax25->n2count;
233 		for (n = 0; n < ax25->n2count; n++)
239 	ax25->t1 = t * ax25->rtt;
245 void ax25_calculate_rtt(ax25_cb *ax25)
247 	if (ax25->backoff == 0)
250 	if (ax25_t1timer_running(ax25) && ax25->n2count == 0)
251 		ax25->rtt = (9 * ax25->rtt + ax25->t1 - ax25_display_timer(&ax25->t1timer)) / 10;
253 	if (ax25->rtt < AX25_T1CLAMPLO)
254 		ax25->rtt = AX25_T1CLAMPLO;
256 	if (ax25->rtt > AX25_T1CLAMPHI)
257 		ax25->rtt = AX25_T1CLAMPHI;
260 void ax25_disconnect(ax25_cb *ax25, int reason)
262 	ax25_clear_queues(ax25);
265 		timer_delete_sync(&ax25->timer);
266 		timer_delete_sync(&ax25->t1timer);
267 		timer_delete_sync(&ax25->t2timer);
268 		timer_delete_sync(&ax25->t3timer);
269 		timer_delete_sync(&ax25->idletimer);
271 		if (ax25->sk && !sock_flag(ax25->sk, SOCK_DESTROY))
272 			ax25_stop_heartbeat(ax25);
273 		ax25_stop_t1timer(ax25);
274 		ax25_stop_t2timer(ax25);
275 		ax25_stop_t3timer(ax25);
276 		ax25_stop_idletimer(ax25);
279 	ax25->state = AX25_STATE_0;
281 	ax25_link_failed(ax25, reason);
283 	if (ax25->sk != NULL) {
285 		bh_lock_sock(ax25->sk);
286 		ax25->sk->sk_state     = TCP_CLOSE;
287 		ax25->sk->sk_err       = reason;
288 		ax25->sk->sk_shutdown |= SEND_SHUTDOWN;
289 		if (!sock_flag(ax25->sk, SOCK_DEAD)) {
290 			ax25->sk->sk_state_change(ax25->sk);
291 			sock_set_flag(ax25->sk, SOCK_DEAD);
293 		bh_unlock_sock(ax25->sk);