[linux.git] / net / rose / rose_subr.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/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>

static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);

/*
 *	This routine purges all of the queues of frames.
 */
void rose_clear_queues(struct sock *sk)
{
	skb_queue_purge(&sk->sk_write_queue);
	skb_queue_purge(&rose_sk(sk)->ack_queue);
}

/*
 * This routine purges the input queue of those frames that have been
 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
 * SDL diagram.
 */
void rose_frames_acked(struct sock *sk, unsigned short nr)
{
	struct sk_buff *skb;
	struct rose_sock *rose = rose_sk(sk);

	/*
	 * Remove all the ack-ed frames from the ack queue.
	 */
	if (rose->va != nr) {
		while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
			skb = skb_dequeue(&rose->ack_queue);
			kfree_skb(skb);
			rose->va = (rose->va + 1) % ROSE_MODULUS;
		}
	}
}

void rose_requeue_frames(struct sock *sk)
{
	struct sk_buff *skb, *skb_prev = NULL;

	/*
	 * Requeue all the un-ack-ed frames on the output queue to be picked
	 * up by rose_kick. This arrangement handles the possibility of an
	 * empty output queue.
	 */
	while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
		if (skb_prev == NULL)
			skb_queue_head(&sk->sk_write_queue, skb);
		else
			skb_append(skb_prev, skb, &sk->sk_write_queue);
		skb_prev = skb;
	}
}

/*
 *	Validate that the value of nr is between va and vs. Return true or
 *	false for testing.
 */
int rose_validate_nr(struct sock *sk, unsigned short nr)
{
	struct rose_sock *rose = rose_sk(sk);
	unsigned short vc = rose->va;

	while (vc != rose->vs) {
		if (nr == vc) return 1;
		vc = (vc + 1) % ROSE_MODULUS;
	}

	return nr == rose->vs;
}

/*
 *  This routine is called when the packet layer internally generates a
 *  control frame.
 */
void rose_write_internal(struct sock *sk, int frametype)
{
	struct rose_sock *rose = rose_sk(sk);
	struct sk_buff *skb;
	unsigned char  *dptr;
	unsigned char  lci1, lci2;
	char buffer[100];
	int len, faclen = 0;

	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;

	switch (frametype) {
	case ROSE_CALL_REQUEST:
		len   += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
		faclen = rose_create_facilities(buffer, rose);
		len   += faclen;
		break;
	case ROSE_CALL_ACCEPTED:
	case ROSE_CLEAR_REQUEST:
	case ROSE_RESET_REQUEST:
		len   += 2;
		break;
	}

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

	/*
	 *	Space for AX.25 header and PID.
	 */
	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);

	dptr = skb_put(skb, skb_tailroom(skb));

	lci1 = (rose->lci >> 8) & 0x0F;
	lci2 = (rose->lci >> 0) & 0xFF;

	switch (frametype) {
	case ROSE_CALL_REQUEST:
		*dptr++ = ROSE_GFI | lci1;
		*dptr++ = lci2;
		*dptr++ = frametype;
		*dptr++ = 0xAA;
		memcpy(dptr, &rose->dest_addr,  ROSE_ADDR_LEN);
		dptr   += ROSE_ADDR_LEN;
		memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
		dptr   += ROSE_ADDR_LEN;
		memcpy(dptr, buffer, faclen);
		dptr   += faclen;
		break;

	case ROSE_CALL_ACCEPTED:
		*dptr++ = ROSE_GFI | lci1;
		*dptr++ = lci2;
		*dptr++ = frametype;
		*dptr++ = 0x00;		/* Address length */
		*dptr++ = 0;		/* Facilities length */
		break;

	case ROSE_CLEAR_REQUEST:
		*dptr++ = ROSE_GFI | lci1;
		*dptr++ = lci2;
		*dptr++ = frametype;
		*dptr++ = rose->cause;
		*dptr++ = rose->diagnostic;
		break;

	case ROSE_RESET_REQUEST:
		*dptr++ = ROSE_GFI | lci1;
		*dptr++ = lci2;
		*dptr++ = frametype;
		*dptr++ = ROSE_DTE_ORIGINATED;
		*dptr++ = 0;
		break;

	case ROSE_RR:
	case ROSE_RNR:
		*dptr++ = ROSE_GFI | lci1;
		*dptr++ = lci2;
		*dptr   = frametype;
		*dptr++ |= (rose->vr << 5) & 0xE0;
		break;

	case ROSE_CLEAR_CONFIRMATION:
	case ROSE_RESET_CONFIRMATION:
		*dptr++ = ROSE_GFI | lci1;
		*dptr++ = lci2;
		*dptr++  = frametype;
		break;

	default:
		printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
		kfree_skb(skb);
		return;
	}

	rose_transmit_link(skb, rose->neighbour);
}

int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
{
	unsigned char *frame;

	frame = skb->data;

	*ns = *nr = *q = *d = *m = 0;

	switch (frame[2]) {
	case ROSE_CALL_REQUEST:
	case ROSE_CALL_ACCEPTED:
	case ROSE_CLEAR_REQUEST:
	case ROSE_CLEAR_CONFIRMATION:
	case ROSE_RESET_REQUEST:
	case ROSE_RESET_CONFIRMATION:
		return frame[2];
	default:
		break;
	}

	if ((frame[2] & 0x1F) == ROSE_RR  ||
	    (frame[2] & 0x1F) == ROSE_RNR) {
		*nr = (frame[2] >> 5) & 0x07;
		return frame[2] & 0x1F;
	}

	if ((frame[2] & 0x01) == ROSE_DATA) {
		*q  = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
		*d  = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
		*m  = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
		*nr = (frame[2] >> 5) & 0x07;
		*ns = (frame[2] >> 1) & 0x07;
		return ROSE_DATA;
	}

	return ROSE_ILLEGAL;
}

static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
{
	unsigned char *pt;
	unsigned char l, lg, n = 0;
	int fac_national_digis_received = 0;

	do {
		switch (*p & 0xC0) {
		case 0x00:
			p   += 2;
			n   += 2;
			len -= 2;
			break;

		case 0x40:
			if (*p == FAC_NATIONAL_RAND)
				facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
			p   += 3;
			n   += 3;
			len -= 3;
			break;

		case 0x80:
			p   += 4;
			n   += 4;
			len -= 4;
			break;

		case 0xC0:
			l = p[1];
			if (*p == FAC_NATIONAL_DEST_DIGI) {
				if (!fac_national_digis_received) {
					memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
					facilities->source_ndigis = 1;
				}
			}
			else if (*p == FAC_NATIONAL_SRC_DIGI) {
				if (!fac_national_digis_received) {
					memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
					facilities->dest_ndigis = 1;
				}
			}
			else if (*p == FAC_NATIONAL_FAIL_CALL) {
				memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
			}
			else if (*p == FAC_NATIONAL_FAIL_ADD) {
				memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
			}
			else if (*p == FAC_NATIONAL_DIGIS) {
				fac_national_digis_received = 1;
				facilities->source_ndigis = 0;
				facilities->dest_ndigis   = 0;
				for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
					if (pt[6] & AX25_HBIT)
						memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
					else
						memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
				}
			}
			p   += l + 2;
			n   += l + 2;
			len -= l + 2;
			break;
		}
	} while (*p != 0x00 && len > 0);

	return n;
}

static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
{
	unsigned char l, n = 0;
	char callsign[11];

	do {
		switch (*p & 0xC0) {
		case 0x00:
			p   += 2;
			n   += 2;
			len -= 2;
			break;

		case 0x40:
			p   += 3;
			n   += 3;
			len -= 3;
			break;

		case 0x80:
			p   += 4;
			n   += 4;
			len -= 4;
			break;

		case 0xC0:
			l = p[1];
			if (*p == FAC_CCITT_DEST_NSAP) {
				memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
				memcpy(callsign, p + 12,   l - 10);
				callsign[l - 10] = '\0';
				asc2ax(&facilities->source_call, callsign);
			}
			if (*p == FAC_CCITT_SRC_NSAP) {
				memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
				memcpy(callsign, p + 12, l - 10);
				callsign[l - 10] = '\0';
				asc2ax(&facilities->dest_call, callsign);
			}
			p   += l + 2;
			n   += l + 2;
			len -= l + 2;
			break;
		}
	} while (*p != 0x00 && len > 0);

	return n;
}

int rose_parse_facilities(unsigned char *p,
	struct rose_facilities_struct *facilities)
{
	int facilities_len, len;

	facilities_len = *p++;

	if (facilities_len == 0)
		return 0;

	while (facilities_len > 0) {
		if (*p == 0x00) {
			facilities_len--;
			p++;

			switch (*p) {
			case FAC_NATIONAL:		/* National */
				len = rose_parse_national(p + 1, facilities, facilities_len - 1);
				facilities_len -= len + 1;
				p += len + 1;
				break;

			case FAC_CCITT:		/* CCITT */
				len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
				facilities_len -= len + 1;
				p += len + 1;
				break;

			default:
				printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
				facilities_len--;
				p++;
				break;
			}
		} else
			break;	/* Error in facilities format */
	}

	return 1;
}

static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
{
	unsigned char *p = buffer + 1;
	char *callsign;
	char buf[11];
	int len, nb;

	/* National Facilities */
	if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
		*p++ = 0x00;
		*p++ = FAC_NATIONAL;

		if (rose->rand != 0) {
			*p++ = FAC_NATIONAL_RAND;
			*p++ = (rose->rand >> 8) & 0xFF;
			*p++ = (rose->rand >> 0) & 0xFF;
		}

		/* Sent before older facilities */
		if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
			int maxdigi = 0;
			*p++ = FAC_NATIONAL_DIGIS;
			*p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
			for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
				if (++maxdigi >= ROSE_MAX_DIGIS)
					break;
				memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
				p[6] |= AX25_HBIT;
				p += AX25_ADDR_LEN;
			}
			for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
				if (++maxdigi >= ROSE_MAX_DIGIS)
					break;
				memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
				p[6] &= ~AX25_HBIT;
				p += AX25_ADDR_LEN;
			}
		}

		/* For compatibility */
		if (rose->source_ndigis > 0) {
			*p++ = FAC_NATIONAL_SRC_DIGI;
			*p++ = AX25_ADDR_LEN;
			memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
			p   += AX25_ADDR_LEN;
		}

		/* For compatibility */
		if (rose->dest_ndigis > 0) {
			*p++ = FAC_NATIONAL_DEST_DIGI;
			*p++ = AX25_ADDR_LEN;
			memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
			p   += AX25_ADDR_LEN;
		}
	}

	*p++ = 0x00;
	*p++ = FAC_CCITT;

	*p++ = FAC_CCITT_DEST_NSAP;

	callsign = ax2asc(buf, &rose->dest_call);

	*p++ = strlen(callsign) + 10;
	*p++ = (strlen(callsign) + 9) * 2;		/* ??? */

	*p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
	*p++ = ROSE_ADDR_LEN * 2;
	memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
	p   += ROSE_ADDR_LEN;

	memcpy(p, callsign, strlen(callsign));
	p   += strlen(callsign);

	*p++ = FAC_CCITT_SRC_NSAP;

	callsign = ax2asc(buf, &rose->source_call);

	*p++ = strlen(callsign) + 10;
	*p++ = (strlen(callsign) + 9) * 2;		/* ??? */

	*p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
	*p++ = ROSE_ADDR_LEN * 2;
	memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
	p   += ROSE_ADDR_LEN;

	memcpy(p, callsign, strlen(callsign));
	p   += strlen(callsign);

	len       = p - buffer;
	buffer[0] = len - 1;

	return len;
}

void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
{
	struct rose_sock *rose = rose_sk(sk);

	rose_stop_timer(sk);
	rose_stop_idletimer(sk);

	rose_clear_queues(sk);

	rose->lci   = 0;
	rose->state = ROSE_STATE_0;

	if (cause != -1)
		rose->cause = cause;

	if (diagnostic != -1)
		rose->diagnostic = diagnostic;

	sk->sk_state     = TCP_CLOSE;
	sk->sk_err       = reason;
	sk->sk_shutdown |= SEND_SHUTDOWN;

	if (!sock_flag(sk, SOCK_DEAD)) {
		sk->sk_state_change(sk);
		sock_set_flag(sk, SOCK_DEAD);
	}
}
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>
1da177e4 LT	14	#include <linux/timer.h>
	15	#include <linux/string.h>
	16	#include <linux/sockios.h>
	17	#include <linux/net.h>
	18	#include <net/ax25.h>
	19	#include <linux/inet.h>
	20	#include <linux/netdevice.h>
	21	#include <linux/skbuff.h>
	22	#include <net/sock.h>
c752f073	23	#include <net/tcp_states.h>
1da177e4 LT	24	#include <asm/system.h>
	25	#include <linux/fcntl.h>
	26	#include <linux/mm.h>
	27	#include <linux/interrupt.h>
	28	#include <net/rose.h>
	29
	30	static int rose_create_facilities(unsigned char buffer, struct rose_sock rose);
	31
	32	/*
	33	* This routine purges all of the queues of frames.
	34	*/
	35	void rose_clear_queues(struct sock *sk)
	36	{
	37	skb_queue_purge(&sk->sk_write_queue);
	38	skb_queue_purge(&rose_sk(sk)->ack_queue);
	39	}
	40
	41	/*
	42	* This routine purges the input queue of those frames that have been
	43	* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
	44	* SDL diagram.
	45	*/
	46	void rose_frames_acked(struct sock *sk, unsigned short nr)
	47	{
	48	struct sk_buff *skb;
	49	struct rose_sock *rose = rose_sk(sk);
	50
	51	/*
	52	* Remove all the ack-ed frames from the ack queue.
	53	*/
	54	if (rose->va != nr) {
	55	while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
	56	skb = skb_dequeue(&rose->ack_queue);
	57	kfree_skb(skb);
	58	rose->va = (rose->va + 1) % ROSE_MODULUS;
	59	}
	60	}
	61	}
	62
	63	void rose_requeue_frames(struct sock *sk)
	64	{
	65	struct sk_buff skb, skb_prev = NULL;
	66
	67	/*
	68	* Requeue all the un-ack-ed frames on the output queue to be picked
	69	* up by rose_kick. This arrangement handles the possibility of an
	70	* empty output queue.
	71	*/
	72	while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
	73	if (skb_prev == NULL)
	74	skb_queue_head(&sk->sk_write_queue, skb);
	75	else
8728b834	76	skb_append(skb_prev, skb, &sk->sk_write_queue);
1da177e4 LT	77	skb_prev = skb;
	78	}
	79	}
	80
	81	/*
	82	* Validate that the value of nr is between va and vs. Return true or
	83	* false for testing.
	84	*/
	85	int rose_validate_nr(struct sock *sk, unsigned short nr)
	86	{
	87	struct rose_sock *rose = rose_sk(sk);
	88	unsigned short vc = rose->va;
	89
	90	while (vc != rose->vs) {
	91	if (nr == vc) return 1;
	92	vc = (vc + 1) % ROSE_MODULUS;
	93	}
	94
	95	return nr == rose->vs;
	96	}
	97
	98	/*
	99	* This routine is called when the packet layer internally generates a
	100	* control frame.
	101	*/
	102	void rose_write_internal(struct sock *sk, int frametype)
	103	{
	104	struct rose_sock *rose = rose_sk(sk);
	105	struct sk_buff *skb;
	106	unsigned char *dptr;
	107	unsigned char lci1, lci2;
	108	char buffer[100];
	109	int len, faclen = 0;
	110
	111	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
	112
	113	switch (frametype) {
	114	case ROSE_CALL_REQUEST:
	115	len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
	116	faclen = rose_create_facilities(buffer, rose);
	117	len += faclen;
	118	break;
	119	case ROSE_CALL_ACCEPTED:
	120	case ROSE_CLEAR_REQUEST:
	121	case ROSE_RESET_REQUEST:
	122	len += 2;
	123	break;
	124	}
	125
	126	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
	127	return;
	128
	129	/*
	130	* Space for AX.25 header and PID.
	131	*/
	132	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);
	133
	134	dptr = skb_put(skb, skb_tailroom(skb));
	135
	136	lci1 = (rose->lci >> 8) & 0x0F;
	137	lci2 = (rose->lci >> 0) & 0xFF;
	138
	139	switch (frametype) {
	140	case ROSE_CALL_REQUEST:
141	*dptr++ = ROSE_GFI \| lci1;
142	*dptr++ = lci2;
143	*dptr++ = frametype;
144	*dptr++ = 0xAA;
145	memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN);
146	dptr += ROSE_ADDR_LEN;
147	memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
148	dptr += ROSE_ADDR_LEN;
149	memcpy(dptr, buffer, faclen);
150	dptr += faclen;
151	break;
152
153	case ROSE_CALL_ACCEPTED:
154	*dptr++ = ROSE_GFI \| lci1;
155	*dptr++ = lci2;
156	*dptr++ = frametype;
157	dptr++ = 0x00; / Address length */
158	dptr++ = 0; / Facilities length */
159	break;
160
161	case ROSE_CLEAR_REQUEST:
162	*dptr++ = ROSE_GFI \| lci1;
163	*dptr++ = lci2;
164	*dptr++ = frametype;
165	*dptr++ = rose->cause;
166	*dptr++ = rose->diagnostic;
167	break;
168
169	case ROSE_RESET_REQUEST:
170	*dptr++ = ROSE_GFI \| lci1;
171	*dptr++ = lci2;
172	*dptr++ = frametype;
173	*dptr++ = ROSE_DTE_ORIGINATED;
174	*dptr++ = 0;
175	break;
176
177	case ROSE_RR:
178	case ROSE_RNR:
179	*dptr++ = ROSE_GFI \| lci1;
180	*dptr++ = lci2;
181	*dptr = frametype;
182	*dptr++ \|= (rose->vr << 5) & 0xE0;
183	break;
184
185	case ROSE_CLEAR_CONFIRMATION:
186	case ROSE_RESET_CONFIRMATION:
187	*dptr++ = ROSE_GFI \| lci1;
188	*dptr++ = lci2;
189	*dptr++ = frametype;
190	break;
191
192	default:
193	printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
194	kfree_skb(skb);
195	return;
196	}
197
198	rose_transmit_link(skb, rose->neighbour);
199	}
200
201	int rose_decode(struct sk_buff skb, int ns, int nr, int q, int d, int m)
202	{
203	unsigned char *frame;
204
205	frame = skb->data;
206
207	ns = nr = q = d = *m = 0;
208
209	switch (frame[2]) {
210	case ROSE_CALL_REQUEST:
211	case ROSE_CALL_ACCEPTED:
212	case ROSE_CLEAR_REQUEST:
213	case ROSE_CLEAR_CONFIRMATION:
214	case ROSE_RESET_REQUEST:
215	case ROSE_RESET_CONFIRMATION:
216	return frame[2];
217	default:
218	break;
219	}
220
221	if ((frame[2] & 0x1F) == ROSE_RR \|\|
222	(frame[2] & 0x1F) == ROSE_RNR) {
223	*nr = (frame[2] >> 5) & 0x07;
224	return frame[2] & 0x1F;
225	}
226
227	if ((frame[2] & 0x01) == ROSE_DATA) {
228	*q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
229	*d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
230	*m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
231	*nr = (frame[2] >> 5) & 0x07;
232	*ns = (frame[2] >> 1) & 0x07;
233	return ROSE_DATA;
234	}
235
236	return ROSE_ILLEGAL;
237	}
238
239	static int rose_parse_national(unsigned char p, struct rose_facilities_struct facilities, int len)
240	{
241	unsigned char *pt;
242	unsigned char l, lg, n = 0;
243	int fac_national_digis_received = 0;
244
245	do {
246	switch (*p & 0xC0) {
247	case 0x00:
248	p += 2;
249	n += 2;
250	len -= 2;
251	break;
252
253	case 0x40:
254	if (*p == FAC_NATIONAL_RAND)
255	facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
256	p += 3;
257	n += 3;
258	len -= 3;
259	break;
260
261	case 0x80:
262	p += 4;
263	n += 4;
264	len -= 4;
265	break;
266
267	case 0xC0:
268	l = p[1];
269	if (*p == FAC_NATIONAL_DEST_DIGI) {
270	if (!fac_national_digis_received) {
271	memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
272	facilities->source_ndigis = 1;
273	}
274	}
275	else if (*p == FAC_NATIONAL_SRC_DIGI) {
276	if (!fac_national_digis_received) {
277	memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
278	facilities->dest_ndigis = 1;
279	}
280	}
281	else if (*p == FAC_NATIONAL_FAIL_CALL) {
282	memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
283	}
284	else if (*p == FAC_NATIONAL_FAIL_ADD) {
285	memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
286	}
287	else if (*p == FAC_NATIONAL_DIGIS) {
288	fac_national_digis_received = 1;
289	facilities->source_ndigis = 0;
290	facilities->dest_ndigis = 0;
291	for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
292	if (pt[6] & AX25_HBIT)
293	memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
294	else
295	memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
296	}
297	}
298	p += l + 2;
299	n += l + 2;
300	len -= l + 2;
301	break;
302	}
303	} while (*p != 0x00 && len > 0);
304
305	return n;
306	}
307
308	static int rose_parse_ccitt(unsigned char p, struct rose_facilities_struct facilities, int len)
309	{
310	unsigned char l, n = 0;
311	char callsign[11];
312
313	do {
314	switch (*p & 0xC0) {
315	case 0x00:
316	p += 2;
317	n += 2;
318	len -= 2;
319	break;
320
321	case 0x40:
322	p += 3;
323	n += 3;
324	len -= 3;
325	break;
326
327	case 0x80:
328	p += 4;
329	n += 4;
330	len -= 4;
331	break;
332
333	case 0xC0:
334	l = p[1];
335	if (*p == FAC_CCITT_DEST_NSAP) {
336	memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
337	memcpy(callsign, p + 12, l - 10);
338	callsign[l - 10] = '\0';
baed16a7	339	asc2ax(&facilities->source_call, callsign);
1da177e4 LT	340	}
	341	if (*p == FAC_CCITT_SRC_NSAP) {
	342	memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
	343	memcpy(callsign, p + 12, l - 10);
	344	callsign[l - 10] = '\0';
baed16a7	345	asc2ax(&facilities->dest_call, callsign);
1da177e4 LT	346	}
	347	p += l + 2;
	348	n += l + 2;
	349	len -= l + 2;
	350	break;
	351	}
	352	} while (*p != 0x00 && len > 0);
	353
	354	return n;
	355	}
	356
	357	int rose_parse_facilities(unsigned char *p,
	358	struct rose_facilities_struct *facilities)
	359	{
	360	int facilities_len, len;
	361
	362	facilities_len = *p++;
	363
	364	if (facilities_len == 0)
	365	return 0;
	366
	367	while (facilities_len > 0) {
	368	if (*p == 0x00) {
	369	facilities_len--;
	370	p++;
	371
	372	switch (*p) {
	373	case FAC_NATIONAL: /* National */
	374	len = rose_parse_national(p + 1, facilities, facilities_len - 1);
	375	facilities_len -= len + 1;
	376	p += len + 1;
	377	break;
	378
	379	case FAC_CCITT: /* CCITT */
	380	len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
	381	facilities_len -= len + 1;
	382	p += len + 1;
	383	break;
	384
	385	default:
	386	printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
	387	facilities_len--;
	388	p++;
	389	break;
	390	}
	391	} else
	392	break; /* Error in facilities format */
	393	}
	394
	395	return 1;
	396	}
	397
	398	static int rose_create_facilities(unsigned char buffer, struct rose_sock rose)
	399	{
	400	unsigned char *p = buffer + 1;
	401	char *callsign;
f75268cd	402	char buf[11];
1da177e4 LT	403	int len, nb;
	404
	405	/* National Facilities */
	406	if (rose->rand != 0 \|\| rose->source_ndigis == 1 \|\| rose->dest_ndigis == 1) {
	407	*p++ = 0x00;
	408	*p++ = FAC_NATIONAL;
	409
	410	if (rose->rand != 0) {
	411	*p++ = FAC_NATIONAL_RAND;
	412	*p++ = (rose->rand >> 8) & 0xFF;
	413	*p++ = (rose->rand >> 0) & 0xFF;
	414	}
	415
	416	/* Sent before older facilities */
	417	if ((rose->source_ndigis > 0) \|\| (rose->dest_ndigis > 0)) {
	418	int maxdigi = 0;
	419	*p++ = FAC_NATIONAL_DIGIS;
	420	p++ = AX25_ADDR_LEN (rose->source_ndigis + rose->dest_ndigis);
	421	for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
	422	if (++maxdigi >= ROSE_MAX_DIGIS)
	423	break;
	424	memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
	425	p[6] \|= AX25_HBIT;
	426	p += AX25_ADDR_LEN;
	427	}
	428	for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
	429	if (++maxdigi >= ROSE_MAX_DIGIS)
	430	break;
	431	memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
	432	p[6] &= ~AX25_HBIT;
	433	p += AX25_ADDR_LEN;
	434	}
	435	}
	436
	437	/* For compatibility */
	438	if (rose->source_ndigis > 0) {
	439	*p++ = FAC_NATIONAL_SRC_DIGI;
	440	*p++ = AX25_ADDR_LEN;
	441	memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
	442	p += AX25_ADDR_LEN;
	443	}
	444
	445	/* For compatibility */
	446	if (rose->dest_ndigis > 0) {
	447	*p++ = FAC_NATIONAL_DEST_DIGI;
	448	*p++ = AX25_ADDR_LEN;
	449	memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
	450	p += AX25_ADDR_LEN;
	451	}
	452	}
	453
	454	*p++ = 0x00;
	455	*p++ = FAC_CCITT;
	456
	457	*p++ = FAC_CCITT_DEST_NSAP;
	458
f75268cd	459	callsign = ax2asc(buf, &rose->dest_call);
1da177e4 LT	460
	461	*p++ = strlen(callsign) + 10;
	462	p++ = (strlen(callsign) + 9) 2; /* ??? */
	463
	464	p++ = 0x47; p++ = 0x00; *p++ = 0x11;
	465	p++ = ROSE_ADDR_LEN 2;
	466	memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
	467	p += ROSE_ADDR_LEN;
	468
	469	memcpy(p, callsign, strlen(callsign));
	470	p += strlen(callsign);
	471
	472	*p++ = FAC_CCITT_SRC_NSAP;
	473
f75268cd	474	callsign = ax2asc(buf, &rose->source_call);
1da177e4 LT	475
	476	*p++ = strlen(callsign) + 10;
	477	p++ = (strlen(callsign) + 9) 2; /* ??? */
	478
	479	p++ = 0x47; p++ = 0x00; *p++ = 0x11;
	480	p++ = ROSE_ADDR_LEN 2;
	481	memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
	482	p += ROSE_ADDR_LEN;
	483
	484	memcpy(p, callsign, strlen(callsign));
	485	p += strlen(callsign);
	486
	487	len = p - buffer;
	488	buffer[0] = len - 1;
	489
	490	return len;
	491	}
	492
	493	void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
	494	{
	495	struct rose_sock *rose = rose_sk(sk);
	496
	497	rose_stop_timer(sk);
	498	rose_stop_idletimer(sk);
	499
	500	rose_clear_queues(sk);
	501
	502	rose->lci = 0;
	503	rose->state = ROSE_STATE_0;
	504
	505	if (cause != -1)
	506	rose->cause = cause;
	507
	508	if (diagnostic != -1)
	509	rose->diagnostic = diagnostic;
	510
	511	sk->sk_state = TCP_CLOSE;
	512	sk->sk_err = reason;
	513	sk->sk_shutdown \|= SEND_SHUTDOWN;
	514
	515	if (!sock_flag(sk, SOCK_DEAD)) {
	516	sk->sk_state_change(sk);
	517	sock_set_flag(sk, SOCK_DEAD);
	518	}
	519	}