[net-next-2.6.git] / net / x25 / x25_facilities.c

/*
 *	X.25 Packet Layer release 002
 *
 *	This is ALPHA test software. This code may break your machine,
 *	randomly fail to work with new releases, misbehave and/or generally
 *	screw up. It might even work.
 *
 *	This code REQUIRES 2.1.15 or higher
 *
 *	This module:
 *		This module 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.
 *
 *	History
 *	X.25 001	Split from x25_subr.c
 *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities
 *					  negotiation.
 *	apr/14/05	Shaun Pereira - Allow fast select with no restriction
 *					on response.
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/x25.h>

/*
 * Parse a set of facilities into the facilities structures. Unrecognised
 *	facilities are written to the debug log file.
 */
int x25_parse_facilities(struct sk_buff *skb, struct x25_facilities *facilities,
		struct x25_dte_facilities *dte_facs, unsigned long *vc_fac_mask)
{
	unsigned char *p = skb->data;
	unsigned int len;

	*vc_fac_mask = 0;

	/*
	 * The kernel knows which facilities were set on an incoming call but
	 * currently this information is not available to userspace.  Here we
	 * give userspace who read incoming call facilities 0 length to indicate
	 * it wasn't set.
	 */
	dte_facs->calling_len = 0;
	dte_facs->called_len = 0;
	memset(dte_facs->called_ae, '\0', sizeof(dte_facs->called_ae));
	memset(dte_facs->calling_ae, '\0', sizeof(dte_facs->calling_ae));

	if (skb->len < 1)
		return 0;

	len = *p++;

	if (len >= skb->len)
		return -1;

	while (len > 0) {
		switch (*p & X25_FAC_CLASS_MASK) {
		case X25_FAC_CLASS_A:
			switch (*p) {
			case X25_FAC_REVERSE:
				if((p[1] & 0x81) == 0x81) {
					facilities->reverse = p[1] & 0x81;
					*vc_fac_mask |= X25_MASK_REVERSE;
					break;
				}

				if((p[1] & 0x01) == 0x01) {
					facilities->reverse = p[1] & 0x01;
					*vc_fac_mask |= X25_MASK_REVERSE;
					break;
				}

				if((p[1] & 0x80) == 0x80) {
					facilities->reverse = p[1] & 0x80;
					*vc_fac_mask |= X25_MASK_REVERSE;
					break;
				}

				if(p[1] == 0x00) {
					facilities->reverse
						= X25_DEFAULT_REVERSE;
					*vc_fac_mask |= X25_MASK_REVERSE;
					break;
				}

			case X25_FAC_THROUGHPUT:
				facilities->throughput = p[1];
				*vc_fac_mask |= X25_MASK_THROUGHPUT;
				break;
			case X25_MARKER:
				break;
			default:
				printk(KERN_DEBUG "X.25: unknown facility "
				       "%02X, value %02X\n",
				       p[0], p[1]);
				break;
			}
			p   += 2;
			len -= 2;
			break;
		case X25_FAC_CLASS_B:
			switch (*p) {
			case X25_FAC_PACKET_SIZE:
				facilities->pacsize_in  = p[1];
				facilities->pacsize_out = p[2];
				*vc_fac_mask |= X25_MASK_PACKET_SIZE;
				break;
			case X25_FAC_WINDOW_SIZE:
				facilities->winsize_in  = p[1];
				facilities->winsize_out = p[2];
				*vc_fac_mask |= X25_MASK_WINDOW_SIZE;
				break;
			default:
				printk(KERN_DEBUG "X.25: unknown facility "
				       "%02X, values %02X, %02X\n",
				       p[0], p[1], p[2]);
				break;
			}
			p   += 3;
			len -= 3;
			break;
		case X25_FAC_CLASS_C:
			printk(KERN_DEBUG "X.25: unknown facility %02X, "
			       "values %02X, %02X, %02X\n",
			       p[0], p[1], p[2], p[3]);
			p   += 4;
			len -= 4;
			break;
		case X25_FAC_CLASS_D:
			switch (*p) {
			case X25_FAC_CALLING_AE:
				if (p[1] > X25_MAX_DTE_FACIL_LEN || p[1] <= 1)
					return 0;
				dte_facs->calling_len = p[2];
				memcpy(dte_facs->calling_ae, &p[3], p[1] - 1);
				*vc_fac_mask |= X25_MASK_CALLING_AE;
				break;
			case X25_FAC_CALLED_AE:
				if (p[1] > X25_MAX_DTE_FACIL_LEN || p[1] <= 1)
					return 0;
				dte_facs->called_len = p[2];
				memcpy(dte_facs->called_ae, &p[3], p[1] - 1);
				*vc_fac_mask |= X25_MASK_CALLED_AE;
				break;
			default:
				printk(KERN_DEBUG "X.25: unknown facility %02X,"
					"length %d, values %02X, %02X, "
					"%02X, %02X\n",
					p[0], p[1], p[2], p[3], p[4], p[5]);
				break;
			}
			len -= p[1] + 2;
			p += p[1] + 2;
			break;
		}
	}

	return p - skb->data;
}

/*
 *	Create a set of facilities.
 */
int x25_create_facilities(unsigned char *buffer,
		struct x25_facilities *facilities,
		struct x25_dte_facilities *dte_facs, unsigned long facil_mask)
{
	unsigned char *p = buffer + 1;
	int len;

	if (!facil_mask) {
		/*
		 * Length of the facilities field in call_req or
		 * call_accept packets
		 */
		buffer[0] = 0;
		len = 1; /* 1 byte for the length field */
		return len;
	}

	if (facilities->reverse && (facil_mask & X25_MASK_REVERSE)) {
		*p++ = X25_FAC_REVERSE;
		*p++ = facilities->reverse;
	}

	if (facilities->throughput && (facil_mask & X25_MASK_THROUGHPUT)) {
		*p++ = X25_FAC_THROUGHPUT;
		*p++ = facilities->throughput;
	}

	if ((facilities->pacsize_in || facilities->pacsize_out) &&
	    (facil_mask & X25_MASK_PACKET_SIZE)) {
		*p++ = X25_FAC_PACKET_SIZE;
		*p++ = facilities->pacsize_in ? : facilities->pacsize_out;
		*p++ = facilities->pacsize_out ? : facilities->pacsize_in;
	}

	if ((facilities->winsize_in || facilities->winsize_out) &&
	    (facil_mask & X25_MASK_WINDOW_SIZE)) {
		*p++ = X25_FAC_WINDOW_SIZE;
		*p++ = facilities->winsize_in ? : facilities->winsize_out;
		*p++ = facilities->winsize_out ? : facilities->winsize_in;
	}

	if (facil_mask & (X25_MASK_CALLING_AE|X25_MASK_CALLED_AE)) {
		*p++ = X25_MARKER;
		*p++ = X25_DTE_SERVICES;
	}

	if (dte_facs->calling_len && (facil_mask & X25_MASK_CALLING_AE)) {
		unsigned bytecount = (dte_facs->calling_len + 1) >> 1;
		*p++ = X25_FAC_CALLING_AE;
		*p++ = 1 + bytecount;
		*p++ = dte_facs->calling_len;
		memcpy(p, dte_facs->calling_ae, bytecount);
		p += bytecount;
	}

	if (dte_facs->called_len && (facil_mask & X25_MASK_CALLED_AE)) {
		unsigned bytecount = (dte_facs->called_len % 2) ?
		dte_facs->called_len / 2 + 1 :
		dte_facs->called_len / 2;
		*p++ = X25_FAC_CALLED_AE;
		*p++ = 1 + bytecount;
		*p++ = dte_facs->called_len;
		memcpy(p, dte_facs->called_ae, bytecount);
		p+=bytecount;
	}

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

	return len;
}

/*
 *	Try to reach a compromise on a set of facilities.
 *
 *	The only real problem is with reverse charging.
 */
int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
		struct x25_facilities *new, struct x25_dte_facilities *dte)
{
	struct x25_sock *x25 = x25_sk(sk);
	struct x25_facilities *ours = &x25->facilities;
	struct x25_facilities theirs;
	int len;

	memset(&theirs, 0, sizeof(theirs));
	memcpy(new, ours, sizeof(*new));

	len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);
	if (len < 0)
		return len;

	/*
	 *	They want reverse charging, we won't accept it.
	 */
	if ((theirs.reverse & 0x01 ) && (ours->reverse & 0x01)) {
		SOCK_DEBUG(sk, "X.25: rejecting reverse charging request\n");
		return -1;
	}

	new->reverse = theirs.reverse;

	if (theirs.throughput) {
		int theirs_in =  theirs.throughput & 0x0f;
		int theirs_out = theirs.throughput & 0xf0;
		int ours_in  = ours->throughput & 0x0f;
		int ours_out = ours->throughput & 0xf0;
		if (!ours_in || theirs_in < ours_in) {
			SOCK_DEBUG(sk, "X.25: inbound throughput negotiated\n");
			new->throughput = (new->throughput & 0xf0) | theirs_in;
		}
		if (!ours_out || theirs_out < ours_out) {
			SOCK_DEBUG(sk,
				"X.25: outbound throughput negotiated\n");
			new->throughput = (new->throughput & 0x0f) | theirs_out;
		}
	}

	if (theirs.pacsize_in && theirs.pacsize_out) {
		if (theirs.pacsize_in < ours->pacsize_in) {
			SOCK_DEBUG(sk, "X.25: packet size inwards negotiated down\n");
			new->pacsize_in = theirs.pacsize_in;
		}
		if (theirs.pacsize_out < ours->pacsize_out) {
			SOCK_DEBUG(sk, "X.25: packet size outwards negotiated down\n");
			new->pacsize_out = theirs.pacsize_out;
		}
	}

	if (theirs.winsize_in && theirs.winsize_out) {
		if (theirs.winsize_in < ours->winsize_in) {
			SOCK_DEBUG(sk, "X.25: window size inwards negotiated down\n");
			new->winsize_in = theirs.winsize_in;
		}
		if (theirs.winsize_out < ours->winsize_out) {
			SOCK_DEBUG(sk, "X.25: window size outwards negotiated down\n");
			new->winsize_out = theirs.winsize_out;
		}
	}

	return len;
}

/*
 *	Limit values of certain facilities according to the capability of the
 *      currently attached x25 link.
 */
void x25_limit_facilities(struct x25_facilities *facilities,
			  struct x25_neigh *nb)
{

	if (!nb->extended) {
		if (facilities->winsize_in  > 7) {
			printk(KERN_DEBUG "X.25: incoming winsize limited to 7\n");
			facilities->winsize_in = 7;
		}
		if (facilities->winsize_out > 7) {
			facilities->winsize_out = 7;
			printk( KERN_DEBUG "X.25: outgoing winsize limited to 7\n");
		}
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* X.25 Packet Layer release 002
	3	*
	4	* This is ALPHA test software. This code may break your machine,
	5	* randomly fail to work with new releases, misbehave and/or generally
f8e1d201	6	* screw up. It might even work.
1da177e4 LT	7	*
	8	* This code REQUIRES 2.1.15 or higher
	9	*
	10	* This module:
	11	* This module is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*
	16	* History
	17	* X.25 001 Split from x25_subr.c
f8e1d201	18	* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
1da177e4	19	* negotiation.
ebc3f64b SP	20	* apr/14/05 Shaun Pereira - Allow fast select with no restriction
ebc3f64b SP	21	* on response.
1da177e4 LT	22	*/
	23
	24	#include <linux/kernel.h>
	25	#include <linux/string.h>
	26	#include <linux/skbuff.h>
	27	#include <net/sock.h>
	28	#include <net/x25.h>
	29
	30	/*
a64b7b93	31	* Parse a set of facilities into the facilities structures. Unrecognised
1da177e4 LT	32	* facilities are written to the debug log file.
1da177e4 LT	33	*/
a64b7b93 SP	34	int x25_parse_facilities(struct sk_buff skb, struct x25_facilities facilities,
a64b7b93 SP	35	struct x25_dte_facilities dte_facs, unsigned long vc_fac_mask)
1da177e4 LT	36	{
1da177e4 LT	37	unsigned char *p = skb->data;
f5eb917b	38	unsigned int len;
1da177e4 LT	39
	40	*vc_fac_mask = 0;
	41
a64b7b93 SP	42	/*
	43	* The kernel knows which facilities were set on an incoming call but
	44	* currently this information is not available to userspace. Here we
	45	* give userspace who read incoming call facilities 0 length to indicate
	46	* it wasn't set.
	47	*/
	48	dte_facs->calling_len = 0;
	49	dte_facs->called_len = 0;
	50	memset(dte_facs->called_ae, '\0', sizeof(dte_facs->called_ae));
	51	memset(dte_facs->calling_ae, '\0', sizeof(dte_facs->calling_ae));
	52
f5eb917b JH	53	if (skb->len < 1)
	54	return 0;
	55
	56	len = *p++;
	57
	58	if (len >= skb->len)
	59	return -1;
	60
1da177e4 LT	61	while (len > 0) {
	62	switch (*p & X25_FAC_CLASS_MASK) {
	63	case X25_FAC_CLASS_A:
	64	switch (*p) {
	65	case X25_FAC_REVERSE:
ebc3f64b SP	66	if((p[1] & 0x81) == 0x81) {
	67	facilities->reverse = p[1] & 0x81;
	68	*vc_fac_mask \|= X25_MASK_REVERSE;
	69	break;
	70	}
	71
	72	if((p[1] & 0x01) == 0x01) {
	73	facilities->reverse = p[1] & 0x01;
	74	*vc_fac_mask \|= X25_MASK_REVERSE;
	75	break;
	76	}
	77
	78	if((p[1] & 0x80) == 0x80) {
	79	facilities->reverse = p[1] & 0x80;
	80	*vc_fac_mask \|= X25_MASK_REVERSE;
	81	break;
	82	}
	83
	84	if(p[1] == 0x00) {
	85	facilities->reverse
	86	= X25_DEFAULT_REVERSE;
	87	*vc_fac_mask \|= X25_MASK_REVERSE;
	88	break;
	89	}
	90
1da177e4 LT	91	case X25_FAC_THROUGHPUT:
	92	facilities->throughput = p[1];
	93	*vc_fac_mask \|= X25_MASK_THROUGHPUT;
	94	break;
a64b7b93 SP	95	case X25_MARKER:
a64b7b93 SP	96	break;
1da177e4 LT	97	default:
	98	printk(KERN_DEBUG "X.25: unknown facility "
	99	"%02X, value %02X\n",
	100	p[0], p[1]);
	101	break;
	102	}
	103	p += 2;
	104	len -= 2;
	105	break;
	106	case X25_FAC_CLASS_B:
	107	switch (*p) {
	108	case X25_FAC_PACKET_SIZE:
	109	facilities->pacsize_in = p[1];
	110	facilities->pacsize_out = p[2];
	111	*vc_fac_mask \|= X25_MASK_PACKET_SIZE;
	112	break;
	113	case X25_FAC_WINDOW_SIZE:
	114	facilities->winsize_in = p[1];
	115	facilities->winsize_out = p[2];
	116	*vc_fac_mask \|= X25_MASK_WINDOW_SIZE;
	117	break;
	118	default:
	119	printk(KERN_DEBUG "X.25: unknown facility "
	120	"%02X, values %02X, %02X\n",
	121	p[0], p[1], p[2]);
	122	break;
	123	}
	124	p += 3;
	125	len -= 3;
	126	break;
	127	case X25_FAC_CLASS_C:
	128	printk(KERN_DEBUG "X.25: unknown facility %02X, "
	129	"values %02X, %02X, %02X\n",
	130	p[0], p[1], p[2], p[3]);
	131	p += 4;
	132	len -= 4;
	133	break;
	134	case X25_FAC_CLASS_D:
a64b7b93	135	switch (*p) {
f8e1d201	136	case X25_FAC_CALLING_AE:
a6331d6f	137	if (p[1] > X25_MAX_DTE_FACIL_LEN \|\| p[1] <= 1)
a6331d6f	138	return 0;
a64b7b93 SP	139	dte_facs->calling_len = p[2];
	140	memcpy(dte_facs->calling_ae, &p[3], p[1] - 1);
	141	*vc_fac_mask \|= X25_MASK_CALLING_AE;
	142	break;
	143	case X25_FAC_CALLED_AE:
a6331d6f	144	if (p[1] > X25_MAX_DTE_FACIL_LEN \|\| p[1] <= 1)
a6331d6f	145	return 0;
a64b7b93 SP	146	dte_facs->called_len = p[2];
	147	memcpy(dte_facs->called_ae, &p[3], p[1] - 1);
	148	*vc_fac_mask \|= X25_MASK_CALLED_AE;
	149	break;
	150	default:
	151	printk(KERN_DEBUG "X.25: unknown facility %02X,"
	152	"length %d, values %02X, %02X, "
	153	"%02X, %02X\n",
	154	p[0], p[1], p[2], p[3], p[4], p[5]);
	155	break;
	156	}
1da177e4	157	len -= p[1] + 2;
a64b7b93	158	p += p[1] + 2;
1da177e4 LT	159	break;
	160	}
	161	}
	162
	163	return p - skb->data;
	164	}
	165
	166	/*
	167	* Create a set of facilities.
	168	*/
	169	int x25_create_facilities(unsigned char *buffer,
a64b7b93 SP	170	struct x25_facilities *facilities,
a64b7b93 SP	171	struct x25_dte_facilities *dte_facs, unsigned long facil_mask)
1da177e4 LT	172	{
	173	unsigned char *p = buffer + 1;
	174	int len;
	175
	176	if (!facil_mask) {
	177	/*
	178	* Length of the facilities field in call_req or
	179	* call_accept packets
	180	*/
	181	buffer[0] = 0;
	182	len = 1; /* 1 byte for the length field */
	183	return len;
	184	}
	185
	186	if (facilities->reverse && (facil_mask & X25_MASK_REVERSE)) {
	187	*p++ = X25_FAC_REVERSE;
ebc3f64b	188	*p++ = facilities->reverse;
1da177e4 LT	189	}
	190
	191	if (facilities->throughput && (facil_mask & X25_MASK_THROUGHPUT)) {
	192	*p++ = X25_FAC_THROUGHPUT;
	193	*p++ = facilities->throughput;
	194	}
	195
	196	if ((facilities->pacsize_in \|\| facilities->pacsize_out) &&
	197	(facil_mask & X25_MASK_PACKET_SIZE)) {
	198	*p++ = X25_FAC_PACKET_SIZE;
	199	*p++ = facilities->pacsize_in ? : facilities->pacsize_out;
	200	*p++ = facilities->pacsize_out ? : facilities->pacsize_in;
	201	}
	202
	203	if ((facilities->winsize_in \|\| facilities->winsize_out) &&
	204	(facil_mask & X25_MASK_WINDOW_SIZE)) {
	205	*p++ = X25_FAC_WINDOW_SIZE;
	206	*p++ = facilities->winsize_in ? : facilities->winsize_out;
	207	*p++ = facilities->winsize_out ? : facilities->winsize_in;
	208	}
	209
a64b7b93 SP	210	if (facil_mask & (X25_MASK_CALLING_AE\|X25_MASK_CALLED_AE)) {
	211	*p++ = X25_MARKER;
	212	*p++ = X25_DTE_SERVICES;
	213	}
	214
	215	if (dte_facs->calling_len && (facil_mask & X25_MASK_CALLING_AE)) {
6bf1574e	216	unsigned bytecount = (dte_facs->calling_len + 1) >> 1;
a64b7b93 SP	217	*p++ = X25_FAC_CALLING_AE;
	218	*p++ = 1 + bytecount;
	219	*p++ = dte_facs->calling_len;
	220	memcpy(p, dte_facs->calling_ae, bytecount);
	221	p += bytecount;
	222	}
	223
	224	if (dte_facs->called_len && (facil_mask & X25_MASK_CALLED_AE)) {
	225	unsigned bytecount = (dte_facs->called_len % 2) ?
	226	dte_facs->called_len / 2 + 1 :
	227	dte_facs->called_len / 2;
	228	*p++ = X25_FAC_CALLED_AE;
	229	*p++ = 1 + bytecount;
	230	*p++ = dte_facs->called_len;
	231	memcpy(p, dte_facs->called_ae, bytecount);
	232	p+=bytecount;
	233	}
	234
1da177e4 LT	235	len = p - buffer;
	236	buffer[0] = len - 1;
	237
	238	return len;
	239	}
	240
	241	/*
	242	* Try to reach a compromise on a set of facilities.
	243	*
	244	* The only real problem is with reverse charging.
	245	*/
	246	int x25_negotiate_facilities(struct sk_buff skb, struct sock sk,
a64b7b93	247	struct x25_facilities new, struct x25_dte_facilities dte)
1da177e4 LT	248	{
	249	struct x25_sock *x25 = x25_sk(sk);
	250	struct x25_facilities *ours = &x25->facilities;
	251	struct x25_facilities theirs;
	252	int len;
	253
	254	memset(&theirs, 0, sizeof(theirs));
	255	memcpy(new, ours, sizeof(*new));
	256
a64b7b93	257	len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);
f5eb917b JH	258	if (len < 0)
f5eb917b JH	259	return len;
1da177e4 LT	260
	261	/*
	262	* They want reverse charging, we won't accept it.
	263	*/
ebc3f64b	264	if ((theirs.reverse & 0x01 ) && (ours->reverse & 0x01)) {
d2e7543c	265	SOCK_DEBUG(sk, "X.25: rejecting reverse charging request\n");
1da177e4 LT	266	return -1;
	267	}
	268
	269	new->reverse = theirs.reverse;
	270
	271	if (theirs.throughput) {
ddd0451f JH	272	int theirs_in = theirs.throughput & 0x0f;
	273	int theirs_out = theirs.throughput & 0xf0;
	274	int ours_in = ours->throughput & 0x0f;
	275	int ours_out = ours->throughput & 0xf0;
	276	if (!ours_in \|\| theirs_in < ours_in) {
	277	SOCK_DEBUG(sk, "X.25: inbound throughput negotiated\n");
	278	new->throughput = (new->throughput & 0xf0) \| theirs_in;
	279	}
	280	if (!ours_out \|\| theirs_out < ours_out) {
	281	SOCK_DEBUG(sk,
	282	"X.25: outbound throughput negotiated\n");
	283	new->throughput = (new->throughput & 0x0f) \| theirs_out;
1da177e4 LT	284	}
	285	}
	286
	287	if (theirs.pacsize_in && theirs.pacsize_out) {
	288	if (theirs.pacsize_in < ours->pacsize_in) {
d2e7543c	289	SOCK_DEBUG(sk, "X.25: packet size inwards negotiated down\n");
1da177e4 LT	290	new->pacsize_in = theirs.pacsize_in;
	291	}
	292	if (theirs.pacsize_out < ours->pacsize_out) {
d2e7543c	293	SOCK_DEBUG(sk, "X.25: packet size outwards negotiated down\n");
1da177e4 LT	294	new->pacsize_out = theirs.pacsize_out;
	295	}
	296	}
	297
	298	if (theirs.winsize_in && theirs.winsize_out) {
	299	if (theirs.winsize_in < ours->winsize_in) {
d2e7543c	300	SOCK_DEBUG(sk, "X.25: window size inwards negotiated down\n");
1da177e4 LT	301	new->winsize_in = theirs.winsize_in;
	302	}
	303	if (theirs.winsize_out < ours->winsize_out) {
d2e7543c	304	SOCK_DEBUG(sk, "X.25: window size outwards negotiated down\n");
1da177e4 LT	305	new->winsize_out = theirs.winsize_out;
	306	}
	307	}
	308
	309	return len;
	310	}
	311
	312	/*
f8e1d201	313	* Limit values of certain facilities according to the capability of the
1da177e4 LT	314	* currently attached x25 link.
	315	*/
	316	void x25_limit_facilities(struct x25_facilities *facilities,
	317	struct x25_neigh *nb)
	318	{
	319
	320	if (!nb->extended) {
	321	if (facilities->winsize_in > 7) {
	322	printk(KERN_DEBUG "X.25: incoming winsize limited to 7\n");
	323	facilities->winsize_in = 7;
	324	}
	325	if (facilities->winsize_out > 7) {
	326	facilities->winsize_out = 7;
	327	printk( KERN_DEBUG "X.25: outgoing winsize limited to 7\n");
	328	}
	329	}
	330	}