[linux-2.6-block.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.
 */

#define pr_fmt(fmt) "X25: " fmt

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

/**
 * x25_parse_facilities - Parse facilities from skb into the facilities structs
 *
 * @skb: sk_buff to parse
 * @facilities: Regular facilities, updated as facilities are found
 * @dte_facs: ITU DTE facilities, updated as DTE facilities are found
 * @vc_fac_mask: mask is updated with all facilities found
 *
 * Return codes:
 *  -1 - Parsing error, caller should drop call and clean up
 *   0 - Parse OK, this skb has no facilities
 *  >0 - Parse OK, returns the length of the facilities header
 *
 */
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;
	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 (!pskb_may_pull(skb, 1))
		return 0;

	len = skb->data[0];

	if (!pskb_may_pull(skb, 1 + len))
		return -1;

	p = skb->data + 1;

	while (len > 0) {
		switch (*p & X25_FAC_CLASS_MASK) {
		case X25_FAC_CLASS_A:
			if (len < 2)
				return -1;
			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:
				pr_debug("unknown facility "
				       "%02X, value %02X\n",
				       p[0], p[1]);
				break;
			}
			p   += 2;
			len -= 2;
			break;
		case X25_FAC_CLASS_B:
			if (len < 3)
				return -1;
			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:
				pr_debug("unknown facility "
				       "%02X, values %02X, %02X\n",
				       p[0], p[1], p[2]);
				break;
			}
			p   += 3;
			len -= 3;
			break;
		case X25_FAC_CLASS_C:
			if (len < 4)
				return -1;
			pr_debug("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:
			if (len < p[1] + 2)
				return -1;
			switch (*p) {
			case X25_FAC_CALLING_AE:
				if (p[1] > X25_MAX_DTE_FACIL_LEN || p[1] <= 1)
					return -1;
				if (p[2] > X25_MAX_AE_LEN)
					return -1;
				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 -1;
				if (p[2] > X25_MAX_AE_LEN)
					return -1;
				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:
				pr_debug("unknown facility %02X,"
					"length %d\n", p[0], p[1]);
				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 int 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 int 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));
	memset(dte, 0, sizeof(*dte));

	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) {
			pr_debug("incoming winsize limited to 7\n");
			facilities->winsize_in = 7;
		}
		if (facilities->winsize_out > 7) {
			facilities->winsize_out = 7;
			pr_debug("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	*/
1da177e4 LT	23
b73e9e3c	24	#define pr_fmt(fmt) "X25: " fmt
b73e9e3c	25
1da177e4 LT	26	#include <linux/kernel.h>
	27	#include <linux/string.h>
	28	#include <linux/skbuff.h>
	29	#include <net/sock.h>
	30	#include <net/x25.h>
	31
95c30430	32	/**
	33	* x25_parse_facilities - Parse facilities from skb into the facilities structs
	34	*
	35	* @skb: sk_buff to parse
25985edc	36	* @facilities: Regular facilities, updated as facilities are found
95c30430	37	* @dte_facs: ITU DTE facilities, updated as DTE facilities are found
	38	* @vc_fac_mask: mask is updated with all facilities found
	39	*
	40	* Return codes:
	41	* -1 - Parsing error, caller should drop call and clean up
	42	* 0 - Parse OK, this skb has no facilities
	43	* >0 - Parse OK, returns the length of the facilities header
	44	*
1da177e4	45	*/
a64b7b93 SP	46	int x25_parse_facilities(struct sk_buff skb, struct x25_facilities facilities,
a64b7b93 SP	47	struct x25_dte_facilities dte_facs, unsigned long vc_fac_mask)
1da177e4	48	{
cb101ed2	49	unsigned char *p;
f5eb917b	50	unsigned int len;
1da177e4 LT	51
	52	*vc_fac_mask = 0;
	53
a64b7b93 SP	54	/*
	55	* The kernel knows which facilities were set on an incoming call but
	56	* currently this information is not available to userspace. Here we
	57	* give userspace who read incoming call facilities 0 length to indicate
	58	* it wasn't set.
	59	*/
	60	dte_facs->calling_len = 0;
	61	dte_facs->called_len = 0;
	62	memset(dte_facs->called_ae, '\0', sizeof(dte_facs->called_ae));
	63	memset(dte_facs->calling_ae, '\0', sizeof(dte_facs->calling_ae));
	64
cb101ed2	65	if (!pskb_may_pull(skb, 1))
f5eb917b JH	66	return 0;
f5eb917b JH	67
cb101ed2	68	len = skb->data[0];
f5eb917b	69
cb101ed2	70	if (!pskb_may_pull(skb, 1 + len))
f5eb917b JH	71	return -1;
f5eb917b JH	72
cb101ed2 MD	73	p = skb->data + 1;
cb101ed2 MD	74
1da177e4 LT	75	while (len > 0) {
	76	switch (*p & X25_FAC_CLASS_MASK) {
	77	case X25_FAC_CLASS_A:
5ef41308	78	if (len < 2)
95c30430	79	return -1;
1da177e4 LT	80	switch (*p) {
1da177e4 LT	81	case X25_FAC_REVERSE:
ebc3f64b SP	82	if((p[1] & 0x81) == 0x81) {
	83	facilities->reverse = p[1] & 0x81;
	84	*vc_fac_mask \|= X25_MASK_REVERSE;
	85	break;
	86	}
	87
	88	if((p[1] & 0x01) == 0x01) {
	89	facilities->reverse = p[1] & 0x01;
	90	*vc_fac_mask \|= X25_MASK_REVERSE;
	91	break;
	92	}
	93
	94	if((p[1] & 0x80) == 0x80) {
	95	facilities->reverse = p[1] & 0x80;
	96	*vc_fac_mask \|= X25_MASK_REVERSE;
	97	break;
	98	}
	99
	100	if(p[1] == 0x00) {
	101	facilities->reverse
	102	= X25_DEFAULT_REVERSE;
	103	*vc_fac_mask \|= X25_MASK_REVERSE;
	104	break;
	105	}
	106
1da177e4 LT	107	case X25_FAC_THROUGHPUT:
	108	facilities->throughput = p[1];
	109	*vc_fac_mask \|= X25_MASK_THROUGHPUT;
	110	break;
a64b7b93 SP	111	case X25_MARKER:
a64b7b93 SP	112	break;
1da177e4	113	default:
b73e9e3c	114	pr_debug("unknown facility "
1da177e4 LT	115	"%02X, value %02X\n",
	116	p[0], p[1]);
	117	break;
	118	}
	119	p += 2;
	120	len -= 2;
	121	break;
	122	case X25_FAC_CLASS_B:
5ef41308	123	if (len < 3)
95c30430	124	return -1;
1da177e4 LT	125	switch (*p) {
	126	case X25_FAC_PACKET_SIZE:
	127	facilities->pacsize_in = p[1];
	128	facilities->pacsize_out = p[2];
	129	*vc_fac_mask \|= X25_MASK_PACKET_SIZE;
	130	break;
	131	case X25_FAC_WINDOW_SIZE:
	132	facilities->winsize_in = p[1];
	133	facilities->winsize_out = p[2];
	134	*vc_fac_mask \|= X25_MASK_WINDOW_SIZE;
	135	break;
	136	default:
b73e9e3c	137	pr_debug("unknown facility "
1da177e4 LT	138	"%02X, values %02X, %02X\n",
	139	p[0], p[1], p[2]);
	140	break;
	141	}
	142	p += 3;
	143	len -= 3;
	144	break;
	145	case X25_FAC_CLASS_C:
5ef41308	146	if (len < 4)
95c30430	147	return -1;
b73e9e3c	148	pr_debug("unknown facility %02X, "
1da177e4 LT	149	"values %02X, %02X, %02X\n",
	150	p[0], p[1], p[2], p[3]);
	151	p += 4;
	152	len -= 4;
	153	break;
	154	case X25_FAC_CLASS_D:
5ef41308	155	if (len < p[1] + 2)
95c30430	156	return -1;
a64b7b93	157	switch (*p) {
f8e1d201	158	case X25_FAC_CALLING_AE:
a6331d6f	159	if (p[1] > X25_MAX_DTE_FACIL_LEN \|\| p[1] <= 1)
95c30430	160	return -1;
80aa4e10 DC	161	if (p[2] > X25_MAX_AE_LEN)
80aa4e10 DC	162	return -1;
a64b7b93 SP	163	dte_facs->calling_len = p[2];
	164	memcpy(dte_facs->calling_ae, &p[3], p[1] - 1);
	165	*vc_fac_mask \|= X25_MASK_CALLING_AE;
	166	break;
	167	case X25_FAC_CALLED_AE:
a6331d6f	168	if (p[1] > X25_MAX_DTE_FACIL_LEN \|\| p[1] <= 1)
95c30430	169	return -1;
80aa4e10 DC	170	if (p[2] > X25_MAX_AE_LEN)
80aa4e10 DC	171	return -1;
a64b7b93 SP	172	dte_facs->called_len = p[2];
	173	memcpy(dte_facs->called_ae, &p[3], p[1] - 1);
	174	*vc_fac_mask \|= X25_MASK_CALLED_AE;
	175	break;
	176	default:
b73e9e3c	177	pr_debug("unknown facility %02X,"
5ef41308	178	"length %d\n", p[0], p[1]);
a64b7b93 SP	179	break;
a64b7b93 SP	180	}
1da177e4	181	len -= p[1] + 2;
a64b7b93	182	p += p[1] + 2;
1da177e4 LT	183	break;
	184	}
	185	}
	186
	187	return p - skb->data;
	188	}
	189
	190	/*
	191	* Create a set of facilities.
	192	*/
	193	int x25_create_facilities(unsigned char *buffer,
a64b7b93 SP	194	struct x25_facilities *facilities,
a64b7b93 SP	195	struct x25_dte_facilities *dte_facs, unsigned long facil_mask)
1da177e4 LT	196	{
	197	unsigned char *p = buffer + 1;
	198	int len;
	199
	200	if (!facil_mask) {
	201	/*
	202	* Length of the facilities field in call_req or
	203	* call_accept packets
	204	*/
	205	buffer[0] = 0;
	206	len = 1; /* 1 byte for the length field */
	207	return len;
	208	}
	209
	210	if (facilities->reverse && (facil_mask & X25_MASK_REVERSE)) {
	211	*p++ = X25_FAC_REVERSE;
ebc3f64b	212	*p++ = facilities->reverse;
1da177e4 LT	213	}
	214
	215	if (facilities->throughput && (facil_mask & X25_MASK_THROUGHPUT)) {
	216	*p++ = X25_FAC_THROUGHPUT;
	217	*p++ = facilities->throughput;
	218	}
	219
	220	if ((facilities->pacsize_in \|\| facilities->pacsize_out) &&
	221	(facil_mask & X25_MASK_PACKET_SIZE)) {
	222	*p++ = X25_FAC_PACKET_SIZE;
	223	*p++ = facilities->pacsize_in ? : facilities->pacsize_out;
	224	*p++ = facilities->pacsize_out ? : facilities->pacsize_in;
	225	}
	226
	227	if ((facilities->winsize_in \|\| facilities->winsize_out) &&
	228	(facil_mask & X25_MASK_WINDOW_SIZE)) {
	229	*p++ = X25_FAC_WINDOW_SIZE;
	230	*p++ = facilities->winsize_in ? : facilities->winsize_out;
	231	*p++ = facilities->winsize_out ? : facilities->winsize_in;
	232	}
	233
a64b7b93 SP	234	if (facil_mask & (X25_MASK_CALLING_AE\|X25_MASK_CALLED_AE)) {
	235	*p++ = X25_MARKER;
	236	*p++ = X25_DTE_SERVICES;
	237	}
	238
	239	if (dte_facs->calling_len && (facil_mask & X25_MASK_CALLING_AE)) {
95c96174	240	unsigned int bytecount = (dte_facs->calling_len + 1) >> 1;
a64b7b93 SP	241	*p++ = X25_FAC_CALLING_AE;
	242	*p++ = 1 + bytecount;
	243	*p++ = dte_facs->calling_len;
	244	memcpy(p, dte_facs->calling_ae, bytecount);
	245	p += bytecount;
	246	}
	247
	248	if (dte_facs->called_len && (facil_mask & X25_MASK_CALLED_AE)) {
95c96174	249	unsigned int bytecount = (dte_facs->called_len % 2) ?
a64b7b93 SP	250	dte_facs->called_len / 2 + 1 :
	251	dte_facs->called_len / 2;
	252	*p++ = X25_FAC_CALLED_AE;
	253	*p++ = 1 + bytecount;
	254	*p++ = dte_facs->called_len;
	255	memcpy(p, dte_facs->called_ae, bytecount);
	256	p+=bytecount;
	257	}
	258
1da177e4 LT	259	len = p - buffer;
	260	buffer[0] = len - 1;
	261
	262	return len;
	263	}
	264
	265	/*
	266	* Try to reach a compromise on a set of facilities.
	267	*
	268	* The only real problem is with reverse charging.
	269	*/
	270	int x25_negotiate_facilities(struct sk_buff skb, struct sock sk,
a64b7b93	271	struct x25_facilities new, struct x25_dte_facilities dte)
1da177e4 LT	272	{
	273	struct x25_sock *x25 = x25_sk(sk);
	274	struct x25_facilities *ours = &x25->facilities;
	275	struct x25_facilities theirs;
	276	int len;
	277
	278	memset(&theirs, 0, sizeof(theirs));
	279	memcpy(new, ours, sizeof(*new));
79e48650	280	memset(dte, 0, sizeof(*dte));
1da177e4	281
a64b7b93	282	len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);
f5eb917b JH	283	if (len < 0)
f5eb917b JH	284	return len;
1da177e4 LT	285
	286	/*
	287	* They want reverse charging, we won't accept it.
	288	*/
ebc3f64b	289	if ((theirs.reverse & 0x01 ) && (ours->reverse & 0x01)) {
d2e7543c	290	SOCK_DEBUG(sk, "X.25: rejecting reverse charging request\n");
1da177e4 LT	291	return -1;
	292	}
	293
	294	new->reverse = theirs.reverse;
	295
	296	if (theirs.throughput) {
ddd0451f JH	297	int theirs_in = theirs.throughput & 0x0f;
	298	int theirs_out = theirs.throughput & 0xf0;
	299	int ours_in = ours->throughput & 0x0f;
	300	int ours_out = ours->throughput & 0xf0;
	301	if (!ours_in \|\| theirs_in < ours_in) {
	302	SOCK_DEBUG(sk, "X.25: inbound throughput negotiated\n");
	303	new->throughput = (new->throughput & 0xf0) \| theirs_in;
	304	}
	305	if (!ours_out \|\| theirs_out < ours_out) {
	306	SOCK_DEBUG(sk,
	307	"X.25: outbound throughput negotiated\n");
	308	new->throughput = (new->throughput & 0x0f) \| theirs_out;
1da177e4 LT	309	}
	310	}
	311
	312	if (theirs.pacsize_in && theirs.pacsize_out) {
	313	if (theirs.pacsize_in < ours->pacsize_in) {
d2e7543c	314	SOCK_DEBUG(sk, "X.25: packet size inwards negotiated down\n");
1da177e4 LT	315	new->pacsize_in = theirs.pacsize_in;
	316	}
	317	if (theirs.pacsize_out < ours->pacsize_out) {
d2e7543c	318	SOCK_DEBUG(sk, "X.25: packet size outwards negotiated down\n");
1da177e4 LT	319	new->pacsize_out = theirs.pacsize_out;
	320	}
	321	}
	322
	323	if (theirs.winsize_in && theirs.winsize_out) {
	324	if (theirs.winsize_in < ours->winsize_in) {
d2e7543c	325	SOCK_DEBUG(sk, "X.25: window size inwards negotiated down\n");
1da177e4 LT	326	new->winsize_in = theirs.winsize_in;
	327	}
	328	if (theirs.winsize_out < ours->winsize_out) {
d2e7543c	329	SOCK_DEBUG(sk, "X.25: window size outwards negotiated down\n");
1da177e4 LT	330	new->winsize_out = theirs.winsize_out;
	331	}
	332	}
	333
	334	return len;
	335	}
	336
	337	/*
f8e1d201	338	* Limit values of certain facilities according to the capability of the
1da177e4 LT	339	* currently attached x25 link.
	340	*/
	341	void x25_limit_facilities(struct x25_facilities *facilities,
	342	struct x25_neigh *nb)
	343	{
	344
	345	if (!nb->extended) {
	346	if (facilities->winsize_in > 7) {
b73e9e3c	347	pr_debug("incoming winsize limited to 7\n");
1da177e4 LT	348	facilities->winsize_in = 7;
	349	}
	350	if (facilities->winsize_out > 7) {
	351	facilities->winsize_out = 7;
b73e9e3c	352	pr_debug("outgoing winsize limited to 7\n");
1da177e4 LT	353	}
	354	}
	355	}