[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wan / hdlc_x25.c

/*
 * Generic HDLC support routines for Linux
 * X.25 support
 *
 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 */

#include <linux/errno.h>
#include <linux/hdlc.h>
#include <linux/if_arp.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/lapb.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <linux/poll.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/x25device.h>

static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);

/* These functions are callbacks called by LAPB layer */

static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
{
	struct sk_buff *skb;
	unsigned char *ptr;

	if ((skb = dev_alloc_skb(1)) == NULL) {
		printk(KERN_ERR "%s: out of memory\n", dev->name);
		return;
	}

	ptr = skb_put(skb, 1);
	*ptr = code;

	skb->protocol = x25_type_trans(skb, dev);
	netif_rx(skb);
}


static void x25_connected(struct net_device *dev, int reason)
{
	x25_connect_disconnect(dev, reason, 1);
}


static void x25_disconnected(struct net_device *dev, int reason)
{
	x25_connect_disconnect(dev, reason, 2);
}


static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
{
	unsigned char *ptr;

	skb_push(skb, 1);

	if (skb_cow(skb, 1))
		return NET_RX_DROP;

	ptr  = skb->data;
	*ptr = 0;

	skb->protocol = x25_type_trans(skb, dev);
	return netif_rx(skb);
}


static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	hdlc->xmit(skb, dev); /* Ignore return value :-( */
}


static int x25_xmit(struct sk_buff *skb, struct net_device *dev)
{
	int result;


	/* X.25 to LAPB */
	switch (skb->data[0]) {
	case 0:		/* Data to be transmitted */
		skb_pull(skb, 1);
		if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
			dev_kfree_skb(skb);
		return 0;

	case 1:
		if ((result = lapb_connect_request(dev))!= LAPB_OK) {
			if (result == LAPB_CONNECTED)
				/* Send connect confirm. msg to level 3 */
				x25_connected(dev, 0);
			else
				printk(KERN_ERR "%s: LAPB connect request "
				       "failed, error code = %i\n",
				       dev->name, result);
		}
		break;

	case 2:
		if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
			if (result == LAPB_NOTCONNECTED)
				/* Send disconnect confirm. msg to level 3 */
				x25_disconnected(dev, 0);
			else
				printk(KERN_ERR "%s: LAPB disconnect request "
				       "failed, error code = %i\n",
				       dev->name, result);
		}
		break;

	default:		/* to be defined */
		break;
	}

	dev_kfree_skb(skb);
	return 0;
}


static int x25_open(struct net_device *dev)
{
	struct lapb_register_struct cb;
	int result;

	cb.connect_confirmation = x25_connected;
	cb.connect_indication = x25_connected;
	cb.disconnect_confirmation = x25_disconnected;
	cb.disconnect_indication = x25_disconnected;
	cb.data_indication = x25_data_indication;
	cb.data_transmit = x25_data_transmit;

	result = lapb_register(dev, &cb);
	if (result != LAPB_OK)
		return result;
	return 0;
}


static void x25_close(struct net_device *dev)
{
	lapb_unregister(dev);
}


static int x25_rx(struct sk_buff *skb)
{
	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
		skb->dev->stats.rx_dropped++;
		return NET_RX_DROP;
	}

	if (lapb_data_received(skb->dev, skb) == LAPB_OK)
		return NET_RX_SUCCESS;

	skb->dev->stats.rx_errors++;
	dev_kfree_skb_any(skb);
	return NET_RX_DROP;
}


static struct hdlc_proto proto = {
	.open		= x25_open,
	.close		= x25_close,
	.ioctl		= x25_ioctl,
	.netif_rx	= x25_rx,
	.module		= THIS_MODULE,
};


static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	int result;

	switch (ifr->ifr_settings.type) {
	case IF_GET_PROTO:
		if (dev_to_hdlc(dev)->proto != &proto)
			return -EINVAL;
		ifr->ifr_settings.type = IF_PROTO_X25;
		return 0; /* return protocol only, no settable parameters */

	case IF_PROTO_X25:
		if(!capable(CAP_NET_ADMIN))
			return -EPERM;

		if(dev->flags & IFF_UP)
			return -EBUSY;

		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
		if (result)
			return result;

		if ((result = attach_hdlc_protocol(dev, &proto, 0)))
			return result;
		dev->hard_start_xmit = x25_xmit;
		dev->type = ARPHRD_X25;
		netif_dormant_off(dev);
		return 0;
	}

	return -EINVAL;
}


static int __init mod_init(void)
{
	register_hdlc_protocol(&proto);
	return 0;
}


static void __exit mod_exit(void)
{
	unregister_hdlc_protocol(&proto);
}


module_init(mod_init);
module_exit(mod_exit);

MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic HDLC support routines for Linux
	3	* X.25 support
	4	*
eb2a2fd9	5	* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
1da177e4 LT	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of version 2 of the GNU General Public License
	9	* as published by the Free Software Foundation.
	10	*/
	11
1da177e4	12	#include <linux/errno.h>
4dfce407	13	#include <linux/hdlc.h>
1da177e4	14	#include <linux/if_arp.h>
1da177e4	15	#include <linux/inetdevice.h>
4dfce407 KH	16	#include <linux/init.h>
4dfce407 KH	17	#include <linux/kernel.h>
1da177e4	18	#include <linux/lapb.h>
4dfce407 KH	19	#include <linux/module.h>
	20	#include <linux/pkt_sched.h>
	21	#include <linux/poll.h>
1da177e4	22	#include <linux/rtnetlink.h>
4dfce407 KH	23	#include <linux/skbuff.h>
4dfce407 KH	24	#include <linux/slab.h>
1da177e4 LT	25	#include <net/x25device.h>
1da177e4 LT	26
eb2a2fd9 KH	27	static int x25_ioctl(struct net_device dev, struct ifreq ifr);
eb2a2fd9 KH	28
1da177e4 LT	29	/* These functions are callbacks called by LAPB layer */
	30
	31	static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
	32	{
	33	struct sk_buff *skb;
	34	unsigned char *ptr;
	35
	36	if ((skb = dev_alloc_skb(1)) == NULL) {
	37	printk(KERN_ERR "%s: out of memory\n", dev->name);
	38	return;
	39	}
	40
	41	ptr = skb_put(skb, 1);
	42	*ptr = code;
	43
	44	skb->protocol = x25_type_trans(skb, dev);
	45	netif_rx(skb);
	46	}
	47
	48
	49
	50	static void x25_connected(struct net_device *dev, int reason)
	51	{
	52	x25_connect_disconnect(dev, reason, 1);
	53	}
	54
	55
	56
	57	static void x25_disconnected(struct net_device *dev, int reason)
	58	{
	59	x25_connect_disconnect(dev, reason, 2);
	60	}
	61
	62
	63
	64	static int x25_data_indication(struct net_device dev, struct sk_buff skb)
	65	{
	66	unsigned char *ptr;
	67
	68	skb_push(skb, 1);
	69
	70	if (skb_cow(skb, 1))
	71	return NET_RX_DROP;
	72
	73	ptr = skb->data;
	74	*ptr = 0;
	75
	76	skb->protocol = x25_type_trans(skb, dev);
	77	return netif_rx(skb);
	78	}
	79
	80
	81
	82	static void x25_data_transmit(struct net_device dev, struct sk_buff skb)
	83	{
	84	hdlc_device *hdlc = dev_to_hdlc(dev);
	85	hdlc->xmit(skb, dev); /* Ignore return value :-( */
	86	}
	87
	88
	89
	90	static int x25_xmit(struct sk_buff skb, struct net_device dev)
	91	{
	92	int result;
93
94
95	/* X.25 to LAPB */
96	switch (skb->data[0]) {
97	case 0: /* Data to be transmitted */
98	skb_pull(skb, 1);
99	if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
100	dev_kfree_skb(skb);
101	return 0;
102
103	case 1:
104	if ((result = lapb_connect_request(dev))!= LAPB_OK) {
105	if (result == LAPB_CONNECTED)
106	/* Send connect confirm. msg to level 3 */
107	x25_connected(dev, 0);
108	else
109	printk(KERN_ERR "%s: LAPB connect request "
110	"failed, error code = %i\n",
111	dev->name, result);
112	}
113	break;
114
115	case 2:
116	if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
117	if (result == LAPB_NOTCONNECTED)
118	/* Send disconnect confirm. msg to level 3 */
119	x25_disconnected(dev, 0);
120	else
121	printk(KERN_ERR "%s: LAPB disconnect request "
122	"failed, error code = %i\n",
123	dev->name, result);
124	}
125	break;
126
127	default: /* to be defined */
128	break;
129	}
130
131	dev_kfree_skb(skb);
132	return 0;
133	}
134
135
136
137	static int x25_open(struct net_device *dev)
138	{
139	struct lapb_register_struct cb;
140	int result;
141
142	cb.connect_confirmation = x25_connected;
143	cb.connect_indication = x25_connected;
144	cb.disconnect_confirmation = x25_disconnected;
145	cb.disconnect_indication = x25_disconnected;
146	cb.data_indication = x25_data_indication;
147	cb.data_transmit = x25_data_transmit;
148
149	result = lapb_register(dev, &cb);
150	if (result != LAPB_OK)
151	return result;
152	return 0;
153	}
154
155
156
157	static void x25_close(struct net_device *dev)
158	{
159	lapb_unregister(dev);
160	}
161
162
163
164	static int x25_rx(struct sk_buff *skb)
165	{
1da177e4	166	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
198191c4	167	skb->dev->stats.rx_dropped++;
1da177e4 LT	168	return NET_RX_DROP;
	169	}
	170
	171	if (lapb_data_received(skb->dev, skb) == LAPB_OK)
	172	return NET_RX_SUCCESS;
	173
198191c4	174	skb->dev->stats.rx_errors++;
1da177e4 LT	175	dev_kfree_skb_any(skb);
	176	return NET_RX_DROP;
	177	}
	178
	179
eb2a2fd9 KH	180	static struct hdlc_proto proto = {
	181	.open = x25_open,
	182	.close = x25_close,
	183	.ioctl = x25_ioctl,
40d25142	184	.netif_rx = x25_rx,
eb2a2fd9 KH	185	.module = THIS_MODULE,
	186	};
	187
1da177e4	188
eb2a2fd9	189	static int x25_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	190	{
	191	hdlc_device *hdlc = dev_to_hdlc(dev);
	192	int result;
	193
	194	switch (ifr->ifr_settings.type) {
	195	case IF_GET_PROTO:
eb2a2fd9 KH	196	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	197	return -EINVAL;
1da177e4 LT	198	ifr->ifr_settings.type = IF_PROTO_X25;
	199	return 0; /* return protocol only, no settable parameters */
	200
	201	case IF_PROTO_X25:
	202	if(!capable(CAP_NET_ADMIN))
	203	return -EPERM;
	204
	205	if(dev->flags & IFF_UP)
	206	return -EBUSY;
	207
	208	result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
	209	if (result)
	210	return result;
	211
40d25142	212	if ((result = attach_hdlc_protocol(dev, &proto, 0)))
eb2a2fd9	213	return result;
1da177e4	214	dev->hard_start_xmit = x25_xmit;
1da177e4	215	dev->type = ARPHRD_X25;
4bc83b4d	216	netif_dormant_off(dev);
1da177e4 LT	217	return 0;
	218	}
	219
	220	return -EINVAL;
	221	}
eb2a2fd9 KH	222
	223
	224	static int __init mod_init(void)
	225	{
	226	register_hdlc_protocol(&proto);
	227	return 0;
	228	}
	229
	230
	231
	232	static void __exit mod_exit(void)
	233	{
	234	unregister_hdlc_protocol(&proto);
	235	}
	236
	237
	238	module_init(mod_init);
	239	module_exit(mod_exit);
	240
	241	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	242	MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
	243	MODULE_LICENSE("GPL v2");