[deliverable/linux.git] / drivers / net / wan / hdlc_raw.c

/*
 * Generic HDLC support routines for Linux
 * HDLC 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/module.h>
#include <linux/pkt_sched.h>
#include <linux/poll.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>


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

static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
{
	return cpu_to_be16(ETH_P_IP);
}

static struct hdlc_proto proto = {
	.type_trans	= raw_type_trans,
	.ioctl		= raw_ioctl,
	.module		= THIS_MODULE,
};


static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
{
	raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
	const size_t size = sizeof(raw_hdlc_proto);
	raw_hdlc_proto new_settings;
	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_HDLC;
		if (ifr->ifr_settings.size < size) {
			ifr->ifr_settings.size = size; /* data size wanted */
			return -ENOBUFS;
		}
		if (copy_to_user(raw_s, hdlc->state, size))
			return -EFAULT;
		return 0;

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

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

		if (copy_from_user(&new_settings, raw_s, size))
			return -EFAULT;

		if (new_settings.encoding == ENCODING_DEFAULT)
			new_settings.encoding = ENCODING_NRZ;

		if (new_settings.parity == PARITY_DEFAULT)
			new_settings.parity = PARITY_CRC16_PR1_CCITT;

		result = hdlc->attach(dev, new_settings.encoding,
				      new_settings.parity);
		if (result)
			return result;

		result = attach_hdlc_protocol(dev, &proto,
					      sizeof(raw_hdlc_proto));
		if (result)
			return result;
		memcpy(hdlc->state, &new_settings, size);
		dev->type = ARPHRD_RAWHDLC;
		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("Raw HDLC protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic HDLC support routines for Linux
	3	* HDLC 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>
4dfce407	15	#include <linux/inetdevice.h>
1da177e4	16	#include <linux/init.h>
4dfce407 KH	17	#include <linux/kernel.h>
4dfce407 KH	18	#include <linux/module.h>
1da177e4	19	#include <linux/pkt_sched.h>
4dfce407	20	#include <linux/poll.h>
1da177e4	21	#include <linux/rtnetlink.h>
4dfce407	22	#include <linux/skbuff.h>
1da177e4 LT	23
1da177e4 LT	24
eb2a2fd9 KH	25	static int raw_ioctl(struct net_device dev, struct ifreq ifr);
eb2a2fd9 KH	26
ab611487	27	static __be16 raw_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	28	{
09640e63	29	return cpu_to_be16(ETH_P_IP);
1da177e4 LT	30	}
1da177e4 LT	31
eb2a2fd9 KH	32	static struct hdlc_proto proto = {
	33	.type_trans = raw_type_trans,
	34	.ioctl = raw_ioctl,
	35	.module = THIS_MODULE,
	36	};
	37
	38
	39	static int raw_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	40	{
	41	raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
	42	const size_t size = sizeof(raw_hdlc_proto);
	43	raw_hdlc_proto new_settings;
	44	hdlc_device *hdlc = dev_to_hdlc(dev);
	45	int result;
	46
	47	switch (ifr->ifr_settings.type) {
	48	case IF_GET_PROTO:
eb2a2fd9 KH	49	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	50	return -EINVAL;
1da177e4 LT	51	ifr->ifr_settings.type = IF_PROTO_HDLC;
	52	if (ifr->ifr_settings.size < size) {
	53	ifr->ifr_settings.size = size; /* data size wanted */
	54	return -ENOBUFS;
	55	}
eb2a2fd9	56	if (copy_to_user(raw_s, hdlc->state, size))
1da177e4 LT	57	return -EFAULT;
	58	return 0;
	59
	60	case IF_PROTO_HDLC:
	61	if (!capable(CAP_NET_ADMIN))
	62	return -EPERM;
	63
	64	if (dev->flags & IFF_UP)
	65	return -EBUSY;
	66
	67	if (copy_from_user(&new_settings, raw_s, size))
	68	return -EFAULT;
	69
	70	if (new_settings.encoding == ENCODING_DEFAULT)
	71	new_settings.encoding = ENCODING_NRZ;
	72
	73	if (new_settings.parity == PARITY_DEFAULT)
	74	new_settings.parity = PARITY_CRC16_PR1_CCITT;
	75
	76	result = hdlc->attach(dev, new_settings.encoding,
	77	new_settings.parity);
	78	if (result)
	79	return result;
	80
40d25142	81	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	82	sizeof(raw_hdlc_proto));
	83	if (result)
	84	return result;
	85	memcpy(hdlc->state, &new_settings, size);
1da177e4	86	dev->type = ARPHRD_RAWHDLC;
4bc83b4d	87	netif_dormant_off(dev);
1da177e4 LT	88	return 0;
	89	}
	90
	91	return -EINVAL;
	92	}
eb2a2fd9 KH	93
	94
	95	static int __init mod_init(void)
	96	{
	97	register_hdlc_protocol(&proto);
	98	return 0;
	99	}
	100
	101
	102
	103	static void __exit mod_exit(void)
	104	{
	105	unregister_hdlc_protocol(&proto);
	106	}
	107
	108
	109	module_init(mod_init);
	110	module_exit(mod_exit);
	111
	112	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	113	MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
	114	MODULE_LICENSE("GPL v2");