[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/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/pkt_sched.h>
#include <linux/inetdevice.h>
#include <linux/lapb.h>
#include <linux/rtnetlink.h>
#include <linux/hdlc.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 __constant_htons(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, NULL,
					      sizeof(raw_hdlc_proto));
		if (result)
			return result;
		memcpy(hdlc->state, &new_settings, size);
		dev->hard_start_xmit = hdlc->xmit;
		dev->hard_header = NULL;
		dev->type = ARPHRD_RAWHDLC;
		dev->flags = IFF_POINTOPOINT | IFF_NOARP;
		dev->addr_len = 0;
		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
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/slab.h>
	15	#include <linux/poll.h>
	16	#include <linux/errno.h>
	17	#include <linux/if_arp.h>
	18	#include <linux/init.h>
	19	#include <linux/skbuff.h>
	20	#include <linux/pkt_sched.h>
	21	#include <linux/inetdevice.h>
	22	#include <linux/lapb.h>
	23	#include <linux/rtnetlink.h>
	24	#include <linux/hdlc.h>
	25
	26
eb2a2fd9 KH	27	static int raw_ioctl(struct net_device dev, struct ifreq ifr);
eb2a2fd9 KH	28
ab611487	29	static __be16 raw_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	30	{
	31	return __constant_htons(ETH_P_IP);
	32	}
	33
	34
	35
eb2a2fd9 KH	36	static struct hdlc_proto proto = {
	37	.type_trans = raw_type_trans,
	38	.ioctl = raw_ioctl,
	39	.module = THIS_MODULE,
	40	};
	41
	42
	43	static int raw_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	44	{
	45	raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
	46	const size_t size = sizeof(raw_hdlc_proto);
	47	raw_hdlc_proto new_settings;
	48	hdlc_device *hdlc = dev_to_hdlc(dev);
	49	int result;
	50
	51	switch (ifr->ifr_settings.type) {
	52	case IF_GET_PROTO:
eb2a2fd9 KH	53	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	54	return -EINVAL;
1da177e4 LT	55	ifr->ifr_settings.type = IF_PROTO_HDLC;
	56	if (ifr->ifr_settings.size < size) {
	57	ifr->ifr_settings.size = size; /* data size wanted */
	58	return -ENOBUFS;
	59	}
eb2a2fd9	60	if (copy_to_user(raw_s, hdlc->state, size))
1da177e4 LT	61	return -EFAULT;
	62	return 0;
	63
	64	case IF_PROTO_HDLC:
	65	if (!capable(CAP_NET_ADMIN))
	66	return -EPERM;
	67
	68	if (dev->flags & IFF_UP)
	69	return -EBUSY;
	70
	71	if (copy_from_user(&new_settings, raw_s, size))
	72	return -EFAULT;
	73
	74	if (new_settings.encoding == ENCODING_DEFAULT)
	75	new_settings.encoding = ENCODING_NRZ;
	76
	77	if (new_settings.parity == PARITY_DEFAULT)
	78	new_settings.parity = PARITY_CRC16_PR1_CCITT;
	79
	80	result = hdlc->attach(dev, new_settings.encoding,
	81	new_settings.parity);
	82	if (result)
	83	return result;
	84
eb2a2fd9 KH	85	result = attach_hdlc_protocol(dev, &proto, NULL,
	86	sizeof(raw_hdlc_proto));
	87	if (result)
	88	return result;
	89	memcpy(hdlc->state, &new_settings, size);
1da177e4 LT	90	dev->hard_start_xmit = hdlc->xmit;
	91	dev->hard_header = NULL;
	92	dev->type = ARPHRD_RAWHDLC;
	93	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
	94	dev->addr_len = 0;
4bc83b4d	95	netif_dormant_off(dev);
1da177e4 LT	96	return 0;
	97	}
	98
	99	return -EINVAL;
	100	}
eb2a2fd9 KH	101
	102
	103	static int __init mod_init(void)
	104	{
	105	register_hdlc_protocol(&proto);
	106	return 0;
	107	}
	108
	109
	110
	111	static void __exit mod_exit(void)
	112	{
	113	unregister_hdlc_protocol(&proto);
	114	}
	115
	116
	117	module_init(mod_init);
	118	module_exit(mod_exit);
	119
	120	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	121	MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
	122	MODULE_LICENSE("GPL v2");