[linux-block.git] / drivers / net / wan / hdlc_raw.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic HDLC support routines for Linux
 * HDLC support
 *
 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
 */

#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 if_settings *ifs);

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 if_settings *ifs)
{
	raw_hdlc_proto __user *raw_s = ifs->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 (ifs->type) {
	case IF_GET_PROTO:
		if (dev_to_hdlc(dev)->proto != &proto)
			return -EINVAL;
		ifs->type = IF_PROTO_HDLC;
		if (ifs->size < size) {
			ifs->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;
		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
		netif_dormant_off(dev);
		return 0;
	}

	return -EINVAL;
}


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


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


module_init(hdlc_raw_init);
module_exit(hdlc_raw_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
25763b3c	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* Generic HDLC support routines for Linux
	4	* HDLC support
	5	*
eb2a2fd9	6	* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
1da177e4 LT	7	*/
1da177e4 LT	8
1da177e4	9	#include <linux/errno.h>
4dfce407	10	#include <linux/hdlc.h>
1da177e4	11	#include <linux/if_arp.h>
4dfce407	12	#include <linux/inetdevice.h>
1da177e4	13	#include <linux/init.h>
4dfce407 KH	14	#include <linux/kernel.h>
4dfce407 KH	15	#include <linux/module.h>
1da177e4	16	#include <linux/pkt_sched.h>
4dfce407	17	#include <linux/poll.h>
1da177e4	18	#include <linux/rtnetlink.h>
4dfce407	19	#include <linux/skbuff.h>
1da177e4 LT	20
1da177e4 LT	21
ad7eab2a	22	static int raw_ioctl(struct net_device dev, struct if_settings ifs);
eb2a2fd9	23
ab611487	24	static __be16 raw_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	25	{
09640e63	26	return cpu_to_be16(ETH_P_IP);
1da177e4 LT	27	}
1da177e4 LT	28
eb2a2fd9 KH	29	static struct hdlc_proto proto = {
	30	.type_trans = raw_type_trans,
	31	.ioctl = raw_ioctl,
	32	.module = THIS_MODULE,
	33	};
	34
	35
ad7eab2a	36	static int raw_ioctl(struct net_device dev, struct if_settings ifs)
1da177e4	37	{
ad7eab2a	38	raw_hdlc_proto __user *raw_s = ifs->ifs_ifsu.raw_hdlc;
1da177e4 LT	39	const size_t size = sizeof(raw_hdlc_proto);
	40	raw_hdlc_proto new_settings;
	41	hdlc_device *hdlc = dev_to_hdlc(dev);
	42	int result;
	43
ad7eab2a	44	switch (ifs->type) {
1da177e4	45	case IF_GET_PROTO:
eb2a2fd9 KH	46	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	47	return -EINVAL;
ad7eab2a AB	48	ifs->type = IF_PROTO_HDLC;
	49	if (ifs->size < size) {
	50	ifs->size = size; /* data size wanted */
1da177e4 LT	51	return -ENOBUFS;
1da177e4 LT	52	}
eb2a2fd9	53	if (copy_to_user(raw_s, hdlc->state, size))
1da177e4 LT	54	return -EFAULT;
	55	return 0;
	56
	57	case IF_PROTO_HDLC:
	58	if (!capable(CAP_NET_ADMIN))
	59	return -EPERM;
	60
	61	if (dev->flags & IFF_UP)
	62	return -EBUSY;
	63
	64	if (copy_from_user(&new_settings, raw_s, size))
	65	return -EFAULT;
	66
	67	if (new_settings.encoding == ENCODING_DEFAULT)
	68	new_settings.encoding = ENCODING_NRZ;
	69
	70	if (new_settings.parity == PARITY_DEFAULT)
	71	new_settings.parity = PARITY_CRC16_PR1_CCITT;
	72
	73	result = hdlc->attach(dev, new_settings.encoding,
	74	new_settings.parity);
	75	if (result)
	76	return result;
	77
40d25142	78	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	79	sizeof(raw_hdlc_proto));
	80	if (result)
	81	return result;
	82	memcpy(hdlc->state, &new_settings, size);
1da177e4	83	dev->type = ARPHRD_RAWHDLC;
2f8364a2	84	call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
4bc83b4d	85	netif_dormant_off(dev);
1da177e4 LT	86	return 0;
	87	}
	88
	89	return -EINVAL;
	90	}
eb2a2fd9 KH	91
eb2a2fd9 KH	92
a1739c30	93	static int __init hdlc_raw_init(void)
eb2a2fd9 KH	94	{
	95	register_hdlc_protocol(&proto);
	96	return 0;
	97	}
	98
	99
	100
a1739c30	101	static void __exit hdlc_raw_exit(void)
eb2a2fd9 KH	102	{
	103	unregister_hdlc_protocol(&proto);
	104	}
	105
	106
a1739c30 RD	107	module_init(hdlc_raw_init);
a1739c30 RD	108	module_exit(hdlc_raw_exit);
eb2a2fd9 KH	109
	110	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	111	MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
	112	MODULE_LICENSE("GPL v2");