[mirror_ubuntu-artful-kernel.git] / drivers / net / wan / hdlc_raw_eth.c

/*
 * Generic HDLC support routines for Linux
 * HDLC Ethernet emulation support
 *
 * Copyright (C) 2002-2006 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/etherdevice.h>
#include <linux/gfp.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_eth_ioctl(struct net_device *dev, struct ifreq *ifr);

static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev)
{
	int pad = ETH_ZLEN - skb->len;
	if (pad > 0) {		/* Pad the frame with zeros */
		int len = skb->len;
		if (skb_tailroom(skb) < pad)
			if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
				dev->stats.tx_dropped++;
				dev_kfree_skb(skb);
				return 0;
			}
		skb_put(skb, pad);
		memset(skb->data + len, 0, pad);
	}
	return dev_to_hdlc(dev)->xmit(skb, dev);
}


static struct hdlc_proto proto = {
	.type_trans	= eth_type_trans,
	.xmit		= eth_tx,
	.ioctl		= raw_eth_ioctl,
	.module		= THIS_MODULE,
};


static int raw_eth_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);
	unsigned int old_qlen;
	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_ETH;
		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_ETH:
		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);
		old_qlen = dev->tx_queue_len;
		ether_setup(dev);
		dev->tx_queue_len = old_qlen;
		eth_hw_addr_random(dev);
		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
		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("Ethernet encapsulation support for generic HDLC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic HDLC support routines for Linux
	3	* HDLC Ethernet emulation support
	4	*
eb2a2fd9	5	* Copyright (C) 2002-2006 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/etherdevice.h>
5a0e3ad6	14	#include <linux/gfp.h>
4dfce407	15	#include <linux/hdlc.h>
1da177e4	16	#include <linux/if_arp.h>
4dfce407	17	#include <linux/inetdevice.h>
1da177e4	18	#include <linux/init.h>
4dfce407 KH	19	#include <linux/kernel.h>
4dfce407 KH	20	#include <linux/module.h>
1da177e4	21	#include <linux/pkt_sched.h>
4dfce407	22	#include <linux/poll.h>
1da177e4	23	#include <linux/rtnetlink.h>
4dfce407	24	#include <linux/skbuff.h>
1da177e4	25
eb2a2fd9	26	static int raw_eth_ioctl(struct net_device dev, struct ifreq ifr);
1da177e4	27
d71a6749	28	static netdev_tx_t eth_tx(struct sk_buff skb, struct net_device dev)
1da177e4 LT	29	{
	30	int pad = ETH_ZLEN - skb->len;
	31	if (pad > 0) { /* Pad the frame with zeros */
	32	int len = skb->len;
	33	if (skb_tailroom(skb) < pad)
	34	if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
198191c4	35	dev->stats.tx_dropped++;
1da177e4 LT	36	dev_kfree_skb(skb);
	37	return 0;
	38	}
	39	skb_put(skb, pad);
	40	memset(skb->data + len, 0, pad);
	41	}
	42	return dev_to_hdlc(dev)->xmit(skb, dev);
	43	}
	44
	45
eb2a2fd9 KH	46	static struct hdlc_proto proto = {
eb2a2fd9 KH	47	.type_trans = eth_type_trans,
991990a1	48	.xmit = eth_tx,
eb2a2fd9 KH	49	.ioctl = raw_eth_ioctl,
	50	.module = THIS_MODULE,
	51	};
	52
	53
	54	static int raw_eth_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	55	{
	56	raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
	57	const size_t size = sizeof(raw_hdlc_proto);
	58	raw_hdlc_proto new_settings;
	59	hdlc_device *hdlc = dev_to_hdlc(dev);
0cd29503 AD	60	unsigned int old_qlen;
0cd29503 AD	61	int result;
1da177e4 LT	62
	63	switch (ifr->ifr_settings.type) {
	64	case IF_GET_PROTO:
eb2a2fd9 KH	65	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	66	return -EINVAL;
1da177e4 LT	67	ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
	68	if (ifr->ifr_settings.size < size) {
	69	ifr->ifr_settings.size = size; /* data size wanted */
	70	return -ENOBUFS;
	71	}
eb2a2fd9	72	if (copy_to_user(raw_s, hdlc->state, size))
1da177e4 LT	73	return -EFAULT;
	74	return 0;
	75
	76	case IF_PROTO_HDLC_ETH:
	77	if (!capable(CAP_NET_ADMIN))
	78	return -EPERM;
	79
	80	if (dev->flags & IFF_UP)
	81	return -EBUSY;
	82
	83	if (copy_from_user(&new_settings, raw_s, size))
	84	return -EFAULT;
	85
	86	if (new_settings.encoding == ENCODING_DEFAULT)
	87	new_settings.encoding = ENCODING_NRZ;
	88
	89	if (new_settings.parity == PARITY_DEFAULT)
	90	new_settings.parity = PARITY_CRC16_PR1_CCITT;
	91
	92	result = hdlc->attach(dev, new_settings.encoding,
	93	new_settings.parity);
	94	if (result)
	95	return result;
	96
40d25142	97	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	98	sizeof(raw_hdlc_proto));
	99	if (result)
	100	return result;
	101	memcpy(hdlc->state, &new_settings, size);
1da177e4 LT	102	old_qlen = dev->tx_queue_len;
1da177e4 LT	103	ether_setup(dev);
1da177e4	104	dev->tx_queue_len = old_qlen;
f2cedb63	105	eth_hw_addr_random(dev);
2f8364a2	106	call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
4bc83b4d	107	netif_dormant_off(dev);
1da177e4 LT	108	return 0;
	109	}
	110
	111	return -EINVAL;
	112	}
eb2a2fd9 KH	113
	114
	115	static int __init mod_init(void)
	116	{
	117	register_hdlc_protocol(&proto);
	118	return 0;
	119	}
	120
	121
	122
	123	static void __exit mod_exit(void)
	124	{
	125	unregister_hdlc_protocol(&proto);
	126	}
	127
	128
	129	module_init(mod_init);
	130	module_exit(mod_exit);
	131
	132	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	133	MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
	134	MODULE_LICENSE("GPL v2");