[deliverable/linux.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/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/etherdevice.h>
#include <linux/hdlc.h>

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

static int 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,
	.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);
	int result;
	int (*old_ch_mtu)(struct net_device *, int);
	int old_qlen;

	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);
		dev->hard_start_xmit = eth_tx;
		old_ch_mtu = dev->change_mtu;
		old_qlen = dev->tx_queue_len;
		ether_setup(dev);
		dev->change_mtu = old_ch_mtu;
		dev->tx_queue_len = old_qlen;
		random_ether_addr(dev->dev_addr);
		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
	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>
1da177e4 LT	21	#include <linux/inetdevice.h>
	22	#include <linux/lapb.h>
	23	#include <linux/rtnetlink.h>
	24	#include <linux/etherdevice.h>
	25	#include <linux/hdlc.h>
	26
eb2a2fd9	27	static int raw_eth_ioctl(struct net_device dev, struct ifreq ifr);
1da177e4 LT	28
	29	static int eth_tx(struct sk_buff skb, struct net_device dev)
	30	{
	31	int pad = ETH_ZLEN - skb->len;
	32	if (pad > 0) { /* Pad the frame with zeros */
	33	int len = skb->len;
	34	if (skb_tailroom(skb) < pad)
	35	if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
198191c4	36	dev->stats.tx_dropped++;
1da177e4 LT	37	dev_kfree_skb(skb);
	38	return 0;
	39	}
	40	skb_put(skb, pad);
	41	memset(skb->data + len, 0, pad);
	42	}
	43	return dev_to_hdlc(dev)->xmit(skb, dev);
	44	}
	45
	46
eb2a2fd9 KH	47	static struct hdlc_proto proto = {
	48	.type_trans = eth_type_trans,
	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);
	60	int result;
90458401	61	int (old_ch_mtu)(struct net_device , int);
1da177e4 LT	62	int old_qlen;
	63
	64	switch (ifr->ifr_settings.type) {
	65	case IF_GET_PROTO:
eb2a2fd9 KH	66	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	67	return -EINVAL;
1da177e4 LT	68	ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
	69	if (ifr->ifr_settings.size < size) {
	70	ifr->ifr_settings.size = size; /* data size wanted */
	71	return -ENOBUFS;
	72	}
eb2a2fd9	73	if (copy_to_user(raw_s, hdlc->state, size))
1da177e4 LT	74	return -EFAULT;
	75	return 0;
	76
	77	case IF_PROTO_HDLC_ETH:
	78	if (!capable(CAP_NET_ADMIN))
	79	return -EPERM;
	80
	81	if (dev->flags & IFF_UP)
	82	return -EBUSY;
	83
	84	if (copy_from_user(&new_settings, raw_s, size))
	85	return -EFAULT;
	86
	87	if (new_settings.encoding == ENCODING_DEFAULT)
	88	new_settings.encoding = ENCODING_NRZ;
	89
	90	if (new_settings.parity == PARITY_DEFAULT)
	91	new_settings.parity = PARITY_CRC16_PR1_CCITT;
	92
	93	result = hdlc->attach(dev, new_settings.encoding,
	94	new_settings.parity);
	95	if (result)
	96	return result;
	97
40d25142	98	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	99	sizeof(raw_hdlc_proto));
	100	if (result)
	101	return result;
	102	memcpy(hdlc->state, &new_settings, size);
1da177e4 LT	103	dev->hard_start_xmit = eth_tx;
	104	old_ch_mtu = dev->change_mtu;
	105	old_qlen = dev->tx_queue_len;
	106	ether_setup(dev);
	107	dev->change_mtu = old_ch_mtu;
	108	dev->tx_queue_len = old_qlen;
47eaa267	109	random_ether_addr(dev->dev_addr);
4bc83b4d	110	netif_dormant_off(dev);
1da177e4 LT	111	return 0;
	112	}
	113
	114	return -EINVAL;
	115	}
eb2a2fd9 KH	116
	117
	118	static int __init mod_init(void)
	119	{
	120	register_hdlc_protocol(&proto);
	121	return 0;
	122	}
	123
	124
	125
	126	static void __exit mod_exit(void)
	127	{
	128	unregister_hdlc_protocol(&proto);
	129	}
	130
	131
	132	module_init(mod_init);
	133	module_exit(mod_exit);
	134
	135	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	136	MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
	137	MODULE_LICENSE("GPL v2");