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

/*
 * Generic HDLC support routines for Linux
 * Point-to-point protocol 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>
#include <net/syncppp.h>

struct ppp_state {
	struct ppp_device pppdev;
	struct ppp_device *syncppp_ptr;
	int (*old_change_mtu)(struct net_device *dev, int new_mtu);
};

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


static inline struct ppp_state* state(hdlc_device *hdlc)
{
	return(struct ppp_state *)(hdlc->state);
}


static int ppp_open(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	int (*old_ioctl)(struct net_device *, struct ifreq *, int);
	int result;

	dev->priv = &state(hdlc)->syncppp_ptr;
	state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;
	state(hdlc)->pppdev.dev = dev;

	old_ioctl = dev->do_ioctl;
	state(hdlc)->old_change_mtu = dev->change_mtu;
	sppp_attach(&state(hdlc)->pppdev);
	/* sppp_attach nukes them. We don't need syncppp's ioctl */
	dev->do_ioctl = old_ioctl;
	state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO;
	dev->type = ARPHRD_PPP;
	result = sppp_open(dev);
	if (result) {
		sppp_detach(dev);
		return result;
	}

	return 0;
}


static void ppp_close(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);

	sppp_close(dev);
	sppp_detach(dev);

	dev->change_mtu = state(hdlc)->old_change_mtu;
	dev->mtu = HDLC_MAX_MTU;
	dev->hard_header_len = 16;
}


static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
{
	return __constant_htons(ETH_P_WAN_PPP);
}


static struct hdlc_proto proto = {
	.open		= ppp_open,
	.close		= ppp_close,
	.type_trans	= ppp_type_trans,
	.ioctl		= ppp_ioctl,
	.module		= THIS_MODULE,
};


static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
{
	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_PPP;
		return 0; /* return protocol only, no settable parameters */

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

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

		/* no settable parameters */

		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
		if (result)
			return result;

		result = attach_hdlc_protocol(dev, &proto,
					      sizeof(struct ppp_state));
		if (result)
			return result;
		dev->hard_start_xmit = hdlc->xmit;
		dev->type = ARPHRD_PPP;
		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("PPP protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic HDLC support routines for Linux
	3	* Point-to-point protocol 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>
eb2a2fd9 KH	25	#include <net/syncppp.h>
	26
	27	struct ppp_state {
	28	struct ppp_device pppdev;
	29	struct ppp_device *syncppp_ptr;
	30	int (old_change_mtu)(struct net_device dev, int new_mtu);
	31	};
	32
	33	static int ppp_ioctl(struct net_device dev, struct ifreq ifr);
	34
	35
	36	static inline struct ppp_state* state(hdlc_device *hdlc)
	37	{
	38	return(struct ppp_state *)(hdlc->state);
	39	}
1da177e4 LT	40
	41
	42	static int ppp_open(struct net_device *dev)
	43	{
	44	hdlc_device *hdlc = dev_to_hdlc(dev);
90458401	45	int (old_ioctl)(struct net_device , struct ifreq *, int);
1da177e4 LT	46	int result;
1da177e4 LT	47
eb2a2fd9 KH	48	dev->priv = &state(hdlc)->syncppp_ptr;
	49	state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;
	50	state(hdlc)->pppdev.dev = dev;
1da177e4 LT	51
1da177e4 LT	52	old_ioctl = dev->do_ioctl;
eb2a2fd9 KH	53	state(hdlc)->old_change_mtu = dev->change_mtu;
eb2a2fd9 KH	54	sppp_attach(&state(hdlc)->pppdev);
1da177e4 LT	55	/* sppp_attach nukes them. We don't need syncppp's ioctl */
1da177e4 LT	56	dev->do_ioctl = old_ioctl;
eb2a2fd9	57	state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO;
1da177e4 LT	58	dev->type = ARPHRD_PPP;
	59	result = sppp_open(dev);
	60	if (result) {
	61	sppp_detach(dev);
	62	return result;
	63	}
	64
	65	return 0;
	66	}
	67
	68
	69
	70	static void ppp_close(struct net_device *dev)
	71	{
	72	hdlc_device *hdlc = dev_to_hdlc(dev);
	73
	74	sppp_close(dev);
	75	sppp_detach(dev);
3b04ddde	76
eb2a2fd9	77	dev->change_mtu = state(hdlc)->old_change_mtu;
1da177e4 LT	78	dev->mtu = HDLC_MAX_MTU;
	79	dev->hard_header_len = 16;
	80	}
	81
	82
	83
ab611487	84	static __be16 ppp_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	85	{
	86	return __constant_htons(ETH_P_WAN_PPP);
	87	}
	88
	89
	90
eb2a2fd9 KH	91	static struct hdlc_proto proto = {
	92	.open = ppp_open,
	93	.close = ppp_close,
	94	.type_trans = ppp_type_trans,
	95	.ioctl = ppp_ioctl,
	96	.module = THIS_MODULE,
	97	};
	98
	99
	100	static int ppp_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	101	{
	102	hdlc_device *hdlc = dev_to_hdlc(dev);
	103	int result;
	104
	105	switch (ifr->ifr_settings.type) {
	106	case IF_GET_PROTO:
eb2a2fd9 KH	107	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	108	return -EINVAL;
1da177e4 LT	109	ifr->ifr_settings.type = IF_PROTO_PPP;
	110	return 0; /* return protocol only, no settable parameters */
	111
	112	case IF_PROTO_PPP:
	113	if(!capable(CAP_NET_ADMIN))
	114	return -EPERM;
	115
	116	if(dev->flags & IFF_UP)
	117	return -EBUSY;
	118
	119	/* no settable parameters */
	120
	121	result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
	122	if (result)
	123	return result;
	124
40d25142	125	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	126	sizeof(struct ppp_state));
	127	if (result)
	128	return result;
1da177e4	129	dev->hard_start_xmit = hdlc->xmit;
1da177e4	130	dev->type = ARPHRD_PPP;
4bc83b4d	131	netif_dormant_off(dev);
1da177e4 LT	132	return 0;
	133	}
	134
	135	return -EINVAL;
	136	}
eb2a2fd9 KH	137
	138
	139	static int __init mod_init(void)
	140	{
	141	register_hdlc_protocol(&proto);
	142	return 0;
	143	}
	144
	145
	146
	147	static void __exit mod_exit(void)
	148	{
	149	unregister_hdlc_protocol(&proto);
	150	}
	151
	152
	153	module_init(mod_init);
	154	module_exit(mod_exit);
	155
	156	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	157	MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
	158	MODULE_LICENSE("GPL v2");