[linux.git] / drivers / net / pppox.c

/** -*- linux-c -*- ***********************************************************
 * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
 *
 * PPPoX --- Generic PPP encapsulation socket family
 * PPPoE --- PPP over Ethernet (RFC 2516)
 *
 *
 * Version:	0.5.2
 *
 * Author:	Michal Ostrowski <[email protected]>
 *
 * 051000 :	Initialization cleanup
 *
 * License:
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 */

#include <linux/string.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/net.h>
#include <linux/init.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include <linux/ppp_channel.h>
#include <linux/kmod.h>

#include <net/sock.h>

#include <asm/uaccess.h>

static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];

int register_pppox_proto(int proto_num, struct pppox_proto *pp)
{
	if (proto_num < 0 || proto_num > PX_MAX_PROTO)
		return -EINVAL;
	if (pppox_protos[proto_num])
		return -EALREADY;
	pppox_protos[proto_num] = pp;
	return 0;
}

void unregister_pppox_proto(int proto_num)
{
	if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
		pppox_protos[proto_num] = NULL;
}

void pppox_unbind_sock(struct sock *sk)
{
	/* Clear connection to ppp device, if attached. */

	if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED | PPPOX_ZOMBIE)) {
		ppp_unregister_channel(&pppox_sk(sk)->chan);
		sk->sk_state = PPPOX_DEAD;
	}
}

EXPORT_SYMBOL(register_pppox_proto);
EXPORT_SYMBOL(unregister_pppox_proto);
EXPORT_SYMBOL(pppox_unbind_sock);

int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	struct sock *sk = sock->sk;
	struct pppox_sock *po = pppox_sk(sk);
	int rc;

	lock_sock(sk);

	switch (cmd) {
	case PPPIOCGCHAN: {
		int index;
		rc = -ENOTCONN;
		if (!(sk->sk_state & PPPOX_CONNECTED))
			break;

		rc = -EINVAL;
		index = ppp_channel_index(&po->chan);
		if (put_user(index , (int __user *) arg))
			break;

		rc = 0;
		sk->sk_state |= PPPOX_BOUND;
		break;
	}
	default:
		rc = pppox_protos[sk->sk_protocol]->ioctl ?
			pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
	}

	release_sock(sk);
	return rc;
}

EXPORT_SYMBOL(pppox_ioctl);

static int pppox_create(struct net *net, struct socket *sock, int protocol)
{
	int rc = -EPROTOTYPE;

	if (net != &init_net)
		return -EAFNOSUPPORT;

	if (protocol < 0 || protocol > PX_MAX_PROTO)
		goto out;

	rc = -EPROTONOSUPPORT;
#ifdef CONFIG_KMOD
	if (!pppox_protos[protocol]) {
		char buffer[32];
		sprintf(buffer, "pppox-proto-%d", protocol);
		request_module(buffer);
	}
#endif
	if (!pppox_protos[protocol] ||
	    !try_module_get(pppox_protos[protocol]->owner))
		goto out;

	rc = pppox_protos[protocol]->create(net, sock);

	module_put(pppox_protos[protocol]->owner);
out:
	return rc;
}

static struct net_proto_family pppox_proto_family = {
	.family	= PF_PPPOX,
	.create	= pppox_create,
	.owner	= THIS_MODULE,
};

static int __init pppox_init(void)
{
	return sock_register(&pppox_proto_family);
}

static void __exit pppox_exit(void)
{
	sock_unregister(PF_PPPOX);
}

module_init(pppox_init);
module_exit(pppox_exit);

MODULE_AUTHOR("Michal Ostrowski <[email protected]>");
MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/** -- linux-c -- ***********************************************************
	2	* Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
	3	*
	4	* PPPoX --- Generic PPP encapsulation socket family
	5	* PPPoE --- PPP over Ethernet (RFC 2516)
	6	*
	7	*
	8	* Version: 0.5.2
	9	*
	10	* Author: Michal Ostrowski <[email protected]>
	11	*
	12	* 051000 : Initialization cleanup
	13	*
	14	* License:
	15	* This program is free software; you can redistribute it and/or
	16	* modify it under the terms of the GNU General Public License
	17	* as published by the Free Software Foundation; either version
	18	* 2 of the License, or (at your option) any later version.
	19	*
	20	*/
	21
	22	#include <linux/string.h>
	23	#include <linux/module.h>
	24	#include <linux/kernel.h>
	25	#include <linux/slab.h>
	26	#include <linux/errno.h>
	27	#include <linux/netdevice.h>
	28	#include <linux/net.h>
	29	#include <linux/init.h>
	30	#include <linux/if_pppox.h>
	31	#include <linux/ppp_defs.h>
	32	#include <linux/if_ppp.h>
	33	#include <linux/ppp_channel.h>
65def812	34	#include <linux/kmod.h>
1da177e4 LT	35
	36	#include <net/sock.h>
	37
	38	#include <asm/uaccess.h>
	39
	40	static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
	41
	42	int register_pppox_proto(int proto_num, struct pppox_proto *pp)
	43	{
	44	if (proto_num < 0 \|\| proto_num > PX_MAX_PROTO)
	45	return -EINVAL;
	46	if (pppox_protos[proto_num])
	47	return -EALREADY;
	48	pppox_protos[proto_num] = pp;
	49	return 0;
	50	}
	51
	52	void unregister_pppox_proto(int proto_num)
	53	{
	54	if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
	55	pppox_protos[proto_num] = NULL;
	56	}
	57
	58	void pppox_unbind_sock(struct sock *sk)
	59	{
	60	/* Clear connection to ppp device, if attached. */
	61
202a03ac	62	if (sk->sk_state & (PPPOX_BOUND \| PPPOX_CONNECTED \| PPPOX_ZOMBIE)) {
1da177e4 LT	63	ppp_unregister_channel(&pppox_sk(sk)->chan);
	64	sk->sk_state = PPPOX_DEAD;
	65	}
	66	}
	67
	68	EXPORT_SYMBOL(register_pppox_proto);
	69	EXPORT_SYMBOL(unregister_pppox_proto);
	70	EXPORT_SYMBOL(pppox_unbind_sock);
	71
17ba15fb	72	int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1da177e4 LT	73	{
	74	struct sock *sk = sock->sk;
	75	struct pppox_sock *po = pppox_sk(sk);
86c1dcfc	76	int rc;
1da177e4 LT	77
	78	lock_sock(sk);
	79
	80	switch (cmd) {
	81	case PPPIOCGCHAN: {
	82	int index;
	83	rc = -ENOTCONN;
	84	if (!(sk->sk_state & PPPOX_CONNECTED))
	85	break;
	86
	87	rc = -EINVAL;
	88	index = ppp_channel_index(&po->chan);
	89	if (put_user(index , (int __user *) arg))
	90	break;
	91
	92	rc = 0;
	93	sk->sk_state \|= PPPOX_BOUND;
	94	break;
	95	}
	96	default:
86c1dcfc FZ	97	rc = pppox_protos[sk->sk_protocol]->ioctl ?
	98	pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
	99	}
1da177e4 LT	100
	101	release_sock(sk);
	102	return rc;
	103	}
	104
17ba15fb	105	EXPORT_SYMBOL(pppox_ioctl);
1da177e4	106
1b8d7ae4	107	static int pppox_create(struct net net, struct socket sock, int protocol)
1da177e4 LT	108	{
	109	int rc = -EPROTOTYPE;
	110
1b8d7ae4 EB	111	if (net != &init_net)
	112	return -EAFNOSUPPORT;
	113
1da177e4 LT	114	if (protocol < 0 \|\| protocol > PX_MAX_PROTO)
	115	goto out;
	116
	117	rc = -EPROTONOSUPPORT;
65def812 JC	118	#ifdef CONFIG_KMOD
	119	if (!pppox_protos[protocol]) {
	120	char buffer[32];
	121	sprintf(buffer, "pppox-proto-%d", protocol);
	122	request_module(buffer);
	123	}
	124	#endif
1da177e4 LT	125	if (!pppox_protos[protocol] \|\|
	126	!try_module_get(pppox_protos[protocol]->owner))
	127	goto out;
	128
1b8d7ae4	129	rc = pppox_protos[protocol]->create(net, sock);
17ba15fb	130
1da177e4 LT	131	module_put(pppox_protos[protocol]->owner);
	132	out:
	133	return rc;
	134	}
	135
	136	static struct net_proto_family pppox_proto_family = {
	137	.family = PF_PPPOX,
	138	.create = pppox_create,
	139	.owner = THIS_MODULE,
	140	};
	141
	142	static int __init pppox_init(void)
	143	{
	144	return sock_register(&pppox_proto_family);
	145	}
	146
	147	static void __exit pppox_exit(void)
	148	{
	149	sock_unregister(PF_PPPOX);
	150	}
	151
	152	module_init(pppox_init);
	153	module_exit(pppox_exit);
	154
	155	MODULE_AUTHOR("Michal Ostrowski <[email protected]>");
	156	MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
	157	MODULE_LICENSE("GPL");