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/** -*- linux-c -*- ***********************************************************
* Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
*
* PPPoX --- Generic PPP encapsulation socket family
* PPPoE --- PPP over Ethernet (RFC 2516)
*
*
* Version: 0.5.1
*
* Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca>
*
* 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 <asm/uaccess.h>
#include <linux/kernel.h>
#include <linux/sched.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 <net/sock.h>
#include <linux/ppp_defs.h>
#include <linux/if_ppp.h>
#include <linux/ppp_channel.h>
static struct pppox_proto *proto[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 (proto[proto_num])
return -EALREADY;
MOD_INC_USE_COUNT;
proto[proto_num] = pp;
return 0;
}
void unregister_pppox_proto(int proto_num)
{
if (proto_num >= 0 && proto_num <= PX_MAX_PROTO) {
proto[proto_num] = NULL;
MOD_DEC_USE_COUNT;
}
}
void pppox_unbind_sock(struct sock *sk)
{
/* Clear connection to ppp device, if attached. */
if (sk->state & PPPOX_BOUND) {
ppp_unregister_channel(&sk->protinfo.pppox->chan);
sk->state &= ~PPPOX_BOUND;
}
}
EXPORT_SYMBOL(register_pppox_proto);
EXPORT_SYMBOL(unregister_pppox_proto);
EXPORT_SYMBOL(pppox_unbind_sock);
static int pppox_ioctl(struct socket* sock, unsigned int cmd,
unsigned long arg)
{
struct sock *sk = sock->sk;
struct pppox_opt *po;
int err = 0;
po = sk->protinfo.pppox;
lock_sock(sk);
switch (cmd) {
case PPPIOCGCHAN:{
int index;
err = -ENOTCONN;
if (!(sk->state & PPPOX_CONNECTED))
break;
err = -EINVAL;
index = ppp_channel_index(&po->chan);
if (put_user(index , (int *) arg))
break;
err = 0;
sk->state |= PPPOX_BOUND;
break;
}
default:
if (proto[sk->protocol]->ioctl)
err = (*proto[sk->protocol]->ioctl)(sock, cmd, arg);
break;
};
release_sock(sk);
return err;
}
static int pppox_create(struct socket *sock, int protocol)
{
int err = 0;
if (protocol < 0 || protocol > PX_MAX_PROTO)
return -EPROTOTYPE;
if (proto[protocol] == NULL)
return -EPROTONOSUPPORT;
err = (*proto[protocol]->create)(sock);
if (err == 0) {
/* We get to set the ioctl handler. */
/* For everything else, pppox is just a shell. */
sock->ops->ioctl = pppox_ioctl;
}
return err;
}
static struct net_proto_family pppox_proto_family = {
PF_PPPOX,
pppox_create
};
static int __init pppox_init(void)
{
int err = 0;
err = sock_register(&pppox_proto_family);
if (err == 0) {
printk(KERN_INFO "Registered PPPoX v0.5\n");
}
return err;
}
static void __exit pppox_exit(void)
{
sock_unregister(PF_PPPOX);
}
module_init(pppox_init);
module_exit(pppox_exit);
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