2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/** -*- linux-c -*- ***********************************************************
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* Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets
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*
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* PPPoX --- Generic PPP encapsulation socket family
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* PPPoE --- PPP over Ethernet (RFC 2516)
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*
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* Version: 0.5.2
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*
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* Author: Michal Ostrowski <mostrows@speakeasy.net>
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*
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* 051000 : Initialization cleanup
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*
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* License:
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*/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/net.h>
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#include <linux/init.h>
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#include <linux/if_pppox.h>
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#include <linux/ppp_defs.h>
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#include <linux/ppp-ioctl.h>
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#include <linux/ppp_channel.h>
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#include <linux/kmod.h>
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#include <net/sock.h>
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#include <linux/uaccess.h>
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static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
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int register_pppox_proto(int proto_num, const struct pppox_proto *pp)
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{
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if (proto_num < 0 || proto_num > PX_MAX_PROTO)
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return -EINVAL;
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if (pppox_protos[proto_num])
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return -EALREADY;
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pppox_protos[proto_num] = pp;
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return 0;
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}
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void unregister_pppox_proto(int proto_num)
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{
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if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)
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pppox_protos[proto_num] = NULL;
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}
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void pppox_unbind_sock(struct sock *sk)
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{
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/* Clear connection to ppp device, if attached. */
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if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) {
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ppp_unregister_channel(&pppox_sk(sk)->chan);
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sk->sk_state = PPPOX_DEAD;
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}
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}
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EXPORT_SYMBOL(register_pppox_proto);
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EXPORT_SYMBOL(unregister_pppox_proto);
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EXPORT_SYMBOL(pppox_unbind_sock);
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int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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{
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struct sock *sk = sock->sk;
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struct pppox_sock *po = pppox_sk(sk);
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int rc;
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lock_sock(sk);
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switch (cmd) {
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case PPPIOCGCHAN: {
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int index;
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rc = -ENOTCONN;
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if (!(sk->sk_state & PPPOX_CONNECTED))
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break;
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rc = -EINVAL;
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index = ppp_channel_index(&po->chan);
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if (put_user(index , (int __user *) arg))
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break;
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rc = 0;
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sk->sk_state |= PPPOX_BOUND;
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break;
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}
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default:
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rc = pppox_protos[sk->sk_protocol]->ioctl ?
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pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
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}
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release_sock(sk);
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return rc;
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}
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EXPORT_SYMBOL(pppox_ioctl);
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static int pppox_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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int rc = -EPROTOTYPE;
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if (protocol < 0 || protocol > PX_MAX_PROTO)
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goto out;
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rc = -EPROTONOSUPPORT;
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if (!pppox_protos[protocol])
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request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol);
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if (!pppox_protos[protocol] ||
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!try_module_get(pppox_protos[protocol]->owner))
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goto out;
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rc = pppox_protos[protocol]->create(net, sock, kern);
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module_put(pppox_protos[protocol]->owner);
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out:
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return rc;
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}
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static const struct net_proto_family pppox_proto_family = {
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.family = PF_PPPOX,
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.create = pppox_create,
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.owner = THIS_MODULE,
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};
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static int __init pppox_init(void)
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{
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return sock_register(&pppox_proto_family);
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}
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static void __exit pppox_exit(void)
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{
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sock_unregister(PF_PPPOX);
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}
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module_init(pppox_init);
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module_exit(pppox_exit);
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MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
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MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NETPROTO(PF_PPPOX);
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