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1// SPDX-License-Identifier: GPL-2.0-or-later2/** -*- linux-c -*- ***********************************************************3 * Linux PPP over X/Ethernet (PPPoX/PPPoE) Sockets4 *5 * PPPoX --- Generic PPP encapsulation socket family6 * PPPoE --- PPP over Ethernet (RFC 2516)7 *8 * Version: 0.5.29 *10 * Author: Michal Ostrowski <mostrows@speakeasy.net>11 *12 * 051000 : Initialization cleanup13 *14 * License:15 */16 17#include <linux/string.h>18#include <linux/module.h>19#include <linux/kernel.h>20#include <linux/compat.h>21#include <linux/errno.h>22#include <linux/netdevice.h>23#include <linux/net.h>24#include <linux/init.h>25#include <linux/if_pppox.h>26#include <linux/ppp_defs.h>27#include <linux/ppp-ioctl.h>28#include <linux/ppp_channel.h>29#include <linux/kmod.h>30 31#include <net/sock.h>32 33#include <linux/uaccess.h>34 35static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];36 37int register_pppox_proto(int proto_num, const struct pppox_proto *pp)38{39 if (proto_num < 0 || proto_num > PX_MAX_PROTO)40 return -EINVAL;41 if (pppox_protos[proto_num])42 return -EALREADY;43 pppox_protos[proto_num] = pp;44 return 0;45}46 47void unregister_pppox_proto(int proto_num)48{49 if (proto_num >= 0 && proto_num <= PX_MAX_PROTO)50 pppox_protos[proto_num] = NULL;51}52 53void pppox_unbind_sock(struct sock *sk)54{55 /* Clear connection to ppp device, if attached. */56 57 if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) {58 ppp_unregister_channel(&pppox_sk(sk)->chan);59 sk->sk_state = PPPOX_DEAD;60 }61}62 63EXPORT_SYMBOL(register_pppox_proto);64EXPORT_SYMBOL(unregister_pppox_proto);65EXPORT_SYMBOL(pppox_unbind_sock);66 67int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)68{69 struct sock *sk = sock->sk;70 struct pppox_sock *po = pppox_sk(sk);71 int rc;72 73 lock_sock(sk);74 75 switch (cmd) {76 case PPPIOCGCHAN: {77 int index;78 rc = -ENOTCONN;79 if (!(sk->sk_state & PPPOX_CONNECTED))80 break;81 82 rc = -EINVAL;83 index = ppp_channel_index(&po->chan);84 if (put_user(index , (int __user *) arg))85 break;86 87 rc = 0;88 sk->sk_state |= PPPOX_BOUND;89 break;90 }91 default:92 rc = pppox_protos[sk->sk_protocol]->ioctl ?93 pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;94 }95 96 release_sock(sk);97 return rc;98}99 100EXPORT_SYMBOL(pppox_ioctl);101 102#ifdef CONFIG_COMPAT103int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)104{105 if (cmd == PPPOEIOCSFWD32)106 cmd = PPPOEIOCSFWD;107 108 return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));109}110 111EXPORT_SYMBOL(pppox_compat_ioctl);112#endif113 114static int pppox_create(struct net *net, struct socket *sock, int protocol,115 int kern)116{117 int rc = -EPROTOTYPE;118 119 if (protocol < 0 || protocol > PX_MAX_PROTO)120 goto out;121 122 rc = -EPROTONOSUPPORT;123 if (!pppox_protos[protocol])124 request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol);125 if (!pppox_protos[protocol] ||126 !try_module_get(pppox_protos[protocol]->owner))127 goto out;128 129 rc = pppox_protos[protocol]->create(net, sock, kern);130 131 module_put(pppox_protos[protocol]->owner);132out:133 return rc;134}135 136static const struct net_proto_family pppox_proto_family = {137 .family = PF_PPPOX,138 .create = pppox_create,139 .owner = THIS_MODULE,140};141 142static int __init pppox_init(void)143{144 return sock_register(&pppox_proto_family);145}146 147static void __exit pppox_exit(void)148{149 sock_unregister(PF_PPPOX);150}151 152module_init(pppox_init);153module_exit(pppox_exit);154 155MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");156MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");157MODULE_LICENSE("GPL");158MODULE_ALIAS_NETPROTO(PF_PPPOX);159