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158 lines
3.4 KiB
158 lines
3.4 KiB
// 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 <[email protected]> |
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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/compat.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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#ifdef CONFIG_COMPAT |
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int pppox_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
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{ |
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if (cmd == PPPOEIOCSFWD32) |
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cmd = PPPOEIOCSFWD; |
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return pppox_ioctl(sock, cmd, (unsigned long)compat_ptr(arg)); |
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} |
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EXPORT_SYMBOL(pppox_compat_ioctl); |
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#endif |
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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 <[email protected]>"); |
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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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