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 <mostrows@speakeasy.net> 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> 34#include <linux/kmod.h> 35 36#include <net/sock.h> 37 38#include <asm/uaccess.h> 39 40static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1]; 41 42int 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 52void 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 58void pppox_unbind_sock(struct sock *sk) 59{ 60 /* Clear connection to ppp device, if attached. */ 61 62 if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED | PPPOX_ZOMBIE)) { 63 ppp_unregister_channel(&pppox_sk(sk)->chan); 64 sk->sk_state = PPPOX_DEAD; 65 } 66} 67 68EXPORT_SYMBOL(register_pppox_proto); 69EXPORT_SYMBOL(unregister_pppox_proto); 70EXPORT_SYMBOL(pppox_unbind_sock); 71 72int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 73{ 74 struct sock *sk = sock->sk; 75 struct pppox_sock *po = pppox_sk(sk); 76 int rc = 0; 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: 97 if (pppox_protos[sk->sk_protocol]->ioctl) 98 rc = pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, 99 arg); 100 101 break; 102 }; 103 104 release_sock(sk); 105 return rc; 106} 107 108EXPORT_SYMBOL(pppox_ioctl); 109 110static int pppox_create(struct socket *sock, int protocol) 111{ 112 int rc = -EPROTOTYPE; 113 114 if (protocol < 0 || protocol > PX_MAX_PROTO) 115 goto out; 116 117 rc = -EPROTONOSUPPORT; 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 125 if (!pppox_protos[protocol] || 126 !try_module_get(pppox_protos[protocol]->owner)) 127 goto out; 128 129 rc = pppox_protos[protocol]->create(sock); 130 131 module_put(pppox_protos[protocol]->owner); 132out: 133 return rc; 134} 135 136static 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"); 158