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/errno.h> 26 #include <linux/netdevice.h> 27 #include <linux/net.h> 28 #include <linux/init.h> 29 #include <linux/if_pppox.h> 30 #include <linux/ppp_defs.h> 31 #include <linux/ppp-ioctl.h> 32 #include <linux/ppp_channel.h> 33 #include <linux/kmod.h> 34 35 #include <net/sock.h> 36 37 #include <linux/uaccess.h> 38 39 static const struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1]; 40 41 int register_pppox_proto(int proto_num, const struct pppox_proto *pp) 42 { 43 if (proto_num < 0 || proto_num > PX_MAX_PROTO) 44 return -EINVAL; 45 if (pppox_protos[proto_num]) 46 return -EALREADY; 47 pppox_protos[proto_num] = pp; 48 return 0; 49 } 50 51 void unregister_pppox_proto(int proto_num) 52 { 53 if (proto_num >= 0 && proto_num <= PX_MAX_PROTO) 54 pppox_protos[proto_num] = NULL; 55 } 56 57 void pppox_unbind_sock(struct sock *sk) 58 { 59 /* Clear connection to ppp device, if attached. */ 60 61 if (sk->sk_state & (PPPOX_BOUND | PPPOX_CONNECTED)) { 62 ppp_unregister_channel(&pppox_sk(sk)->chan); 63 sk->sk_state = PPPOX_DEAD; 64 } 65 } 66 67 EXPORT_SYMBOL(register_pppox_proto); 68 EXPORT_SYMBOL(unregister_pppox_proto); 69 EXPORT_SYMBOL(pppox_unbind_sock); 70 71 int pppox_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 72 { 73 struct sock *sk = sock->sk; 74 struct pppox_sock *po = pppox_sk(sk); 75 int rc; 76 77 lock_sock(sk); 78 79 switch (cmd) { 80 case PPPIOCGCHAN: { 81 int index; 82 rc = -ENOTCONN; 83 if (!(sk->sk_state & PPPOX_CONNECTED)) 84 break; 85 86 rc = -EINVAL; 87 index = ppp_channel_index(&po->chan); 88 if (put_user(index , (int __user *) arg)) 89 break; 90 91 rc = 0; 92 sk->sk_state |= PPPOX_BOUND; 93 break; 94 } 95 default: 96 rc = pppox_protos[sk->sk_protocol]->ioctl ? 97 pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY; 98 } 99 100 release_sock(sk); 101 return rc; 102 } 103 104 EXPORT_SYMBOL(pppox_ioctl); 105 106 static int pppox_create(struct net *net, struct socket *sock, int protocol, 107 int kern) 108 { 109 int rc = -EPROTOTYPE; 110 111 if (protocol < 0 || protocol > PX_MAX_PROTO) 112 goto out; 113 114 rc = -EPROTONOSUPPORT; 115 if (!pppox_protos[protocol]) 116 request_module("net-pf-%d-proto-%d", PF_PPPOX, protocol); 117 if (!pppox_protos[protocol] || 118 !try_module_get(pppox_protos[protocol]->owner)) 119 goto out; 120 121 rc = pppox_protos[protocol]->create(net, sock, kern); 122 123 module_put(pppox_protos[protocol]->owner); 124 out: 125 return rc; 126 } 127 128 static const struct net_proto_family pppox_proto_family = { 129 .family = PF_PPPOX, 130 .create = pppox_create, 131 .owner = THIS_MODULE, 132 }; 133 134 static int __init pppox_init(void) 135 { 136 return sock_register(&pppox_proto_family); 137 } 138 139 static void __exit pppox_exit(void) 140 { 141 sock_unregister(PF_PPPOX); 142 } 143 144 module_init(pppox_init); 145 module_exit(pppox_exit); 146 147 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); 148 MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)"); 149 MODULE_LICENSE("GPL"); 150 MODULE_ALIAS_NETPROTO(PF_PPPOX); 151