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
register_pppox_proto(int proto_num,const struct pppox_proto * pp)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
unregister_pppox_proto(int proto_num)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
pppox_unbind_sock(struct sock * sk)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
pppox_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)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
pppox_create(struct net * net,struct socket * sock,int protocol,int kern)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
pppox_init(void)134 static int __init pppox_init(void)
135 {
136 return sock_register(&pppox_proto_family);
137 }
138
pppox_exit(void)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
