Linux kernel mirror (for testing)
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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
35#include <net/sock.h>
36
37#include <asm/uaccess.h>
38
39static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
40
41int register_pppox_proto(int proto_num, 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
51void 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
57void pppox_unbind_sock(struct sock *sk)
58{
59 /* Clear connection to ppp device, if attached. */
60
61 if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE)) {
62 ppp_unregister_channel(&pppox_sk(sk)->chan);
63 sk->sk_state = PPPOX_DEAD;
64 }
65}
66
67EXPORT_SYMBOL(register_pppox_proto);
68EXPORT_SYMBOL(unregister_pppox_proto);
69EXPORT_SYMBOL(pppox_unbind_sock);
70
71static int pppox_ioctl(struct socket* sock, unsigned int cmd,
72 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
108
109static int pppox_create(struct socket *sock, int protocol)
110{
111 int rc = -EPROTOTYPE;
112
113 if (protocol < 0 || protocol > PX_MAX_PROTO)
114 goto out;
115
116 rc = -EPROTONOSUPPORT;
117 if (!pppox_protos[protocol] ||
118 !try_module_get(pppox_protos[protocol]->owner))
119 goto out;
120
121 rc = pppox_protos[protocol]->create(sock);
122 if (!rc) {
123 /* We get to set the ioctl handler. */
124 /* For everything else, pppox is just a shell. */
125 sock->ops->ioctl = pppox_ioctl;
126 }
127 module_put(pppox_protos[protocol]->owner);
128out:
129 return rc;
130}
131
132static struct net_proto_family pppox_proto_family = {
133 .family = PF_PPPOX,
134 .create = pppox_create,
135 .owner = THIS_MODULE,
136};
137
138static int __init pppox_init(void)
139{
140 return sock_register(&pppox_proto_family);
141}
142
143static void __exit pppox_exit(void)
144{
145 sock_unregister(PF_PPPOX);
146}
147
148module_init(pppox_init);
149module_exit(pppox_exit);
150
151MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
152MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
153MODULE_LICENSE("GPL");