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
40 static struct pppox_proto *pppox_protos[PX_MAX_PROTO + 1];
41
register_pppox_proto(int proto_num,struct pppox_proto * pp)42 int 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
unregister_pppox_proto(int proto_num)52 void 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
pppox_unbind_sock(struct sock * sk)58 void 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
68 EXPORT_SYMBOL(register_pppox_proto);
69 EXPORT_SYMBOL(unregister_pppox_proto);
70 EXPORT_SYMBOL(pppox_unbind_sock);
71
pppox_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)72 int 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;
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 rc = pppox_protos[sk->sk_protocol]->ioctl ?
98 pppox_protos[sk->sk_protocol]->ioctl(sock, cmd, arg) : -ENOTTY;
99 }
100
101 release_sock(sk);
102 return rc;
103 }
104
105 EXPORT_SYMBOL(pppox_ioctl);
106
pppox_create(struct net * net,struct socket * sock,int protocol)107 static int pppox_create(struct net *net, struct socket *sock, int protocol)
108 {
109 int rc = -EPROTOTYPE;
110
111 if (net != &init_net)
112 return -EAFNOSUPPORT;
113
114 if (protocol < 0 || protocol > PX_MAX_PROTO)
115 goto out;
116
117 rc = -EPROTONOSUPPORT;
118 if (!pppox_protos[protocol])
119 request_module("pppox-proto-%d", protocol);
120 if (!pppox_protos[protocol] ||
121 !try_module_get(pppox_protos[protocol]->owner))
122 goto out;
123
124 rc = pppox_protos[protocol]->create(net, sock);
125
126 module_put(pppox_protos[protocol]->owner);
127 out:
128 return rc;
129 }
130
131 static struct net_proto_family pppox_proto_family = {
132 .family = PF_PPPOX,
133 .create = pppox_create,
134 .owner = THIS_MODULE,
135 };
136
pppox_init(void)137 static int __init pppox_init(void)
138 {
139 return sock_register(&pppox_proto_family);
140 }
141
pppox_exit(void)142 static void __exit pppox_exit(void)
143 {
144 sock_unregister(PF_PPPOX);
145 }
146
147 module_init(pppox_init);
148 module_exit(pppox_exit);
149
150 MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>");
151 MODULE_DESCRIPTION("PPP over Ethernet driver (generic socket layer)");
152 MODULE_LICENSE("GPL");
153